Wireless power supply system

Abstract

To efficiently supply power to equipment according to the power transmission conditions. [Solution] One aspect of the present disclosure is a wireless power supply system comprising: a power transmitter that transmits radio waves; a relay that receives power from the radio waves transmitted from the power transmitter and transmits radio waves to supply power to equipment; and a control unit that controls the power supply to the equipment, wherein the relay acquires equipment information relating to a first equipment that is being powered by its own device, the control unit calculates the degree of congestion for each relay based on the equipment information for each relay, and selects a relay to supply power to a second equipment based on the degree of congestion.

Description

Technical Field

[0001] The present invention relates to a wireless power supply system.

Background Art

[0002] Conventionally, a technique for supplying power to a device by wireless power supply is known. For example, Patent Document 1 describes a management device that manages wireless power transmission from a power transmission device to a power reception device via a relay device. This management device includes a power transmission path determination unit that determines a power transmission path from a power transmission device of a power transmission source to a power reception device of a power reception target based on the position of the power transmission device, the position of the power reception device, and map information, and a relay control unit that causes at least one of a plurality of relay devices to relay wireless power transmission from the power transmission device to the power reception device based on the power transmission path. When the power transmission path determination unit determines that a physical line of sight between the power transmission device and the power reception device can be secured, it determines a power transmission path connecting the position of the power transmission device and the position of the power reception device. When it determines that the power transmission path cannot be secured, it determines a power transmission path so as to secure a physical line of sight from the power transmission device to the power reception device by at least one relay point, and determines a relay device that executes relaying at the relay point among the plurality of relay devices. The relay control unit transmits an instruction to move to the relay point to the relay device determined by the power transmission path determination unit, and causes the relay device to relay wireless power transmission from the power transmission device to the power reception device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In wireless power transfer systems, when charging target equipment via a receiver from a transmitter, the range of the radio waves from the transmitter is limited, thus restricting the area where power can be supplied to the receiver. In this case, to use wireless power transfer in a large area such as a factory, it is necessary to install transmitters at regular intervals and operate multiple transmitters. Furthermore, if there are obstacles such as walls or doors between the transmitter and receiver, the radio wave strength will decrease due to the obstacles, making it impossible for a single transmitter to stably supply power to the entire area.

[0005] Furthermore, while the aforementioned management system can achieve wireless power transmission by placing a relay device between the power transmission device and the power receiving device, wireless power transmission may be limited depending on the power transmission status of the relay device. Also, even if multiple power transmission devices and multiple relay devices are deployed, if the power transmission path is limited, some power transmission devices or relay devices may end up transmitting a large amount of power.

[0006] This disclosure is made in view of these circumstances and aims to provide a wireless power supply system that can efficiently supply power to equipment according to the power transmission conditions. [Means for solving the problem]

[0007] This disclosure has been made to solve the above-mentioned problems, and one aspect of this disclosure is a wireless power supply system comprising: a power transmitter that transmits radio waves; a relay that receives power from the radio waves transmitted from the power transmitter and transmits radio waves to supply power to equipment; and a control unit that controls the power supply to the equipment, wherein the relay acquires equipment information relating to a first equipment that is being powered by its own device, the control unit calculates the degree of congestion for each relay based on the equipment information for each relay, and selects a relay to supply power to a second equipment based on the degree of congestion.

[0008] Another aspect of the present disclosure is a wireless power supply system comprising a power transmitter that transmits radio waves, a plurality of relays that supply power, and a control unit that controls the power supply to the equipment, wherein each of the relays acquires equipment information relating to the equipment it is powering, the control unit calculates a congestion level for each of the relays based on the equipment information for each relay, and controls the amount of power supplied from the power transmitter to each of the relays based on the congestion level.

