JP6249287B2 - Non-contact power feeding device and method for measuring leakage magnetic field of non-contact power feeding device - Google Patents

Description

  The present invention relates to a contactless power supply device and a leakage magnetic field measurement method for the contactless power supply device.

  Conventionally, electromagnetic induction type non-contact power feeding devices have a metal plate or electromagnetic shield around them as a measure to prevent some of the alternating magnetic field radiated from the primary coil being fed from leaking and spreading unwanted noise around it. There is a thing given to.

  Moreover, in patent document 1, it arrange | positions to a some leakage magnetic flux detection coil around the electric power feeding coil. Based on the detection results of the plurality of leakage magnetic flux detection coils, the shift between the power feeding coil and the electric device such as the portable terminal receiving power feeding is grasped. And the electric power feeding method of performing the efficient electric power feeding which controlled according to the shift | offset | difference with a feeding coil and the electric equipment which receives electric power feeding, and reduced the leakage magnetic flux is proposed.

  In Patent Document 2, two transmitting coils are stacked. And the electric power feeding method which reduces the unnecessary leakage magnetic flux by changing the phase of the transmission electric current sent through both the transmission side coils, and supplies electric power efficiently with respect to a receiving coil is proposed.

Japanese Patent No. 5121307 JP 2013-172490 A

However, in Patent Document 1, it is necessary to change the control amount for the power feeding coil in accordance with the detection results of the plurality of leakage flux detection coils. Moreover, Oite it is difficult to suppress the strong becomes leakage magnetic flux alternating magnetic field in a non-contact power feeding device having an increased supply capacity because not reduce aggressive leakage flux.

Moreover, in patent document 2, since the phase of the transmission current sent through the two transmission side coils is adjusted, the power supply performance itself is deteriorated, and there is a problem in increasing the power supply capability.
The present invention has been made in order to solve the above-described problem, and an object of the present invention is to provide a non-contact power supply apparatus and a non-contact power supply that can actively reduce a leakage alternating magnetic field without performing control for power supply. An object of the present invention is to provide a method for measuring a leakage magnetic field of a power feeding device.

  In the non-contact power supply apparatus for solving the above-described problem, when an electric device is disposed in a primary coil that is supplied with a high-frequency current for power supply and radiates an alternating magnetic field for power supply, the primary coil is the alternating magnetic field. Is a non-contact power feeding device in which secondary power is generated in a secondary coil of a power receiving device provided in the electric device by electromagnetic induction, and a part of the alternating magnetic field for power feeding is externally provided. One or more leakage magnetic field detection coils that detect a leakage alternating magnetic field that leaks and output as a leakage detection signal; and one or more leakage magnetic field reduction coils that generate an alternating magnetic field for reducing a leakage magnetic field that reduces the leakage alternating magnetic field; Based on the leakage detection signal, a high frequency current for leakage magnetic field reduction that generates the alternating magnetic field for reducing the leakage magnetic field for canceling and reducing the leakage alternating magnetic field is calculated, and the leakage magnetic field reduction for the calculated leakage magnetic field is calculated. Energizing the one or more leakage magnetic field reduction coil at frequency current, characterized in that a control means for radiating an alternating magnetic field for leakage magnetic field reduction from the one or more leakage magnetic field reduction coil.

  In the above configuration, a plurality of the primary coils are provided in a one-dimensional direction or a two-dimensional direction, and the leakage magnetic field detection coil is radiated from a plurality of primary coils provided in the one-dimensional direction or the two-dimensional direction. A leakage magnetic field reduction that detects a leakage alternating magnetic field of the alternating magnetic field that is detected, and the leakage magnetic field reduction coil reduces the leakage alternating magnetic field of the alternating magnetic field radiated from a plurality of primary coils provided in the one-dimensional direction or two-dimensional direction. An alternating magnetic field is generated for the leakage magnetic field reduction coil based on a leakage detection signal from each leakage magnetic field detection coil, and the control means calculates the leakage magnetic field reducing high-frequency current, It is preferable to energize with the calculated high-frequency current for reducing the leakage magnetic field.

  In the above configuration, a plurality of the primary coils are provided in a one-dimensional direction or a two-dimensional direction, and the leakage magnetic field detection coil is energized with the high-frequency current for feeding among the plurality of primary coils. The leakage magnetic field reduction coil is a primary coil that is not energized with the high-frequency current for feeding among the plurality of primary coils, and is used as the leakage magnetic field detection coil. And the control means obtains the leakage detection signal for the primary coil used as the leakage magnetic field detection coil and calculates the high-frequency current for reducing the leakage magnetic field. The primary coil used as the leakage magnetic field reducing coil is preferably energized with the calculated high frequency current for leakage magnetic field reduction.

  Further, in the above configuration, the leakage magnetic field detection coil is a primary coil adjacent to the primary coil through which the high-frequency current for power feeding is applied, and the leakage magnetic field reduction coil is used as the leakage magnetic field detection coil. Preferably, the primary coil is adjacent to the primary coil.

In the above configuration, the control means inputs a leakage detection signal from the leakage magnetic field detection coil, extracts the frequency and intensity level of the leakage alternating magnetic field from the leakage detection signal, and outputs the leakage magnetic field extraction signal. A leakage magnetic field signal extraction circuit, a leakage magnetic field reduction circuit that generates a high-frequency current for reducing the leakage magnetic field that is passed through the leakage magnetic field reduction coil, and the leakage alternating signal based on the leakage magnetic field extraction signal of the leakage magnetic field signal extraction circuit A control signal for generating a high-frequency current for reducing a leakage magnetic field that radiates an alternating magnetic field for reducing a leakage magnetic field having a frequency that is the same level as that of the magnetic field and having a phase that is 180 degrees out of phase. It is preferable to have the control part which outputs to.

  Further, in the above configuration, the leakage magnetic field signal extraction circuit has a filter circuit that acquires a predetermined frequency component of the leakage alternating magnetic field from the leakage detection signal, and the frequency component acquired by the filter circuit It is preferable to extract the intensity level of the leakage alternating magnetic field.

  Further, in the above configuration, the leakage magnetic field signal extraction circuit has a filter circuit that acquires a predetermined frequency component of a plurality of leakage alternating magnetic fields from the leakage detection signal, and the frequency acquired by each of the plurality of filter circuits. It is preferable to extract the leakage alternating magnetic field having the highest intensity level among the leakage alternating magnetic fields of the components.

  In the above configuration, it is preferable that the leakage magnetic field signal extraction circuit has a variable filter circuit, and the variable filter circuit extracts the frequency component of the leakage alternating magnetic field having the highest intensity level.

  The method for measuring a leakage alternating magnetic field of a non-contact power supply apparatus for solving the above-described problem is that when an electric device is disposed in a primary coil that is supplied with a high-frequency current for power supply and radiates an alternating magnetic field for power supply, A method for measuring a leakage alternating magnetic field of a non-contact power feeding device in which a secondary coil radiates the alternating magnetic field and generates secondary power in a secondary coil of a power receiving device provided in the electric device by electromagnetic induction, One or more leakage magnetic field detection coils that detect a leakage alternating magnetic field in which a part of the alternating magnetic field for power supply leaks to the outside and output as a leakage detection signal are provided at a position separated from the primary coil by a predetermined distance. The leakage detection signal is output to a leakage magnetic field signal extraction circuit, and the leakage magnetic field signal extraction circuit extracts the strength level of the leakage alternating magnetic field from the leakage detection signal.

  In the above configuration, the one or more leakage magnetic field detection coils are provided on the non-contact power feeding device side or the power receiving device side, and when provided on the power receiving device side, the communication means provided on the non-contact power feeding device and the power receiving device. The leakage detection signal of the leakage magnetic field detection coil provided on the power receiving device side is preferably output to the magnetic field signal extraction circuit provided on the non-contact power supply device side.

  According to the present invention, it is possible to actively reduce the leakage alternating magnetic field without performing control for power feeding.

The whole perspective view showing the non-contact electric supply device and electric equipment for explaining a 1st embodiment. Similarly, explanatory drawing which shows the arrangement | positioning state of the primary coil provided in the electric power feeding area, the 1st and 2nd leakage magnetic field detection coil, and the 1st and 2nd leakage magnetic field reduction coil. Similarly, the electrical block circuit diagram of a non-contact electric power feeder and an electric equipment. Similarly, the electric block circuit diagram for demonstrating a electric power feeding unit circuit. Similarly, the electrical circuit diagram for demonstrating an inverter circuit. The electric block circuit diagram of the non-contact electric power feeder for demonstrating 2nd Embodiment. Similarly, the electrical circuit diagram of a 1st and 2nd selection switch circuit.

(First embodiment)
Hereinafter, a first embodiment of a non-contact power feeding device will be described with reference to the drawings.
FIG. 1 is an overall perspective view of a non-contact power feeding device (hereinafter referred to as a power feeding device) 1 and an electric device (hereinafter referred to as a device) E that receives non-contact power feeding from the power feeding device 1.

  The power feeding device 1 has a casing 2 that is long in one direction, and has a mounting surface 3 on which an upper surface is flat and a device E is mounted. On the mounting surface 3, a plurality (six in FIG. 1) of rectangular power feeding areas AR are defined in the longitudinal direction.

