WO2019065222A1

WO2019065222A1 - Power transmitter, power transmitter control method, power receiver, and wireless power transmission system

Info

Publication number: WO2019065222A1
Application number: PCT/JP2018/033699
Authority: WO
Inventors: 裕也田中
Original assignee: 京セラ株式会社
Priority date: 2017-09-27
Filing date: 2018-09-11
Publication date: 2019-04-04
Also published as: JP2019062701A; JP6602356B2

Abstract

This power transmitter is provided with: a power transmission unit which emits first radio waves used for wireless power transmission; a communication unit which receives second radio waves; and a control unit. The control unit, upon receipt by the communication unit of second radio waves including a power transmission request from a power receiver, determines whether the power receiver has a right to receive wireless power transmission on the basis of a power receiver identifier included in the power transmission request. The control unit, upon determining that the power receiver has the right, performs beam control for increasing the intensity of the first radio waves that reach the power receiver. The control unit, upon determining that the power receiver does not have the right, performs null control for decreasing the intensity of the first radio waves that reach the power receiver.

Description

Power transmitter, control method of power transmitter, power receiver, and wireless power transmission system

Cross-reference to related applications

This application claims the priority of Japanese Patent Application No. 2017-187114, filed on Sep. 27, 2017, the entire disclosure of which is incorporated herein by reference.

The present disclosure relates to a transmitter, a control method of the transmitter, a receiver, and a wireless power transmission system.

2. Description of the Related Art Conventionally, techniques for supplying power to electronic devices using radio waves are known. For example, Patent Document 1 discloses a wireless power transmission system that controls a position of a non-electric power supply target such as a human body or a metal can to be a power null point.

JP, 2012-055146, A

A power transmitter according to an embodiment of the present disclosure includes a power transmission unit that emits a first radio wave used for wireless power transmission, a communication unit that receives a second radio wave, and a control unit. When the control unit receives the second radio wave including the power transmission request from the power receiver by the communication unit, the control unit has the right to receive the wireless power transmission based on the identifier of the power receiver included in the power transmission request. It is determined whether or not. When it is determined that the power receiving device has the right, the control unit performs beam control to increase the intensity of the first radio wave that reaches the power receiving device. When it is determined that the power receiver does not have the right, the control unit performs null control to weaken the intensity of the first radio wave reaching the power receiver.

A control method according to an embodiment of the present disclosure is a control method of a power transmission device including a power transmission unit that emits a first radio wave used for wireless power transmission and a communication unit that receives a second radio wave. In the control method, when the second radio wave including a power transmission request is received from the power receiver by the communication unit, the power receiver has the right to receive the wireless power transmission based on the identifier of the power receiver included in the power transmission request. Determining whether or not it is determined. The control method includes the step of performing beam control to increase the intensity of the first radio wave reaching the power receiver, when it is determined that the power receiver has the right. The control method includes the step of performing null control to weaken the intensity of the first radio wave reaching the power receiver when it is determined that the power receiver does not have the right.

A power receiver according to an embodiment of the present disclosure includes a storage unit that stores an identifier that uniquely identifies the power receiver, a power reception unit that receives a first radio wave used for wireless power transmission, and a communication unit that emits a second radio wave. , And a controller. The control unit creates a power transmission request and a tracking signal including the identifier. The control unit radiates the second radio wave including the power transmission request to the power transmitter by the communication unit. When the power receiving unit receives the first radio wave including a power transmission response from the power transmitter, the control unit emits the second radio wave including the tracking signal to the power transmitter from the communication unit.

A wireless power transmission system according to an embodiment of the present disclosure radiates a first radio wave used for wireless power transmission, receives a second radio wave, and receives the first radio wave, and receives the second radio wave. And an electric machine. When the power transmitter receives the second radio wave including the power transmission request from the power receiver, it is determined whether the power receiver has the right to receive the wireless power transmission based on the identifier of the power receiver included in the power transmission request. judge. When it is determined that the power receiver has the right, the power transmitter performs beam control to increase the intensity of the first radio wave that reaches the power receiver. When it is determined that the power receiver does not have the right, the power transmitter performs null control to weaken the intensity of the first radio wave reaching the power receiver.