[0009] Another aspect of the present disclosure is a wireless power supply system comprising: a plurality of transmitters that transmit radio waves; a relay that receives power from radio waves transmitted from at least one of the transmitters and transmits radio waves to supply power to equipment; and a control unit that controls the power supply to the equipment, wherein each of the transmitters acquires relay information relating to the relay that is transmitting radio waves by its own device; the relay acquires equipment information relating to the equipment that is being powered by its own device; the control unit calculates a congestion level for each transmitter based on the relay information and equipment information for each transmitter, and selects a transmitter to supply power to the relay based on the congestion level. [Effects of the Invention]

[0010] According to one aspect of the present invention, power can be efficiently supplied to equipment according to the power transmission conditions. [Brief explanation of the drawing]

[0011] [Figure 1] This figure shows an example configuration of the wireless power supply system 1 in the first embodiment. [Figure 2] This sequence shows an example of the processing of the wireless power supply system 1 in the first embodiment. [Figure 3] This figure shows an example configuration of the wireless power supply system 1A in the second embodiment. [Figure 4] This figure shows an example configuration of the wireless power supply system 1B in the third embodiment. [Figure 5] This figure shows another example of the wireless power supply system 1B in the third embodiment. [Modes for carrying out the invention]

[0012] The following describes a power supply system, power supply method, and program to which the present invention is applied, with reference to the drawings.

[0013] (First Embodiment) Figure 1 shows an example configuration of the wireless power supply system 1 in the first embodiment. The wireless power supply system 1 includes, for example, a power transmitter 100, a repeater 200, a control unit 300, a server device 310, and equipment 400. The power transmitter 100 transmits radio waves. As a result, the power transmitter 100 exchanges radio waves S10a and S10b with the repeaters 200A and 200B, and the power transmitter 100 supplies power P10a to repeater 200A and power P10b to repeater 200B. The repeater 200 receives power from radio waves transmitted from the transmitter 100 and transmits radio waves to supply power to the equipment 400. In this embodiment, the repeater 200 includes, for example, repeater 200A and repeater 200B. Repeater 200A supplies power P20a to equipment 400A, power P20b to equipment 400B, and power P20c to equipment 400C. Repeater 200B supplies power P20d to equipment 400D, power P20e to equipment 400E, and power P20f to equipment 400F. The control unit 300 controls the power supply to the equipment 400. Controlling the power supply includes at least one of the following: the control unit 300 controlling the operation of the power transmitter 100, controlling the power transmission of the power transmitter 100, and controlling the power transmission of the repeater 200.

[0014] Device 400 receives radio waves transmitted from the relay device 200 and receives power. Device 400 can be any device that operates using the power it receives, such as an IoT device. The relay device 200 acquires device information regarding the first device 400 that is powered by the device itself. The relay device 200A acquires device information by receiving radio waves S20a and S20b from the devices 400A and 400B. The relay device 200B acquires device information by receiving radio waves S20c, S20d, S20e, and S20f from each of the devices 400C, 400D, 400E, and 400F. The control unit 300 calculates the congestion level for each relay device 200 based on the device information for each relay device 200, and selects a relay device 200 that supplies power to the second device 400 based on the congestion level.

[0015] In the embodiment, the power transmitter 100, the relay device 200, and the device 400 transmit power using an existing wireless communication method such as a microwave method. Also, the relay device 200 and the device 400 exchange information with each other using existing wireless communication technologies such as WiFi (registered trademark), BLE (Bluetooth Low Energy), and LPWA (Low Power Wide Area), and the power transmitter 100 and the relay device 2 operate to transmit power. The relay device 200 and the device 400 exchange information with each other using existing wireless communication technologies such as WiFi (registered trademark).

[0016] The power transmitter 100 performs beamforming processing and transmits radio waves from the device itself to each of the plurality of relay devices 200A and 200B. Thereby, the power transmitter 100 supplies power P10a to the relay device 200A, and the power transmitter 100 supplies power P10b to the relay device 200B. The relay device 200A performs beamforming processing and transmits radio waves from the device itself to each of the plurality of devices 400A and 400B, and the relay device 200B performs beamforming processing and transmits radio waves from the device itself to each of the plurality of devices 400C, 400D, 400E, and 400F.