  In addition, the mounting surface 3 has a first leakage magnetic field detection area ARx1 defined on one side (one side) of the six power feeding areas AR arranged in the longitudinal direction, and on the other side (the other side). A second leakage magnetic field detection area ARx2 is defined. Further, on the mounting surface 3, a first leakage magnetic field reduction area ARy1 is formed outside the first leakage magnetic field detection area ARx1, and a second leakage magnetic field reduction area is formed outside the second leakage magnetic field detection area ARx2. ARy2 is partitioned.

(Primary coil L1)
As shown in FIG. 2, a primary coil L <b> 1 wound in a square shape in accordance with the planar shape of the power supply area AR is arranged in the housing 2 at a position corresponding to each power supply area AR. ing. The primary coil L1 of each power supply area AR is connected to each power supply unit circuit 10 (see FIG. 3) provided in the housing 2 for each power supply area AR. And the primary coil L1 of each electric power feeding area AR radiates | emits an alternating magnetic field when the high frequency current of the frequency for electric power feeding is supplied with the electric power feeding unit circuit 10 corresponding.

  Each primary coil L <b> 1 alone or together with another primary coil L <b> 1 is energized with a high-frequency current at a power feeding frequency, and is installed in a device E placed on the placement surface 3 (power feeding area AR). Non-contact power feeding is performed to the next coil L2. That is, when the device E is mounted on the mounting surface 3 of the housing 2, the secondary coil L2 provided in the device E is for power supply that the primary coil L1 radiates based on the high-frequency current of the power supply frequency. An induced electromotive force (secondary power) based on electromagnetic induction is generated by an alternating magnetic field having a frequency.

Each primary coil L1 is energized with a high-frequency current having a device detection frequency for detecting whether the device E is placed in the power supply area AR.
(First and second leakage magnetic field detection coils LA1, LA2)
As shown in FIG. 2, the casing 2 is wound in a rectangular shape at a position corresponding to the first leakage magnetic field detection area ARx1 in accordance with the outer shape of the first leakage magnetic field detection area ARx1. A first leakage magnetic field detection coil LA1 is arranged. The first leakage magnetic field detection coil LA1 is generated by electromagnetic induction by interlinking with a leakage alternating magnetic field (leakage magnetic flux) radiated to the outside by leaking a part of the alternating magnetic field radiated by the primary coil L1 being fed. The induced electromotive force to be output is output as the first leakage detection signal SG1.

  Similarly, at a position corresponding to the second leakage magnetic field detection area ARx2, a second leakage magnetic field detection coil LA2 wound in a square shape in accordance with the outer shape of the second leakage magnetic field detection area ARx2 is disposed. . The second leakage magnetic field detection coil LA2 is generated by electromagnetic induction by interlinking with a leakage alternating magnetic field (leakage magnetic flux) radiated to the outside due to leakage of a part of the alternating magnetic field radiated by the primary coil L1 being fed. The induced electromotive force to be output is output as the second leakage detection signal SG2.

(First and second leakage magnetic field reduction coils LB1, LB2)
As shown in FIG. 2, the casing 2 is wound in a rectangular shape at a position corresponding to the first leakage magnetic field reduction area ARy1 in accordance with the outer shape of the first leakage magnetic field reduction area ARy1. A first leakage magnetic field reduction coil LB1 is arranged. Similarly, at a position corresponding to the second leakage magnetic field reduction area ARy2, a second leakage magnetic field reduction coil LB2 wound in a square shape in accordance with the outer shape of the second leakage magnetic field reduction area ARy2 is disposed. .

  The first leakage magnetic field reduction coil LB1 is energized with a high frequency current for leakage magnetic field reduction based on the noise detection result of the first leakage magnetic field detection coil LA1. The first leakage magnetic field reduction coil LB1 is an alternating power for reducing a leakage alternating magnetic field (leakage magnetic flux) that is partially leaked from the power feeding area AR during power feeding and is radiated to the outside on the first leakage magnetic field detection coil LA1 side. Radiates a magnetic field.

  The second leakage magnetic field reduction coil LB2 is supplied with a high frequency current for leakage magnetic field reduction based on the noise detection result of the second leakage magnetic field detection coil LA2. The second leakage magnetic field reduction coil LB2 is an alternating magnetic field for reducing an alternating magnetic field (leakage magnetic flux) radiated to the outside on the second leakage magnetic field detection coil LA2 side when a part leaks from the power feeding area AR during power feeding. Radiate.

Next, the electrical configuration of the power feeding device 1 and the device E will be described with reference to FIG.
(Equipment E)
First, the device E will be described. In FIG. 3, the device E includes a power receiving circuit 5 as a power receiving device that receives secondary power from the power feeding device 1 and a load Z.

As illustrated in FIG. 3, the power receiving circuit 5 includes a rectifier circuit 6.
The rectifier circuit 6 is connected to a secondary circuit on the device E side that is a series circuit of a secondary coil L2 and a secondary side resonance capacitor C2. The secondary coil L2 generates secondary power based on the alternating magnetic field of the feeding frequency radiated from the primary coil L1, and outputs the secondary power to the rectifier circuit 6.

The rectifier circuit 6 converts secondary power generated in the secondary coil L2 by electromagnetic induction into a DC voltage. The rectifier circuit 6 supplies the converted DC voltage to the load Z of the device E.
(Power supply device 1)
Next, the power feeding device 1 will be described. As illustrated in FIG. 3, the power feeding device 1 includes a power feeding unit circuit 10 provided for each of the six primary coils L1. In addition, the power supply apparatus 1 includes first and second leakage magnetic field signal extraction circuits 21 and 22 provided corresponding to the first and second leakage magnetic field detection coils LA1 and LA2. In addition, the power feeding device 1 includes first and second leakage magnetic field reduction circuits 31 and 32 provided corresponding to the first and second leakage magnetic field reduction coils LB1 and LB2. Furthermore, the power supply apparatus 1 includes a system control unit 40 that performs overall control of the power supply unit circuit 10, the first and second leakage magnetic field signal extraction circuits 21 and 22, and the first and second leakage magnetic field reduction circuits 31 and 32. doing.

(Power supply unit circuit 10)
Each power supply unit circuit 10 exchanges data with the system control unit 40 and is controlled by the system control unit 40. Since each power supply unit circuit 10 has the same circuit configuration, one power supply unit circuit 10 will be described for convenience of explanation.

As illustrated in FIG. 4, the power supply unit circuit 10 includes a drive circuit 11, an inverter circuit 12, a current detection circuit 13, and a device detection circuit 14.
(Drive circuit 11)
The drive circuit 11 generates a control signal for generating a power supply high-frequency current frequency (power supply frequency) and a device detection high-frequency current frequency (device detection frequency) flowing from the system control unit 40 to the primary coil L1. Enter CT. The drive circuit 11 receives the control signal CT and generates drive signals PSa and PSb that are output to the inverter circuit 12. The drive signals PSa and PSb are drive signals that set the frequency of the high-frequency current for power supply or device detection that flows through the primary coil L1 based on the control signal CT.

(Inverter circuit 12)
As shown in FIG. 5, the inverter circuit 12 is a known half-bridge circuit. The inverter circuit 12 includes a voltage dividing circuit in which a first capacitor Ca and a second capacitor Cb are connected in series, and a series circuit in which a first power transistor Qa and a second power transistor Qb are connected in series to the voltage dividing circuit. Are connected in parallel. In the present embodiment, the first and second power transistors Qa and Qb are configured by N-channel MOSFETs.

  A primary circuit on the power feeding device 1 side is formed between a connection point N1 between the first capacitor Ca and the second capacitor Cb and a connection point N2 between the first power transistor Qa and the second power transistor Qb. A series circuit of the secondary coil L1 and the primary side resonance capacitor C1 is connected.

  Drive signals PSa and PSb are input from the drive circuit 11 to the gate terminals of the first power transistor Qa and the second power transistor Qb. The first and second power transistors Qa and Qb are alternately turned on and off based on drive signals PSa and PSb respectively input to their gate terminals.

  As a result, the inverter circuit 12 generates either a high-frequency current at the power supply frequency or a high-frequency current at the device detection frequency by the drive signals PSa and PSb based on the control signal CT. The primary coil L1 generates an alternating magnetic field when this high-frequency current is applied.

  Here, the power supply frequency is a resonance frequency determined by an inductance component and a capacitance component on the device E side when the device E is placed in the power supply area AR. On the other hand, the device detection frequency is a frequency based on the resonance frequency determined by the inductance component and the capacitance component of the primary circuit on the power supply device 1 side when the device E is not placed in the power supply area AR. Note that the power feeding frequency and the device detection frequency are obtained in advance through tests, experiments, calculations, and the like.

(Current detection circuit 13)
As shown in FIG. 4, the current detection circuit 13 is provided between the primary coil L1 constituting the primary circuit and the primary side resonance capacitor C1, and detects the primary current at that time flowing through the primary coil L1. And output as a current detection signal.

(Device detection circuit 14)
As shown in FIG. 4, the device detection circuit 14 is connected to the current detection circuit 13. The device detection circuit 14 inputs the current detection signal detected by the current detection circuit 13 while the primary coil L1 is energized with a high-frequency current having a device detection frequency. Then, the device detection circuit 14 converts the output voltage relative to the input current detection signal, and determines whether or not the device E is placed on the primary coil L1 (power feeding area AR).

  The device detection circuit 14 includes an envelope detection circuit, and detects the current detection signal of the current detection circuit 13 by the envelope detection circuit. That is, the device detection circuit 14 (envelope detection circuit) generates an envelope waveform signal (output voltage) that wraps the outside of the current detection signal from the current detection signal.

