WO2015104768A1

WO2015104768A1 - Contactless power supply device control method and contactless power supply device

Info

Publication number: WO2015104768A1
Application number: PCT/JP2014/006408
Authority: WO
Inventors: 真理子木藤; 悟田舎片; 田村　秀樹; 一志中澤; 裕岩堀
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2014-01-07
Filing date: 2014-12-23
Publication date: 2015-07-16
Also published as: JPWO2015104768A1; JP6183671B2

Abstract

In the present invention, a contactless power supply device comprises: a power supplying device (1) that includes a power supply-side resonant circuit (12), and a primary coil (L1) which is connected to the power supply-side resonant circuit (12); and a power receiving device (2) that includes a power reception-side resonant circuit (21), a secondary coil (L2) which is connected to the power reception-side resonant circuit (21) and which can receive power from the primary coil (L1) using magnetic energy, and a rectifier circuit (22) which rectifies power received at the secondary coil (L2) to generate output power and supplies the same to a load. A contactless power supply device control method uses at least one of the following techniques: a technique in which the primary coil (L1) is electrified using the high frequency current of each of a plurality of test-use drive frequencies, and while the primary coil is being electrified the resonant frequency of resonance characteristics in a state where the primary coil (L1) and the secondary coil (L2) are coupled is specified; or a technique in which on the basis of the output power supplied to the load, the resonant frequency of resonance characteristics while the output power is being supplied in a state where the primary coil (L1) and the secondary coil (L2) are coupled is specified.

Description

Control method of noncontact power feeding device and noncontact power feeding device

The present invention relates to a control method of a noncontact power feeding device and a noncontact power feeding device.

Conventionally, various non-contact power feeding devices have been proposed which transmit power in a non-contacting state from the primary coil of the power feeding device to the secondary coil of the power receiving device (for example, Patent Document 1). With the spread of electric vehicles, this type of non-contact power feeding device has attracted more and more attention in recent years for application to an electric vehicle non-contact power feeding system.

By the way, when the noncontact power feeding device is applied to the electric vehicle noncontact power feeding system, the power feeding device is provided at the feeding station, and the power receiving device is mounted on the electric vehicle. Incidentally, the primary coil of the power feeding device is installed on the ground of, for example, a designated place of the power feeding station, and the secondary coil of the power receiving device is installed on the lower surface of the vehicle body, for example. As a result, when the electric vehicle stops at the designated position of the feeding station, the primary coil and the secondary coil face each other, and in charging the electric vehicle, non-contact power is supplied from the primary coil to the secondary coil. Then, the power transmitted to the secondary coil is rectified and charged to a secondary battery such as a lithium battery of the electric vehicle.

Unexamined-Japanese-Patent No. 2003-204637

By the way, when it applies to an electric vehicle non-contact electric supply system, the dispersion | variation in the gap between the primary coil of a feeding station and the secondary coil of an electric vehicle is large. In addition, it is difficult for the electric vehicle to stop at the designated place of the feeding station accurately, and since it stops at a position shifted from the designated place, the relative position of the primary coil L1 and the secondary coil L2 for each electric vehicle to be charged. May be different.

As the relative position of the primary coil L1 and the secondary coil L2 changes, the leakage flux also changes and the coupling coefficient fluctuates. Due to the fluctuation of the coupling coefficient, the resonance characteristic (resonance frequency) of the power feeding device also fluctuates each time. As a result, efficient contactless power feeding of power has been difficult.

Further, when generating a high frequency current of the drive frequency for feeding supplied to the primary coil in the high frequency inverter due to the fluctuation of the resonance characteristic (resonance frequency) of such a power feeding device, the drive frequency is an advance of the resonance characteristic (resonance frequency) There is a possibility of being located in the range of the phase mode. When the drive frequency is in the range of the phase advance mode of the resonance characteristic (resonance frequency) and the high frequency inverter generates a high frequency current, the switching element of the high frequency inverter becomes hard switching. As a result, there is a problem that the loss is increased and the switching element is damaged.

The present invention has been made to solve the above problems, and an object thereof is to provide a control method and a contactless power supply device capable of efficiently transmitting power even if the coupling coefficient changes. It is to provide.

According to one aspect of the present invention, there is provided a power supply apparatus including a power supply resonance circuit and a primary coil connected to the power supply resonance circuit, a power reception resonance circuit, and a power reception resonance circuit, which is connected to magnetic energy. And a power receiving device including: a secondary coil capable of receiving power from the primary coil; and a rectifying circuit that rectifies power received by the secondary coil to generate output power and supplies the power to a load. A control method of a non-contact power feeding device, comprising: energizing the primary coil with high frequency currents of a plurality of test drive frequencies and resonating characteristics of the primary coil and the secondary coil in a coupled state at that time. At least at least a method of specifying a resonance frequency or a method of specifying a resonance frequency of a resonance characteristic in a coupled state of the primary coil and the secondary coil at that time based on the output power supplied to the load One of the techniques used.

In the above configuration, when the primary coil is energized with each high frequency current of a plurality of test drive frequencies, the primary coil and the secondary coil at that time are based on the primary current flowing through the primary coil. It is preferable to specify the resonance frequency of the resonance characteristic in the coupled state of

In the above configuration, the primary coil and the secondary coil at that time are based on the output power supplied to the load when the primary coil is energized by each high frequency current of a plurality of test drive frequencies. It is preferable to specify the resonance frequency of the resonance characteristic in the coupled state of

In the above configuration, when the primary coil is energized with high frequency current of each of a plurality of test drive frequencies, the primary current flowing through the primary coil or the primary coil is supplied to the load by energizing it. Identifying the resonance frequency of the resonance characteristic in the coupled state of the primary coil and the secondary coil at that time based on the output power to be supplied, and the feed side resonance based on the resonance frequency of the resonance characteristic specified. It is preferable to control the resonance parameter of at least one of the circuit and the power receiving side resonance circuit to bias the resonance frequency of the resonance characteristic.

In the above configuration, the resonance frequency of the resonance characteristic in the coupled state of the primary coil and the secondary coil at that time is specified by energizing the primary coil with high frequency current of each of a plurality of test drive frequencies. The power supply resonance circuit or the power receiving side such that the feeding drive frequency is located in the range of the slow phase mode of a frequency range higher than the resonance frequency of the resonance characteristic based on the resonance frequency of the specified resonance characteristic After controlling at least one resonance parameter of the resonance circuit to bias the resonance frequency of the resonance characteristic, and biasing the resonance frequency of the resonance characteristic, the primary coil is energized by the high frequency current of the driving frequency for feeding. It is preferable to start the power supply.

One aspect of the present invention is a noncontact power feeding apparatus, which includes a power feeding resonance circuit and a primary coil connected to the power feeding resonance circuit, a power receiving resonance circuit, and a power receiving resonance. A secondary coil connected to the circuit and capable of receiving power from the primary coil using magnetic energy, and a rectifier circuit that rectifies the power received by the secondary coil to generate output power and supply it to a load And a high frequency inverter for generating a high frequency current to be supplied to the primary coil, and a plurality of generated high frequency currents for a plurality of test drive frequencies with respect to the high frequency inverter. A test drive control circuit for energizing the primary coil with each high frequency current of the test drive frequency, and the primary coil when energizing the primary coil with each high frequency current of the plurality of test drive frequencies; A resonance frequency specifying circuit for specifying a resonance frequency of a resonance characteristic in a coupled state with the secondary coil, and a driving frequency for feeding is located in a range of a slow mode of a frequency range higher than the resonance frequency of the specified resonance characteristic As described above, a parameter control circuit is provided which controls the resonance parameter of at least one of the power supply resonance circuit or the power reception resonance circuit to bias the resonance frequency of the resonance characteristic.

