Power transmitter device, program, control method for power transmitter device, and power receiver device

Abstract

A power transmitter side control unit (70) of a power transmitter device (20) calculates an intensity value of a power supply request signal based on an output signal of a power transmitter side communication coil (40).　 The power transmitter side control unit (70) energizes a power transmitter coil (22) on condition that it is determined that the calculated intensity value exceeds a determination threshold.　 When a driving speed of a vehicle (11) to which power is supplied in a wireless manner from the power transmitter coil (22) is low, the power transmitter side control unit (70) sets the determination threshold to be larger than when the driving speed is high.

Description

POWER TRANSMITTER DEVICE, PROGRAM, CONTROL METHOD FOR POWER TRANSMITTER DEVICE, AND POWER RECEIVER DEVICECross Reference

[0001] This application is based on Japanese Application No. 2024-208006 filed on November 29, 2024, the contents of which are incorporated herein by reference.

[0002] The present disclosure relates to a power transmitter device, a program, a control method for a power transmitter device, and a power receiver device.

[0003] A system for wireless power supply from a power transmitter device on the ground side to a power receiver device mounted on an electric vehicle while the vehicle is parked is disclosed.　 In order to appropriately supply power in a wireless manner from a power transmitter coil of the power transmitter device to a power receiver coil of the power receiver device, the relative positional relationship between the power transmitter coil and the power receiver coil is required to be an appropriate positional relationship.　 Patent Literature 1 describes an automatic parking assistance control for adjusting the relative positional relationship between the power transmitter coil and the power receiver coil to an appropriate positional relationship.

[0004] JP2021-154837A

[0005] When power is supplied in a wireless manner from the power transmitter coil to the power receiver coil, this can have an effect on metal objects constituting the vehicle (for example, iron parts around the wheels and other suspension parts).　 Here, when the driving speed of the vehicle is low, such as when the vehicle is parked at an intersection with a traffic light (for example, a red light) displaying a stop signal, a bus stop, or a taxi pool, the effect of wireless power supply on metal objects constituting the vehicle continues for a longer period of time than when the driving speed of the vehicle is high.　 For this reason, a technique is desired that reduces the effect of wireless power supply on metal objects constituting the vehicle when the vehicle's driving speed is low.　 This technique is also desirable when the power transmitter device is a vehicle-side device and the power receiver device is a device on the ground side.

[0006] A primary object of the present disclosure is to provide a power transmitter device, a program, a control method for a power transmitter device, and a power receiver device that can reduce the effect of wireless power supply on metal objects constituting a vehicle when the driving speed of the vehicle is low.

[0007] A first disclosure is a power transmitter device to be applied to a wireless power supply system in which one of devices on a ground side and a vehicle side is the power transmitter device including a power transmitter antenna, and another device is a power receiver device including a power receiver antenna.　 The power receiver device is configured to transmit a power supply request signal to request power supply to the power transmitter device. 　The power transmitter device is configured to supply power to the power receiver antenna in a wireless manner by energizing the power transmitter antenna on condition that the power transmitter device receives the power supply request signal, the power transmitter device configured to receive the power supply request signal transmitted wirelessly from a power receiver side communication antenna in the power receiver device by a power transmitter side communication antenna. 　The power transmitter comprises: a power transmitter side control unit configured to control energization of the power transmitter antenna to supply power to the power receiver antenna in a wireless manner.　 The power transmitter side control unit is configured to calculate an intensity value of the power supply request signal based on a received signal of the power transmitter side communication antenna, energize the power transmitter antenna on condition that the calculated intensity value is determined to exceed a determination threshold, and perform threshold setting processing to set the determination threshold to be larger when a driving speed of the vehicle is low, compared to when the driving speed is high.

[0008] Therefore, when the driving speed of the vehicle is low, a power transmitter antenna is less likely to be energized than when the driving speed of the vehicle is high.　 Therefore, according to a first disclosure, when the driving speed of the vehicle is low, the effect of wireless power supply on metal objects constituting the vehicle can be reduced.

[0009] A second disclosure a power receiver device to be applied to a wireless power supply system in which one of devices on a ground side and a vehicle side is a power transmitter device including a power transmitter antenna, and another device is the power receiver device including a power receiver antenna.　 The power receiver device is configured to transmit a power supply request signal to request power supply to the power transmitter device.　 The power transmitter device is configured to supply power to the power receiver antenna in a wireless manner by energizing the power transmitter antenna on condition that the power transmitter device receives the power supply request signal.　 The power receiver device comprises: a power receiver side communication antenna configured to perform wireless communication with a power transmitter side communication antenna provided to the power transmitter device; and a power receiver side control unit configured to control energization of the power receiver antenna and the power receiver side communication antenna.　 The power receiver side control unit is configured to calculate an intensity value of a transmission signal contained in a received signal of the power receiver side communication antenna based on the received signal, supply the power supply request signal to the power receiver side communication antenna on condition that the calculated intensity value is determined to exceed an intensity threshold, and set the intensity threshold to be larger when a driving speed of the vehicle is low, compared to when the driving speed is high.

[0010] Therefore, when the driving speed of the vehicle is low, a power supply request signal is less likely to be transmitted and the power transmitter antenna is less likely to be energized than when the driving speed of the vehicle is high.　 Therefore, according to a second disclosure, when the driving speed of the vehicle is low, the effect of wireless power supply on metal objects constituting the vehicle can be reduced.

[0011] The drawings described herein are intended to illustrate selected embodiments, do not depict all possible embodiments, and are not intended to limit the scope of the present disclosure.

[0012] FIG. 1 is an overall configuration diagram of a wireless power supply system according to a first embodiment.FIG 2 is an overall configuration diagram of the wireless power supply system.FIG. 3 shows a power transmitter device and a power receiver device.FIG. 4 is a diagram showing a configuration of wide-area wireless communication between the power transmitter device and a vehicle.FIG. 5 is a diagram showing a power receiver side control unit and a peripheral configuration thereof.FIG. 6 is a diagram showing a power transmitter side control unit and a peripheral configuration thereof.FIG. 7 is a flowchart showing energization control processing of a power transmitter coil.FIG. 8 is a flowchart showing energization control processing of a power transmitter coil according to a second embodiment.FIG. 9 is a flowchart showing energization control processing of a power transmitter coil according to a third embodiment.FIG. 10 is a flowchart showing processing of a power transmitter side control unit and a power receiver side control unit according to a fourth embodiment.

[0013] A plurality of embodiments will be described with reference to drawings.　 In the plurality of embodiments, functionally and / or structurally corresponding and / or related portions may be labeled with the same reference numerals or with reference numerals that differ in the hundredth or higher digits.　 For corresponding and / or associated portions, reference may be made to the description of other embodiments.

[0014] <First Embodiment> A first embodiment of a wireless power supply system according to the present disclosure will be described below with reference to drawings.

