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WO2025249003A1 - Wireless power supply system, power reception terminal, and power transmitter - Google Patents

Wireless power supply system, power reception terminal, and power transmitter

Info

Publication number
WO2025249003A1
WO2025249003A1 PCT/JP2025/014774 JP2025014774W WO2025249003A1 WO 2025249003 A1 WO2025249003 A1 WO 2025249003A1 JP 2025014774 W JP2025014774 W JP 2025014774W WO 2025249003 A1 WO2025249003 A1 WO 2025249003A1
Authority
WO
WIPO (PCT)
Prior art keywords
power
circuits
power receiving
circuit
coils
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2025/014774
Other languages
French (fr)
Japanese (ja)
Inventor
温 山本
哲也 菱川
真理 竹田
太一 佐々木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Publication of WO2025249003A1 publication Critical patent/WO2025249003A1/en
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/493—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel

Definitions

  • This disclosure generally relates to a wireless power supply system, a power receiving terminal, and a power transmitter, and more specifically to a wireless power supply system, a power receiving terminal, and a power transmitter that include a power transmitter having a power transmission coil and a power receiving terminal having a power receiving coil.
  • Patent Document 1 discloses a wireless power transmission system comprising a power transmission device having a power transmission coil and a power receiving device having a power receiving coil.
  • the power transmission device disclosed in Patent Document 1 transmits AC power contactlessly by electromagnetic induction between the power transmission coil and the power receiving coil.
  • the purpose of this disclosure is to provide a wireless power transfer system, a power receiving terminal, and a power transmitter that can increase the power received by the power receiving terminal and improve power efficiency.
  • a wireless power supply system comprises a power transmitter and a power receiving terminal.
  • the power receiving terminal is supplied with power from the power transmitter.
  • the power transmitter has a plurality of power transmitting coils, a plurality of power transmitting circuits, and a controller.
  • the plurality of power transmitting circuits correspond one-to-one with the plurality of power transmitting coils and supply transmission power to a corresponding one of the plurality of power transmitting coils.
  • the controller controls the plurality of power transmitting circuits.
  • Each of the plurality of power transmitting circuits outputs AC power to a corresponding one of the plurality of power transmitting coils.
  • the power receiving terminal has a plurality of power receiving coils, a plurality of power receiving circuits, and a DC output unit.
  • the plurality of power receiving coils receive AC power from an opposing one of the plurality of power transmitting coils.
  • the plurality of power receiving circuits correspond one-to-one with the plurality of power receiving coils and convert the AC power received by a corresponding one of the plurality of power receiving coils into DC power.
  • the DC output unit includes a first DC output terminal and a second DC output terminal.
  • the first DC output terminal is commonly connected to the high-potential output terminals of the multiple power receiving circuits.
  • the second DC output terminal is commonly connected to the low-potential output terminals of the multiple power receiving circuits.
  • the controller acquires information on the output voltage of each of the multiple power receiving circuits via wireless signals from each of the multiple power receiving circuits, and controls at least one of the frequency and power of the transmission radio waves of each of the multiple power transmitting circuits so that the output voltages of the multiple power receiving circuits are the same.
  • a power receiving terminal is supplied with power by a power transmitter having multiple power transmitting coils.
  • the power receiving terminal includes multiple power receiving coils, multiple power receiving circuits, and a DC output unit.
  • the multiple power receiving circuits correspond one-to-one with the multiple power receiving coils and convert AC power received by a corresponding one of the multiple power receiving coils into DC power.
  • the DC output unit includes a first DC output terminal and a second DC output terminal.
  • the first DC output terminal is commonly connected to the high-potential output terminals of the multiple power receiving circuits.
  • the second DC output terminal is commonly connected to the low-potential output terminals of the multiple power receiving circuits.
  • the power receiving terminal transmits information about the output voltage of each of the multiple power receiving circuits to the power transmitter via a wireless signal from each of the multiple power receiving circuits.
  • a power transmitter wirelessly transmits power to a power receiving terminal.
  • the power transmitter comprises a plurality of power transmitting coils, a plurality of power transmitting circuits, and a controller.
  • the plurality of power transmitting circuits correspond one-to-one with the plurality of power transmitting coils and supply transmission power to a corresponding one of the plurality of power transmitting coils.
  • the controller controls the plurality of power transmitting circuits.
  • Each of the plurality of power transmitting circuits outputs AC power to a corresponding one of the plurality of power transmitting coils.
  • the power receiving terminal comprises a plurality of power receiving coils, a plurality of power receiving circuits, and a DC output unit.
  • the plurality of power receiving coils receive AC power from an opposing one of the plurality of power transmitting coils.
  • the plurality of power receiving circuits correspond one-to-one with the plurality of power receiving coils and convert the AC power received by a corresponding one of the plurality of power receiving coils into DC power.
  • the DC output unit includes a first DC output terminal and a second DC output terminal.
  • the first DC output terminal is commonly connected to the high-potential output terminals of the multiple power receiving circuits.
  • the second DC output terminal is commonly connected to the low-potential output terminals of the multiple power receiving circuits.
  • the controller acquires information on the output voltage of each of the multiple power receiving circuits via wireless signals from each of the multiple power receiving circuits, and controls at least one of the frequency and power of the transmission radio waves of each of the multiple power transmitting circuits so that the output voltages of the multiple power receiving circuits are the same.
  • FIG. 1 is a configuration diagram of a wireless power supply system according to the first embodiment.
  • FIG. 2 is a circuit diagram of a power transmission circuit included in a power transmitter in the wireless power feeding system.
  • FIG. 3 is a circuit diagram of a power receiving circuit included in a power receiving terminal in the wireless power feeding system.
  • FIG. 4 is a schematic exploded perspective view of a power transmitter in the wireless power feeding system.
  • FIG. 5 is a schematic plan view of a housing of a power transmitter and a moving system in the wireless power feeding system.
  • FIG. 6 is a flowchart illustrating the operation of the power transmitter according to the first embodiment.
  • FIG. 7 is a configuration diagram of a wireless power supply system according to the second embodiment.
  • FIG. 1 is a configuration diagram of a wireless power supply system according to the first embodiment.
  • FIG. 2 is a circuit diagram of a power transmission circuit included in a power transmitter in the wireless power feeding system.
  • FIG. 3 is a circuit diagram of a power receiving circuit included
  • FIG. 8 is a configuration diagram of a main part of a power transmitter in the wireless power feeding system.
  • FIG. 9 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system.
  • FIG. 10 is a diagram illustrating the configuration of a main part of a power transmitter in a wireless power feeding system according to the third embodiment.
  • FIG. 11 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system.
  • FIG. 12 is a configuration diagram of a wireless power supply system according to the fourth embodiment.
  • FIG. 13 is a configuration diagram of a main part of a power transmitter in the wireless power feeding system.
  • FIG. 14 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system.
  • FIG. 15 is a diagram illustrating the configuration of a main part of a power transmitter in a wireless power feeding system according to the fifth embodiment.
  • FIG. 16 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system.
  • FIG. 17 is a configuration diagram of a wireless power supply system according to the sixth embodiment.
  • FIG. 18 is a configuration diagram of a main part of a power transmitter in the wireless power feeding system.
  • FIG. 19 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system.
  • FIG. 20 is a configuration diagram of a main part of a power transmitter in a wireless power feeding system according to the seventh embodiment.
  • FIG. 21 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system.
  • FIG. 22 is a configuration diagram of a wireless power feeding system according to the eighth embodiment.
  • FIG. 23 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system.
  • FIG. 24 is a diagram illustrating the configuration of a main part of a power receiving terminal in a wireless power feeding system according to a modified example of the eighth embodiment.
  • FIG. 25 is a configuration diagram of a wireless power supply system according to the ninth embodiment.
  • FIG. 26 is a diagram illustrating the operation of the wireless power feeding system according to the tenth embodiment.
  • FIG. 27 is a diagram illustrating the operation of the wireless power supply system.
  • FIG. 22 is a configuration diagram of a wireless power feeding system according to the eighth embodiment.
  • FIG. 23 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system.
  • FIG. 24 is a
  • FIG. 28 is a characteristic diagram of power efficiency in the wireless power feeding system.
  • FIG. 29 is a configuration diagram of the wireless power supply system.
  • FIG. 30 is a configuration diagram of a wireless power supply system according to a modification of the tenth embodiment.
  • FIG. 31 is a configuration diagram of a wireless power supply system according to the eleventh embodiment.
  • FIG. 32 is a configuration diagram of a wireless power feeding system including the power transmitter according to the first embodiment and a power receiving terminal having only one power receiving coil.
  • FIG. 1 A wireless power supply system 3 according to the first embodiment will be described below with reference to FIGS. 1 to 6.
  • FIG. 1 A wireless power supply system 3 according to the first embodiment will be described below with reference to FIGS. 1 to 6.
  • the wireless power feeding system 3 includes a power transmitter 1 and a power receiving terminal 2.
  • the power receiving terminal 2 is fed with power from the power transmitter 1.
  • the power transmitter 1 includes a plurality of (two in the example of FIG. 1 ) power transmitting coils 10, a plurality of (two in the example of FIG. 1 ) power transmitting circuits 11, and a controller 12.
  • the plurality of power transmitting circuits 11 correspond one-to-one to the plurality of power transmitting coils 10 and supply transmission power to a corresponding one of the plurality of power transmitting coils 10.
  • the controller 12 controls the plurality of power transmitting circuits 11.
  • the power receiving terminal 2 includes a plurality of (two in the example of FIG. 1 ) power receiving coils 20, a plurality of (two in the example of FIG. 1 ) power receiving circuits 21, and a DC output unit 24.
  • the multiple power receiving coils 20 receive AC power from opposing power transmitting coils 10 among the multiple power transmitting coils 10.
  • the multiple power receiving circuits 21 correspond one-to-one to the multiple power receiving coils 20 and convert the AC power received by a corresponding one of the multiple power receiving coils 20 into DC power.
  • the DC output unit 24 includes a first DC output terminal 241 and a second DC output terminal 242.
  • the first DC output terminal 241 is commonly connected to the high-potential output terminals of the multiple power receiving circuits 21.
  • the second DC output terminal 242 is commonly connected to the low-potential output terminals of the multiple power receiving circuits 21.
  • the controller 12 acquires information about the output voltage of each of the multiple power receiving circuits 21 via a wireless signal W2 from each of the multiple power receiving circuits 21 and controls at least one of the frequency and power of the power transmission radio waves of each of the multiple power transmitting circuits 11 so that the output voltages of the multiple power receiving circuits 21 are the same.
  • the above configuration makes it possible to increase the power received by the power receiving terminal 2 and improve power efficiency.
  • the DC output unit 24 is connected to, for example, a battery (e.g., a lithium-ion battery) for storing electrical energy, but is not limited to a battery; for example, a load that operates using electrical energy may also be connected.
  • a battery e.g., a lithium-ion battery
  • a load that operates using electrical energy may also be connected.
  • the power transmitter 1 further includes a power supply circuit 19.
  • the power transmitter 1 wirelessly supplies power to the power receiving terminal 2 placed on the power transmitter 1.
  • the power receiving terminal 2 is, for example, a tablet terminal, a smartphone, or a laptop personal computer.
  • the power transmitter 1 includes two power transmission coils 10 , two power transmission circuits 11 , a power supply circuit 19 , and a controller 12 .
  • Each of the two power transmission coils 10 transmits power to the opposing power receiving coil 20 in a non-contact manner.
  • the two power transmission coils 10 include a first power transmission coil 10a and a second power transmission coil 10b.
  • the two power transmission circuits 11 correspond one-to-one to the two power transmission coils 10.
  • the power transmission coil 10 corresponding to the power transmission circuit 11 is connected between the two output terminals of each of the two power transmission circuits 11.
  • the two power transmission circuits 11 include a first power transmission circuit 11a corresponding to the first power transmission coil 10a and a second power transmission circuit 11b corresponding to the second power transmission coil 10b.
  • Each of the two power transmission circuits 11 includes a DC-AC conversion circuit 110 (see Figure 2) that converts DC power into AC power.
  • the DC-AC conversion circuit 110 includes, for example, a capacitor C11, four switching elements Q11, Q12, Q13, and Q14, and a control circuit 115.
  • the DC-AC conversion circuit 110 can change the frequency of the AC voltage output from the DC-AC conversion circuit 110 and the output power of the DC-AC conversion circuit 110.
  • Capacitor C11 is connected between the output terminals of power supply circuit 19 (see Figure 1).
  • Four switching elements Q11, Q12, Q13, and Q14 are bridge-connected.
  • a series circuit of switching elements Q11 and Q12 and a series circuit of switching elements Q13 and Q14 are connected in parallel to capacitor C11.
  • power transmission coil 10 is connected between the connection point between the two switching elements Q11 and Q12 and the connection point between the two switching elements Q13 and Q14.
  • Each of the four switching elements Q11, Q12, Q13, and Q14 has a control terminal, a first main terminal, and a second main terminal.
  • Each of the four switching elements Q11, Q12, Q13, and Q14 is, for example, a MOSFET. More specifically, each of the four switching elements Q11, Q12, Q13, and Q14 is a normally-off n-channel MOSFET.
  • the control terminal, first main terminal, and second main terminal of each of the four switching elements Q11, Q12, Q13, and Q14 are, respectively, a gate terminal, a drain terminal, and a source terminal.
  • the control terminals of each of the four switching elements Q11, Q12, Q13, and Q14 are connected to the control circuit 115 via different gate drivers.
  • the four diodes connected in anti-parallel to the four switching elements Q11 to Q14 in a one-to-one relationship are parasitic diodes of the n-channel MOSFETs that make up each of the four switching elements Q11 to Q14, but they are not limited to parasitic diodes and may also be external diodes.
  • the power supply circuit 19 supplies a power supply voltage between a pair of input/output terminals of two power transmission circuits 11, for example.
  • the power supply circuit 19 includes, for example, a rectifier circuit connected to a commercial power supply and a step-down chopper circuit connected between the output terminals of the rectifier circuit.
  • the power supply circuit 19 also supplies a power supply voltage to the controller 12.
  • the power supply voltage output from the power supply circuit 19 is 5V, but is not limited to 5V and may be, for example, 10V, 12V, 15V, or 24V.
  • the controller 12 controls the two power transmission circuits 11.
  • the controller 12 has a first communication circuit (not shown) for receiving a wireless signal W2.
  • the controller 12 obtains information on the output voltage of each of the multiple power receiving circuits 21 via the wireless signal W2 from each of the multiple power receiving circuits 21 (two in the example of Figure 1), and controls at least one of the frequency and power of the transmission radio waves of each of the multiple power transmission circuits 11 so that the output voltages of the multiple power receiving circuits 21 are the same.
  • the output voltages of the multiple power receiving circuits 21 are the same does not necessarily mean that the output voltages of the multiple power receiving circuits 21 are strictly the same, but may mean that the output voltage of one power receiving circuit is between 95% and 105% of the output voltages of the remaining power receiving circuits.
  • the multiple power receiving circuits 21 include a first power receiving circuit 21a and a second power receiving circuit 21b, and the wireless signal W2 acquired by the controller 12 from each of the multiple power receiving circuits 21 includes a wireless signal W2a from the first power receiving circuit 21a and a wireless signal W2b from the second power receiving circuit 21b.
  • the controller 12 controls the frequency of the transmitted radio waves, for example, by instructing the control circuit 115 in the DC-AC conversion circuit 110 (see FIG. 2) to change the frequency of the output voltage of the DC-AC conversion circuit 110.
  • the controller 12 also controls the power of the transmitted radio waves, for example, by instructing the control circuit 115 in the DC-AC conversion circuit 110 to change the output power of the DC-AC conversion circuit 110.
  • the controller 12 is configured to be able to switch between a first power transmission mode and a second power transmission mode as the operating mode of the power transmitter 1.
  • the first power transmission mode is a power transmission mode in which multiple (two in the example of Figure 1) coil pairs are used simultaneously between the power transmitter 1 and the power receiving terminal 2, power is transmitted for each coil pair, and the output power of multiple (two in the example of Figure 1) power receiving circuits 21 is combined.
  • a "coil pair” refers to a pair of a power transmitting coil 10 and a power receiving coil 20 that face each other.
  • the multiple coil pairs include, for example, a coil pair of a first power transmitting coil 10a and a first power receiving coil 20a (hereinafter also referred to as the first pair), and a coil pair of a second power transmitting coil 10b and a second power receiving coil 20b (hereinafter also referred to as the second pair).
  • the second power transmission mode is a power transmission mode (second power transmission mode) in which power is transmitted between the power transmitter 1 and the power receiving terminal 2 or the power receiving terminal 2R (see FIG. 32) using one coil pair.
  • the power receiving terminal 2R differs from the power receiving terminal 2 in that it has one power receiving coil 20.
  • the power transmitter 1 can transmit greater power than in the second power transmission mode.
  • the controller 12 includes a computer system.
  • the computer system is primarily composed of a processor and memory as hardware.
  • the functions of the controller 12 in this disclosure are realized by the processor executing a program recorded in the memory of the computer system.
  • the program may be pre-recorded in the memory of the computer system, provided via a telecommunications line, or provided by being recorded on a non-transitory recording medium such as a memory card, optical disk, or hard disk drive that is readable by the computer system.
  • the processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI).
  • IC semiconductor integrated circuit
  • LSI large-scale integrated circuit
  • the integrated circuits such as ICs and LSIs referred to here are called different names depending on the degree of integration, and include integrated circuits called system LSIs, VLSIs (Very Large Scale Integration), or ULSIs (Ultra Large Scale Integration).
  • FPGAs Field-Programmable Gate Arrays
  • FPGAs Field-Programmable Gate Arrays
  • Multiple electronic circuits may be integrated into a single chip, or may be distributed across multiple chips. Multiple chips may be integrated into a single device, or may be distributed across multiple devices.
  • the computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, a microcontroller is also composed of one or more electronic circuits, including semiconductor integrated circuits or large-scale integrated circuits.
  • the power transmitter 1 further includes a housing 40, a movement system 50, and a position detection device 60.
  • the housing 40 houses two power transmission coils 10, two power transmission circuits 11, a controller 12, a power supply circuit 19, and the movement system 50. Note that the two power transmission circuits 11, the controller 12, and the power supply circuit 19 are not shown in FIGS. 4 and 5.
  • the housing 40 is a rectangular box with an opening on one side.
  • an orthogonal coordinate system having three mutually orthogonal axes: the X-axis, the Y-axis, and the Z-axis.
  • the axis along the winding axis direction of the two power transmission coils 10 will be referred to as the "Z-axis.”
  • the X-axis, the Y-axis, and the Z-axis are all imaginary axes, and the arrows indicating "X,” “Y,” and “Z” in the drawings are merely used for the purpose of explanation and do not have any physical substance.
  • Each of the two power transmission coils 10 is a spiral planar coil. When viewed in the Z-axis direction, the outer shape of each of the two power transmission coils 10 is, for example, circular.
  • the movement system 50 is configured to move two power transmission coils 10 independently.
  • the two power transmission coils 10 include a first power transmission coil 10a and a second power transmission coil 10b.
  • the movement system 50 can move the first power transmission coil 10a and the second power transmission coil 10b independently in the X-axis direction and the Y-axis direction, respectively.
  • the movement system 50 has two bases 51, two X-axis rails 52, two Y-axis rails 53, two X-axis drive units 54, two Y-axis drive units 55, and four support bases 56.
  • the two bases 51 correspond one-to-one to the two power transmission coils 10.
  • Each of the two bases 51 holds a corresponding one of the two power transmission coils 10.
  • the outer shape of each of the two bases 51 is, for example, rectangular.
  • Each of the two X-axis rails 52 is arranged along the X-axis direction.
  • Each of the two X-axis rails 52 has an elongated shape such that its length in the X-axis direction is longer than its length in the Y-axis direction.
  • the two X-axis rails 52 (first X-axis rail 52a, second X-axis rail 52b) are spaced apart from each other in the Y-axis direction.
  • Each of the two Y-axis rails 53 is arranged along the Y-axis direction.
  • Each of the two Y-axis rails 53 has an elongated shape with a length in the Y-axis direction greater than its length in the X-axis direction.
  • the two Y-axis rails 53 are spaced apart from each other in the X-axis direction.
  • Each of the two Y-axis rails 53 is movably connected to the two X-axis rails 52.
  • the two X-axis drive units 54 correspond one-to-one to the two Y-axis rails 53.
  • the two X-axis drive units 54 include a first X-axis drive unit 54a and a second X-axis drive unit 54b
  • the two Y-axis rails 53 include a first Y-axis rail 53a corresponding to the first X-axis drive unit 54a and a second Y-axis rail 53b corresponding to the second X-axis drive unit 54b.
  • the first X-axis drive unit 54a is held by the first Y-axis rail 53a.
  • the second X-axis drive unit 54b is held by the second Y-axis rail 53b.
  • the first X-axis drive unit 54a moves the first Y-axis rail 53a along the two X-axis rails 52.
  • the second X-axis drive unit 54b moves the second Y-axis rail 53b along the two X-axis rails 52.
  • the two Y-axis drive units 55 include a first Y-axis drive unit 55a and a second Y-axis drive unit 55b.
  • the first Y-axis drive unit 55a moves the base 51, which is movably connected to the first Y-axis rail 53a, along the first Y-axis rail 53a.
  • the second Y-axis drive unit 55b moves the base 51, which is movably connected to the second Y-axis rail 53b, along the second Y-axis rail 53b.
  • the movement system 50 of this embodiment has multiple rack-and-pinion mechanisms.
  • each of the two X-axis rails 52 is a rack with multiple teeth aligned in the X-axis direction.
  • Each of the two X-axis rails 52 is supported by two support bases 56 fixed to the housing 40.
  • Each of the two X-axis drive units 54 corresponds one-to-one to the two Y-axis rails 53 and is held by the corresponding Y-axis rail 53.
  • Each of the two X-axis drive units 54 includes a pinion (gear) 542 that meshes with the rack that makes up the X-axis rail 52, and a motor 541 that is held by the Y-axis rail 53 and rotates the pinion 542.
  • the pinion 542 is connected to the output shaft of the motor 541.
  • each of the two Y-axis rails 53 has a rack 531 with multiple teeth aligned in the Y-axis direction, and a slider 532 adjacent to the rack 531.
  • the slider 532 holds the base 51 in a slidable manner.
  • Each of the two Y-axis drive units 55 includes a pinion (gear) 552 that meshes with the rack 531, and a motor 551 that is held by the base 51 and rotates the pinion 552.
  • the pinion 552 is connected to the output shaft of the motor 551.
  • the movement system 50 is controlled, for example, by the controller 12.
  • the motor 541 of the first X-axis drive unit 54a, the motor 541 of the second X-axis drive unit 54b, the motor 551 of the first Y-axis drive unit 55a, and the motor 551 of the second Y-axis drive unit 55b are independently controlled by the controller 12.
  • the movement system 50 is not limited to the above example, as long as it can move multiple (two) power transmission coils 10 independently.
  • the position detection device 60 is a device for detecting the position of the receiving coil 20 of the receiving terminal 2 placed on the power transmitter 1. As shown in FIG. 4, the position detection device 60 includes a printed circuit board 63 having a plurality of first search coils 61 (six in the example of FIG. 4) and a plurality of second search coils 62 (four in the example of FIG. 4). The printed circuit board 63 is in the shape of a rectangular plate. The position detection device 60 is attached to the housing 40 so as to close the opening of the housing 40.
  • Each of the multiple first search coils 61 is rectangular in shape.
  • the longitudinal direction of each of the multiple first search coils 61 is along the Y-axis direction.
  • the multiple first search coils 61 are arranged side by side at equal intervals in the X-axis direction.
  • Each of the multiple second search coils 62 is rectangular in shape.
  • the longitudinal direction of each of the multiple second search coils 62 is along the X-axis direction.
  • the multiple second search coils 62 are arranged side by side at equal intervals in the Y-axis direction.
  • the printed circuit board 63 is a double-sided or multilayer printed circuit board, and a first surface on which the multiple first search coils 61 are arranged and a second surface on which the multiple second search coils 62 are arranged are spaced apart in the thickness direction of the printed circuit board 63.
  • the thickness direction of the printed circuit board 63 is along the Z-axis direction.
  • the multiple first search coils 61 and the multiple second search coils 62 intersect (orthogonally) when viewed from the Z-axis direction.
  • the multiple first search coils 61 and the multiple second search coils 62 are connected to, for example, the controller 12.
  • the multiple first search coils 61 are covered with a first resist layer (not shown). If the second surface on which the multiple second search coils 62 are arranged is the second main surface of the printed circuit board 63, the multiple second search coils 62 are covered with a second resist layer (not shown).
  • the controller 12 supplies pulse signals to the multiple first search coils 61 and the multiple second search coils 62.
  • each of the two power receiving coils 20 of the power receiving terminal 2 is excited by a pulse signal and outputs an echo signal to the opposing first search coil 61 of the multiple first search coils 61.
  • the first search coil 61 outputs the received echo signal to the controller 12.
  • the controller 12 calculates the X coordinate of the power receiving coil 20 based on the position information of each of the multiple first search coils 61 stored in advance and the level of the echo signal. For example, the controller 12 determines the X coordinate of the first search coil 61 of the multiple first search coils 61 whose echo signal level is equal to or greater than a predetermined value and is at a local maximum as the X coordinate of the power receiving coil 20.
  • each of the two power receiving coils 20 of the power receiving terminal 2 is excited by a pulse signal and outputs an echo signal to the opposing second search coil 62 of the multiple second search coils 62.
  • the second search coil 62 receives the echo signal and outputs it to the controller 12.
  • the controller 12 calculates the Y coordinate of the power receiving coil 20 based on the position information of each of the multiple second search coils 62 stored in advance and the level of the echo signal. For example, the controller 12 determines the Y coordinate of the second search coil 62 of the multiple second search coils 62 whose echo signal level is equal to or greater than a predetermined value and is at a maximum as the Y coordinate of the power receiving coil 20.
  • the power transmitter 1 is configured to be able to transmit power to two power receiving terminals 2R, each of which has only one power receiving coil 20.
  • Components of the power receiving terminal 2R that are the same as those of the power receiving terminal 2 are designated by the same reference numerals, and descriptions thereof will be omitted.
  • the power receiving terminal 2 has two power receiving coils 20 , two power receiving circuits 21 , and a DC output unit 24 .
  • Each of the multiple (two in the example of Figure 1) receiving coils 20 receives AC power from an opposing one of the multiple (two in the example of Figure 1) transmitting coils 10 through electromagnetic induction or magnetic field resonance.
  • Each of the two receiving coils 20 is a spiral planar coil.
  • the outer shape of each of the two receiving coils 20 is, for example, circular.
  • the two receiving coils 20 include a first receiving coil 20a and a second receiving coil 20b.
  • the two power receiving circuits 21 correspond one-to-one to the two power receiving coils 20.
  • the power receiving coil 20 corresponding to the power receiving circuit 21 is connected between the two input terminals of each of the two power receiving circuits 21.
  • the two power receiving circuits 21 include a first power receiving circuit 21a corresponding to the first power receiving coil 20a and a second power receiving circuit 21b corresponding to the second power receiving coil 20b.
  • Each of the multiple power receiving circuits 21 includes a rectifier circuit 211, as shown in FIG. 3, for example.
  • the rectifier circuit 211 has four switching elements Q21, Q22, Q23, and Q24, a capacitor C21, and a control circuit 215.
  • the four switching elements Q21, Q22, Q23, and Q24 are bridge-connected.
  • a series circuit of switching elements Q21 and Q22 and a series circuit of switching elements Q23 and Q24 are connected in parallel.
  • the receiving coil 20 is connected between the connection point between the two switching elements Q21 and Q22 and the connection point between the two switching elements Q23 and Q24.
  • the capacitor C21 is connected in parallel to the series circuit of switching elements Q23 and Q24 and the series circuit of switching elements Q21 and Q22.
  • Each of the four switching elements Q21, Q22, Q23, and Q24 has a control terminal, a first main terminal, and a second main terminal.
  • Each of the four switching elements Q21, Q22, Q23, and Q24 is, for example, a MOSFET. More specifically, each of the four switching elements Q21, Q22, Q23, and Q24 is a normally-off n-channel MOSFET.
  • the control terminal, first main terminal, and second main terminal of each of the four switching elements Q21, Q22, Q23, and Q24 are, respectively, a gate terminal, a drain terminal, and a source terminal.
  • the control terminals of each of the four switching elements Q21, Q22, Q23, and Q24 are connected to the control circuit 215 via different gate drivers.
  • the four diodes connected in anti-parallel to the four switching elements Q21 to Q24 in a one-to-one relationship are parasitic diodes of the n-channel MOSFETs that make up each of the four switching elements Q21 to Q24, but they are not limited to parasitic diodes and may also be external diodes.
  • the control circuit 215 controls the four switching elements Q21, Q22, Q23, and Q24. In this embodiment, the control circuit 215 controls the four switching elements Q21, Q22, Q23, and Q24 so that the rectifier circuit 211 operates as a synchronous rectifier circuit.
  • Each of the two power receiving circuits 21 further includes a voltage measurement circuit 22 that measures the output voltage of the power receiving circuit 21 (the output voltage of the rectifier circuit 211), and a second communication circuit 26.
  • the voltage measurement circuit 22 includes, for example, a resistive voltage divider circuit.
  • the second communication circuit 26 has an antenna.
  • the second communication circuit 26 also has an RFIC (Radio Frequency Integrated Circuit) connected to the antenna.
  • the second communication circuit 26 is capable of wireless communication with the first communication circuit of the controller 12, and transmits a wireless signal W2 to the first communication circuit of the controller 12.
  • the power receiving terminal 2 has the above-mentioned battery (not shown) connected to the DC output unit 24, and operates using the battery as a power source.
  • step S2 determines whether there is one power receiving coil 20 (step S2). If there is one power receiving coil 20 (step S2: Yes), the controller 12 switches the operating mode to the second power transmission mode (step S3). Note that a case in which there is one power receiving coil 20 occurs when, for example, only one of the two power receiving terminals 2R shown in FIG. 32 (for example, the left power receiving terminal 2R in FIG. 32) is placed on the power transmitter 1.
  • the controller 12 identifies the position (X and Y coordinates) of the receiving coil 20 (step S4), moves the transmitting coil 10 (e.g., the first transmitting coil 10a) closest to the receiving coil 20 of the two transmitting coils 10 to a position facing the receiving coil 20 of the receiving terminal 2R using the moving system 50, and starts transmitting power from the transmitting coil 10 to the receiving coil 20 (step S5).
  • the transmitting coil 10 e.g., the first transmitting coil 10a
  • step S5 if another receiving coil 20 is detected (step S6: Yes), the controller 12 identifies the position of the other receiving coil 20 (step S7), moves the remaining transmitting coil 10 (e.g., the second transmitting coil 10b) of the two transmitting coils 10 to a position facing the other receiving coil 20, and starts transmitting power from the transmitting coil 10 to the receiving coil 20 (step S8).
  • step S8 when power transmission to all (e.g., two) receiving coils 20 is completed (step S9), the operation of the power transmission circuit 11 is terminated.
  • the other power receiving coil 20 is, for example, the power receiving coil 20 of the power receiving terminal 2R on the right side of the power receiving terminals 2R shown in FIG. 32.
  • step S1 determines whether the number of power receiving coils 20 detected in step S1 is multiple (e.g., two) (step S2: No).
  • step S10 determines whether the number of power receiving terminals is one. If the number of power receiving terminals is one (step S10: Yes), the controller 12 switches the operating mode to the first power transmission mode (step S11). On the other hand, if the number of power receiving terminals is not one (step S10: No), the controller 12 proceeds to step S3.
  • step S11 the controller 12 identifies the positions of all (e.g., two) receiving coils 20 (step S12). Then, the controller 12 moves the first transmitting coil 10a using the moving system 50 so that it faces the first receiving coil 20a, and starts transmitting power from the first transmitting coil 10a to the first receiving coil 20a (step S13). Then, the controller 12 moves the second transmitting coil 10b using the moving system 50 so that it faces the second receiving coil 20b, and starts transmitting power from the second transmitting coil 10b to the second receiving coil 20b (step S14). After step S14, when power transmission to all (e.g., two) receiving coils 20 is completed (step S9), the controller 12 ends the operation of the power transmission circuit 11.
  • step S9 when power transmission to all (e.g., two) receiving coils 20 is completed (step S9), the controller 12 ends the operation of the power transmission circuit 11.
  • each of the multiple power transmitting circuits 11 outputs AC power to a corresponding one of the multiple power transmitting coils 10.
  • the power receiving terminal 2 includes multiple power receiving coils 20, multiple power receiving circuits 21, and a DC output unit 24.
  • the DC output unit 24 includes a first DC output terminal 241 and a second DC output terminal 242.
  • the controller 12 acquires information about the output voltage of each of the multiple power receiving circuits 21 via a wireless signal W2 from each of the multiple power receiving circuits 21, and controls at least one of the frequency and power of the power transmission radio waves of each of the multiple power transmitting circuits 11 so that the output voltages of the multiple power receiving circuits 21 are the same.
  • the power transmitter 1 has two power transmitting coils 10
  • the power receiving terminal 2 has two power receiving coils 20, and the received power can be combined at the power receiving terminal 2, making it possible to increase the received power at the power receiving terminal 2.
  • the optimal conditions for the transmitted radio waves differ for each pair of a power transmitting coil and a power receiving coil, and the output voltage of the power receiving circuit connected to the power receiving coil may differ.
  • the power transmitter 1 has multiple power transmitting circuits 11, and the controller 12 controls at least one of the frequency and power of the transmitted radio waves from each of the multiple power transmitting circuits 11 so that the output voltages of the multiple power receiving circuits 21 are the same. This makes it possible to prevent current from flowing between the power receiving circuits 21 due to differences in output voltage between the multiple power receiving circuits 21, thereby improving power efficiency.
  • the power receiving terminal 2 transmits a wireless signal W2 from each of the multiple power receiving circuits 21 to the controller 12.
  • the power receiving terminal 2 is supplied with power by a power transmitter 1 having multiple power transmitting coils 10.