In the above configuration, the power feeding device includes a primary current detection circuit that detects a primary current flowing through the primary coil when the primary coil is energized with each high frequency current of a plurality of test drive frequencies, The resonance frequency identification circuit is provided in the power feeding apparatus, and based on a primary current detected by a primary current detection circuit, resonance of resonance characteristics in a coupled state of the primary coil and the secondary coil at that time. It is preferable to specify the frequency.

In the above-mentioned configuration, the resonant frequency identification circuit determines the primary coil at that time based on output power supplied to the load by energizing the primary coil with high frequency current of each of a plurality of test drive frequencies. It is preferable to specify the resonance frequency of the resonance characteristic in the coupled state of the second coil and the second coil.

In the above configuration, the power receiving device detects an output power to be output to the load, and generates an output power information, and an output power information supplied from the output power detecting circuit is supplied to the power feeding device. It is preferable that the power supply device includes a power receiving communication circuit that receives the output power information from the power receiving communication circuit and that outputs the power information to the resonant frequency identification circuit.

In the above configuration, it is preferable that the power supply resonance circuit includes a variable capacitor connected in series to the primary coil, and the resonance parameter includes a capacitance of the variable capacitor.

In the above configuration, the power supply resonance circuit preferably includes a variable coil connected in series to the primary coil, and the resonance parameter preferably includes an inductance of the variable coil.

In the above configuration, it is preferable that the power reception side resonance circuit includes a variable capacitor connected in series to the secondary coil, and the resonance parameter includes a capacitor capacity of the variable capacitor.

In the above configuration, the power receiving side resonance circuit preferably includes a variable coil connected in series to the secondary coil, and the resonance parameter preferably includes an inductance of the variable coil.

In the above configuration, the power receiving device includes a power receiving side communication circuit, and a power receiving side control circuit that stores power receiving device information of itself and transmits the power receiving device information to the power feeding device via the power receiving side communication circuit. The power supply apparatus includes a power supply communication circuit that receives the power reception apparatus information transmitted from the power reception communication circuit, and the test drive control circuit based on the power reception apparatus information received by the power supply communication circuit. It is preferable that the circuit includes a control circuit that controls at least one processing operation of the resonance frequency identification circuit and at least one of the parameter control circuits.

According to the present invention, efficient power transmission can be performed even if the coupling coefficient changes.

The electric block diagram of the electric power feeding apparatus of the non-contact electric power feeding apparatus for demonstrating 1st Embodiment, and a power receiving apparatus. The electric circuit diagram of the high frequency inverter of the electric power feeder for describing 1st Embodiment. The electric circuit diagram of the electric power feeding side resonance circuit for demonstrating 1st Embodiment. (A) for explaining the first embodiment is a resonance characteristic diagram showing an output with respect to frequency for explaining a phase advance mode and a phase delay mode, (b) is a drive frequency for feeding in the range of the phase advance mode The figure which shows a state, (c) is a figure which shows the state which is in the range of a slow phase mode, and the drive frequency for electric power feeding is an optimal position. The electric block diagram of the electric power feeding apparatus of the non-contact electric power feeding apparatus for demonstrating 2nd Embodiment, and a power receiving apparatus. The electric block diagram of the electric power feeding apparatus of the non-contact electric power feeding apparatus for demonstrating 3rd Embodiment, and a power receiving apparatus. The electric circuit diagram of the power receiving side resonance circuit for describing 3rd Embodiment. The electric block diagram of the electric power feeding apparatus for demonstrating another example of a non-contact electric power feeding apparatus, and a power receiving apparatus. The electric circuit diagram for demonstrating the other example of the electric power feeding side resonance circuit. The electric circuit diagram for demonstrating the other example of the electric power feeding side resonance circuit. The electric circuit diagram for demonstrating the other example of the electric power feeding side resonance circuit. The electric circuit diagram for demonstrating the other example of the electric power feeding side resonance circuit. The electric circuit diagram for demonstrating the other example of a power receiving side resonance circuit.

First Embodiment
A contactless power supply device according to a first embodiment of the present invention will now be described with reference to the drawings.
FIG. 1 shows an electrical block circuit diagram for explaining the electrical configuration of the noncontact power feeding device. The non-contact power feeding device includes a power feeding device 1 including a primary coil L1, and a power receiving device 2 including a secondary coil L2 that receives non-contact power feeding from the power feeding device 1.

(Feeding device 1)
As shown in FIG. 1, the power supply apparatus 1 including the primary coil L1 includes a power supply circuit 10, a high frequency inverter 11, a power supply resonance circuit 12, a drive circuit 13, a power supply control unit 15, a power supply communication circuit 17, and power supply. A side antenna AT1 is provided.

(Power supply circuit 10)
The power supply circuit 10 has a rectifier circuit and a DC / DC converter. AC power is supplied to the power supply circuit 10 from an external commercial AC power supply G. The rectifier circuit rectifies the supplied AC power. Then, the DC / DC converter converts the DC voltage supplied from the rectifier circuit into a desired voltage, and outputs the DC voltage Vdd to the high frequency inverter 11 as a drive voltage. The power supply circuit 10 is also configured to generate and supply operating voltages to the drive circuit 13, the power supply side control unit 15, and the power supply side communication circuit 17.

(High frequency inverter 11)
As shown in FIG. 2, the high frequency inverter 11 is a known full bridge circuit, and includes four MOS transistors Qa, Qb, Qc and Qd. The four MOS transistors Qa, Qb, Qc and Qd are connected to each other across the primary side circuit of the feeding device 1 formed by a series circuit of the primary coil L1 and the feeding side resonance circuit 12 , Qd and the pair of MOS transistors Qb, Qc. Then, by alternately turning on and off the two sets, a high-frequency current of a predetermined power supply drive frequency fz for energizing the primary coil L1 is generated.

Further, the high frequency inverter 11 is configured to generate high frequency currents of a plurality of test drive frequencies ft for energizing the primary coil L1.
Then, power is transmitted to the secondary coil L2 of the power receiving device 2 by exciting and driving the primary coil L1 with the high frequency currents for the power supply and test drive frequencies fz and ft. Then, the power is converted into a DC output power P in the power receiving device 2.

Although the high frequency inverter 11 is formed of a MOS transistor, it may be formed of an IGBT or another bipolar transistor or the like.
(Feed side resonance circuit 12)
As shown in FIG. 3, in the feed side resonance circuit 12, bidirectional switches Q1 to Q5 are respectively connected in series to five capacitors C1 to C5 having different capacities, and the five series circuits are connected in parallel. It is done. Although five series circuits of a capacitor and a switch are connected in parallel, the present invention is not limited to this, and a plurality of other series circuits may be connected in parallel.

The switches Q1 to Q5 are on / off controlled based on selection control signals SLS1 to SLS5 from the power supply side control unit 15. When one of the switches Q1 to Q5 is turned on, a capacitor connected in series to the turned on switch is connected in series to the primary coil L1. That is, the resonance characteristic F1 (resonance frequency fr) of the primary side circuit of the feed unit 1 can be adjusted.

More specifically, with respect to the resonance characteristic F1 shown in FIG. 4A, the resonance characteristic F1 in the arrow direction can be obtained by changing the capacitance (resonance parameter) of the power supply side resonance circuit 12 connected in series with the primary coil L1. (Resonance frequency fr) can be biased.

(Drive circuit 13)
The drive circuit 13 receives a drive control signal CTS from the power supply side control unit 15, and generates drive signals PSa, PSb, PSc, PSd for output to the gate terminals of the MOS transistors Qa to Qd. That is, based on the drive control signal CTS from the power supply side control unit 15, the drive circuit 13 generates drive signals PSa to PSd for alternately turning on and off each set.

At this time, the drive circuit 13 generates drive signals PSa to PSd based on the drive control signal CTS from the power supply side control unit 15, and excites the primary coil L1 with a high frequency current of the power supply drive frequency fz determined in advance. To drive.