[0017] The power transmitter 100 transmits radio waves in a high-frequency band among a plurality of frequency bands that the relay device 200 can support, and the relay device 200 transmits radio waves in a low-frequency band among the plurality of frequency bands that the relay device 200 can support. The radio waves in the high-frequency band are, for example, radio waves in the 5.7 GHz band. The radio waves in the low-frequency band are, for example, radio waves in the 920 MHz band.

[0018] FIG. 2 is a sequence diagram showing an example of the operation procedure of the wireless power supply system 1 in the first embodiment. First, the device 400 transmits alert information S100 requesting power to the relay device 200. The relay device 200 receives the alert information S100, relays the alert information S102 to the power transmitter 100, the power transmitter 100 transmits the alert information S104 to the control unit 300 (access point), and the control unit 300 transmits a power transmission instruction S106 to the server device 310. The alert information may include information indicating the amount of power to be supplied to the device 400 and information indicating whether the device 400 needs constant power supply, and the power transmission instruction S106 may include, for example, the information included in the alert information. Thereby, the relay device 200 can acquire device information regarding the first device 400 that is being powered by the self-device, and can acquire the device information of the second device 400 that has not yet received power from the relay device 200.

[0019] The server device 310 transmits a transmission instruction request S108 to the control unit 300, and the control unit 300 transmits a beacon request S110 to the power transmitter 100. In response to receiving the beacon request S110 from the control unit 300, the power transmitter 100 transmits a beacon request S112 to the relay device 200. The relay device 200 returns a response S114 in response to receiving the beacon request S112, and the power transmitter 100 transmits the response S116 to the control unit 300 for the beacon request S110. The control unit 300 calculates the position information of the relay device 200 and the position information of the device 400 based on the responses S114 and S116, and transmits a response S118 to the server device 310.

[0020] The server device 310 selects a repeater 200 that can efficiently supply power to the equipment 400 based on the location of the power transmitter 100, the location of the repeater 200, the location of the equipment 400, etc., and sends a power transmission request S120 including the selection result to the control unit 300. At this time, the server device 310 calculates the congestion level for each repeater 200 based on the equipment information for each repeater 200, and selects a repeater 200 to supply power to the second equipment 400 based on the congestion level. Note that the process of selecting the repeater 200 to supply power may also be performed by the control unit 300. The control unit 300 sends a power transmission request S122 to the repeater 200 selected based on the power transmission request S120. When the power transmitter 100 receives the power transmission request S122, it performs beamforming processing and outputs a 5.7GHz band power transmission radio wave S124 to the selected repeater 200. Upon receiving the power transmission radio wave S124, the repeater 200 performs beamforming processing and outputs a 920MHz band repeater radio wave S126 to supply power to the device 400.

[0021] As described above, according to the wireless power supply system 1 in the first embodiment, the repeater 200 acquires device information relating to the first device 400 that is being powered by its own device, the control unit 300 or server device 310 calculates the congestion level for each repeater 200 based on the device information for each repeater 200, and selects a repeater 200 to supply power to the second device 400 based on the congestion level, thereby enabling efficient power supply to the device 400.

[0022] (Second Embodiment) The second embodiment will be described below. Figure 3 is a block diagram showing an example configuration of the wireless power supply system 1A in the second embodiment. The wireless power supply system 1A includes, for example, a power transmitter 100, a plurality of repeaters 200A, 200B, a control unit 300, a server device 310, and equipment 400. The power transmitter 100 transmits radio waves. Each of the multiple repeaters 200A and 200B receives power from radio waves transmitted from the power transmitter 100 and transmits radio waves to supply power to the equipment 400. The control unit 300 controls the power supply to the equipment 400. Controlling the power supply includes at least one of the following: the control unit 300 controlling the operation of the power transmitter 100, controlling the power transmission of the power transmitter 100, and controlling the power transmission of each of the multiple repeaters 200A and 200B.

[0023] Device 400 receives radio waves transmitted from the relay device 200 and receives power. Device 400 can be any device that operates using the power it receives, such as an IoT device. The repeater 200 acquires device information regarding the first device 400, which is powered by its own device.