  • the power receiving terminal 2 includes multiple power receiving coils 20, multiple power receiving circuits 21, and a DC output unit 24.
  • the multiple power receiving circuits 21 correspond one-to-one to the multiple power receiving coils 20 and convert AC power received by a corresponding power receiving coil 20 of the multiple power receiving coils 20 into DC power.
  • the DC output unit 24 includes a first DC output terminal 241 and a second DC output terminal 242.
  • the first DC output terminal 241 is commonly connected to the high-potential output terminals of the multiple power receiving circuits 21.
  • the second DC output terminal 242 is commonly connected to the low-potential output terminals of the multiple power receiving circuits 21.
  • the power receiving terminal 2 transmits information about the output voltage of each of the multiple power receiving circuits 21 to the power transmitter 1 via a wireless signal W2 from each of the multiple power receiving circuits 21.
  • the above configuration makes it possible to increase the power received by the power receiving terminal 2 and improve power efficiency.
  • the power transmitter 1 of embodiment 1 wirelessly transmits power to the power receiving terminal 2.
  • the power transmitter 1 includes a plurality of power transmitting coils 10, a plurality of power transmitting circuits 11, and a controller 12.
  • the plurality of power transmitting circuits 11 correspond one-to-one to the plurality of power transmitting coils 10, and supply transmission power to a corresponding one of the plurality of power transmitting coils 10.
  • the controller 12 controls the plurality of power transmitting circuits 11.
  • Each of the plurality of power transmitting circuits 11 outputs AC power to a corresponding one of the plurality of power transmitting coils 10.
  • the power receiving terminal 2 includes a plurality of power receiving coils 20, a plurality of power receiving circuits 21, and a DC output unit 24.
  • the plurality of power receiving coils 20 receive AC power from an opposing one of the plurality of power transmitting coils 10.
  • the multiple power receiving circuits 21 correspond one-to-one to the multiple power receiving coils 20 and convert AC power received by a corresponding one of the multiple power receiving coils 20 into DC power.
  • the DC output unit 24 includes a first DC output terminal 241 and a second DC output terminal 242.
  • the first DC output terminal 241 is commonly connected to the high-potential output terminals of the multiple power receiving circuits 21.
  • the second DC output terminal 242 is commonly connected to the low-potential output terminals of the multiple power receiving circuits 21.
  • the controller 12 acquires information about the output voltage of each of the multiple power receiving circuits 21 via a wireless signal W2 from each of the multiple power receiving circuits 21 and controls at least one of the frequency and power of the transmission radio waves of each of the multiple power transmitting circuits 11 so that the output voltages of the multiple power receiving circuits 21 are the same.
  • the above configuration makes it possible to increase the power received by the power receiving terminal 2 and improve power efficiency.
  • the wireless power feeding system 3A differs from the wireless power feeding system 3 according to the first embodiment in that it includes a power transmitter 1A and a power receiving terminal 2A instead of the power transmitter 1 and the power receiving terminal 2 according to the first embodiment.
  • the power transmitter 1A the same components as those of the power transmitter 1 are denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate.
  • the power receiving terminal 2A the same components as those of the power receiving terminal 2 are denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate.
  • the wireless power supply system 3A is configured to transmit a wireless signal W2 from each of a plurality of (two in the example of FIG. 7) power receiving circuits 21 to a corresponding one of a plurality of (two in the example of FIG. 7) power transmitting circuits 11.
  • Each of the multiple power transmitting circuits 11 further includes a first communication circuit 16 (see FIG. 8).
  • Each of the multiple power receiving circuits 21 further includes a second communication circuit 26 (see FIG. 9).
  • Each first communication circuit 16 has a first antenna.
  • Each second communication circuit 26 has a second antenna.
  • the power receiving terminal 2A transmits a wireless signal W2 from the second communication circuit 26 of each of the multiple power receiving circuits 21 to the first communication circuit 16 of each of the multiple power transmitting circuits 11.
  • the controller 12 acquires information about the output voltage of each of the multiple power receiving circuits 21 from the multiple first communication circuits 16.
  • the controller 12 controls the power of the transmission radio waves by controlling the DC-AC conversion circuit 110 (see FIG. 8) of the power transmitting circuit 11 based on the information about the output voltage of each of the multiple power receiving circuits 21.
  • Each of the multiple power receiving circuits 21 has a voltage measurement circuit 22 (see Figure 9) that measures the output voltage of the power receiving circuit 21.
  • the voltage measurement circuit 22 is, for example, a resistive voltage divider circuit.
  • the second communication circuit 26 transmits a wireless signal W2 to the first communication circuit 16, which includes data on the voltage value measured by the voltage measurement circuit 22 as the output voltage of the power receiving circuit 21.
  • the controller 12 determines, for each receiving coil 20, the transmission power at which the output voltage of the receiving circuit 21 becomes a predetermined value at a predetermined frequency of the power transmission radio wave (hereinafter also referred to as the power transmission frequency), and then starts power transmission. More specifically, the controller 12 executes a first step of determining the transmission power, and a second step of continuing power transmission after the first step.
  • the controller 12 starts power transmission from each power transmission coil 10 with the frequency of the power transmission radio waves set to fi and the transmission power set to Pi.
  • the controller 12 determines that the frequency of the transmission radio waves is f1 and the transmission power is P1, it starts transmission from the first transmission coil 10a.
  • the controller 12 determines that the frequency of the transmission radio waves is f2 and the transmission power is P2, it starts transmission from the second transmission coil 10b.
  • the wireless power feeding system 3A according to the second embodiment makes it possible to increase the received power and improve the power efficiency at the power receiving terminal 2A.
  • each of the multiple power receiving circuits 21 of the power receiving terminal 2A can communicate with a corresponding one of the multiple power transmitting circuits 11.
  • each of the multiple power transmitting circuits 11 includes a DC-AC conversion circuit 110, a voltage measurement circuit 13 (hereinafter also referred to as a first voltage measurement circuit 13), a current measurement circuit 14 (hereinafter also referred to as a first current measurement circuit 14), and a first communication circuit 16.
  • the voltage measurement circuit 13 measures the input voltage of the power transmitting circuit 11.
  • the first current measurement circuit 14 measures the input current of the power transmitting circuit 11.
  • the first voltage measurement circuit 13 includes, for example, a first resistor voltage divider circuit.
  • the first current measurement circuit 14 includes, for example, a first current detection resistor.
  • the first communication circuit 16 has a first antenna.
  • each of the multiple power receiving circuits 21 includes a rectifier circuit 211, a voltage measurement circuit 22 (hereinafter also referred to as the second voltage measurement circuit 22), a current measurement circuit 23 (hereinafter also referred to as the second current measurement circuit 23), and a second communication circuit 26.
  • the voltage measurement circuit 22 measures the output voltage of the power receiving circuit 21.
  • the current measurement circuit 23 measures the output current of the power receiving circuit 21.
  • the second voltage measurement circuit 22 includes, for example, a second resistive voltage divider circuit.
  • the second current measurement circuit 23 includes, for example, a second current detection resistor.
  • the second communication circuit 26 has a second antenna.
  • Each of the multiple power receiving circuits 21 transmits a wireless signal including data on the measured voltage value of the second voltage measuring circuit 22 and data on the measured current value of the second current measuring circuit 23 from the second communication circuit 26 to the first communication circuit 16 of the corresponding power transmitting circuit 11 among the multiple power transmitting circuits 11.
  • the controller 12 calculates the input power using the measured voltage value data obtained from the first voltage measurement circuit 13 and the measured current value data obtained from the first current measurement circuit 14.
  • the controller 12 calculates the output power using the measured voltage value data and measured current value data transmitted from the second communication circuit 26 to the first communication circuit 16.
  • the controller 12 controls the frequency of the transmission radio waves to maximize the power efficiency.
  • the controller 12 determines the frequency at which power efficiency is maximized for each receiving coil 20, and starts power transmission after determining the power at which the output voltage of the receiving circuit 21 becomes a predetermined value. More specifically, the controller 12 executes a first step of determining the frequency of the power transmission radio waves (hereinafter also referred to as the power transmission frequency), a second step of determining the power to be transmitted after the first step, and a third step of continuing power transmission after the second step.
  • the power transmission frequency hereinafter also referred to as the power transmission frequency
  • the controller 12 starts power transmission from each power transmission coil 10 with the frequency of the power transmission radio wave as f i and the transmission power as P i .
  • the controller 12 determines that the frequency of the power transmission radio wave is f 1 and the transmission power is P 1 , it starts power transmission from the first power transmission coil 10 a.
  • the controller 12 determines that the frequency of the power transmission radio wave is f 2 and the transmission power is P 2 , it starts power transmission from the second power transmission coil 10 b.
  • the wireless power feeding system 3A according to the third embodiment can increase the received power and improve the power efficiency at the power receiving terminal 2A.
  • the controller 12 controls the frequency of the power transmission radio waves so as to maximize power efficiency.
  • the wireless power supply system 3A according to embodiment 3 can maximize power efficiency, thereby reducing the power transmission and power consumption.
  • the wireless power feeding system 3B differs from the wireless power feeding system 3A according to the second embodiment in that it includes a power transmitter 1B and a power receiving terminal 2B instead of the power transmitter 1A and the power receiving terminal 2A according to the second embodiment.
  • the power transmitter 1B components similar to those of the power transmitter 1A are denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate.
  • the power receiving terminal 2B components similar to those of the power receiving terminal 2A are denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate.
  • the wireless power supply system 3B differs from the wireless power supply system 3 according to embodiment 1 in that wireless communication is performed between the first power transmission circuit 11a and the first power receiving circuit 21a, and between the second power transmission circuit 11b and the second power receiving circuit 21b.
  • the dashed arrow pointing from the first power receiving coil 20a to the first power transmitting coil 10a indicates a wireless signal W2a containing information about the output voltage of the first power receiving circuit 21a.
  • the dashed arrow pointing from the second power receiving coil 20b to the second power transmitting coil 10b indicates a wireless signal W2b containing information about the output voltage of the second power receiving circuit 21b.
  • each of the multiple power transmission circuits 11 includes a demodulation circuit 17.
  • the demodulation circuit 17 is a circuit for receiving the wireless signal W2 via the corresponding power transmission coil 10. More specifically, the demodulation circuit 17 has a demodulation function for demodulating the wireless signal W2.
  • each of the multiple power receiving circuits 21 includes a modulation circuit 27.
  • the modulation circuit 27 is a circuit for transmitting a wireless signal W2 via the corresponding power receiving coil 20. More specifically, the modulation circuit 27 has a modulation function for modulating the wireless signal W2.
  • the wireless power feeding system 3B according to the fourth embodiment can increase the received power and improve the power efficiency at the power receiving terminal 2B.
  • the wireless power supply system 3B allows each of the multiple power transmitting coils 10 and the multiple power receiving coils 20 to also serve as a communication antenna.
  • each of the multiple power transmitting circuits 11 includes a DC-AC conversion circuit 110, a voltage measurement circuit 13 (hereinafter also referred to as a first voltage measurement circuit 13), a current measurement circuit 14 (hereinafter also referred to as a first current measurement circuit 14), and a demodulation circuit 17.
  • the voltage measurement circuit 13 measures the input voltage of the power transmitting circuit 11.
  • the first current measurement circuit 14 measures the input current of the power transmitting circuit 11.
  • the first voltage measurement circuit 13 includes, for example, a first resistor voltage divider circuit.
  • the first current measurement circuit 14 includes, for example, a first current detection resistor.
  • each of the multiple power receiving circuits 21 includes a rectifier circuit 211, a voltage measurement circuit 22 (hereinafter also referred to as the second voltage measurement circuit 22), a current measurement circuit 23 (hereinafter also referred to as the second current measurement circuit 23), and a modulation circuit 27.
  • the voltage measurement circuit 22 measures the output voltage of the power receiving circuit 21.
  • the current measurement circuit 23 measures the output current of the power receiving circuit 21.
  • the second voltage measurement circuit 22 includes, for example, a second resistive voltage divider circuit.
  • the second current measurement circuit 23 includes, for example, a second current detection resistor.
  • Each of the multiple power receiving circuits 21 transmits a wireless signal W2 containing data on the measured voltage value of the second voltage measuring circuit 22 and data on the measured current value of the second current measuring circuit 23 from the modulation circuit 27 to the demodulation circuit 17 of the corresponding power transmitting circuit 11 among the multiple power transmitting circuits 11.
  • the controller 12 calculates the input power to the power transmission circuit 11 using the measured voltage value data obtained from the first voltage measurement circuit 13 and the measured current value data obtained from the first current measurement circuit 14.
  • the controller 12 calculates the output power of the power receiving circuit 21 using the measured voltage value data and measured current value data sent from the modulation circuit 27 to the demodulation circuit 17.
  • the controller 12 controls the frequency of the power transmission radio waves to maximize power efficiency.
  • the wireless power feeding system 3B according to the fifth embodiment can increase the received power and improve the power efficiency at the power receiving terminal 2B.
  • the controller 12 controls the frequency of the power transmission radio waves to maximize power efficiency.
  • the wireless power feeding system 3B according to embodiment 5 can maximize power efficiency, thereby reducing the power transmission and power consumption.
  • the wireless power supply system 3C differs from the wireless power supply system 3 according to the first embodiment in that the wireless power supply system 3C includes a power transmitter 1C and a power receiving terminal 2C instead of the power transmitter 1 and the power receiving terminal 2 according to the first embodiment.
  • the power transmitter 1C has multiple (two in the example of Figure 17) power transmission coils 10, multiple (two in the example of Figure 17) power transmission circuits 11, a controller 12, a power supply circuit 19, and a first communication circuit 16.
  • the first communication circuit 16 has a first antenna.
  • the power receiving terminal 2C has multiple (two in the example of Figure 17) power receiving coils 20, multiple (two in the example of Figure 17) power receiving circuits 21, and a second communication circuit 26.
  • the second communication circuit 26 has a second antenna.
  • the second communication circuit 26 acquires the measured output voltage of each of the multiple power receiving circuits 21 from the voltage measurement circuit 22 of each of the power receiving circuits 21, and transmits a wireless signal W2 containing information about the output voltage of each of the power receiving circuits 21 to the first communication circuit 16.
  • the controller 12 obtains information about the output voltage of each power receiving circuit 21 from the first communication circuit 16 and controls each power transmitting circuit 11.
  • the wireless power feeding system 3C according to the sixth embodiment can increase the received power and improve the power efficiency at the power receiving terminal 2C.
  • the wireless power supply system 3C only requires one first communication circuit 16 and one second communication circuit 26, which makes it possible to reduce the size and cost of the power transmitter 1C and the power receiving terminal 2C.
  • each of the multiple power transmitting circuits 11 includes a DC-AC conversion circuit 110, a voltage measurement circuit 13 (hereinafter also referred to as a first voltage measurement circuit 13), and a current measurement circuit 14 (hereinafter also referred to as a first current measurement circuit 14), as shown in Fig. 20.
  • the voltage measurement circuit 13 measures the input voltage of the power transmitting circuit 11.
  • the first current measurement circuit 14 measures the input current of the power transmitting circuit 11.
  • the first voltage measurement circuit 13 includes, for example, a first resistor voltage divider circuit.
  • the first current measurement circuit 14 includes, for example, a first current detection resistor.
  • each of the multiple power receiving circuits 21 includes a rectifier circuit 211, a voltage measurement circuit 22 (hereinafter also referred to as a second voltage measurement circuit 22), and a current measurement circuit 23 (hereinafter also referred to as a second current measurement circuit 23).
  • the voltage measurement circuit 22 measures the output voltage of the power receiving circuit 21.
  • the current measurement circuit 23 measures the output current of the power receiving circuit 21.
  • the second voltage measurement circuit 22 includes, for example, a second resistive voltage divider circuit.
  • the second current measurement circuit 23 includes, for example, a second current detection resistor.
  • the power receiving terminal 2C transmits a wireless signal W2 from the second communication circuit 26 to the first communication circuit 16, the wireless signal W2 including data on the measured voltage value from the second voltage measurement circuit 22 and data on the measured current value from the second current measurement circuit 23.
  • the controller 12 calculates the input power using the measured voltage value data obtained from the first voltage measurement circuit 13 and the measured current value data obtained from the first current measurement circuit 14.
  • the controller 12 calculates the output power using the measured voltage value data and measured current value data transmitted from the second communication circuit 26 to the first communication circuit 16.
  • the controller 12 controls the frequency of the transmission radio waves to maximize the power efficiency.
  • the wireless power feeding system 3C according to the seventh embodiment makes it possible to increase the received power and improve the power efficiency at the power receiving terminal 2C.
  • the controller 12 controls the frequency of the power transmission radio waves to maximize power efficiency.
  • the wireless power feeding system 3C according to embodiment 7 can maximize power efficiency, thereby reducing the power transmission and power consumption.
  • a wireless power feeding system 3D differs from the wireless power feeding system 3 according to the first embodiment in that a power receiving terminal 2D is provided instead of the power receiving terminal 2 according to the first embodiment.
  • the power receiving terminal 2D differs from the power receiving terminal 2 in that it further includes multiple (two in FIG. 22) diode circuits 25 that correspond one-to-one to multiple (two in FIG. 22) power receiving circuits 21.
  • each of the multiple diode circuits 25 has a first diode D25 whose anode is connected to the high-potential output terminal of the power receiving circuit 21, and a second diode D26 whose cathode is connected to the low-potential output terminal of the power receiving circuit 21.
  • the cathode of the first diode D25 is connected to the first DC output terminal 241 (see FIG. 22).
  • the anode of the second diode D26 is connected to the second DC output terminal 242 (see FIG. 22).
  • the wireless power feeding system 3D according to the eighth embodiment can increase the received power and improve the power efficiency at the power receiving terminal 2D.
  • the wireless power supply system 3D according to embodiment 8 includes multiple diode circuits 25, so that backflow between multiple power receiving circuits 21 can be prevented even if the controllability of the multiple power transmitting circuits 11 by the controller 12 decreases.
  • Each of the plurality of diode circuits 25 is not limited to the example of FIG. 23, and may be configured to include only a first diode D25, as shown in FIG. 24, for example.
  • a wireless power feeding system 3E differs from the wireless power feeding system 3 according to the first embodiment in that a power receiving terminal 2E is provided instead of the power receiving terminal 2 according to the first embodiment.
  • the power receiving terminal 2E differs from the power receiving terminal 2 in that it further has multiple (two in FIG. 25) voltage adjustment circuits 28 that correspond one-to-one to multiple (two in FIG. 25) power receiving circuits 21.
  • the two voltage adjustment circuits 28 include a first voltage adjustment circuit 28a and a second voltage adjustment circuit 28b.
  • the first voltage adjustment circuit 28a is connected between the output terminals of the first power receiving circuit 21a and the DC output unit 24.
  • the second voltage adjustment circuit 28b is connected between the output terminals of the second power receiving circuit 21b and the DC output unit 24.
  • Each of the multiple voltage adjustment circuits 28 is, for example, a DC-DC converter.
  • the wireless power feeding system 3E according to the ninth embodiment can increase the received power and improve the power efficiency at the power receiving terminal 2E.
  • the wireless power supply system 3E includes multiple voltage adjustment circuits 28, so that backflow between multiple power receiving circuits 21 can be prevented even if the controllability of the multiple power transmitting circuits 11 by the controller 12 decreases.
  • the controller 12 when the controller 12 controls the movement system 50 to move the transmitting coil 10 to a position facing the receiving coil 20, the controller 12 is configured to perform control to align the winding axis B10 of the transmitting coil 10 with the winding axis B20 of the receiving coil 20, as shown in FIG. 26, and control to misalign the winding axis B10 of the transmitting coil 10 with the winding axis B20 of the receiving coil 20, as shown in FIG. 27.
  • FIG. 28 shows the relationship between the misalignment/coil radius between the transmitting coil 10 and the receiving coil 20 normalized by the coil radius, and power efficiency.
  • the coil radius is the radius of each of the transmitting coil 10 and the receiving coil 20.
  • the controller 12 can change the power efficiency by changing the misalignment.
  • the controller 12 shifts the position of the power transmitting coil 10 relative to the power receiving coil 20 connected to the power receiving circuit 21 with the higher output voltage so that the output voltage of the first power receiving circuit 21a and the output voltage of the second power receiving circuit 21b are the same, thereby weakening the coupling between the power transmitting coil 10 and the power receiving coil 20.
  • the movement system 50 of the power transmitter 1 of embodiment 1 is depicted as two movement mechanisms 18.
  • the two movement mechanisms 18 include a first movement mechanism 18a that moves the first power transmission coil 10a and a second movement mechanism 18b that moves the second power transmission coil 10b.
  • a power transmitter 1G configured with one power transmission circuit 11 distributing power to two power transmission coils 10, such as the modified wireless power supply system 3G shown in Figure 30, where the frequency and power cannot be changed for each power transmission coil 10, it is possible to adjust the output voltages of the two power receiving circuits 21 to be the same by changing the power efficiency through positional control. This makes it possible to prevent backflow between multiple power receiving circuits 21.
  • the wireless power supply system 3H differs from the wireless power supply system 3C according to the seventh embodiment in that the second communication circuit 26 is configured to wirelessly transmit the number of the power receiving coils 20 of the power receiving terminal 2C to the first communication circuit 16 by wireless signal.
  • step S10 is not required in the operation (control algorithm) of the controller 12 described in the flowchart of Fig. 6 above, the control algorithm is simplified, and it is possible to shorten the time until charging of the battery of the power receiving terminal 2C starts.
  • the power receiving terminal 2R shown in Fig. 32 above may be configured to wirelessly transmit a wireless signal W2 including information on the number of power receiving coils 20 and the output voltage of the power receiving circuit 21 from the second communication circuit 26 to the first communication circuit 16 of the power transmitter 1C.
  • the above-described first to eleventh embodiments are merely examples of various embodiments of the present disclosure.
  • the above-described first to eleventh embodiments can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved.
  • the rectifier circuit 211 of the power receiving terminal 2 may be a full-wave rectifier circuit in which four diodes are bridge-connected, or a half-wave rectifier circuit.
  • a wireless power supply system (3; 3A; 3B; 3C; 3D; 3E; 3F; 3G; 3H) includes a power transmitter (1; 1A; 1B; 1C; 1F; 1G) and a power receiving terminal (2; 2A; 2B; 2C; 2D; 2E).
  • the power receiving terminal (2; 2A; 2B; 2C; 2D; 2E) is supplied with power from the power transmitter (1; 1A; 1B; 1C; 1F; 1G).
  • the power transmitter (1; 1A; 1B; 1C; 1F; 1G) includes a plurality of power transmitting coils (10), a plurality of power transmitting circuits (11), and a controller (12).
  • the plurality of power transmitting circuits (11) correspond one-to-one to the plurality of power transmitting coils (10), and supply transmission power to a corresponding one of the plurality of power transmitting coils (10).
  • the controller (12) controls the multiple power transmission circuits (11).
  • Each of the multiple power transmission circuits (11) outputs AC power to a corresponding one of the multiple power transmission coils (10).
  • the power receiving terminal (2) has multiple power receiving coils (20), multiple power receiving circuits (21), and a DC output unit (24).
  • the multiple power receiving coils (20) receive AC power from an opposing one of the multiple power transmission coils (10).
  • the multiple power receiving circuits (21) correspond one-to-one to the multiple power receiving coils (20) and convert AC power received by a corresponding one of the multiple power receiving coils (20) into DC power.
  • the DC output unit (24) includes a first DC output terminal (241) and a second DC output terminal (242).
  • the first DC output terminal (241) is commonly connected to the high-potential output terminals of the multiple power receiving circuits (21).
  • the second DC output terminal (242) is commonly connected to the low-potential output terminals of the multiple power receiving circuits (21).
  • the controller (12) acquires information on the output voltage of each of the multiple power receiving circuits (21) via wireless signals (W2) from each of the multiple power receiving circuits (21), and controls at least one of the frequency and power of the transmission radio waves of each of the multiple power transmitting circuits (11) so that the output voltages of the multiple power receiving circuits (21) are the same.
  • This aspect makes it possible to increase the power received by the power receiving terminals (2; 2A; 2B; 2C; 2D; 2E) and improve power efficiency.
  • the power receiving terminal (2) transmits a wireless signal (W2) from each of the multiple power receiving circuits (21) to the controller (12).
  • each of the multiple power transmission circuits (11) there is no need for each of the multiple power transmission circuits (11) to receive a wireless signal (W2), making it possible to reduce the size and weight of the power transmitter (1).
  • each of the multiple power transmission circuits (11) further includes a first communication circuit (16).
  • Each of the multiple power reception circuits (21) further includes a second communication circuit (26).
  • the power receiving terminal (2A) transmits a wireless signal (W2) from the second communication circuit (26) of each of the multiple power reception circuits (21) to the first communication circuit (16) of each of the multiple power transmission circuits (11).
  • the controller (12) acquires information on the output voltage of each of the multiple power reception circuits (21) from the first communication circuit (16) of each of the multiple power transmission circuits (11).
  • each of the multiple power receiving circuits (21) of the power receiving terminal (2A) can communicate with a corresponding power transmitting circuit (11) among the multiple power transmitting circuits (11).
  • each of the multiple power transmission circuits (11) further includes a first voltage measurement circuit (13), a first current measurement circuit (14), and a first communication circuit (16).
  • the first voltage measurement circuit (13) measures the input voltage of the power transmission circuit (11).
  • the first current measurement circuit (14) measures the input current of the power transmission circuit (11).
  • Each of the multiple power receiving circuits (21) further includes a second voltage measurement circuit (22), a second current measurement circuit (23), and a second communication circuit (26).
  • the second voltage measurement circuit (22) measures the output voltage of the power receiving circuit (21).
  • the second current measurement circuit (23) measures the output current of the power receiving circuit (21).
  • Each of the multiple power receiving circuits (21) transmits a wireless signal (W2) including measured voltage value data from the second voltage measurement circuit (22) and measured current value data from the second current measurement circuit (23) to the first communication circuit (16) of a corresponding one of the multiple power transmitting circuits (11) from the second communication circuit (26).
  • the controller (12) calculates the transmitted power using the measured voltage value data acquired from the first voltage measurement circuit (13) and the measured current value data acquired from the first current measurement circuit (14).
  • the controller (12) calculates the received power using the measured voltage value data and measured current value data transmitted from the second communication circuit (26) to the first communication circuit (16).
  • the controller (12) calculates the power efficiency using the transmitted power and received power.
  • the controller (12) controls the frequency of the transmitted radio waves to maximize power efficiency.
  • This aspect maximizes power efficiency, reducing transmission power and lowering power consumption.
  • each of the multiple power receiving circuits (21) includes a modulation circuit (27) for transmitting a wireless signal (W2) via a corresponding one of the multiple power receiving coils (20).
  • Each of the multiple power transmitting circuits (11) includes a demodulation circuit (17) for receiving the wireless signal (W2) via a corresponding one of the multiple power transmitting coils (10).
  • each of the multiple power transmitting coils (10) and multiple power receiving coils (20) can also be used as a communication antenna.
  • each of the multiple power transmission circuits (11) further includes a first voltage measurement circuit (13) and a first current measurement circuit (14).
  • the first voltage measurement circuit (13) measures the input voltage of the power transmission circuit (11).
  • the first current measurement circuit (14) measures the input current of the power transmission circuit (11).
  • Each of the multiple power receiving circuits (21) further includes a second voltage measurement circuit (22) and a second current measurement circuit (23).
  • the second voltage measurement circuit (22) measures the output voltage of the power receiving circuit (21).
  • the second current measurement circuit (23) measures the output current of the power receiving circuit (21).
  • Each of the multiple power receiving circuits (21) transmits a wireless signal (W2) from the modulation circuit (27) to the demodulation circuit (17) of a corresponding one of the multiple power transmission circuits (11).
  • the wireless signal (W2) includes measured voltage value data from the second voltage measurement circuit (22) and measured current value data from the second current measurement circuit (23).
  • the controller (12) calculates input power using the measured voltage value data acquired from the first voltage measurement circuit (13) and the measured current value data acquired from the first current measurement circuit (14).
  • the controller (12) calculates output power using the measured voltage value data and measured current value data transmitted from the modulation circuit (27) to the demodulation circuit (17).
  • the controller (12) calculates power efficiency using the input power and output power, and controls the frequency of the transmission radio waves to maximize power efficiency.
  • This aspect maximizes power efficiency, reducing transmission power and lowering power consumption.
  • the power receiving terminal (2; 2A; 2B; 2C; 2D; 2E) according to the seventh aspect is supplied with power by a power transmitter (1; 1A; 1B; 1C; 1F; 1G) having a plurality of power transmitting coils (10).
  • the power receiving terminal (2; 2A; 2B; 2C; 2D; 2E) includes a plurality of power receiving coils (20), a plurality of power receiving circuits (21), and a DC output unit (24).
  • the plurality of power receiving circuits (21) correspond one-to-one to the plurality of power receiving coils (20), and convert AC power received by a corresponding power receiving coil (20) among the plurality of power receiving coils (20) into DC power.
  • the DC output unit (24) includes a first DC output terminal (241) and a second DC output terminal (242).
  • the first DC output terminal (241) is commonly connected to the high-potential output terminals of the plurality of power receiving circuits (21).
  • the second DC output terminal (242) is a power receiving terminal (2; 2A; 2B; 2C; 2D; 2E) to which the low-potential output terminals of the multiple power receiving circuits (21) are commonly connected, and transmits information about the output voltage of each of the multiple power receiving circuits (21) to the power transmitter (1; 1A; 1B; 1C; 1F; 1G) via a wireless signal (W2) from each of the multiple power receiving circuits (21).
  • This aspect makes it possible to increase the power received by the power receiving terminals (2; 2A; 2B; 2C; 2D; 2E) and improve power efficiency.
  • a power transmitter (1; 1A; 1B; 1C; 1F; 1G) wirelessly transmits power to a power receiving terminal (2; 2A; 2B; 2C; 2D; 2E).
  • the power transmitter (1; 1A; 1B; 1C; 1F; 1G) includes a plurality of power transmission coils (10), a plurality of power transmission circuits (11), and a controller (12).
  • the plurality of power transmission circuits (11) correspond one-to-one to the plurality of power transmission coils (10), and supply transmission power to a corresponding one of the plurality of power transmission coils (10).
  • the controller (12) controls the plurality of power transmission circuits (11).
  • Each of the plurality of power transmission circuits (11) outputs AC power to a corresponding one of the plurality of power transmission coils (10).
  • the power receiving terminal (2; 2A; 2B; 2C; 2D; 2E) includes a plurality of power receiving coils (20), a plurality of power receiving circuits (21), and a DC output unit (24).
  • the plurality of power receiving coils (20) receive AC power from opposing power transmitting coils (10) among the plurality of power transmitting coils (10).
  • the plurality of power receiving circuits (21) correspond one-to-one to the plurality of power receiving coils (20) and convert AC power received by a corresponding power receiving coil (20) among the plurality of power receiving coils (20) into DC power.
  • the DC output unit (24) includes a first DC output terminal (241) and a second DC output terminal (242).
  • the first DC output terminal (241) is commonly connected to the high-potential side output terminals of the plurality of power receiving circuits (21).
  • the second DC output terminal (242) is commonly connected to the low-potential output terminals of the multiple power receiving circuits (21).
  • the controller (12) acquires information on the output voltage of each of the multiple power receiving circuits (21) via a wireless signal (W2) from each of the multiple power receiving circuits (21), and controls at least one of the frequency and power of the transmission radio waves of each of the multiple power transmitting circuits (11) so that the output voltages of the multiple power receiving circuits (21) are the same.
  • W2 wireless signal
  • This aspect makes it possible to increase the power received by the power receiving terminals (2; 2A; 2B; 2C; 2D; 2E) and improve power efficiency.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention increases transmission power and improves power efficiency. Each of a plurality of power transmission circuits (11) outputs AC power to a corresponding power transmission coil (10) among a plurality of power transmission coils (10). A power reception terminal (2) comprises: a plurality of power reception coils (20); a plurality of power reception circuits (21); and a DC output unit (24). Each of the plurality of power reception circuits (21) converts, into DC power, the AC power received by a corresponding power reception coil (20) among the plurality of power reception coils (20). The DC output unit (24) includes a first DC output terminal (241) and a second DC output terminal (242). A controller (12) acquires information on the output voltage of each of the plurality of power reception circuits (21) by means of a wireless signal (W2) from the power reception circuit (21), and controls at least one of the frequency and the power of a power transmission wave of each of the plurality of power transmission circuits (11) so that the output voltages of the plurality of power reception circuits (21) become the same.

