JP2015177581A - Non-contact power feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power supply device that can be miniaturized and can efficiently supply power to plural power reception devices at the same time even when the resonance systems of the power reception devices are different from one another.SOLUTION: First to fourth power supply oscillation circuit parts 21 to 24 are provided which generate high-frequency current of first to fourth power supply frequencies fp1 to fp4 for each arrangement aspect of equipment E. The first to fourth power supply oscillation circuit parts 21 to 24 are shared to respective primary coils L1 in a selection circuit part 26. A system controller 27 selects the first to fourth power supply oscillation circuit parts 21 to 24 in conformity with the arrangement aspect of the equipment E, and the primary coils L1 are excited and driven by the high frequency current of the first to fourth power supply frequencies fp1 to fp4 which are conformed with the resonance frequency at the equipment E side in the arrangement aspect at that time. In addition, each primary coil L1 can be also excited and driven by the high frequency current of the same or different power supply frequency as or from other primary coils L1.

Description

  The present invention relates to a non-contact power feeding device.

  In the non-contact power feeding device using the electromagnetic induction method of Patent Document 1, an electric device is mounted on a mounting surface in which a plurality of primary coils are arranged in an array. Then, the primary coil is excited, and the secondary coil provided in the power receiving device of the electric device is excited and fed by electromagnetic induction. At this time, the secondary power generated in the secondary coil is converted into a DC power source in the power receiving apparatus, and the DC power source is supplied as a driving power source for the load of the electric equipment.

  Patent Document 2 proposes a non-contact power feeding device that selects and excites and drives a primary coil at a location where an electrical device is placed among a plurality of primary coils arranged in an array.

Special table 2009-525715 Special table 2012-523814

  By the way, in the non-contact electric power feeder of patent document 1, the drive circuit (oscillation circuit) for carrying out the excitation drive of this primary coil is provided for every some primary coil arrange | positioned at array form. For this reason, since one drive circuit is provided for one primary coil, the circuit scale increases and the entire apparatus increases. In particular, as the number of primary coils increases, the size of the device further increases, resulting in a problem of increased costs.

Therefore, as in Patent Document 2, by sharing a plurality of primary coils in one oscillation circuit (half-bridge driver), the circuit scale can be reduced and the entire apparatus can be downsized.
However, in Patent Document 2, since there is one type of power supply frequency output from one oscillation circuit, high-efficiency power supply cannot be performed when electrical devices having different resonance systems are placed at different locations at the same time.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to reduce the size of the apparatus and to efficiently supply power simultaneously even if the resonance systems of a plurality of power receiving apparatuses are different. The object is to provide a non-contact power feeding device.

  In the non-contact power supply apparatus for solving the above-described problem, a plurality of primary coils that generate an alternating magnetic field when energized with a high-frequency current are arranged in a one-dimensional direction or a two-dimensional direction, and at least one of the primary coils is provided. When the power receiving device is arranged oppositely, the primary coil alone or in cooperation with the other primary coil generates the alternating magnetic field, and secondary power is generated in the secondary coil of the power receiving device by electromagnetic induction. A plurality of high-frequency oscillation means for feeding less than the number of primary coils that respectively generate the high-frequency currents having different frequencies, and for each of the plurality of primary coils, Selecting means for selecting one of the plurality of high-frequency oscillation means for feeding and supplying a high-frequency current of the selected frequency; and a secondary coil of the power receiving device disposed to face at least one of the primary coils One of the high-frequency currents of the plurality of high-frequency oscillation means for feeding is determined based on an arrangement mode specifying unit for specifying the arrangement mode and an arrangement mode of the secondary coil of the power receiving device specified by the arrangement mode specifying unit. And control means for selectively controlling the selection means to supply each primary coil.

  Further, in the above configuration, the selection unit includes a selection switch circuit for each primary coil, and the selection switch circuit selects any one of the plurality of power supply high-frequency oscillation units and selects the selected one It is preferable to pass a high-frequency current at a power supply frequency of the power supply high-frequency oscillation means to the primary coil.

  Further, in the above configuration, the arrangement mode specifying unit includes a presence detection unit that detects the presence or absence of a power receiving device for each primary coil, and based on the detection result of each of the presence detecting units, It is preferable to specify the arrangement mode of the next coil.

  Further, in the above configuration, the presence detection means includes presence detection oscillation means for generating a high frequency current having a presence detection frequency, and the primary coil is energized by passing the high frequency current having the presence detection frequency to the primary coil. It is preferable to detect the presence or absence of the power receiving device based on a current flowing through the coil.

  In the non-contact power supply apparatus for solving the above-described problem, a plurality of primary coils that generate an alternating magnetic field when energized with a high-frequency current are arranged in a one-dimensional direction or a two-dimensional direction, and at least one of the primary coils When the power receiving device is arranged oppositely, the primary coil alone or in cooperation with the other primary coil generates the alternating magnetic field, and secondary power is generated in the secondary coil of the power receiving device by electromagnetic induction. And a variable resonance circuit that is provided for each of the plurality of primary coils and forms a primary circuit on the power feeding device side together with the primary coils, and each primary coil. Based on the arrangement mode specifying means for specifying the arrangement mode of the secondary coil of the power receiving device arranged opposite to at least one of the above, and the arrangement mode of the secondary coil of the power receiving device specified by the arrangement mode specifying means, The variable resonance circuit Characterized in that a control means for changing the resonance parameters.

  Further, in the above configuration, the variable resonance circuit includes capacitors having different capacities connected in series with the open / close switches, and the series circuits connected in parallel, wherein the open / close switches are connected to the control means. It is preferable that the capacity of the resonance parameter is changed by opening / closing control.

  Further, in the above configuration, the arrangement mode specifying unit includes a presence detection unit that detects the presence or absence of a power receiving device for each primary coil, and based on the detection result of each of the presence detecting units, It is preferable to specify the arrangement mode of the next coil.

  Further, in the above configuration, the presence detection means includes presence detection oscillation means for generating a high frequency current having a presence detection frequency, and the primary coil is energized by passing the high frequency current having the presence detection frequency to the primary coil. It is preferable to detect the presence or absence of the power receiving device based on a current flowing through the coil.

  According to the present invention, it is possible to reduce the size of the device and to efficiently supply power even when the resonance systems of the plurality of power receiving devices are different.

1 is an overall perspective view showing a non-contact power feeding device and an electric device according to a first embodiment. Similarly, explanatory drawing which shows the arrangement | sequence state of the primary coil provided in the electric power feeding area. Similarly, (a) is a diagram showing an arrangement mode in which the secondary coil L2 is directly opposed to one primary coil L1, and (b) is an arrangement in which the secondary coil L2 straddles the two primary coils L1. The figure which shows an aspect, (c) is a figure which shows the arrangement | positioning aspect in which the secondary coil L2 straddles the three primary coils L1, (d) is the arrangement in which the secondary coil L2 straddles the four primary coils L1 The figure which shows an aspect. Similarly, the electrical block circuit diagram of a non-contact electric power feeder and an electric equipment. Similarly, the electric block circuit diagram of the receiving device of an electric equipment. Similarly, the electrical block circuit diagram for demonstrating a selection circuit part. Similarly, the electrical circuit diagram of the selection switch circuit of the selection circuit unit. The electric block circuit diagram which shows the primary coil and resonance capacitor circuit by the side of the electric power feeder of 2nd Embodiment. Similarly, the electrical circuit diagram of a resonant capacitor circuit.

(First embodiment)
A first embodiment of a non-contact power feeding device embodying the present invention will be described below 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 supply apparatus 1 includes a rectangular plate-shaped housing 2, and has a mounting surface 3 on which the upper surface is flat and on which a plurality of devices E can be mounted simultaneously. The mounting surface 3 is divided into a plurality of rectangular power supply areas AR. In the present embodiment, 24 are arranged in a row in the left-right direction (horizontal direction) and 6 in the front-rear direction (vertical direction). A power feeding area AR is defined.

  As shown in FIG. 2, a primary coil L <b> 1 wound in a rectangular shape in accordance with the outer shape of the power supply area AR is provided in the housing 2 at a position corresponding to each partitioned power supply area AR. Has been placed. Each primary coil L1 is energized and driven by a high-frequency current having a power feeding frequency to emit an alternating magnetic field.

  Each primary coil L1 is driven by excitation alone or in cooperation with another primary coil L1, and is wound into a square shape provided in a device E placed on the placement surface 3 2 Non-contact power feeding is performed to the next coil L2. That is, when the device E is placed on the placement surface 3 of the housing 2, the secondary coil L2 provided in the device E is induced by an electromagnetic field induced by the alternating magnetic field radiated from the primary coil L1. (Secondary power) is generated.

  Here, each primary coil L1 is selected and supplied with four types of first to fourth power feeding frequencies fp1 to fp4, and the first to fourth power feedings corresponding thereto. An alternating magnetic field having a frequency of fp1 to fp4 is radiated.