The drive circuit 13 also generates drive signals PSa to PSd for exciting and driving the primary coil L1 with high frequency currents of a plurality of test drive frequencies ft based on the drive control signal CTS from the power supply side control unit 15. Do.

(Feed side control unit 15)
The power supply side control unit 15 has a microcomputer, and outputs a drive control signal CTS for exciting and driving the primary coil L1 with a high frequency current of a predetermined power supply drive frequency fz to the drive circuit 13.

In addition, the power supply side control unit 15 outputs, to the drive circuit 13, a plurality of drive control signals CTS for exciting and driving the primary coil L1 with high frequency currents of a plurality of test drive frequencies ft. The feed-side control unit 15 causes high frequency currents of a plurality of test drive frequencies ft to be applied to the primary coil L1, and the resonance characteristics F1 (resonance frequency fr) in the coupled state of the primary coil L1 and the secondary coil L2 at that time. Is configured to index).

Further, when the high frequency current of the plurality of test drive frequencies ft is supplied to the primary coil L1, the power supply side control unit 15 supplies the output power information of the output power P output from the power reception device 2 with the power supply communication circuit 17. It is configured to get through.

The power supply side control unit 15 receives the output power information of the output power P when the primary coil L1 is excited and driven by the high frequency current of each test drive frequency ft, and the output power P with respect to each test drive frequency ft Ask for

Then, from the plurality of output powers P respectively corresponding to the plurality of test drive frequencies ft, the power supply side control unit 15 has resonance characteristics F1 (resonance frequency fr) in the coupled state of the primary coil L1 and the secondary coil L2 at that time. Is configured to index).

According to the indexing method, when the primary coil L1 is excited and driven at a high frequency current at each test drive frequency ft, the output power P output from the power reception device 2 increases as the test drive frequency ft approaches the resonance frequency fr. On the contrary, the output power P becomes smaller as the test drive frequency ft gets farther from the resonance frequency fr.

Therefore, when the test drive frequency ft is raised and lowered in ascending or descending order of the frequency, when the output power P falls from the rise, there is an output power P that peaks between them, and the test drive before the peak It can be seen that there is a resonant frequency fr in the coupled state between the frequency ft and the test drive frequency ft after the peak. Therefore, in the first embodiment, the power supply side control unit 15 takes the average value of the test drive frequency ft before the peak and the test drive frequency ft after the peak as the resonance frequency fr of the resonance characteristic F1 in the coupled state at that time. It is configured to index. For example, the power supply side control unit 15 sequentially energizes the primary coil L1 with a plurality of high frequency currents respectively having a plurality of test drive frequencies, and flows the primary coil L1 when electrifying the primary coil L1. The resonance characteristics in the coupled state between the primary coil L1 and the secondary coil L2 at that time are detected based on the detection result of the primary current and the output voltage detected by detecting the current or the output voltage supplied to the load. Identify the resonant frequency of

Then, the feed-side control unit 15 determines the resonance frequency fr. Next, whether the power supply drive frequency fz of the high frequency current supplied to the primary coil L1 for power supply is in the range of the phase delay mode which is a frequency range higher than the resonance frequency fr at that time. Please calculate.

That is, as shown in FIG. 4B, when the power supply drive frequency fz is in the range of the phase advance mode which is a frequency range lower than the resonance frequency fr at that time, the MOS transistors Qa to Qd of the high frequency inverter 11 are hard It becomes switching. Then, the loss is increased, which causes the semiconductor switching element to be damaged. From this, it is desirable to avoid that the power supply drive frequency fz is in the range of the phase advance mode.

If the feed drive frequency fz determined in advance is not within the range of the slow phase mode, which is a frequency range higher than the resonance frequency fr of the resonance characteristic F1 at that time, the feed side control unit 15 determines the resonance frequency fr of the resonance characteristic F1 at that time. Bias. The bias of the resonance characteristic F1 (resonance frequency fr) is made possible by changing the capacitor capacity (resonance parameter) of the power supply side resonance circuit 12.

Further, as shown in FIG. 4C, the power supply side control unit 15 sets a target position in the range of the lagging mode from the resonance frequency fr at that time and the predetermined power supply drive frequency fz. The capacitor capacity of the power feeding side resonance circuit 12 required to be located in The power supply side control unit 15 outputs the selection control signals SLS1 to SLS5 to the power supply side resonant circuit 12 based on the calculated capacitor capacity, and adjusts the capacitor capacity of the power supply side resonant circuit 12 to the calculated capacitor capacity.

As a result, as shown in FIG. 4C, the resonance characteristic F1 (resonance frequency fr) is biased, and the power supply drive frequency fz is positioned at the target position in the range of the lagging mode.
(Power supply side communication circuit 17)
The power feeding device 1 includes a power feeding side communication circuit 17. The power supply communication circuit 17 is configured to receive the output power information of the output power P transmitted from the power receiving device 2 through the power supply antenna AT1. The power supply side communication circuit 17 outputs the received output power information of the output power P from the power receiving device 2 to the power supply side control unit 15.

(Receiver 2)
Next, the power receiving device 2 provided with the secondary coil L2 will be described. The power receiving device 2 receives the power transmitted by the magnetic energy generated by the primary coil L1 of the power feeding device 1 by the secondary coil L2, performs DC conversion, and supplies it to the secondary battery 20 as a load. The battery 20 is charged.

As shown in FIG. 1, the power receiving device 2 includes a secondary battery 20, a power receiving side resonance circuit 21, a rectifying circuit 22, a smoothing circuit 23, an output power detection circuit 24, a power receiving side control unit 25, a power receiving side communication circuit 26, and power receiving. A side antenna AT2 is provided.

(Receiver-side resonant circuit 21)
As shown in FIG. 1, the power receiving device 2 has a power receiving side resonance circuit 21 connected in series to the secondary coil L2. The power reception side resonance circuit 21 is formed of a resonance capacitor Cx in the first embodiment, and is connected in series to the secondary coil L2 to constitute a secondary side circuit of the power reception device 2.

(Rectifier circuit 22)
The power receiving device 2 has a rectifying circuit 22 and is connected to a secondary side circuit formed of a series circuit of a secondary coil L2 and a resonant capacitor Cx. The rectification circuit 22 full-wave rectifies the induced electromotive force induced in the secondary coil L2 that receives the transmitted power using the magnetic energy of the primary coil L1 of the power feeding device 1, and the capacitor provided in the next stage It outputs to the smoothing circuit 23 and is converted into DC power. The direct current power is then supplied to the secondary battery 20.

(Secondary battery 20)
The secondary battery 20 is a secondary battery such as a lithium battery.
(Output power detection circuit 24)
The output power detection circuit 24 is provided between the smoothing circuit 23 and the secondary battery 20, and detects the occasional output power P supplied to the secondary battery 20. The output power detection circuit 24 outputs a detection signal of the detected output power P to the power reception control unit 25.

(Receiver control unit 25)
The power reception side control unit 25 has a microcomputer, and outputs a detection signal of the output power P from the output power detection circuit 24 to the power reception side communication circuit 26 as output power information.

(Receiver side communication circuit 26)
The power receiving communication circuit 26 is configured to transmit output power information to the power feeding communication circuit 17 of the power feeding device 1 via the power receiving antenna AT2.

Next, the operation of the non-contact power feeding apparatus configured as described above will be described.
In addition, when demonstrating an effect | action, the electric vehicle non-contact electric power feeding system which provides the electric power feeding apparatus 1 in a electric power feeding station, and mounts the power receiving apparatus 2 in an electric vehicle is actualized, and a non-contact electric power supply is demonstrated.

Therefore, it is assumed that the primary coil L1 of the feeding device 1 provided at the feeding station is installed, for example, on the ground of a designated place to which the electric vehicle is fed. On the other hand, the secondary coil L2 of the power receiving device 2 mounted on the electric vehicle is provided, for example, on the lower surface of the vehicle body, and is positioned above the primary coil L1 when the electric vehicle is stopped at the designated place of the feeding station. It shall oppose the following coil L1.