[0024] The control unit 300 calculates the congestion level for each repeater 200A and 200B based on the equipment information for each repeater 200A and 200B, and controls the amount of power supplied from the power transmitter 100 to each of the repeaters 200A and 200B, P10a and P10b, based on the congestion level. For example, if repeater 200A is connected to devices 400A and 400B, and repeater 200B is connected to devices 400C, 400C, 400D, 400E, and 400F, and repeater 200B is more congested than repeater 200A, then the control unit 300 controls the power transmitter 100 to supply more power to repeater 200B than to repeater 200A.

[0025] In this embodiment, the power transmitter 100, the repeater 200, and the device 400 transmit power using existing wireless communication methods, such as microwaves. The repeater 200 and the device 400 exchange information with each other using existing wireless communication technologies such as Wi-Fi, and the power transmitter 100 and the repeater 200 also exchange information with each other using existing wireless communication technologies such as Wi-Fi.

[0026] Each of the repeaters 200A and 200B may acquire the charge level of the battery built into its device or the amount of power supplied to the device 400. The control unit 300 can control the amount of power supplied from the transmitter 100 to each of the repeaters 200A and 200B based on the congestion level of each repeater 200A and 200B, as well as the charge level of the battery built into each repeater 200A and 200B or the amount of power supplied to the device 400.

[0027] Each of the repeaters 200A and 200B may acquire the charge level of the battery built into the device 400 or the amount of power required for the operation of the device 400. The control unit 300 can control the amount of power supplied from the power transmitter 100 to each of the repeaters 200A and 200B based on the charge level of the battery built into the device 400 or the amount of power required for the operation of the device 400 acquired from each of the repeaters 200A and 200B.

[0028] The power transmitter 100 performs beamforming and transmits radio waves from itself to each of the multiple repeaters 200A and 200B. As a result, the power transmitter 100 supplies power P10a to repeater 200A and power P10b to repeater 200B. Repeater 200A performs beamforming and transmits radio waves from itself to multiple devices 400A and 400B, while repeater 200B performs beamforming and transmits radio waves from itself to multiple devices 400C, 400D, 400E, and 400F.

[0029] The transmitter 100 transmits radio waves in the high frequency band from among the multiple frequency bands that the repeater 200 can handle, and the repeater 200 transmits radio waves in the low frequency band from among the multiple frequency bands that the repeater 200 can handle. The high frequency band radio waves are, for example, radio waves in the 5.7 GHz band. The low frequency band radio waves are, for example, radio waves in the 920 MHz band.

[0030] According to the wireless power supply system 1A of the second embodiment, each of the repeaters 200A and 200B acquires device information relating to the equipment 400 being powered by their respective devices, and the control unit 300 calculates the congestion level for each of the repeaters 200A and 200B based on the device information for each repeater 200A and 200B, and can control the amount of power supplied from the transmitter 100 to each of the repeaters 200A and 200B based on the congestion level. Furthermore, according to the wireless power supply system 1A, each of the repeaters 200A and 200B acquires the charge level of the battery built into their respective devices or the amount of power supplied to the equipment 400, and the control unit 300 can control the amount of power supplied from the transmitter 100 to each of the repeaters 200A and 200B based on the congestion level for each repeater 200A and 200B, as well as the charge level of the battery built into each of the repeaters 200A and 200B or the amount of power supplied to the equipment 400. Furthermore, according to the wireless power supply system 1A, each of the repeaters 200A and 200B acquires the charge amount of the battery built into the device 400 or the amount of power required for the operation of the device 400, and the control unit 300 can control the amount of power supplied from the transmitter 100 to each of the repeaters 200A and 200B based on the charge amount of the battery built into the device 400 or the amount of power required for the operation of the device 400 acquired from each of the repeaters 200A and 200B. As a result, the wireless power supply system 1A can efficiently supply power to the equipment 400 by controlling the amount of power supplied from the transmitter 100 to the repeater 200 according to the power transmission conditions, such as the congestion level of each repeater 200A and 200B, the charge level of the batteries built into each repeater 200A and 200B or the amount of power supplied to the equipment 400, and the charge level of the battery built into the equipment 400 or the amount of power required for the operation of the equipment 400.

