Wireless power supply system

Abstract

This wireless power supply system comprises: a power transmitter that transmits radio waves; a relay device that receives power by the radio waves transmitted from the power transmitter, transmits the radio waves, and supplies power to a device; and a control unit that controls power supply to the device. The relay device acquires device information pertaining to a first device to which power is being supplied by the relay device. The control unit calculates the degree of congestion for each relay device on the basis of the device information for each relay device, and selects the relay device that supplies power to a second device on the basis of the degree of congestion.

Description

Wireless power supply system

[0001] The present invention relates to a wireless power supply system. This application claims priority based on Japanese Patent Application No. 2024-159831 filed in Japan on September 17, 2024, and incorporates its content herein by reference.

[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 at the power transmission source to a power reception device at the power reception target based on the positions of the power transmission device and 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 ensured, it determines a power transmission path connecting the positions of the power transmission device and the power reception device. When it determines that the power transmission path cannot be ensured, it determines a power transmission path so as to ensure 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 from a plurality of relay devices. The relay control unit transmits a movement instruction 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.

[0003] Japanese Patent No. 7018981

[0004] In a wireless power supply system, when charging a target device via a power receiver from a power transmitter, since there is a limit to the range where radio waves from the power transmitter can reach, the area where power can be supplied to the power receiver is limited. In this case, for example, in a large-site area such as a factory, in order to use wireless power supply, it is necessary to install power transmitters at regular intervals and operate a plurality of power transmitters. Also, when there are obstacles such as walls and doors between the power transmitter and the power receiver, the radio wave intensity may decrease due to the obstacles, and it may not be possible to stably supply power to the entire area with a single power transmitter.

[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.

[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.

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

[0011] This is a diagram showing an example configuration of the wireless power supply system 1 in the first embodiment. This is a sequence showing an example of processing of the wireless power supply system 1 in the first embodiment. This is a diagram showing an example configuration of the wireless power supply system 1A in the second embodiment. This is a diagram showing an example configuration of the wireless power supply system 1B in the third embodiment. This is a diagram showing another example of the wireless power supply system 1B in the third embodiment.

[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 is a diagram showing an example configuration of a 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 the repeater 200A and power P10b to the repeater 200B. The repeater 200 receives power from the radio waves transmitted from the power transmitter 100 and transmits radio waves to supply power to the equipment 400. In this embodiment, the repeater 200 includes, for example, a repeater 200A and a repeater 200B. Repeater 200A supplies power P20a to device 400A, power P20b to device 400B, and power P20c to device 400C. Repeater 200B supplies power P20d to device 400D, power P20e to device 400E, and power P20f to device 400F. Control unit 300 controls the power supply to device 400. Controlling the power supply includes at least one of the following: control of the operation of the power transmitter 100, control of the power transmission of the power transmitter 100, and control of the power transmission of the repeater 200.

[0014] Device 400 receives radio waves transmitted from the repeater 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 about the first device 400 that it is powering. Repeater 200A acquires device information by receiving radio waves S20a and S20b from devices 400A and 400B. Repeater 200B acquires device information by receiving radio waves S20c, S20d, S20e and S20f from devices 400C, 400D, 400E and 400F, respectively. Here, in this specification, among the multiple devices 400, the device 400 that is powered by the repeater 200 is sometimes referred to as the first device 400, and the device 400 that has not yet received power from the repeater 200 is sometimes referred to as the second device 400. The control unit 300 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.

[0015] 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®, BLE (Bluetooth Low Energy), and LPWA (Low Power Wide Area), and the power transmitter 100 and the repeater 200 exchange information with each other using existing wireless communication technologies such as Wi-Fi®.

[0016] The power transmitter 100 performs beamforming and transmits radio waves from its own device 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 its own device to each of the multiple devices 400A and 400B, and repeater 200B performs beamforming and transmits radio waves from its own device to each of the multiple devices 400C, 400D, 400E, and 400F. Alternatively, as shown in Figure 1, repeater 200A may transmit radio waves to device 400C.

[0017] The transmitter 100 transmits radio waves in the high frequency band among the multiple frequency bands that the repeater 200 can handle, and the repeater 200 transmits radio waves in the low frequency band 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. The multiple frequency bands that the repeater 200 can handle are, for example, multiple frequencies that the repeater 200 can transmit and / or receive. The multiple frequency bands that the repeater 200 can handle may include, for example, the 920 MHz band, the 2.4 GHz band, and the 5.7 GHz band (see Figure 1).