[0015] First, the overall configuration of the wireless power supply system will be described.　 As shown in FIGS. 1, 2 and 3, a wireless power supply system 10 includes a power transmitter device 20 and a power receiver device 100.　 The power receiver device 100 is a device on the vehicle side, which is mounted on a vehicle 11, as a moving object driving on a road RS.　 The vehicle 11 is, for example, an electric vehicle or a hybrid vehicle.　 While the vehicle 11 is driving or stopped, power is supplied from the power transmitter device 20 to the power receiver device 100.　 The wireless power supply system 10 performs wireless power transmission from the power transmitter device 20 to the power receiver device 100 by magnetic field resonant coupling (magnetic field resonance).　 The wireless power supply system 10 is also called a dynamic wireless power transfer (D-WPT) system.

[0016] The power transmitter device 20 is a device on the ground side including a power transmitter side coil unit 21 and a power transmitter side power source unit 51 that supplies power to the power transmitter side coil unit 21.　 The power transmitter device 20 is, for example, a stationary device.　 The power transmitter side coil unit 21 is installed (for example, buried) on the road RS, a parking lot, or the like.　 The power transmitter side power source unit 51 is installed, for example, at the side of the road RS.　 The power transmitter side coil unit 21 is connected to a power transmitter side power source unit 51.　 The power transmitter side power source unit 51 is connected to an AC power source 15 and supplies AC power from the AC power source 15 to the power transmitter side coil unit 21.　 The AC power source 15 is, for example, a commercial power source.　 A plurality of power transmitter side coil units 21 are disposed along the lanes of the road RS.　 FIG. 2 shows an example in which four power transmitter side coil units 21 disposed side by side along the road RS are connected to one power transmitter side power source unit 51.　 In other words, one power transmitter side power source unit 51 is provided for each of the four power transmitter side coil units 21.　 The configuration is not limited to one power transmitter side power source unit 51 being provided for each of the plurality of power transmitter side coil units 21, but may also be one power transmitter side power source unit 51 being provided for one power transmitter side coil unit 21.

[0017] The power transmitter side power source unit 51 includes a PFC circuit 61, an inverter 60, and a filter circuit 52.　 The PFC circuit 61 includes an AC / DC converter and is connected to the AC power source 15.　 The switching of the switching elements (for example, IGBTs or MOSFETs) included in the PFC circuit 61 is controlled so that the power factor of the AC power input from the AC power source 15 is improved and the input AC power is converted into DC power.

[0018] The inverter 60 is connected to the PFC circuit 61.　 The DC power input from the PFC circuit 61 is converted into AC power by controlling the switching of the switching elements (for example, IGBTs or MOSFETs) included in the inverter 60.

[0019] The filter circuit 52 removes noise contained in the AC current input from the inverter 60, and supplies the AC current from which the noise has been removed to the power transmitter side coil unit 21.　 The filter circuit 52 is, for example, an LC filter including a coil and a capacitor.　 As the filter circuit 52, circuits of various configurations are used, specifically, for example, a T-type filter circuit is used.

[0020] The power transmitter side coil unit 21 includes a power transmitter coil 22 (corresponding to a "power transmitter antenna"), a power transmitter side resonant circuit 30, and a power transmitter side communication coil 40.　 The power transmitter side resonant circuit 30 supplies the AC power supplied from the filter circuit 52 to the power transmitter coil 22.　 As the power transmitter side resonant circuit 30, various well-known resonant circuits such as a circuit including a resonant capacitor can be used.

[0021] The power receiver device 100 includes a power receiver side coil unit 101 and a power receiver side power source unit 181.　 The power receiver side coil unit 101 includes a power receiver coil 102 (corresponding to a "power receiver antenna").　 The power receiver side coil unit 101 is provided at the bottom of the vehicle body of the vehicle 11.　 The power receiver side coil unit 101 is provided at the bottom of the vehicle body to face the ground surface.　 When the vehicle 11 drives on the road RS in which the power transmitter coil 22 is buried, the power transmitter coil 22 on the ground side and the power receiver coil 102 provided on the vehicle 11 face each other in a vertical direction.

[0022] The power receiver device 100 includes a power receiver side resonant circuit 140.　 The power receiver coil 102 is connected to the power receiver side resonant circuit 140.　 Power is transmitted to the power receiver coil 102 from the power transmitter coil 22.　 The power receiver coil 102 supplies the received power to the power receiver side resonant circuit 140.　 As the power receiver side resonant circuit 140, various well-known resonant circuits such as a circuit including a resonant capacitor can be used.

[0023] The power receiver device 100 includes a filter circuit 182, a rectifier circuit 200 that functions as a DC / AC convertor circuit, and a smoothing capacitor 210.　 The filter circuit 182 removes noise contained in the AC current input from the power receiver side resonant circuit 140, and supplies the AC current from which the noise has been removed to the rectifier circuit 200.　 The filter circuit 182 of the present embodiment is, for example, an LC filter including a reactor and a capacitor.

[0024] The rectifier circuit 200 converts the input AC current into a DC current and outputs the DC current.　 The rectifier circuit 200 is, for example, a full-bridge circuit including semiconductor switching elements, or a diode rectifier circuit.　 A first end of the smoothing capacitor 210 is connected to a high potential side output terminal of the rectifier circuit 200.　 A second end of the smoothing capacitor 210 is connected to the low potential side output terminal of the rectifier circuit 200.　 The rectifier circuit 200 is also called an electronic rectification box (ERB).

[0025] The vehicle 11 includes a high-potential side main switch 301H, a low-potential side main switch 301L, and a high-voltage power storage battery 300 as a power storage unit.　 The high-potential side main switch 301H and the low-potential side main switch 301L are, for example, relays (specifically, mechanical relays).　 The high potential side output terminal of the rectifier circuit 200 is connected to the positive-electrode terminal of the high-voltage power storage battery 300 via the high-potential side main switch 301H.　 The low potential side output terminal of the rectifier circuit 200 is connected to the negative-electrode terminal of the high-voltage power storage battery 300 via the low-potential side main switch 301L.　 The high-voltage power storage battery 300 is a secondary battery that can be charged and discharged, and has a rated voltage of, for example, several hundred volts.　 The high-voltage power storage battery 300 is, for example, a lithium-ion power storage battery or a nickel-metal hydride power storage battery.

[0026] The vehicle 11 includes a driving inverter 310 and a rotating electric machine 320.　 The driving inverter 310 is a three-phase inverter, and is connected to the high-voltage power storage battery 300 via the high-potential side main switch 301H and the low-potential side main switch 301L.　 An armature winding of the rotating electric machine 320 is connected to the upper and lower arm switches constituting the driving inverter 310.　 With the high-potential side main switch 301H and the low-potential side main switch 301L turned on, the switching of the upper and lower arm switches of the driving inverter 310 is controlled such that the driving inverter 310 converts the DC power supplied from the high-voltage power storage battery 300 into AC power and supplies the AC power to the armature winding.　 This causes the rotor of the rotating electric machine 320 to rotate, and the drive wheels of the vehicle 11 are rotated by the rotational power of the rotor.　 As a result, the vehicle 11 drives.