[0031] (Third embodiment) The third embodiment will be described below. Figure 4 is a block diagram showing an example configuration of the wireless power supply system 1B in the third embodiment. The wireless power supply system 1B includes, for example, multiple transmitters 100A, 100B, repeaters 200, 200B, a control unit 300, a server device 310, and equipment 400. The 100A and 100B power transmitters each transmit radio waves. Each of the multiple repeaters 200A and 200B receives power from radio waves transmitted from the power transmitter 100 and transmits radio waves to supply power to the equipment 400. The control unit 300 controls the power supply to the equipment 400. Controlling the power supply includes at least one of the following: the control unit 300 controlling the operation of the power transmitter 100, controlling the power transmission of the power transmitter 100, and controlling the power transmission of each of the multiple repeaters 200A and 200B.

[0032] Each of the repeaters 200A and 200B acquires equipment information about the equipment 400 that it supplies power to. The control unit 300 calculates the congestion level for each of the power transmitters 100A and 100B based on the repeater information and equipment information for each transmitter, and selects a power transmitter to supply power to the repeater 200 based on the congestion level. For example, suppose that equipment 400A and 400B are connected to repeater 200A, equipment 400C, 400D, 400E, and 400F are connected to repeater 200B, equipment 400G and 400H are not connected to any repeater 200, and that power transmission 100A supplies power to both repeaters 200A and 200B, and power transmission 100B supplies power to repeater 200B. In this case, if the control unit 300 determines, based on the equipment information obtained from power transmission 100A and 100B, that the congestion level of power transmission 100A is higher than that of power transmission 100B, it stops power transmission from power transmission 100A to repeater 200B and increases the power P10b transmitted from power transmission 100B to repeater 200B. When power transmission is performed using the Time Division Multiple Access (TDMA) method, the control unit 300 may increase the power transmission time from the transmitter 100B to the repeater 200.

[0033] Figure 5 is a block diagram showing another example of the wireless power supply system 1B in the third embodiment. For example, suppose that equipment 400A and 400B are connected to repeater 200A, equipment 400C, 400D, 400E, and 400F are connected to repeater 200B, equipment 400G and 400H are not connected to any repeater 200, and that power transmitter 100A supplies power to both repeaters 200A and 200B, while power transmitter 100B does not supply power to any repeater. In this case, if the control unit 300 determines, based on the equipment information obtained from each of the power transmission units 100A and 100B, that the congestion level of power transmission unit 100A is higher than that of power transmission unit 100B, it stops power transmission from power transmission unit 100A to repeater unit 200B and starts power transmission from power transmission unit 100B to repeater unit 200B.

[0034] In this embodiment, the power transmitter 100, the repeater 200, and the device 400 transmit power using existing wireless communication methods, such as microwaves. The repeater 200 and the device 400 exchange information with each other using existing wireless communication technologies such as Wi-Fi, and the power transmitter 100 and the repeater 200 also exchange information with each other using existing wireless communication technologies such as Wi-Fi.

[0035] The control unit 300 may calculate the congestion level for each repeater 200A and 200B based on the equipment information for each repeater 200A and 200B, and select a power transmission unit 100 to supply power to the repeater 200 based on the congestion level for each repeater 200A and 200B in addition to the congestion level for each power transmission unit 100A and 100B. For example, the control unit 300 may select a repeater 200 to receive power from power transmission unit 100 based on the congestion level obtained by adding the congestion level of the power transmission unit 100 and the congestion level of the repeater 200.

[0036] Each of the repeaters 200A and 200B acquires the charge level of the battery built into the device 400 or the amount of power required for the operation of the device 400. The control unit 300 may then select a power transmitter 100 to supply power to the repeaters 200A and 200B based on the charge level of the battery built into the device 400 or the amount of power required for the operation of the device 400 acquired from each of the repeaters 200A and 200B.

