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WO2025249003A1 - Système d'alimentation électrique sans fil, borne de réception de puissance et émetteur de puissance - Google Patents

Système d'alimentation électrique sans fil, borne de réception de puissance et émetteur de puissance

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
English (en)
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/fr
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.

Landscapes

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

Abstract

La présente invention augmente la puissance de transmission et améliore le rendement électrique. Chaque circuit d'une pluralité de circuits de transmission de puissance (11) délivre une puissance CA à une bobine de transmission de puissance correspondante (10) parmi une pluralité de bobines de transmission de puissance (10). Une borne de réception de puissance (2) comprend : une pluralité de bobines de réception de puissance (20) ; une pluralité de circuits de réception de puissance (21) ; et une unité de sortie CC (24). Chaque circuit de la pluralité de circuits de réception de puissance (21) convertit, en puissance CC, la puissance CA reçue par une bobine de réception de puissance correspondante (20) parmi la pluralité de bobines de réception de puissance (20). L'unité de sortie CC (24) comprend une première borne de sortie CC (241) et une seconde borne de sortie CC (242). Un dispositif de commande (12) acquiert des informations sur la tension de sortie de chaque circuit de la pluralité de circuits de réception de puissance (21) au moyen d'un signal sans fil (W2) provenant du circuit de réception de puissance (21), et commande la fréquence et/ou la puissance d'une onde de transmission de puissance de chaque circuit de la pluralité de circuits de transmission de puissance (11) de telle sorte que les tensions de sortie de la pluralité de circuits de réception de puissance (21) soient identiques.
PCT/JP2025/014774 2024-05-31 2025-04-15 Système d'alimentation électrique sans fil, borne de réception de puissance et émetteur de puissance Pending WO2025249003A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2024-089541 2024-05-31
JP2024089541 2024-05-31

Publications (1)

Publication Number Publication Date
WO2025249003A1 true WO2025249003A1 (fr) 2025-12-04

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Country Status (1)

Country Link
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010541531A (ja) * 2007-09-28 2010-12-24 アクセス ビジネス グループ インターナショナル リミテッド ライアビリティ カンパニー 多相誘導電力供給システム
WO2017179203A1 (fr) * 2016-04-15 2017-10-19 三菱電機エンジニアリング株式会社 Dispositif source d'alimentation à résonance et système de transmission d'énergie par résonance
JP2018107846A (ja) * 2016-12-22 2018-07-05 東芝テック株式会社 非接触給電装置及びプログラム
CN116231887A (zh) * 2023-03-22 2023-06-06 重庆理工大学 基于多线圈单管逆变的无线电能传输系统及性能优化方法
WO2024225251A1 (fr) * 2023-04-27 2024-10-31 株式会社デンソー Dispositif d'alimentation électrique sans contact

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010541531A (ja) * 2007-09-28 2010-12-24 アクセス ビジネス グループ インターナショナル リミテッド ライアビリティ カンパニー 多相誘導電力供給システム
WO2017179203A1 (fr) * 2016-04-15 2017-10-19 三菱電機エンジニアリング株式会社 Dispositif source d'alimentation à résonance et système de transmission d'énergie par résonance
JP2018107846A (ja) * 2016-12-22 2018-07-05 東芝テック株式会社 非接触給電装置及びプログラム
CN116231887A (zh) * 2023-03-22 2023-06-06 重庆理工大学 基于多线圈单管逆变的无线电能传输系统及性能优化方法
WO2024225251A1 (fr) * 2023-04-27 2024-10-31 株式会社デンソー Dispositif d'alimentation électrique sans contact

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