[0018] Figure 2 is a sequence diagram showing an example of the operation procedure of the wireless power supply system 1 in the first embodiment. First, device 400 transmits alert information S100 requesting power to the repeater 200. The repeater 200 receives the alert information S100 and relays the alert information S102 to the transmitter 100. The transmitter 100 transmits the alert information S104 to the control unit 300 (access point). 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 device 400 and information indicating whether device 400 needs to be constantly powered. The power transmission instruction S106 may include, for example, the information included in the alert information. As a result, the repeater 200 can acquire device information relating to the first device 400 that is being powered by its own device, and can acquire device information relating to the first device 400 and the device information of the second device 400 that has not yet received power from the repeater 200.

[0019] The server device 310 sends a transmission instruction request S108 to the control unit 300, and the control unit 300 sends a beacon request S110 to the transmitter 100. The transmitter 100 sends a beacon request S112 to the repeater 200 in response to receiving the beacon request S112. The repeater 200 sends a reply S114 in response to receiving the beacon request S112, and the transmitter 100 sends a reply S116 to the control unit 300 in response to the beacon request S110. The control unit 300 calculates the location information of the repeater 200 and the location information of the device 400 based on replies S114 and S116, and sends a reply 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 transmits 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 be performed by the control unit 300. The control unit 300 transmits 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 5.7 GHz 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 920 MHz band repeater radio wave S126 to supply power to the equipment 400.

[0021] As described above, the wireless power supply system 1 in the first embodiment includes a power transmitter 100 that transmits radio waves, a repeater 200 that receives power from radio waves transmitted from the power transmitter 100 and transmits radio waves to supply power to the equipment 400, and a control unit 300 that controls the power supply to the equipment 400. The repeater 200 acquires equipment information about the first equipment 400 that it is supplying power to, and the control unit 300 or 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. This enables efficient power supply to the equipment 400.

[0022] (Second Embodiment) The second embodiment will now be described. The second embodiment has the same basic configuration as the first embodiment, and the same components will be denoted by the same reference numerals. In addition, the description of similar components may be omitted. 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 plurality of repeaters 200A, 200B receives power from the 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 repeater 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 about the first device 400 that it is powering.

[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 equipment 400A and 400B are connected to repeater 200A, and equipment 400C, 400C, 400D, 400E, and 400F are connected to repeater 200B, and the congestion level of repeater 200B is higher than that of repeater 200A, 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 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 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] Transmitter 100 performs beamforming and transmits radio waves from its own device to each of the multiple repeaters 200A and 200B. As a result, Transmitter 100 supplies power P10a to repeater 200A and power P10b to repeater 200B. Repeater 200A performs beamforming and transmits radio waves from its own device to each of the multiple devices 400A and 400B, and repeater 200B performs beamforming and transmits radio waves from its own device to each of the multiple devices 400C, 400D, 400E, and 400F. Alternatively, as shown in Figure 3, repeaters 200A and 200B may perform broadcast processing and transmit radio waves from their own devices to each of the multiple devices 400.

[0029] The power 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 its own device, 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 its own device 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. Thus, according to the wireless power supply system 1A, power can be efficiently supplied to the device 400 by controlling the amount of power supplied from the transmitter 100 to the repeater 200 according to the power supply conditions such as the congestion level of each of the repeaters 200A and 200B, the charge amount of the battery built into each of the repeaters 200A and 200B or the amount of power supplied to the device 400, and the charge amount of the battery built into the device 400 or the amount of power required for the operation of the device 400.

[0031] (Third Embodiment) The third embodiment will now be described. The third embodiment has the same basic configuration as the first and / or second embodiments, and similar components will be denoted by the same reference numerals. Also, descriptions of similar components may be omitted. 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, a plurality of transmitters 100A, 100B, repeaters 200, 200B, a control unit 300, a server device 310, and equipment 400. Each of the transmitters 100A, 100B transmits radio waves. Each of the plurality of repeaters 200A, 200B receives power from the radio waves transmitted from the 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 is powering. The control unit 300 calculates the congestion level for each of the transmitters 100A and 100B based on the repeater information and equipment information for each transmitter, and selects a transmitter to supply power to the repeater 200 based on the congestion level. For example, assume 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 of the repeaters 200, transmitter 100A supplies power to both repeaters 200A and 200B, and transmitter 100B supplies power to repeater 200B. In this case, if the control unit 300 determines, based on the equipment information obtained from each of the power transmitters 100A and 100B, that the congestion level of power transmitter 100A is higher than that of power transmitter 100B, it stops power transmission from power transmitter 100A to repeater 200B and increases the power P10b transmitted from power transmitter 100B to repeater 200B. When power transmission is performed using the Time Division Multiple Access (TDMA) method, the control unit 300 may lengthen the power transmission time from power transmitter 100B to 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, 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 of the repeaters 200, transmitter 100A supplies power to both repeaters 200A and 200B, and transmitter 100B does not supply power to any of the repeaters. In this case, if the control unit 300 determines, based on the equipment information obtained from each of the transmitters 100A and 100B, that the congestion level of transmitter 100A is higher than that of transmitter 100B, it stops power transmission from transmitter 100A to repeater 200B and starts power transmission from transmitter 100B to repeater 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 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, and the repeaters 200A and 200B perform broadcast processing and transmit radio waves from their own device to each of the multiple devices 400.