  Incidentally, as shown in FIG. 3A, the first power supply frequency fp1 excites one primary coil L1 when the secondary coil L2 is directly opposed to one primary coil L1. This is the frequency for feeding the high-frequency current.

  As shown in FIG. 3B, the second power supply frequency fp2 is a high-frequency current supply that excites the two primary coils L1 when the secondary coil L2 straddles the two primary coils L1. This is the frequency used.

  As shown in FIG. 3C, the third power supply frequency fp3 is a high-frequency current supply that excites the three primary coils L1 when the secondary coil L2 straddles the three primary coils L1. Refers to the frequency.

  As shown in FIG. 3D, the fourth feeding frequency fp4 is a feeding frequency of a high-frequency current that excites the four primary coils L1 when the secondary coil L2 straddles the four primary coils L1. Say.

  More specifically, in order to receive the secondary power fed from the primary coil L1 with low loss, the device E (secondary coil L2) has a high resonance frequency determined by the inductor component and the capacitor component on the device E side. It is necessary to drive the primary coil L1 with current.

  However, the arrangement of the device E (secondary coil L2) placed on the placement surface 3 with respect to the primary coil L1 varies from time to time. If the arrangement is different, the leakage flux is different and the coupling coefficient is varied, so that the inductor component on the device E side changes. As a result, the resonance frequency determined by the inductor component and the capacitor component on the device E side varies depending on the arrangement mode. That is, depending on the arrangement of the secondary coil L2 with respect to the primary coil L1, the secondary coil L2 cannot efficiently receive the secondary power supplied from the primary coil L1.

  Therefore, in the present embodiment, as shown in FIGS. 3A to 3D, when the device E is placed on the placement surface 3, there are four arrangement modes of the secondary coil L2 with respect to the primary coil L1. It was assumed that

  Then, as shown in FIG. 3A, resonance characteristics (resonance frequency) determined by the inductor component and the capacitor component on the device E side under the condition that the secondary coil L2 is directly facing the one primary coil L1. This was determined as the first power supply frequency fp1.

  Further, as shown in FIG. 3B, the resonance characteristic (resonance frequency) determined by the inductor component and the capacitor component on the device E side under the condition that the secondary coil L2 straddles the two primary coils L1 is obtained. This was defined as the second power feeding frequency fp2.

  Further, as shown in FIG. 3C, the resonance characteristic (resonance frequency) determined by the inductor component and the capacitor component on the device E side under the condition where the secondary coil L2 straddles the three primary coils L1 is obtained. This was defined as the third power feeding frequency fp3.

  Furthermore, as shown in FIG. 3D, the resonance characteristic (resonance frequency) determined by the inductor component and the capacitor component on the device E side under the condition where the secondary coil L2 straddles the four primary coils L1 is obtained. This is the fourth power feeding frequency fp4.

  Therefore, the frequency of the high-frequency current supplied to the primary coil L1 is changed to one of the first to fourth power feeding frequencies fp1 to fp4 depending on each position mode of the secondary coil L2 with respect to the primary coil L1. Thereby, in each arrangement | positioning aspect, the secondary coil L2 can receive efficient electric power feeding from the primary coil L1.

In addition, each resonance characteristic (resonance frequency) in the arrangement | positioning conditions shown to Fig.3 (a)-(d) can be calculated | required by a test, experiment, calculation, etc.
In addition to the four types of first to fourth power feeding frequencies fp1 to fp4, each primary coil L1 is selected and supplied with a high frequency current having a presence detection frequency fs. . The high frequency current of the presence detection frequency fs is supplied to the primary coil L1 in order to detect whether the device E is placed in the power supply area AR (primary coil L1).

  The presence detection frequency fs is determined by the primary coil L1 on the power feeding device 1 side and the primary side resonance capacitor C1 (see FIG. 4) when nothing is placed on the power feeding area AR (primary coil L1). The frequency is obtained from the resonance characteristic (resonance frequency) of the primary circuit.

  That is, in the state where the primary coil L1 is excited and driven with the high frequency current of the presence detection frequency fs, the voltage of the primary coil L1 is different depending on whether the device E is present in the power supply area AR or not. Different. And the voltage of the primary coil L1 when the apparatus E exists compared with the case where the apparatus E does not exist. As a result, the presence or absence of the device E can be determined by knowing the voltage level of the primary coil L1.

  The presence detection frequency fs is a frequency obtained in advance by a test, experiment, calculation, or the like. Incidentally, the presence detection frequency fs is set in advance so that the distance from the first to fourth power feeding frequencies fp1 to fp4 is increased. This is because, when the primary coil L1 is excited and driven with the presence detection frequency fs to detect the presence of the primary coil L1, the adjacent primary coil L1 has the first to fourth power feeding frequencies fp1 to fp4. This is because it is not affected by excitation driving with either of the above.

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. 4, the device E includes a power receiving circuit 10 as a power receiving device that receives secondary power from the power feeding device 1 and a load Z.

As illustrated in FIG. 5, the power receiving circuit 10 includes a rectifier circuit 11 and a communication circuit 12.
The rectifier circuit 11 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 any of the first to fourth feed frequencies fp1 to fp4 radiated from the primary coil L1, and outputs the secondary power to the rectifier circuit 11. To do.

  The rectifier circuit 11 converts the secondary power generated in the secondary coil L2 by electromagnetic induction by excitation of the primary coil L1 into a DC voltage. The rectifier circuit 11 supplies the converted DC voltage to the load Z of the device E.

  Here, the load Z may be any device that is driven by the secondary power generated by the secondary coil L2. For example, it is a device that drives the load Z on the placement surface 3 using a DC power source converted by the rectifier circuit 11, or the load Z is placed on the placement surface 3 using secondary power as it is as an AC power source. It may be a driving device. Moreover, the apparatus which charges the built-in rechargeable battery (secondary battery) using the DC power source converted by the rectifier circuit 11 may be used.

  The DC voltage converted by the rectifier circuit 11 is also used as a drive source for the communication circuit 12. The communication circuit 12 is a circuit that generates a device authentication signal ID and a power supply request signal RQ and transmits the device authentication signal ID and the power supply request signal RQ to the power supply apparatus 1 through the secondary coil L2. The device authentication signal ID is an authentication signal indicating that the device E can receive power from the power supply device 1 with respect to the power supply device 1. The power supply request signal RQ is a request signal for requesting the power supply apparatus 1 to supply power.

  The device authentication signal ID and the power supply request signal RQ are binarized (high level / low level) signals composed of a plurality of bits, and the binarized signals are converted into the secondary resonance capacitor C2 and the rectifier circuit 11. Is output to the receiving wire that connects to. When a binarized signal is output to the receiving wire, the secondary coil is subjected to electromagnetic induction by excitation of the primary coil L1 that is driven and excited at any of the first to fourth power feeding frequencies fp1 to fp4. The amplitude of the secondary current flowing through L2 changes corresponding to the binarized signal.

  The magnetic flux radiated from the secondary coil L2 is changed by the change in the amplitude of the secondary current of any one of the first to fourth power feeding frequencies fp1 to fp4, and the changed magnetic flux propagates as electromagnetic induction to the primary coil L1. Then, the amplitude of the primary current flowing through the primary coil L1 is changed.

  That is, the secondary current flowing between both terminals of the secondary coil L2 is amplitude-modulated by the binarized signal (device authentication signal ID and power supply request signal RQ). The amplitude-modulated secondary current magnetic flux is propagated as a transmission signal to the primary coil L1.

  Incidentally, when the primary coil L1 is excited and driven at the presence detection frequency fs, the power receiving circuit 10 is largely separated from the resonance frequency determined on the device E side. For this reason, the power receiving circuit 10 does not receive sufficient power with respect to the power supplied from the primary coil L1, and does not operate.

(Power supply device 1)
As shown in FIG. 4, the power feeding device 1 including a plurality of primary coils L1 includes first to fourth power feeding oscillation circuit units 21 to 24, a presence detection oscillation circuit unit 25, a selection circuit unit 26, and system control. A portion 27 is provided. Each primary coil L1 is provided with a primary side resonance capacitor C1 that constitutes a primary circuit with the primary coil L1, and a current detection circuit 31, an output detection circuit 32, and a signal extraction circuit 33. Are provided.

(First to Fourth Power Supply Oscillator Circuits 21 to 24)
(First feeding oscillation circuit unit 21)
The first power supply oscillation circuit unit 21 is a circuit that generates a high-frequency current having a first power supply frequency fp1. The first power supply oscillation circuit unit 21 includes a first drive circuit 21a and a first inverter circuit 21b.

  The first drive circuit 21a receives the first control signal CT1 from the system control unit 27. The first drive circuit 21a generates a drive signal that sets the first power feeding frequency fp1 of the high-frequency current that flows through the primary coil L1 based on the first control signal CT1, and outputs the drive signal to the first inverter circuit 21b. Note that when the first control signal CT1 from the system control unit 27 disappears, the first drive circuit 21a does not output a drive signal to the first inverter circuit 21b.