[0037] Each of the power transmitters 100A and 100B performs beamforming and transmits radio waves from its own device to each of the multiple repeaters 200A and 200B. The repeaters 200A and 200B then perform broadcast processing and transmit radio waves from their own device to each of the multiple devices 400.

[0038] The transmitter 100 transmits radio waves in the high frequency band from among the multiple frequency bands that the repeater 200 can handle, and the repeater 200 transmits radio waves in the low frequency band from among the multiple frequency bands that the repeater 200 can handle. The high frequency band radio waves are, for example, radio waves in the 5.7 GHz band. The low frequency band radio waves are, for example, radio waves in the 920 MHz band.

[0039] According to the third embodiment of the wireless power supply system 1B, each of the transmitters 100A and 100B acquires repeater information relating to the repeater 200 that transmits radio waves using its own device, the repeater 200 acquires device information relating to the device 400 that it supplies power to using its own device, the control unit 300 calculates the congestion level for each of the transmitters 100A and 100B based on the repeater information and device information for each transmitter, and can select a transmitter 100 to supply power to the repeater 200 based on the congestion level. Furthermore, according to the wireless power supply system 1B, the control unit 300 calculates the congestion level for each of the repeaters 200A and 200B based on the device information for each repeater, and can select a transmitter 100 to supply power to the repeater 200 based on the congestion level for each of the transmitters 100A and 100B, in addition to the congestion level for each of the repeaters 200A and 200B. Furthermore, according to the wireless power supply system 1B, the charge level of the battery built into the device 400 or the amount of power required for the operation of the device 400 is obtained by the repeaters 200A and 200B respectively, and the control unit 300 can select the transmitter 100 to supply power to the repeater 200 based on the charge level of the battery built into the device 400 or the amount of power required for the operation of the device 400 obtained from the repeaters 200A and 200B respectively. As a result, the wireless power supply system 1B can efficiently supply power to devices by selecting the power source according to the power transmission conditions, such as the congestion level of each transmitter, the congestion level of each relay, the charge level of the battery built into the device, or the amount of power required for the operation of the device.

[0040] The functions of the power transmitter 100, relay unit 200, control unit 300, server device 310, and equipment 400 in the above-described embodiment may be implemented using a computer. In that case, the functions may be implemented by recording a program for implementing these functions on a computer-readable recording medium, loading the program recorded on this recording medium into a computer system, and executing it. Here, "computer system" includes hardware such as an OS and peripheral devices. Furthermore, "computer-readable recording medium" refers to portable media such as flexible disks, magneto-optical disks, ROMs, CD-ROMs, and storage devices such as hard disks built into a computer system. Moreover, "computer-readable recording medium" may also include those that dynamically hold programs for a short period of time, such as communication lines used when transmitting programs via networks such as the Internet or communication lines such as telephone lines, and those that hold programs for a certain period of time, such as volatile memory inside a computer system that acts as a server or client in such a case. Furthermore, the above-mentioned program may be for implementing a part of the functions described above, or it may be a program that can implement the above-mentioned functions in combination with a program already recorded in the computer system, or it may be implemented using a programmable logic device such as an FPGA (Field Programmable Gate Array).

[0041] Although various embodiments and variations have been described, these are merely examples and are not limited to these. For example, one embodiment or variation, or a part of one embodiment or variation, may be combined with one or more other embodiments or variations to realize one aspect of the present invention. [Explanation of Symbols]

[0042] 1, 1A, 1B Wireless Power Transfer System 100 Power Transmitters 200 repeaters 300 Control Unit 310 Server Device 400 equipment

Claims

1. A power transmitter that transmits radio waves, A relay device that receives power from radio waves transmitted from the aforementioned power transmitter and transmits radio waves to supply power to equipment, The device comprises a control unit that controls the power supply to the device, The relay device acquires device information relating to the first device that is powered by its own device, The control unit calculates the congestion level for each relay unit based on the equipment information for each relay unit, and selects the relay unit to supply power to the second equipment based on the congestion level. Wireless power supply system.