  When the output voltage falls below a predetermined reference value, the device detection circuit 14 determines that the device E is placed on the primary coil L1 (power feeding area AR), and uses the determination signal SJ as the system control unit 40. To output. Further, when the output voltage exceeds a predetermined reference value, the device detection circuit 14 determines that the device E is not placed on the primary coil L1 (power feeding area AR), and the determination signal SJ Is output to the system control unit 40.

(First and second leakage magnetic field signal extraction circuits 21, 22)
As shown in FIG. 3, the power supply apparatus 1 is provided with first and second leakage magnetic field signal extraction circuits 21 and 22 corresponding to the first and second leakage magnetic field detection coils LA1 and LA2.

(First leakage magnetic field signal extraction circuit 21)
The first leakage magnetic field signal extraction circuit 21 is connected to the first leakage magnetic field detection coil LA1. The first leakage magnetic field signal extraction circuit 21 receives the first leakage detection signal SG1 detected by the first leakage magnetic field detection coil LA1. The first leakage magnetic field signal extraction circuit 21 has a filter circuit. This filter circuit assumes that the frequency of the leakage alternating magnetic field is the same as the power supply frequency of the alternating magnetic field for power supply since the frequency of the alternating magnetic field for power supply leaks, and supplies power from the first leakage detection signal SG1. It is a filter circuit which acquires the signal waveform of the leakage alternating magnetic field of the frequency for use.

  The first leakage magnetic field signal extraction circuit 21 extracts the strength level of the leakage alternating magnetic field (leakage magnetic flux) from the power supply frequency signal waveform in the first leakage detection signal SG1 acquired through the filter circuit. The leakage magnetic field extraction signal SN1 is output to the system control unit 40.

(Second leakage magnetic field signal extraction circuit 22)
The second leakage magnetic field signal extraction circuit 22 is connected to the second leakage magnetic field detection coil LA2. The second leakage magnetic field signal extraction circuit 22 receives the second leakage detection signal SG2 detected by the second leakage magnetic field detection coil LA2. The second leakage magnetic field signal extraction circuit 22 has a filter circuit. This filter circuit assumes that the frequency of the leakage alternating magnetic field is the same as the power supply frequency of the alternating magnetic field for power supply since the frequency of the alternating magnetic field for power supply leaks, and supplies power from the first leakage detection signal SG1. It is a filter circuit which acquires the signal waveform of the leakage alternating magnetic field of the frequency for use.

  Then, the second leakage magnetic field signal extraction circuit 22 extracts the strength level of the leakage alternating magnetic field (leakage magnetic flux) from the signal waveform of the power feeding frequency in the second leakage detection signal SG2 obtained through the filter circuit. The leaked magnetic field extraction signal SN2 is output to the system control unit 40.

(First and second leakage magnetic field reduction circuits 31, 32)
As shown in FIG. 3, the power supply apparatus 1 is provided with first and second leakage magnetic field reduction circuits 31 and 32 corresponding to the first and second leakage magnetic field reduction coils LB1 and LB2.

(First leakage magnetic field reduction circuit 31)
The first leakage magnetic field reduction circuit 31 exchanges data with the system control unit 40 and is controlled by the system control unit 40.

  The first leakage magnetic field reduction circuit 31 is connected to the first leakage magnetic field reduction coil LB1. The first leakage magnetic field reduction circuit 31 generates a high-frequency current for reducing the leakage magnetic field based on the first control signal CT1 from the system control unit 40. The high-frequency current for reducing the leakage magnetic field is the same as the leakage alternating magnetic field (leakage magnetic flux) detected by the first leakage magnetic field detection coil LA1 and the alternating magnetic field of the feeding frequency having the same phase level and shifted by 180 degrees. 1 A high-frequency current for radiating from the leakage magnetic field reduction coil LB1.

  The first leakage magnetic field reduction circuit 31 has a circuit similar to the drive circuit 11 and the inverter circuit 12 of the power supply unit circuit 10. Then, the high-frequency current for radiating the alternating magnetic field of the feeding frequency whose phase is shifted by 180 degrees is output from the drive signals PSa and PSb (see FIG. 5) output to the inverter circuit in the first leakage magnetic field reduction circuit 31. Generated by controlling timing. Further, the high-frequency current for radiating the alternating magnetic field having the same strength level as the leakage alternating magnetic field is generated by controlling the DC voltage Vdd (see FIG. 5) applied to the inverter circuit in the first leakage magnetic field reduction circuit 31. Is done.

  The first leakage magnetic field reduction circuit 31 energizes the first leakage magnetic field reduction coil LB1 with the generated high frequency current for leakage magnetic field reduction. Therefore, the first leakage magnetic field reduction coil LB1 is energized with a high frequency current for leakage magnetic field reduction, thereby reducing or eliminating the leakage alternating magnetic field (leakage magnetic flux) detected by the first leakage magnetic field detection coil LA1.

(Second leakage magnetic field reduction circuit 32)
The second leakage magnetic field reduction circuit 32 exchanges data with the system control unit 40 and is controlled by the system control unit 40.

  The second leakage magnetic field reduction circuit 32 is connected to the second leakage magnetic field reduction coil LB2. The second leakage magnetic field reduction circuit 32 generates a high frequency current for reducing the leakage magnetic field based on the second control signal CT2 from the system control unit 40. This high-frequency current for reducing the leakage magnetic field is the same as the leakage alternating magnetic field (leakage magnetic flux) detected by the second leakage magnetic field detection coil LA2 and the alternating magnetic field of the feeding frequency that is 180 degrees out of phase. 2 A high-frequency current for radiating from the leakage magnetic field reduction coil LB2.

  Incidentally, the second leakage magnetic field reduction circuit 32 has the same circuits as the drive circuit 11 and the inverter circuit 12 of the power supply unit circuit 10, similarly to the first leakage magnetic field reduction circuit 31. Then, the high-frequency current for radiating the alternating magnetic field of the feeding frequency whose phase is shifted by 180 degrees is output from the drive signals PSa and PSb (see FIG. 5) output to the inverter circuit in the second leakage magnetic field reduction circuit 32. Generated by controlling timing. Further, the high-frequency current for radiating the alternating magnetic field having the same strength level as the leakage alternating magnetic field is generated by controlling the DC voltage Vdd (see FIG. 5) applied to the inverter circuit in the second leakage magnetic field reduction circuit 32. Is done.

  Then, the second leakage magnetic field reduction circuit 32 energizes the second leakage magnetic field reduction coil LB2 with the generated high frequency current for leakage magnetic field reduction. Accordingly, the second leakage magnetic field reduction coil LB2 is energized with a high frequency current for reducing the leakage magnetic field, thereby reducing or eliminating the leakage alternating magnetic field (leakage magnetic flux) detected by the second leakage magnetic field detection coil LA2.

(System control unit 40)
As illustrated in FIGS. 3 and 4, the power supply apparatus 1 includes a system control unit 40. The system control unit 40 includes a microcomputer, and according to the control program of the microcomputer, the six power supply unit circuits 10, the first and second leakage magnetic field signal extraction circuits 21 and 22, the first and second leakage magnetic field reduction circuits 31. , 32 are collectively controlled.

  The system control unit 40 outputs a control signal CT for generating a high-frequency current of a device detection frequency to the power supply unit circuit 10 in a state where the device E is not placed in the power supply area AR. And the system control part 40 inputs the determination signal SJ from the apparatus detection circuit 14 in the state with which the primary coil L1 was supplied with the high frequency current of the frequency for apparatus detection.

  When the determination signal SJ on which the device E is placed is input, the system control unit 40 outputs a control signal CT for generating a high-frequency current having a power supply frequency to the power supply unit circuit 10. The power feeding unit circuit 10 generates a high frequency current having a power feeding frequency, and energizes the primary coil L1 with the generated high frequency current having the power feeding frequency. As a result, the primary coil L1 energized with a high-frequency current at the power feeding frequency radiates an alternating magnetic field at the power feeding frequency, and is not in contact with the secondary coil L2 of the device E placed in the power feeding area AR. Supply power.

  On the contrary, when the determination signal SJ on which the device E is not placed is input, the system control unit 40 outputs a control signal CT for generating a high-frequency current having a device detection frequency to the power supply unit circuit 10. To do. That is, the system control unit 40 outputs a control signal CT for continuing device detection to the power supply unit circuit 10.

  The system control unit 40 also includes first and second leakage magnetic field reduction circuits 31 and 32 based on the first and second leakage magnetic field extraction signals SN1 and SN2 from the first and second leakage magnetic field signal extraction circuits 21 and 22. To control each.

  The system control unit 40 inputs the first and second leakage magnetic field extraction signals SN1 and SN2 from the first and second leakage magnetic field signal extraction circuits 21 and 22, respectively, while supplying power to the device E. The system control unit 40 determines the strength level of the leakage alternating magnetic field (leakage magnetic flux) of the feeding frequency detected by the first and second leakage magnetic field detection coils LA1 and LA2 based on the first and second leakage magnetic field extraction signals SN1 and SN2. Identify each.

  More specifically, the system control unit 40 has the same strength level as the leakage alternating magnetic field (leakage magnetic flux) detected by the first leakage magnetic field detection coil LA1 based on the first leakage magnetic field extraction signal SN1, and the phase is 180 degrees. The high-frequency current for reducing the leakage magnetic field of the shifted feeding frequency is calculated. The system control unit 40 outputs a first control signal CT1 for generating the calculated high-frequency current for reducing the leakage magnetic field to the first leakage magnetic field reduction circuit 31. As a result, the first leakage magnetic field reduction coil LB1 is energized with the high frequency current for leakage magnetic field reduction.