Now, before the electric vehicle is stopped at a designated place of the feed station and power feeding (actual feeding) is started by the feeding device 1 provided at the feeding station, the power feeding device 1 executes the test mode.

First, the power supply side control unit 15 outputs a drive control signal CTS to the drive circuit 13 so as to excite and drive the primary coil L1 with a high frequency current at the test drive frequency ft. Drive circuit 13 outputs drive signals PSa to PSd to high frequency inverter 11 in response to drive control signal CTS. The high frequency inverter 11 generates a high frequency current of the test drive frequency ft in response to the drive signals PSa to PSd, and causes the primary coil L1 to be energized by the generated high frequency current. The primary coil L1 generates an alternating magnetic field of the test drive frequency ft when energized with a high frequency current of the test drive frequency ft.

As a result, the secondary coil L2 located above the primary coil L1 induces power of the test drive frequency ft with the magnetic energy of the primary coil. The rectifier circuit 22 of the power receiving device 2 rectifies the power induced in the secondary coil L2, and the smoothing circuit 23 smoothes the DC voltage supplied from the rectifier circuit 22. The smoothed DC voltage is supplied to the secondary battery 20.

At this time, the output power detection circuit 24 of the power reception device 2 detects the output power P based on the excitation drive of the primary coil L1 with the high frequency current of the test drive frequency ft. The power receiving side control unit 25 transmits output power information of the output power P with respect to the test drive frequency ft to the power feeding device 1 via the power receiving side communication circuit 26.

Upon acquiring the output power information from the power receiving device 2, the power feeding side control unit 15 of the power feeding device 1 stores the output power information in a storage circuit provided therein, and the frequency is different from the test drive frequency ft. The primary coil L1 is excited and driven by a high frequency current having a proper test drive frequency ft. Then, the output power detection circuit 24 of the power reception device 2 detects the output power P based on the excitation drive of the primary coil L1 with the high frequency current of the new test drive frequency ft.

The power receiving side control unit 25 transmits output power information of the new output power P with respect to the new test drive frequency ft to the power feeding device 1 through the power receiving side communication circuit 26.
The power supply side control unit 15 of the power supply device 1 acquires new output power information from the power reception device 2. Then, the power supply side control unit 15 stores the new output power information in the memory circuit provided inside, and the high frequency current of the new test drive frequency ft having a frequency different from that of the test drive frequency up to now 1 The next coil L1 is excited and driven.

Thereafter, the power supply side control unit 15 and the power reception side control unit 25 similarly repeat the acquisition operation of the output power information to obtain the output power P for the plurality of test drive frequencies ft. After obtaining the plurality of output powers P respectively corresponding to the plurality of test drive frequencies ft, the power supply side control unit 15 determines the resonance characteristic F1 (resonance frequency in the coupled state of the primary coil L1 and the secondary coil L2 at that time). Find the fr)

Subsequently, when the power supply side control unit 15 determines the resonance frequency fr, a predetermined power supply drive frequency fz of high frequency current supplied to the primary coil L1 for power supply is higher than the resonance frequency fr at that time. Calculate whether it is in the range of the lagging mode.

Then, the power supply side control unit 15 is required to position a predetermined power supply drive frequency fz at a target position in the range of the lagging phase mode from the resonance frequency fr at that time and the predetermined power supply drive frequency fz. The capacitance of the power supply resonance circuit 12 is calculated.

The power supply side control unit 15 outputs the selection control signals SLS1 to SLS5 to the power supply side resonant circuit 12 based on the calculated capacitor capacity, and adjusts the capacitor capacity of the power supply side resonant circuit 12 to the calculated capacitor capacity.

As described above, when the capacitor capacity (resonance parameter) of the feed side resonance circuit 12 is adjusted, the test mode ends, and the feed device 1 uses the high frequency current of the feed drive frequency fz determined in advance to set the primary coil L1. Excitation drive is performed to start actual feeding.

Therefore, the actual feeding is performed from the state where the feeding drive frequency fz is in the range of the lagging mode which is a frequency range higher than the resonance frequency fr at that time. Therefore, hard switching of MOS transistors Qa to Qd is avoided, and an increase in loss can be prevented beforehand and damage to elements can be prevented beforehand.

In particular, in the case of the electric vehicle contactless power supply stem, it is difficult for the electric vehicle to accurately stop at the designated location of the feeding station, and it may always stop at a position deviated from the designated location. That is, there is a possibility that the relative position of the primary coil L1 and the secondary coil L2 may differ every time charging is performed. Therefore, depending on the relative position of the primary coil L1 and the secondary coil L2, the leakage flux is different and the coupling coefficient is also varied. Due to the fluctuation of the coupling coefficient, the resonance characteristic F1 (resonance frequency fr) of the power feeding device 1 also fluctuates.

However, even if the resonance characteristic F1 fluctuates every time the electric vehicle is charged, the power supply side control unit 15 does not perform the resonance characteristic F1 in the coupled state of the primary coil L1 and the secondary coil L2 at that time in the test mode in advance. (Resonance frequency fr) is determined. Then, the capacitor capacity (resonance parameter) of the power supply resonance circuit 12 is controlled so that the predetermined power supply drive frequency fz of the high frequency inverter 11 falls within the range of the lagging mode, and the resonance characteristic F1 (resonance frequency fr) Adjusted.

Therefore, when embodied in a contactless power supply system for an electric vehicle, hard switching of MOS transistors Qa to Qd based on operation in the phase advance mode is avoided to prevent an increase in loss and prevent damage. .

Next, the effects of the first embodiment configured as described above will be described below.
(1) The power feeding apparatus 1 performs a test mode before actual power feeding, and determines the resonance characteristic F1 (resonance frequency fr) in the coupled state of the primary coil L1 and the secondary coil L2 at that time. Then, the capacitor capacity (resonance parameter) of the power supply resonance circuit 12 is controlled so that the predetermined power supply drive frequency fz of the high frequency inverter 11 falls within the range of the lagging mode, and the resonance characteristic F1 (resonance frequency fr) Adjusted.

Therefore, even when the use conditions are different, during actual feeding, hard switching of MOS transistors Qa to Qd based on the operation in the phase advance mode is avoided, thereby preventing an increase in loss and preventing damage. It can be carried out.

In particular, as in the case of an electric vehicle contactless power supply system, efficient power transmission can be performed when the resonance characteristic of the power supply apparatus 1 fluctuates whenever the use condition changes from time to time.
Second Embodiment
Next, the non-contact power feeding system of the second embodiment will be described.

As shown in FIG. 5, in the second embodiment, the power supply side communication circuit 17, the power receiving side communication circuit 26 and the output power detection circuit 24 described in the first embodiment are omitted. Then, the primary current i flowing through the primary coil L1 is detected, and the resonance characteristic F1 (resonance frequency fr) in the coupled state of the primary coil L1 and the secondary coil L2 at that time is determined, and a predetermined feed drive is provided. The frequency fz was set to be in the range of the lagging mode. Therefore, for the convenience of description, the features will be described in detail.

(Primary current detection circuit 14)
As shown in FIG. 5, the power supply device 1 includes a primary current detection circuit 14. The primary current detection circuit 14 is provided between the high frequency inverter 11 and the power supply resonance circuit 12. The primary current detection circuit 14 detects an occasional primary current i flowing to the primary coil L1. The primary current detection circuit 14 outputs the value of the detected primary current i to the power supply control unit 15.

(Feed side control unit 15)
As in the first embodiment, the power supply control unit 15 outputs a drive control signal CTS for generating high-frequency current for power supply and test drive frequencies fz and ft to the drive circuit 13.