2. The aforementioned power transmitter performs beamforming processing to transmit radio waves from itself to each of the multiple relay devices. The relay device performs beamforming processing to transmit radio waves from itself to each of the multiple devices. The wireless power supply system according to claim 1.

3. The wireless power supply system according to claim 1 or 2, wherein the power transmitter transmits radio waves in the high frequency band among a plurality of frequency bands that the repeater can handle, and the repeater transmits radio waves in the low frequency band among a plurality of frequency bands that the repeater can handle.

4. A power transmitter that transmits radio waves, Multiple relay units that receive power from radio waves transmitted from the aforementioned power transmitter and transmit radio waves to supply power to equipment, The device comprises a control unit that controls the power supply to the device, Each of the relay devices acquires device information relating to the equipment it is powering, The control unit calculates the congestion level for each relay unit based on the equipment information for each relay unit, and controls the amount of power supplied from the power transmitter to each of the relay units based on the congestion level. Wireless power supply system.

5. Each of the relay devices acquires the charge level of the battery built into its device or the amount of power supplied to the device. The control unit controls the amount of power supplied from the transmitter to each of the relay units based on the congestion level of each relay unit, as well as the charge level of the battery built into each relay unit or the amount of power supplied to the equipment. The wireless power supply system according to claim 4.

6. Each of the relay devices acquires the charge level of the battery built into the device or the amount of power required for the operation of the device. The wireless power supply system according to claim 5, wherein the control unit controls the amount of power supplied from the transmitter to each of the relay units based on the amount of charge of the battery built into the equipment or the amount of power required for the operation of the equipment, obtained from each of the relay units.

7. The aforementioned power transmitter performs beamforming processing to transmit radio waves from itself to each of the multiple relay devices. The relay device performs broadcast processing and transmits radio waves from itself to each of the multiple devices. A wireless power supply system according to any one of claims 4 to 6.

8. The wireless power supply system according to any one of claims 4 to 6, wherein the power transmitter transmits radio waves in the high frequency band among a plurality of frequency bands that the repeater can handle, and the repeater transmits radio waves in the low frequency band among a plurality of frequency bands that the repeater can handle.

9. Multiple power transmitters that transmit radio waves, A relay device that receives power from radio waves transmitted from at least one of the aforementioned power transmitters and transmits radio waves to supply power to equipment, The device comprises a control unit that controls the power supply to the device, Each of the aforementioned power transmitters acquires relay information relating to the relays that are transmitting radio waves using its own device. The relay device acquires device information relating to the device that is being powered by its own device, The control unit calculates the congestion level for each power transmission based on the relay information and equipment information for each power transmission, and selects the power transmission to supply power to the relay based on the congestion level. Wireless power supply system.

10. The wireless power supply system according to claim 9, wherein the control unit calculates the degree of congestion for each repeater based on the equipment information for each repeater, and selects a power transmitter to supply power to the repeater based on the degree of congestion for each repeater in addition to the degree of congestion for each power transmitter.

11. Each of the relay devices acquires the charge level of the battery built into the device or the amount of power required for the operation of the device. The wireless power supply system according to claim 10, wherein the control unit selects the power transmitter to supply power to the relay unit based on the amount of charge of the battery built into the equipment or the amount of power required for the operation of the equipment, obtained from each of the relay units.

12. Each of the aforementioned power transmitters performs beamforming processing to transmit radio waves from its own device to each of the multiple relay devices. The relay device performs broadcast processing and transmits radio waves from itself to each of the multiple devices. A wireless power supply system according to any one of claims 9 to 11.

13. A wireless power supply system according to any one of claims 9 to 11, wherein each of the power transmitters transmits radio waves in the high frequency band among a plurality of frequency bands that the repeater can handle, and the repeater transmits radio waves in the low frequency band among a plurality of frequency bands that the repeater can handle.

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