It is a figure showing a schematic structure of a wireless power transmission system concerning an embodiment of this indication. It is a functional block diagram which shows schematic structure of the wireless power transmission system of FIG. It is an example of the list of the receiving devices which the power transmitting device of FIG. 2 has. It is a sequence diagram which shows an example of the power transmission procedure of the wireless power transmission system of FIG. It is a flowchart which shows an example of the process which the power transmission machine of FIG. 2 performs. It is a flowchart which shows an example of the process which the call receiver of FIG. 2 performs.

The present disclosure relates to providing a transmitter, a method of controlling a power transmitter, a power receiver, and a wireless power transmission system, which improves the usefulness of a technology for supplying power to an electronic device using radio waves. According to the power transmitter, the power transmitter control method, the power receiver, and the wireless power transmission system according to the embodiment of the present disclosure, the usefulness of the technology for supplying power to the electronic device using radio waves is improved. Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of a wireless power transmission system 1 according to an embodiment of the present disclosure. The wireless power transmission system 1 includes a power transmitter 10 and one or more power receivers 20. In the wireless power transmission system 1, the power transmitter 10 performs wireless power transmission in which power is transmitted to the power receiver 20 by radio waves. Wireless power transmission is also referred to as radio wave feeding or wireless feeding. Although FIG. 1 illustrates the wireless power transmission system 1 including the three power receivers 20 of the

power receivers

20A, 20B, and 20C as an example, the number of the power receivers 20 may be arbitrarily determined.

FIG. 2 is a functional block diagram showing a schematic configuration of the wireless power transmission system 1. As described above, the wireless power transmission system 1 includes the transmitter 10 and the three

power receivers

20A, 20B, and 20C. Hereinafter, the

power receivers

20A, 20B, and 20C will be simply referred to as the power receiver 20 unless otherwise specified.

The power transmitter 10 is, for example, a home gateway and a wireless power transmission device. The power transmitter 10 supplies power to the power receiver 20 using an electromagnetic wave. In the present embodiment, the power transmitter 10 may supply power to the power receiver 20 by radiation type wireless power transmission using radio waves such as microwaves. Specifically, the power transmitter 10 generates a radio wave for power supply. The power transmitter 10 radiates the generated radio wave to the power receiver 20.

The power transmitter 10 includes a power transmission unit 11, a communication unit 12, a storage unit 13, a storage battery 14, and a control unit 15.

The power transmission unit 11 transmits wireless power. Specifically, based on the control of the control unit 15, the power transmission unit 11 transmits wireless power by, for example, radiating electric power supplied from a power supply such as a distribution facility as radio waves.

The power transmission unit 11 includes an antenna 11A and an oscillator 11B. The oscillator 11B transmits wireless power by radiating radio waves for wireless power transmission from the antenna 11A to the power receiver 20 based on the power supplied from the power supply. There may be a plurality of antennas 11A. By performing beam forming control using the plurality of antennas 11A, the directivity of the radio wave to be emitted is enhanced. Furthermore, the power transmission unit 11 performs beam control to increase the intensity of radio waves reaching a specific position and null control to weaken the intensity of radio waves reaching a specific position. For example, as illustrated in FIG. 1, the power transmission unit 11 performs wireless power transmission so as to increase the intensity of radio waves reaching the

power receivers

20A and 20B by beam control and weaken the intensity of radio waves reaching the power receiver 20C by null control. Can emit radio waves for

The communication unit 12 performs wireless communication with an external device based on the control of the control unit 15. In the present embodiment, the communication unit 12 communicates with the power receiver 20. The power transmitter 10 may perform wireless communication using the antenna 11 </ b> A of the power transmission unit 11 instead of the communication unit 12. The communication unit 12 may transmit, to the power receiver 20, information related to wireless power transmission such as a beacon and a power transmission response to a request for wireless power transmission. The communication unit 12 may also receive, from the power receiver 20, information regarding wireless power transmission, such as a request for wireless power transmission and a tracking signal for notifying the position of the power receiver 20.