[0027] As shown in FIG. 3, the power transmitter side power source unit 51 constituting the power transmitter device 20 includes a power transmitter side control unit 70.　 The power transmitter side control unit 70 includes a power transmitter side controller 71.　 The power transmitter side controller 71 is an electronic control unit (ECU) that performs various controls of the power transmitter device 20, and includes a processor as hardware, a storage unit, and a communication bus that connects the processor and the storage unit.

[0028] The storage unit includes memory and storage as hardware.　 The memory is a storage device for storing data used in the processing of the power transmitter side controller 71.　 The memory provides the processor with, for example, a working area for temporary use when the processor performs processing.　 The memory includes, for example, a ROM or a RAM.　 The storage is a storage device that stores various programs and data to be read and executed by the processor, and is a non-transitory tangible storage medium.　 The storage includes, for example, a HDD or a flash memory.　 The storage stores program information and the like for the processing described below.

[0029] The power receiver side power source unit 181 constituting the power receiver device 100 includes a power receiver side controller 231.　 The power receiver side controller 231 is an ECU that performs various controls of the power receiver device 100, and includes a processor as hardware, a storage unit, and a communication bus that connects the processor and the storage unit.

[0030] The storage unit includes memory and storage as hardware.　 The memory is a storage device for storing data used in the processing of the power receiver side controller 231.　 The memory provides the processor with, for example, a working area for temporary use when the processor performs processing.　 The memory includes, for example, a ROM or a RAM.　 The storage is a storage device that stores various programs and data to be read and executed by the processor, and is a non-transitory tangible storage medium.　 The storage includes, for example, a HDD or a flash memory.　 The storage stores program information and the like for the processing described below.

[0031] For example, program information stored in a non-transitory tangible storage medium is installed in the storage units of the power receiver side controller 231 and the power transmitter side controller 71.　 The storage medium is, for example, a USB memory, a CD-ROM, or a DVD.　 Furthermore, for example, program information transmitted via a communication network, such as over the air (OTA), is installed in the storage unit 233.

[0032] The power transmitter side controller 71 performs switching control of the PFC circuit 61 and switching control of the inverter 60.　 A high-frequency AC voltage is applied to the power transmitter coil 22 by controlling the switching of the inverter 60.　 Therefore, a high-frequency current flows through the power transmitter coil 22, and a magnetic field for power transmission is generated in the power transmitter coil 22.

[0033] In the present embodiment, the power transmitter side controller 71 controls the switching of the inverter 60 so that the frequency of the high-frequency voltage applied to the power transmitter coil 22 becomes a first specified frequency (specifically, 85 kHz) that is equal to or higher than 10 kHz and equal to or less than 100 GHz.　 The resonance frequencies of the power transmitter side resonant circuit 30 and the power receiver side resonant circuit 140 are set to the same frequency as the first specified frequency or to a frequency close to the first specified frequency.

[0034] When the magnetic field generated in the power transmitter coil 22 interlinks with the power receiver coil 102 of the vehicle 11, a high-frequency current that fluctuates with the frequency of the high-frequency current flowing through the power transmitter coil 22 flows through the power receiver coil 102.　 The high-frequency current flowing through the power receiver coil 102 is supplied to the rectifier circuit 200 via the power receiver side resonant circuit 140 and the filter circuit 182.　 The rectifier circuit 200 converts the supplied AC current into a DC current and outputs the DC current.　 When the high-potential side main switch 301H and the low-potential side main switch 301L are turned on, the output current of the rectifier circuit 200 is supplied to the high-voltage power storage battery 300 and the driving inverter 310.

[0035] The vehicle 11 includes a low-voltage power storage battery 302.　 The rated voltage of the low-voltage power storage battery 302 is lower than the rated voltage of the high-voltage power storage battery 300.　 The low-voltage power storage battery 302 is, for example, a lead power storage battery.　 When power is supplied from the low-voltage power storage battery 302 to the power receiver side controller 231, the power receiver side controller 231 becomes operable.

[0036] The power receiver device 100 and the power transmitter device 20 have a configuration for communication between the power receiver device 100 and the power transmitter device 20.　 In detail, the power receiver side coil unit 101 constituting the power receiver device 100 includes a power receiver side communication coil 170 (corresponding to a "power receiver side communication antenna").　 The power receiver side control unit 230 includes a transmitter 240.

[0037] The power transmitter side coil unit 21 constituting the power transmitter device 20 includes the power transmitter side communication coil 40 (corresponding to a "power transmitter side communication antenna").　 The power transmitter side control unit 70 includes a receiver 80.　 The power receiver side communication coil 170 and the power transmitter side communication coil 40 are communication coils for performing short-range wireless communication.　 The short-range wireless communication is communication with a communication distance of less than 10 meters (for example, a maximum of about 3 meters).　 The short-range wireless communication has a shorter communication distance than wide-area wireless communication.

[0038] As the short-range wireless communication, various near field communication methods can be used, and for example, communication conforming to any communication standard established by IEEE, ISO, IEC, or the like is used.　 Specifically, for example, Wi-Fi (registered trademark), Bluetooth (registered trademark), ZigBee (registered trademark), radio frequency identification (RFID), or dedicated short range communication (DSRC) is used as the short-range wireless communication.

[0039] The transmitter 240 is connected to the power receiver side controller 231.　 The power receiver side communication coil 170 is connected to the transmitter 240.　 The power receiver side controller 231 controls the transmitter 240 to supply a power supply request signal COMM to the power receiver side communication coil 170.　 The power supply request signal COMM is a signal that requests the power transmitter coil 22 near the vehicle 11 to transmit power to the power receiver coil 102.

[0040] The power receiver side control unit 230 controls the transmitter 240 in order to supply the power supply request signal COMM and information including the driving speed of the vehicle 11 to the power receiver side communication coil 170 in one frame.　 In the present embodiment, the power supply request signal includes ID information of the vehicle 11 and requested power Weq, which is a requested value of power to be supplied to the vehicle 11.　 This control causes the transmitter 240 to apply a high-frequency voltage to the power receiver side communication coil 170.　 Therefore, a high-frequency current flows through the power receiver side communication coil 170, and a magnetic field for information communication is generated in the power receiver side communication coil 170.

[0041] In the case where the power receiver side coil unit 101 of the vehicle 11 is close to the power transmitter side coil unit 21 on the ground side, when the generated magnetic field interlinks with the power transmitter side communication coil 40, a high-frequency current flows in the power transmitter side communication coil 40.　 This high-frequency current is input to the receiver 80.　 The receiver 80 recognizes the presence or absence of a power supply request and the ID information based on the input signal from the power transmitter side communication coil 40.　 The receiver 80 acquires the requested power Weq of the vehicle 11 having the recognized ID information based on the signal from the power transmitter side communication coil 40.　 The information recognized by the receiver 80 and the requested power Weq are input to the power transmitter side controller 71.