  The first inverter circuit 21b generates a high-frequency current having the first power feeding frequency fp1 in response to the drive signal from the first drive circuit 21a, and outputs the high-frequency current to the selection circuit unit 26 via the first output terminal P1.

(Second power feeding oscillation circuit 22)
The second power supply oscillation circuit unit 22 is a circuit that generates a high-frequency current having the second power supply frequency fp2. The second power feeding oscillation circuit unit 22 includes a second drive circuit 22a and a second inverter circuit 22b.

  The second drive circuit 22a receives the second control signal CT2 from the system control unit 27. The second drive circuit 22a generates a drive signal that sets the second power feeding frequency fp2 of the high-frequency current that flows through the primary coil L1 based on the second control signal CT2, and outputs the drive signal to the second inverter circuit 22b. When the second control signal CT2 from the system control unit 27 is lost, the second drive circuit 22a does not output a drive signal to the second inverter circuit 22b.

  The second inverter circuit 22b generates a high-frequency current having the second power feeding frequency fp2 based on the drive signal from the second drive circuit 22a, and outputs the high-frequency current to the selection circuit unit 26 via the second output terminal P2.

(Third feeding oscillation circuit 23)
The third power supply oscillation circuit unit 23 is a circuit that generates a high-frequency current having a third power supply frequency fp3. The third power feeding oscillation circuit unit 23 includes a third drive circuit 23a and a third inverter circuit 23b.

  The third drive circuit 23a receives the third control signal CT3 from the system control unit 27. The third drive circuit 23a generates a drive signal that sets the third power feeding frequency fp3 of the high-frequency current that flows through the primary coil L1 based on the third control signal CT3, and outputs the drive signal to the third inverter circuit 23b. Note that when the third control signal CT3 from the system control unit 27 disappears, the third drive circuit 23a does not output a drive signal to the third inverter circuit 23b.

  The third inverter circuit 23b generates a high-frequency current having the third power feeding frequency fp3 based on the drive signal from the third drive circuit 23a, and outputs the high-frequency current to the selection circuit unit 26 via the third output terminal P3.

(Fourth feed oscillation circuit 24)
The fourth power supply oscillation circuit unit 24 is a circuit that generates a high-frequency current having a fourth power supply frequency fp4. The fourth power supply oscillation circuit unit 24 includes a fourth drive circuit 24a and a fourth inverter circuit 24b.

  The fourth drive circuit 24a receives the fourth control signal CT4 from the system control unit 27. The fourth drive circuit 24a generates a drive signal that sets the fourth power feeding frequency fp4 of the high-frequency current that flows through the primary coil L1 based on the fourth control signal CT4, and outputs the drive signal to the fourth inverter circuit 24b. Note that when the fourth control signal CT4 from the system control unit 27 disappears, the fourth drive circuit 24a does not output a drive signal to the fourth inverter circuit 24b.

  The fourth inverter circuit 24b generates a high-frequency current having the fourth power feeding frequency fp4 based on the drive signal from the fourth drive circuit 24a, and outputs the high-frequency current to the selection circuit unit 26 via the fourth output terminal P4.

(Presence detection oscillation circuit unit 25)
As shown in FIG. 4, the presence detection oscillation circuit unit 25 is a circuit that generates a high-frequency current having a presence detection frequency fs. The presence detection oscillation circuit unit 25 includes a fifth drive circuit 25a and a fifth inverter circuit 25b.

  The fifth drive circuit 25a receives the fifth control signal CT5 from the system control unit 27. The fifth drive circuit 25a generates a drive signal for setting the presence detection frequency fs of the high-frequency current flowing through the primary coil L1 based on the fifth control signal CT5, and outputs the drive signal to the fifth inverter circuit 25b. When the fifth control signal CT5 from the system control unit 27 is lost, the fifth drive circuit 25a does not output a drive signal to the fifth inverter circuit 25b.

  The fifth inverter circuit 25b generates a high-frequency current having the presence detection frequency fs based on the drive signal from the fifth drive circuit 25a, and outputs the high-frequency current to the selection circuit unit 26 via the fifth output terminal P5.

(Selection circuit unit 26)
As shown in FIG. 6, the selection circuit section 26 has 24 selection switch circuits 26a corresponding to the primary coils L1. The selection circuit section 26 has five first to fifth input terminals I1 to I5, and has the same number of output terminals O as the selection switch circuit 26a. The first input terminal I1 is connected to the first output terminal P1 of the first inverter circuit 21b, and the second input terminal I2 is connected to the second output terminal P2 of the second inverter circuit 22b. The third input terminal I3 is connected to the third output terminal P3 of the third inverter circuit 23b, and the fourth input terminal I4 is connected to the fourth output terminal P4 of the fourth inverter circuit 24b. Further, the fifth input terminal I5 is connected to the fifth output terminal P5 of the fifth inverter circuit 25b.

  The output terminal O provided corresponding to each selection switch circuit 26a is connected to one end of the corresponding primary coil L1. The output terminal O is connected to the current detection circuit 31, the primary side resonance capacitor C1, and the primary coil L1. Here, the primary resonance capacitor C1 may be connected between the output terminal O and the current detection circuit 31 or connected between the primary coil L1 and the ground.

(Selection switch circuit 26a)
As shown in FIG. 7, each selection switch circuit 26a includes five first to fifth bidirectional switches Q1 to Q5. In the present embodiment, the first to fifth bidirectional switches Q1 to Q5 are each composed of a GaN (gallium nitride) bidirectional switch device having a double gate.

  The first bidirectional switch Q1 enables conduction between the primary coil L1 and the first inverter circuit 21b when an ON signal switching signal is input to the two gate terminals. On the other hand, the first bidirectional switch Q1 cuts off the electrical connection between the primary coil L1 and the first inverter circuit 21b when both OFF gate switching signals are input to the two gate terminals.

  Further, the second bidirectional switch Q2 enables conduction between the primary coil L1 and the second inverter circuit 22b when both ON signal switching signals are input to the two gate terminals. On the other hand, the second bidirectional switch Q2 cuts off the conduction between the primary coil L1 and the second inverter circuit 22b when both OFF gate switching signals are input to the two gate terminals.

  Further, the third bidirectional switch Q3 enables conduction between the primary coil L1 and the third inverter circuit 23b when the ON signal switching signal is input to the two gate terminals. On the other hand, the third bidirectional switch Q3 cuts off the electrical connection between the primary coil L1 and the third inverter circuit 23b when both of the gate signals are input to the two gate terminals.

  Further, the fourth bidirectional switch Q4 enables conduction between the primary coil L1 and the fourth inverter circuit 24b when the ON signal switching signal is input to the two gate terminals. On the other hand, the fourth bidirectional switch Q4 cuts off the conduction between the primary coil L1 and the fourth inverter circuit 24b when the OFF signal switching signal is input to the two gate terminals.

  Further, the fifth bidirectional switch Q5 enables conduction between the primary coil L1 and the fifth inverter circuit 25b when an ON signal switching signal is input to the two gate terminals. On the other hand, the fifth bidirectional switch Q5 cuts off the conduction between the primary coil L1 and the fifth inverter circuit 25b when both OFF gate switching signals are input to the two gate terminals.

  The gate terminals of the first to fifth bidirectional switches Q <b> 1 to Q <b> 5 of each selection switch circuit 26 a are connected to the system control unit 27. Then, each selection switch circuit 26a makes one of the first to fifth inverter circuits 21b to 25b and the primary coil L1 conductive with each other based on a switching signal from the system control unit 27, or cuts off the conduction.

  That is, the system control unit 27 controls each selection switch circuit 26a. As a result, each primary coil L1 is selected and driven by exciting one of the first to fourth power feeding frequencies fp1 to fp4 and the high frequency current of the presence detecting frequency fs.

(Current detection circuit 31)
As shown in FIG. 4, the current detection circuit 31 provided for each primary coil L1 detects the primary current that flows through the primary coil L1, and outputs a current detection signal. The current detection circuit 31 outputs the current detection signal to the output detection circuit 32.

(Output detection circuit 32)
As shown in FIG. 4, the output detection circuit 32 provided for each primary coil L <b> 1 is connected to the current detection circuit 31. The output detection circuit 32 receives the current detection signal detected by the current detection circuit 31 while the primary coil L1 is excited by the high frequency current of the presence detection frequency fs, and outputs an output voltage relative to the current detection signal. , Convert to digital value and output. The output detection circuit 32 includes an envelope detection circuit, and detects the current detection signal of the current detection circuit 31 by the envelope detection circuit. The output detection circuit 32 (envelope detection circuit) generates an envelope waveform signal (output voltage Vs) obtained by extracting the envelope of the amplitude component of the current detection signal from the current detection signal.

  The output detection circuit 32 includes an AD converter that converts an analog value into a digital value, converts the output voltage Vs at that time into a digital value, and outputs the digital value to the system control unit 27.