Description

無線給電システム、受電端末、及び、送電器Wireless power supply system, power receiving terminal, and power transmitter

　本開示は、一般に無線給電システム、受電端末、及び、送電器に関し、より詳細には、送電コイルを有する送電器と受電コイルを有する受電端末とを備える無線給電システム、受電端末、及び、送電器に関する。 This disclosure generally relates to a wireless power supply system, a power receiving terminal, and a power transmitter, and more specifically to a wireless power supply system, a power receiving terminal, and a power transmitter that include a power transmitter having a power transmission coil and a power receiving terminal having a power receiving coil.

　特許文献１は、送電コイルを有する送電装置と、受電コイルを有する受電装置と、を備える無線電力伝送システムを開示している。特許文献１に開示された送電装置は、送電コイル及び受電コイル間の電磁誘導によって非接触で交流電力を送る。 Patent Document 1 discloses a wireless power transmission system comprising a power transmission device having a power transmission coil and a power receiving device having a power receiving coil. The power transmission device disclosed in Patent Document 1 transmits AC power contactlessly by electromagnetic induction between the power transmission coil and the power receiving coil.

　特許文献１に開示された無線電力伝送システムでは、受電端末の受電電力の大電力化が難しい場合がある。また、特許文献１に開示された無線電力伝送システムでは、電力効率が低下する場合がある。 In the wireless power transmission system disclosed in Patent Document 1, it may be difficult to increase the power received by the power receiving terminal. Furthermore, in the wireless power transmission system disclosed in Patent Document 1, power efficiency may decrease.

特開２０１５－１１１９９６号公報JP 2015-111996 A

　本開示の目的は、受電端末での受電電力の大電力化及び電力効率の向上を図ることが可能な無線給電システム、受電端末、及び、送電器を提供することにある。 The purpose of this disclosure is to provide a wireless power transfer system, a power receiving terminal, and a power transmitter that can increase the power received by the power receiving terminal and improve power efficiency.

　本開示に係る一態様の無線給電システムは、送電器と、受電端末と、を備える。前記受電端末は、前記送電器から給電される。前記送電器は、複数の送電コイルと、複数の送電回路と、コントローラと、を有する。前記複数の送電回路は、前記複数の送電コイルと一対一に対応し、前記複数の送電コイルのうち対応する送電コイルに送電電力を供給する。前記コントローラは、前記複数の送電回路を制御する。前記複数の送電回路の各々は、前記複数の送電コイルのうち対応する送電コイルへ交流電力を出力する。前記受電端末は、複数の受電コイルと、複数の受電回路と、直流出力部と、を有する。前記複数の受電コイルは、前記複数の送電コイルのうち対向する送電コイルから交流電力を受電する。前記複数の受電回路は、前記複数の受電コイルと一対一に対応し、前記複数の受電コイルのうち対応する受電コイルにより受電した交流電力を直流電力に変換する。前記直流出力部は、第１直流出力端子及び第２直流出力端子を含む。前記第１直流出力端子は、前記複数の受電回路それぞれの高電位側の出力端が共通接続される。前記第２直流出力端子は、前記複数の受電回路それぞれの低電位側の出力端が共通接続される。前記コントローラは、前記複数の受電回路それぞれの出力電圧の情報を前記複数の受電回路それぞれからの無線信号により取得し、前記複数の受電回路の互いの出力電圧が同じになるように、前記複数の送電回路の各々の送電電波の周波数と電力との少なくとも一方を制御する。 A wireless power supply system according to one aspect of the present disclosure comprises a power transmitter and a power receiving terminal. The power receiving terminal is supplied with power from the power transmitter. The power transmitter has a plurality of power transmitting coils, a plurality of power transmitting circuits, and a controller. The plurality of power transmitting circuits correspond one-to-one with the plurality of power transmitting coils and supply transmission power to a corresponding one of the plurality of power transmitting coils. The controller controls the plurality of power transmitting circuits. Each of the plurality of power transmitting circuits outputs AC power to a corresponding one of the plurality of power transmitting coils. The power receiving terminal has a plurality of power receiving coils, a plurality of power receiving circuits, and a DC output unit. The plurality of power receiving coils receive AC power from an opposing one of the plurality of power transmitting coils. The plurality of power receiving circuits correspond one-to-one with the plurality of power receiving coils and convert the AC power received by a corresponding one of the plurality of power receiving coils into DC power. The DC output unit includes a first DC output terminal and a second DC output terminal. The first DC output terminal is commonly connected to the high-potential output terminals of the multiple power receiving circuits. The second DC output terminal is commonly connected to the low-potential output terminals of the multiple power receiving circuits. The controller acquires information on the output voltage of each of the multiple power receiving circuits via wireless signals from each of the multiple power receiving circuits, and controls at least one of the frequency and power of the transmission radio waves of each of the multiple power transmitting circuits so that the output voltages of the multiple power receiving circuits are the same.

　本開示に係る一態様の受電端末は、複数の送電コイルを有する送電器により給電される。前記受電端末は、複数の受電コイルと、複数の受電回路と、直流出力部と、を備える。前記複数の受電回路は、前記複数の受電コイルと一対一に対応し、前記複数の受電コイルのうち対応する受電コイルにより受電した交流電力を直流電力に変換する。前記直流出力部は、第１直流出力端子及び第２直流出力端子を含む。前記第１直流出力端子は、前記複数の受電回路それぞれの高電位側の出力端が共通接続される。前記第２直流出力端子は、前記複数の受電回路それぞれの低電位側の出力端が共通接続される。前記受電端末は、前記複数の受電回路それぞれの出力電圧の情報を前記複数の受電回路それぞれからの無線信号により送電器へ送信する。 A power receiving terminal according to one aspect of the present disclosure is supplied with power by a power transmitter having multiple power transmitting coils. The power receiving terminal includes multiple power receiving coils, multiple power receiving circuits, and a DC output unit. The multiple power receiving circuits correspond one-to-one with the multiple power receiving coils and convert AC power received by a corresponding one of the multiple power receiving coils into DC power. The DC output unit includes a first DC output terminal and a second DC output terminal. The first DC output terminal is commonly connected to the high-potential output terminals of the multiple power receiving circuits. The second DC output terminal is commonly connected to the low-potential output terminals of the multiple power receiving circuits. The power receiving terminal transmits information about the output voltage of each of the multiple power receiving circuits to the power transmitter via a wireless signal from each of the multiple power receiving circuits.

　本開示に係る一態様の送電器は、受電端末へ無線で送電する。前記送電器は、複数の送電コイルと、複数の送電回路と、コントローラと、を備える。前記複数の送電回路は、前記複数の送電コイルと一対一に対応し、前記複数の送電コイルのうち対応する送電コイルに送電電力を供給する。前記コントローラは、前記複数の送電回路を制御する。前記複数の送電回路の各々は、前記複数の送電コイルのうち対応する送電コイルへ交流電力を出力する。前記受電端末は、複数の受電コイルと、複数の受電回路と、直流出力部と、を備える。前記複数の受電コイルは、前記複数の送電コイルのうち対向する送電コイルから交流電力を受電する。前記複数の受電回路は、前記複数の受電コイルと一対一に対応し、前記複数の受電コイルのうち対応する受電コイルにより受電した交流電力を直流電力に変換する。前記直流出力部は、第１直流出力端子及び第２直流出力端子を含む。前記第１直流出力端子は、前記複数の受電回路それぞれの高電位側の出力端が共通接続される。前記第２直流出力端子は、前記複数の受電回路それぞれの低電位側の出力端が共通接続される。前記コントローラは、前記複数の受電回路それぞれの出力電圧の情報を前記複数の受電回路それぞれからの無線信号により取得し、前記複数の受電回路の互いの出力電圧が同じになるように、前記複数の送電回路の各々の送電電波の周波数と電力との少なくとも一方を制御する。 A power transmitter according to one aspect of the present disclosure wirelessly transmits power to a power receiving terminal. The power transmitter comprises a plurality of power transmitting coils, a plurality of power transmitting circuits, and a controller. The plurality of power transmitting circuits correspond one-to-one with the plurality of power transmitting coils and supply transmission power to a corresponding one of the plurality of power transmitting coils. The controller controls the plurality of power transmitting circuits. Each of the plurality of power transmitting circuits outputs AC power to a corresponding one of the plurality of power transmitting coils. The power receiving terminal comprises a plurality of power receiving coils, a plurality of power receiving circuits, and a DC output unit. The plurality of power receiving coils receive AC power from an opposing one of the plurality of power transmitting coils. The plurality of power receiving circuits correspond one-to-one with the plurality of power receiving coils and convert the AC power received by a corresponding one of the plurality of power receiving coils into DC power. The DC output unit includes a first DC output terminal and a second DC output terminal. The first DC output terminal is commonly connected to the high-potential output terminals of the multiple power receiving circuits. The second DC output terminal is commonly connected to the low-potential output terminals of the multiple power receiving circuits. The controller acquires information on the output voltage of each of the multiple power receiving circuits via wireless signals from each of the multiple power receiving circuits, and controls at least one of the frequency and power of the transmission radio waves of each of the multiple power transmitting circuits so that the output voltages of the multiple power receiving circuits are the same.

図１は、実施形態１に係る無線給電システムの構成図である。FIG. 1 is a configuration diagram of a wireless power supply system according to the first embodiment. 図２は、同上の無線給電システムにおける送電器が有する送電回路の回路図である。FIG. 2 is a circuit diagram of a power transmission circuit included in a power transmitter in the wireless power feeding system. 図３は、同上の無線給電システムにおける受電端末が有する受電回路の回路図である。FIG. 3 is a circuit diagram of a power receiving circuit included in a power receiving terminal in the wireless power feeding system. 図４は、同上の無線給電システムにおける送電器の概略分解斜視図である。FIG. 4 is a schematic exploded perspective view of a power transmitter in the wireless power feeding system. 図５は、同上の無線給電システムにおける送電器の筐体及び移動システムの概略平面図である。FIG. 5 is a schematic plan view of a housing of a power transmitter and a moving system in the wireless power feeding system. 図６は、実施形態１に係る送電器の動作を説明するフローチャートである。FIG. 6 is a flowchart illustrating the operation of the power transmitter according to the first embodiment. 図７は、実施形態２に係る無線給電システムの構成図である。FIG. 7 is a configuration diagram of a wireless power supply system according to the second embodiment. 図８は、同上の無線給電システムにおける送電器の要部構成図である。FIG. 8 is a configuration diagram of a main part of a power transmitter in the wireless power feeding system. 図９は、同上の無線給電システムにおける受電端末の要部構成図である。FIG. 9 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system. 図１０は、実施形態３に係る無線給電システムにおける送電器の要部構成図である。FIG. 10 is a diagram illustrating the configuration of a main part of a power transmitter in a wireless power feeding system according to the third embodiment. 図１１は、同上の無線給電システムにおける受電端末の要部構成図である。FIG. 11 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system. 図１２は、実施形態４に係る無線給電システムの構成図である。FIG. 12 is a configuration diagram of a wireless power supply system according to the fourth embodiment. 図１３は、同上の無線給電システムにおける送電器の要部構成図である。FIG. 13 is a configuration diagram of a main part of a power transmitter in the wireless power feeding system. 図１４は、同上の無線給電システムにおける受電端末の要部構成図である。FIG. 14 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system. 図１５は、実施形態５に係る無線給電システムにおける送電器の要部構成図である。FIG. 15 is a diagram illustrating the configuration of a main part of a power transmitter in a wireless power feeding system according to the fifth embodiment. 図１６は、同上の無線給電システムにおける受電端末の要部構成図である。FIG. 16 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system. 図１７は、実施形態６に係る無線給電システムの構成図である。FIG. 17 is a configuration diagram of a wireless power supply system according to the sixth embodiment. 図１８は、同上の無線給電システムにおける送電器の要部構成図である。FIG. 18 is a configuration diagram of a main part of a power transmitter in the wireless power feeding system. 図１９は、同上の無線給電システムにおける受電端末の要部構成図である。FIG. 19 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system. 図２０は、実施形態７に係る無線給電システムにおける送電器の要部構成図である。FIG. 20 is a configuration diagram of a main part of a power transmitter in a wireless power feeding system according to the seventh embodiment. 図２１は、同上の無線給電システムにおける受電端末の要部構成図である。FIG. 21 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system. 図２２は、実施形態８に係る無線給電システムの構成図である。FIG. 22 is a configuration diagram of a wireless power feeding system according to the eighth embodiment. 図２３は、同上の無線給電システムにおける受電端末の要部構成図である。FIG. 23 is a diagram showing the configuration of a main part of a power receiving terminal in the wireless power feeding system. 図２４は、実施形態８の変形例に係る無線給電システムにおける受電端末の要部構成図である。FIG. 24 is a diagram illustrating the configuration of a main part of a power receiving terminal in a wireless power feeding system according to a modified example of the eighth embodiment. 図２５は、実施形態９に係る無線給電システムの構成図である。FIG. 25 is a configuration diagram of a wireless power supply system according to the ninth embodiment. 図２６は、実施形態１０に係る無線給電システムの動作説明図である。FIG. 26 is a diagram illustrating the operation of the wireless power feeding system according to the tenth embodiment. 図２７は、同上の無線給電システムの動作説明図である。FIG. 27 is a diagram illustrating the operation of the wireless power supply system. 図２８は、同上の無線給電システムにおける電力効率の特性図である。FIG. 28 is a characteristic diagram of power efficiency in the wireless power feeding system. 図２９は、同上の無線給電システムの構成図である。FIG. 29 is a configuration diagram of the wireless power supply system. 図３０は、実施形態１０の変形例に係る無線給電システムの構成図である。FIG. 30 is a configuration diagram of a wireless power supply system according to a modification of the tenth embodiment. 図３１は、実施形態１１に係る無線給電システムの構成図である。FIG. 31 is a configuration diagram of a wireless power supply system according to the eleventh embodiment. 図３２は、実施形態１に係る送電器と、受電コイルを１つのみ有する受電端末と、を備える無線給電システムの構成図である。FIG. 32 is a configuration diagram of a wireless power feeding system including the power transmitter according to the first embodiment and a power receiving terminal having only one power receiving coil.

　以下、実施形態等について、図面を参照して説明する。以下の実施形態等において参照する図は、模式的な図であり、図中の構成要素の大きさ及び厚さは必ずしも実際の寸法を反映しているとは限らず、構成要素間における大きさの比及び厚さの比も、必ずしも実際の寸法比を反映しているとは限らない。 The following describes embodiments and the like with reference to the drawings. The drawings referred to in the following embodiments and the like are schematic diagrams, and the sizes and thicknesses of the components in the drawings do not necessarily reflect the actual dimensions, nor do the size and thickness ratios between the components necessarily reflect the actual dimensional ratios.

　（実施形態１）
　以下では、実施形態１に係る無線給電システム３について、図１～図６に基づいて説明する。 (Embodiment 1)
A wireless power supply system 3 according to the first embodiment will be described below with reference to FIGS. 1 to 6. FIG.

　（１）構成
　図１に示すように、無線給電システム３は、送電器１と、受電端末２と、を備える。受電端末２は、送電器１から給電される。送電器１は、複数（図１の例では２つ）の送電コイル１０と、複数（図１の例では２つ）の送電回路１１と、コントローラ１２と、を有する。複数の送電回路１１は、複数の送電コイル１０と一対一に対応し、複数の送電コイル１０のうち対応する送電コイル１０に送電電力を供給する。コントローラ１２は、複数の送電回路１１を制御する。複数の送電回路１１の各々は、複数の送電コイル１０のうち対応する送電コイル１０へ交流電力を出力する。受電端末２は、複数（図１の例では２つ）の受電コイル２０と、複数（図１の例では２つ）の受電回路２１と、直流出力部２４と、を有する。複数の受電コイル２０は、複数の送電コイル１０のうち対向する送電コイル１０から交流電力を受電する。複数の受電回路２１は、複数の受電コイル２０と一対一に対応し、複数の受電コイル２０のうち対応する受電コイル２０により受電した交流電力を直流電力に変換する。直流出力部２４は、第１直流出力端子２４１及び第２直流出力端子２４２を含む。第１直流出力端子２４１は、複数の受電回路２１それぞれの高電位側の出力端が共通接続される。第２直流出力端子２４２は、複数の受電回路２１それぞれの低電位側の出力端が共通接続される。コントローラ１２は、複数の受電回路２１それぞれの出力電圧の情報を複数の受電回路２１それぞれからの無線信号Ｗ２により取得し、複数の受電回路２１の互いの出力電圧が同じになるように、複数の送電回路１１の各々の送電電波の周波数と電力との少なくとも一方を制御する。 (1) Configuration As shown in FIG. 1 , the wireless power feeding system 3 includes a power transmitter 1 and a power receiving terminal 2. The power receiving terminal 2 is fed with power from the power transmitter 1. The power transmitter 1 includes a plurality of (two in the example of FIG. 1 ) power transmitting coils 10, a plurality of (two in the example of FIG. 1 ) power transmitting circuits 11, and a controller 12. The plurality of power transmitting circuits 11 correspond one-to-one to the plurality of power transmitting coils 10 and supply transmission power to a corresponding one of the plurality of power transmitting coils 10. The controller 12 controls the plurality of power transmitting circuits 11. Each of the plurality of power transmitting circuits 11 outputs AC power to a corresponding one of the plurality of power transmitting coils 10. The power receiving terminal 2 includes a plurality of (two in the example of FIG. 1 ) power receiving coils 20, a plurality of (two in the example of FIG. 1 ) power receiving circuits 21, and a DC output unit 24. The multiple power receiving coils 20 receive AC power from opposing power transmitting coils 10 among the multiple power transmitting coils 10. The multiple power receiving circuits 21 correspond one-to-one to the multiple power receiving coils 20 and convert the AC power received by a corresponding one of the multiple power receiving coils 20 into DC power. The DC output unit 24 includes a first DC output terminal 241 and a second DC output terminal 242. The first DC output terminal 241 is commonly connected to the high-potential output terminals of the multiple power receiving circuits 21. The second DC output terminal 242 is commonly connected to the low-potential output terminals of the multiple power receiving circuits 21. The controller 12 acquires information about the output voltage of each of the multiple power receiving circuits 21 via a wireless signal W2 from each of the multiple power receiving circuits 21 and controls at least one of the frequency and power of the power transmission radio waves of each of the multiple power transmitting circuits 11 so that the output voltages of the multiple power receiving circuits 21 are the same.

　上記の構成によれば、受電端末２での受電電力の大電力化及び電力効率の向上を図ることが可能となる。 The above configuration makes it possible to increase the power received by the power receiving terminal 2 and improve power efficiency.

　直流出力部２４には、例えば、電気エネルギを蓄積するためのバッテリ（例えば、リチウムイオン電池）が接続されているが、バッテリに限らず、例えば、電気エネルギを用いて動作する負荷が接続されていてもよい。 The DC output unit 24 is connected to, for example, a battery (e.g., a lithium-ion battery) for storing electrical energy, but is not limited to a battery; for example, a load that operates using electrical energy may also be connected.

　また、無線給電システム３では、送電器１は、電源回路１９を更に有する。 Furthermore, in the wireless power supply system 3, the power transmitter 1 further includes a power supply circuit 19.

