Non-contact power supply system

Abstract

To provide a non-contact power feeding system capable of determining a power receiving device to which power can be efficiently supplied by a power transmitting device from among a plurality of power receiving devices.SOLUTION: A non-contact power feeding system 1 includes a plurality of power receiving devices 20, and a power transmitting device 10. The power receiving devices 20 each have a communication unit 22 that transmits a beacon signal, and an antenna 21 that receives power from the power transmitting device 10 in a non-contact manner. The power transmitting device 10 has a communication unit 12 that receives the beacon signal from the power receiving devices 20, and an antenna 11 that feeds power to the power receiving devices 20 in a non-contact manner. The non-contact power feeding system 1 also includes a determining unit 310 that determines the power receiving device 20 to be fed by the power transmitting device 10 from among the plurality of power receiving devices 20 for which the communication unit 12 has received the beacon signal, based on efficiency conditions under which the power transmitting device 10 can efficiently feed power to the power receiving devices 20. The antenna 11 feeds power to the power receiving device 20 determined by the determining unit 310.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a contactless power supply system. [Background technology]

[0002] Conventionally, a technique relating to contactless power supply using a power transmission signal is known (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6725531 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology disclosed in Patent Document 1, a power receiving device transmits a beacon signal to a power transmitting device requesting power supply. Then, the power transmitting device supplies power to the power receiving device based on the received beacon signal. Here, when multiple power receiving devices transmit beacon signals to a power transmitting device and the power transmitting device supplies power to multiple power receiving devices, the power transmission signals for each power receiving device may interfere with each other, making it difficult to supply power efficiently. Also, depending on the orientation of the power receiving device relative to the power transmitting device and the distance of the power receiving device, it may be difficult for the power transmitting device to efficiently supply power to all of the multiple power receiving devices. [Means for solving the problem]

[0005] A contactless power supply system that achieves the above-mentioned objective is a contactless power supply system comprising a plurality of power receiving devices and a power transmitting device, wherein the power receiving device has a transmitting unit that transmits a beacon signal to the power transmitting device requesting power supply, and a power receiving unit that receives power from the power transmitting device via contactless power supply, the power transmitting device has a receiving unit that receives the beacon signal from the power receiving device, and a power supply unit that supplies power to the power receiving device via contactless power supply, and further comprises a determination unit that determines, based on efficiency condition information indicating efficiency conditions under which the power transmitting device can efficiently supply power to the power receiving device, a power receiving device that satisfies the efficiency conditions among the plurality of power receiving devices from which the receiver unit receives the beacon signal, as the power receiving device to be supplied with power by the power transmitting device, and the power supply unit supplies power to the power receiving device determined by the determination unit.

[0006] According to the above configuration, it is possible to determine, from among a plurality of power receiving devices, a power receiving device to which the power transmitting device can efficiently supply power. In the above-mentioned contactless power supply system, the efficiency condition includes that the loss of the power supplied by the power transmission device to the power receiving device is small until it is received by the power receiving device, and the determination unit may determine, among the multiple power receiving devices, the power receiving device having smaller loss compared to the other power receiving devices as the power receiving device to which the power transmission device will supply power, based on the power supply power supplied by the power transmission device to the power receiving device and the power received by the power receiving device from the power transmission device.

[0007] According to the above configuration, it is possible to determine, from among a plurality of power receiving devices, a power receiving device that has small loss when the power transmitting device efficiently supplies power. In the above-mentioned contactless power supply system, the efficiency condition may include a strong reception strength of the beacon signal, and the determination unit may determine the power receiving device that transmitted a beacon signal having a stronger reception strength than other beacon signals among the beacon signals received by the receiving unit as the power receiving device to be supplied with power by the power transmitting device.

[0008] According to the above configuration, it is possible to determine, from among a plurality of power receiving devices, a power receiving device that is in the vicinity so that the power transmitting device can efficiently supply power thereto. In the above-mentioned contactless power supply system, the efficiency condition includes a match between an angle of arrival of the beacon signal and a directivity of the receiving unit, and the determination unit may determine, as the power receiving device to be supplied with power by the power transmitting device, the power receiving device that transmitted a beacon signal whose angle of arrival of the beacon signal matches the directivity compared to other beacon signals among the beacon signals received by the receiving unit.