In the present specification, a radio wave radiated from the power transmitter 10 to the receiver 20 and used for the above-described wireless power transmission and wireless communication is referred to as a first radio wave. For example, radio waves in a frequency band such as 2.4 GHz band or 5.6 to 5.8 GHz band may be used as the first radio wave.

The storage unit 13 stores information used for processing of the power transmitter 10, a program in which processing contents for realizing each function of the power transmitter 10 are described, and the like. The storage unit 13 may also function as a work memory. In the present embodiment, the storage unit 23 stores, for example, information regarding the presence or absence of the right to receive wireless power transmission of the power receiver 20 described later, as shown in FIG.

The storage battery 14 can store power supplied from a power supply.

The control unit 15 is one or more processors that control and manage the entire function of the power transmitter 10, including each function of the power transmitter 10. The control unit 15 may be configured of a processor such as a CPU (Central Processing Unit) that executes a program defining a control procedure, or a dedicated processor specialized for the processing of each function.

When the control unit 15 receives the second radio wave including the power transmission request from the power receiver 20 by the communication unit 12, the control unit 15 determines whether the power receiver 20 has the right to receive wireless power transmission based on the identifier of the power receiver 20 included in the power transmission request. Determine if The power transmission request includes at least an identifier for uniquely identifying the receiver 20. As an identifier, a serial number, an individual identification number, or a mobile number or a user ID provided by a service provider such as a mobile phone or wireless power transmission may be used as the identifier. As illustrated in FIG. 3, the control unit 27 may store the identifier of the power receiver 20 and the right to receive wireless power in the storage unit 13 in association with each other. The control unit 27 compares the identifier of the power receiver 20 included in the power transmission request with the information stored in the storage unit 13 and determines whether the power receiver 20 has the right to receive wireless power transmission.

When the control unit 15 determines that the power receiver 20 has the right to receive wireless power transmission, the control unit 15 controls the first radio wave emitted from the power transmission unit 11 to strengthen the intensity of the first radio wave reaching the power receiver 20 Perform beam control. In addition, when the control unit 15 determines that the power receiver 20 does not have the right to receive wireless power transmission, the control unit 15 performs null control to weaken the intensity of the first radio wave reaching the power receiver 20. The control unit 15 may simultaneously perform different controls on the plurality of power receivers 20. For example, when the control unit 15 receives a power transmission request from the

power receivers

20A and 20B and determines that only the power receiver 20A has the right to receive wireless power transmission, it performs beam control on the power receiver 20A, and at the same time, Null control may be performed on the power receiver 20B. By these controls, it is possible to suppress the occurrence of leaked radio waves due to power being transmitted to an unauthorized power receiver, and to improve the power transmission efficiency of wireless power transmission to a power receiver to be transmitted.

The control unit 15 receives a second radio wave including a follow-up signal described later from the power receiver 20, and performs beam control or null control of the first radio wave on the power receiver 20 by specifying the position of the power receiver 20. May be The control unit 15 may determine whether to perform beam control of the first radio wave to the power receiver 20 or to perform null control based on the information included in the received tracking signal. The control unit 15 may also determine whether to perform beam control of the first radio wave on the power receiver 20 or perform null control based on the time interval for receiving the follow-up signal. As a result, even if the power receiver 20 moves within the range in which the first radio wave can be received after the beam control of the first radio wave or the null control is started, the control unit 15 performs the first operation on the power receiver 20. Radio beam control or null control can be continued.

If the control unit 15 determines that the power receiver 20 has the right to receive wireless power transmission, the control unit 15 may transmit a first radio wave including a power transmission response from the communication unit 12 to the power receiver 20. The power transmission response may include information indicating that the wireless power transmission request has been accepted, information for uniquely identifying the power transmitter 10, or any information such as connection information and password used for wireless power transmission. . The power receiver 20 can determine that the power transmission request transmitted by the power receiver 20 has been received by receiving the first radio wave including the power transmission response. The control unit 15 transmits the first radio wave including the power transmission response from the communication unit 12 to the power receiver 20, and then reaches the power receiver 20 by controlling the first radio wave emitted from the power transmission unit 11. 1 Beam control may be performed to increase the intensity of radio waves. The control unit 15 reaches the power receiver 20 by controlling the first radio wave emitted from the power transmission unit 11 at the same time as transmitting the first radio wave including the power transmission response from the communication unit 12 to the power receiver 20. The beam control may be performed to increase the intensity of the first radio wave.