  On the other hand, the system control unit 40 has the same strength level as the leakage alternating magnetic field (leakage magnetic flux) detected by the second leakage magnetic field detection coil LA2 based on the second leakage magnetic field extraction signal SN2, and the phase is shifted by 180 degrees. The high-frequency current for reducing the leakage magnetic field at the power feeding frequency is calculated. The system control unit 40 outputs a second control signal CT2 for generating the calculated high-frequency current for reducing the leakage magnetic field to the second leakage magnetic field reduction circuit 32. As a result, the second leakage magnetic field reduction coil LB2 is energized with the high frequency current for leakage magnetic field reduction.

Next, the operation of the power feeding device 1 configured as described above will be described.
Now, when the power supply device 1 is turned on, the system control unit 40 performs device detection as to whether or not the device E is placed.

  That is, the system control unit 40 controls each power supply unit circuit 10 and energizes all six primary coils L1 in turn with a high-frequency current having a device detection frequency. And the system control part 40 inputs the determination signal SJ from the apparatus detection circuit 14 of each electric power feeding unit circuit 10 whether the apparatus E is mounted in each primary coil L1 in order.

  Here, for example, when it is determined that the device E (secondary coil L2) is placed on the fifth primary coil L1 (power feeding area AR) counted from the first leakage magnetic field detection coil LA1, system control is performed. The unit 40 energizes the primary coil L1 with a high-frequency current having a power feeding frequency. As a result, the fifth primary coil L1 is energized with a high-frequency current having a power feeding frequency, so that power feeding to the device E is started.

When the power supply is started, the system control unit 40 waits for the first and second leakage magnetic field extraction signals SN1 and SN2 from the first and second leakage magnetic field signal extraction circuits 21 and 22.
At this time, when the first leakage magnetic field detection coil LA1 detects a leakage alternating magnetic field (leakage magnetic flux), the first leakage magnetic field extraction signal SN1 from the first leakage magnetic field signal extraction circuit 21 is output to the system control unit 40. Based on the first leakage magnetic field extraction signal SN1, the system control unit 40 has the same strength level as the leakage alternating magnetic field (leakage magnetic flux) detected by the first leakage magnetic field detection coil LA1 and has a phase shifted by 180 degrees. The high frequency current for reducing the leakage magnetic field of the frequency is calculated. Then, the system control unit 40 generates a high frequency current for reducing the leakage magnetic field calculated by the first leakage magnetic field reduction circuit 31, and energizes the first leakage magnetic field reduction coil LB1 with the high frequency current for reducing the leakage magnetic field. Let

  As a result, an alternating magnetic field having the same strength level as the leakage alternating magnetic field (leakage magnetic flux) detected by the first leakage magnetic field detection coil LA1 from the first leakage magnetic field reduction coil LB1 and having a phase shifted by 180 degrees is radiated. Is done. As a result, the leakage alternating magnetic field (leakage magnetic flux) detected by the first leakage magnetic field detection coil LA1 is canceled or reduced or eliminated by the alternating magnetic field radiated from the first leakage magnetic field reduction coil LB1.

  Similarly, when the second leakage magnetic field detection coil LA2 detects a leakage alternating magnetic field (leakage magnetic flux), the second leakage magnetic field extraction signal SN2 from the second leakage magnetic field signal extraction circuit 22 is output to the system control unit 40. Based on the second leakage magnetic field extraction signal SN2, the system control unit 40 has the same strength level as the leakage alternating magnetic field (leakage magnetic flux) detected by the second leakage magnetic field detection coil LA2 and has a phase shifted by 180 degrees. The high frequency current for reducing the leakage magnetic field of the frequency is calculated. Then, the system control unit 40 generates the calculated leakage magnetic field reducing high-frequency current in the second leakage magnetic field reduction circuit 32 and energizes the second leakage magnetic field reduction coil LB2 with the leakage magnetic field reduction high-frequency current. Let

  As a result, an alternating magnetic field having the same strength level as that of the leakage alternating magnetic field (leakage magnetic flux) detected by the second leakage magnetic field detection coil LA1 from the second leakage magnetic field reduction coil LB2 and having a phase shifted by 180 degrees is radiated. Is done. As a result, the leakage alternating magnetic field (leakage magnetic flux) detected by the second leakage magnetic field detection coil LA2 is canceled or reduced or eliminated by the alternating magnetic field radiated from the first leakage magnetic field reduction coil LB2.

  As described above, the alternating magnetic field radiated from the first leakage magnetic field reduction coil LB1 is generated based on the leakage alternating magnetic field detected by the adjacent first leakage magnetic field detection coil LA1. On the other hand, the alternating magnetic field radiated from the second leakage magnetic field reduction coil LB2 was generated based on the leakage alternating magnetic field (leakage magnetic flux) detected by the adjacent second leakage magnetic field detection coil LA2.

  Moreover, since the leakage alternating magnetic field at the nearest position is detected and an alternating magnetic field that cancels out the leakage alternating magnetic field is radiated at the adjacent position, a leakage alternating that is partially radiated from the feeding area AR during feeding and is emitted to the outside A magnetic field (leakage magnetic flux) can be reduced reliably.

More specifically, both the leakage alternating magnetic field detected by the first leakage magnetic field detection coil LA1 and the leakage alternating magnetic field detected by the second leakage magnetic field detection coil LA2 have the same power feeding frequency. In contrast, the intensity level, the distance to the feeding area AR in the feed, and, different from each other by placement state of the device E.

  Therefore, the leakage alternating magnetic fields radiated from the first leakage magnetic field reduction coil LB1 and the second leakage magnetic field reduction coil LB2 are both alternating magnetic fields having the same power feeding frequency and shifted in phase by 180 degrees. However, the alternating magnetic fields radiated from the first leakage magnetic field reduction coil LB1 and the second leakage magnetic field reduction coil LB2 have different strength levels. Therefore, the strength (magnitude) of the alternating magnetic field radiated from the first leakage magnetic field reduction coil LB1 and the second leakage magnetic field reduction coil LB2 is the leakage detected by the first leakage magnetic field detection coil LA1 and the second leakage magnetic field detection coil LA2. It is made to correspond with the intensity of an alternating magnetic field, respectively. From this, the leakage alternating magnetic field (leakage magnetic flux) that is partly leaked from the power supply area AR at each position and radiated to the outside can be accurately and reliably reduced.

Next, effects of the embodiment configured as described above will be described below.
(1) According to the above embodiment, the leakage alternating magnetic field partially leaking from the power feeding area AR during power feeding and radiated to the outside is detected by the first and second leakage magnetic field detection coils LA1 and LA2. Based on the detection results detected by the first and second leakage magnetic field detection coils LA1 and LA2, an alternating magnetic field that cancels the leakage alternating magnetic field is radiated from the first and second leakage magnetic field reduction coils LB1 and LB2. . Therefore, it is possible to reliably reduce the leakage alternating magnetic field that is partly leaked from the power feeding area AR during power feeding and is radiated to the outside.

  Further, for example, when the leakage alternating magnetic field detected by the first leakage magnetic field detection coil LA1 by the first leakage magnetic field reduction coil LB1 cannot be sufficiently canceled and reduced, the leakage magnetic field that cannot be canceled is reduced to the second leakage magnetic field detection coil. LA2 can be detected. Therefore, the leakage magnetic field that cannot be canceled out by the alternating magnetic field radiated from the second leakage magnetic field reduction coil LB2 can be canceled, and the leakage magnetic field can be reduced with high accuracy.

  (2) According to the above embodiment, the first leakage magnetic field detection coil LA1 and the first leakage magnetic field reduction coil LB1 are provided in one of the plurality of primary coils L1 arranged in parallel, and the second leakage magnetic field detection coil LA2 and the second Two leakage magnetic field reduction coils LB2 were provided. Then, the first leakage magnetic field detection coil LA1 and the first leakage magnetic field reduction coil LB1, and the other second leakage magnetic field detection coil LA2 and the second leakage magnetic field reduction coil LB2 detect the leakage alternating magnetic field independently of each other. And an alternating magnetic field that cancels out is emitted. Therefore, the leakage alternating magnetic field radiated to the outside during power feeding can be accurately and reliably reduced.

  (3) According to the above embodiment, the energization control of the primary coil L1 during power feeding is not influenced by the reduction control of the leakage alternating magnetic field, but is independently drive-controlled. As a result, the leakage alternating magnetic field can be reduced without reducing the power supply capability.

(Second Embodiment)
Next, 2nd Embodiment of an electric power feeder is described according to drawing.
The present embodiment is characterized in that a dedicated leakage magnetic field detection coil and leakage magnetic field reduction coil are not provided in the power supply apparatus. That is, the present embodiment is characterized in that the primary coil L1 is substituted for the first and second leakage magnetic field detection coils LA1, LA2 and the first and second leakage magnetic field reduction coils LB1, LB2.

  Therefore, in this embodiment, for convenience of explanation, the characteristic part is described in detail, and the detailed description of the common part is omitted. The power feeding device 1 according to the present embodiment is the same as the power feeding device 1 according to the first embodiment shown in FIG. 2 except that the first and second leakage magnetic field detection coils LA1, LA2 provided on both sides of the six primary coils L1, In addition, the first and second leakage magnetic field reduction coils LB1 and LB2 are omitted.