[0009] According to the above configuration, among a plurality of power receiving devices, a power receiving device to which the power transmitting device can efficiently supply power can be determined by matching the power supply direction of the power transmitting device with the position at which the power receiving device is located. Effect of the Invention

[0010] According to the present invention, it is possible to determine, from among a plurality of power receiving devices, a power receiving device to which a power transmitting device can efficiently supply power. [Brief description of the drawings]

[0011] [Figure 1] 1 is a diagram illustrating an example of an overall configuration of a contactless power supply system. [Diagram 2] FIG. 1 is a diagram illustrating an example of a configuration of a contactless power supply system. [Diagram 3] 13 is a flowchart illustrating an example of a determination process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] <Embodiment> DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of a contactless power supply system will be described with reference to the drawings. [Overall configuration of non-contact power supply system 1] As shown in FIG. 1, the contactless power supply system 1 includes a power transmission device 10, a plurality of power receiving devices 20, and a control device 30. The power transmission device 10 supplies power to the power receiving device 20 by contactless power supply using a power transmission signal, for example. In detail, the contactless power supply system 1 performs wireless power transmission using a microwave method for contactless power supply. That is, the power transmission device 10 and the power receiving device 20 transmit and receive a power transmission signal for contactless power supply between a power receiving antenna of the power receiving device 20 and a power transmitting antenna of the power transmission device 10. Note that the wireless power transmission method (contactless power transmission method) applied to this system is not limited to the microwave method, and may be a method using an electromagnetic induction method, a magnetic field resonance method, an electric field resonance method, a laser, or the like. In addition, in this embodiment, the transmission and reception of the power transmission signal is used for contactless power supply, but the transmission and reception of the power transmission signal may be performed wirelessly for purposes other than contactless power supply.

[0013] The power receiving device 20 receives a power transmission signal transmitted from the power transmitting device 10, and operates using the received power or charges a battery provided in the power receiving device 20. The control device 30 controls the power supply to the power receiving device 20 by the power transmitting device 10.

[0014] Here, in order to appropriately transmit a power transmission signal to the power receiving device 20, the power transmitting device 10 is required to appropriately set the phase of the power transmission signal to be transmitted based on the orientation of the power receiving device 20 with respect to the power transmitting device 10 and the distance to the power receiving device 20. Accordingly, the power receiving device 20 transmits a beacon signal including phase change information to the power transmitting device 10 requesting power supply at predetermined time intervals. The power transmitting device 10 supplies power to the power receiving device 20 based on the phase change information included in the beacon signal received from the power receiving device 20.

[0015] On the other hand, when a plurality of power receiving devices 20 transmit beacon signals to the power transmitting device 10 and the power transmitting device 10 supplies power to the plurality of power receiving devices 20, the power transmission signals for the respective power receiving devices 20 may interfere with each other, making it difficult to supply power efficiently. Also, depending on the orientation of the power receiving device 20 relative to the power transmitting device 10 and the distance of the power receiving device 20, it may be difficult for the power transmitting device 10 to supply power efficiently to all of the plurality of power receiving devices 20.

[0016] When the power transmitting device 10 receives beacon signals from a plurality of power receiving devices 20, the control device 30 of the present embodiment determines the power receiving device 20 to which the power transmitting device 10 can efficiently supply power. Hereinafter, the configurations of the power transmitting device 10, the power receiving device 20, and the control device 30 will be described in detail.

[0017] [Configuration of power transmission device 10] As shown in FIG. 2, the power transmitting device 10 includes, for example, an antenna 11, a communication unit 12, a conversion unit 13, a battery 14, and a control unit 15.

[0018] The antenna 11 is used for various types of communication with the power receiving device 20. The antenna 11 is shared, for example, for communication related to power transmission signals, communication related to beacon signals, and information communication related to transmission and reception of various types of information. The antenna 11 is an example of a "power supply unit," and the transmission of a power transmission signal by the antenna 11 to the power receiving device 20 is an example of "supplying power to the power receiving device 20 by contactless power supply."