[0042] In the present embodiment, the power receiver side controller 231 controls the transmitter 240 so that the frequency of the high-frequency voltage applied to the power receiver side communication coil 170 becomes a second specified frequency that is equal to or higher than 10 kHz and equal to or lower than 100 GHz.　 In the present embodiment, the second specified frequency is a frequency that is shifted from the first specified frequency, and specifically, is a frequency that is higher than the first specified frequency (specifically, 13.56 MHz).

[0043] The power transmitter side controller 71 determines whether to energize the power transmitter coil 22 based on an input signal from the receiver 80.　 In detail, on condition that it is determined that there is a power supply request based on an input signal from the receiver 80, the power transmitter side controller 71 applies a high-frequency voltage to the power transmitter coil 22 by controlling the switching of the inverter 60 and the PFC circuit 61.　 Therefore, power is transmitted in a wireless manner from the power transmitter coil 22 to the power receiver coil 102.

[0044] FIG. 4 is a schematic diagram for illustrating wide-area wireless communication in the wireless power supply system 10.　 In the wireless power supply system 10, each vehicle 11 is capable of communicating with each power transmitter device 20 via a communication network 16.　 The communication network 16 includes, for example, a wide-area network (WAN), which is a public communication network such as the Internet, a telephone communication network for mobile phones, an information and communication network for ETC, and an information and communication network for the vehicle information and communication system (VICS (registered trademark)).　 The wide-area wireless communication is communication with a communication distance of, for example, 10 meters to 10 kilometers.　 The wide-area wireless communication has a longer communication distance than short-area wireless communication.　 Examples of wide-area wireless communication that can be used include 3GPP (registered trademark), 4G, LTE, 5G, and WiMAX (registered trademark) developed by IEEE.

[0045] The vehicle 11 includes a position sensor 330, a navigation device 331, and a communication unit 332.　 The position sensor 330 is a sensor that detects the current position of the vehicle, and is, for example, a GPS sensor. 　The storage unit (for example, storage) of the navigation device 331 stores map information including road information.　 The navigation device 331 receives information on the current position of the vehicle detected by the position sensor 330 and weather information.　 The power transmitter side control unit 70 of the power transmitter device 20 includes a communication unit 90.　 The communication unit 332 of the vehicle 11 and the communication unit 90 of the power transmitter side control unit 70 perform wide-area wireless communication via the communication network 16.

[0046] The transmitter 240 and the peripheral configuration thereof will be described with reference to FIG. 5.

[0047] The transmitter 240 includes a generator circuit 241 and a power receiver side amplifier 242.　 The generator circuit 241 is connected to the power receiver side controller 231 and the power receiver side amplifier 242.　 The generator circuit 241 generates a vehicle-side signal, which is a high-frequency signal including a power supply request signal, based on a command from the power receiver side controller 231.　 The frequency of the vehicle-side signal is the second specified frequency.　 The power receiver side amplifier 242 amplifies the high-frequency signal generated by the generator circuit 241 and supplies the amplified signal to the power receiver side communication coil 170.

[0048] The power receiver side controller 231 instructs the generator circuit 241 to generate a vehicle-side signal.　 The high-frequency signal output from the generator circuit 241 is amplified by the power receiver side amplifier 242.　 The amplified signal is supplied to the power receiver side communication coil 170.

[0049] Next, the receiver 80 and the peripheral configuration thereof will be described with reference to FIG. 6.

[0050] The receiver 80 includes a power transmitter side amplifier 81, a wave detector circuit 82, and a determination circuit 83.　 The power transmitter side amplifier 81 amplifies the high-frequency signal (high-frequency current or voltage signal) output from the power transmitter side communication coil 40 and supplies the amplified signal to the wave detector circuit 82.　 The high-frequency signal output from the power transmitter side communication coil 40 contains a frequency component that fluctuates at the second specified frequency.

[0051] The wave detector circuit 82 detects the high-frequency signal input from the power transmitter side amplifier 81 to calculate an intensity value Intd that is the amplitude or effective value of the input power supply request signal.　 The calculated intensity value Intd is input to the determination circuit 83.

[0052] The determination circuit 83 determines whether there is a power supply request to the power transmitter coil 22 based on the input intensity value Intd.　 In detail, when it is determined that the intensity value Intd exceeds a determination threshold Ijde, the determination circuit 83 determines that there is a power supply request.　 On the other hand, when it is determined that the intensity value Intd is lower than the determination threshold Ijde, the determination circuit 83 determines that there is no power supply request.　 The determination result information of the determination circuit 83 is input to the power transmitter side controller 71.

[0053] When it is determined that there is no power supply request based on the input determination result information, the power transmitter side controller 71 stops switching control of the PFC circuit 61 and the inverter 60.　 Therefore, the switches of the PFC circuit 61 and the inverter 60 are kept off, and the power transmitter coil 22 is not energized.

[0054] On the other hand, when it is determined that there is a power supply request based on the input determination result information, the power transmitter side controller 71 applies a high-frequency voltage to the power transmitter coil 22 by performing switching control of the PFC circuit 61 and the inverter 60.　 Therefore, a high-frequency current flows through the power transmitter coil 22.　 In this case, power is supplied in a wireless manner from the power transmitter coil 22 to the power receiver coil 102 that faces the power transmitter coil 22 in the vertical direction.　 When it is determined that there is a power supply request, the power transmitter side controller 71 actually performs coupling determination processing to determine whether the degree of magnetic coupling between the power receiver coil 102 and the power transmitter coil 22 is appropriate for power transmission, prior to executing switching control of the inverter 60 and the PFC circuit 61.　 The power transmitter side controller 71 executes switching control of the inverter 60 and the PFC circuit 61 on condition that it is determined that the degree of magnetic coupling between the power receiver coil 102 and the power transmitter coil 22 is appropriate.　 Therefore, current is applied to the power transmitter coil 22 while the power receiver coil 102 and the power transmitter coil 22 are in close proximity to each other.

[0055] However, when power is supplied in a wireless manner from the power transmitter coil 22 to the power receiver coil 102, this may affect metal objects constituting the vehicle or metal objects present around the vehicle.　 In detail, a magnetic field generated when the power transmitter coil 22 is energized may inductively heat the metal objects.

[0056] When the driving speed of the vehicle is low, such as when the vehicle is parked at an intersection with a traffic light (for example, a red light) displaying a stop signal, a bus stop, or a taxi pool, the effect of wireless power supply on the metal objects continues for a longer period of time than when the driving speed of the vehicle is high.　 In order to address this problem, the power transmitter side control unit 70 performs threshold setting processing of setting the determination threshold Ijde to a value larger when the driving speed of the vehicle is low than when the driving speed of the vehicle is high.

[0057] FIG. 7 is a flowchart of energization control processing of the power transmitter coil 22 executed by the power transmitter side control unit 70.

[0058] In step S10, the power transmitter side amplifier 81 of the receiver 80 amplifies the high-frequency signal received by the power transmitter side communication coil 40 and inputs the amplified signal to the wave detector circuit 82.