  FIG. 6 shows an electrical block circuit showing the electrical configuration of the power feeding apparatus 1. As shown in FIG. 6, each power supply unit circuit 10 is provided with a leakage magnetic field signal extraction circuit 16 and a leakage magnetic field reduction circuit 17.

  The leakage magnetic field signal extraction circuit 16 is a circuit having the same circuit configuration as the first and second leakage magnetic field signal extraction circuits 21 and 22 described in the first embodiment. The leakage magnetic field reduction circuit 17 is a circuit having the same circuit configuration as the first and second leakage magnetic field reduction circuits 31 and 32 described in the first embodiment.

  A first selection switch circuit 18 is connected to one first external terminal P1 of the primary coil L1. The second selection switch circuit 19 is connected to the other second external terminal P2 of the primary coil L1. The primary coil L1 is connected to any one of the inverter circuit 12, the leakage magnetic field signal extraction circuit 16, and the leakage magnetic field reduction circuit 17 provided in the power supply unit circuit 10 by the first and second selection switch circuits 18 and 19. It has become.

(First selection switch circuit 18)
As shown in FIG. 7, the first selection switch circuit 18 includes three first to third bidirectional switches Q11 to Q13. In the present embodiment, the first to third bidirectional switches Q11 to Q13 are each composed of a GaN (gallium nitride) bidirectional switch device having a double gate.

  When the ON signal switching signal SL is input to the two gate terminals, the first bidirectional switch Q11 passes through the first external terminal P1 of the primary coil L1, the current detection circuit 13, and the primary side resonance capacitor C1. Thus, conduction between the connection point N1 of the inverter circuit 12 is enabled. On the contrary, the first bidirectional switch Q11 has the first external terminal P1 of the primary coil L1, the current detection circuit 13, and the primary side resonance capacitor when the OFF signal switching signal SL is input to the two gate terminals. The conduction between the inverter circuit 12 and the connection point N1 is cut off via C1.

  Further, the second bidirectional switch Q12 has a first external terminal P1 of the primary coil L1 and a first one of the leakage magnetic field signal extraction circuit 16 when the ON signal switching signal SL is input to the two gate terminals. Conduction with the input terminal P3 is enabled. On the contrary, the second bidirectional switch Q12 has one of the first external terminal P1 of the primary coil L1 and one of the leakage magnetic field signal extraction circuits 16 when the off signal switching signal SL is input to the two gate terminals. The conduction with the 1 input terminal P3 is cut off.

  Further, the third bidirectional switch Q13 has a first output of the first external terminal P1 of the primary coil L1 and one of the leakage field reduction circuit 17 when the ON signal switching signal SL is input to the two gate terminals. Conduction between the terminal P5 is enabled. On the other hand, the third bidirectional switch Q13 has a first external terminal P1 of the primary coil L1 and a first one of the leakage magnetic field reduction circuit 17 when the OFF signal switching signal SL is input to the two gate terminals. The conduction with the output terminal P5 is interrupted.

(Second selection switch circuit 19)
As shown in FIG. 7, the second selection switch circuit 19 includes three first to third bidirectional switches Q21 to Q23, similarly to the first selection switch circuit 18. Similarly, the first to third bidirectional switches Q21 to Q23 are each composed of a GaN (gallium nitride) bidirectional switch device having a double gate.

  The first bidirectional switch Q21 conducts between the second external terminal P2 of the primary coil L1 and the connection point N2 of the inverter circuit 12 when the ON signal switching signal SL is input to the two gate terminals. to enable. On the other hand, the first bidirectional switch Q21 is connected between the second external terminal P2 of the primary coil L1 and the connection point N2 of the inverter circuit 12 when the off signal switching signal SL is input to the two gate terminals. Shut off the continuity.

  The second bidirectional switch Q22 has a second external terminal P2 of the primary coil L1 and the other second of the leakage magnetic field signal extraction circuit 16 when the ON signal switching signal SL is input to the two gate terminals. Conduction between the input terminal P4 is enabled. On the other hand, the second bidirectional switch Q22 has the second external terminal P2 of the primary coil L1 and the other second one of the leakage magnetic field signal extraction circuit 16 when the OFF signal switching signal SL is input to the two gate terminals. The conduction between the two input terminals P4 is cut off.

  Further, the third bidirectional switch Q23 has a second external terminal P2 of the primary coil L1 and the other second output of the leakage magnetic field reduction circuit 17 when the ON signal switching signal SL is input to the two gate terminals. Conduction between the terminal P6 is enabled. On the contrary, the third bidirectional switch Q23 has the second external terminal P2 of the primary coil L1 and the other second of the leakage magnetic field reduction circuit 17 when the off signal switching signal SL is input to the two gate terminals. The conduction with the output terminal P6 is cut off.

  The gate terminals of the first to third bidirectional switches Q11 to Q13 and Q21 to Q23 of the first and second selection switch circuits 18 and 19 are connected to the system control unit 40. The first bidirectional switches Q11 and Q21 both receive the same switching signal SL from the system control unit 40. Similarly, the second bidirectional switches Q12 and Q22 both receive the same switching signal SL from the system control unit 40. Similarly, the third bidirectional switches Q13 and Q23 both receive the same switching signal SL from the system control unit 40.

  More specifically, when the first bidirectional switches Q11 and Q21 are both controlled to be in a conductive state, the second bidirectional switches Q12 and Q22 and the third bidirectional switches Q13 and Q23 are controlled to be in a cutoff state. That is, the primary coil L1 is connected to the inverter circuit 12.

  Further, when the second bidirectional switches Q12 and Q22 are both controlled to be in a conductive state, the first bidirectional switches Q11 and Q21 and the third bidirectional switches Q13 and Q23 are controlled to be in a cutoff state. That is, the primary coil L1 is connected to the leakage magnetic field signal extraction circuit 16.

  Further, when the third bidirectional switches Q13 and Q23 are both controlled to be in a conductive state, the first bidirectional switches Q11 and Q21 and the second bidirectional switches Q12 and Q22 are controlled to be in a cutoff state. That is, the primary coil L1 is connected to the leakage magnetic field reduction circuit 17.

  The system control unit 40 outputs a switching signal to the first and second selection switch circuits 18 and 19 when the high-frequency current of the device detection frequency or the power supply frequency is supplied to the primary coil L1 to output the first bidirectional switch. Q11 and Q21 are turned on.

  Here, when the system control unit 40 energizes the primary coil L1 with a high-frequency current having a device detection frequency, has the device E been placed in the power supply area AR based on the determination signal SJ from the device detection circuit 14? Judge whether. When the system control unit 40 determines that the device E is placed in the power feeding area AR, the system control unit 40 causes the primary coil L1 to be energized with a high-frequency current having a power feeding frequency, and the secondary coil of the device E Contactless power supply is performed to L2.

  Further, when the system control unit 40 detects the leakage alternating magnetic field by the primary coil L1, the system control unit 40 outputs the switching signal SL to the first and second selection switch circuits 18 and 19, and sets the second bidirectional switches Q12 and Q22. Make it conductive. The system control unit 40 identifies the power supply unit circuit 10 in the power supply area AR that does not perform the power supply operation adjacent to the power supply unit circuit 10 that starts the power supply operation. The system control unit 40 brings the second bidirectional switches Q12 and Q22 of the first and second selection switch circuits 18 and 19 provided in the specified power supply unit circuit 10 into a conductive state, and the primary coil L1 and the leakage magnetic field signal extraction circuit. 16 is connected.

  Accordingly, the primary coil L1 is used as a leakage magnetic field detection coil for detecting a leakage alternating magnetic field, and a leakage detection signal SG is output to the leakage magnetic field signal extraction circuit 16, and the leakage magnetic field signal extraction circuit of the power supply unit circuit 10 is used. At 16, the leakage flux detection operation is performed.

  Then, the system control unit 40 inputs the leakage magnetic field extraction signal SN from the leakage magnetic field signal extraction circuit 16 of the power supply unit circuit 10. The system control unit 40 supplies power with the same strength level as the leakage alternating magnetic field (leakage magnetic flux) detected by the primary coil L1 used as the magnetic flux detection coil based on the leakage magnetic field extraction signal SN and with a phase shifted by 180 degrees. The high frequency current for reducing the leakage magnetic field of the operating frequency is calculated.

  Further, when the system control unit 40 radiates an alternating magnetic field for reducing the leakage magnetic field from the primary coil L1, the system control unit 40 outputs a switching signal SL to the first and second selection switch circuits 18 and 19 to output the third bidirectional switch Q13. , Q23 is turned on.

  The system control unit 40 specifies the power supply unit circuit 10 in the power supply area AR that does not perform the power supply operation and the leakage magnetic flux detection operation adjacent to the primary coil L1 used as the leakage magnetic field detection coil. The system control unit 40 brings the third bidirectional switches Q13 and Q23 of the first and second selection switch circuits 18 and 19 provided in the identified power supply unit circuit 10 into a conductive state, and the primary coil L1 and the leakage magnetic field reduction circuit 17. Connect. Accordingly, the primary coil L1 is used as a leakage magnetic field reduction coil that reduces a leakage alternating magnetic field.