[0019] The communication unit 12 performs various controls related to communication with the power receiving device 20. For example, the communication unit 12 controls the antenna 11 and receives a beacon signal transmitted by the power receiving device 20. The communication unit 12 also controls the antenna 11 and transmits and receives various information to and from the power receiving device 20. Information communication related to the transmission and reception of various information is realized by, for example, Bluetooth (registered trademark), Wi-Fi, ZigBee (registered trademark), etc. The communication unit 12 is an example of a "receiving unit" in the process of controlling the antenna 11 and receiving a beacon signal from the power receiving device 20.

[0020] When supplying power to the power receiving device 20, the conversion unit 13 converts power into a power transmission signal and transmits it by the antenna 11. The conversion unit 13 may convert power supplied from a power source (not shown) into a power transmission signal, or may convert power stored in a battery 14 (described later) into a power transmission signal. In the following description, a case will be described in which the conversion unit 13 converts power stored in the battery 14 into a power transmission signal.

[0021] The battery 14 stores power supplied from a power source (not shown). The power capacity of the battery 14 when fully charged is, for example, a power capacity capable of supplying sufficient power to the power receiving device 20 included in the contactless power supply system 1.

[0022] The control unit 15 controls each unit included in the power transmitting device 10. The control unit 15 is realized, for example, by a hardware processor such as a CPU (Central Processing Unit) executing a program (software). In addition, some or all of these components may be realized by hardware (including circuitry) such as an LSI (Large Scale Integration), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a GPU (Graphics Processing Unit), or may be realized by cooperation between software and hardware. The program may be stored in advance in a storage device (not shown) including a non-transitory storage medium such as an HDD (Hard Disk Drive) or a flash memory included in the power transmitting device 10. The control unit 15 adjusts the phase of the antenna 11 based on, for example, a beacon signal received by the communication unit 12.

[0023] [Configuration of power receiving device 20] The power receiving device 20 includes an antenna 21 , a communication unit 22 , a conversion unit 23 , a battery 24 , and a control unit 25 .

[0024] The antenna 21 is used for various communications with the power transmitting device 10. The antenna 21 is shared, for example, for communications related to power transmission signals, communications related to beacon signals, and information communications related to transmission and reception of various information. The antenna 21 is an example of a "power receiving unit," and the reception by the antenna 21 of a power transmission signal transmitted by the power transmitting device 10 is an example of "receiving power from the power transmitting device 10 by contactless power supply."

[0025] The communication unit 22 performs various controls related to communication with the power transmitting device 10. For example, the communication unit 22 controls the antenna 21 to transmit a beacon signal to the power transmitting device 10 requesting power supply. The communication unit 22 also controls the antenna 21 to transmit and receive various information to and from the power transmitting device 10. The communication unit 22 is an example of a "transmitter" in the process of controlling the antenna 21 and transmitting a beacon signal to the power transmitting device 10.

[0026] The converter 23 converts the power transmission signal received by the antenna 21 into DC power. The battery 24 stores the DC power converted by the converter 23. The power receiving device 20 operates using the power stored in the battery 24.

[0027] The control unit 25 controls each unit included in the power receiving device 20. The control unit 25 is realized, for example, by a hardware processor such as a CPU executing a program (software). In addition, some or all of these components may be realized by hardware (including a circuit unit) such as an LSI, ASIC, FPGA, or GPU, or may be realized by a combination of software and hardware. The program may be stored in advance in a non-transitory storage medium such as an HDD or flash memory included in the power receiving device 20. For example, the control unit 25 instructs the communication unit 22 to transmit a beacon signal to the power transmitting device 10 at predetermined time intervals.

[0028] [Configuration of control device 30] The control device 30 of the present embodiment is connected to the power transmission device 10 so as to be able to transmit and receive information. The control device 30 and the power transmission device 10 may be directly connected to each other, or information communication related to the transmission and reception of various information may be performed by a communication unit (not shown).