Further, the power supply side control unit 15 causes the high frequency current of the plurality of test drive frequencies ft to be applied to the primary coil L1, respectively, and the resonance characteristic F1 in the coupled state of the primary coil L1 and the secondary coil L2 at that time The resonance frequency fr) is determined.

In the second embodiment, the power supply side control unit 15 obtains the values of the plurality of primary currents i when the primary coil L1 is excited and driven by the high frequency currents of the plurality of test drive frequencies ft. Then, based on the value of the primary current i with respect to each test drive frequency ft, the power supply side control unit 15 sets the resonance characteristic F1 (resonance frequency fr) in the coupled state of the primary coil L1 and the secondary coil L2 at that time. It is configured to index.

The indexing method is the same as in the first embodiment. That is, when the high-frequency current excites and drives the primary coil L1 at each test drive frequency ft, the value of the primary current i increases as the test drive frequency ft approaches the resonance frequency. On the contrary, the value of the primary current i becomes smaller as the test drive frequency ft moves away from the resonance frequency.

Therefore, when the test drive frequency ft is raised and lowered in ascending or descending order of frequency, when the value of the primary current i falls from a rise, there is a peak between them, and the test drive frequency ft before that peak It can be seen that there is a resonant frequency fr in the coupled state between the and the test drive frequency ft after the peak. Therefore, in the second embodiment, the power supply side control unit 15 uses the average value of the test drive frequency ft before the peak and the test drive frequency ft after the peak as the resonance frequency fr of the resonance characteristic F1 in the coupled state at that time. It is configured to index.

Then, the feed-side control unit 15 determines the resonance characteristic F1 (resonance frequency fr). Next, as in the first embodiment, the feed control unit 15 is required to locate the target position in the slow phase mode, which is a frequency range higher than the resonance frequency fr at that time, for the feed drive frequency fz. The capacitance of the power supply resonance circuit 12 is calculated.

The feed-side control unit 15 outputs selection control signals SLS1 to SLS5 based on the calculated capacitor capacitance to the feed-side resonant circuit 12 to adjust the capacitor capacitance (resonance parameter) of the feed-side resonant circuit 12 to the calculated capacitor capacitance. .

Next, the operation of the non-contact power feeding system configured as described above will be described.
In addition, when demonstrating an effect | action, the non-contact electric power feeding apparatus is concretely demonstrated in the electric vehicle non-contact electric power feeding system which provides the electric power feeding apparatus 1 in a feed station, and mounts the power receiving apparatus 2 in an electric vehicle.

As in the first embodiment, the power supply control unit 15 causes the primary coil L1 to pass high-frequency current at a plurality of test drive frequencies ft. The primary current detection circuit 14 detects the value of the primary current i when the high frequency current of each test drive frequency ft is supplied to the primary coil L1. The power supply side control unit 15 acquires values of a plurality of primary currents i respectively corresponding to the plurality of test drive frequencies ft. Based on the values of the plurality of primary currents i respectively corresponding to the plurality of test drive frequencies ft, the power supply side control unit 15 has resonance characteristics F1 (a state in which the primary coil L1 and the secondary coil L2 are coupled at that time). Determine the resonant frequency fr).

Subsequently, when the power supply side control unit 15 determines the resonance characteristic F1 (resonance frequency fr), the power supply drive frequency fz is located at the target position in the range of the slow phase mode, as in the first embodiment. The necessary capacitance value of the power supply side resonance circuit 12 is calculated.

Then, the power supply side control unit 15 outputs the selection control signals SLS1 to SLS5 to the power supply side resonant circuit 12 based on the calculated capacitor capacity to adjust the capacitor capacity of the power supply side resonant circuit 12 to the calculated capacitor capacity. As described above, when the capacitor capacity (resonance parameter) of the feed side resonance circuit 12 is adjusted, the test mode ends, and the feed device 1 uses the high frequency current of the feed drive frequency fz determined in advance to set the primary coil L1. Excitation drive is performed to start actual feeding.

Therefore, the actual feeding is performed from the state where the feeding drive frequency fz is in the range of the lagging mode which is a frequency range higher than the resonance frequency fr of the resonance characteristic F1 at that time. As a result, hard switching of the MOS transistors Qa to Qd is avoided, and an increase in loss can be prevented beforehand and damage to the element can be prevented beforehand.

Moreover, since the test mode is performed on the power supply device 1 side, the power supply side communication circuit 17 for transmitting and receiving data between the power supply device 1 and the power receiving device 2 shown in the first embodiment, the power receiving side communication The circuit 26 and the like become unnecessary.

The second embodiment has the following effects in addition to the first embodiment.
(1) Since it is not necessary to exchange data between the power feeding device 1 and the power receiving device 2, the test mode can be performed without providing communication devices in the power feeding device 1 and the power receiving device 2.

Third Embodiment
Next, the non-contact electric power feeding system of 3rd Embodiment is demonstrated.
As shown in FIG. 6, in the third embodiment, the power reception side resonance circuit 21 has a variable capacitor capacity (resonance parameter), and the power reception side control unit 25 provided in the power reception device 2 is the power reception side resonance circuit 21. Are configured to adjust the capacitance of the Thereby, the capacitor capacity (resonance parameter) of the power feeding side resonance circuit 12 is fixed.

As shown in FIG. 7, in the power receiving side resonance circuit 21 of the third embodiment, bidirectional switches Qx1 to Qx5 are connected in series to five capacitors Cx1 to Cx5 having different capacities, respectively. The series circuit was connected in parallel. Although five series circuits of capacitors and switches are connected in parallel, the number of series circuits is not limited, and a plurality of other series circuits may be connected in parallel.

Each of the switches Qx1 to Qx5 is on / off controlled based on selection control signals SLSx1 to SLSx5 from the power receiving side control unit 25. When one of the switches Qx1 to Qx5 is turned on, a capacitor connected in series to the turned on switch is connected in series to the secondary coil L2.

That is, the capacitor capacity (resonance parameter) of the power reception side resonance circuit 21 connected in series with the secondary coil L2 is changed. As a result, the resonance characteristic (resonance frequency) of the secondary side circuit of the power reception device 2 can be adjusted, and the resonance characteristic F1 (resonance frequency fr) of the primary circuit of the power supply device 1 can be biased.

Further, the power receiving device 2 is provided with the power receiving side control unit 25. And, the power receiving side control unit 25 outputs the selection control signals SLSx1 to SLSx5 to the power feeding side resonant circuit 12 and the capacitor capacity of the power receiving side resonant circuit 21. Is configured to adjust.

Furthermore, the power feeding device 1 is provided with the power feeding communication circuit 17, and the power receiving device 2 is provided with the power receiving communication circuit 26. As a result, it is possible to exchange data between the power feeding device 1 (power feeding side control unit 15) and the power receiving device 2 (power receiving side control unit 25).

Then, the power supply side control unit 15 determines the resonance frequency fr as in the second embodiment. Next, the power reception side resonance circuit required for the power supply side control unit 15 to locate the predetermined power supply drive frequency fz at a target position in the range of the lagging mode which is a frequency range higher than the resonance frequency fr at that time. Calculate the capacitance value (resonance parameter) of 21.

The power supply side control unit 15 transmits the information of the calculated capacitance of the power reception side resonant circuit 21 to the power reception device 2 via the power supply side communication circuit 17. When receiving information on the capacitance of the capacitor via the power receiving communication circuit 26, the power receiving control unit 25 outputs selection control signals SLSx1 to SLSx5 based on the information to the power feeding resonant circuit 12 and outputs the selected power resonant circuit 21. Adjust the capacitor value to the calculated capacitor value.

Then, when the capacitor capacity (resonance parameter) of the power receiving side resonance circuit 21 is adjusted, the test mode is ended, and the power feeding device 1 excites and drives the primary coil L1 with a high frequency current of a predetermined power feeding drive frequency fz. Then, actual power feeding is started.