　送電器１は、送電器１の上に配置された受電端末２に無線で給電する。受電端末２は、は、例えば、タブレット端末、スマートフォン又はノート型パーソナルコンピュータである。 The power transmitter 1 wirelessly supplies power to the power receiving terminal 2 placed on the power transmitter 1. The power receiving terminal 2 is, for example, a tablet terminal, a smartphone, or a laptop personal computer.

　（２）詳細
　以下、無線給電システム３の各構成要素について、より詳細に説明する。 (2) Details Each component of the wireless power supply system 3 will be described in more detail below.

　（２．１）送電器
　送電器１は、図１に示すように、２つの送電コイル１０と、２つの送電回路１１と、電源回路１９と、コントローラ１２と、を有する。 (2.1) Power Transmitter As shown in FIG. 1 , the power transmitter 1 includes two power transmission coils 10 , two power transmission circuits 11 , a power supply circuit 19 , and a controller 12 .

　２つの送電コイル１０の各々は、対向する受電コイル２０に、非接触で電力を送電する。２つの送電コイル１０は、第１送電コイル１０ａと、第２送電コイル１０ｂと、を含む。 Each of the two power transmission coils 10 transmits power to the opposing power receiving coil 20 in a non-contact manner. The two power transmission coils 10 include a first power transmission coil 10a and a second power transmission coil 10b.

　２つの送電回路１１は、２つの送電コイル１０と一対一に対応している。送電器１では、２つの送電回路１１の各々の２つの出力端間に、送電回路１１に対応する送電コイル１０が接続されている。２つの送電回路１１は、第１送電コイル１０ａに対応する第１送電回路１１ａと、第２送電コイル１０ｂに対応する第２送電回路１１ｂと、を含む。 The two power transmission circuits 11 correspond one-to-one to the two power transmission coils 10. In the power transmitter 1, the power transmission coil 10 corresponding to the power transmission circuit 11 is connected between the two output terminals of each of the two power transmission circuits 11. The two power transmission circuits 11 include a first power transmission circuit 11a corresponding to the first power transmission coil 10a and a second power transmission circuit 11b corresponding to the second power transmission coil 10b.

　２つの送電回路１１の各々は、直流電力を交流電力に変換するＤＣ－ＡＣ変換回路１１０（図２参照）を含む。ＤＣ－ＡＣ変換回路１１０は、例えば、図２に示すように、コンデンサＣ１１と、４つのスイッチング素子Ｑ１１、Ｑ１２、Ｑ１３、Ｑ１４と、制御回路１１５と、を有する。ＤＣ－ＡＣ変換回路１１０は、ＤＣ－ＡＣ変換回路１１０から出力される交流電圧の周波数と、ＤＣ－ＡＣ変換回路１１０の出力電力と、を変えることができる。 Each of the two power transmission circuits 11 includes a DC-AC conversion circuit 110 (see Figure 2) that converts DC power into AC power. As shown in Figure 2, the DC-AC conversion circuit 110 includes, for example, a capacitor C11, four switching elements Q11, Q12, Q13, and Q14, and a control circuit 115. The DC-AC conversion circuit 110 can change the frequency of the AC voltage output from the DC-AC conversion circuit 110 and the output power of the DC-AC conversion circuit 110.

　コンデンサＣ１１は、電源回路１９（図１参照）の出力端間に接続されている。４つのスイッチング素子Ｑ１１、Ｑ１２、Ｑ１３、Ｑ１４は、ブリッジ接続されている。送電回路１１では、スイッチング素子Ｑ１１とスイッチング素子Ｑ１２との直列回路と、スイッチング素子Ｑ１３とスイッチング素子Ｑ１４との直列回路とが、コンデンサＣ１１に並列接続されている。また、送電回路１１では、２つのスイッチング素子Ｑ１１、Ｑ１２同士の接続点と２つのスイッチング素子Ｑ１３、Ｑ１４同士の接続点との間に送電コイル１０が接続されている。 Capacitor C11 is connected between the output terminals of power supply circuit 19 (see Figure 1). Four switching elements Q11, Q12, Q13, and Q14 are bridge-connected. In power transmission circuit 11, a series circuit of switching elements Q11 and Q12 and a series circuit of switching elements Q13 and Q14 are connected in parallel to capacitor C11. In power transmission circuit 11, power transmission coil 10 is connected between the connection point between the two switching elements Q11 and Q12 and the connection point between the two switching elements Q13 and Q14.

　４つのスイッチング素子Ｑ１１、Ｑ１２、Ｑ１３、Ｑ１４の各々は、制御端子、第１主端子及び第２主端子を有する。４つのスイッチング素子Ｑ１１、Ｑ１２、Ｑ１３、Ｑ１４の各々は、例えば、ＭＯＳＦＥＴである。より詳細には、４つのスイッチング素子Ｑ１１、Ｑ１２、Ｑ１３、Ｑ１４の各々は、ノーマリオフ型のｎチャネルＭＯＳＦＥＴである。４つのスイッチング素子Ｑ１１、Ｑ１２、Ｑ１３、Ｑ１４の各々における、制御端子、第１主端子及び第２主端子は、それぞれ、ゲート端子、ドレイン端子及びソース端子である。４つのスイッチング素子Ｑ１１、Ｑ１２、Ｑ１３、Ｑ１４の各々の制御端子は、互いに異なるゲートドライバを介して制御回路１１５に接続されている。図２において、４つのスイッチング素子Ｑ１１～Ｑ１４に一対一に逆並列接続されている４つのダイオードは、４つのスイッチング素子Ｑ１１～Ｑ１４の各々を構成するｎチャネルＭＯＳＦＥＴの寄生ダイオードであるが、寄生ダイオードに限らず、外付けのダイオードであってもよい。 Each of the four switching elements Q11, Q12, Q13, and Q14 has a control terminal, a first main terminal, and a second main terminal. Each of the four switching elements Q11, Q12, Q13, and Q14 is, for example, a MOSFET. More specifically, each of the four switching elements Q11, Q12, Q13, and Q14 is a normally-off n-channel MOSFET. The control terminal, first main terminal, and second main terminal of each of the four switching elements Q11, Q12, Q13, and Q14 are, respectively, a gate terminal, a drain terminal, and a source terminal. The control terminals of each of the four switching elements Q11, Q12, Q13, and Q14 are connected to the control circuit 115 via different gate drivers. In Figure 2, the four diodes connected in anti-parallel to the four switching elements Q11 to Q14 in a one-to-one relationship are parasitic diodes of the n-channel MOSFETs that make up each of the four switching elements Q11 to Q14, but they are not limited to parasitic diodes and may also be external diodes.

　図１に示すように、電源回路１９は、例えば、２つの送電回路１１の一対の入出力端間に電源電圧を供給する。電源回路１９は、例えば、商用電源に接続される整流回路と、整流回路の出力端間に接続されている降圧チョッパ回路と、を含む。電源回路１９は、コントローラ１２にも電源電圧を供給する。電源回路１９から出力される電源電圧は、５Ｖであるが、５Ｖに限らず、例えば、１０Ｖ、１２Ｖ、１５Ｖ又は２４Ｖであってもよい。 As shown in FIG. 1, the power supply circuit 19 supplies a power supply voltage between a pair of input/output terminals of two power transmission circuits 11, for example. The power supply circuit 19 includes, for example, a rectifier circuit connected to a commercial power supply and a step-down chopper circuit connected between the output terminals of the rectifier circuit. The power supply circuit 19 also supplies a power supply voltage to the controller 12. The power supply voltage output from the power supply circuit 19 is 5V, but is not limited to 5V and may be, for example, 10V, 12V, 15V, or 24V.

　コントローラ１２は、２つの送電回路１１を制御する。コントローラ１２は、無線信号Ｗ２を受信するための第１通信回路（図示せず）を有している。コントローラ１２は、複数の受電回路２１それぞれの出力電圧の情報を複数（図１の例では２つ）の受電回路２１それぞれからの無線信号Ｗ２により取得し、複数の受電回路２１の互いの出力電圧が同じになるように、複数の送電回路１１の各々の送電電波の周波数と電力との少なくとも一方を制御する。「複数の受電回路２１の互いの出力電圧が同じ」とは、複数の受電回路２１の互いの出力電圧が厳密に同じである場合だけに限らず、１つの受電回路の出力電圧が残りの受電回路の出力電圧の９５％以上１０５％以下であればよい。本実施形態では、複数の受電回路２１が第１受電回路２１ａと第２受電回路２１ｂとを含んでおり、コントローラ１２が複数の受電回路２１それぞれから取得する無線信号Ｗ２は、第１受電回路２１ａからの無線信号Ｗ２ａと、第２受電回路２１ｂからの無線信号Ｗ２ｂと、を含む。コントローラ１２は、例えば、ＤＣ－ＡＣ変換回路１１０（図２参照）における制御回路１１５にＤＣ－ＡＣ変換回路１１０の出力電圧の周波数を変えるように指示することによって送電電波の周波数を制御する。また、コントローラ１２は、例えば、ＤＣ－ＡＣ変換回路１１０における制御回路１１５にＤＣ－ＡＣ変換回路１１０の出力電力を変えるように指示することによって送電電波の電力を制御する。 The controller 12 controls the two power transmission circuits 11. The controller 12 has a first communication circuit (not shown) for receiving a wireless signal W2. The controller 12 obtains information on the output voltage of each of the multiple power receiving circuits 21 via the wireless signal W2 from each of the multiple power receiving circuits 21 (two in the example of Figure 1), and controls at least one of the frequency and power of the transmission radio waves of each of the multiple power transmission circuits 11 so that the output voltages of the multiple power receiving circuits 21 are the same. "The output voltages of the multiple power receiving circuits 21 are the same" does not necessarily mean that the output voltages of the multiple power receiving circuits 21 are strictly the same, but may mean that the output voltage of one power receiving circuit is between 95% and 105% of the output voltages of the remaining power receiving circuits. In this embodiment, the multiple power receiving circuits 21 include a first power receiving circuit 21a and a second power receiving circuit 21b, and the wireless signal W2 acquired by the controller 12 from each of the multiple power receiving circuits 21 includes a wireless signal W2a from the first power receiving circuit 21a and a wireless signal W2b from the second power receiving circuit 21b. The controller 12 controls the frequency of the transmitted radio waves, for example, by instructing the control circuit 115 in the DC-AC conversion circuit 110 (see FIG. 2) to change the frequency of the output voltage of the DC-AC conversion circuit 110. The controller 12 also controls the power of the transmitted radio waves, for example, by instructing the control circuit 115 in the DC-AC conversion circuit 110 to change the output power of the DC-AC conversion circuit 110.

　本実施形態では、コントローラ１２は、送電器１の動作モードとして、第１送電モードと、第２送電モードと、を切り替えることができるように構成されている。第１送電モードは、送電器１と受電端末２との間で複数（図１の例では２つ）のコイルペアを同時に使用してコイルペアごとに送電を行い、複数（図１の例では２つ）の受電回路２１の出力電力を合成させる送電モードである。「コイルペア」とは、互いに対向させた送電コイル１０と受電コイル２０とのペアを意味する。したがって、複数のコイルペアは、例えば、第１送電コイル１０ａと第１受電コイル２０ａとのコイルペア（以下、第１ペアともいう）と、第２送電コイル１０ｂと第２受電コイル２０ｂとのコイルペア（以下、第２ペアともいう）と、を含む。第２送電モードは、送電器１と受電端末２又は受電端末２Ｒ（図３２参照）との間で１つのコイルペアを使用して電力を送電する送電モード（第２送電モード）である。受電端末２Ｒは、受電コイル２０の数が１つである点で、受電端末２と相違する。送電器１は、第１送電モードでは、第２送電モードよりも大電力の送電が可能である。 In this embodiment, the controller 12 is configured to be able to switch between a first power transmission mode and a second power transmission mode as the operating mode of the power transmitter 1. The first power transmission mode is a power transmission mode in which multiple (two in the example of Figure 1) coil pairs are used simultaneously between the power transmitter 1 and the power receiving terminal 2, power is transmitted for each coil pair, and the output power of multiple (two in the example of Figure 1) power receiving circuits 21 is combined. A "coil pair" refers to a pair of a power transmitting coil 10 and a power receiving coil 20 that face each other. Therefore, the multiple coil pairs include, for example, a coil pair of a first power transmitting coil 10a and a first power receiving coil 20a (hereinafter also referred to as the first pair), and a coil pair of a second power transmitting coil 10b and a second power receiving coil 20b (hereinafter also referred to as the second pair). The second power transmission mode is a power transmission mode (second power transmission mode) in which power is transmitted between the power transmitter 1 and the power receiving terminal 2 or the power receiving terminal 2R (see FIG. 32) using one coil pair. The power receiving terminal 2R differs from the power receiving terminal 2 in that it has one power receiving coil 20. In the first power transmission mode, the power transmitter 1 can transmit greater power than in the second power transmission mode.

　コントローラ１２は、コンピュータシステムを含んでいる。コンピュータシステムは、ハードウェアとしてのプロセッサ及びメモリを主構成とする。コンピュータシステムのメモリに記録されたプログラムをプロセッサが実行することによって、本開示におけるコントローラ１２としての機能が実現される。プログラムは、コンピュータシステムのメモリに予め記録されてもよく、電気通信回線を通じて提供されてもよく、コンピュータシステムで読み取り可能なメモリカード、光学ディスク、ハードディスクドライブ等の非一時的記録媒体に記録されて提供されてもよい。コンピュータシステムのプロセッサは、半導体集積回路（ＩＣ）又は大規模集積回路（ＬＳＩ）を含む１ないし複数の電子回路で構成される。ここでいうＩＣ又はＬＳＩ等の集積回路は、集積の度合いによって呼び方が異なっており、システムＬＳＩ、ＶＬＳＩ（Very Large Scale Integration）、又はＵＬＳＩ（Ultra Large Scale Integration）と呼ばれる集積回路を含む。さらに、ＬＳＩの製造後にプログラムされる、ＦＰＧＡ（Field-Programmable Gate Array）、又はＬＳＩ内部の接合関係の再構成若しくはＬＳＩ内部の回路区画の再構成が可能な論理デバイスについても、プロセッサとして採用することができる。複数の電子回路は、１つのチップに集約されていてもよいし、複数のチップに分散して設けられていてもよい。複数のチップは、１つの装置に集約されていてもよいし、複数の装置に分散して設けられていてもよい。ここでいうコンピュータシステムは、１以上のプロセッサ及び１以上のメモリを有するマイクロコントローラを含む。したがって、マイクロコントローラについても、半導体集積回路又は大規模集積回路を含む１ないし複数の電子回路で構成される。 The controller 12 includes a computer system. The computer system is primarily composed of a processor and memory as hardware. The functions of the controller 12 in this disclosure are realized by the processor executing a program recorded in the memory of the computer system. The program may be pre-recorded in the memory of the computer system, provided via a telecommunications line, or provided by being recorded on a non-transitory recording medium such as a memory card, optical disk, or hard disk drive that is readable by the computer system. The processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The integrated circuits such as ICs and LSIs referred to here are called different names depending on the degree of integration, and include integrated circuits called system LSIs, VLSIs (Very Large Scale Integration), or ULSIs (Ultra Large Scale Integration). Furthermore, FPGAs (Field-Programmable Gate Arrays), which are programmed after the LSI is manufactured, or logic devices that allow the reconfiguration of the connections within the LSI or the reconfiguration of the circuit partitions within the LSI, can also be used as processors. Multiple electronic circuits may be integrated into a single chip, or may be distributed across multiple chips. Multiple chips may be integrated into a single device, or may be distributed across multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, a microcontroller is also composed of one or more electronic circuits, including semiconductor integrated circuits or large-scale integrated circuits.

　送電器１は、図４に示すように、筐体４０と、移動システム５０と、位置検出装置６０と、を更に有する。筐体４０は、２つの送電コイル１０と、２つの送電回路１１と、コントローラ１２と、電源回路１９と、移動システム５０と、を収容している。なお、図４及び図５では、２つの送電回路１１、コントローラ１２及び電源回路１９の図示を省略している。 As shown in FIG. 4, the power transmitter 1 further includes a housing 40, a movement system 50, and a position detection device 60. The housing 40 houses two power transmission coils 10, two power transmission circuits 11, a controller 12, a power supply circuit 19, and the movement system 50. Note that the two power transmission circuits 11, the controller 12, and the power supply circuit 19 are not shown in FIGS. 4 and 5.

　筐体４０は、一面に開口を有する矩形箱状である。 The housing 40 is a rectangular box with an opening on one side.

　以下では、図４及び図５に示すように、互いに直交するＸ軸、Ｙ軸及びＺ軸の３軸を有する直交座標を規定し、特に、２つの送電コイル１０の巻軸方向に沿った軸を「Ｚ軸」として説明する。Ｘ軸、Ｙ軸、及びＺ軸は、いずれも仮想的な軸であり、図面中の「Ｘ」、「Ｙ」、「Ｚ」を示す矢印は、説明のために表記しているに過ぎず、いずれも実体を伴わない。 In the following, as shown in Figures 4 and 5, an orthogonal coordinate system is defined having three mutually orthogonal axes: the X-axis, the Y-axis, and the Z-axis. In particular, the axis along the winding axis direction of the two power transmission coils 10 will be referred to as the "Z-axis." The X-axis, the Y-axis, and the Z-axis are all imaginary axes, and the arrows indicating "X," "Y," and "Z" in the drawings are merely used for the purpose of explanation and do not have any physical substance.

　２つの送電コイル１０の各々は、スパイラル状の平面コイルである。Ｚ軸方向から見て、２つの送電コイル１０の各々の外形は、例えば、円形状である。 Each of the two power transmission coils 10 is a spiral planar coil. When viewed in the Z-axis direction, the outer shape of each of the two power transmission coils 10 is, for example, circular.

　移動システム５０は、２つの送電コイル１０を独立して移動させるように構成されている。２つの送電コイル１０は、第１送電コイル１０ａと、第２送電コイル１０ｂと、を含む。移動システム５０は、第１送電コイル１０ａ及び第２送電コイル１０ｂを独立して、Ｘ軸方向、Ｙ軸方向それぞれに移動させることができる。 The movement system 50 is configured to move two power transmission coils 10 independently. The two power transmission coils 10 include a first power transmission coil 10a and a second power transmission coil 10b. The movement system 50 can move the first power transmission coil 10a and the second power transmission coil 10b independently in the X-axis direction and the Y-axis direction, respectively.

　移動システム５０は、２つの台座５１と、２つのＸ軸レール５２と、２つのＹ軸レール５３と、２つのＸ軸駆動部５４と、２つのＹ軸駆動部５５と、４つの支持台５６と、を有する。 The movement system 50 has two bases 51, two X-axis rails 52, two Y-axis rails 53, two X-axis drive units 54, two Y-axis drive units 55, and four support bases 56.

　２つの台座５１は、２つの送電コイル１０と一対一に対応している。２つの台座５１の各々は、２つの送電コイル１０のうち対応する送電コイル１０を保持している。Ｚ軸方向から見て、２つの台座５１の各々の外形は、例えば、四角形状である。 The two bases 51 correspond one-to-one to the two power transmission coils 10. Each of the two bases 51 holds a corresponding one of the two power transmission coils 10. When viewed from the Z-axis direction, the outer shape of each of the two bases 51 is, for example, rectangular.

　２つのＸ軸レール５２の各々は、Ｘ軸方向に沿って配置されている。２つのＸ軸レール５２の各々は、Ｘ軸方向の長さがＹ軸方向の長さよりも長い長尺形状である。２つのＸ軸レール５２（第１Ｘ軸レール５２ａ、第２Ｘ軸レール５２ｂ）は、Ｙ軸方向において互いに離隔している。 Each of the two X-axis rails 52 is arranged along the X-axis direction. Each of the two X-axis rails 52 has an elongated shape such that its length in the X-axis direction is longer than its length in the Y-axis direction. The two X-axis rails 52 (first X-axis rail 52a, second X-axis rail 52b) are spaced apart from each other in the Y-axis direction.

　２つのＹ軸レール５３の各々は、Ｙ軸方向に沿って配置されている。２つのＹ軸レール５３の各々は、Ｙ軸方向の長さがＸ軸方向の長さよりも長い長尺形状である。２つのＹ軸レール５３は、Ｘ軸方向において互いに離隔している。２つのＹ軸レール５３の各々は、２つのＸ軸レール５２に移動自在に連結されている。 Each of the two Y-axis rails 53 is arranged along the Y-axis direction. Each of the two Y-axis rails 53 has an elongated shape with a length in the Y-axis direction greater than its length in the X-axis direction. The two Y-axis rails 53 are spaced apart from each other in the X-axis direction. Each of the two Y-axis rails 53 is movably connected to the two X-axis rails 52.

　２つのＸ軸駆動部５４は、２つのＹ軸レール５３と一対一に対応する。移動システム５０では、２つのＸ軸駆動部５４が、第１Ｘ軸駆動部５４ａと、第２Ｘ軸駆動部５４ｂと、を含み、２つのＹ軸レール５３が、第１Ｘ軸駆動部５４ａに対応する第１Ｙ軸レール５３ａと、第２Ｘ軸駆動部５４ｂに対応する第２Ｙ軸レール５３ｂと、を含む。第１Ｘ軸駆動部５４ａは、第１Ｙ軸レール５３ａに保持されている。第２Ｘ軸駆動部５４ｂは、第２Ｙ軸レール５３ｂに保持されている。第１Ｘ軸駆動部５４ａは、第１Ｙ軸レール５３ａを２つのＸ軸レール５２に沿って移動させる。第２Ｘ軸駆動部５４ｂは、第２Ｙ軸レール５３ｂを２つのＸ軸レール５２に沿って移動させる。 The two X-axis drive units 54 correspond one-to-one to the two Y-axis rails 53. In the movement system 50, the two X-axis drive units 54 include a first X-axis drive unit 54a and a second X-axis drive unit 54b, and the two Y-axis rails 53 include a first Y-axis rail 53a corresponding to the first X-axis drive unit 54a and a second Y-axis rail 53b corresponding to the second X-axis drive unit 54b. The first X-axis drive unit 54a is held by the first Y-axis rail 53a. The second X-axis drive unit 54b is held by the second Y-axis rail 53b. The first X-axis drive unit 54a moves the first Y-axis rail 53a along the two X-axis rails 52. The second X-axis drive unit 54b moves the second Y-axis rail 53b along the two X-axis rails 52.

　移動システム５０では、２つのＹ軸駆動部５５が、第１Ｙ軸駆動部５５ａと、第２Ｙ軸駆動部５５ｂと、を含む。第１Ｙ軸駆動部５５ａは、第１Ｙ軸レール５３ａに移動自在に連結された台座５１を第１Ｙ軸レール５３ａに沿って移動させる。第２Ｙ軸駆動部５５ｂは、第２Ｙ軸レール５３ｂに移動自在に連結された台座５１を第２Ｙ軸レール５３ｂに沿って移動させる。 In the movement system 50, the two Y-axis drive units 55 include a first Y-axis drive unit 55a and a second Y-axis drive unit 55b. The first Y-axis drive unit 55a moves the base 51, which is movably connected to the first Y-axis rail 53a, along the first Y-axis rail 53a. The second Y-axis drive unit 55b moves the base 51, which is movably connected to the second Y-axis rail 53b, along the second Y-axis rail 53b.

　本実施形態の移動システム５０は、複数のラック・アンド・ピニオン機構を有している。本実施形態では、２つのＸ軸レール５２の各々は、Ｘ軸方向に並んだ複数の歯を有するラックである。２つのＸ軸レール５２の各々は、筐体４０に固定された２つの支持台５６によって支持されている。 The movement system 50 of this embodiment has multiple rack-and-pinion mechanisms. In this embodiment, each of the two X-axis rails 52 is a rack with multiple teeth aligned in the X-axis direction. Each of the two X-axis rails 52 is supported by two support bases 56 fixed to the housing 40.

　２つのＸ軸駆動部５４の各々は、２つのＹ軸レール５３に一対一に対応しており、対応するＹ軸レール５３に保持されている。２つのＸ軸駆動部５４の各々は、Ｘ軸レール５２を構成するラックに噛み合うピニオン（歯車）５４２と、Ｙ軸レール５３に保持されておりピニオン５４２を回転させるモータ５４１と、を含む。ピニオン５４２は、モータ５４１の出力軸に連結されている。 Each of the two X-axis drive units 54 corresponds one-to-one to the two Y-axis rails 53 and is held by the corresponding Y-axis rail 53. Each of the two X-axis drive units 54 includes a pinion (gear) 542 that meshes with the rack that makes up the X-axis rail 52, and a motor 541 that is held by the Y-axis rail 53 and rotates the pinion 542. The pinion 542 is connected to the output shaft of the motor 541.

　本実施形態では、２つのＹ軸レール５３の各々は、Ｙ軸方向に並んだ複数の歯を有するラック５３１と、ラック５３１に隣接しているスライダ５３２と、を有する。スライダ５３２は、台座５１をスライド自在に保持している。 In this embodiment, each of the two Y-axis rails 53 has a rack 531 with multiple teeth aligned in the Y-axis direction, and a slider 532 adjacent to the rack 531. The slider 532 holds the base 51 in a slidable manner.

　２つのＹ軸駆動部５５の各々は、ラック５３１に噛み合うピニオン（歯車）５５２と、台座５１に保持されておりピニオン５５２を回転させるモータ５５１と、を含む。ピニオン５５２は、モータ５５１の出力軸に連結されている。 Each of the two Y-axis drive units 55 includes a pinion (gear) 552 that meshes with the rack 531, and a motor 551 that is held by the base 51 and rotates the pinion 552. The pinion 552 is connected to the output shaft of the motor 551.

　移動システム５０は、例えば、コントローラ１２によって制御される。移動システム５０では、第１Ｘ軸駆動部５４ａのモータ５４１、第２Ｘ軸駆動部５４ｂのモータ５４１、第１Ｙ軸駆動部５５ａのモータ５５１及び第２Ｙ軸駆動部５５ｂのモータ５５１は、コントローラ１２によって独立して制御される。 The movement system 50 is controlled, for example, by the controller 12. In the movement system 50, the motor 541 of the first X-axis drive unit 54a, the motor 541 of the second X-axis drive unit 54b, the motor 551 of the first Y-axis drive unit 55a, and the motor 551 of the second Y-axis drive unit 55b are independently controlled by the controller 12.

　移動システム５０は、複数（２つ）の送電コイル１０を独立して移動させることができればよく、上述の例に限らない。 The movement system 50 is not limited to the above example, as long as it can move multiple (two) power transmission coils 10 independently.

　位置検出装置６０は、送電器１の上に配置された受電端末２の受電コイル２０の位置を検出するための装置である。位置検出装置６０は、例えば、図４に示すように、複数（図４の例では６つ）の第１サーチコイル６１と、複数（図４の例では、４つ）の第２サーチコイル６２と、を有するプリント基板６３を含む。プリント基板６３は、矩形板状である。位置検出装置６０は、筐体４０の開口を閉塞するように、筐体４０に取り付けられる。 The position detection device 60 is a device for detecting the position of the receiving coil 20 of the receiving terminal 2 placed on the power transmitter 1. As shown in FIG. 4, the position detection device 60 includes a printed circuit board 63 having a plurality of first search coils 61 (six in the example of FIG. 4) and a plurality of second search coils 62 (four in the example of FIG. 4). The printed circuit board 63 is in the shape of a rectangular plate. The position detection device 60 is attached to the housing 40 so as to close the opening of the housing 40.

　複数の第１サーチコイル６１の各々の形状は、長方形状である。複数の第１サーチコイル６１の各々の長手方向は、Ｙ軸方向に沿った方向である。複数の第１サーチコイル６１は、Ｘ軸方向において等間隔で並んで配置されている。 Each of the multiple first search coils 61 is rectangular in shape. The longitudinal direction of each of the multiple first search coils 61 is along the Y-axis direction. The multiple first search coils 61 are arranged side by side at equal intervals in the X-axis direction.

　複数の第２サーチコイル６２の各々の形状は、長方形状である。複数の第２サーチコイル６２の各々の長手方向は、Ｘ軸方向に沿った方向である。複数の第２サーチコイル６２は、Ｙ軸方向において等間隔で並んで配置されている。 Each of the multiple second search coils 62 is rectangular in shape. The longitudinal direction of each of the multiple second search coils 62 is along the X-axis direction. The multiple second search coils 62 are arranged side by side at equal intervals in the Y-axis direction.