[0029] The control device 30 includes a control unit 31 and a storage unit 40. The control unit 31 is realized, for example, by a hardware processor such as a CPU executing a program (software). Some or all of these components may be realized by hardware (including a circuit unit) such as an LSI, ASIC, FPGA, or GPU, or may be realized by a combination of software and hardware. The program may be stored in advance in the storage unit 40, which includes a non-transitory storage medium such as an HDD or flash memory provided in the control device 30.

[0030] The storage unit 40 may be realized by the various storage devices described above, or an EEPROM (Electrically Erasable Programmable Read Only Memory), a ROM (Read Only Memory), a RAM (Random Access Memory), or the like. In addition to the above-mentioned programs, the storage unit 40 stores efficiency condition information 401. The efficiency condition information 401 is information indicating efficiency conditions used in a process in which the control device 30 determines the power receiving device 20 to which power can be efficiently supplied.

[0031] In this example, a case will be described in which the efficiency condition information 401 includes information indicating three efficiency conditions: a first efficiency condition EC1, a second efficiency condition EC2, and a third efficiency condition EC3. The first efficiency condition EC1 is, for example, that the loss during the period from when the power transmitting device 10 supplies power to the power receiving device 20 until the power receiving device receives the power is small. The second efficiency condition EC2 is, for example, that the reception strength of the beacon signal is strong. The third efficiency condition EC3 is, for example, that the arrival angle of the beacon signal matches the directivity of the antenna 11.

[0032] The control unit 31 includes, for example, a determination unit 310. Based on the efficiency condition indicated in the efficiency condition information 401, the determination unit 310 determines, among the multiple power receiving devices 20 that have received a beacon signal, a power receiving device 20 that satisfies the efficiency condition as a power receiving device 20 to be supplied with power by the power transmitting device 10. The determination unit 310 instructs the power transmitting device 10 to supply power to the determined power receiving device 20. Based on the instruction of the control device 30, the power transmitting device 10 supplies power to the power receiving device 20 determined by the determination unit 310 among the multiple power receiving devices 20 that have received a beacon signal.

[0033] [Operation flow] Hereinafter, the details of the process of the determination unit 310 will be described with reference to Fig. 3. The process of the flowchart shown in Fig. 3 is executed when the power transmitting device 10 receives beacon signals from multiple power receiving devices 20. First, the determination unit 310 determines whether or not the efficiency condition is satisfied for each of the multiple power receiving devices 20 from which the power transmitting device 10 has received a beacon signal, based on the efficiency condition indicated in the efficiency condition information 401 (step S100).

[0034] When the determination unit 310 determines the power receiving device 20 based on the first efficiency condition EC1, the determination unit 310 acquires information indicating the received power in the power receiving device 20 and information indicating the supply power supplied by the power transmitting device 10 to the power receiving device 20 from the power transmitting device 10. In this case, the power transmitting device 10 transmits a power transmission signal to all of the power receiving devices 20 that have received the beacon signal, and supplies power. The antenna 21 of the power receiving device 20 receives the power transmission signal transmitted by the power transmitting device 10. The conversion unit 23 converts the power transmission signal received by the antenna 21 into DC power. The communication unit 22 of the power receiving device 20 transmits the magnitude of the DC power converted by the conversion unit 23 to the power transmitting device 10 as information indicating the received power. The communication unit 12 of the power transmitting device 10 outputs, to the control device 30, information indicating the received power transmitted by the power receiving device 20 and information indicating the supply power supplied by the power transmitting device 10 to the power receiving device 20.

[0035] The determination unit 310 compares information indicating the received power obtained from each power receiving device 20 with information indicating the power supplied by the power transmitting device 10 to the power receiving device 20, and determines the power receiving device 20 whose loss of received power is smaller than that of the other power receiving devices 20 as the power receiving device 20 that satisfies the efficiency condition.

[0036] Furthermore, when determining the power receiving device 20 based on the second efficiency condition EC2, the determination unit 310 acquires information indicating the reception strength of the beacon signal received by the power transmitting device 10 from the power transmitting device 10. The determination unit 310 compares the information indicating the reception strength of the beacon signal received by the power transmitting device 10, and determines the power receiving device 20 having a stronger reception strength than the other power receiving devices 20 as the power receiving device 20 that satisfies the efficiency condition.