(Signal extraction circuit 33)
As shown in FIG. 4, the signal extraction circuit 33 provided for each primary coil L <b> 1 is connected to the corresponding current detection circuit 31. While the primary coil L1 is being excited and driven by any one of the high-frequency currents having the first to fourth power feeding frequencies fp1 to fp4, the signal extraction circuit 33 receives from the current detection circuit 31 1 of the primary coil L1 at that time. Input the secondary current (current detection signal). The signal extraction circuit 33 inputs a current detection signal including an amplitude-modulated transmission signal transmitted from the secondary coil L2 of the device E placed on the placement surface 3.

  The signal extraction circuit 33 extracts the device authentication signal ID and the power supply request signal RQ from the current detection signal including the input transmission signal. The signal extraction circuit 33 outputs the permission signal EN to the system control unit 27 when extracting both the device authentication signal ID and the power supply request signal RQ from the transmission signal. Incidentally, the signal extraction circuit 33 does not output the permission signal EN to the system control unit 27 when only one of the device authentication signal ID and the power supply request signal RQ is extracted, or when neither signal is extracted. .

(System control unit 27)
As shown in FIG. 4, the system control unit 27 is composed of a microcomputer, and controls the high-frequency current that is excited and driven for each of the 24 primary coils L1 in accordance with a control program of the microcomputer.

  The system control unit 27 executes a presence detection process for determining whether or not the device E (secondary coil L2) is mounted on each power supply area AR and a power supply process for supplying power to the device E mounted in the power supply area AR. To do.

(Presence detection process)
The presence detection process is performed by exciting and driving each of the 24 primary coils L1 with a high-frequency current having a presence detection frequency fs.

  The system control unit 27 outputs the fifth control signal CT5 to the presence detection oscillation circuit unit 25, and causes the fifth inverter circuit 25b to generate a high-frequency current having the presence detection frequency fs. Then, the system control unit 27 outputs a switching signal to each selection switch circuit 26a of the selection circuit unit 26 corresponding to each primary coil L1, and energizes each primary coil L1 with a high-frequency current having a presence detection frequency fs. To do.

  Then, the system control unit 27 acquires the output voltage Vs from each output detection circuit 32 when the primary coil L1 is excited and driven by the high frequency current of the presence detection frequency fs, and acquires each primary coil. The presence detection of the device E (secondary coil L2) on L1 is performed.

  Incidentally, when the device E is present, the output voltage Vs is lower than when the device E is not present. Therefore, when the output voltage Vs is equal to or lower than a predetermined reference value, the system control unit 27 It is determined that the device E (secondary coil L2) is arranged on the primary coil L1. Here, the reference value is a value obtained in advance by a test, experiment, calculation or the like.

  At this time, when the device E is arranged, the system control unit 27 determines the arrangement mode of the secondary coil L2 with respect to the primary coil L1. Then, the system control unit 27 determines one of the arrangement modes shown in FIGS. 3A to 3D by comprehensively detecting the presence detection result of the adjacent primary coil L1. This is because the resonance frequency on the device E side differs depending on the arrangement of the device E (secondary coil L2), so that the power feeding frequency of the high-frequency current supplied to the primary coil L1 is specified.

  As shown in FIG. 3A, when the secondary coil L2 is directly opposed to one primary coil L1, the system control unit 27 performs the first feeding for the primary coil L1. It is specified that excitation driving is performed with a high-frequency current of frequency fp1.

  That is, when the system control unit 27 determines that the secondary coil L2 is opposed to one primary coil L1, and the secondary coil L2 is not opposed to the other adjacent primary coil L1, FIG. The arrangement mode shown in 3 (a) is specified. Then, the system control unit 27 excites the primary coil L1 with a high-frequency current having the first power feeding frequency fp1.

  As shown in FIG. 3B, when the secondary coil L2 straddles the two primary coils L1, the system control unit 27 sets the second power feeding frequency for the two primary coils L1. It is specified that excitation driving is performed with a high-frequency current of fp2.

  That is, in the system control unit 27, the secondary coil L2 is disposed opposite to the two adjacent primary coils L1, and the secondary coil L2 is opposed to the other primary coil L1 adjacent to the two primary coils L1. When it is determined that it is not arranged, the arrangement form shown in FIG. 3B is specified. The system control unit 27 excites the two primary coils L1 with a high-frequency current having the second power feeding frequency fp2.

  As shown in FIG. 3C, when the secondary coil L2 straddles the three primary coils L1, the system control unit 27 performs the third power feeding frequency for the three primary coils L1. It is specified that excitation driving is performed with a high-frequency current of fp3.

  That is, in the system control unit 27, the secondary coil L2 is disposed opposite to the three adjacent primary coils L1, and the secondary coil L2 is opposed to the other primary coils L1 adjacent to the three primary coils L1. When it is determined that it is not arranged, it is specified as the arrangement mode shown in FIG. Then, the system control unit 27 excites the three primary coils L1 with a high-frequency current having the third power feeding frequency fp3.

  As shown in FIG. 3D, when the secondary coil L2 straddles the four primary coils L1, the system control unit 27 sets the fourth power feeding frequency for the four primary coils L1. It is specified that excitation driving is performed with a high-frequency current of fp4.

  That is, in the system control unit 27, the secondary coil L2 is disposed opposite to the four adjacent primary coils L1, and the secondary coil L2 is opposed to the other primary coils L1 adjacent to the four primary coils L1. When it is determined that it is not arranged, it is specified as the arrangement mode shown in FIG. Then, the system control unit 27 excites the four primary coils L1 with a high-frequency current having the fourth power feeding frequency fp4.

(Power supply processing)
In the presence detection process, the system control unit 27 detects that the device E is placed, and when the arrangement mode is specified, the power supply of the specified arrangement mode is supplied to the specified primary coil L1. Excitation drive is performed with a high-frequency current that is a frequency.

  The system control unit 27 outputs the first to fourth control signals CT1 to CT4 to the first to fourth power feeding oscillation circuit units 21 to 24, and is output from the first to fourth inverter circuits 21b to 24b, respectively. The high frequency current of the 1st-4th electric power feeding frequency fp1-fp4 is produced | generated. And the system control part 27 controls each selection switch circuit 26a of the selection circuit part 26 with respect to the specified primary coil L1, and supplies the high frequency current which is the electric power feeding frequency of the specified arrangement | positioning aspect.

  The system control unit 27 controls the corresponding one selection switch circuit 26a to be electrically connected to the first inverter circuit 21b for one primary coil L1 that is identified as being excited and driven by the high-frequency current of the first power supply frequency fp1. .

  In addition, the system control unit 27 controls the corresponding two selection switch circuits 26a for the two primary coils L1 that are specified to be excited and driven by the high-frequency current of the second power feeding frequency fp2, respectively, thereby controlling the second inverter circuit 22b. And conduct each.

  Further, the system control unit 27 controls the corresponding three selection switch circuits 26a for the three primary coils L1 that are specified to be excited and driven by the high-frequency current of the third power feeding frequency fp3, respectively, thereby controlling the third inverter circuit 23b. And conduct each.

  In addition, the system control unit 27 controls the corresponding four selection switch circuits 26a for the four primary coils L1 that are specified to be excited and driven by the high-frequency current having the fourth power feeding frequency fp4, thereby controlling the fourth inverter circuit 24b. And conduct each.

  The system control unit 27 responds to the excitation-driven primary coil L1 when the primary coil L1 is excited and driven by any one of the first to fourth power feeding frequencies fp1 to fp4. The permission signal EN is awaited from the signal extraction circuit 33 that performs the processing.

  When there is no permission signal EN from the signal extraction circuit 33, the system control unit 27 stops the excitation drive of the high-frequency current of the power feeding frequency to the primary coil L1. Then, the system control unit 27 drives the primary coil L1 to be excited with a high-frequency current having a presence detection frequency fs. In other words, the system control unit 27 controls the corresponding selection switch circuit 26a for the primary coil L1 that has been excited and driven by the high-frequency current of the power feeding frequency, so as to be electrically connected to the fifth inverter circuit 25b.

On the other hand, when the permission signal EN is received from the signal extraction circuit 33, the system control unit 27 continues the excitation driving of the high frequency current of the power feeding frequency to the primary coil L1 and starts power feeding.
During power feeding, for example, when the device E is removed from the placement surface 3 and the permission signal EN disappears from the signal extraction circuit 33, the system control unit 27 has a high frequency for feeding power to the primary coil L1. Stops current excitation drive. Similarly to the above, the system control unit 27 drives the primary coil L1 to be excited with a high-frequency current having the presence detection frequency fs.

Next, the operation of the power feeding device 1 configured as described above will be described.
Now, when the power supply apparatus 1 is turned on, the system control unit 27 determines whether or not the device E is placed on the placement surface 3. That is, the system control unit 27 controls the presence detection oscillation circuit unit 25 and the selection circuit unit 26 to excite and drive the high frequency current of the presence detection frequency fs in order for all 24 primary coils L1. And the system control part 27 determines whether the apparatus E is mounted in each primary coil L1 in order based on the output voltage Vs from each output detection circuit 32. FIG.