　プリント基板６３は、両面プリント基板又は多層プリント基板であり、複数の第１サーチコイル６１が配置されている第１面と複数の第２サーチコイル６２が配置されている第２面とがプリント基板６３の厚さ方向において互いに離隔している。プリント基板６３の厚さ方向は、Ｚ軸方向に沿った方向である。位置検出装置６０では、Ｚ軸方向から見て、複数の第１サーチコイル６１と複数の第２サーチコイル６２とが交差（直交）している。複数の第１サーチコイル６１及び複数の第２サーチコイル６２は、例えば、コントローラ１２に接続されている。複数の第１サーチコイル６１が配置されている第１面がプリント基板６３の第１主面の場合、複数の第１サーチコイル６１は、第１レジスト層（図示せず）により覆われている。複数の第２サーチコイル６２が配置されている第２面がプリント基板６３の第２主面の場合、複数の第２サーチコイル６２は、第２レジスト層（図示せず）により覆われている。 The printed circuit board 63 is a double-sided or multilayer printed circuit board, and a first surface on which the multiple first search coils 61 are arranged and a second surface on which the multiple second search coils 62 are arranged are spaced apart in the thickness direction of the printed circuit board 63. The thickness direction of the printed circuit board 63 is along the Z-axis direction. In the position detection device 60, the multiple first search coils 61 and the multiple second search coils 62 intersect (orthogonally) when viewed from the Z-axis direction. The multiple first search coils 61 and the multiple second search coils 62 are connected to, for example, the controller 12. If the first surface on which the multiple first search coils 61 are arranged is the first main surface of the printed circuit board 63, the multiple first search coils 61 are covered with a first resist layer (not shown). If the second surface on which the multiple second search coils 62 are arranged is the second main surface of the printed circuit board 63, the multiple second search coils 62 are covered with a second resist layer (not shown).

　コントローラ１２は、複数の第１サーチコイル６１及び複数の第２サーチコイル６２にパルス信号を供給する。 The controller 12 supplies pulse signals to the multiple first search coils 61 and the multiple second search coils 62.

　送電器１の上に受電端末２が配置された場合、受電端末２の２つの受電コイル２０の各々は、パルス信号に励起されて、複数の第１サーチコイル６１のうち対向する第１サーチコイル６１に、エコー信号を出力する。第１サーチコイル６１は、受信したエコー信号をコントローラ１２へ出力する。コントローラ１２は、予め記憶している複数の第１サーチコイル６１の各々の位置情報と、エコー信号のレベルとに基づいて、受電コイル２０のＸ座標を求める。例えば、コントローラ１２は、複数の第１サーチコイル６１のうち、エコー信号のレベルが所定値以上であり、かつ、極大（local maximum）となる第１サーチコイル６１のＸ座標を、受電コイル２０のＸ座標とする。 When a power receiving terminal 2 is placed on the power transmitter 1, each of the two power receiving coils 20 of the power receiving terminal 2 is excited by a pulse signal and outputs an echo signal to the opposing first search coil 61 of the multiple first search coils 61. The first search coil 61 outputs the received echo signal to the controller 12. The controller 12 calculates the X coordinate of the power receiving coil 20 based on the position information of each of the multiple first search coils 61 stored in advance and the level of the echo signal. For example, the controller 12 determines the X coordinate of the first search coil 61 of the multiple first search coils 61 whose echo signal level is equal to or greater than a predetermined value and is at a local maximum as the X coordinate of the power receiving coil 20.

　また、送電器１の上に受電端末２が配置された場合、受電端末２の２つの受電コイル２０の各々は、パルス信号に励起されて、複数の第２サーチコイル６２のうち対向する第２サーチコイル６２に、エコー信号を出力する。第２サーチコイル６２は、エコー信号を受信し、コントローラ１２へ出力する。コントローラ１２は、予め記憶している複数の第２サーチコイル６２の各々の位置情報と、エコー信号のレベルとに基づいて、受電コイル２０のＹ座標を求める。例えば、コントローラ１２は、複数の第２サーチコイル６２のうち、エコー信号のレベルが所定値以上であり、かつ、極大となる第２サーチコイル６２のＹ座標を、受電コイル２０のＹ座標とする。 Furthermore, when a power receiving terminal 2 is placed on the power transmitter 1, each of the two power receiving coils 20 of the power receiving terminal 2 is excited by a pulse signal and outputs an echo signal to the opposing second search coil 62 of the multiple second search coils 62. The second search coil 62 receives the echo signal and outputs it to the controller 12. The controller 12 calculates the Y coordinate of the power receiving coil 20 based on the position information of each of the multiple second search coils 62 stored in advance and the level of the echo signal. For example, the controller 12 determines the Y coordinate of the second search coil 62 of the multiple second search coils 62 whose echo signal level is equal to or greater than a predetermined value and is at a maximum as the Y coordinate of the power receiving coil 20.

　送電器１は、図３２に示すように、受電コイル２０を１つしか有していない２つの受電端末２Ｒにも送電することができるように構成されている。受電端末２Ｒに関し、受電端末２と同様の構成要素には同一の符号を付して説明を省略する。 As shown in Figure 32, the power transmitter 1 is configured to be able to transmit power to two power receiving terminals 2R, each of which has only one power receiving coil 20. Components of the power receiving terminal 2R that are the same as those of the power receiving terminal 2 are designated by the same reference numerals, and descriptions thereof will be omitted.

　（２．２）受電端末
　受電端末２は、図１に示すように、２つの受電コイル２０と、２つの受電回路２１と、直流出力部２４と、を有する。 (2.2) Power Receiving Terminal As shown in FIG. 1 , the power receiving terminal 2 has two power receiving coils 20 , two power receiving circuits 21 , and a DC output unit 24 .

　複数（図１の例では２つ）の受電コイル２０の各々は、複数（図１の例では２つ）の送電コイル１０のうち対向する送電コイル１０から電磁誘導又は磁界共鳴により交流電力を受電する。２つの受電コイル２０の各々は、スパイラル状の平面コイルである。２つの受電コイル２０の各々の外形は、例えば、円形状である。２つの受電コイル２０は、第１受電コイル２０ａと、第２受電コイル２０ｂと、を含む。 Each of the multiple (two in the example of Figure 1) receiving coils 20 receives AC power from an opposing one of the multiple (two in the example of Figure 1) transmitting coils 10 through electromagnetic induction or magnetic field resonance. Each of the two receiving coils 20 is a spiral planar coil. The outer shape of each of the two receiving coils 20 is, for example, circular. The two receiving coils 20 include a first receiving coil 20a and a second receiving coil 20b.

　２つの受電回路２１は、２つの受電コイル２０と一対一に対応している。受電端末２では、２つの受電回路２１の各々の２つの入力端間に、受電回路２１に対応する受電コイル２０が接続されている。２つの受電回路２１は、第１受電コイル２０ａに対応する第１受電回路２１ａと、第２受電コイル２０ｂに対応する第２受電回路２１ｂと、を含む。 The two power receiving circuits 21 correspond one-to-one to the two power receiving coils 20. In the power receiving terminal 2, the power receiving coil 20 corresponding to the power receiving circuit 21 is connected between the two input terminals of each of the two power receiving circuits 21. The two power receiving circuits 21 include a first power receiving circuit 21a corresponding to the first power receiving coil 20a and a second power receiving circuit 21b corresponding to the second power receiving coil 20b.

　複数の受電回路２１の各々は、例えば、図３に示すように、整流回路２１１を含む。図３の例では、整流回路２１１は、４つのスイッチング素子Ｑ２１、Ｑ２２、Ｑ２３、Ｑ２４と、コンデンサＣ２１と、制御回路２１５と、を有する。 Each of the multiple power receiving circuits 21 includes a rectifier circuit 211, as shown in FIG. 3, for example. In the example of FIG. 3, the rectifier circuit 211 has four switching elements Q21, Q22, Q23, and Q24, a capacitor C21, and a control circuit 215.

　４つのスイッチング素子Ｑ２１、Ｑ２２、Ｑ２３、Ｑ２４は、ブリッジ接続されている。整流回路２１１では、スイッチング素子Ｑ２１とスイッチング素子Ｑ２２との直列回路と、スイッチング素子Ｑ２３とスイッチング素子Ｑ２４との直列回路とが、並列接続されている。また、整流回路２１１では、２つのスイッチング素子Ｑ２１、Ｑ２２同士の接続点と２つのスイッチング素子Ｑ２３、Ｑ２４同士の接続点との間に受電コイル２０が接続されている。また、整流回路２１１では、コンデンサＣ２１が、スイッチング素子Ｑ２３とスイッチング素子Ｑ２４との直列回路と、スイッチング素子Ｑ２１とスイッチング素子Ｑ２２との直列回路と、に並列接続されている。 The four switching elements Q21, Q22, Q23, and Q24 are bridge-connected. In the rectifier circuit 211, a series circuit of switching elements Q21 and Q22 and a series circuit of switching elements Q23 and Q24 are connected in parallel. In the rectifier circuit 211, the receiving coil 20 is connected between the connection point between the two switching elements Q21 and Q22 and the connection point between the two switching elements Q23 and Q24. In the rectifier circuit 211, the capacitor C21 is connected in parallel to the series circuit of switching elements Q23 and Q24 and the series circuit of switching elements Q21 and Q22.

　４つのスイッチング素子Ｑ２１、Ｑ２２、Ｑ２３、Ｑ２４の各々は、制御端子、第１主端子及び第２主端子を有する。４つのスイッチング素子Ｑ２１、Ｑ２２、Ｑ２３、Ｑ２４の各々は、例えば、ＭＯＳＦＥＴである。より詳細には、４つのスイッチング素子Ｑ２１、Ｑ２２、Ｑ２３、Ｑ２４の各々は、ノーマリオフ型のｎチャネルＭＯＳＦＥＴである。４つのスイッチング素子Ｑ２１、Ｑ２２、Ｑ２３、Ｑ２４の各々における、制御端子、第１主端子及び第２主端子は、それぞれ、ゲート端子、ドレイン端子及びソース端子である。４つのスイッチング素子Ｑ２１、Ｑ２２、Ｑ２３、Ｑ２４の各々の制御端子は、互いに異なるゲートドライバを介して制御回路２１５に接続されている。図３において、４つのスイッチング素子Ｑ２１～Ｑ２４に一対一に逆並列接続されている４つのダイオードは、４つのスイッチング素子Ｑ２１～Ｑ２４の各々を構成するｎチャネルＭＯＳＦＥＴの寄生ダイオードであるが、寄生ダイオードに限らず、外付けのダイオードであってもよい。 Each of the four switching elements Q21, Q22, Q23, and Q24 has a control terminal, a first main terminal, and a second main terminal. Each of the four switching elements Q21, Q22, Q23, and Q24 is, for example, a MOSFET. More specifically, each of the four switching elements Q21, Q22, Q23, and Q24 is a normally-off n-channel MOSFET. The control terminal, first main terminal, and second main terminal of each of the four switching elements Q21, Q22, Q23, and Q24 are, respectively, a gate terminal, a drain terminal, and a source terminal. The control terminals of each of the four switching elements Q21, Q22, Q23, and Q24 are connected to the control circuit 215 via different gate drivers. In Figure 3, the four diodes connected in anti-parallel to the four switching elements Q21 to Q24 in a one-to-one relationship are parasitic diodes of the n-channel MOSFETs that make up each of the four switching elements Q21 to Q24, but they are not limited to parasitic diodes and may also be external diodes.

　制御回路２１５は、４つのスイッチング素子Ｑ２１、Ｑ２２、Ｑ２３、Ｑ２４を制御する。本実施形態では、制御回路２１５は、整流回路２１１が同期整流回路として動作するように４つのスイッチング素子Ｑ２１、Ｑ２２、Ｑ２３、Ｑ２４を制御する。 The control circuit 215 controls the four switching elements Q21, Q22, Q23, and Q24. In this embodiment, the control circuit 215 controls the four switching elements Q21, Q22, Q23, and Q24 so that the rectifier circuit 211 operates as a synchronous rectifier circuit.

　２つの受電回路２１の各々は、受電回路２１の出力電圧（整流回路２１１の出力電圧）を測定する電圧測定回路２２と、第２通信回路２６と、を更に含んでいる。電圧測定回路２２は、例えば、抵抗分圧回路を含む。第２通信回路２６は、アンテナを有している。また、第２通信回路２６は、アンテナに接続されているＲＦＩＣ（Radio Frequency Integrated Circuit）を有している。第２通信回路２６は、コントローラ１２の第１通信回路との間で無線通信を行うことができ、無線信号Ｗ２をコントローラ１２の第１通信回路へ送信する。 Each of the two power receiving circuits 21 further includes a voltage measurement circuit 22 that measures the output voltage of the power receiving circuit 21 (the output voltage of the rectifier circuit 211), and a second communication circuit 26. The voltage measurement circuit 22 includes, for example, a resistive voltage divider circuit. The second communication circuit 26 has an antenna. The second communication circuit 26 also has an RFIC (Radio Frequency Integrated Circuit) connected to the antenna. The second communication circuit 26 is capable of wireless communication with the first communication circuit of the controller 12, and transmits a wireless signal W2 to the first communication circuit of the controller 12.

　受電端末２は、直流出力部２４に接続されている上述のバッテリ（図示せず）を有しており、バッテリを電源として動作する。 The power receiving terminal 2 has the above-mentioned battery (not shown) connected to the DC output unit 24, and operates using the battery as a power source.

　（３）無線給電システムの動作
　以下では、送電器１の動作例について図６に基づいて説明する。 (3) Operation of Wireless Power Supply System An example of the operation of the power transmitter 1 will be described below with reference to FIG.

　コントローラ１２は、位置検出装置６０により受電コイル２０を検出すると（ステップＳ１：Ｙｅｓ）、受電コイル２０の数が１つか否かを判定する（ステップＳ２）。コントローラ１２は、受電コイル２０の数が１つの場合（ステップＳ２：Ｙｅｓ）、動作モードを第２送電モードに切り替える（ステップＳ３）。なお、受電コイル２０の数が１つの場合は、例えば図３２に示した２つの受電端末２Ｒのうち１つの受電端末２Ｒ（例えば、図３２における左側の受電端末２Ｒ）のみが送電器１の上に配置されたときである。 When the controller 12 detects a power receiving coil 20 using the position detection device 60 (step S1: Yes), it determines whether there is one power receiving coil 20 (step S2). If there is one power receiving coil 20 (step S2: Yes), the controller 12 switches the operating mode to the second power transmission mode (step S3). Note that a case in which there is one power receiving coil 20 occurs when, for example, only one of the two power receiving terminals 2R shown in FIG. 32 (for example, the left power receiving terminal 2R in FIG. 32) is placed on the power transmitter 1.

　コントローラ１２は、ステップＳ３の後、受電コイル２０の位置（Ｘ座標及びＹ座標）を特定し（ステップＳ４）、２つの送電コイル１０のうち受電コイル２０に近い送電コイル１０（例えば、第１送電コイル１０ａ）を、移動システム５０により受電端末２Ｒの受電コイル２０に対向する位置に移動させ、送電コイル１０から受電コイル２０への送電を開始させる（ステップＳ５）。ステップＳ５の後、他の受電コイル２０を検出すると（ステップＳ６：Ｙｅｓ）、他の受電コイル２０の位置を特定し（ステップＳ７）、２つの送電コイル１０のうち残りの１つの送電コイル１０（例えば、第２送電コイル１０ｂ）を他の受電コイル２０に対向する位置に移動させ、送電コイル１０から受電コイル２０への送電を開始させる（ステップＳ８）。ステップＳ８の後、全て（例えば、２つ）の受電コイル２０への送電が完了すると（ステップＳ９）、送電回路１１の動作を終了させる。なお、他の受電コイル２０は、例えば、図３２に示した受電端末２Ｒのうち右側の受電端末２Ｒが有する受電コイル２０である。 After step S3, the controller 12 identifies the position (X and Y coordinates) of the receiving coil 20 (step S4), moves the transmitting coil 10 (e.g., the first transmitting coil 10a) closest to the receiving coil 20 of the two transmitting coils 10 to a position facing the receiving coil 20 of the receiving terminal 2R using the moving system 50, and starts transmitting power from the transmitting coil 10 to the receiving coil 20 (step S5). After step S5, if another receiving coil 20 is detected (step S6: Yes), the controller 12 identifies the position of the other receiving coil 20 (step S7), moves the remaining transmitting coil 10 (e.g., the second transmitting coil 10b) of the two transmitting coils 10 to a position facing the other receiving coil 20, and starts transmitting power from the transmitting coil 10 to the receiving coil 20 (step S8). After step S8, when power transmission to all (e.g., two) receiving coils 20 is completed (step S9), the operation of the power transmission circuit 11 is terminated. The other power receiving coil 20 is, for example, the power receiving coil 20 of the power receiving terminal 2R on the right side of the power receiving terminals 2R shown in FIG. 32.

　また、コントローラ１２は、ステップＳ１において検出した受電コイル２０の数が複数（例えば、２つ）の場合（ステップＳ２：Ｎｏ）、受電端末の数が１つか否かを判定する（ステップＳ１０）。コントローラ１２は、受電端末の数が１つの場合（ステップＳ１０：Ｙｅｓ）、動作モードを第１送電モードに切り替える（ステップＳ１１）。一方、コントローラ１２は、受電端末の数が１つでない場合（ステップＳ１０：Ｎｏ）、ステップＳ３へ移行する。 Furthermore, if the number of power receiving coils 20 detected in step S1 is multiple (e.g., two) (step S2: No), the controller 12 determines whether the number of power receiving terminals is one (step S10). If the number of power receiving terminals is one (step S10: Yes), the controller 12 switches the operating mode to the first power transmission mode (step S11). On the other hand, if the number of power receiving terminals is not one (step S10: No), the controller 12 proceeds to step S3.

　コントローラ１２は、ステップＳ１１の後、全て（例えば、２つ）の受電コイル２０の位置を特定する（ステップＳ１２）。その後、コントローラ１２は、第１送電コイル１０ａを、移動システム５０により第１受電コイル２０ａに対向するように移動させ、第１送電コイル１０ａから第１受電コイル２０ａへの送電を開始させる（ステップＳ１３）。その後、コントローラ１２は、第２送電コイル１０ｂを、移動システム５０により第２受電コイル２０ｂに対向するように移動させ、第２送電コイル１０ｂから第２受電コイル２０ｂへの送電を開始させる（ステップＳ１４）。ステップＳ１４の後、全て（例えば、２つ）の受電コイル２０への送電が完了すると（ステップＳ９）、コントローラ１２は、送電回路１１の動作を終了させる。 After step S11, the controller 12 identifies the positions of all (e.g., two) receiving coils 20 (step S12). Then, the controller 12 moves the first transmitting coil 10a using the moving system 50 so that it faces the first receiving coil 20a, and starts transmitting power from the first transmitting coil 10a to the first receiving coil 20a (step S13). Then, the controller 12 moves the second transmitting coil 10b using the moving system 50 so that it faces the second receiving coil 20b, and starts transmitting power from the second transmitting coil 10b to the second receiving coil 20b (step S14). After step S14, when power transmission to all (e.g., two) receiving coils 20 is completed (step S9), the controller 12 ends the operation of the power transmission circuit 11.

　（４）利点
　実施形態１に係る無線給電システム３では、複数の送電回路１１の各々は、複数の送電コイル１０のうち対応する送電コイル１０へ交流電力を出力する。受電端末２は、複数の受電コイル２０と、複数の受電回路２１と、直流出力部２４と、を有する。直流出力部２４は、第１直流出力端子２４１及び第２直流出力端子２４２を含む。コントローラ１２は、複数の受電回路２１それぞれの出力電圧の情報を複数の受電回路２１それぞれからの無線信号Ｗ２により取得し、複数の受電回路２１の互いの出力電圧が同じになるように、複数の送電回路１１の各々の送電電波の周波数と電力との少なくとも一方を制御する。 (4) Advantages In the wireless power feeding system 3 according to the first embodiment, each of the multiple power transmitting circuits 11 outputs AC power to a corresponding one of the multiple power transmitting coils 10. The power receiving terminal 2 includes multiple power receiving coils 20, multiple power receiving circuits 21, and a DC output unit 24. The DC output unit 24 includes a first DC output terminal 241 and a second DC output terminal 242. The controller 12 acquires information about the output voltage of each of the multiple power receiving circuits 21 via a wireless signal W2 from each of the multiple power receiving circuits 21, and controls at least one of the frequency and power of the power transmission radio waves of each of the multiple power transmitting circuits 11 so that the output voltages of the multiple power receiving circuits 21 are the same.

　上記の構成によれば、受電端末２での受電電力の大電力化及び電力効率を向上させることが可能となる。より詳細には、実施形態１に係る無線給電システム３は、送電器１が２つの送電コイル１０を有し、受電端末２が２つの受電コイル２０を有し、受電端末２において受電電力を合成できるので、受電端末２での受電電力の大電力化を図ることが可能となる。また、無線給電システムでは、送電コイルと受電コイルとのペア毎に送電電波の最適な条件が異なり、受電コイルに接続された受電回路の出力電圧が異なる場合がある。しかしながら、実施形態１に係る無線給電システム３では、送電器１が複数の送電回路１１を有し、コントローラ１２が複数の受電回路２１の互いの出力電圧が同じになるように、複数の送電回路１１の各々の送電電波の周波数と電力との少なくとも一方を制御するので、複数の受電回路２１同士の出力電圧の差によって受電回路２１間で電流が流れることを抑制でき、電力効率を向上させることが可能となる。 The above configuration makes it possible to increase the received power and improve power efficiency at the power receiving terminal 2. More specifically, in the wireless power transfer system 3 according to embodiment 1, the power transmitter 1 has two power transmitting coils 10, the power receiving terminal 2 has two power receiving coils 20, and the received power can be combined at the power receiving terminal 2, making it possible to increase the received power at the power receiving terminal 2. Furthermore, in a wireless power transfer system, the optimal conditions for the transmitted radio waves differ for each pair of a power transmitting coil and a power receiving coil, and the output voltage of the power receiving circuit connected to the power receiving coil may differ. However, in the wireless power transfer system 3 according to embodiment 1, the power transmitter 1 has multiple power transmitting circuits 11, and the controller 12 controls at least one of the frequency and power of the transmitted radio waves from each of the multiple power transmitting circuits 11 so that the output voltages of the multiple power receiving circuits 21 are the same. This makes it possible to prevent current from flowing between the power receiving circuits 21 due to differences in output voltage between the multiple power receiving circuits 21, thereby improving power efficiency.

　また、実施形態１に係る無線給電システム３では、受電端末２は、複数の受電回路２１の各々から無線信号Ｗ２をコントローラ１２へ送信する。 Furthermore, in the wireless power supply system 3 according to embodiment 1, the power receiving terminal 2 transmits a wireless signal W2 from each of the multiple power receiving circuits 21 to the controller 12.

　上記の構成によれば、複数の送電回路１１の各々において無線信号Ｗ２を受信する必要がないので、送電器１の小型化及び軽量化を図ることが可能となる。 With the above configuration, there is no need for each of the multiple power transmission circuits 11 to receive the wireless signal W2, making it possible to reduce the size and weight of the power transmitter 1.

　また、実施形態１に係る受電端末２は、複数の送電コイル１０を有する送電器１により給電される。受電端末２は、複数の受電コイル２０と、複数の受電回路２１と、直流出力部２４と、を備える。複数の受電回路２１は、複数の受電コイル２０と一対一に対応し、複数の受電コイル２０のうち対応する受電コイル２０により受電した交流電力を直流電力に変換する。直流出力部２４は、第１直流出力端子２４１及び第２直流出力端子２４２を含む。第１直流出力端子２４１は、複数の受電回路２１それぞれの高電位側の出力端が共通接続される。第２直流出力端子２４２は、複数の受電回路２１それぞれの低電位側の出力端が共通接続される。受電端末２は、複数の受電回路２１それぞれの出力電圧の情報を複数の受電回路２１それぞれからの無線信号Ｗ２により送電器１へ送信する。 Furthermore, the power receiving terminal 2 according to the first embodiment is supplied with power by a power transmitter 1 having multiple power transmitting coils 10. The power receiving terminal 2 includes multiple power receiving coils 20, multiple power receiving circuits 21, and a DC output unit 24. The multiple power receiving circuits 21 correspond one-to-one to the multiple power receiving coils 20 and convert AC power received by a corresponding power receiving coil 20 of the multiple power receiving coils 20 into DC power. The DC output unit 24 includes a first DC output terminal 241 and a second DC output terminal 242. The first DC output terminal 241 is commonly connected to the high-potential output terminals of the multiple power receiving circuits 21. The second DC output terminal 242 is commonly connected to the low-potential output terminals of the multiple power receiving circuits 21. The power receiving terminal 2 transmits information about the output voltage of each of the multiple power receiving circuits 21 to the power transmitter 1 via a wireless signal W2 from each of the multiple power receiving circuits 21.

　上記の構成によれば、受電端末２での受電電力の大電力化及び電力効率の向上を図ることが可能となる。 The above configuration makes it possible to increase the power received by the power receiving terminal 2 and improve power efficiency.

　実施形態１に係る送電器１は、受電端末２へ無線で送電する。送電器１は、複数の送電コイル１０と、複数の送電回路１１と、コントローラ１２と、を備える。複数の送電回路１１は、複数の送電コイル１０と一対一に対応し、複数の送電コイル１０のうち対応する送電コイル１０に送電電力を供給する。コントローラ１２は、複数の送電回路１１を制御する。複数の送電回路１１の各々は、複数の送電コイル１０のうち対応する送電コイル１０へ交流電力を出力する。受電端末２は、複数の受電コイル２０と、複数の受電回路２１と、直流出力部２４と、を備える。複数の受電コイル２０は、複数の送電コイル１０のうち対向する送電コイル１０から交流電力を受電する。複数の受電回路２１は、複数の受電コイル２０と一対一に対応し、複数の受電コイル２０のうち対応する受電コイル２０により受電した交流電力を直流電力に変換する。直流出力部２４は、第１直流出力端子２４１及び第２直流出力端子２４２を含む。第１直流出力端子２４１は、複数の受電回路２１それぞれの高電位側の出力端が共通接続される。第２直流出力端子２４２は、複数の受電回路２１それぞれの低電位側の出力端が共通接続される。コントローラ１２は、複数の受電回路２１それぞれの出力電圧の情報を複数の受電回路２１それぞれからの無線信号Ｗ２により取得し、複数の受電回路２１の互いの出力電圧が同じになるように、複数の送電回路１１の各々の送電電波の周波数と電力との少なくとも一方を制御する。 The power transmitter 1 of embodiment 1 wirelessly transmits power to the power receiving terminal 2. The power transmitter 1 includes a plurality of power transmitting coils 10, a plurality of power transmitting circuits 11, and a controller 12. The plurality of power transmitting circuits 11 correspond one-to-one to the plurality of power transmitting coils 10, and supply transmission power to a corresponding one of the plurality of power transmitting coils 10. The controller 12 controls the plurality of power transmitting circuits 11. Each of the plurality of power transmitting circuits 11 outputs AC power to a corresponding one of the plurality of power transmitting coils 10. The power receiving terminal 2 includes a plurality of power receiving coils 20, a plurality of power receiving circuits 21, and a DC output unit 24. The plurality of power receiving coils 20 receive AC power from an opposing one of the plurality of power transmitting coils 10. The multiple power receiving circuits 21 correspond one-to-one to the multiple power receiving coils 20 and convert AC power received by a corresponding one of the multiple power receiving coils 20 into DC power. The DC output unit 24 includes a first DC output terminal 241 and a second DC output terminal 242. The first DC output terminal 241 is commonly connected to the high-potential output terminals of the multiple power receiving circuits 21. The second DC output terminal 242 is commonly connected to the low-potential output terminals of the multiple power receiving circuits 21. The controller 12 acquires information about the output voltage of each of the multiple power receiving circuits 21 via a wireless signal W2 from each of the multiple power receiving circuits 21 and controls at least one of the frequency and power of the transmission radio waves of each of the multiple power transmitting circuits 11 so that the output voltages of the multiple power receiving circuits 21 are the same.

　上記の構成によれば、受電端末２での受電電力の大電力化及び電力効率の向上を図ることが可能となる。 The above configuration makes it possible to increase the power received by the power receiving terminal 2 and improve power efficiency.