If the control unit 15 determines that the power receiver 20 having the right to receive wireless power transmission does not exist within the range in which wireless power transmission is possible, the control unit 15 does not have to emit the first radio wave from the power transmission unit 11. The control unit 15 may determine that the power receiver 20 having the right does not exist within the range in which wireless power transmission is possible, by an arbitrary method. For example, the control unit 15 performs processing of acquiring information of RFID (Radio Frequency Identification) included in the power receiver 20 using the first radio wave, and based on the result, within the range where wireless power transmission is possible, It may be determined that the power receiver 20 having the right does not exist. In addition, when the control unit 15 does not receive the second radio wave from the power receiver 20 by the communication unit 12 with a strength equal to or higher than a predetermined value, the power receiver 20 having the right does not exist within the range where wireless power transmission is possible. You may judge. When the control unit 15 determines that the power receiving unit 20 having the right to receive wireless power transmission does not exist in the state where the power transmission unit 11 radiates the first radio wave, the control unit 15 cancels the radiation of the first radio wave by the power transmission unit 11 . Further, when the control unit 15 determines that the power receiving unit 20 having the right to receive wireless power transmission does not exist in a state where the first power transmission unit 11 does not emit the first radio wave, the control unit 15 emits the first radio wave from the power transmission unit 11. Keep it out of the way.

If the control unit 15 determines that the power receiving device 20 does not have the right to receive wireless power transmission, if the wireless power transmission is performed to another power receiving device 20, the above-described null control is performed, and the other power receiving device 20 is On the other hand, when the wireless power transmission is not performed, the power transmission unit 11 may not emit the first radio wave. The control unit 15 may store, in the storage unit 13, a list of the power receivers 20 currently performing wireless power transmission in order to determine whether the wireless power transmission is performed to another power receiver 20. In addition, the control unit 15 may acquire the operating state of the power transmission unit 11 in order to determine whether or not wireless power transmission is performed to another power receiver 20.

The power receiver 20 is an electronic device such as a mobile phone, a smartphone, a tablet terminal, or a PC (Personal Computer), for example. The power receiver 20 receives wireless power from the power transmitter 10. Specifically, the power receiver 20 receives a radio wave for power supply from the power transmitter 10. The power receiver 20 converts the received radio waves into DC power. Thus, the power receiver 20 receives wireless power from the power transmitter 10.

The power receiver 20 includes a power reception unit 21, a communication unit 22, a storage unit 23, a storage battery 24, a notification unit 25, an input unit 26, and a control unit 27.

The power receiving unit 21 receives wireless power. Specifically, the power reception unit 21 receives wireless power by converting radio waves for wireless power transmission received from the outside into electric power based on the control of the control unit 27. The power receiving unit 21 supplies the generated power to the storage battery 24. The power generated by the power receiving unit 21 may be directly supplied to the power receiver 20 without being stored in the storage battery 24. In the present embodiment, the first radio wave for wireless power transmission emitted by the power transmitter 10 is used as the radio wave for wireless power transmission received from the outside.

The power receiving unit 21 includes an antenna 21A and a rectifier circuit 21B. The antenna 21A receives the above-described first radio wave for wireless power transmission from the power transmitter 10. The rectifier circuit 21B converts the first radio wave received by the antenna 21A into direct current power. The rectifier circuit 21 B supplies the converted direct current power to the storage battery 24. There may be a plurality of antennas 21A. By receiving radio waves using the plurality of antennas 21A, the strength of the received radio waves can be increased or noise can be reduced.

The communication unit 22 performs wireless communication with an external device based on the control of the control unit 27. The communication unit 22 communicates with, for example, the power transmitter 10. The power receiver 20 may perform wireless communication using the antenna 21A of the power receiving unit 21 instead of the communication unit 22. The communication unit 22 may transmit information on wireless power transmission such as a request for wireless power transmission and a tracking signal for notifying the position of the power receiver 20 to the power transmitter 10. The communication unit 22 may also receive, from the power transmitter 10, information on wireless power transmission such as a beacon and a response to a request for wireless power transmission.