  When specifying the 24 primary coils L1 thereafter, the four primary coils L1 in the horizontal row of the uppermost stage (first stage) of the power supply area AR are arranged in order from the left end to the right end. This is referred to as a fourth primary coil L1. The four primary coils L1 in the horizontal row of the lower stage (second stage) as viewed from the first stage are referred to as fifth to eighth primary coils L1 in order from the left end to the right end.

  Hereinafter, the four primary coils L1 in the horizontal row of the third stage are referred to as the ninth to twelfth primary coils L1 in order from the left end to the right end. The four primary coils L1 in the horizontal row of the fourth stage are referred to as the 13th to 16th primary coils L1 in order from the left end to the right end. The four primary coils L1 in the fifth horizontal row are called the 17th to 20th primary coils L1 in order from the left end to the right end. The four primary coils L1 in the sixth horizontal row are called the 21st to 24th primary coils L1 in order from the left end to the right end.

  Here, for example, if it is determined that the device E (secondary coil L2) is placed on the eighth primary coil L1 (power feeding area AR), the system control unit 27 determines that the arrangement mode of the device E is It is specified as the arrangement mode of FIG. The system control unit 27 controls the first power feeding oscillation circuit unit 21 and the selection circuit unit 26 to excite and drive the eighth primary coil L1 with a high-frequency current having the first power feeding frequency fp1.

  As a result, the secondary coil L2 facing the eighth primary coil L1 has a high efficiency of 2 with an alternating magnetic field of the first feeding frequency fp1 that matches the resonance frequency when facing the primary coil L1. Output next power.

  Next, the system control unit 27 inputs the permission signal EN from the signal extraction circuit 33 for the device E that receives power supply by exciting the eighth primary coil L1 with a high-frequency current having the first power supply frequency fp1. When the permission signal EN is input, the system control unit 27 continues the excitation drive by the high frequency current of the first power supply frequency fp1 for the eighth primary coil L1, and continues the power supply of the device E.

  While supplying the device E with the eighth primary coil L1, the system control unit 27 sequentially outputs the high-frequency current of the presence detection frequency fs for each primary coil excluding the eighth primary coil L1. Drive excitation. And the system control part 27 detects whether the new apparatus E is mounted in each primary coil L1 except the 8th primary coil L1.

  For example, when a new second device E (secondary coil L2) is placed across the sixth and tenth primary coils L1 (power supply area AR), the system control unit 27 It is specified that the arrangement mode of the device E is the arrangement mode of FIG. The system control unit 27 controls the second power supply oscillation circuit unit 22 and the selection circuit unit 26 to excite and drive the sixth and tenth primary coils L1 with a high-frequency current having the second power supply frequency fp2.

  As a result, the secondary coil L2 disposed across the sixth and tenth primary coils L1 has an alternating magnetic field of the second feeding frequency fp2 that matches the resonance frequency when straddling the two primary coils L1. To output highly efficient secondary power.

  Next, the system control unit 27 sends an enabling signal EN for the new second device E that receives power supply by exciting the sixth and tenth primary coils L1 with a high-frequency current of the second power supply frequency fp2. Input from the signal extraction circuit 33. When the permission signal EN is input, the system control unit 27 continues excitation driving with the high-frequency current of the second power feeding frequency fp2 for the sixth and tenth primary coils L1, and the new second device E Continue power supply.

Therefore, at this time, the first first device E is supplied with power by the eighth primary coil L1, and the second device E is supplied with power by the sixth and tenth primary coils L1.
While supplying power to the first device E and the second device E, the system control unit 27 sequentially detects the presence of each primary coil except the eighth, sixth, and tenth primary coils L1. A high-frequency current having a frequency fs is excited and driven. And the system control part 27 detects whether the new apparatus E is mounted in each primary coil L1 except the 8th, 6th, and 10th primary coil L1.

  Here, for example, when a new third device E (secondary coil L2) is placed across the 15th, 16th and 20th primary coils L1 (power feeding area AR), the system control unit 27 Specifies that the arrangement mode of the third device E is the arrangement mode of FIG. The system control unit 27 controls the third power feeding oscillation circuit unit 23 and the selection circuit unit 26 to excite and drive the 15th, 16th, and 20th primary coils L1 with a high-frequency current of the third power feeding frequency fp3. To do.

  As a result, the secondary coil L2 disposed across the 15th, 16th, and 20th primary coils L1 has a third feeding frequency fp3 that matches the resonance frequency when straddling the three primary coils L1. High-efficiency secondary power is output with an alternating magnetic field.

  Next, the system control unit 27 permits the 15th, 16th, and 20th primary coils L1 to be excited and driven by the high-frequency current of the third power feeding frequency fp3 for the new third device E that receives power. The signal EN is input from the signal extraction circuit 33. When the enabling signal EN is input, the system control unit 27 continues the excitation driving with the high-frequency current of the third power feeding frequency fp3 for the 15th, 16th, and 20th primary coils L1, and starts a new third operation. Continue to supply power to device E.

  Therefore, at this point, the first device E in the eighth primary coil L1, the second device E in the sixth and tenth primary coils L1, the fifteenth, sixteenth and twentieth primary coils. The third device E is fed with the coil L1.

  While supplying power to the first to third devices E, the system control unit 27 applies the primary coils excluding the eighth, sixth, fifteenth, fifteenth, and twentieth primary coils L1. The high-frequency current having the presence detection frequency fs is sequentially excited and driven. And the system control part 27 detects whether the new apparatus E is mounted in each primary coil L1 except the primary coil L1 during these electric power feeding.

  Here, for example, when a new fourth device E (secondary coil L2) is placed across the 17th, 18th, 21st and 22nd primary coils L1 (power feeding area AR), the system The control unit 27 specifies that the arrangement mode of the fourth device E is the arrangement mode illustrated in FIG. The system control unit 27 controls the fourth power feeding oscillation circuit unit 24 and the selection circuit unit 26, and converts the 17th, 18th, 21st and 22nd primary coils L1 to a high frequency current of the fourth power feeding frequency fp4. Drive.

  As a result, the secondary coil L2 disposed across the 17th, 18th, 21st and 22nd primary coils L1 has a fourth power feed that matches the resonance frequency when straddling the four primary coils L1. High-efficiency secondary power is output with an alternating magnetic field of frequency fp4.

  Next, the system control unit 27 adds a new fourth device that receives power supply by exciting the 17th, 18th, 21st, and 22nd primary coils L1 with a high-frequency current of the fourth power supply frequency fp4. For E, an enable signal EN is input from the signal extraction circuit 33. When the enabling signal EN is input, the system control unit 27 continues the excitation driving with the high-frequency current of the fourth power feeding frequency fp4 for the 17th, 18th, 21st and 22nd primary coils L1, and starts a new operation. The power supply of the fourth device E is continued.

Therefore, at this time, the system control unit 27 is fed with the fourth device E by the 17th, 18th, 21st and 22nd primary coils L1 in addition to the first to third devices E. The
While supplying power to the first to fourth devices E, the system control unit 27 sequentially drives the high-frequency current of the presence detection frequency fs for each primary coil except the primary coil L1 that is being supplied. . And the system control part 27 detects whether the new apparatus E is mounted in each primary coil L1 except the primary coil L1 during these electric power feeding.

  Thus, even if the apparatus E is mounted on the mounting surface 3 so that the arrangement mode of the secondary coil L2 is different from the primary coil L1, the first to fourth power feedings are arranged in accordance with the arrangement mode. The primary coil L1 is excited and driven with a high-frequency current having a frequency of fp1 to fp4. That is, no matter how the device E is arranged on the mounting surface 3, the power feeding device 1 has the first to fourth power feeding frequencies fp1 to fp4 that are the resonance frequencies on the device E side according to the arrangement mode. The high-frequency current is selected and high-efficiency power feeding is performed.

Here, the case where the first to fourth devices E are placed in different arrangement modes has been described.
In contrast, for example, it is considered that the above-described fourth device E is placed across the 18th and 22nd primary coils L1 (power feeding area AR). In that case, the system control unit 27 specifies that the arrangement mode of the fourth device E is the arrangement mode illustrated in FIG. The system control unit 27 controls the selection circuit unit 26 to excite and drive the 18th and 22nd primary coils L1 with a high-frequency current having the second power feeding frequency fp2.

  That is, the sixth and tenth primary coils L1 that supply power to the second device E and the 18th and 22nd primary coils L1 that supply power to the fourth device E include the second power supply oscillation. Excitation driving is performed using a high-frequency current of the second power feeding frequency fp2 from the circuit unit 22 in common.

  Similarly, consider a case where, for example, all of the first to fourth devices E are placed in the arrangement mode shown in FIG. In this case, the system control unit 27 controls the second power feeding oscillation circuit unit 22 and the selection circuit unit 26, and each of the corresponding two primary coils L1 is used for the second power feeding from the second power feeding oscillation circuit unit 22. Excitation drive is performed with a high-frequency current of frequency fp2.