[0059] In step S11, the wave detector circuit 82 calculates the intensity value Intd of the power supply request signal based on the input signal from the power transmitter side amplifier 81.　 The wave detector circuit 82 acquires vehicle ID information based on the input signal from the power transmitter side amplifier 81.

[0060] In step S12, the wave detector circuit 82 acquires information on a driving speed Vsp of the vehicle 11 based on the input signal from the power transmitter side amplifier 81.　 That is, the power transmitter side control unit 70 acquires information on the driving speed Vsp by using short-range wireless communication with the vehicle 11.

[0061] The power transmitter side control unit 70 may acquire information on the driving speed Vsp based on the duration of the short-range wireless communication.　 For example, the power transmitter side control unit 70 may count the duration of current flow through the power transmitter side communication coil 40 as the duration of the short-range wireless communication, and determine that the driving speed is lower as the counted duration is longer.

[0062] The power transmitter side control unit 70 may count the duration of energization of the power transmitter coil 22 instead of the duration of short-range wireless communication, and determine that the driving speed is lower as the counted duration of energization is longer.

[0063] The power transmitter side control unit 70 may acquire information on the driving speed Vsp by using wide-area wireless communication instead of short-range wireless communication.　 In detail, the power transmitter side control unit 70 receives the information on the driving speed and the vehicle ID information transmitted from the communication unit 332 of the vehicle 11 via the communication unit 90 of the power transmitter device 20.　 When the vehicle ID information acquired in step S10 matches the ID information received by the communication unit 90, the power transmitter side control unit 70 may use the driving speed received by the communication unit 90 in the processing of steps S13 and S15.　 The power transmitter side control unit 70 may also acquire information on the driving speed Vsp based on a detected signal of a position change sensor (not shown) included in the power transmitter device 20 (for example, the power transmitter side coil unit 21).　 The position change sensor is a sensor that detects a change in the vehicle position above the power transmitter side coil unit 21.

[0064] The driving speed Vsp can be measured by either the power transmitter side coil unit 21 or the power receiver side coil unit 101 by using magnetic flux related positioning technologies, or unrelated positioning technologies such as the vehicle's egomotion, GPS and other sensors on the power receiver side coil unit 101 can be used.　 The driving speed Vsp can be acquired via a CAN bus.　 It is preferable that the positioning technique is implemented only in the power receiver side coil unit 101, for example, not in the power transmitter side coil unit 21.

[0065] In step S13, the determination circuit 83 determines whether the required time for the driving speed of the vehicle 11 to reach zero when the vehicle 11 is decelerating is longer than a predetermined time.　 The determination circuit 83 may predict the required time based on, for example, traffic information around the vehicle 11 acquired by road-to-vehicle communication, current position information of the vehicle 11 received by wide-area wireless communication, driving speed information of the vehicle 11, and road information.

[0066] When it is determined in step S13 that the required time is shorter than the predetermined time, the process proceeds to step S14, where the determination circuit 83 sets the determination threshold Ijde to a high-level threshold IH (corresponding to an "upper limit threshold").　 The determination circuit 83 sets the determination threshold Ijde to the high-level threshold IH even when the driving speed Vsp is zero.

[0067] When it is determined in step S13 that the required time is equal to or shorter than the predetermined time, the process proceeds to step S15, where the determination circuit 83 determines whether the acquired driving speed Vsp is lower than a determination speed Vsth.　 The determination speed Vsth is set from the viewpoint of preventing a temperature rise in metal objects around the vehicle receiving magnetic flux from the power transmitter coil 22 or parts of the vehicle receiving magnetic flux from the power transmitter coil 22, and is set to a single value of 2 km / h or more and 20 km / h or less.　 For example, the determination speed Vsth is set to "2 km / h ≦ Vsth ≦ 16 km / h", "2 km / h ≦ Vsth ≦ 10 km / h", "2 km / h ≦ Vsth ≦ 8 km / h", or "2 km / h ≦ Vsth ≦ 5 km / h".　 The determination speed Vsth is not a single value, but should be a value within a range of, for example, 5 km / h to 10 km / h.

[0068] When it is determined that the driving speed Vsp is lower than the determination speed Vsth, the process proceeds to step S16, where the determination circuit 83 sets the determination threshold Ijde to a medium-level threshold IM.　 The medium-level threshold IM is a value smaller than the high-level threshold IH.

[0069] When it is determined that the driving speed Vsp is equal to or higher than the determination speed Vsth, the process proceeds to step S17, where the determination circuit 83 sets the determination threshold Ijde to a low-level threshold IL.　 The low-level threshold IL is a value smaller than the medium-level threshold IM.

[0070] In step S18, the determination circuit 83 determines whether the intensity value Intd calculated in step S11 exceeds the determination threshold Ijde set in step S14, S16, or S17.

[0071] When it is determined that the intensity value Intd exceeds the determination threshold Ijde, the determination circuit 83 inputs, to the power transmitter side controller 71, determination result information indicating that there is a power supply request.　 In step S19, the power transmitter side controller 71 determines that there is a power supply request based on the input determination result information, and performs switching control of the PFC circuit 61 and the inverter 60 in order to energize the power transmitter coil 22.

[0072] On the other hand, when it is determined that the intensity value Intd is lower than the determination threshold Ijde, the determination circuit 83 inputs, to the power transmitter side controller 71, determination result information indicating that there is no power supply request.　 The power transmitter side controller 71 determines that there is no power supply request based on the input determination result information, and stops the switching control of the PFC circuit 61 and the inverter 60, and keeps the switches of the PFC circuit 61 and the inverter 60 off in order to stop the energization of the power transmitter coil 22.

[0073] According to the present embodiment described above, the following effects are obtained.

[0074] When it is determined that the vehicle is driving and the driving speed Vsp is lower than the determination speed Vsth, the power transmitter side control unit 70 sets the determination threshold Ijde to be larger than when the driving speed Vsp is equal to or higher than the determination speed Vsth.　 In detail, as shown in steps S15 to S17 in FIG. 7, the power transmitter side control unit 70 sets the determination threshold Ijde to be larger stepwise as the driving speed Vsp is lower, specifically, in two steps.　 Therefore, when the vehicle 11 decelerates to a speed of zero or near zero, the determination threshold Ijde gradually increases.　 As a result, when the vehicle is driving at an extremely low speed, it will be difficult for the power transmitter coil 22 to be energized. 　Therefore, it is possible to reduce the effect of wireless power supply on metal objects around the vehicle.　 According to the present embodiment, when the vehicle 11 accelerates from a speed of zero or near zero, the determination threshold Ijde gradually decreases.　 This enables a smooth transition from a stage where the effect of wireless power supply on metal objects is reduced to a stage where power can be supplied in a wireless manner while driving.　 The power transmitter side control unit 70 may increase the determination threshold Ijde continuously, rather than stepwise, as the driving speed Vsp decreases.