In the present specification, a radio wave emitted from the power receiver 20 and used for wireless communication is referred to as a second radio wave. For example, as the second radio wave, a radio wave in a frequency band such as 700 MHz to 3.5 GHz band, 2.4 GHz band, or 5.6 to 5.8 GHz band may be used.

The storage unit 23 can be configured by a semiconductor memory, a magnetic memory, or the like. The storage unit 23 stores information used for processing of the power receiver 20 and a program or the like in which processing content for realizing each function of the power receiver 20 is described. The storage unit 23 may also function as a work memory. In the present embodiment, the storage unit 23 stores, for example, a first time interval, a second time interval, and the like for transmitting a tracking signal to be described later at a predetermined time interval.

The storage battery 24 stores power used for the operation of the power receiver 20. Storage battery 24 is electrically connected to power reception unit 21. Storage battery 24 can store the power received by power reception unit 21. The storage battery 24 can also store power supplied from devices other than the power transmission device 10. For example, the storage battery 24 can store power supplied from a power source such as an outlet.

The notification unit 25 notifies information by sound, vibration, an image, and the like. The notification unit 25 includes, for example, a speaker, a vibrator, a display device, and the like. The display device can be, for example, a liquid crystal display (LCD), an organic EL display (OELD: organic electro-luminescence display), an inorganic EL display (IELD: inorganic organic display), or the like. The notification unit 25 may notify, based on the control of the control unit 27, information on the remaining amount of the storage battery 24, information on wireless power transmission from the power transmitter 10, and the like.

The input unit 26 receives an input operation from the user. The input unit 26 includes, for example, a physical key such as a power button, an input device such as a touch panel provided integrally with the display device of the notification unit 25, and a pointing device such as a mouse. When operated by the user, the input unit 26 transmits the user operation to the control unit 27 as electronic information.

The control unit 27 is one or more processors that control and manage the entire functions of the power receiver 20, including the functions of the power receiver 20. The control unit 27 may be configured by a processor such as a CPU that executes a program defining a control procedure, or a dedicated processor specialized for processing of each function.

The control unit 27 causes the communication unit 22 to radiate the second radio wave including the power transmission request to the power transmitter 10. When the power reception unit 21 receives the first radio wave including the power transmission response from the power transmitter 10, the control unit 27 causes the communication unit 22 to emit the second radio wave including the tracking signal to the power transmission device 10. The follow-up signal may include any information for the transmitter 10 to determine the position information of the power receiver 20. The tracking signal may be, for example, a Wi-Fi (registered trademark) beacon. In the case of a Wi-Fi beacon, for example, the control unit 27 may emit a second radio wave in which the identifier of the power receiver 20 is set to the SSID (Service Set Identifier) to the power transmitter 10 from the communication unit 22.

When the control unit 27 receives the first radio wave including the power transmission response from the power transmitter 10 by the power reception unit 21, the communication unit 22 causes the transmission unit 10 to emit the second radio wave including the tracking signal at the first time interval. You may go. Further, when the power receiving unit 21 does not receive the first radio wave including the power transmission response from the power transmitter 10, the control unit 27 follows the power transmitting unit 10 by the communication unit 22 at a second time interval different from the first time interval. The second radio wave may be emitted including the signal for the second time. The control unit 27 may determine that the power reception unit 21 does not receive the first radio wave including the power transmission response from the power transmitter 10 by passing a predetermined period without receiving the first radio wave including the power transmission response. . In addition, the control unit 27 may determine that the power reception unit 21 does not receive the first radio wave including the power transmission response from the power transmitter 10 by receiving the first radio wave including the response different from the power transmission response. The first time interval and the second time interval may each be any time interval. For example, these time intervals may be set individually in consideration of the accuracy of specifying the position information, the power consumption required for transmitting the tracking signal, and the like. The power transmitter 10 performs beam control or null control of the first radio wave to the power receiver 20 by receiving the second radio wave including the tracking signal at the first time interval or the second time interval.