  Then, the system control unit 40 leaks the control signal CTx for generating the high-frequency current for reducing the leakage magnetic field calculated based on the leakage magnetic field extraction signal SN from the leakage magnetic field signal extraction circuit 16 of the adjacent power supply unit circuit 10. Output to the magnetic field reduction circuit 17. The leakage magnetic field reduction circuit 17 generates a high frequency current for reducing the leakage magnetic field. The generated high-frequency current for reducing the leakage magnetic field is supplied to the primary coil L1 via the third bidirectional switches Q13 and Q23.

  As a result, an alternating magnetic field having the same power level as the leakage alternating magnetic field (leakage magnetic flux) detected by the adjacent primary coil L1 and a phase of 180 degrees in phase is radiated from the primary coil L1. The As a result, the leakage alternating magnetic field (leakage magnetic flux) detected by the primary coil L1 adjacent to the primary coil L1 being fed is the primary coil adjacent to the primary coil L1 detecting the leakage alternating magnetic field. It is canceled or reduced by the alternating magnetic field radiated from L1.

Next, the operation of the power feeding device 1 configured as described above will be described.
Now, when the power supply device 1 is turned on, the system control unit 40 performs device detection as to whether or not the device E is placed. At this time, the system control unit 40 brings the first bidirectional switches Q11 and Q21 of the first and second selection switch circuits 18 and 19 of each power supply unit circuit 10 into a conductive state. The system control unit 40 causes each of the power supply unit circuits 10 to energize the primary coil L1 in turn with a high-frequency current having a device detection frequency. And the system control part 40 waits for the determination signal SJ from the apparatus detection circuit 14 of each electric power feeding unit circuit 10 whether the apparatus E is mounted in each primary coil L1 in order.

  Here, for example, when it is determined that the device E (secondary coil L2) is placed on the fourth primary coil L1 (power feeding area AR), the system control unit 40 determines that the primary coil L1 is energized with a high-frequency current having a power feeding frequency. As a result, the fourth primary coil L1 is energized with a high-frequency current having a power feeding frequency, so that power feeding to the device E is started.

  At this time, the system control unit 40 specifies that the primary coil L1 adjacent to the fourth primary coil L1 that starts power feeding is the third and fifth primary coils L1. The system control unit 40 then includes the second bidirectional switches Q12 and Q22 of the first and second selection switch circuits 18 and 19 provided in the power supply unit circuit 10 of the identified third and fifth primary coils L1. Is turned on.

  As a result, the third and fifth primary coils L1 are connected to the respective leakage magnetic field signal extraction circuits 16 via the second bidirectional switches Q12 and Q22, respectively. And the 4th and 5th primary coil L1 is used as a leakage magnetic field detection coil which detects the leakage alternating magnetic field radiated | emitted from the 4th primary coil L1 which supplies electric power.

  Further, the system control unit 40 confirms that the primary coils L1 adjacent to the outside of the third and fifth primary coils L1 used as the leakage magnetic field detection coils are the second and sixth primary coils L1. Identify. Then, the system control unit 40 includes third bidirectional switches Q13 and Q23 of the first and second selection switch circuits 18 and 19 provided in the power supply unit circuit 10 of the identified second and sixth primary coils L1. Is turned on.

  As a result, the second and sixth primary coils L1 are connected to the respective leakage magnetic field reduction circuits 17 via the third bidirectional switches Q13 and Q23, respectively. The second and sixth primary coils L1 are used as leakage magnetic field reduction coils that reduce the leakage alternating magnetic field.

  When the fourth primary coil L1 is supplied with a high-frequency current having a feeding frequency and feeding is started, the third and fifth primary coils L1 are radiated from the fourth primary coil L1. Detect leakage alternating magnetic field. When the third and fifth primary coils L1 detect a leakage alternating magnetic field (leakage magnetic flux), each leakage magnetic field signal extraction circuit 16 outputs a leakage magnetic field extraction signal SN to the system control unit 40.

  Based on each leakage magnetic field extraction signal SN, the system control unit 40 has the same strength level as the leakage alternating magnetic field (leakage magnetic flux) detected by each primary coil L1 and leakage of the feeding frequency whose phase is shifted by 180 degrees. The high-frequency current for reducing the magnetic field is calculated. Then, the system control unit 40 causes the power supply unit circuit 10 of the second and sixth primary coils L1 to generate the calculated high-frequency current for reducing the leakage magnetic field based on the respective calculation results.

  As a result, the second primary coil L1 emits an alternating magnetic field having the same strength level as the leakage alternating magnetic field detected by the third primary coil L1 and having a phase shifted by 180 degrees. That is, the leakage alternating magnetic field (leakage magnetic flux) detected by the third primary coil L1 is canceled or reduced or eliminated by the alternating magnetic field radiated from the second primary coil L1.

  Further, an alternating magnetic field having the same strength level as that of the leakage alternating magnetic field detected by the fifth primary coil L1 and a phase shifted by 180 degrees is radiated from the sixth primary coil L1. That is, the leakage alternating magnetic field detected by the fifth primary coil L1 is canceled or reduced or eliminated by the alternating magnetic field radiated from the sixth primary coil L1.

Next, effects of the embodiment configured as described above will be described below.
(1) According to the above embodiment, a leakage alternating magnetic field that is partially leaked from the feeding area AR during feeding and is radiated to the outside is detected by the adjacent primary coil L1. And based on the detection result detected with the adjacent primary coil L1, the alternating magnetic field which cancels a leakage alternating magnetic field was radiated | emitted from the primary coil L1 adjacent to the primary coil L1 which detected the leakage magnetic flux. Therefore, it is possible to reliably reduce the leakage alternating magnetic field that is partly leaked from the power feeding area AR during power feeding and is radiated to the outside.

  Further, for example, when the leakage alternating magnetic field detected by the third primary coil L1 cannot be sufficiently canceled and reduced by the second primary coil L1, the leakage magnetic field that cannot be canceled is reduced to the fifth primary coil. L1 can be detected. Therefore, the leakage magnetic field that could not be canceled by the alternating magnetic field radiated from the sixth primary coil L1 can be canceled, and the leakage magnetic field can be reduced with high accuracy.

  (2) According to the above-described embodiment, the leakage alternating magnetic field, which is partially leaked from the power supply area AR during power supply and is radiated to the outside, is separately leaked in the primary coil L1 disposed on both sides. Is detected and an alternating magnetic field that cancels out is emitted. Therefore, the leakage alternating magnetic field radiated to the outside during power feeding can be accurately and reliably reduced.

  (3) According to the above embodiment, the energization control of the primary coil L1 during power feeding is not influenced by the reduction control of the leakage alternating magnetic field, but is independently drive-controlled. As a result, the leakage alternating magnetic field can be reduced without reducing the power supply capability.

  (4) According to the above embodiment, the primary coil L1 for power feeding can be used as a leakage magnetic field detection coil and a leakage magnetic field reduction coil. Therefore, a dedicated leakage magnetic field detection coil and a dedicated leakage magnetic field reduction coil are not provided, and the size can be reduced and the cost can be reduced accordingly.

In addition, you may change the said embodiment as follows.
In the above embodiment, the power feeding device 1 has the primary coils L1 arranged in parallel in the one-dimensional direction. This may be applied to a power feeding device in which a plurality of primary coils L1 are arranged in a two-dimensional direction. Incidentally, when the first embodiment is applied to a power supply device in which a plurality of primary coils L1 are arranged in a two-dimensional direction, a plurality of leakage magnetic field detection coils are arranged so as to surround the primary coil L1, and the leakage magnetic field detection is performed. A leakage magnetic field reduction coil is disposed outside the coil.

  Further, the primary coil L1 may be applied to one power supply device 1 for implementation. In this case, a plurality of leakage magnetic field detection coils and a plurality of leakage magnetic field reduction coils may be provided so as to surround the one primary coil L1. Of course, one leakage magnetic field detection coil and one leakage magnetic field reduction coil may be provided for one primary coil L1.

Moreover, although the leakage magnetic field detection coil and the leakage magnetic field reduction coil are disposed adjacent to each other, they may be separated from each other to the extent that the leakage magnetic field can be reduced.
In the first embodiment, the power supply device 1 in which the primary coil L1 is arranged in the one-dimensional direction has the leakage magnetic field detection coil and the leakage magnetic field reduction coil arranged in both, but this is not restrictive. For example, the leakage magnetic field detection coil and the leakage magnetic field reduction coil may be arranged only on one side, or three or more leakage magnetic field detection coils and leakage magnetic field reduction coils may be arranged on one or both. .

  The first and second leakage magnetic field signal extraction circuits 21 and 22 (similarly to the leakage magnetic field signal extraction circuit 16 of the second embodiment) provided in the first embodiment have a filter circuit. The filter circuit assumes that the frequency of the leakage alternating magnetic field is the frequency for power supply, acquires the signal waveform of the frequency component of the power supply frequency, and specifies the strength level of the leakage alternating magnetic field from the acquired signal waveform. .

  However, the present invention is not limited to this. The frequency of the leakage magnetic field is obtained in advance through tests, experiments, calculations, etc., and the signal waveform of the obtained frequency component is passed through the first and second leakage detection signals SG1 and SG2. It may be a band-pass filter circuit.

  The filter circuits in the first and second leakage magnetic field signal extraction circuits 21 and 22 (similarly to the leakage magnetic field signal extraction circuit 16 of the second embodiment) provided in the first embodiment are the first and second leakage currents. The frequency component of the power feeding frequency in the detection signal is passed. However, a plurality of filter circuits that pass frequency components such as a second harmonic, a third harmonic, and a fourth harmonic of the power feeding frequency may be provided. And you may implement the frequency of the largest intensity | strength among the signal waveforms of the frequency component obtained from these several filter circuits as a frequency for leakage magnetic field reduction.