Next, the operation of the non-contact power feeding system configured as described above will be described.
In addition, when demonstrating an effect | action, the electric vehicle non-contact electric power feeding system which provides the electric power feeding apparatus 1 in a electric power feeding station, and mounts the power receiving apparatus 2 in an electric vehicle is actualized, and a non-contact electric power supply is demonstrated.

As in the second embodiment, high frequency currents of a plurality of test drive frequencies ft are supplied to the primary coil L1. Then, the power supply side control unit 15 acquires the values of the plurality of primary currents i respectively detected by the primary current detection circuit 14 with respect to the plurality of test drive frequencies ft. Based on the values of the plurality of primary currents i respectively corresponding to the plurality of test drive frequencies ft, the power supply side control unit 15 has resonance characteristics F1 (a state in which the primary coil L1 and the secondary coil L2 are coupled at that time). Determine the resonant frequency fr).

Subsequently, when the power supply side control unit 15 determines the resonance characteristic F1 (resonance frequency fr), similarly to the second embodiment, the predetermined power supply drive frequency fz is located at the target position in the slow phase mode range. The capacity of the capacitor of the power receiving side resonance circuit 21 required to do this is calculated. Then, the power supply side control unit 15 transmits the information of the calculated capacitor capacity to the power reception device 2 through the power supply side communication circuit 17.

The power reception side control unit 25 calculates selection control signals SLSx1 to SLSx5 based on the information of the capacitor capacity, and outputs the result to the power supply side resonance circuit 12. As a result, the capacitor capacity of the power receiving side resonance circuit 21 is adjusted to the calculated capacitor capacity, and the test mode ends.

According to the third embodiment, in the test mode, the capacitor capacity (resonance parameter) of the power reception side resonance circuit 21 is controlled. As a result, the power supply drive frequency fz can be set in the range of the lagging mode which is a frequency range higher than the resonance frequency fr of the resonance characteristic F1 at that time.

The first to third embodiments may be modified as follows.
As shown in FIG. 8, in the non-contact power feeding apparatus, the power feeding apparatus 1 is provided with the power feeding communication circuit 17, and the power receiving apparatus 2 is provided with the power receiving communication circuit 26. The power receiving device information stored in advance in the storage circuit of the power receiving side control unit 25 of the power receiving device 2 is transmitted to the power feeding device 1 via the power receiving side communication circuit 26. The power receiving side communication circuit 17 receives the power receiving device information and outputs the information to the power feeding side control unit 15. By this, the power supply side control unit 15 may change the processing of the test mode based on the power reception device information to realize more efficient actual power supply.

The power receiving device information includes the following information.
For example, the power reception device information includes information such as the coil diameter, wire diameter, number of turns, coil shape, installation height, inductance of the secondary coil L2 provided in the power reception device 2 and the capacitor capacity of the power reception resonance circuit 21. In this case, the power supply control unit 15 estimates the coupling coefficient between the primary coil L1 and the secondary coil L2 based on the information and data obtained in advance by tests, experiments, calculations, and the like. The feed-side control unit 15 estimates a resonance characteristic F1 (resonance frequency fr) from the estimated coupling coefficient.

As a result, by using the plurality of test drive frequencies ft close to the estimated resonance frequency, the power supply side control unit 15 uses the plurality of test drive frequencies ft to obtain resonance characteristics F1 in the coupled state of the primary coil L1 and the secondary coil L2. The determination of the resonance frequency fr) can be made accurately and in a short time.

Also, for example, the power receiving device information includes information that requests the power feeding device 1 for a desired feed drive frequency fz that is optimal for the feed drive frequency fz. Even in this case, the power supply side control unit 15 can control the capacitor capacity (resonance parameter) of the power supply side resonant circuit 12 to position the desired power supply drive frequency fz in the range of the lagging mode.

Furthermore, for example, the power receiving device information includes information for requesting a desired output power P according to the charging state of the secondary battery 20 at that time. In this case, the power supply apparatus 1 can output the desired output power P to the secondary battery 20 by adjusting the power supply drive frequency fz or adjusting the capacitor capacity of the power supply side resonant circuit 12.

By this, in the electric vehicle non-contact power feeding system, for example, optimal charging can be performed according to the power feeding device information which is different for each vehicle type.
Further, data of the various types of power reception device information described above for each vehicle type is stored in a storage circuit incorporated in the power supply side control unit 15 of the power supply device 1 provided at the power supply station. Then, the power receiving device 2 provided in the electric vehicle may transmit only the vehicle type information of itself to the power feeding device 1 as the power receiving device information.

In each embodiment, one of the plurality of capacitors C1 to C5 is selected when controlling the capacitance (resonance parameter) of the power supply side resonant circuit 12. The feed side control unit 15 may simultaneously select a plurality of capacitors and control the capacitance (resonance parameter) of the feed side resonance circuit 12.

In each of the embodiments, the capacitors C1 to C5 of the power supply resonance circuit 12 have different capacitor capacities, but may have the same capacity. In this case, the feed-side control unit 15 outputs selection control signals SLS1 to SLS5 to the feed-side resonant circuit 12 so that a plurality of capacitors can be simultaneously selected to control the capacitor capacity (resonance parameter) of the feed-side resonant circuit 12. To do.

In each embodiment, the feed side resonance circuit 12 is configured by connecting a plurality of capacitors C1 to C5 in parallel.
On the other hand, as shown in FIG. 9, the feed side resonance circuit 12 may be configured by connecting a plurality of series circuits 30 of the capacitor C0 and the switch Qy1 in a ladder shape via the switch Qy2. The feed-side control unit 15 may adjust the capacitance (resonance parameter) of the feed-side resonant circuit 12 by appropriately selecting and turning on the switches Qy1 and Qy2.

In each embodiment, the feed side resonance circuit 12 is configured by connecting a plurality of capacitors C1 to C5 in parallel.
On the other hand, as shown in FIG. 10, the feed side resonance circuit 12 may be configured by connecting a plurality of resonant coils Lr1 to Lr5 in parallel and connecting a capacitor C0 in series to the parallel circuit. . The feed-side control unit 15 appropriately turns on / off the switches Q1 to Q5 to adjust the inductance (resonance parameter) of the feed-side resonant circuit 12 so that the predetermined feed drive frequency fz is located in the lagging mode. It may be controlled to

Of course, also in this case, the power supply side control unit 15 may simultaneously select a plurality of coils and control the inductance (resonance parameter) of the power supply side resonant circuit 12.
Furthermore, the plurality of coils Lr1 to Lr5 may have inductances of the same value, and the feed-side control unit 15 may simultaneously select the plurality of coils and control the inductance (resonance parameter) of the feed-side resonant circuit 12 .

The power supply side resonance circuit 12 of each embodiment may be configured by a series circuit of a capacitor and a coil.
In each embodiment, when the resonance characteristic F1 has one resonance frequency fr, the power supply side control unit 15 is a phase lag where the power supply drive frequency fz is higher than the resonance frequency fr of the resonance characteristic F1 at that time. The power supply resonance circuit 12 was controlled to be in the range of the mode. If the resonance characteristic has two series resonance points (peaks) and one parallel resonance point (valleys), that is, if it has bimodality, the feed-side control unit 15 determines that the feed drive frequency fz is then The power supply drive frequency fz is lower than one of the two series resonance frequencies of the resonance characteristic so as to be in the range of the slow mode in the frequency range of the high series resonance frequency of the two series resonance frequencies of the resonance characteristic. The feed side resonance circuit 12 may be controlled to be in the range of the lagging mode in the frequency range of the series resonance frequency. Thereby, even when the resonance characteristic is bimodal, hard switching of MOS transistors Qa to Qd for power control in high frequency inverter 11 is avoided, and an increase in loss is prevented and an element damage is also prevented. Be done.