  In the present embodiment, the first to fourth power supply oscillation circuit units 21 to 24 and the presence detection oscillation circuit unit 25 are shared without providing a dedicated oscillation circuit unit for each primary coil L1. Therefore, the selection circuit unit 26 is provided so that it can be used under any conditions. Each selection switch circuit 26a provided in the selection circuit section 26 is a simple and small-scale circuit including five first to fifth bidirectional switches Q1 to Q5.

  Thus, when the first to fourth power feeding oscillation circuit units 21 to 24 and the presence detection oscillation circuit unit 25 are shared, rather than providing a dedicated oscillation circuit unit for each primary coil L1, respectively. The circuit scale can be reduced, and the entire apparatus can be reduced in size.

Next, effects of the embodiment configured as described above will be described below.
(1) According to the above-described embodiment, the first to fourth power feeds for generating the high-frequency current of the first to fourth power feed frequencies fp1 to fp4 according to the resonance frequency on the device E side for each arrangement mode of the device E. Oscillation circuit portions 21 to 24 were provided. Then, the first to fourth power feeding oscillation circuit units 21 to 24 are selected according to the arrangement mode of the device E, and the first to fourth power feeding frequencies fp1 according to the resonance frequency on the device E side in the arrangement mode at that time. The primary coil L1 was excited and driven with a high-frequency current of ˜fp4.

Accordingly, the device E can receive highly efficient power supply according to the arrangement mode.
(2) According to the above embodiment, each of the 24 primary coils L1 does not have a dedicated high-frequency oscillation circuit unit for power supply, and shares the first to fourth power-supply oscillation circuit units 21 to 24. The circuit scale is reduced, the entire apparatus can be reduced in size, and the cost can be reduced.

  In addition, in the selection circuit unit 26, each primary coil L1 can be excited and driven at the same time with a high-frequency current having the same power supply frequency or a different power supply frequency as the other primary coils L1. As a result, a plurality of devices E can be placed on the placement surface 3 at the same time, and highly efficient power feeding can be performed for each device E.

  (3) According to the above embodiment, each of the 24 primary coils L1 shares the presence detecting oscillation circuit unit 25, so the circuit scale is reduced, the entire apparatus can be downsized, and the cost can be reduced. Can do.

(Second Embodiment)
Next, a second embodiment will be described.
In the second embodiment, a single high-frequency oscillation circuit unit for power supply is used, and the primary coil L1 is shared by one, and the capacity of the primary side resonance capacitor C1 connected to each primary coil L1 is changed. The difference from the first embodiment is that the capacitor circuit can be changed. Therefore, in the second embodiment, for the sake of convenience of explanation, the changed part will be described in detail, and the details of the common parts will be omitted.

  Here, in the first embodiment, the capacitance of the primary side resonance capacitor C1 connected to the primary coil L1 is set to a fixed value, and the power supply frequency is set to the first to fourth power supply according to the arrangement of the secondary coil L2. One of the operating frequencies fp1 to fp4 was selected.

On the other hand, in the second embodiment, the feeding frequency is fixed to one and the capacitance (resonance parameter) of the capacitor circuit is adjusted according to the arrangement mode of the secondary coil L2.
That is, for example, the fixed power supply frequency is set as the first power supply frequency fp1. 3A, when the primary coil L1 is excited and driven with a high-frequency current of the first power supply frequency fp1, the first power supply frequency fp1 is the resonance frequency viewed from the device E side. It is assumed that high-efficiency power feeding is performed.

  Therefore, when the secondary coil L2 is arranged as shown in FIGS. 3A to 3B, the leakage magnetic flux (coupling coefficient) between the primary coil L1 and the secondary coil L2 increases. As a result, the primary side circuit on the primary coil L1 side does not match (match) with the secondary side circuit on the secondary coil L2 side.

  Therefore, for the purpose of matching, under the condition that the power supply frequency is fixed to the first power supply frequency fp1, the fluctuation of the inductance component due to the increase of the leakage flux is caused by the resonance capacitor provided in the primary circuit on the primary coil L1 side. What is necessary is just to compensate by a capacitor component. As a result, the primary side circuit on the primary coil L1 side is matched with the secondary side circuit on the secondary coil L2 side without changing the frequency of the high frequency current for power supply, and highly efficient power feeding is performed.

  Therefore, in the second embodiment, even if the secondary coil L2 is arranged in various manners by compensating the variation of the inductance component based on the arrangement manner with the capacitor component of the resonance capacitor provided in the primary side circuit. It is designed to supply power with high efficiency.

Details of the second embodiment will be described below with reference to FIGS.
In the second embodiment, for convenience of explanation, the second to fourth power feeding oscillation circuit units 22 to 24 are omitted, and only the first power feeding oscillation circuit unit 21 is used. Therefore, each selection switch circuit 26a of the selection circuit unit 26 is a circuit that selects either the high-frequency current of the first power feeding frequency fp1 or the presence detection frequency fs and is controlled by the system control unit 27.

(Resonant capacitor circuit 40)
As shown in FIG. 8, the resonant capacitor circuit 40 is provided between each current detection circuit 31 and each primary coil L1. As shown in FIG. 9, each resonance capacitor circuit 40 is configured by connecting first to fifth resonance circuits 41 to 45 in parallel.

(First resonance circuit 41)
In FIG. 9, the first resonance circuit 41 is a series circuit of a first bidirectional switch Qa and a first resonance capacitor Ca. The first bidirectional switch Qa is a GaN (gallium nitride) bidirectional switch device having a double gate, and is ON / OFF controlled by a switching signal from the system control unit 27.

  The first bidirectional switch Qa enables conduction between the current detection circuit 31 and the primary coil L1 via the first resonance capacitor Ca when an ON signal switching signal is input to the two gate terminals. To do. On the other hand, the first bidirectional switch Qa cuts off the conduction between the current detection circuit 31 and the primary coil L1 when both of the two gate terminals receive an OFF signal switching signal.

  The capacity of the first resonance capacitor Ca is a state in which the secondary coil L2 is arranged in the arrangement mode shown in FIG. 3A, and the primary coil L1 is driven and excited by a high-frequency current of the first power feeding frequency fp1. It is set to the value selected when you want to. That is, the capacity of the first resonance capacitor Ca is such that the primary side on the power feeding device 1 side is driven when the primary coil L1 is driven and excited by the high frequency current of the first power feeding frequency fp1 in the arrangement mode shown in FIG. It is a capacity for matching the circuit with the secondary circuit on the device E side.

(Second resonance circuit 42)
In FIG. 9, the second resonance circuit 42 is a series circuit of a second bidirectional switch Qb and a second resonance capacitor Cb. The second bidirectional switch Qb is a GaN (gallium nitride) bidirectional switch device having a double gate, and is ON / OFF controlled by a switching signal from the system control unit 27.

  The second bidirectional switch Qb enables conduction between the current detection circuit 31 and the primary coil L1 via the second resonant capacitor Cb when an ON signal switching signal is input to the two gate terminals. To do. On the other hand, the second bidirectional switch Qb cuts off the conduction between the current detection circuit 31 and the primary coil L1 when the off signal switching signal is input to the two gate terminals.

  The capacity of the second resonant capacitor Cb is a state in which the secondary coil L2 is arranged in the arrangement mode shown in FIG. 3B, and the primary coil L1 is driven and excited by a high-frequency current of the first feeding frequency fp1. It is set to the value selected when you want to. That is, the capacity of the second resonance capacitor Cb is the primary side on the power feeding device 1 side when the primary coil L1 is driven and excited with the high frequency current of the first power feeding frequency fp1 in the arrangement mode shown in FIG. It is a capacity for matching the circuit with the secondary circuit on the device E side.

(Third resonant circuit 43)
In FIG. 9, the third resonance circuit 43 is a series circuit of a third bidirectional switch Qc and a third resonance capacitor Cc. The third bidirectional switch Qc is a GaN (gallium nitride) bidirectional switch device having a double gate, and is ON / OFF controlled by a switching signal from the system control unit 27.

  The third bidirectional switch Qc enables conduction between the current detection circuit 31 and the primary coil L1 via the third resonance capacitor Cc when an ON signal switching signal is input to the two gate terminals. To do. On the other hand, the third bidirectional switch Qc cuts off the conduction between the current detection circuit 31 and the primary coil L1 when both OFF gate switching signals are input to the two gate terminals.

  The capacity of the third resonance capacitor Cc is a state in which the secondary coil L2 is arranged in the arrangement shown in FIG. 3C, and the primary coil L1 is driven and excited by a high-frequency current of the first power feeding frequency fp1. It is set to the value selected when you want to. That is, the capacity of the third resonance capacitor Cc is equal to the primary side on the power feeding device 1 side when the primary coil L1 is driven and excited with the high frequency current of the first power feeding frequency fp1 in the arrangement mode shown in FIG. It is a capacity for matching the circuit with the secondary circuit on the device E side.