  Further, the filter circuit in the first and second leakage magnetic field signal extraction circuits 21 and 22 (similarly to the leakage magnetic field signal extraction circuit 16 of the second embodiment) provided in the first embodiment is implemented as a variable filter circuit. May be. In this case, when the frequency of the leakage alternating magnetic field is not grasped, the leakage alternating magnetic field having the highest intensity level can be extracted.

  In the first embodiment, the first and second leakage magnetic field detection coils LA1 and LA2 are disposed closer to the primary coil L1 that is being fed, and the first and second leakage magnetic field reduction coils LB1 and LB2 are disposed outside the first and second leakage magnetic field detection coils LA1 and LB2. However, the present invention is not limited to this. For example, the first and second leakage magnetic field reduction coils LB1 and LB2 are disposed closer to the primary coil L1 that is being fed, and the first and second leakage magnetic field detection coils LA1 and LA2 are disposed outside the first and second leakage magnetic field detection coils LA1 and LA2. May be.

  Further, the leakage magnetic field detection coil and the leakage magnetic field reduction coil may be arranged at a position separated from the primary coil L1. In this case, the leakage magnetic field detection coil and the leakage magnetic field reduction coil may be separated from each other to such an extent that the effect of reducing the leakage magnetic field can be exhibited.

  Of course, the leakage magnetic field detection coil is disposed at a position separated from the primary coil L1, and the leakage magnetic field reduction coil is disposed at a position adjacent to the leakage magnetic field detection coil, or is disposed at a position adjacent to the primary coil L1. May be implemented. Conversely, the leakage magnetic field reduction coil is disposed at a position separated from the primary coil L1, and the leakage magnetic field detection coil is disposed at a position adjacent to the leakage magnetic field reduction coil or at a position adjacent to the primary coil L1. Or may be implemented.

  In the second embodiment, as an example, when the power feeding operation is performed by the fourth primary coil L1, the third and fifth primary coils L1 adjacent to the fourth primary coil L1 are connected to the leakage magnetic field. Used as a detection coil. This may be used by specifying the primary coil L1 slightly away from the primary coil L1 in which the power feeding operation is performed as the leakage magnetic field detection coil.

  Similarly, in the second embodiment, as an example, when the third and fifth primary coils L1 are used as leakage magnetic field detection coils, the adjacent second and sixth primary coils L1 are used as leakage magnetic field reduction coils. It was identified and used. This may be specified and used as the leakage magnetic field reduction coil, the primary coil L1 slightly separated from the primary coil L1 used as the leakage magnetic field detection coil.

  In the first embodiment (the same applies to the second embodiment), the first and second leakage magnetic field detection coils LA1 and LA2 are alternating magnetic fields for reducing the leakage magnetic field in the first and second leakage magnetic field reduction coils LB1 and LB2. The leakage alternating magnetic field for radiating the light was detected.

  The leakage magnetic field detection coil is installed at a position separated from the primary coil L1 by a predetermined distance. And in the fixed arrangement relationship between each primary coil L1 and the leakage magnetic field detection coil, the leakage magnetic field detection coil measures the absolute value of the intensity level of the leakage alternating magnetic field radiated from each primary coil L1. It may be used as a leakage magnetic field detection coil.

  That is, the leakage magnetic field detection coil at a predetermined distance detects the leakage alternating magnetic field radiated by each primary coil L1 with respect to each primary coil L1. Then, the leakage magnetic field leakage detection signal SG1 of the leakage alternating magnetic field radiated by each primary coil L1 detected by the leakage magnetic field detection coil is extracted by the leakage magnetic field signal extraction circuit. Then, in the determined arrangement relationship between each primary coil L1 and the leakage magnetic field detection coil, the absolute value of the intensity level of the leakage alternating magnetic field radiated from each primary coil L1 is obtained.

  As a result, at the stage of designing the power feeding device 1, by knowing the absolute value of the intensity level of the leakage alternating magnetic field radiated by each primary coil L1, the relative level of the leakage alternating magnetic field of each primary coil L1 can be determined. The size can be grasped, and the power supply device 1 can be easily designed.

  A leakage magnetic field detection coil for measuring the absolute value of the intensity level of the leakage alternating magnetic field radiated from each primary coil L1 may be provided on the device E side. In this case, the power feeding device 1 and the power receiving circuit 5 are provided with a communication circuit (communication means) that exchanges information with each other.

  And the apparatus E is arrange | positioned at fixed distance with respect to the electric power feeder 1 (mounting surface 3). In this state, the leakage magnetic field detection coil provided on the device E side detects the leakage alternating magnetic field from each primary coil L1 for each primary coil L1, and receives the leakage detection signal SG1 in the power receiving circuit 5 and the power feeding device. 1 is output to the leakage magnetic field signal extraction circuit via the communication circuit 1. Also in this case, the absolute value of the intensity level of the leakage alternating magnetic field radiated from each primary coil L1 can be obtained in the determined arrangement relationship between each primary coil L1 and the leakage magnetic field detection coil.

  In the second embodiment, the first to third bidirectional switches Q11 to Q13 and Q21 to Q23 of the first and second selection switch circuits 18 and 19 are GaN (gallium nitride) bidirectional switching having a double gate. Configured with devices. These bidirectional switches may be configured by connecting two series circuits of a diode and an insulated gate bipolar transistor (IGBT) in parallel with their polar directions changed from each other. These bidirectional switches may be configured by connecting an N-channel power MOS transistor and a P-channel power MOS transistor in series.

  In the above embodiment, the inverter circuit 12 is generated by the half-bridge circuit, but may be implemented by other high-frequency oscillation circuits such as a full-bridge circuit.

  DESCRIPTION OF SYMBOLS 1 ... Non-contact electric power feeder (power feeder), 2 ... Housing, 3 ... Mounting surface, 5 ... Power receiving circuit, 6 ... Rectifier circuit, 10 ... Power feeding unit circuit, 11 ... Drive circuit, 12 ... Inverter circuit, 13 ... Current detection circuit, 14 ... device detection circuit, 16 ... leakage magnetic field signal extraction circuit, 17 ... leakage magnetic field reduction circuit, 18, 19 ... first and second selection switch circuits, 21, 22 ... first and second leakage magnetic field signals Extraction circuit 31, 32 ... first and second leakage magnetic field reduction circuit, 40 ... system control unit (control means), AR ... feeding area, ARx1, ARx2 ... first and second leakage magnetic field detection areas, ARy1, ARy2 ... 1st and 2nd leakage magnetic field reduction area, E ... Electric device (equipment), Z ... Load, L1 ... Primary coil, L2 ... Secondary coil, LA1, LA2 ... First and second leakage magnetic field detection coils, LB1, LB2 ... first and Two leakage magnetic field reduction coils, C1, C2 ... primary and secondary resonance capacitors, Ca, Cb ... first and second capacitors, Qa, Qb ... first and second power transistors, N1, N2 ... connection point, Q11 ˜Q13... First to third bidirectional switches, Q21 to Q23... First to third bidirectional switches, P1, P2... First and second external terminals, P3 and P4. , P6, first and second output terminals, CT, CTx, control signal, CT1, CT2, first and second control signals, PSa, PSb, drive signal, SJ, determination signal, SG, leak detection signal, SG1, SG2 ... first and second leakage detection signals, SN ... leakage magnetic field extraction signal, SN1, SN2 ... first and second leakage magnetic field extraction signals, SL ... switching signal.

Claims (10)