[0037] Furthermore, when determining the power receiving device 20 based on the third efficiency condition EC3, the determination unit 310 acquires, from the power transmitting device 10, information indicating the arrival angle of the beacon signal received by the power transmitting device 10 and information indicating the directivity of the antenna 11. The determination unit 310 compares the information indicating the arrival angle of the beacon signal received by the power transmitting device 10 with the directivity of the antenna 11, and determines the power receiving device 20 whose arrival angle of the beacon signal matches the directivity more than other power receiving devices 20 as the power receiving device 20 that satisfies the efficiency condition.

[0038] The determination unit 310 of this embodiment determines the power receiving device 20 that satisfies any one of the first efficiency condition EC1, the second efficiency condition EC2, and the third efficiency condition EC3 as the power receiving device 20 that satisfies the efficiency condition.

[0039] The determination unit 310 determines that the power transmitting device 10 will supply power to the power receiving devices 20 determined to satisfy the efficiency condition among the multiple power receiving devices 20 that have transmitted a beacon signal to the power transmitting device 10 (step S102). The determination unit 310 determines that the power transmitting device 10 will not supply power to the power receiving devices 20 determined not to satisfy the efficiency condition among the multiple power receiving devices 20 that have transmitted a beacon signal to the power transmitting device 10 (step S104). The power transmitting device 10 transmits a power transmission signal to the power receiving devices 20 determined to supply power based on the determination result of the determination unit 310, and does not transmit a power transmission signal to the power receiving devices 20 determined not to supply power.

[0040] [Effects of the embodiment] According to the above embodiment, the following advantageous effects can be obtained. (1) Based on the efficiency condition, the determination unit 310 determines the power receiving device 20 that satisfies the efficiency condition, from among the multiple power receiving devices 20 from which the power transmitting device 10 has received a beacon signal, as the power receiving device 20 to which the power transmitting device 10 will supply power.

[0041] According to this configuration, the power transmitting device 10 can supply power to a unique power receiving device 20 among the multiple power receiving devices 20 based on the determination of the determination unit 310. By supplying power to the unique power receiving device 20, the power transmitting device 10 can suppress interference in the power transmission signal compared to the case where power is supplied to all of the multiple power receiving devices 20, and can supply power to the power receiving device 20 efficiently.

[0042] (2) The efficiency condition includes a first efficiency condition EC1 indicating that the loss of power supplied from the power transmitting device 10 to the power receiving device 20 is small until the power receiving device 20 receives the power. The determination unit 310 compares the power supply power supplied from the power transmitting device 10 to the power receiving device 20 with the received power received by the power receiving device 20 from the power transmitting device 10. The determination unit 310 determines, among the multiple power receiving devices 20, a power receiving device 20 having a smaller loss than the other power receiving devices 20 as the power receiving device 20 to which the power transmitting device 10 will supply power. With this configuration, the power transmitting device 10 can efficiently supply power to the power receiving device 20 having a smaller loss, based on the determination of the determination unit 310.

[0043] (3) The efficiency condition includes a second efficiency condition EC2 indicating that the reception strength of the beacon signal is strong. The determination unit 310 determines the power receiving device 20 that transmits a beacon signal having a stronger reception strength than other beacon signals among the beacon signals received by the power transmitting device 10 as the power receiving device 20 to which the power transmitting device 10 supplies power. Here, the power receiving device 20 that transmits a beacon signal having a stronger reception strength may be located closer to the power transmitting device 10 than the other power receiving devices 20. In a case where the power receiving device 20 closer to the power transmitting device 10 is compared with a power receiving device 20 farther from the power transmitting device 10, the power receiving device 20 closer to the power transmitting device 10 may have a better power supply efficiency. With this configuration, the determination unit 310 can determine the power receiving device 20 that is located nearby among the multiple power receiving devices 20 and to which the power transmitting device 10 can efficiently supply power. Therefore, the power transmitting device 10 can efficiently supply power to the power receiving device 20.