[0075] When the driving speed Vsp is zero, the power transmitter side control unit 70 sets the determination threshold Ijde to the high-level threshold IH.　 When the vehicle 11 decelerates, the power transmitter side control unit 70 predicts whether the required time for the driving speed to reach zero is longer than a predetermined time, and when it is predicted that the required time is longer than the predetermined time, the power transmitter side control unit 70 sets the determination threshold Ijde to a value that is smaller than the high-level threshold IH and that is larger as the driving speed Vsp decelerates.　 When it is predicted that the required time is shorter than the predetermined time, the power transmitter side control unit 70 sets the determination threshold Ijde to the high-level threshold IH.

[0076] For example, when the vehicle 11 is decelerating because the traffic light in front of the vehicle 11 is a stop signal (red light), it is considered that the required time for the driving speed of the vehicle 11 to reach zero will be relatively short.　 In this case, in anticipation of the vehicle 11 being stopped in the near future, priority is given to reducing the effect of the magnetic field from the power transmitter coil 22.　 On the other hand, when the vehicle 11 is decelerating due to low-speed traffic congestion in front of the vehicle 11, it is considered that the required time for the driving speed of the vehicle 11 to reach zero will be relatively long.　 In this case, in anticipation of the vehicle 11 continuing to drive at a low speed, priority is given to executing wireless power supply.

[0077] <Second Embodiment> Hereinafter, a second embodiment will be described with reference to drawings, focusing on differences from the first embodiment.　 In the present embodiment, the power transmitter side control unit 70 reduces the reception sensitivity of the power transmitter side communication coil 40 as the driving speed Vsp decreases.

[0078] FIG. 8 is a flowchart of energization control processing of the power transmitter coil 22 executed by the power transmitter side control unit 70.

[0079] In step S21, the power transmitter side controller 71 reduces the gain of the power transmitter side amplifier 81 and reduces the reception sensitivity of the power transmitter side communication coil 40 as the driving speed Vsp acquired in step S12 decreases.　 The lower the reception sensitivity is, the smaller the intensity of the power supply request signal received by the power transmitter side communication coil 40 is.　 Therefore, according to the processing in step S21, the lower the driving speed Vsp is, the less likely the power transmitter coil 22 will be energized.　 Therefore, it is possible to reduce the effect of wireless power supply on metal objects around the vehicle.

[0080] <Third Embodiment> Hereinafter, a third embodiment will be described with reference to drawings, focusing on differences from the first embodiment.　 In the present embodiment, the power transmitter side control unit 70 acquires power storage capacity information on the power storage capacity of the high-voltage power storage battery 300, and performs threshold setting processing on condition that the acquired power storage capacity of the high-voltage power storage battery 300 is equal to or higher than a predetermined value.

[0081] FIG. 9 is a flowchart of energization control processing of the power transmitter coil 22 executed by the power transmitter side control unit 70.

[0082] After completing the process of step S12, the process proceeds to step S22, where the power transmitter side controller 71 acquires power storage capacity information on the power storage capacity of the high-voltage power storage battery 300.　 The power storage capacity information is, for example, the state of charge (SOC) of the high-voltage power storage battery 300 or the terminal voltage (for example, the open circuit voltage) of the high-voltage power storage battery 300.　 The power transmitter side controller 71 may acquire the power storage capacity information by using, for example, the above-mentioned short-range wireless communication or wide-area wireless communication.

[0083] The power transmitter side controller 71 determines whether the acquired power storage capacity is equal to or higher than a predetermined value K.　 When the power transmitter side controller 71 determines that the power storage capacity is equal to or higher than the predetermined value K, the process proceeds to step S13.　 On the other hand, when it is determined that the power storage capacity is less than the predetermined value K, the process proceeds to step S17, where the power transmitter side controller 71 sets the determination threshold Ijde to the low-level threshold IL, which is a default value.

[0084] When the power storage capacity of the high-voltage power storage battery 300 is less than the predetermined value K, it is desirable to reliably supply power to the vehicle 11 in a wireless manner.　 According to the present embodiment, when the high-voltage power storage battery 300 has a low SOC, it is possible to give priority to the execution of wireless power supply.

[0085] <Modification Example of Third Embodiment> The processing of step S21 may be added to the processing of FIG. 8 of the second embodiment.

[0086] <Fourth Embodiment> Hereinafter, a fourth embodiment will be described with reference to drawings, focusing on differences from the first embodiment.

[0087] In the present embodiment, the power transmitter side control unit 70 has a function of controlling the energization of the power transmitter side communication coil 40.　 The power receiver side control unit 230 also has a function of controlling the energization of the power receiver coil 102.

[0088] FIG. 10 is a flowchart of the processing executed by the power transmitter side control unit 70 and the power receiver side control unit 230.

[0089] In step S30, the power transmitter side control unit 70 supplies the power transmitter side communication coil 40 with a transmission signal, which is a high-frequency signal.　 The frequency of the transmission signal is, for example, the second specified frequency.

[0090] In step S40, the power receiver side control unit 230 calculates an intensity value Inp of the transmission signal based on the signal received by the power receiver side communication coil 170.

[0091] In step S41, when the driving speed of the vehicle 11 is low, the power receiver side control unit 230 sets the intensity threshold Ith to be larger than when the driving speed is high.　 Specifically, the power receiver side control unit 230 sets the intensity threshold Ith to be larger stepwise or continuously as the driving speed of the vehicle 11 is lower.

[0092] In step S42, the power receiver side control unit 230 determines whether the calculated intensity value Inp exceeds the intensity threshold Ith set in step S42.　 When it is determined that the intensity value Inp exceeds the intensity threshold Ith, the process proceeds to step S43, where the power receiver side control unit 230 supplies the vehicle-side signal including the power supply request signal to the power receiver side communication coil 170.　 On the other hand, when it is determined that the intensity value Inp is equal to or less than the intensity threshold Ith, the process proceeds to step S44, where the power receiver side control unit 230 stops supplying the vehicle-side signal to the power receiver side communication coil 170.

[0093] In step S31, the power transmitter side control unit 70 calculates the intensity value Intd of the power supply request signal, similarly to step S11.　 In step S32, the power transmitter side control unit 70 determines whether the calculated intensity value Intd exceeds the determination threshold Ijde, similarly to step S18.

[0094] When it is determined that the intensity value Intd exceeds the determination threshold Ijde, the process proceeds to step S33, where the power transmitter side control unit 70 performs switching control of the PFC circuit 61 and the inverter 60 in order to energize the power transmitter coil 22.　 On the other hand, when it is determined that the intensity value Intd is lower than the determination threshold Ijde, the process proceeds to step S34, where the power transmitter side control unit 70 stops the switching control of the PFC circuit 61 and the inverter 60, and keeps the switches of the PFC circuit 61 and the inverter 60 off in order to stop the energization of the power transmitter coil 22.

[0095] According to the present embodiment described above, when the driving speed of the vehicle 11 is low, a power supply request signal is less likely to be transmitted and the power transmitter coil 22 is less likely to be energized than when the driving speed is high.　 Therefore, according to the present embodiment, when the driving speed is low, the effect of the wireless power supply on the metal objects constituting the vehicle 11 can be reduced.