　（実施形態２）
　以下、実施形態２に係る無線給電システム３Ａについて、図７～図９に基づいて説明する。実施形態２に係る無線給電システム３Ａに関し、実施形態１に係る無線給電システム３と同様の構成要素については、同一の符号を付して説明を適宜省略する。 (Embodiment 2)
A wireless power feeding system 3A according to the second embodiment will be described below with reference to Fig. 7 to Fig. 9. Regarding the wireless power feeding system 3A according to the second embodiment, the same components as those in the wireless power feeding system 3 according to the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

　（１）構成
　無線給電システム３Ａは、図７に示すように、実施形態１に係る送電器１及び受電端末２の代わりに、送電器１Ａ及び受電端末２Ａを備える点で、実施形態１に係る無線給電システム３と相違する。送電器１Ａに関し、送電器１と同様の構成要素には同一の符号を付して説明を適宜省略する。また、受電端末２Ａに関し、受電端末２と同様の構成要素には同一の符号を付して説明を適宜省略する。 (1) Configuration As shown in Fig. 7 , the wireless power feeding system 3A differs from the wireless power feeding system 3 according to the first embodiment in that it includes a power transmitter 1A and a power receiving terminal 2A instead of the power transmitter 1 and the power receiving terminal 2 according to the first embodiment. Regarding the power transmitter 1A, the same components as those of the power transmitter 1 are denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate. Regarding the power receiving terminal 2A, the same components as those of the power receiving terminal 2 are denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate.

　無線給電システム３Ａは、複数（図７の例では２つ）の受電回路２１の各々から、複数（図７の例では２つ）の送電回路１１のうち対応する送電回路１１へ無線信号Ｗ２を送信するように構成されている。 The wireless power supply system 3A is configured to transmit a wireless signal W2 from each of a plurality of (two in the example of FIG. 7) power receiving circuits 21 to a corresponding one of a plurality of (two in the example of FIG. 7) power transmitting circuits 11.

　複数の送電回路１１の各々は、第１通信回路１６（図８参照）を更に含む。複数の受電回路２１の各々は、第２通信回路２６（図９参照）を更に含む。各第１通信回路１６は、第１アンテナを有する。各第２通信回路２６は、第２アンテナを有する。受電端末２Ａは、複数の受電回路２１それぞれの第２通信回路２６から、複数の送電回路１１それぞれの第１通信回路１６へ無線信号Ｗ２を送信する。コントローラ１２は、複数の第１通信回路１６から、複数の受電回路２１それぞれの出力電圧の情報を取得する。コントローラ１２は、複数の受電回路２１それぞれの出力電圧の情報に基づいて、送電回路１１のＤＣ－ＡＣ変換回路１１０（図８参照）を制御することで送電電波の電力を制御する。 Each of the multiple power transmitting circuits 11 further includes a first communication circuit 16 (see FIG. 8). Each of the multiple power receiving circuits 21 further includes a second communication circuit 26 (see FIG. 9). Each first communication circuit 16 has a first antenna. Each second communication circuit 26 has a second antenna. The power receiving terminal 2A transmits a wireless signal W2 from the second communication circuit 26 of each of the multiple power receiving circuits 21 to the first communication circuit 16 of each of the multiple power transmitting circuits 11. The controller 12 acquires information about the output voltage of each of the multiple power receiving circuits 21 from the multiple first communication circuits 16. The controller 12 controls the power of the transmission radio waves by controlling the DC-AC conversion circuit 110 (see FIG. 8) of the power transmitting circuit 11 based on the information about the output voltage of each of the multiple power receiving circuits 21.

　複数の受電回路２１の各々は、受電回路２１の出力電圧を測定する電圧測定回路２２（図９参照）を有する。電圧測定回路２２は、例えば、抵抗分圧回路である。第２通信回路２６は、電圧測定回路２２による測定電圧値のデータを受電回路２１の出力電圧として含む無線信号Ｗ２を第１通信回路１６へ送信する。 Each of the multiple power receiving circuits 21 has a voltage measurement circuit 22 (see Figure 9) that measures the output voltage of the power receiving circuit 21. The voltage measurement circuit 22 is, for example, a resistive voltage divider circuit. The second communication circuit 26 transmits a wireless signal W2 to the first communication circuit 16, which includes data on the voltage value measured by the voltage measurement circuit 22 as the output voltage of the power receiving circuit 21.

　実施形態２に係る無線給電システム３Ａでは、コントローラ１２は、受電コイル２０毎に、所定の送電電波の周波数（以下、送電周波数ともいう）で受電回路２１の出力電圧が所定値になる送電電力を求めた後に、送電を開始させる。より詳細には、コントローラ１２は、送電電力を決定する第１ステップと、第１ステップの後に送電を継続させる第２ステップと、を実行する。 In the wireless power supply system 3A according to the second embodiment, the controller 12 determines, for each receiving coil 20, the transmission power at which the output voltage of the receiving circuit 21 becomes a predetermined value at a predetermined frequency of the power transmission radio wave (hereinafter also referred to as the power transmission frequency), and then starts power transmission. More specifically, the controller 12 executes a first step of determining the transmission power, and a second step of continuing power transmission after the first step.

　コントローラ１２は、第１ステップでは、送電電波の周波数を所定の送電周波数ｆｉ（ｉ＝１，２，・・・）に固定して、各送電コイル１０からの送電電力を変えて送電させ（試験送電）、受電回路２１の出力電圧が所定の直流電圧になる送電電力Ｐｉ（ｉ＝１，２，・・・）を求める。 In the first step, the controller 12 fixes the frequency of the transmission radio waves to a predetermined transmission frequency fi (i = 1, 2, ...), changes the transmission power from each transmission coil 10, and transmits power (test power transmission), thereby determining the transmission power Pi (i = 1, 2, ...) at which the output voltage of the power receiving circuit 21 becomes a predetermined DC voltage.

　コントローラ１２は、第２ステップでは、送電電波の周波数をｆｉ、送電電力をＰｉとして各送電コイル１０から送電を開始させる。 In the second step, the controller 12 starts power transmission from each power transmission coil 10 with the frequency of the power transmission radio waves set to fi and the transmission power set to Pi.

　コントローラ１２は、送電電波の周波数をｆ１、送電電力をＰ１と決定した場合には、第１送電コイル１０ａから送電を開始させる。コントローラ１２は、送電電波の周波数をｆ２、送電電力をＰ２と決定した場合には、第２送電コイル１０ｂから送電を開始させる。 When the controller 12 determines that the frequency of the transmission radio waves is f1 and the transmission power is P1, it starts transmission from the first transmission coil 10a. When the controller 12 determines that the frequency of the transmission radio waves is f2 and the transmission power is P2, it starts transmission from the second transmission coil 10b.

　コントローラ１２は、各送電コイル１０からの送電電波の周波数ｆｉ（ｉ＝１，２，・・・）を全て同じ周波数（予め設定された周波数）としてもよい。これにより、例えば、送電電波の周波数を送電回路１１の電力効率が高い周波数に設定することで、送電器１での電力損失を低減でき、発熱を小さくできる。 The controller 12 may set all of the frequencies fi (i = 1, 2, ...) of the power transmission radio waves from each power transmission coil 10 to the same frequency (a preset frequency). This allows, for example, the power loss in the power transmitter 1 to be reduced and heat generation to be minimized by setting the frequency of the power transmission radio waves to a frequency that provides high power efficiency for the power transmission circuit 11.

　（２）利点
　実施形態２に係る無線給電システム３Ａは、受電端末２Ａでの受電電力の大電力化及び電力効率を向上させることが可能となる。 (2) Advantages The wireless power feeding system 3A according to the second embodiment makes it possible to increase the received power and improve the power efficiency at the power receiving terminal 2A.

　また、実施形態２に係る無線給電システム３Ａでは、受電端末２Ａの複数の受電回路２１毎に複数の送電回路１１のうち対応する送電回路１１と通信可能となる。 Furthermore, in the wireless power supply system 3A according to the second embodiment, each of the multiple power receiving circuits 21 of the power receiving terminal 2A can communicate with a corresponding one of the multiple power transmitting circuits 11.

　（実施形態３）
　実施形態３に係る無線給電システム３Ａの基本構成は、実施形態２に係る無線給電システム３Ａ（図７参照）の構成と同じなので、図示及び説明を省略する。 (Embodiment 3)
The basic configuration of the wireless power feeding system 3A according to the third embodiment is the same as the configuration of the wireless power feeding system 3A according to the second embodiment (see FIG. 7), and therefore will not be illustrated or described.

　（１）構成
　実施形態３では、複数の送電回路１１の各々は、図１０に示すように、ＤＣ－ＡＣ変換回路１１０と、電圧測定回路１３（以下、第１電圧測定回路１３ともいう）と、電流測定回路１４（以下、第１電流測定回路１４ともいう）と、第１通信回路１６と、を含む。電圧測定回路１３は、送電回路１１の入力電圧を測定する。第１電流測定回路１４は、送電回路１１の入力電流を測定する。 (1) Configuration In the third embodiment, as shown in Fig. 10 , each of the multiple power transmitting circuits 11 includes a DC-AC conversion circuit 110, a voltage measurement circuit 13 (hereinafter also referred to as a first voltage measurement circuit 13), a current measurement circuit 14 (hereinafter also referred to as a first current measurement circuit 14), and a first communication circuit 16. The voltage measurement circuit 13 measures the input voltage of the power transmitting circuit 11. The first current measurement circuit 14 measures the input current of the power transmitting circuit 11.

　第１電圧測定回路１３は、例えば、第１抵抗分圧回路を含む。第１電流測定回路１４は、例えば、第１電流検出用抵抗を含む。第１通信回路１６は、第１アンテナを有する。 The first voltage measurement circuit 13 includes, for example, a first resistor voltage divider circuit. The first current measurement circuit 14 includes, for example, a first current detection resistor. The first communication circuit 16 has a first antenna.

　複数の受電回路２１の各々は、図１１に示すように、整流回路２１１と、電圧測定回路２２（以下、第２電圧測定回路２２ともいう）と、電流測定回路２３（以下、第２電流測定回路２３ともいう）と、第２通信回路２６と、を含む。 As shown in FIG. 11, each of the multiple power receiving circuits 21 includes a rectifier circuit 211, a voltage measurement circuit 22 (hereinafter also referred to as the second voltage measurement circuit 22), a current measurement circuit 23 (hereinafter also referred to as the second current measurement circuit 23), and a second communication circuit 26.

　電圧測定回路２２は、受電回路２１の出力電圧を測定する。電流測定回路２３は受電回路２１の出力電流を測定する。 The voltage measurement circuit 22 measures the output voltage of the power receiving circuit 21. The current measurement circuit 23 measures the output current of the power receiving circuit 21.

　第２電圧測定回路２２は、例えば、第２抵抗分圧回路を含む。第２電流測定回路２３は、例えば、第２電流検出用抵抗を含む。第２通信回路２６は、第２アンテナを有する。 The second voltage measurement circuit 22 includes, for example, a second resistive voltage divider circuit. The second current measurement circuit 23 includes, for example, a second current detection resistor. The second communication circuit 26 has a second antenna.

　複数の受電回路２１の各々は、第２通信回路２６から複数の送電回路１１のうち対応する送電回路１１の第１通信回路１６へ、第２電圧測定回路２２の測定電圧値のデータと第２電流測定回路２３の測定電流値のデータとを含む無線信号を送信する。 Each of the multiple power receiving circuits 21 transmits a wireless signal including data on the measured voltage value of the second voltage measuring circuit 22 and data on the measured current value of the second current measuring circuit 23 from the second communication circuit 26 to the first communication circuit 16 of the corresponding power transmitting circuit 11 among the multiple power transmitting circuits 11.

　コントローラ１２は、第１電圧測定回路１３から取得した測定電圧値のデータと第１電流測定回路１４から取得した測定電流値のデータとを用いて入力電力を計算する。コントローラ１２は、第２通信回路２６から第１通信回路１６へ送信された測定電圧値のデータ及び測定電流値のデータを用いて出力電力を計算する。コントローラ１２は、入力電力と出力電力とを用いて電力効率を計算する。より詳細には、コントローラ１２は、電力効率＝（出力電力／入力電力）×１００の演算式により電力効率を演算する。コントローラ１２は、電力効率が最大となるように送電電波の周波数を制御する。 The controller 12 calculates the input power using the measured voltage value data obtained from the first voltage measurement circuit 13 and the measured current value data obtained from the first current measurement circuit 14. The controller 12 calculates the output power using the measured voltage value data and measured current value data transmitted from the second communication circuit 26 to the first communication circuit 16. The controller 12 calculates the power efficiency using the input power and output power. More specifically, the controller 12 calculates the power efficiency using the formula: power efficiency = (output power / input power) x 100. The controller 12 controls the frequency of the transmission radio waves to maximize the power efficiency.

　実施形態３に係る無線給電システム３Ａでは、コントローラ１２は、受電コイル２０毎に、電力効率が最大となる周波数を決定し、受電回路２１の出力電圧が所定値になる電力を求めた後に、送電を開始させる。より詳細には、コントローラ１２は、送電電波の周波数（以下、送電周波数ともいう）を決定する第１ステップと、第１ステップの後に送電電力を決定する第２ステップと、第２ステップの後に送電を継続させる第３ステップと、を実行する。 In the wireless power supply system 3A according to the third embodiment, the controller 12 determines the frequency at which power efficiency is maximized for each receiving coil 20, and starts power transmission after determining the power at which the output voltage of the receiving circuit 21 becomes a predetermined value. More specifically, the controller 12 executes a first step of determining the frequency of the power transmission radio waves (hereinafter also referred to as the power transmission frequency), a second step of determining the power to be transmitted after the first step, and a third step of continuing power transmission after the second step.

　コントローラ１２は、第１ステップでは、送電電波の電力を所定の値に固定して、各送電コイル１０からの送電周波数を変え、電力効率を演算し、コイルペア毎に電力効率が最大となる周波数ｆｉ（ｉ＝１，２，・・・）を求める。 In the first step, the controller 12 fixes the power of the transmission radio waves to a predetermined value, changes the transmission frequency from each transmission coil 10, calculates the power efficiency, and determines the frequency f i (i = 1, 2, ...) at which the power efficiency is maximized for each coil pair.

　コントローラ１２は、第２ステップでは、各送電コイル１０の送電周波数を第１ステップで求めた周波数ｆｉに固定して、各送電コイル１０からの送電電力を変えて送電させ（試験送電）、受電回路２１の出力電圧が所定の直流電圧になる送電電力Ｐｉ（ｉ＝１，２，・・・）を求める。 In the second step, the controller 12 fixes the transmission frequency of each transmitting coil 10 to the frequency fi determined in the first step, and transmits power by changing the transmission power from each transmitting coil 10 (test transmission), thereby determining the transmission power Pi (i = 1, 2, ...) at which the output voltage of the receiving circuit 21 becomes a predetermined DC voltage.

　コントローラ１２は、第３ステップでは、送電電波の周波数をｆｉ、送電電力をＰｉとして各送電コイル１０から送電を開始させる。なお、コントローラ１２は、送電電波の周波数をｆ１、送電電力をＰ１と決定した場合には、第１送電コイル１０ａから送電を開始させる。送電電波の周波数をｆ２、送電電力をＰ２と決定した場合には、第２送電コイル１０ｂから送電を開始させる。 In the third step, the controller 12 starts power transmission from each power transmission coil 10 with the frequency of the power transmission radio wave as f i and the transmission power as P i . When the controller 12 determines that the frequency of the power transmission radio wave is f 1 and the transmission power is P 1 , it starts power transmission from the first power transmission coil 10 a. When the controller 12 determines that the frequency of the power transmission radio wave is f 2 and the transmission power is P 2 , it starts power transmission from the second power transmission coil 10 b.

　（２）利点
　実施形態３に係る無線給電システム３Ａは、実施形態２に係る無線給電システム３Ａと同様、受電端末２Ａでの受電電力の大電力化及び電力効率を向上させることが可能となる。 (2) Advantages Like the wireless power feeding system 3A according to the second embodiment, the wireless power feeding system 3A according to the third embodiment can increase the received power and improve the power efficiency at the power receiving terminal 2A.

　また、実施形態３に係る無線給電システム３Ａでは、コントローラ１２は、電力効率が最大となるように送電電波の周波数を制御する。これにより、実施形態３に係る無線給電システム３Ａは、電力効率を最大化できるので、送電電力を低減でき、消費電力を低下させることができる。 Furthermore, in the wireless power supply system 3A according to embodiment 3, the controller 12 controls the frequency of the power transmission radio waves so as to maximize power efficiency. As a result, the wireless power supply system 3A according to embodiment 3 can maximize power efficiency, thereby reducing the power transmission and power consumption.

　（実施形態４）
　以下、実施形態４に係る無線給電システム３Ｂについて、図１２～図１４に基づいて説明する。実施形態４に係る無線給電システム３Ｂに関し、実施形態２に係る無線給電システム３Ａと同様の構成要素については、同一の符号を付して説明を適宜省略する。 (Embodiment 4)
A wireless power feeding system 3B according to the fourth embodiment will be described below with reference to Fig. 12 to Fig. 14. Regarding the wireless power feeding system 3B according to the fourth embodiment, the same components as those of the wireless power feeding system 3A according to the second embodiment will be denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

　（１）構成
　無線給電システム３Ｂは、図１２に示すように、実施形態２に係る送電器１Ａ及び受電端末２Ａの代わりに、送電器１Ｂ及び受電端末２Ｂを備える点で、実施形態２に係る無線給電システム３Ａと相違する。送電器１Ｂに関し、送電器１Ａと同様の構成要素には同一の符号を付して説明を適宜省略する。また、受電端末２Ｂに関し、受電端末２Ａと同様の構成要素には同一の符号を付して説明を適宜省略する。 (1) Configuration As shown in Fig. 12 , the wireless power feeding system 3B differs from the wireless power feeding system 3A according to the second embodiment in that it includes a power transmitter 1B and a power receiving terminal 2B instead of the power transmitter 1A and the power receiving terminal 2A according to the second embodiment. Regarding the power transmitter 1B, components similar to those of the power transmitter 1A are denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate. Regarding the power receiving terminal 2B, components similar to those of the power receiving terminal 2A are denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate.

　無線給電システム３Ｂは、例えば、図１２に示すように、第１送電回路１１ａと第１受電回路２１ａとの間で無線通信を行い、第２送電回路１１ｂと第２受電回路２１ｂとの間で無線通信を行う点で、実施形態１に係る無線給電システム３と相違する。なお、図１２では、第１受電コイル２０ａから第１送電コイル１０ａに向かっている破線矢印が、第１受電回路２１ａの出力電圧の情報を含む無線信号Ｗ２ａを示している。また、図１２では、第２受電コイル２０ｂから第２送電コイル１０ｂに向かっている破線矢印が、第２受電回路２１ｂの出力電圧の情報を含む無線信号Ｗ２ｂを示している。 As shown in FIG. 12, the wireless power supply system 3B differs from the wireless power supply system 3 according to embodiment 1 in that wireless communication is performed between the first power transmission circuit 11a and the first power receiving circuit 21a, and between the second power transmission circuit 11b and the second power receiving circuit 21b. In FIG. 12, the dashed arrow pointing from the first power receiving coil 20a to the first power transmitting coil 10a indicates a wireless signal W2a containing information about the output voltage of the first power receiving circuit 21a. In FIG. 12, the dashed arrow pointing from the second power receiving coil 20b to the second power transmitting coil 10b indicates a wireless signal W2b containing information about the output voltage of the second power receiving circuit 21b.

　本実施形態では、複数の送電回路１１の各々は、図１３に示すように、復調回路１７を含む。復調回路１７は、対応する送電コイル１０を介して無線信号Ｗ２を受信するための回路である。より詳細には、復調回路１７は、無線信号Ｗ２を復調する復調機能を有する。 In this embodiment, as shown in FIG. 13, each of the multiple power transmission circuits 11 includes a demodulation circuit 17. The demodulation circuit 17 is a circuit for receiving the wireless signal W2 via the corresponding power transmission coil 10. More specifically, the demodulation circuit 17 has a demodulation function for demodulating the wireless signal W2.

　複数の受電回路２１の各々は、図１４に示すように、変調回路２７を含む。変調回路２７は、対応する受電コイル２０を介して無線信号Ｗ２を送信するための回路である。より詳細には、変調回路２７は、無線信号Ｗ２を変調する変調機能を有する。 As shown in FIG. 14, each of the multiple power receiving circuits 21 includes a modulation circuit 27. The modulation circuit 27 is a circuit for transmitting a wireless signal W2 via the corresponding power receiving coil 20. More specifically, the modulation circuit 27 has a modulation function for modulating the wireless signal W2.

　（２）利点
　実施形態４に係る無線給電システム３Ｂは、実施形態２に係る無線給電システム３Ａと同様、受電端末２Ｂでの受電電力の大電力化及び電力効率を向上させることが可能となる。 (2) Advantages Like the wireless power feeding system 3A according to the second embodiment, the wireless power feeding system 3B according to the fourth embodiment can increase the received power and improve the power efficiency at the power receiving terminal 2B.

　また、実施形態４に係る無線給電システム３Ｂは、複数の送電コイル１０及び複数の受電コイル２０の各々を通信用のアンテナとして兼用することが可能となる。 Furthermore, the wireless power supply system 3B according to embodiment 4 allows each of the multiple power transmitting coils 10 and the multiple power receiving coils 20 to also serve as a communication antenna.

　（実施形態５）
　実施形態５に係る無線給電システム３Ｂの基本構成は、実施形態４に係る無線給電システム３Ｂ（図１２参照）の構成と同じなので、図示及び説明を省略する。 (Embodiment 5)
The basic configuration of the wireless power feeding system 3B according to the fifth embodiment is the same as the configuration of the wireless power feeding system 3B according to the fourth embodiment (see FIG. 12), and therefore will not be illustrated or described.

　（１）構成
　実施形態５では、複数の送電回路１１の各々は、図１５に示すように、ＤＣ－ＡＣ変換回路１１０と、電圧測定回路１３（以下、第１電圧測定回路１３ともいう）と、電流測定回路１４（以下、第１電流測定回路１４ともいう）と、復調回路１７と、を含む。電圧測定回路１３は、送電回路１１の入力電圧を測定する。第１電流測定回路１４は、送電回路１１の入力電流を測定する。 (1) Configuration In the fifth embodiment, as shown in FIG. 15 , each of the multiple power transmitting circuits 11 includes a DC-AC conversion circuit 110, a voltage measurement circuit 13 (hereinafter also referred to as a first voltage measurement circuit 13), a current measurement circuit 14 (hereinafter also referred to as a first current measurement circuit 14), and a demodulation circuit 17. The voltage measurement circuit 13 measures the input voltage of the power transmitting circuit 11. The first current measurement circuit 14 measures the input current of the power transmitting circuit 11.

　第１電圧測定回路１３は、例えば、第１抵抗分圧回路を含む。第１電流測定回路１４は、例えば、第１電流検出用抵抗を含む。 The first voltage measurement circuit 13 includes, for example, a first resistor voltage divider circuit. The first current measurement circuit 14 includes, for example, a first current detection resistor.

　複数の受電回路２１の各々は、図１６に示すように、整流回路２１１と、電圧測定回路２２（以下、第２電圧測定回路２２ともいう）と、電流測定回路２３（以下、第２電流測定回路２３ともいう）と、変調回路２７と、を含む。 As shown in FIG. 16, each of the multiple power receiving circuits 21 includes a rectifier circuit 211, a voltage measurement circuit 22 (hereinafter also referred to as the second voltage measurement circuit 22), a current measurement circuit 23 (hereinafter also referred to as the second current measurement circuit 23), and a modulation circuit 27.

　電圧測定回路２２は、受電回路２１の出力電圧を測定する。電流測定回路２３は、受電回路２１の出力電流を測定する。 The voltage measurement circuit 22 measures the output voltage of the power receiving circuit 21. The current measurement circuit 23 measures the output current of the power receiving circuit 21.

　第２電圧測定回路２２は、例えば、第２抵抗分圧回路を含む。第２電流測定回路２３は、例えば、第２電流検出用抵抗を含む。 The second voltage measurement circuit 22 includes, for example, a second resistive voltage divider circuit. The second current measurement circuit 23 includes, for example, a second current detection resistor.

　複数の受電回路２１の各々は、変調回路２７から複数の送電回路１１のうち対応する送電回路１１の復調回路１７へ、第２電圧測定回路２２の測定電圧値のデータと第２電流測定回路２３の測定電流値のデータとを含む無線信号Ｗ２を送信する。 Each of the multiple power receiving circuits 21 transmits a wireless signal W2 containing data on the measured voltage value of the second voltage measuring circuit 22 and data on the measured current value of the second current measuring circuit 23 from the modulation circuit 27 to the demodulation circuit 17 of the corresponding power transmitting circuit 11 among the multiple power transmitting circuits 11.

　コントローラ１２は、第１電圧測定回路１３から取得した測定電圧値のデータと第１電流測定回路１４から取得した測定電流値のデータとを用いて、送電回路１１への入力電力を計算する。コントローラ１２は、変調回路２７から復調回路１７へ送信された測定電圧値のデータ及び測定電流値のデータを用いて受電回路２１の出力電力を計算する。コントローラ１２は、入力電力と出力電力とを用いて電力効率を計算する。より詳細には、コントローラ１２は、電力効率＝（出力電力／入力電力）×１００の演算式により電力効率を演算する。コントローラ１２は、電力効率が最大となるように送電電波の周波数を制御する。 The controller 12 calculates the input power to the power transmission circuit 11 using the measured voltage value data obtained from the first voltage measurement circuit 13 and the measured current value data obtained from the first current measurement circuit 14. The controller 12 calculates the output power of the power receiving circuit 21 using the measured voltage value data and measured current value data sent from the modulation circuit 27 to the demodulation circuit 17. The controller 12 calculates the power efficiency using the input power and output power. More specifically, the controller 12 calculates the power efficiency using the formula: power efficiency = (output power / input power) x 100. The controller 12 controls the frequency of the power transmission radio waves to maximize power efficiency.

　（２）利点
　実施形態５に係る無線給電システム３Ｂは、実施形態４に係る無線給電システム３Ｂと同様、受電端末２Ｂでの受電電力の大電力化及び電力効率を向上させることが可能となる。 (2) Advantages Like the wireless power feeding system 3B according to the fourth embodiment, the wireless power feeding system 3B according to the fifth embodiment can increase the received power and improve the power efficiency at the power receiving terminal 2B.

　また、実施形態５に係る無線給電システム３Ｂでは、実施形態３に係る無線給電システム３Ａと同様、コントローラ１２は、電力効率が最大となるように送電電波の周波数を制御する。これにより、実施形態５に係る無線給電システム３Ｂは、電力効率を最大化できるので、送電電力を低減でき、消費電力を低下させることができる。 Furthermore, in the wireless power feeding system 3B according to embodiment 5, similar to the wireless power feeding system 3A according to embodiment 3, the controller 12 controls the frequency of the power transmission radio waves to maximize power efficiency. As a result, the wireless power feeding system 3B according to embodiment 5 can maximize power efficiency, thereby reducing the power transmission and power consumption.

　（実施形態６）
　以下、実施形態６に係る無線給電システム３Ｃについて、図１７～図１９に基づいて説明する。実施形態６に係る無線給電システム３Ｃに関し、実施形態１に係る無線給電システム３と同様の構成要素については、同一の符号を付して説明を適宜省略する。 (Embodiment 6)
A wireless power feeding system 3C according to the sixth embodiment will be described below with reference to Fig. 17 to Fig. 19. Regarding the wireless power feeding system 3C according to the sixth embodiment, the same components as those in the wireless power feeding system 3 according to the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

　（１）構成
　無線給電システム３Ｃは、図１７に示すように、実施形態１に係る送電器１及び受電端末２の代わりに、送電器１Ｃ及び受電端末２Ｃを備える点で、実施形態１に係る無線給電システム３と相違する。 (1) Configuration As shown in FIG. 17 , the wireless power supply system 3C differs from the wireless power supply system 3 according to the first embodiment in that the wireless power supply system 3C includes a power transmitter 1C and a power receiving terminal 2C instead of the power transmitter 1 and the power receiving terminal 2 according to the first embodiment.

　送電器１Ｃは、図１７及び図１８に示すように、複数（図１７の例では２つ）の送電コイル１０と、複数（図１７の例では２つ）の送電回路１１と、コントローラ１２と、電源回路１９と、第１通信回路１６と、を有する。第１通信回路１６は、第１アンテナを有する。 As shown in Figures 17 and 18, the power transmitter 1C has multiple (two in the example of Figure 17) power transmission coils 10, multiple (two in the example of Figure 17) power transmission circuits 11, a controller 12, a power supply circuit 19, and a first communication circuit 16. The first communication circuit 16 has a first antenna.

　受電端末２Ｃは、図１７及び図１９に示すように、複数（図１７の例では２つ）の受電コイル２０と、複数（図１７の例では２つ）の受電回路２１と、第２通信回路２６と、を有する。第２通信回路２６は、第２アンテナを有する。 As shown in Figures 17 and 19, the power receiving terminal 2C has multiple (two in the example of Figure 17) power receiving coils 20, multiple (two in the example of Figure 17) power receiving circuits 21, and a second communication circuit 26. The second communication circuit 26 has a second antenna.