(Fourth resonance circuit 44)
In FIG. 9, the fourth resonance circuit 44 is a series circuit of a fourth bidirectional switch Qd and a fourth resonance capacitor Cd. The fourth bidirectional switch Qd is a GaN (gallium nitride) bidirectional switch device having a double gate, and is ON / OFF controlled by a switching signal from the system control unit 27.

  The fourth bidirectional switch Qd enables conduction between the current detection circuit 31 and the primary coil L1 via the fourth resonance capacitor Cd when both ON signal switching signals are input to the two gate terminals. On the other hand, the fourth bidirectional switch Qd cuts off the conduction between the current detection circuit 31 and the primary coil L1 when both of the two gate terminals receive OFF signal switching signals.

  The capacity of the fourth resonance capacitor Cd is the state in which the secondary coil L2 is arranged in the arrangement shown in FIG. 3D, and the primary coil L1 is driven and excited by a high-frequency current of the first power feeding frequency fp1. It is set to the value selected when you want to. That is, the capacity of the fourth resonance capacitor Cd is the primary side on the power feeding device 1 side when the primary coil L1 is driven and excited by the high frequency current of the first power feeding frequency fp1 in the arrangement mode shown in FIG. It is a capacity for matching the circuit with the secondary circuit on the device E side.

(Fifth resonance circuit 45)
In FIG. 9, the fifth resonance circuit 45 is a series circuit of a fifth bidirectional switch Qe and a fifth resonance capacitor Ce. The fifth bidirectional switch Qe is a GaN (gallium nitride) bidirectional switch device having a double gate, and is ON / OFF controlled by a switching signal from the system control unit 27.

  The fifth bidirectional switch Qe enables conduction between the current detection circuit 31 and the primary coil L1 via the fifth resonance capacitor Ce when both ON signal switching signals are input to the two gate terminals. To do. On the other hand, the fifth bidirectional switch Qe cuts off the conduction between the current detection circuit 31 and the primary coil L1 when both of the two gate terminals receive an OFF signal switching signal.

  The capacitance of the fifth resonance capacitor Ce is selected when the device E (secondary coil L2) is not placed and the primary coil L1 is driven and excited with a high-frequency current of the presence detection frequency fs. Value is set. That is, when the primary coil L1 is driven and excited by the high frequency current of the presence detection frequency fs in the arrangement mode in which nothing is placed, the capacity of the fifth resonance capacitor Ce is the primary side circuit on the power feeding device 1 side. Is the capacity to match.

  And, when the first to fourth resonance circuits 41 to 44 are fed using the primary coil L1, any one of the first to fourth resonance circuits 41 to 44 is determined by a switching signal from the system control unit 27 depending on the arrangement of the secondary coil L2. Selected. Then, a high-frequency current having the first power feeding frequency fp1 is supplied to the primary coil L1 through the selected resonance circuit.

  The fifth resonance circuit 45 is selected by a switching signal from the system control unit 27 when detecting whether or not the device E (secondary coil L2) is placed on the primary coil L1. Then, the high frequency current of the presence detection frequency fs is supplied to the primary coil L1 through the selected fifth resonance capacitor Ce.

In addition, the value of 1st-5th resonance capacitor Ca-Ce is the value calculated | required by the test, experiment, calculation, etc. previously.
Next, the effect | action of the electric power feeder 1 of 2nd Embodiment is demonstrated.

  In the second embodiment, similarly to the first embodiment, the high-frequency current of the presence detection frequency fs is sequentially excited and driven for all 24 primary coils L1, and the system control unit 27 sequentially sets each 1 It is determined whether or not the device E is placed on the next coil L1.

  When the device E is placed in the arrangement mode of FIG. 3A, the system control unit 27 controls the first power feeding oscillation circuit unit 21 and the selection circuit unit 26 and also the first resonance circuit 41. The first resonance capacitor Ca is selectively controlled. The high-frequency current having the first power feeding frequency fp1 excites the primary coil L1 that is directly opposed via the first resonance capacitor Ca.

As a result, the primary circuit on the power feeding device 1 side matches the secondary circuit on the device E side, and the secondary coil L2 facing the primary coil L1 outputs highly efficient secondary power.
3B, the system control unit 27 controls the first power supply oscillation circuit unit 21 and the selection circuit unit 26, and the second resonance circuit 42. The second resonance capacitor Cb is selectively controlled. The high-frequency current of the first power feeding frequency fp1 excites the two primary coils L1 across the secondary coil L2 via the second resonance capacitor Cb.

As a result, the primary circuit on the power feeding device 1 side matches the secondary circuit on the device E side, and the secondary coil L2 straddling the two primary coils L1 outputs high-efficiency secondary power. .
Further, when the device E is placed in the arrangement mode of FIG. 3C, the system control unit 27 controls the first power feeding oscillation circuit unit 21 and the selection circuit unit 26, and the third resonance circuit 43. The third resonance capacitor Cc is selectively controlled. The high-frequency current having the first power feeding frequency fp1 excites the three primary coils L1 across the secondary coil L2 via the third resonance capacitor Cc.

As a result, the primary circuit on the power feeding device 1 side matches the secondary circuit on the device E side, and the secondary coil L2 straddling the three primary coils L1 outputs highly efficient secondary power. .
Further, when the device E is placed in the arrangement mode of FIG. 3D, the system control unit 27 controls the first power feeding oscillation circuit unit 21 and the selection circuit unit 26, and the fourth resonance circuit 44. The fourth resonance capacitor Cd is selectively controlled. The high frequency current of the first power feeding frequency fp1 excites the four primary coils L1 across the secondary coil L2 via the fourth resonance capacitor Cd.

As a result, the primary circuit on the power feeding device 1 side matches the secondary circuit on the device E side, and the secondary coil L2 straddling the four primary coils L1 outputs highly efficient secondary power. .
Moreover, each resonance capacitor circuit 40 can select any one of the first to fourth resonance capacitors Ca to Cd independently of each other. Therefore, when a plurality of devices E are simultaneously arranged on the mounting surface 3, highly efficient power feeding is performed because the capacitance (resonance parameter) of the resonance capacitor circuit 40 can be independently changed for each device E. be able to.

  Further, in the present embodiment, one power supply oscillation circuit unit of the first power supply oscillation circuit unit 21 is shared without providing a dedicated power supply oscillation circuit unit for each primary coil L1. In addition, the first to fifth resonance circuits 41 to 45 provided in the resonance capacitor circuit 40 are simply composed of five first to fifth bidirectional switches Qa to Qe and first to fifth resonance capacitors Ca to Ce. Consists of a small circuit. As a result, the circuit scale can be reduced and the entire apparatus can be reduced in size.

Next, the effect of 2nd Embodiment comprised as mentioned above is described below.
(1) According to the second embodiment, when power is supplied to the device E with the high-frequency current having the first power supply frequency fp1, the capacitance of the resonant capacitor circuit 40 is set to 1 on the power supply device side for each arrangement mode of the device E. The secondary circuit and the secondary circuit on the device E side were changed to match.

  Specifically, depending on the arrangement mode of the device E, one of the first to fourth resonance capacitors Ca to Cd having different capacities is selected, and the primary circuit on the power feeding device side matches the secondary circuit on the device E side. The device E was supplied with power.

Accordingly, the device E can receive highly efficient power supply according to the arrangement mode.
(2) According to the second embodiment, each of the 24 primary coils L1 is not provided with a dedicated high-frequency oscillation circuit unit for power supply, and the circuit for the first power-supply oscillation circuit unit 21 is shared. The scale can be reduced, the entire apparatus can be reduced in size, and the cost can be reduced.

  Moreover, since each resonance capacitor circuit 40 can select any one of the first to fourth resonance capacitors Ca to Cd independently of each other, even if a plurality of devices E are simultaneously arranged on the placement surface 3, respectively. It is possible to perform highly efficient power supply to the device E.

  (3) According to the second embodiment, each of the 24 primary coils L1 shares one existence detecting oscillation circuit unit 25, so the circuit scale is reduced, the entire apparatus can be reduced in size, and the cost is further reduced. You can go down.

In addition, you may change the said embodiment as follows.
In the first embodiment, four first to fourth power feeding oscillation circuit units 21 to 24 are provided. However, in order to further increase the power supply efficiency, the arrangement of the secondary coil L2 with respect to the primary coil L1 is further subdivided, and the number of subdivided numbers is added to form an additional number of power supply oscillation circuit units. May be implemented. On the contrary, it may be implemented by two or three.

  In the second embodiment, four first to fourth resonance circuits 41 to 44 (first to fourth resonance capacitors Ca to Cd) are provided. However, in order to increase the power supply efficiency, the arrangement of the secondary coil L2 with respect to the primary coil L1 is further subdivided, and the number of subdivided numbers is added to form an additional number of resonance circuits. May be. On the contrary, it may be implemented by two or three.