[0096] <Other Embodiments> The above embodiments may be changed and carried out as follows.

[0097] The wireless power supply system may have a second function of supplying power in a wireless manner from a vehicle-side device to a device on the ground side, in addition to a first function of supplying power in a wireless manner from a device on the ground side to a vehicle-side device.　 In this case, the power receiver device 100 on the vehicle side has a power transmitting function in addition to a power receiving function.　 The power transmitter device 20 on the ground side has a power receiving function in addition to a power transmitting function.　 The second function will be described below with reference to FIG. 3.

[0098] The power receiver side controller 231 applies a high-frequency AC voltage to the power receiver coil 102 by controlling the switching of the rectifier circuit 200.　 Therefore, a high-frequency current flows through the power receiver coil 102, and a magnetic field for power transmission is generated in the power receiver coil 102.

[0099] When the magnetic field generated in the power receiver coil 102 interlinks with the power transmitter coil 22, a high-frequency current that fluctuates with the frequency of the high-frequency current flowing through the power receiver coil 102 flows through the power transmitter coil 22.　 The high-frequency current flowing through the power transmitter coil 22 is supplied to the AC power source 15 via the power transmitter side resonant circuit 30, the filter circuit 52, the inverter 60, and the PFC circuit 61.　 In this case, the power transmitter side controller 71 controls the switching of the inverter 60 and the PFC circuit 61.

[0100] In the wireless power supply system having the second function, for example, the power transmitter device 20 may include a transmitter that supplies a power supply request signal to the power transmitter side communication coil 40.　 The power receiver device 100 may include a receiver that receives the power supply request signal received by the power receiver side communication coil 170 and inputs the signal to the power receiver side controller 231.

[0101] The wireless power supply system may have a function of supplying power in a wireless manner from a device on the vehicle side to a device on the ground side, instead of the function of supplying power in a wireless manner from a device on the ground side to a device on the vehicle side.

[0102] The power receiver side communication antenna and the power transmitter side communication antenna are not limited to communication coils, and various antennas may be used.　 For example, the communication antenna is a dipole antenna or a monopole antenna.

[0103] The method of wireless power transmission by the power transmitter antenna and the power receiver antenna is not limited to the magnetic field resonance method, and may be an electric field coupling method.　 In this case, a power transmitter antenna and a power receiver antenna that are different in form from coils and that use an electric field coupling method may be used.

[0104] The vehicle identification information used in the processing of the above embodiments is not limited to vehicle ID information, and may be, for example, a token or credit card information of a vehicle user.

[0105] The vehicle on which the power receiver device 100 is mounted is not limited to a vehicle that drives on the road RS, and may be, for example, an automated guided vehicle (AGV) or a driving robot.　 In this case, the power transmitter side coil unit 21 does not need to be buried in the road RS, but may be installed on a sidewalk adjacent to the road RS, in a parking lot, or on a route along which the AGV drives.

[0106] The control units and methods thereof described in the present disclosure may be implemented by a dedicated computer including a processor programmed to execute multiple functions embodied by a computer program and a memory.　 Alternatively, the control units and the methods thereof described in the present disclosure may be implemented by a dedicated computer including a processor with one or more dedicated hardware logic circuits.　 Alternatively, the control unit and the method described in the present disclosure may be implemented by one or more dedicated computers including a combination of a processor and a memory programmed to execute one or multiple functions and a processor including one or more hardware logic circuits.　 The computer program may be stored in a computer-readable non-transitory tangible storage medium, as an instruction executed by a computer.

[0107] The present disclosure is described based on the examples, and it is understood that the present disclosure is not limited to the examples or the structures.　 The present disclosure includes various modification examples and modifications within the equivalent scope.　 Although various combinations and forms are set forth in the present disclosure, other combinations and configurations, including only one element, more, or less, are also intended to fall within the scope and spirit of the present disclosure. As an example of the determination speed Vsth (speed threshold), other than a single value, the determination speed Vsth may be a value within a range of, for example, 5 km / h to 10 km / h.　 The speed of the vehicle may be measured with a sensor, which detects a magnetic flux, a GPS, and / or another sensor mounted on the vehicle.　 The measurement of the speed may be implemented by the power transmission device and / or may be implemented by the vehicle.　 The speed information may be transmitted via a CAN communication.　 The present disclosure may be implemented by the vehicle without the power transmission device.

Claims

1. A power transmitter device to be applied to a wireless power supply system in which one of devices on a ground side and a vehicle (11) side is the power transmitter device (20) including a power transmitter antenna (22), and another device is a power receiver device (100) including a power receiver antenna (102), the power receiver device configured to transmit a power supply request signal to request power supply to the power transmitter device, the power transmitter device configured to supply power to the power receiver antenna in a wireless manner by energizing the power transmitter antenna on condition that the power transmitter device receives the power supply request signal, the power transmitter device configured to receive the power supply request signal transmitted wirelessly from a power receiver side communication antenna (170) in the power receiver device by a power transmitter side communication antenna (40), 　　　　　　 the power transmitter device comprising: 　　　　　　 a power transmitter side control unit (70) configured to control energization of the power transmitter antenna to supply power to the power receiver antenna in a wireless manner, wherein 　　　　　　 the power transmitter side control unit is configured to 　　　　　　　　　　　　　 calculate an intensity value of the power supply request signal based on a received signal of the power transmitter side communication antenna, 　　　　　　　　　　　　　 energize the power transmitter antenna on condition that the calculated intensity value is determined to exceed a determination threshold, and 　　　　　　　　　　　　　 perform threshold setting processing to set the determination threshold to be larger when a driving speed of the vehicle is low, compared to when the driving speed is high.

2. A power receiver device to be applied to a wireless power supply system in which one of devices on a ground side and a vehicle (11) side is a power transmitter device (20) including a power transmitter antenna (22), and another device is the power receiver device (100) including a power receiver antenna (102), the power receiver device configured to transmit a power supply request signal to request power supply to the power transmitter device, the power transmitter device configured to supply power to the power receiver antenna in a wireless manner by energizing the power transmitter antenna on condition that the power transmitter device receives the power supply request signal, 　　　　　　 the power receiver device comprising: 　　　　　　 a power receiver side communication antenna (170) configured to perform wireless communication with a power transmitter side communication antenna (40) provided to the power transmitter device; and 　　　　　　 a power receiver side control unit (230) configured to control energization of the power receiver antenna and the power receiver side communication antenna, wherein 　　　　　　 the power receiver side control unit is configured to 　　　　　　　　　　　　　 calculate an intensity value of a transmission signal contained in a received signal of the power receiver side communication antenna based on the received signal, 　　　　　　　　　　　　　 supply the power supply request signal to the power receiver side communication antenna on condition that the calculated intensity value is determined to exceed an intensity threshold, and 　　　　　　　　　　　　　 set the intensity threshold to be larger when a driving speed of the vehicle is low, compared to when the driving speed is high.