When the feed drive frequency fz is in the range of the slow mode in the frequency range of the high series resonance frequency of the two series resonance frequencies of the resonance characteristic, the high frequency current applied to the primary coil L1 and the secondary coil L2 It is in phase with the high frequency current to be energized. On the other hand, when the power supply drive frequency fz is in the range of the slow mode in the low series resonance frequency range of the two series resonance frequencies of the resonance characteristics, the high frequency current applied to the primary coil L1 and the secondary coil The phase is opposite to that of the high frequency current applied to L2. When the high frequency current applied to the primary coil L1 and the high frequency current applied to the secondary coil L2 are in opposite phase, the unnecessary radiation radiated from the power supply apparatus 1 to the surroundings is the high frequency current applied to the primary coil L1 and It is smaller than the case where the high frequency current supplied to the secondary coil L2 is in phase.

The primary coil L1 and the secondary coil L2 of each embodiment may include a solenoid type coil or a spiral type coil. Solenoid type coils tend to generate greater noise than spiral type coils. For this reason, when the primary coil L1 and the secondary coil L2 include a solenoid type coil, the power supply side control unit 15 operates the power supply drive frequency fz when the resonance characteristic is bimodal. It is preferable to control the feed resonance circuit 12 so as to be in the range of the slow mode in the frequency range of the low series resonance frequency of the two series resonance frequencies. Thereby, the unnecessary radiation radiated to the surroundings from the power feeding device 1 can be reduced. On the other hand, when the primary coil L1 and the secondary coil L2 include a coil of a spiral type, when the resonance characteristic is bimodal and the level of unnecessary radiation falls within the design allowable range, the feed side control unit 15 may control the feed resonance circuit 12 such that the feed drive frequency fz is in the range of the slow phase mode in the frequency range of the high series resonance frequency of the two series resonance frequencies of the resonance characteristics at that time. preferable. Thereby, the control by the power supply side control unit 15 is easier than the control in the case of using a solenoid type coil. Specifically, when a solenoid type coil is used, the feed-side control unit 15 sets the low series resonance of the two series resonance frequencies of the resonance characteristic in the frequency range in which the upper limit frequency and the lower limit frequency are limited. Identify the range of lagging modes in the frequency domain of the frequency. For this reason, the control by the power supply side control unit 15 is complicated. On the other hand, in the case of using a spiral type coil, in the frequency range in which only the lower limit frequency is limited, the feed side control unit 15 in the frequency range of the high series resonance frequency of the two series resonance frequencies of the resonance characteristic at that time. Identify the range of the lagging mode. In this case, the power supply side control unit 15 only needs to lower the frequency to a desired power from a frequency range higher than the range of the phase delay mode, and the control by the power supply side control unit 15 uses a solenoid type coil. It will be easier than that.

As shown in FIG. 11 or 12, the power supply side resonance circuit 12 of each embodiment may be configured of one capacitor Cz and two first and second bidirectional switches Qz1 and Qz2.
Here, each of the bidirectional switches Qz1 and Qz2 may be a GaN (gallium nitride) bidirectional switch device having a double gate composed of the first gate terminal G1 and the second gate terminal G2.

Incidentally, the first bidirectional switch Qz1 (second bidirectional switch Qz2) has four modes changed by the on / off signal supplied to the first gate terminal G1 and the second gate terminal G2.

In the first mode, in the first bidirectional switch Qz1 (second bidirectional switch Qz2), the ON signal is supplied to the first gate terminal G1 and the OFF signal is supplied to the second gate terminal G2, and the high frequency inverter 11 generates a primary coil. In this mode, conduction to L1 is possible.

In the second mode, when an off signal is output to the first gate terminal G1 and an on signal is output to the second gate terminal G2 in the first bidirectional switch Qz1 (second bidirectional switch Qz2), the high frequency power from the primary coil L1 In this mode, conduction to the inverter 11 is possible.

In the third mode, when both the first and second gate terminals G1 and G2 output ON signals to the first bidirectional switch Qz1 (second bidirectional switch Qz2), the primary coil L1 and the high frequency inverter 11 In this mode, conduction in both directions (full conduction) is possible.

In the fourth mode, when both of the first and second gate terminals G1 and G2 output the off signal in the first bidirectional switch Qz1 (second bidirectional switch Qz2), the primary coil L1 and the high frequency inverter 11 In this mode, there is a break (all non-conduction).

The feed side resonance circuit 12 shown in FIG. 11 is a resonance circuit in which a capacitor Cz and a first bidirectional switch Qz1 are connected in series, and a second bidirectional switch Qz2 is connected in parallel to the series circuit.

Further, the feed side resonance circuit 12 shown in FIG. 12 is a resonance circuit in which a capacitor Cz and a first bidirectional switch Qz1 are connected in parallel, and a second bidirectional switch Qz2 is connected in series to the parallel circuit. .

The feed side resonance circuit 12 shown in FIGS. 11 and 12 is operated as follows.
First, both the first and second gate terminals G1 and G2 output an off signal to the first bidirectional switch Qz1, and the first bidirectional switch Qz1 is switched to the fourth mode and turned off. On the other hand, the second bidirectional switch Qz2 outputs the on signal to both the first and second gate terminals G1 and G2 to be in the third mode and turned on. As a result, both terminals of the feed side resonance circuit 12 are shorted.

Next, the second bidirectional switch Qz2 outputs the off signal to both the first and second gate terminals G1 and G2 to be in the fourth mode and turned off. On the other hand, the first bidirectional switch Qz1 outputs the on signal from the off signal to the first gate terminal G1 to be in the first mode, and the high frequency inverter 11 can be brought into conduction from the primary coil L1. By this, the capacitor Cz starts charging.

Then, when the predetermined charging time has elapsed, the second bidirectional switch Qz2 becomes the fourth mode and maintains the off state while the off signal is outputted to both the first and second gate terminals G1 and G2. On the other hand, in the first bidirectional switch Qz1, the on signal is outputted from the on signal to the first gate terminal G1, and the on signal is outputted from the off signal to the second gate terminal G2 to become the second mode, and It will be in the state in which conduction from coil L1 to high frequency inverter 11 is possible. By this, the capacitor Cz starts discharging.

Then, when a predetermined discharge time has elapsed, the first bidirectional switch Qz1 outputs an on signal to both the first and second gate terminals G1 and G2 to be in the third mode and to be short-circuited. On the other hand, an ON signal is output to both the first and second gate terminals G1 and G2 of the second bidirectional switch Qz2, and the second bidirectional switch Qz2 is in the third mode to be short-circuited.

As a result, both the first and second bidirectional switches Qz1 and Qz2 become fully conductive, and the residual charge of the capacitor Cz is discharged.
The above operation is performed one or more times during one cycle of the high frequency current (driving frequency fz for feeding), and the charge and discharge time is controlled. As a result, the apparent capacitance of the capacitor Cz, that is, the capacitance (resonance parameter) of the power supply resonance circuit 12 shown in FIGS. 11 and 12 can be varied.

In the third embodiment, one of the plurality of capacitors Cx1 to Cx5 is selected when controlling the capacitor capacity (resonance parameter) of the power receiving side resonance circuit 21. This may be implemented so that the power reception side control unit 25 can simultaneously select a plurality of capacitors and control the capacitance (resonance parameter) of the power reception side resonance circuit 21.

In the third embodiment, the capacitors Cx1 to Cx5 of the power receiving side resonance circuit 21 have different capacitor capacities, but may have the same capacity. In this case, the power receiving side control unit 25 outputs selection control signals SLSx1 to SLSx5 to the power receiving side resonant circuit 21 so that a plurality of capacitors can be selected simultaneously and the capacitor capacity (resonance parameter) of the power receiving side resonant circuit 21 can be controlled. It may be configured to

In the third embodiment, the power receiving side resonance circuit 21 is configured by connecting a plurality of capacitors Cx1 to Cx5 in parallel.
On the other hand, as shown in FIG. 13, the power reception side resonance circuit 21 may be configured by connecting a plurality of resonance coils Lx1 to Lx5 in parallel and connecting a capacitor Cx0 in series in the parallel circuit. The power reception side control unit 25 may adjust the inductance (resonance parameter) of the power reception side resonance circuit 21 by appropriately turning on and off the switches Qx1 to Qx5.