[0044] (4) The efficiency condition includes a third efficiency condition EC3 indicating that the arrival angle of the beacon signal matches the directivity of the antenna 11. The determination unit 310 determines the power receiving device 20 that transmits a beacon signal whose arrival angle matches the directivity of the antenna 11 as the power receiving device 20 to be supplied with power by the power transmitting device 10, as compared to other beacon signals among the beacon signals received by the power transmitting device 10. Here, the power receiving device 20 that transmits a beacon signal whose arrival angle matches the antenna 11 of the power transmitting device 10 may be able to receive a power transmission signal from the power transmitting device 10 more efficiently than the other power receiving devices 20. With this configuration, the determination unit 310 can determine, among the multiple power receiving devices 20, the power receiving device 20 to which the power transmitting device 10 can efficiently supply power by matching the power supply direction of the power transmitting device 10 with the position where the power receiving device 20 is present. Therefore, the power transmitting device 10 can efficiently supply power to the power receiving device 20.

[0045] The above-described embodiments may be modified as follows: The above-described embodiments and the following examples may be combined with each other as long as they are not technically inconsistent. 1 shows an example in which the number of power receiving devices 20 included in the contactless power supply system 1 is two, but is not limited thereto. The number of power receiving devices 20 included in the contactless power supply system 1 may be one, or three or more. In addition, an upper limit may be set for the number of power receiving devices 20 included in the contactless power supply system 1. The upper limit for the number of power receiving devices 20 may be determined according to the power that the power transmitting device 10 included in the contactless power supply system 1 can supply, for example.

[0046] In the above description, the power transmitting device 10 is operated by power supplied from a power source (not shown), but this is not limited to the above. A plurality of contactless power supply systems 1 may be linked together, and the power transmitting device 10 may be supplied with power by a power transmission signal transmitted from a power transmitting device 10 included in another contactless power supply system 1 and operate.

[0047] In the above description, the efficiency condition information 401 includes two efficiency conditions, the first efficiency condition EC1 and the second efficiency condition EC2, but this is not limited to the above. The efficiency condition information 401 may include one efficiency condition, or four or more efficiency conditions.

[0048] Furthermore, when there are multiple efficiency conditions, a priority may be assigned to each efficiency condition. For example, the priority of the first efficiency condition EC1 may be set higher than the second efficiency condition EC2 and the third efficiency condition EC3. In this case, the determination unit 310 determines the power receiving device 20 that is determined to satisfy the first efficiency condition EC1 as the power receiving device 20 that satisfies the efficiency conditions, regardless of whether the power receiving device 20 satisfies the second efficiency condition EC2 and the third efficiency condition EC3.

[0049] ○When there are multiple power receiving devices 20 that satisfy any one of the efficiency conditions, the determination unit 310 may determine, among the multiple power receiving devices 20, the power receiving device 20 that satisfies the efficiency condition that is assigned a higher priority as the power receiving device 20 that satisfies the efficiency condition.

[0050] In the above description, the determination unit 310 determines the power receiving device 20 that satisfies any one of the first efficiency condition EC1, the second efficiency condition EC2, and the third efficiency condition EC3 as the power receiving device 20 that satisfies the efficiency conditions, but this is not limited to the above. The determination unit 310 may determine the power receiving device 20 that satisfies any one of the first efficiency condition EC1, the second efficiency condition EC2, and the third efficiency condition EC3 as the power receiving device 20 that satisfies the efficiency conditions.

[0051] In the above description, the power transmitting device 10 and the control device 30 are provided separately, but the present invention is not limited to this. The power transmitting device 10 may have the function of the control device 30, for example. In this case, the efficiency condition information 401 is stored in the storage device of the power transmitting device 10, and the control unit 15 of the power transmitting device 10 includes the determination unit 310. In addition, when the wireless power supply system 1 includes a plurality of power transmitting devices 10, the plurality of power transmitting devices 10 may transmit and receive information indicating the power receiving devices 20 that satisfy the efficiency condition determined by information communication with each other, and may integrally determine the power receiving devices 20 to which each of the power transmitting devices 10 supplies power. In detail, when the power receiving devices 20 that some or all of the power transmitting devices 10 have determined to supply power match among the plurality of power transmitting devices 10, the power transmitting device 10 with the highest priority supplies power to the power receiving device 20 that has been determined to supply power, based on the priority assigned to the power transmitting device 10.