3. The power transmitter device according to claim 1, wherein 　　　　　　 the power transmitter side control unit is configured to set the determination threshold to be larger as the driving speed becomes lower when the vehicle decelerates to speed of zero or near zero, or when the vehicle accelerates from speed of zero or near zero.

4. The power transmitter device according to claim 1, wherein 　　　　　　 the power transmitter side control unit is configured to 　　　　　　　　　　　　　 set the determination threshold to a predetermined upper limit threshold (IH) when the driving speed of the vehicle is zero, 　　　　　　　　　　　　　 predict whether a required time for the driving speed of the vehicle to reach zero is longer than a predetermined time when the vehicle decelerates, 　　　　　　　　　　　　　 set the determination threshold to a value that is smaller than the upper limit threshold and larger as the driving speed is lower when predicting that the required time is longer than the predetermined time, and 　　　　　　　　　　　　　 set the determination threshold to the upper limit threshold when predicting that the required time is shorter than the predetermined time.

5. The power transmitter device according to claim 3 or 4, wherein 　　　　　　 the power transmitter side control unit is configured to reduce a reception sensitivity of the power transmitter side communication antenna as the driving speed is lower.

6. The power transmitter device according to claim 3 or 4, wherein 　　　　　　 the power receiver device is provided to the vehicle, 　　　　　　 the power transmitter device is provided as the device on the ground side, 　　　　　　 the vehicle has a power storage battery (300) configured to be charged by power received at the power receiver antenna, and 　　　　　　 the power transmitter side control unit is configured to 　　　　　　　　　　　　　 acquire power storage capacity information on a power storage capacity of the power storage battery, and 　　　　　　　　　　　　　 perform the threshold setting processing on condition that the acquired power storage capacity of the power storage battery is equal to or higher than a predetermined value.

7. A program for a power transmitter device to be applied to a wireless power supply system in which one of devices on a ground side and a vehicle (11) side is the power transmitter device (20) including a power transmitter antenna (22), and another device is a power receiver device (100) including a power receiver antenna (102), the power receiver device configured to transmit a power supply request signal to request power supply to the power transmitter device, the power transmitter device configured to supply power to the power receiver antenna in a wireless manner by energizing the power transmitter antenna on condition that the power transmitter device receives the power supply request signal, the power transmitter device configured to receive the power supply request signal transmitted wirelessly from a power receiver side communication antenna (170) in the power receiver device by a power transmitter side communication antenna (40), the power transmitter device including a power transmitter side control unit (70) configured to control energization of the power transmitter antenna to supply power to the power receiver antenna in a wireless manner, 　　　　　　 the program configured to carry out: 　　　　　　 executing a process to cause the power transmitter side control unit to 　　　　　　 　　　　　　 calculate an intensity value of the power supply request signal based on a received signal of the power transmitter side communication antenna, 　　　　　　 　　　　　　 energize the power transmitter antenna on condition that the calculated intensity value is determined to exceed a determination threshold, and 　　　　　　 　　　　　　 perform threshold setting processing to set the determination threshold to be larger when a driving speed of the vehicle is low, compared to when the driving speed is high.

8. A control method for a power transmitter device to be applied to a wireless power supply system in which one of devices on a ground side and a vehicle (11) side is the power transmitter device (20) including a power transmitter antenna (22), and another device is a power receiver device (100) including a power receiver antenna (102), the power receiver device configured to transmit a power supply request signal to request power supply to the power transmitter device, the power transmitter device configured to supply power to the power receiver antenna in a wireless manner by energizing the power transmitter antenna on condition that the power transmitter device receives the power supply request signal, the power transmitter device configured to receive the power supply request signal transmitted wirelessly from a power receiver side communication antenna (170) in the power receiver device by a power transmitter side communication antenna (40), the power transmitter device including a power transmitter side control unit (70) configured to control energization of the power transmitter antenna to supply power to the power receiver antenna in a wireless manner, 　　　　　　 the control method comprising: 　　　　　　 executing a process to cause the power transmitter side control unit to 　　　　　　 　　　　　　 calculate an intensity value of the power supply request signal based on an output signal of the power transmitter side communication antenna, 　　　　　　 　　　　　　 energize the power transmitter antenna on condition that the calculated intensity value is determined to exceed a determination threshold, and 　　　　　　 　　　　　　 perform a threshold setting processing to set the determination threshold to be larger when a driving speed of the vehicle is low, compared to when the driving speed is high.

9. A program for a power receiver device to be applied to a wireless power supply system in which one of devices on a ground side and a vehicle (11) side is a power transmitter device (20) including a power transmitter antenna (22), and the other device is the power receiver device (100) including a power receiver antenna (102), the power receiver device configured to transmit a power supply request signal to request power supply to the power transmitter device, the power transmitter device configured to supply power to the power receiver antenna in a wireless manner by energizing the power transmitter antenna on condition that the power transmitter device receives the power supply request signal, the power receiver device including a power receiver side communication antenna (170) configured to perform wireless communication with a power transmitter side communication antenna (40) provided to the power transmitter device, the power receiver device including a power receiver side control unit (230) configured to control energization of the power receiver antenna and the power receiver side communication antenna, 　　　　　　 the program configured to carry out: 　　　　　　 executing a process to cause the power receiver side control unit to 　　　　　　 　　　　　　 calculate an intensity value of a transmission signal contained in a received signal of the power receiver side communication antenna based on the received signal, 　　　　　　 　　　　　　 supply the power supply request signal to the power receiver side communication antenna on condition that the calculated intensity value is determined to exceed an intensity threshold, and 　　　　　　 　　　　　　 set the intensity threshold to be larger when a driving speed of the vehicle is low, compared to when the driving speed is high.

10. A control method for a power receiver device to be applied to a wireless power supply system in which one of devices on a ground side and a vehicle (11) side is a power transmitter device (20) including a power transmitter antenna (22), and the other device is the power receiver device (100) including a power receiver antenna (102), the power receiver device configured to transmit a power supply request signal to request power supply to the power transmitter device, the power transmitter device configured to supply power to the power receiver antenna in a wireless manner by energizing the power transmitter antenna on condition that the power transmitter device receives the power supply request signal, the power receiver device including a power receiver side communication antenna (170) configured to perform wireless communication with a power transmitter side communication antenna (40) provided to the power transmitter device, the power receiver device including a power receiver side control unit (230) configured to control energization of the power receiver antenna and the power receiver side communication antenna, 　　　　　　 the control method comprising: 　　　　　　 executing a process to cause the power receiver side control unit to 　　　　　　 　　　　　　 calculate an intensity value of a transmission signal contained in a received signal of the power receiver side communication antenna based on the received signal, 　　　　　　 　　　　　　 supply the power supply request signal to the power receiver side communication antenna on condition that the calculated intensity value is determined to exceed an intensity threshold, and 　　　　　　 　　　　　　 set the intensity threshold to be larger when a driving speed of the vehicle is low, compared to when the driving speed of the vehicle is high.

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