　本実施形態の受電端末２Ｃでは、第２通信回路２６が、複数の受電回路２１それぞれの電圧測定回路２２から受電回路２１の出力電圧の測定値を取得し、各受電回路２１それぞれの出力電圧の情報を含む無線信号Ｗ２を第１通信回路１６へ送信する。 In the power receiving terminal 2C of this embodiment, the second communication circuit 26 acquires the measured output voltage of each of the multiple power receiving circuits 21 from the voltage measurement circuit 22 of each of the power receiving circuits 21, and transmits a wireless signal W2 containing information about the output voltage of each of the power receiving circuits 21 to the first communication circuit 16.

　送電器１Ｃでは、コントローラ１２が第１通信回路１６から各受電回路２１それぞれの出力電圧の情報を取得し、各送電回路１１を制御する。 In the power transmitter 1C, the controller 12 obtains information about the output voltage of each power receiving circuit 21 from the first communication circuit 16 and controls each power transmitting circuit 11.

　（２）利点
　実施形態６に係る無線給電システム３Ｃは、実施形態１に係る無線給電システム３と同様、受電端末２Ｃでの受電電力の大電力化及び電力効率を向上させることが可能となる。 (2) Advantages Like the wireless power feeding system 3 according to the first embodiment, the wireless power feeding system 3C according to the sixth embodiment can increase the received power and improve the power efficiency at the power receiving terminal 2C.

　また、実施形態６に係る無線給電システム３Ｃでは、第１通信回路１６及び第２通信回路２６を１つずつ有していればよいので、送電器１Ｃ及び受電端末２Ｃそれぞれの小型化を図ることが可能となるとともに、低コスト化を図ることが可能となる。 Furthermore, the wireless power supply system 3C according to the sixth embodiment only requires one first communication circuit 16 and one second communication circuit 26, which makes it possible to reduce the size and cost of the power transmitter 1C and the power receiving terminal 2C.

　（実施形態７）
　実施形態７に係る無線給電システム３Ｃの基本構成は、実施形態６に係る無線給電システム３Ｃ（図１７参照）の構成と同じなので、図示及び説明を省略する。 (Embodiment 7)
The basic configuration of the wireless power feeding system 3C according to the seventh embodiment is the same as the configuration of the wireless power feeding system 3C according to the sixth embodiment (see FIG. 17), and therefore will not be illustrated or described.

　（１）構成
　実施形態７では、複数の送電回路１１の各々は、図２０に示すように、ＤＣ－ＡＣ変換回路１１０と、電圧測定回路１３（以下、第１電圧測定回路１３ともいう）と、電流測定回路１４（以下、第１電流測定回路１４ともいう）と、を含む。電圧測定回路１３は、送電回路１１の入力電圧を測定する。第１電流測定回路１４は、送電回路１１の入力電流を測定する。 (1) Configuration In the seventh embodiment, each of the multiple power transmitting circuits 11 includes a DC-AC conversion circuit 110, a voltage measurement circuit 13 (hereinafter also referred to as a first voltage measurement circuit 13), and a current measurement circuit 14 (hereinafter also referred to as a first current measurement circuit 14), as shown in Fig. 20. The voltage measurement circuit 13 measures the input voltage of the power transmitting circuit 11. The first current measurement circuit 14 measures the input current of the power transmitting circuit 11.

　第１電圧測定回路１３は、例えば、第１抵抗分圧回路を含む。第１電流測定回路１４は、例えば、第１電流検出用抵抗を含む。 The first voltage measurement circuit 13 includes, for example, a first resistor voltage divider circuit. The first current measurement circuit 14 includes, for example, a first current detection resistor.

　複数の受電回路２１の各々は、図２１に示すように、整流回路２１１と、電圧測定回路２２（以下、第２電圧測定回路２２ともいう）と、電流測定回路２３（以下、第２電流測定回路２３ともいう）と、を含む。 As shown in FIG. 21, each of the multiple power receiving circuits 21 includes a rectifier circuit 211, a voltage measurement circuit 22 (hereinafter also referred to as a second voltage measurement circuit 22), and a current measurement circuit 23 (hereinafter also referred to as a second current measurement circuit 23).

　電圧測定回路２２は、受電回路２１の出力電圧を測定する。電流測定回路２３は、受電回路２１の出力電流を測定する。 The voltage measurement circuit 22 measures the output voltage of the power receiving circuit 21. The current measurement circuit 23 measures the output current of the power receiving circuit 21.

　第２電圧測定回路２２は、例えば、第２抵抗分圧回路を含む。第２電流測定回路２３は、例えば、第２電流検出用抵抗を含む。 The second voltage measurement circuit 22 includes, for example, a second resistive voltage divider circuit. The second current measurement circuit 23 includes, for example, a second current detection resistor.

　受電端末２Ｃは、第２通信回路２６から第１通信回路１６へ、第２電圧測定回路２２の測定電圧値のデータと第２電流測定回路２３の測定電流値のデータとを含む無線信号Ｗ２を送信する。 The power receiving terminal 2C transmits a wireless signal W2 from the second communication circuit 26 to the first communication circuit 16, the wireless signal W2 including data on the measured voltage value from the second voltage measurement circuit 22 and data on the measured current value from the second current measurement circuit 23.

　コントローラ１２は、第１電圧測定回路１３から取得した測定電圧値のデータと第１電流測定回路１４から取得した測定電流値のデータとを用いて入力電力を計算する。コントローラ１２は、第２通信回路２６から第１通信回路１６へ送信された測定電圧値のデータ及び測定電流値のデータを用いて出力電力を計算する。コントローラ１２は、入力電力と出力電力とを用いて電力効率を計算する。より詳細には、コントローラ１２は、電力効率＝（出力電力／入力電力）×１００の演算式により電力効率を演算する。コントローラ１２は、電力効率が最大となるように送電電波の周波数を制御する。 The controller 12 calculates the input power using the measured voltage value data obtained from the first voltage measurement circuit 13 and the measured current value data obtained from the first current measurement circuit 14. The controller 12 calculates the output power using the measured voltage value data and measured current value data transmitted from the second communication circuit 26 to the first communication circuit 16. The controller 12 calculates the power efficiency using the input power and output power. More specifically, the controller 12 calculates the power efficiency using the formula: power efficiency = (output power / input power) x 100. The controller 12 controls the frequency of the transmission radio waves to maximize the power efficiency.

　（２）利点
　実施形態７に係る無線給電システム３Ｃは、実施形態６に係る無線給電システム３Ｃと同様、受電端末２Ｃでの受電電力の大電力化及び電力効率を向上させることが可能となる。 (2) Advantages Like the wireless power feeding system 3C according to the sixth embodiment, the wireless power feeding system 3C according to the seventh embodiment makes it possible to increase the received power and improve the power efficiency at the power receiving terminal 2C.

　また、実施形態７に係る無線給電システム３Ｃでは、実施形態３に係る無線給電システム３Ａと同様、コントローラ１２は、電力効率が最大となるように送電電波の周波数を制御する。これにより、実施形態７に係る無線給電システム３Ｃは、電力効率を最大化できるので、送電電力を低減でき、消費電力を低下させることができる。 Furthermore, in the wireless power feeding system 3C according to embodiment 7, similar to the wireless power feeding system 3A according to embodiment 3, the controller 12 controls the frequency of the power transmission radio waves to maximize power efficiency. As a result, the wireless power feeding system 3C according to embodiment 7 can maximize power efficiency, thereby reducing the power transmission and power consumption.

　（実施形態８）
　以下、実施形態８に係る無線給電システム３Ｄについて、図２２及び図２３に基づいて説明する。実施形態８に係る無線給電システム３Ｄに関し、実施形態１に係る無線給電システム３（図１参照）と同様の構成要素については、同一の符号を付して説明を適宜省略する。 (Embodiment 8)
A wireless power feeding system 3D according to the eighth embodiment will be described below with reference to Fig. 22 and Fig. 23. Regarding the wireless power feeding system 3D according to the eighth embodiment, the same components as those of the wireless power feeding system 3 according to the first embodiment (see Fig. 1) are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

　（１）構成
　無線給電システム３Ｄは、図２２に示すように、実施形態１に係る受電端末２の代わりに、受電端末２Ｄを備える点で、実施形態１に係る無線給電システム３と相違する。 (1) Configuration As shown in FIG. 22, a wireless power feeding system 3D differs from the wireless power feeding system 3 according to the first embodiment in that a power receiving terminal 2D is provided instead of the power receiving terminal 2 according to the first embodiment.

　受電端末２Ｄは、複数（図２２では２つ）の受電回路２１に一対一に対応する複数（図２２では２つ）のダイオード回路２５を更に有する点で、受電端末２と相違する。 The power receiving terminal 2D differs from the power receiving terminal 2 in that it further includes multiple (two in FIG. 22) diode circuits 25 that correspond one-to-one to multiple (two in FIG. 22) power receiving circuits 21.

　複数のダイオード回路２５の各々は、図２３に示すように、受電回路２１の高電位側の出力端にアノードが接続された第１ダイオードＤ２５と、受電回路２１の低電位側の出力端にカソードが接続された第２ダイオードＤ２６と、を有する。第１ダイオードＤ２５のカソードは、第１直流出力端子２４１（図２２参照）に接続されている。第２ダイオードＤ２６のアノードは、第２直流出力端子２４２（図２２参照）に接続されている。 As shown in FIG. 23, each of the multiple diode circuits 25 has a first diode D25 whose anode is connected to the high-potential output terminal of the power receiving circuit 21, and a second diode D26 whose cathode is connected to the low-potential output terminal of the power receiving circuit 21. The cathode of the first diode D25 is connected to the first DC output terminal 241 (see FIG. 22). The anode of the second diode D26 is connected to the second DC output terminal 242 (see FIG. 22).

　（２）利点
　実施形態８に係る無線給電システム３Ｄは、実施形態１に係る無線給電システム３と同様、受電端末２Ｄでの受電電力の大電力化及び電力効率を向上させることが可能となる。 (2) Advantages Like the wireless power feeding system 3 according to the first embodiment, the wireless power feeding system 3D according to the eighth embodiment can increase the received power and improve the power efficiency at the power receiving terminal 2D.

　また、実施形態８に係る無線給電システム３Ｄは、複数のダイオード回路２５を備えるので、コントローラ１２による複数の送電回路１１の制御性が低下した場合でも、複数の受電回路２１間で逆流が発生することを抑制することができる。 Furthermore, the wireless power supply system 3D according to embodiment 8 includes multiple diode circuits 25, so that backflow between multiple power receiving circuits 21 can be prevented even if the controllability of the multiple power transmitting circuits 11 by the controller 12 decreases.

　（３）実施形態８の変形例
　複数のダイオード回路２５の各々は、図２３の例に限らず、例えば、図２４に示すように、第１ダイオードＤ２５のみを有する構成であってもよい。 (3) Modification of the Eighth Embodiment Each of the plurality of diode circuits 25 is not limited to the example of FIG. 23, and may be configured to include only a first diode D25, as shown in FIG. 24, for example.

　（実施形態９）
　以下、実施形態９に係る無線給電システム３Ｅについて、図２５に基づいて説明する。実施形態９に係る無線給電システム３Ｅに関し、実施形態１に係る無線給電システム３（図１参照）と同様の構成要素については、同一の符号を付して説明を適宜省略する。 (Embodiment 9)
A wireless power feeding system 3E according to the ninth embodiment will be described below with reference to Fig. 25. Regarding the wireless power feeding system 3E according to the ninth embodiment, the same components as those of the wireless power feeding system 3 according to the first embodiment (see Fig. 1) are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

　（１）構成
　無線給電システム３Ｅは、図２５に示すように、実施形態１に係る受電端末２の代わりに、受電端末２Ｅを備える点で、実施形態１に係る無線給電システム３と相違する。 (1) Configuration As shown in FIG. 25 , a wireless power feeding system 3E differs from the wireless power feeding system 3 according to the first embodiment in that a power receiving terminal 2E is provided instead of the power receiving terminal 2 according to the first embodiment.

　受電端末２Ｅは、複数（図２５では２つ）の受電回路２１に一対一に対応する複数（図２５では２つ）の電圧調整回路２８を更に有する点で、受電端末２と相違する。２つの電圧調整回路２８は、第１電圧調整回路２８ａと、第２電圧調整回路２８ｂと、を含む。第１電圧調整回路２８ａは、第１受電回路２１ａの出力端間と直流出力部２４との間に接続されている。第２電圧調整回路２８ｂは、第２受電回路２１ｂの出力端間と直流出力部２４との間に接続されている。 The power receiving terminal 2E differs from the power receiving terminal 2 in that it further has multiple (two in FIG. 25) voltage adjustment circuits 28 that correspond one-to-one to multiple (two in FIG. 25) power receiving circuits 21. The two voltage adjustment circuits 28 include a first voltage adjustment circuit 28a and a second voltage adjustment circuit 28b. The first voltage adjustment circuit 28a is connected between the output terminals of the first power receiving circuit 21a and the DC output unit 24. The second voltage adjustment circuit 28b is connected between the output terminals of the second power receiving circuit 21b and the DC output unit 24.

　複数の電圧調整回路２８の各々は、例えば、ＤＣ－ＤＣコンバータである。 Each of the multiple voltage adjustment circuits 28 is, for example, a DC-DC converter.

　（２）利点
　実施形態９に係る無線給電システム３Ｅは、実施形態１に係る無線給電システム３と同様、受電端末２Ｅでの受電電力の大電力化及び電力効率を向上させることが可能となる。 (2) Advantages Like the wireless power feeding system 3 according to the first embodiment, the wireless power feeding system 3E according to the ninth embodiment can increase the received power and improve the power efficiency at the power receiving terminal 2E.

　また、実施形態９に係る無線給電システム３Ｅは、複数の電圧調整回路２８を備えるので、コントローラ１２による複数の送電回路１１の制御性が低下した場合でも、複数の受電回路２１間で逆流が発生することを抑制することができる。 Furthermore, the wireless power supply system 3E according to embodiment 9 includes multiple voltage adjustment circuits 28, so that backflow between multiple power receiving circuits 21 can be prevented even if the controllability of the multiple power transmitting circuits 11 by the controller 12 decreases.

　（実施形態１０）
　以下、実施形態１０に係る無線給電システム３の基本構成は、実施形態１に係る無線給電システム３と同じなので、図示及び説明を省略する。 (Embodiment 10)
Hereinafter, the basic configuration of the wireless power feeding system 3 according to the tenth embodiment is the same as that of the wireless power feeding system 3 according to the first embodiment, and therefore will not be illustrated or described again.

　実施形態１０では、コントローラ１２が移動システム５０を制御することで送電コイル１０を受電コイル２０に対向する位置に移動させるときに、図２６に示すように、送電コイル１０の巻回軸Ｂ１０と受電コイル２０の巻回軸Ｂ２０とを一致させる制御と、図２７に示すように、送電コイル１０の巻回軸Ｂ１０と受電コイル２０の巻回軸Ｂ２０とをずらす制御と、を行うように構成されている。図２８は、送電コイル１０と受電コイル２０との位置ずれをコイル半径で規格化した位置ずれ／コイル半径と電力効率との関係を示している。コイル半径は、送電コイル１０及び受電コイル２０の各々の半径である。本実施形態では、コントローラ１２が、位置ずれを変えることにより電力効率を変化させることができる。 In embodiment 10, when the controller 12 controls the movement system 50 to move the transmitting coil 10 to a position facing the receiving coil 20, the controller 12 is configured to perform control to align the winding axis B10 of the transmitting coil 10 with the winding axis B20 of the receiving coil 20, as shown in FIG. 26, and control to misalign the winding axis B10 of the transmitting coil 10 with the winding axis B20 of the receiving coil 20, as shown in FIG. 27. FIG. 28 shows the relationship between the misalignment/coil radius between the transmitting coil 10 and the receiving coil 20 normalized by the coil radius, and power efficiency. The coil radius is the radius of each of the transmitting coil 10 and the receiving coil 20. In this embodiment, the controller 12 can change the power efficiency by changing the misalignment.

　本実施形態では、コントローラ１２は、第１受電回路２１ａの出力電圧と第２受電回路２１ｂの出力電圧とが同じになるように、出力電圧が高いほうの受電回路２１に接続されている受電コイル２０に対する送電コイル１０の位置をずらして、送電コイル１０と受電コイル２０との間の結合を弱める。 In this embodiment, the controller 12 shifts the position of the power transmitting coil 10 relative to the power receiving coil 20 connected to the power receiving circuit 21 with the higher output voltage so that the output voltage of the first power receiving circuit 21a and the output voltage of the second power receiving circuit 21b are the same, thereby weakening the coupling between the power transmitting coil 10 and the power receiving coil 20.

　本実施形態では、図２９に示す無線給電システム３Ｆのように、送電回路１１が２つの場合、受電回路２１の出力電圧の調整の自由度が高くなる。図２９の送電器１Ｆでは、実施形態１の送電器１の移動システム５０を、２つの移動機構１８として記載してある。２つの移動機構１８は、第１送電コイル１０ａを移動させる第１移動機構１８ａと、第２送電コイル１０ｂを移動させる第２移動機構１８ｂと、を含む。 In this embodiment, when there are two power transmission circuits 11, as in the wireless power supply system 3F shown in Figure 29, the degree of freedom in adjusting the output voltage of the power receiving circuit 21 is increased. In the power transmitter 1F of Figure 29, the movement system 50 of the power transmitter 1 of embodiment 1 is depicted as two movement mechanisms 18. The two movement mechanisms 18 include a first movement mechanism 18a that moves the first power transmission coil 10a and a second movement mechanism 18b that moves the second power transmission coil 10b.

　また、図３０に示す変形例の無線給電システム３Ｇのように、送電コイル１０毎の周波数や電力を変更することができない、送電回路１１が１つで２つの送電コイル１０に分配している構成の送電器１Ｇに対して、位置ずれの制御により電力効率を変化させることで、２つの受電回路２１の互いの出力電圧が同じになるように調整することが可能となる。これにより、複数の受電回路２１間で逆流が発生することを抑制することができる。 Furthermore, in a power transmitter 1G configured with one power transmission circuit 11 distributing power to two power transmission coils 10, such as the modified wireless power supply system 3G shown in Figure 30, where the frequency and power cannot be changed for each power transmission coil 10, it is possible to adjust the output voltages of the two power receiving circuits 21 to be the same by changing the power efficiency through positional control. This makes it possible to prevent backflow between multiple power receiving circuits 21.

　（実施形態１１）
　以下、実施形態１１に係る無線給電システム３Ｈについて、図３１に基づいて説明する。実施形態１１に係る無線給電システム３Ｈに関し、実施形態７に係る無線給電システム３Ｃ（図１７参照）と同様の構成要素については、同一の符号を付して説明を適宜省略する。 (Embodiment 11)
Hereinafter, a wireless power feeding system 3H according to the eleventh embodiment will be described with reference to Fig. 31. Regarding the wireless power feeding system 3H according to the eleventh embodiment, the same components as those of the wireless power feeding system 3C according to the seventh embodiment (see Fig. 17) will be denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

　（１）構成
　無線給電システム３Ｈは、第２通信回路２６が、受電端末２Ｃの受電コイル２０の数を無線で第１通信回路１６へ無線信号で送信するように構成されている点で、実施形態７に係る無線給電システム３Ｃと相違する。 (1) Configuration The wireless power supply system 3H differs from the wireless power supply system 3C according to the seventh embodiment in that the second communication circuit 26 is configured to wirelessly transmit the number of the power receiving coils 20 of the power receiving terminal 2C to the first communication circuit 16 by wireless signal.

　（２）利点
　実施形態１１に係る無線給電システム３Ｈでは、上述の図６のフローチャートで説明したコントローラ１２の動作（制御アルゴリズム）において、ステップＳ１０が不要となり、制御アルゴリズムが簡略化され、受電端末２Ｃのバッテリの充電開始までの時間を短縮することが可能となる。また、上述の図３２に示した受電端末２Ｒについても、第２通信回路２６から送電器１Ｃの第１通信回路１６へ無線で受電コイル２０の数及び受電回路２１の出力電圧それぞれの情報を含む無線信号Ｗ２を送信するように構成されていてもよい。 (2) Advantages In the wireless power feeding system 3H according to the eleventh embodiment, step S10 is not required in the operation (control algorithm) of the controller 12 described in the flowchart of Fig. 6 above, the control algorithm is simplified, and it is possible to shorten the time until charging of the battery of the power receiving terminal 2C starts. Also, the power receiving terminal 2R shown in Fig. 32 above may be configured to wirelessly transmit a wireless signal W2 including information on the number of power receiving coils 20 and the output voltage of the power receiving circuit 21 from the second communication circuit 26 to the first communication circuit 16 of the power transmitter 1C.

　（その他の変形例）
　上記の実施形態１～１１等は、本開示の様々な実施形態の一つに過ぎない。上記の実施形態１～１１等は、本開示の目的を達成できれば、設計等に応じて種々の変更が可能である。 (Other Modifications)
The above-described first to eleventh embodiments are merely examples of various embodiments of the present disclosure. The above-described first to eleventh embodiments can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved.

　例えば、受電端末２の整流回路２１１は、４つのダイオードがブリッジ接続された全波整流回路でもよいし、半波整流回路でもよい。 For example, the rectifier circuit 211 of the power receiving terminal 2 may be a full-wave rectifier circuit in which four diodes are bridge-connected, or a half-wave rectifier circuit.

　（態様）
　本明細書には、以下の態様が開示されている。 (Aspects)
The present specification discloses the following aspects.

　第１の態様に係る無線給電システム（３；３Ａ；３Ｂ；３Ｃ；３Ｄ；３Ｅ；３Ｆ；３Ｇ；３Ｈ）は、送電器（１；１Ａ；１Ｂ；１Ｃ；１Ｆ；１Ｇ）と、受電端末（２；２Ａ；２Ｂ；２Ｃ；２Ｄ；２Ｅ）と、を備える。受電端末（２；２Ａ；２Ｂ；２Ｃ；２Ｄ；２Ｅ）は、送電器（１；１Ａ；１Ｂ；１Ｃ；１Ｆ；１Ｇ）から給電される。送電器（１；１Ａ；１Ｂ；１Ｃ；１Ｆ；１Ｇ）は、複数の送電コイル（１０）と、複数の送電回路（１１）と、コントローラ（１２）と、を有する。複数の送電回路（１１）は、複数の送電コイル（１０）と一対一に対応し、複数の送電コイル（１０）のうち対応する送電コイル（１０）に送電電力を供給する。コントローラ（１２）は、複数の送電回路（１１）を制御する。複数の送電回路（１１）の各々は、複数の送電コイル（１０）のうち対応する送電コイル（１０）へ交流電力を出力する。受電端末（２）は、複数の受電コイル（２０）と、複数の受電回路（２１）と、直流出力部（２４）と、を有する。複数の受電コイル（２０）は、複数の送電コイル（１０）のうち対向する送電コイル（１０）から交流電力を受電する。複数の受電回路（２１）は、複数の受電コイル（２０）と一対一に対応し、複数の受電コイル（２０）のうち対応する受電コイル（２０）により受電した交流電力を直流電力に変換する。直流出力部（２４）は、第１直流出力端子（２４１）及び第２直流出力端子（２４２）を含む。第１直流出力端子（２４１）は、複数の受電回路（２１）それぞれの高電位側の出力端が共通接続される。第２直流出力端子（２４２）は、複数の受電回路（２１）それぞれの低電位側の出力端が共通接続される。コントローラ（１２）は、複数の受電回路（２１）それぞれの出力電圧の情報を複数の受電回路（２１）それぞれからの無線信号（Ｗ２）により取得し、複数の受電回路（２１）の互いの出力電圧が同じになるように、複数の送電回路（１１）の各々の送電電波の周波数と電力との少なくとも一方を制御する。 A wireless power supply system (3; 3A; 3B; 3C; 3D; 3E; 3F; 3G; 3H) according to a first aspect includes a power transmitter (1; 1A; 1B; 1C; 1F; 1G) and a power receiving terminal (2; 2A; 2B; 2C; 2D; 2E). The power receiving terminal (2; 2A; 2B; 2C; 2D; 2E) is supplied with power from the power transmitter (1; 1A; 1B; 1C; 1F; 1G). The power transmitter (1; 1A; 1B; 1C; 1F; 1G) includes a plurality of power transmitting coils (10), a plurality of power transmitting circuits (11), and a controller (12). The plurality of power transmitting circuits (11) correspond one-to-one to the plurality of power transmitting coils (10), and supply transmission power to a corresponding one of the plurality of power transmitting coils (10). The controller (12) controls the multiple power transmission circuits (11). Each of the multiple power transmission circuits (11) outputs AC power to a corresponding one of the multiple power transmission coils (10). The power receiving terminal (2) has multiple power receiving coils (20), multiple power receiving circuits (21), and a DC output unit (24). The multiple power receiving coils (20) receive AC power from an opposing one of the multiple power transmission coils (10). The multiple power receiving circuits (21) correspond one-to-one to the multiple power receiving coils (20) and convert AC power received by a corresponding one of the multiple power receiving coils (20) into DC power. The DC output unit (24) includes a first DC output terminal (241) and a second DC output terminal (242). The first DC output terminal (241) is commonly connected to the high-potential output terminals of the multiple power receiving circuits (21). The second DC output terminal (242) is commonly connected to the low-potential output terminals of the multiple power receiving circuits (21). The controller (12) acquires information on the output voltage of each of the multiple power receiving circuits (21) via wireless signals (W2) from each of the multiple power receiving circuits (21), and controls at least one of the frequency and power of the transmission radio waves of each of the multiple power transmitting circuits (11) so that the output voltages of the multiple power receiving circuits (21) are the same.

　この態様によれば、受電端末（２；２Ａ；２Ｂ；２Ｃ；２Ｄ；２Ｅ）での受電電力の大電力化及び電力効率の向上を図ることが可能となる。 This aspect makes it possible to increase the power received by the power receiving terminals (2; 2A; 2B; 2C; 2D; 2E) and improve power efficiency.

　第２の態様に係る無線給電システム（３）では、第１の態様において、受電端末（２）は、複数の受電回路（２１）の各々から無線信号（Ｗ２）をコントローラ（１２）へ送信する。 In the wireless power supply system (3) according to the second aspect, in the first aspect, the power receiving terminal (2) transmits a wireless signal (W2) from each of the multiple power receiving circuits (21) to the controller (12).

　この態様によれば、複数の送電回路（１１）の各々において無線信号（Ｗ２）を受信する必要がないので、送電器（１）の小型化及び軽量化を図ることが可能となる。 In this embodiment, there is no need for each of the multiple power transmission circuits (11) to receive a wireless signal (W2), making it possible to reduce the size and weight of the power transmitter (1).

　第３の態様に係る無線給電システム（３Ａ）では、第１の態様において、複数の送電回路（１１）の各々は、第１通信回路（１６）を更に含む。複数の受電回路（２１）の各々は、第２通信回路（２６）を更に含む。受電端末（２Ａ）は、複数の受電回路（２１）それぞれの第２通信回路（２６）から、複数の送電回路（１１）それぞれの第１通信回路（１６）へ無線信号（Ｗ２）を送信する。コントローラ（１２）は、複数の送電回路（１１）それぞれの第１通信回路（１６）から、複数の受電回路（２１）それぞれの出力電圧の情報を取得する。 In the wireless power supply system (3A) according to the third aspect, in the first aspect, each of the multiple power transmission circuits (11) further includes a first communication circuit (16). Each of the multiple power reception circuits (21) further includes a second communication circuit (26). The power receiving terminal (2A) transmits a wireless signal (W2) from the second communication circuit (26) of each of the multiple power reception circuits (21) to the first communication circuit (16) of each of the multiple power transmission circuits (11). The controller (12) acquires information on the output voltage of each of the multiple power reception circuits (21) from the first communication circuit (16) of each of the multiple power transmission circuits (11).

　この態様によれば、受電端末（２Ａ）の複数の受電回路（２１）毎に複数の送電回路（１１）のうち対応する送電回路（１１）と通信可能となる。 According to this aspect, each of the multiple power receiving circuits (21) of the power receiving terminal (2A) can communicate with a corresponding power transmitting circuit (11) among the multiple power transmitting circuits (11).