Of course, also in this case, the power reception side control unit 25 may simultaneously select a plurality of coils and control the inductance (resonance parameter) of the power reception side resonance circuit 21.
Furthermore, the plurality of coils Lx1 to Lx5 may have inductances of the same value, and the power reception side control unit 25 may simultaneously select a plurality of coils and control the inductance (resonance parameter) of the power reception side resonance circuit 21. .

The power receiving side resonance circuit 21 of the second embodiment may be configured by a series circuit of a capacitor and a coil.
Alternatively, the power reception side resonance circuit 21 may have a circuit configuration shown in FIG. 11 or 12, and the power reception side control unit 25 may adjust the capacitance (resonance parameter) of the power reception side resonance circuit 21.

In each of the embodiments, the capacitor capacity (resonance parameter) of either the power supply resonance circuit 12 or the power reception resonance circuit 21 is controlled. However, the capacitor capacity of both the power supply resonance circuit 12 and the power reception resonance circuit 21 (resonance) Parameters) may be controlled.

Claims

A power supply apparatus including a power supply resonance circuit and a primary coil connected to the power supply resonance circuit, a power reception resonance circuit, and a power reception resonance circuit, which is connected to the power reception resonance circuit, and using magnetic energy from the primary coil Control method of non-contact power feeding device comprising: power receiving device including: secondary coil capable of receiving power; and rectifying circuit for rectifying power received by the secondary coil to generate output power and supplying the power to load And
A method of specifying the resonance frequency of the resonance characteristic in the coupled state of the primary coil and the secondary coil at that time by causing the primary coil to be energized with high frequency current of each of a plurality of test drive frequencies, or the load A control method of a non-contact power feeding device using at least one method of specifying a resonance frequency of a resonance characteristic in a coupling state of the primary coil and the secondary coil based on supplied output power.
In the control method of the non-contact power feeding device according to claim 1,
When the primary coil is energized with high frequency current of each of a plurality of test drive frequencies, based on the primary current flowing to the primary coil, the coupled state of the primary coil and the secondary coil at that time The control method of the non-contact electric power supply which comprises identifying the resonant frequency of a resonance characteristic.
In the control method of the non-contact power feeding device according to claim 1,
In the coupled state of the primary coil and the secondary coil at that time based on the output power supplied to the load when the primary coil is energized by each high frequency current of a plurality of test drive frequencies The control method of the non-contact electric power supply which comprises identifying the resonant frequency of a resonance characteristic.
In the control method of the non-contact power feeding device according to claim 1,
When energizing the primary coil with high frequency current of each of a plurality of test drive frequencies, the primary current flowing through the primary coil or the output power supplied to the load by energizing the primary coil Identifying the resonance frequency of the resonance characteristic in the coupled state of the primary coil and the secondary coil at that time, based on
A contactless power supply device comprising: controlling a resonance parameter of at least one of the power supply resonance circuit and the power reception resonance circuit based on a resonance frequency of the specified resonance characteristic to bias a resonance frequency of the resonance characteristic. Control method.
In the control method of the non-contact power feeding device according to claim 1,
Specifying a resonance frequency of a resonance characteristic in a coupled state of the primary coil and the secondary coil at that time by energizing the primary coil with a high frequency current of each of a plurality of test drive frequencies;
Based on the resonance frequency of the identified resonance characteristic, the power supply resonance circuit or the power reception resonance such that the power supply drive frequency is located in the range of the slow mode of the frequency range higher than the resonance frequency of the resonance characteristic. Controlling at least one resonance parameter of the circuit to bias the resonance frequency of the resonance characteristic;
A control method of a non-contact power feeding device comprising starting feeding by energizing the primary coil with a high frequency current of the feeding drive frequency after biasing a resonance frequency of a resonance characteristic.
It is a noncontact power feeding device, and
A feed device including a feed side resonance circuit and a primary coil connected to the feed side resonance circuit;
A power receiving resonance circuit, a secondary coil connected to the power receiving resonance circuit and capable of receiving power from the primary coil using magnetic energy, and power rectified by the power received by the secondary coil A power receiving device including a rectifier circuit that generates power and supplies the load;
A high frequency inverter for generating a high frequency current to be supplied to the primary coil;
A test drive control circuit for generating high frequency current of each of a plurality of test drive frequencies to the high frequency inverter, and energizing the primary coil with each of the generated high frequency currents of the test drive frequency;
A resonant frequency identification circuit for identifying a resonant frequency of a resonant characteristic in a coupled state of the primary coil and the secondary coil when the primary coil is energized with a high frequency current of each of a plurality of test drive frequencies;
The resonance parameter of at least one of the power supply resonance circuit and the power reception resonance circuit is controlled such that the power supply drive frequency falls within the range of the slow phase mode of a frequency range higher than the resonance frequency of the specified resonance characteristic. And a parameter control circuit that biases the resonance frequency of the resonance characteristic.
In the non-contact power feeding device according to claim 6,
The power feeding device is
And a primary current detection circuit for detecting a primary current flowing through the primary coil when the primary coil is energized with a high frequency current of each of a plurality of test drive frequencies,
The resonance frequency identification circuit is provided in the power feeding apparatus, and based on a primary current detected by a primary current detection circuit, resonance of resonance characteristics in a coupled state of the primary coil and the secondary coil at that time. Contactless power supply that specifies the frequency.
In the non-contact power feeding device according to claim 6,
The resonant frequency identification circuit is configured to generate the primary coil and the secondary at that time based on output power supplied to the load by energizing the primary coil with high frequency current of each of a plurality of test drive frequencies. A noncontact power feeding device that specifies a resonant frequency of a resonant characteristic in a coupled state with a coil.
In the non-contact power feeding device according to claim 8,
The power receiving device is
An output power detection circuit that detects output power output to the load and generates output power information;
A power receiving side communication circuit for transmitting output power information supplied from the output power detection circuit to the power feeding device;
The non-contact power feeding device according to claim 1, wherein the power feeding device includes a power feeding side communication circuit that receives the output power information from the power receiving side communication circuit and outputs the output power information to the resonant frequency identification circuit.
The noncontact power feeding device according to any one of claims 6 to 9,
The feed side resonant circuit includes a variable capacitor connected in series to the primary coil,
The non-contact power supply device, wherein the resonance parameter includes a capacitance of the variable capacitor.
The noncontact power feeding device according to any one of claims 6 to 10,
The feed side resonant circuit includes a variable coil connected in series to the primary coil,
The contactless power supply device, wherein the resonance parameter includes an inductance of a variable coil.
In the non-contact power feeding device according to any one of claims 6 to 11,
The power receiving side resonance circuit includes a variable capacitor connected in series to the secondary coil,
The non-contact power supply device, wherein the resonance parameter includes a capacitance of the variable capacitor.
The noncontact power feeding device according to any one of claims 6 to 12
The power receiving side resonance circuit includes a variable coil connected in series to the secondary coil,
The non-contact power feeding device, wherein the resonance parameter includes an inductance of the variable coil.
The noncontact power feeding device according to any one of claims 6 to 12
The power receiving device is
A power receiving side communication circuit, and a power receiving side control circuit that stores power receiving device information of the own and transmits the power receiving device information to the power feeding device via the power receiving side communication circuit;
The power feeding device is
A power supply communication circuit that receives the power reception device information transmitted from the power reception communication circuit, the test drive control circuit based on the power reception device information received by the power communication circuit, the resonance frequency identification circuit And a control circuit for controlling at least one processing operation of the parameter control circuit.