[0038] The power 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 wireless power supply system 1B of the third embodiment, each of the power transmitters 100A and 100B acquires relay information relating to the relay 200 that transmits radio waves using its own device, the relay 200 acquires device information relating to the device 400 that it supplies power to using its own device, and the control unit 300 calculates the congestion level for each of the power transmitters 100A and 100B based on the relay information and device information for each power transmitter 100A and 100B, and can select a power transmitter 100 to supply power to the relay 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 relays 200A and 200B based on the device information for each power transmitter 100A and 100B, and can select a power transmitter 100 to supply power to the relay 200 based on the congestion level for each of the relays 200A and 200B in addition to the congestion level for each power transmitter 100A and 100B. Furthermore, according to the wireless power supply system 1B, 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, and the control unit 300 can select a 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 acquired from each of the repeaters 200A and 200B. Thus, according to the wireless power supply system 1B, power can be efficiently supplied to the device 400 by selecting a transmitter 100 to supply power to the repeater 200 according to the power supply conditions, such as the congestion level of each transmitter 100, the congestion level of each repeater 200, and the charge level of the battery built into the device 400 or the amount of power required for the operation of the device 400.

[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 the 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. In addition, "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 program may be for the purpose of realizing some of the functions described above, or it may be for the purpose of realizing the above functions in combination with a program already recorded in the computer system, or it may be for the purpose of realizing using a programmable logic device such as an FPGA (Field Programmable Gate Array).

[0041] Although various embodiments and modifications have been described, these are merely examples and the invention is not limited to them. For example, one embodiment or modification, or a part of one embodiment or modification, may be combined with one or more other embodiments or modifications to realize one aspect of the present invention. For example, as described in the first and third embodiments, the control unit 300 may select a power transmission unit 100 to supply power to the repeaters 200 and a repeater 200 to supply power to the equipment 400, based on the congestion level of each repeater 200 and the congestion level of each power transmission unit 100. Furthermore, as described in the second embodiment, the control unit 300 may control the amount of power supplied from the power transmission unit 100 to each of the repeaters 200 based on the congestion level of each repeater 200.

[0042] 1, 1A, 1B Wireless power supply system 100 Transmitter 200 Repeater 300 Control unit 310 Server device 400 Equipment

Claims

1. A wireless power supply system comprising: a power transmitter that transmits radio waves; a relay unit 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 unit acquires equipment information relating to a first equipment that it is supplying power to; the control unit calculates the congestion level for each relay unit based on the equipment information for each relay unit, and selects a relay unit to supply power to a second equipment based on the congestion level.

2. The wireless power supply system according to claim 1, wherein the power transmitter performs beamforming processing to transmit radio waves from itself to each of the multiple relays, and the relays perform beamforming processing to transmit radio waves from themselves to each of the multiple devices.

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 wireless power supply system comprising: a power transmitter that transmits radio waves; a plurality of relay units that receive power from the radio waves transmitted from the power transmitter and transmit radio waves to supply power to equipment; and a control unit that controls the power supply to the equipment, wherein each of the relay units acquires equipment information relating to the equipment it is supplying power to; the control unit calculates the congestion level for each of the relay units 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.

5. The wireless power supply system according to claim 4, wherein each of the relay units acquires the charge amount of the battery built into its device or the amount of power supplied to the device, and 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 amount of the battery built into each of the relay units or the amount of power supplied to the device.

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

7. The wireless power supply system according to any one of claims 4 to 6, wherein the power transmitter performs beamforming processing to transmit radio waves from itself to each of the multiple relays, and the relays perform broadcast processing to transmit radio waves from themselves to each of the multiple devices.

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. A wireless power supply system comprising: a plurality of power transmitters that transmit radio waves; a relay that receives power from radio waves transmitted from at least one of the power 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 power transmitters acquires relay information relating to the relay that transmits radio waves by its own device; the relay acquires equipment information relating to the equipment that it supplies power to; and the control unit calculates a congestion level for each power transmitter based on the relay information and equipment information for each power transmitter, and selects a power transmitter to supply power to the relay based on the congestion level.

10. The wireless power supply system according to claim 9, wherein the control unit calculates the congestion level 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 congestion level for each repeater in addition to the congestion level for each power transmitter.

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

12. The wireless power supply system according to any one of claims 9 to 11, wherein each of the power transmitters performs beamforming processing to transmit radio waves from its own device to each of the plurality of relay devices, and each of the relay devices performs broadcast processing to transmit radio waves from its own device to each of the plurality of devices.

13. The 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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