When an electrical device is arranged in a primary coil that radiates an alternating magnetic field for power supply when a high-frequency current for power supply is applied, the primary coil radiates the alternating magnetic field and is provided in the electrical device by electromagnetic induction A non-contact power feeding device configured to generate secondary power in the secondary coil of the power receiving device,
One or more leakage magnetic field detection coils that detect a leakage alternating magnetic field in which a part of the alternating magnetic field for power supply leaks to the outside and output as a leakage detection signal;
One or more leakage magnetic field reduction coils that generate an alternating magnetic field for reducing a leakage magnetic field that reduces the leakage alternating magnetic field;
Based on the leakage detection signal, the leakage magnetic field reduction high-frequency current for generating the leakage magnetic field reduction magnetic field for canceling and reducing the leakage alternating magnetic field is calculated, and the calculated leakage magnetic field reduction high-frequency current is calculated. Control means for energizing the one or more leakage magnetic field reduction coils with an electric current and radiating an alternating magnetic field for leakage magnetic field reduction from the one or more leakage magnetic field reduction coils ,
The control means includes
A leakage magnetic field signal extraction circuit that inputs a leakage detection signal from the leakage magnetic field detection coil, extracts a frequency and intensity level of the leakage alternating magnetic field from the leakage detection signal, and outputs the leakage magnetic field extraction signal as a leakage magnetic field extraction signal;
A leakage magnetic field reduction circuit for generating a high-frequency current for reducing the leakage magnetic field to be passed through the leakage magnetic field reduction coil;
Based on a leakage magnetic field extraction signal of the leakage magnetic field signal extraction circuit, a leakage magnetic field that radiates an alternating magnetic field for reducing a leakage magnetic field having a frequency that is the same level as the leakage alternating magnetic field and that is 180 degrees out of phase. A control unit for outputting a control signal for generating a high-frequency current for reduction to the leakage magnetic field reduction circuit;
Have
The leakage magnetic field signal extraction circuit includes a filter circuit that acquires a plurality of predetermined leakage alternating magnetic field frequency components from the leakage detection signal, and each of the leakage alternating magnetic field of the frequency component acquired by the plurality of filtering circuits. A non-contact power feeding apparatus characterized in that a leakage alternating magnetic field having the largest intensity level is extracted .   When an electrical device is arranged in a primary coil that radiates an alternating magnetic field for power supply when a high-frequency current for power supply is applied, the primary coil radiates the alternating magnetic field and is provided in the electrical device by electromagnetic induction A non-contact power feeding device configured to generate secondary power in the secondary coil of the power receiving device,
  One or more leakage magnetic field detection coils that detect a leakage alternating magnetic field in which a part of the alternating magnetic field for power supply leaks to the outside and output as a leakage detection signal;
  One or more leakage magnetic field reduction coils that generate an alternating magnetic field for reducing a leakage magnetic field that reduces the leakage alternating magnetic field;
  Based on the leakage detection signal, the leakage magnetic field reduction high-frequency current for generating the leakage magnetic field reduction magnetic field for canceling and reducing the leakage alternating magnetic field is calculated, and the calculated leakage magnetic field reduction high-frequency current is calculated. Control means for energizing the one or more leakage magnetic field reduction coils with current and radiating an alternating magnetic field for leakage magnetic field reduction from the one or more leakage magnetic field reduction coils;
Have
  The control means includes
  A leakage magnetic field signal extraction circuit that inputs a leakage detection signal from the leakage magnetic field detection coil, extracts a frequency and intensity level of the leakage alternating magnetic field from the leakage detection signal, and outputs the leakage magnetic field extraction signal as a leakage magnetic field extraction signal;
  A leakage magnetic field reduction circuit for generating a high-frequency current for reducing the leakage magnetic field to be passed through the leakage magnetic field reduction coil;
  Based on a leakage magnetic field extraction signal of the leakage magnetic field signal extraction circuit, a leakage magnetic field that radiates an alternating magnetic field for reducing a leakage magnetic field having a frequency that is the same level as the leakage alternating magnetic field and that is 180 degrees out of phase. A control unit for outputting a control signal for generating a high-frequency current for reduction to the leakage magnetic field reduction circuit;
Have
  The non-contact power feeding apparatus according to claim 1, wherein the leakage magnetic field signal extraction circuit has a variable filter circuit, and the variable filter circuit extracts a frequency component of a leakage alternating magnetic field having the largest intensity level. When an electrical device is arranged in a primary coil that radiates an alternating magnetic field for power supply when a high-frequency current for power supply is applied, the primary coil radiates the alternating magnetic field and is provided in the electrical device by electromagnetic induction A non-contact power feeding device configured to generate secondary power in the secondary coil of the power receiving device,
One or more leakage magnetic field detection coils that detect a leakage alternating magnetic field in which a part of the alternating magnetic field for power supply leaks to the outside and output as a leakage detection signal;
One or more leakage magnetic field reduction coils that generate an alternating magnetic field for reducing a leakage magnetic field that reduces the leakage alternating magnetic field;
Based on the leakage detection signal, the leakage magnetic field reduction high-frequency current for generating the leakage magnetic field reduction magnetic field for canceling and reducing the leakage alternating magnetic field is calculated, and the calculated leakage magnetic field reduction high-frequency current is calculated. Control means for energizing the one or more leakage magnetic field reduction coils with current and radiating an alternating magnetic field for leakage magnetic field reduction from the one or more leakage magnetic field reduction coils;
Have
A plurality of the primary coils are provided in a one-dimensional direction or a two-dimensional direction,
The leakage magnetic field detection coil is a primary coil that is not energized with the high-frequency current for feeding among the plurality of primary coils,
The leakage magnetic field reduction coil is a primary coil that is not energized with the high-frequency current for feeding among the plurality of primary coils, and that is not used as the leakage magnetic field detection coil. Yes,
The control means obtains the leakage detection signal for the primary coil used as the leakage magnetic field detection coil, calculates a high-frequency current for reducing the leakage magnetic field, and is used as the leakage magnetic field reduction coil. A non-contact power feeding apparatus, wherein the primary coil is energized with the calculated high-frequency current for reducing a leakage magnetic field. In the non-contact electric power feeder of Claim 3,
The leakage magnetic field detection coil is a primary coil adjacent to a primary coil through which a high-frequency current for power feeding is applied,
The non-contact power feeding device, wherein the leakage magnetic field reduction coil is a primary coil adjacent to a primary coil used as the leakage magnetic field detection coil. In the non-contact electric power feeder of Claim 3 or 4,
The control means includes
A leakage magnetic field signal extraction circuit that inputs a leakage detection signal from the leakage magnetic field detection coil, extracts a frequency and intensity level of the leakage alternating magnetic field from the leakage detection signal, and outputs the leakage magnetic field extraction signal as a leakage magnetic field extraction signal;
A leakage magnetic field reduction circuit for generating a high-frequency current for reducing the leakage magnetic field to be passed through the leakage magnetic field reduction coil;
Based on a leakage magnetic field extraction signal of the leakage magnetic field signal extraction circuit, a leakage magnetic field that radiates an alternating magnetic field for reducing a leakage magnetic field having a frequency that is the same level as the leakage alternating magnetic field and that is 180 degrees out of phase. A non-contact power feeding apparatus comprising: a control unit that outputs a control signal for generating a high-frequency current for reduction to the leakage magnetic field reduction circuit. In the non-contact electric power feeder of Claim 5,
The leakage magnetic field signal extraction circuit has a filter circuit that acquires a predetermined frequency component of the leakage alternating magnetic field from the leakage detection signal, and the intensity level of the leakage alternating magnetic field of the frequency component acquired by the filter circuit A non-contact power feeding device characterized in that the non-contact power feeding device is extracted.   In the non-contact electric power feeder of any one of Claims 1-6,
  A plurality of the primary coils are provided in a one-dimensional direction or a two-dimensional direction,
  The leakage magnetic field detection coil detects a leakage alternating magnetic field of an alternating magnetic field radiated from a plurality of primary coils provided in the one-dimensional direction or two-dimensional direction,
  The leakage magnetic field reducing coil generates an alternating magnetic field for reducing a leakage magnetic field that reduces a leakage alternating magnetic field of the alternating magnetic field radiated from a plurality of primary coils provided in the one-dimensional direction or the two-dimensional direction,
  The control means calculates a high-frequency current for reducing the leakage magnetic field to the leakage magnetic field reduction coil based on a leakage detection signal from each leakage magnetic field detection coil, and calculates the calculated high-frequency for reducing the leakage magnetic field. A non-contact power feeding device that is energized with an electric current. When an electrical device is arranged in a primary coil that radiates an alternating magnetic field for power supply when a high-frequency current for power supply is applied, the primary coil radiates the alternating magnetic field and is provided in the electrical device by electromagnetic induction A method for measuring a leakage alternating magnetic field of a non-contact power feeding device configured to generate secondary power in a secondary coil of a power receiving device,
One or more leakage magnetic field detection coils that detect a leakage alternating magnetic field in which a part of the alternating magnetic field for power supply leaks to the outside and output as a leakage detection signal are provided at a position separated from the primary coil by a predetermined distance. ,
The leakage detection signal is output to a leakage magnetic field signal extraction circuit, and the leakage magnetic field signal extraction circuit extracts the leakage alternating magnetic field strength level from the leakage detection signal ,
The leakage magnetic field signal extraction circuit includes a filter circuit that acquires a plurality of predetermined leakage alternating magnetic field frequency components from the leakage detection signal, and each of the leakage alternating magnetic field of the frequency component acquired by the plurality of filtering circuits. A leakage magnetic field measurement method for a non-contact power feeding device, wherein a leakage alternating magnetic field having the highest strength level is extracted .   When an electrical device is arranged in a primary coil that radiates an alternating magnetic field for power supply when a high-frequency current for power supply is applied, the primary coil radiates the alternating magnetic field and is provided in the electrical device by electromagnetic induction A method for measuring a leakage alternating magnetic field of a non-contact power feeding device configured to generate secondary power in a secondary coil of a power receiving device,
  One or more leakage magnetic field detection coils that detect a leakage alternating magnetic field in which a part of the alternating magnetic field for power supply leaks to the outside and output as a leakage detection signal are provided at a position separated from the primary coil by a predetermined distance. ,
  The leakage detection signal is output to a leakage magnetic field signal extraction circuit, and the leakage magnetic field signal extraction circuit extracts the leakage alternating magnetic field strength level from the leakage detection signal,
  The leakage magnetic field signal extraction circuit includes a variable filter circuit, and extracts a frequency component of a leakage alternating magnetic field having the highest intensity level by the variable filter circuit. Measuring method. In the leakage magnetic field measuring method of the non-contact electric power feeder according to claim 8 or 9,
The one or more leakage magnetic field detection coils are provided on the non-contact power supply device side or the power reception device side, and when provided on the power reception device side, the power reception device via communication means provided in the non-contact power supply device and the power reception device. A leakage magnetic field measuring method for a non-contact power feeding device, wherein a leakage detection signal of a leakage magnetic field detection coil provided on the side is output to a magnetic field signal extraction circuit provided on the non-contact power feeding device side.