  In the first embodiment, the selection circuit unit 26 includes each of the selection switch circuits 26a including five first to fifth bidirectional switches Q1 to Q5, and the first to fourth power feeding oscillation circuit units 21 to 21 are configured. 24 and the presence detection oscillation circuit section 25 are selected. However, it is not limited to this. The point is that the selection circuit unit 26 can perform excitation driving for each primary coil L1 at the same time with a high-frequency current having the same power supply frequency or a different power supply frequency as the other primary coils L1. Good.

  In the second embodiment, the resonance capacitor circuit 40 opens and closes the five first to fifth bidirectional switches Qa to Qe of the first to fifth resonance circuits 41 to 45 to select the resonance parameter capacitance. It was configured as follows. However, it is not limited to this. In short, the resonance capacitor circuit 40 may be any circuit that can select various capacitances independently of the other resonance capacitor circuits 40.

  In each of the above embodiments, the power feeding device 1 has the primary coils L1 arranged in parallel in the two-dimensional direction. You may apply this to the electric power feeder which arranged the primary coil L1 in parallel in the one-dimensional direction. In this case, for example, the case where the secondary coil L2 shown in FIG. 3A is directly opposed to one primary coil L1 and the case where the secondary coil L2 shown in FIG. 3B is two primary coils L1. The case where it straddles is assumed. Accordingly, the first power supply oscillation circuit unit 21 that generates a high-frequency current at the first power supply frequency fp1 and the second power supply oscillation circuit unit 22 that generates a high-frequency current at the second power supply frequency fp2 are provided. become.

  Of course, in order to further increase the power supply efficiency, the arrangement of the secondary coil L2 with respect to the primary coil L1 is further subdivided in a one-dimensional direction, and the subdivided number is added, and the added number of oscillations for power supply is added. A circuit portion may be formed and implemented.

Moreover, although the housing | casing 2 of the electric power feeder 1 of the said embodiment was formed in square shape, it is not limited to this, You may implement in another polygonal shape, circular shape, elliptical shape, etc.
In each of the above embodiments, the power supply device 1 has the primary coils L1 arranged in a two-dimensional direction and in a lattice shape (matrix shape). Alternatively, adjacent rows of primary coils L1 arranged in parallel in the vertical direction on both the left and right sides may be arranged in a zigzag lattice pattern with the phase shifted by 180 degrees in the vertical direction. In this case, there are roughly three modes of the relative arrangement of the secondary coil L2 with respect to the primary coil L1. That is, when the secondary coil L2 is directly opposed to one primary coil L1, when the secondary coil L2 straddles two primary coils L1, the secondary coil L2 is three primary coils L1. It is three when straddling. Therefore, three power supply oscillation circuit units are provided.

  In the above embodiments, the output detection circuit 32 detects the presence or absence of the device E (secondary coil L2) based on the current detection signal (primary current) of the current detection circuit 31. For example, a photo sensor may be provided in each power supply area AR of the placement surface 3 to detect the presence or absence of the device E to be placed.

  In the second embodiment, the resonant capacitor circuit 40 is connected in series to the primary coil L1, but may be implemented by connecting it in parallel to the primary coil L1. Good.

  In each of the above embodiments, the first to fifth bidirectional switches Q1 to Q5 and the first to fifth bidirectional switches Qa to Qe are configured by GaN (gallium nitride) bidirectional switching devices having double gates. . 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 first embodiment, the primary side resonance capacitor C1 that forms the primary circuit with the primary coil L1 may be replaced with the resonance capacitor circuit 40 of the second embodiment. At this time, for example, the first to fourth resonance circuits 41 to 44 of each resonance capacitor circuit 40 are preferably provided corresponding to the first to fourth power feeding frequencies fp1 to fp4, respectively. As a result, more efficient power feeding can be performed.

  DESCRIPTION OF SYMBOLS 1 ... Non-contact electric power feeder (power feeder), 2 ... Housing, 3 ... Mounting surface, 10 ... Power receiving circuit, 11 ... Rectifier circuit, 12 ... Communication circuit, 21-24 ... Oscillator circuit for 1st-4th electric power feeding Parts (power supply high-frequency oscillation means), 21a to 24a ... 1st to 4th drive circuits, 21b to 24b ... 1st to 4th inverter circuits, 25 ... existence detection oscillation circuit part (presence detection means, presence detection oscillation) Means), 26 ... selection circuit section (selection means), 26a ... selection switch circuit, 27 ... system control section (arrangement mode specifying means, control means), 31 ... current detection circuit (presence detection means), 32 ... output detection circuit (Presence detecting means), 33 ... signal extraction circuit, 40 ... resonance capacitor circuit (variable resonance circuit), 41-45 ... first to fifth resonance circuits, E ... electric equipment (device), AR ... feed area, L1 ... Primary coil, L2 ... Secondary coil, C1 C2... Primary and secondary resonance capacitors, Ca to Ce, 1st to 5th resonance capacitors, fp1 to fp4, 1st to 4th power feeding frequency, fs ... Presence detection frequency, CT1 to CT5, 1st -5th control signal, Q1-Q5 ... 1st-5th bidirectional switch, Qa-Qe ... 1st-5th bidirectional switch (open / close switch), ID ... Device authentication signal, RQ ... Power supply request signal, EN ... Permission signal,

Claims (8)

When a plurality of primary coils that generate an alternating magnetic field when energized with a high-frequency current are arranged side by side in a one-dimensional direction or a two-dimensional direction, and a power receiving device is disposed opposite to at least one of the primary coils, the primary coil A non-contact power feeding device in which a coil alone or in cooperation with another primary coil generates the alternating magnetic field to generate secondary power in the secondary coil of the power receiving device by electromagnetic induction. ,
A plurality of power supply high-frequency oscillation means less than the number of primary coils that respectively generate the high-frequency currents having different frequencies;
Selection means for selecting one of the plurality of high-frequency oscillation means for feeding and energizing a high-frequency current of the selected frequency for each of the plurality of primary coils;
An arrangement mode specifying means for specifying an arrangement mode of the secondary coil of the power receiving device arranged to face at least one of the primary coils;
The selection to supply any one of the high-frequency currents of the plurality of high-frequency oscillation means for power supply to each primary coil based on the arrangement of the secondary coil of the power receiving device specified by the arrangement-specifying means. A non-contact power feeding apparatus comprising control means for selectively controlling the means. The contactless power supply device according to claim 1,
The selection means includes a selection switch circuit for each primary coil, and the selection switch circuit selects any one of the plurality of power supply high-frequency oscillation means, and the selected power supply high-frequency oscillation means A non-contact power feeding device, wherein a high-frequency current having a power feeding frequency is passed through a primary coil. In the non-contact electric power feeder of Claim 1 or 2,
The arrangement mode specifying unit includes a presence detection unit that detects the presence / absence of a power receiving device for each primary coil, and determines the arrangement mode of the secondary coil of the power receiving device based on the detection result of each of the presence detection units. A non-contact power feeding device characterized by specifying. In the non-contact electric power feeder of Claim 3,
The presence detection means includes presence detection oscillation means for generating a high-frequency current having a presence detection frequency, and is based on a current flowing through the primary coil by passing the high-frequency current having the presence detection frequency through the primary coil. And detecting the presence or absence of the power receiving device. When a plurality of primary coils that generate an alternating magnetic field when energized with a high-frequency current are arranged side by side in a one-dimensional direction or a two-dimensional direction, and a power receiving device is disposed opposite to at least one of the primary coils, the primary coil A non-contact power feeding device in which a coil alone or in cooperation with another primary coil generates the alternating magnetic field to generate secondary power in the secondary coil of the power receiving device by electromagnetic induction. ,
A variable resonance circuit which is provided for each of the plurality of primary coils and forms a primary circuit on the power feeding device side together with the primary coil;
An arrangement mode specifying means for specifying an arrangement mode of the secondary coil of the power receiving device arranged to face at least one of the primary coils;
A non-contact power feeding apparatus comprising: a control unit configured to change a resonance parameter of the variable resonance circuit based on an arrangement mode of the secondary coil of the power receiving device specified by the arrangement mode specifying unit. In the non-contact electric power feeder of Claim 5,
In the variable resonance circuit, capacitors having different capacities are connected in series with open / close switches, and the series circuits are connected in parallel, and the open / close switches are controlled to open and close by the control means. A non-contact power feeding device characterized in that a capacity of a resonance parameter is changed. In the non-contact electric power feeder of Claim 5 or 6,
The arrangement mode specifying unit includes a presence detection unit that detects the presence / absence of a power receiving device for each primary coil, and determines the arrangement mode of the secondary coil of the power receiving device based on the detection result of each of the presence detection units. A non-contact power feeding device characterized by specifying. In the non-contact electric power feeder of Claim 7,
The presence detection means includes presence detection oscillation means for generating a high-frequency current having a presence detection frequency, and is based on a current flowing through the primary coil by passing the high-frequency current having the presence detection frequency through the primary coil. And detecting the presence or absence of the power receiving device.