　第４の態様に係る無線給電システム（３Ａ）では、第１の態様において、複数の送電回路（１１）の各々は、第１電圧測定回路（１３）と、第１電流測定回路（１４）と、第１通信回路（１６）と、を更に含む。第１電圧測定回路（１３）は、送電回路（１１）の入力電圧を測定する。第１電流測定回路（１４）は、送電回路（１１）の入力電流を測定する。複数の受電回路（２１）の各々は、第２電圧測定回路（２２）と、第２電流測定回路（２３）と、第２通信回路（２６）と、を更に含む。第２電圧測定回路（２２）は、受電回路（２１）の出力電圧を測定する。第２電流測定回路（２３）は、受電回路（２１）の出力電流を測定する。複数の受電回路（２１）の各々は、第２通信回路（２６）から複数の送電回路（１１）のうち対応する送電回路（１１）の第１通信回路（１６）へ、第２電圧測定回路（２２）の測定電圧値のデータと第２電流測定回路（２３）の測定電流値のデータとを含む無線信号（Ｗ２）を送信する。コントローラ（１２）は、第１電圧測定回路（１３）から取得した測定電圧値のデータと第１電流測定回路（１４）から取得した測定電流値のデータとを用いて送電電力を計算する。コントローラ（１２）は、第２通信回路（２６）から第１通信回路（１６）へ送信された測定電圧値のデータ及び測定電流値のデータを用いて受電電力を計算する。コントローラ（１２）は、送電電力と受電電力とを用いて電力効率を計算する。コントローラ（１２）は、電力効率が最大となるように送電電波の周波数を制御する。 In the wireless power supply system (3A) of the fourth aspect, in the first aspect, each of the multiple power transmission circuits (11) further includes a first voltage measurement circuit (13), a first current measurement circuit (14), and a first communication circuit (16). The first voltage measurement circuit (13) measures the input voltage of the power transmission circuit (11). The first current measurement circuit (14) measures the input current of the power transmission circuit (11). Each of the multiple power receiving circuits (21) further includes a second voltage measurement circuit (22), a second current measurement circuit (23), and a second communication circuit (26). The second voltage measurement circuit (22) measures the output voltage of the power receiving circuit (21). The second current measurement circuit (23) measures the output current of the power receiving circuit (21). Each of the multiple power receiving circuits (21) transmits a wireless signal (W2) including measured voltage value data from the second voltage measurement circuit (22) and measured current value data from the second current measurement circuit (23) to the first communication circuit (16) of a corresponding one of the multiple power transmitting circuits (11) from the second communication circuit (26). The controller (12) calculates the transmitted power using the measured voltage value data acquired from the first voltage measurement circuit (13) and the measured current value data acquired from the first current measurement circuit (14). The controller (12) calculates the received power using the measured voltage value data and measured current value data transmitted from the second communication circuit (26) to the first communication circuit (16). The controller (12) calculates the power efficiency using the transmitted power and received power. The controller (12) controls the frequency of the transmitted radio waves to maximize power efficiency.

　この態様によれば、電力効率を最大化できるので、送電電力を低減でき、消費電力を低下させることができる。 This aspect maximizes power efficiency, reducing transmission power and lowering power consumption.

　第５の態様に係る無線給電システム（３Ｂ）では、第１の態様において、複数の受電回路（２１）の各々は、複数の受電コイル（２０）のうち対応する受電コイル（２０）を介して無線信号（Ｗ２）を送信するための変調回路（２７）を含む。複数の送電回路（１１）の各々は、複数の送電コイル（１０）のうち対応する送電コイル（１０）を介して無線信号（Ｗ２）を受信するための復調回路（１７）を含む。 In the wireless power supply system (3B) according to the fifth aspect, in the first aspect, each of the multiple power receiving circuits (21) includes a modulation circuit (27) for transmitting a wireless signal (W2) via a corresponding one of the multiple power receiving coils (20). Each of the multiple power transmitting circuits (11) includes a demodulation circuit (17) for receiving the wireless signal (W2) via a corresponding one of the multiple power transmitting coils (10).

　この態様によれば、複数の送電コイル（１０）及び複数の受電コイル（２０）の各々を通信用のアンテナとして兼用することが可能となる。 According to this embodiment, each of the multiple power transmitting coils (10) and multiple power receiving coils (20) can also be used as a communication antenna.

　第６の態様に係る無線給電システム（３Ｂ）では、第５の態様において、複数の送電回路（１１）の各々は、第１電圧測定回路（１３）と、第１電流測定回路（１４）と、を更に含む。第１電圧測定回路（１３）は、送電回路（１１）の入力電圧を測定する。第１電流測定回路（１４）は、送電回路（１１）の入力電流を測定する。複数の受電回路（２１）の各々は、第２電圧測定回路（２２）と、第２電流測定回路（２３）と、を更に含む。第２電圧測定回路（２２）は、受電回路（２１）の出力電圧を測定する。第２電流測定回路（２３）は、受電回路（２１）の出力電流を測定する。複数の受電回路（２１）の各々は、変調回路（２７）から複数の送電回路（１１）のうち対応する送電回路（１１）の復調回路（１７）へ無線信号（Ｗ２）を送信する。無線信号（Ｗ２）は、第２電圧測定回路（２２）の測定電圧値のデータと第２電流測定回路（２３）の測定電流値のデータとを含む。コントローラ（１２）は、第１電圧測定回路（１３）から取得した測定電圧値のデータと第１電流測定回路（１４）から取得した測定電流値のデータとを用いて入力電力を計算する。コントローラ（１２）は、変調回路（２７）から復調回路（１７）へ送信された測定電圧値のデータ及び測定電流値のデータを用いて出力電力を計算する。コントローラ（１２）は、入力電力と出力電力とを用いて電力効率を計算し、電力効率が最大となるように送電電波の周波数を制御する。 In the wireless power supply system (3B) of the sixth aspect, in the fifth aspect, each of the multiple power transmission circuits (11) further includes a first voltage measurement circuit (13) and a first current measurement circuit (14). The first voltage measurement circuit (13) measures the input voltage of the power transmission circuit (11). The first current measurement circuit (14) measures the input current of the power transmission circuit (11). Each of the multiple power receiving circuits (21) further includes a second voltage measurement circuit (22) and a second current measurement circuit (23). The second voltage measurement circuit (22) measures the output voltage of the power receiving circuit (21). The second current measurement circuit (23) measures the output current of the power receiving circuit (21). Each of the multiple power receiving circuits (21) transmits a wireless signal (W2) from the modulation circuit (27) to the demodulation circuit (17) of a corresponding one of the multiple power transmission circuits (11). The wireless signal (W2) includes measured voltage value data from the second voltage measurement circuit (22) and measured current value data from the second current measurement circuit (23). The controller (12) calculates input power using the measured voltage value data acquired from the first voltage measurement circuit (13) and the measured current value data acquired from the first current measurement circuit (14). The controller (12) calculates output power using the measured voltage value data and measured current value data transmitted from the modulation circuit (27) to the demodulation circuit (17). The controller (12) calculates power efficiency using the input power and output power, and controls the frequency of the transmission radio waves to maximize power efficiency.

　この態様によれば、電力効率を最大化できるので、送電電力を低減でき、消費電力を低下させることができる。 This aspect maximizes power efficiency, reducing transmission power and lowering power consumption.

　第７の態様に係る受電端末（２；２Ａ；２Ｂ；２Ｃ；２Ｄ；２Ｅ）は、複数の送電コイル（１０）を有する送電器（１；１Ａ；１Ｂ；１Ｃ；１Ｆ；１Ｇ）により給電される。受電端末（２；２Ａ；２Ｂ；２Ｃ；２Ｄ；２Ｅ）は、複数の受電コイル（２０）と、複数の受電回路（２１）と、直流出力部（２４）と、を備える。複数の受電回路（２１）は、複数の受電コイル（２０）と一対一に対応し、複数の受電コイル（２０）のうち対応する受電コイル（２０）により受電した交流電力を直流電力に変換する。直流出力部（２４）は、第１直流出力端子（２４１）及び第２直流出力端子（２４２）を含む。第１直流出力端子（２４１）は、複数の受電回路（２１）それぞれの高電位側の出力端が共通接続される。第２直流出力端子（２４２）は、複数の受電回路（２１）それぞれの低電位側の出力端が共通接続される受電端末（２；２Ａ；２Ｂ；２Ｃ；２Ｄ；２Ｅ）は、複数の受電回路（２１）それぞれの出力電圧の情報を複数の受電回路（２１）それぞれからの無線信号（Ｗ２）により送電器（１；１Ａ；１Ｂ；１Ｃ；１Ｆ；１Ｇ）へ送信する。 The power receiving terminal (2; 2A; 2B; 2C; 2D; 2E) according to the seventh aspect is supplied with power by a power transmitter (1; 1A; 1B; 1C; 1F; 1G) having a plurality of power transmitting coils (10). The power receiving terminal (2; 2A; 2B; 2C; 2D; 2E) includes a plurality of power receiving coils (20), a plurality of power receiving circuits (21), and a DC output unit (24). The plurality of power receiving circuits (21) correspond one-to-one to the plurality of power receiving coils (20), and convert AC power received by a corresponding power receiving coil (20) among the plurality of power receiving coils (20) into DC power. The DC output unit (24) includes a first DC output terminal (241) and a second DC output terminal (242). The first DC output terminal (241) is commonly connected to the high-potential output terminals of the plurality of power receiving circuits (21). The second DC output terminal (242) is a power receiving terminal (2; 2A; 2B; 2C; 2D; 2E) to which the low-potential output terminals of the multiple power receiving circuits (21) are commonly connected, and transmits information about the output voltage of each of the multiple power receiving circuits (21) to the power transmitter (1; 1A; 1B; 1C; 1F; 1G) via a wireless signal (W2) from each of the multiple power receiving circuits (21).

　この態様によれば、受電端末（２；２Ａ；２Ｂ；２Ｃ；２Ｄ；２Ｅ）での受電電力の大電力化及び電力効率の向上を図ることが可能となる。 This aspect makes it possible to increase the power received by the power receiving terminals (2; 2A; 2B; 2C; 2D; 2E) and improve power efficiency.

　第８の態様に係る送電器（１；１Ａ；１Ｂ；１Ｃ；１Ｆ；１Ｇ）は、受電端末（２；２Ａ；２Ｂ；２Ｃ；２Ｄ；２Ｅ）へ無線で送電する。送電器（１；１Ａ；１Ｂ；１Ｃ；１Ｆ；１Ｇ）は、複数の送電コイル（１０）と、複数の送電回路（１１）と、コントローラ（１２）と、を備える。複数の送電回路（１１）は、複数の送電コイル（１０）と一対一に対応し、複数の送電コイル（１０）のうち対応する送電コイル（１０）に送電電力を供給する。コントローラ（１２）は、複数の送電回路（１１）を制御する。複数の送電回路（１１）の各々は、複数の送電コイル（１０）のうち対応する送電コイル（１０）へ交流電力を出力する。受電端末（２；２Ａ；２Ｂ；２Ｃ；２Ｄ；２Ｅ）は、複数の受電コイル（２０）と、複数の受電回路（２１）と、直流出力部（２４）と、を備える。複数の受電コイル（２０）は、複数の送電コイル（１０）のうち対向する送電コイル（１０）から交流電力を受電する。複数の受電回路（２１）は、複数の受電コイル（２０）と一対一に対応し、複数の受電コイル（２０）のうち対応する受電コイル（２０）により受電した交流電力を直流電力に変換する。直流出力部（２４）は、第１直流出力端子（２４１）及び第２直流出力端子（２４２）を含む。第１直流出力端子（２４１）は、複数の受電回路（２１）それぞれの高電位側の出力端が共通接続される。第２直流出力端子（２４２）は、複数の受電回路（２１）それぞれの低電位側の出力端が共通接続される。コントローラ（１２）は、複数の受電回路（２１）それぞれの出力電圧の情報を複数の受電回路（２１）それぞれからの無線信号（Ｗ２）により取得し、複数の受電回路（２１）の互いの出力電圧が同じになるように、複数の送電回路（１１）の各々の送電電波の周波数と電力との少なくとも一方を制御する。 A power transmitter (1; 1A; 1B; 1C; 1F; 1G) according to an eighth aspect wirelessly transmits power to a power receiving terminal (2; 2A; 2B; 2C; 2D; 2E). The power transmitter (1; 1A; 1B; 1C; 1F; 1G) includes a plurality of power transmission coils (10), a plurality of power transmission circuits (11), and a controller (12). The plurality of power transmission circuits (11) correspond one-to-one to the plurality of power transmission coils (10), and supply transmission power to a corresponding one of the plurality of power transmission coils (10). The controller (12) controls the plurality of power transmission circuits (11). Each of the plurality of power transmission circuits (11) outputs AC power to a corresponding one of the plurality of power transmission coils (10). The power receiving terminal (2; 2A; 2B; 2C; 2D; 2E) includes a plurality of power receiving coils (20), a plurality of power receiving circuits (21), and a DC output unit (24). The plurality of power receiving coils (20) receive AC power from opposing power transmitting coils (10) among the plurality of power transmitting coils (10). The plurality of power receiving circuits (21) correspond one-to-one to the plurality of power receiving coils (20) and convert AC power received by a corresponding power receiving coil (20) among the plurality of power receiving coils (20) into DC power. The DC output unit (24) includes a first DC output terminal (241) and a second DC output terminal (242). The first DC output terminal (241) is commonly connected to the high-potential side output terminals of the plurality of power receiving circuits (21). The second DC output terminal (242) is commonly connected to the low-potential output terminals of the multiple power receiving circuits (21). The controller (12) acquires information on the output voltage of each of the multiple power receiving circuits (21) via a wireless signal (W2) from each of the multiple power receiving circuits (21), and controls at least one of the frequency and power of the transmission radio waves of each of the multiple power transmitting circuits (11) so that the output voltages of the multiple power receiving circuits (21) are the same.

　この態様によれば、受電端末（２；２Ａ；２Ｂ；２Ｃ；２Ｄ；２Ｅ）での受電電力の大電力化及び電力効率の向上を図ることが可能となる。 This aspect makes it possible to increase the power received by the power receiving terminals (2; 2A; 2B; 2C; 2D; 2E) and improve power efficiency.

　１、１Ａ、１Ｂ、１Ｃ、１Ｆ、１Ｇ　送電器
　１０　送電コイル
　１１　送電回路
　１１０　ＤＣ－ＡＣ変換回路
　１２　コントローラ
　１３　電圧測定回路（第１電圧測定回路）
　１４　電流測定回路（第１電流測定回路）
　１６　第１通信回路
　１７　復調回路
　２、２Ａ、２Ｂ、２Ｃ、２Ｄ、２Ｅ　受電端末
　２０　受電コイル
　２１　受電回路
　２１１　整流回路
　２２　電圧測定回路（第２電圧測定回路）
　２３　電流測定回路（第２電流測定回路）
　２４　直流出力部
　２４１　第１直流出力端子
　２４２　第２直流出力端子
　２５　ダイオード回路
　２６　第２通信回路
　２７　変調回路
　２８　電圧調整回路
　３、３Ａ、３Ｂ、３Ｃ、３Ｄ、３Ｅ、３Ｆ、３Ｇ、３Ｈ　無線給電システム
　Ｗ２　無線信号 1, 1A, 1B, 1C, 1F, 1G Power transmitter 10 Power transmission coil 11 Power transmission circuit 110 DC-AC conversion circuit 12 Controller 13 Voltage measurement circuit (first voltage measurement circuit)
14 Current measurement circuit (first current measurement circuit)
16 First communication circuit 17 Demodulation circuit 2, 2A, 2B, 2C, 2D, 2E Power receiving terminal 20 Power receiving coil 21 Power receiving circuit 211 Rectification circuit 22 Voltage measurement circuit (second voltage measurement circuit)
23 Current measurement circuit (second current measurement circuit)
24 DC output unit 241 First DC output terminal 242 Second DC output terminal 25 Diode circuit 26 Second communication circuit 27 Modulation circuit 28 Voltage adjustment circuit 3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H Wireless power supply system W2 Wireless signal

Claims (8)

　送電器と、
　前記送電器から給電される受電端末と、を備え、
　前記送電器は、
　　複数の送電コイルと、
　　前記複数の送電コイルと一対一に対応し、前記複数の送電コイルのうち対応する送電コイルに送電電力を供給する複数の送電回路と、
　　前記複数の送電回路を制御するコントローラと、を有し、
　前記複数の送電回路の各々は、
　　前記複数の送電コイルのうち対応する送電コイルへ交流電力を出力し、
　前記受電端末は、
　　前記複数の送電コイルのうち対向する送電コイルから交流電力を受電する複数の受電コイルと、
　　前記複数の受電コイルと一対一に対応し、前記複数の受電コイルのうち対応する受電コイルにより受電した交流電力を直流電力に変換する複数の受電回路と、
　　前記複数の受電回路それぞれの高電位側の出力端が共通接続される第１直流出力端子及び前記複数の受電回路それぞれの低電位側の出力端が共通接続される第２直流出力端子を含む直流出力部と、を有し、
　前記コントローラは、前記複数の受電回路それぞれの出力電圧の情報を前記複数の受電回路それぞれからの無線信号により取得し、前記複数の受電回路の互いの出力電圧が同じになるように、前記複数の送電回路の各々の送電電波の周波数と電力との少なくとも一方を制御する、
　無線給電システム。 A power transmitter;
a power receiving terminal to which power is supplied from the power transmitter,
The power transmitter comprises:
A plurality of transmitting coils;
a plurality of power transmission circuits each corresponding to the plurality of power transmission coils and supplying transmission power to a corresponding one of the plurality of power transmission coils;
a controller that controls the plurality of power transmission circuits,
Each of the plurality of power transmission circuits
outputting AC power to a corresponding one of the plurality of power transmitting coils;
The power receiving terminal
a plurality of power receiving coils that receive AC power from opposing power transmitting coils among the plurality of power transmitting coils;
a plurality of power receiving circuits each corresponding to the plurality of power receiving coils, and each converting AC power received by a corresponding one of the plurality of power receiving coils into DC power;
a DC output unit including a first DC output terminal to which high potential side output terminals of the plurality of power receiving circuits are commonly connected and a second DC output terminal to which low potential side output terminals of the plurality of power receiving circuits are commonly connected,
The controller acquires information on the output voltage of each of the plurality of power receiving circuits by wireless signals from each of the plurality of power receiving circuits, and controls at least one of the frequency and power of the transmission radio waves of each of the plurality of power transmitting circuits so that the output voltages of the plurality of power receiving circuits are the same.
Wireless power supply system. 　前記受電端末は、
　　前記複数の受電回路の各々から前記無線信号を前記コントローラへ送信する、
　請求項１に記載の無線給電システム。 The power receiving terminal
transmitting the wireless signal from each of the plurality of power receiving circuits to the controller;
The wireless power supply system according to claim 1 . 　前記複数の送電回路の各々は、第１通信回路を更に含み、
　前記複数の受電回路の各々は、第２通信回路を更に含み、
　前記受電端末は、
　　前記複数の受電回路それぞれの前記第２通信回路から、前記複数の送電回路それぞれの第１通信回路へ前記無線信号を送信し、
　前記コントローラは、前記複数の送電回路それぞれの前記第１通信回路から、前記複数の受電回路それぞれの前記出力電圧の情報を取得する、
　請求項１に記載の無線給電システム。 each of the plurality of power transmission circuits further includes a first communication circuit;
each of the plurality of power receiving circuits further includes a second communication circuit;
The power receiving terminal
transmitting the wireless signal from the second communication circuit of each of the plurality of power receiving circuits to the first communication circuit of each of the plurality of power transmitting circuits;
the controller acquires information about the output voltage of each of the plurality of power receiving circuits from the first communication circuit of each of the plurality of power transmitting circuits.
The wireless power supply system according to claim 1 . 　前記複数の送電回路の各々は、
　　前記送電回路の入力電圧を測定する第１電圧測定回路と、
　　前記送電回路の入力電流を測定する第１電流測定回路と、
　　第１通信回路と、を更に含み、
　前記複数の受電回路の各々は、
　　前記受電回路の出力電圧を測定する第２電圧測定回路と、
　　前記受電回路の出力電流を測定する第２電流測定回路と、
　　第２通信回路と、を更に含み、
　前記複数の受電回路の各々は、前記第２通信回路から前記複数の送電回路のうち対応する送電回路の前記第１通信回路へ、前記第２電圧測定回路の測定電圧値のデータと前記第２電流測定回路の測定電流値のデータとを含む無線信号を送信し、
　前記コントローラは、
　　前記第１電圧測定回路から取得した測定電圧値のデータと前記第１電流測定回路から取得した測定電流値のデータとを用いて入力電力を計算し、
　　前記第２通信回路から前記第１通信回路へ送信された前記測定電圧値のデータ及び前記測定電流値のデータを用いて出力電力を計算し、
　　前記入力電力と前記出力電力とを用いて電力効率を計算し、
　　前記電力効率が最大となるように前記送電電波の周波数を制御する、
　請求項１に記載の無線給電システム。 Each of the plurality of power transmission circuits
a first voltage measurement circuit for measuring an input voltage of the power transmission circuit;
a first current measuring circuit for measuring an input current of the power transmitting circuit;
a first communication circuit;
Each of the plurality of power receiving circuits
a second voltage measurement circuit for measuring an output voltage of the power receiving circuit;
a second current measuring circuit for measuring an output current of the power receiving circuit;
a second communication circuit;
each of the plurality of power receiving circuits transmits a wireless signal, including data on the measured voltage value of the second voltage measurement circuit and data on the measured current value of the second current measurement circuit, from the second communication circuit to the first communication circuit of a corresponding power transmitting circuit among the plurality of power transmitting circuits;
The controller
calculating an input power using the measured voltage value data acquired from the first voltage measurement circuit and the measured current value data acquired from the first current measurement circuit;
calculating an output power using the measured voltage value data and the measured current value data transmitted from the second communication circuit to the first communication circuit;
calculating a power efficiency using the input power and the output power;
controlling the frequency of the power transmission radio wave so as to maximize the power efficiency;
The wireless power supply system according to claim 1 . 　前記複数の受電回路の各々は、前記複数の受電コイルのうち前記対応する受電コイルを介して前記無線信号を送信するための変調回路を含み、
　前記複数の送電回路の各々は、前記複数の送電コイルのうち前記対応する送電コイルを介して前記無線信号を受信するための復調回路を含む、
　請求項１に記載の無線給電システム。 each of the plurality of power receiving circuits includes a modulation circuit for transmitting the wireless signal via the corresponding one of the plurality of power receiving coils;
each of the plurality of power transmitting circuits includes a demodulation circuit for receiving the wireless signal via the corresponding one of the plurality of power transmitting coils;
The wireless power supply system according to claim 1 . 　前記複数の送電回路の各々は、
　　前記送電回路の入力電圧を測定する第１電圧測定回路と、
　　前記送電回路の入力電流を測定する第１電流測定回路と、を更に含み、
　前記複数の受電回路の各々は、
　　前記受電回路の出力電圧を測定する第２電圧測定回路と、
　　前記受電回路の出力電流を測定する第２電流測定回路と、を更に含み、
　前記複数の受電回路の各々は、前記変調回路から前記複数の送電回路のうち対応する送電回路の前記復調回路へ前記無線信号を送信し、
　前記無線信号は、前記第２電圧測定回路の測定電圧値のデータと前記第２電流測定回路の測定電流値のデータとを含み、
　前記コントローラは、
　　前記第１電圧測定回路から取得した測定電圧値のデータと前記第１電流測定回路から取得した測定電流値のデータとを用いて入力電力を計算し、
　　前記変調回路から前記復調回路へ送信された前記測定電圧値のデータ及び前記測定電流値のデータを用いて出力電力を計算し、
　　前記入力電力と前記出力電力とを用いて電力効率を計算し、
　　前記電力効率が最大となるように前記送電電波の周波数を制御する、
　請求項５に記載の無線給電システム。 Each of the plurality of power transmission circuits
a first voltage measurement circuit for measuring an input voltage of the power transmission circuit;
a first current measurement circuit that measures an input current of the power transmission circuit;
Each of the plurality of power receiving circuits
a second voltage measurement circuit for measuring an output voltage of the power receiving circuit;
a second current measuring circuit that measures an output current of the power receiving circuit;
each of the plurality of power receiving circuits transmits the wireless signal from the modulation circuit to the demodulation circuit of a corresponding one of the plurality of power transmitting circuits;
the wireless signal includes data of a measured voltage value of the second voltage measurement circuit and data of a measured current value of the second current measurement circuit,
The controller
calculating an input power using the measured voltage value data obtained from the first voltage measurement circuit and the measured current value data obtained from the first current measurement circuit;
calculating an output power using the measured voltage value data and the measured current value data transmitted from the modulation circuit to the demodulation circuit;
calculating a power efficiency using the input power and the output power;
controlling the frequency of the power transmission radio wave so as to maximize the power efficiency;
The wireless power supply system according to claim 5 . 　複数の送電コイルを有する送電器により給電される受電端末であって、
　複数の受電コイルと、
　前記複数の受電コイルと一対一に対応し、前記複数の受電コイルのうち対応する受電コイルにより受電した交流電力を直流電力に変換する複数の受電回路と、
　前記複数の受電回路それぞれの高電位側の出力端が共通接続される第１直流出力端子及び前記複数の受電回路それぞれの低電位側の出力端が共通接続される第２直流出力端子を含む直流出力部と、を備え、
　前記複数の受電回路それぞれの出力電圧の情報を前記複数の受電回路それぞれからの無線信号により送電器へ送信する、
　受電端末。 A power receiving terminal that is supplied with power by a power transmitter having a plurality of power transmitting coils,
A plurality of receiving coils;
a plurality of power receiving circuits each corresponding to the plurality of power receiving coils, and each converting AC power received by a corresponding one of the plurality of power receiving coils into DC power;
a DC output unit including a first DC output terminal to which high potential side output terminals of the plurality of power receiving circuits are commonly connected and a second DC output terminal to which low potential side output terminals of the plurality of power receiving circuits are commonly connected,
transmitting information about the output voltage of each of the plurality of power receiving circuits to a power transmitter by a wireless signal from each of the plurality of power receiving circuits;
Power receiving terminal. 　受電端末へ無線で送電する送電器であって、
　複数の送電コイルと、
　前記複数の送電コイルと一対一に対応し、前記複数の送電コイルのうち対応する送電コイルに送電電力を供給する複数の送電回路と、
　前記複数の送電回路を制御するコントローラと、を備え、
　前記複数の送電回路の各々は、
　　前記複数の送電コイルのうち対応する送電コイルへ交流電力を出力し、
　前記受電端末は、
　　前記複数の送電コイルのうち対向する送電コイルから交流電力を受電する複数の受電コイルと、
　　前記複数の受電コイルと一対一に対応し、前記複数の受電コイルのうち対応する受電コイルにより受電した交流電力を直流電力に変換する複数の受電回路と、
　　前記複数の受電回路それぞれの高電位側の出力端が共通接続される第１直流出力端子及び前記複数の受電回路それぞれの低電位側の出力端が共通接続される第２直流出力端子を含む直流出力部と、を備え、
　前記コントローラは、前記複数の受電回路それぞれの出力電圧の情報を前記複数の受電回路それぞれからの無線信号により取得し、前記複数の受電回路の互いの出力電圧が同じになるように、前記複数の送電回路の各々の送電電波の周波数と電力との少なくとも一方を制御する、
　送電器。 A power transmitter that wirelessly transmits power to a power receiving terminal,
A plurality of transmitting coils;
a plurality of power transmission circuits each corresponding to the plurality of power transmission coils and supplying transmission power to a corresponding one of the plurality of power transmission coils;
a controller that controls the plurality of power transmission circuits,
Each of the plurality of power transmission circuits
outputting AC power to a corresponding one of the plurality of power transmitting coils;
The power receiving terminal
a plurality of power receiving coils that receive AC power from opposing power transmitting coils among the plurality of power transmitting coils;
a plurality of power receiving circuits each corresponding to the plurality of power receiving coils, and each converting AC power received by a corresponding one of the plurality of power receiving coils into DC power;
a DC output unit including a first DC output terminal to which high potential side output terminals of the plurality of power receiving circuits are commonly connected and a second DC output terminal to which low potential side output terminals of the plurality of power receiving circuits are commonly connected,
The controller acquires information on the output voltage of each of the plurality of power receiving circuits by wireless signals from each of the plurality of power receiving circuits, and controls at least one of the frequency and power of the transmission radio waves of each of the plurality of power transmitting circuits so that the output voltages of the plurality of power receiving circuits are the same.
Power transmitter.
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JP2018107846A (en) * 2016-12-22 2018-07-05 東芝テック株式会社 Non-contact power supply device and program
CN116231887A (en) * 2023-03-22 2023-06-06 重庆理工大学 Wireless power transmission system and performance optimization method based on multi-coil single-tube inverter
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