[0052] In the above description, the antenna 11 and the antenna 21 are shared for the communication related to the power transmission signal, the communication related to the beacon signal, and the information communication related to the transmission and reception of various information, but the present invention is not limited to this. The power transmitting device 10 and the power receiving device 20 may have separate antennas for the communication related to the power transmission signal, the communication related to the beacon signal, and the information communication related to the transmission and reception of various information. For example, if the information communication related to the transmission and reception of various information is frequently performed between the power transmitting device 10 and the power receiving device 20, the antenna 11 and the antenna 21 may not be able to properly transmit and receive the power transmission signal or the beacon signal. The power transmitting device 10 and the power receiving device 20 have separate antennas for the communication related to the power transmission signal, the communication related to the beacon signal, and the information communication related to the transmission and reception of various information, thereby preventing one communication from interfering with the other communication. [Explanation of symbols]

[0053] 1. Wireless power supply system 10...Power transmission device 20...Power receiving device 30...Control device 11,21…Antenna 12,22…Communications Department 13,23…Conversion section 14,24…Battery 15, 25, 31...Control section 40...Storage section 310…Decision-making department 401...Efficiency condition information EC1: First efficiency condition EC2: Second efficiency condition EC3...Third efficiency condition.

Claims

1. A wireless power supply system including a plurality of power receiving devices and a power transmitting device, The power receiving device is A transmission unit that transmits a beacon signal to the power transmitting device that requests power supply; a power receiving unit that receives power from the power transmitting device by non-contact power feeding, The power transmitting device is a receiving unit that receives the beacon signal from the power receiving device; a power supply unit that supplies power to the power receiving device by non-contact power supply; a determination unit that determines, based on efficiency condition information indicating an efficiency condition under which the power transmitting device can efficiently supply power to the power receiving device, a power receiving device that satisfies the efficiency condition among the power receiving devices from which the receiving unit has received the beacon signal, as the power receiving device to be supplied with power by the power transmitting device; the power supply unit supplies power to the power receiving device determined by the determination unit; the efficiency condition includes that the reception strength of the beacon signal is strong; The determination unit determines, as the power receiving device to be supplied with power by the power transmitting device, the power receiving device that has transmitted a beacon signal having a stronger reception strength than other beacon signals among the beacon signals received by the receiving unit. A non-contact power supply system comprising:

2. A wireless power supply system including a plurality of power receiving devices and a power transmitting device, The power receiving device is A transmission unit that transmits a beacon signal to the power transmitting device that requests power supply; a power receiving unit that receives power from the power transmitting device by non-contact power feeding, The power transmitting device is a receiving unit that receives the beacon signal from the power receiving device; a power supply unit that supplies power to the power receiving device by non-contact power supply; a determination unit that determines, based on efficiency condition information indicating an efficiency condition under which the power transmitting device can efficiently supply power to the power receiving device, a power receiving device that satisfies the efficiency condition among the power receiving devices from which the receiving unit has received the beacon signal, as the power receiving device to be supplied with power by the power transmitting device; the power supply unit supplies power to the power receiving device determined by the determination unit; The efficiency condition includes that an arrival angle of the beacon signal matches a directivity of the receiving unit; The determination unit determines, as the power receiving device to be supplied with power by the power transmitting device, the power receiving device that has transmitted a beacon signal whose arrival angle matches the directivity compared to other beacon signals among the beacon signals received by the receiving unit. A non-contact power supply system comprising:

3. the efficiency condition includes that a loss of power supplied from the power transmitting device to the power receiving device is small until the power is received by the power receiving device; the determination unit determines, among the plurality of power receiving devices, a power receiving device having a smaller loss than the other power receiving devices as the power receiving device to which the power transmitting device will supply power, based on the power supply power supplied by the power transmitting device to the power receiving device and the power received by the power receiving device from the power transmitting device. The contactless power supply system according to claim 1 or 2.

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