(Operation example of wireless power transmission system)
An example of processing performed by the wireless power transmission system 1 according to an embodiment of the present disclosure will be described with reference to FIG. 3 and FIG. 4. Here, as shown in FIG. 3, the power transmitter 10 is assumed to have information that the power receiver 20A has a right to receive wireless power transmission, and the power receiver 20B has no right to receive wireless power transmission. .

In FIG. 4, the power receiver 20 </ b> A emits a second radio wave including a power transmission request. The power transmission request includes an ID 000020A that is an identifier of the power receiver 20A. Upon receiving the second radio wave including the power transmission request, the power transmitter 10 acquires the identifier ID 0000020A included in the power transmission request. The power transmission device 10 determines that the power receiving device 20A has the right to receive wireless power transmission based on the identifier ID 0000020A. The power transmitter 10 radiates a first radio wave including a power transmission response to the power receiver 20A. The power transmitter 10 starts beam control to increase the intensity of the first radio wave reaching the power receiver 20A. When receiving the power transmission response, the power receiver 20A emits a second radio wave including a tracking signal at a first time interval. The power transmitter 10 specifies the position of the power receiver 20A based on the follow-up signal, and continues beam control to strengthen the intensity of the first radio wave reaching the power receiver 20A.

On the other hand, the power receiver 20C emits a second radio wave including a power transmission request. The power transmission request includes an ID 000020C that is an identifier of the power receiver 20C. Upon receiving the second radio wave including the power transmission request, the power transmitter 10 acquires the identifier ID 000020C included in the power transmission request. The power transmission device 10 determines that the power receiving device 20C does not have the right to receive wireless power transmission based on the identifier ID 0000020C. The transmitter 10 does not radiate the first radio wave including the power transmission response to the receiver 20C. The power transmitter 10 wirelessly transmits power to the power receiver 20A, and thus starts null control to weaken the intensity of the first radio wave reaching the power receiver 20C. If the power receiving device 20C does not receive the power transmission response, the power receiver 20C emits the second radio wave including the tracking signal at a second time interval. The power transmitter 10 specifies the position information of the power receiver 20C based on the follow-up signal, and continues null control to weaken the intensity of the first radio wave reaching the power receiver 20C.

(Example of transmitter operation)
With reference to FIG. 5, an example of the process which the power transmission device 10 which concerns on one Embodiment of this indication performs is demonstrated.

Step S101: The control unit 15 receives the second radio wave including the power transmission request from the power receiver 20 by the communication unit 12.

Step S102: Based on the identifier of the power receiver 20 included in the received power transmission request, the control unit 15 determines whether the power receiver 20 has the right to receive wireless power transmission.

Step S103: If it is determined that the power receiver 20 has the right to receive wireless power transmission (Yes at Step S102), the control unit 15 emits a first radio wave including a power transmission response to the power receiver 20.

Step S104: The control unit 15 performs beam control to increase the intensity of the first radio wave for wireless power transmission that reaches the power receiver 20.

Step S105: The control unit 15 determines whether or not the communication unit 12 receives the second radio wave including the follow-up signal at the first time interval from the power receiver 20. If it is determined that the second radio wave including the follow-up signal is received at the first time interval (step S105-Yes), the control unit 15 continues the process of step S104.

Step S106: If it is determined that the second radio wave including the follow-up signal is not received at the first time interval (No at Step S105), the control unit 15 controls the first radio wave for wireless power transmission reaching the power receiver 20. End the beam control to strengthen the intensity.

Step S107: If it is determined that the power receiver 20 does not have the right to receive wireless power transmission (No at Step S102), the control unit 15 determines whether wireless power transmission is performed to another power receiver.

Step S108: When it is determined that wireless power transmission is performed to another power receiver (Yes in step S107), the control unit 15 is a null that weakens the intensity of the first radio wave for wireless power transmission that reaches the power receiver 20. Take control.

Step S109: The control unit 15 determines whether or not the communication unit 12 receives the second radio wave including the follow-up signal at the second time interval from the power receiver 20. If it is determined that the second radio wave including the follow-up signal is received at the second time interval (step S109—Yes), the control unit 15 continues the process of step S108.

Step S110: When it is determined that the second radio wave including the follow-up signal is not received at the second time interval (Step S109-No), the control unit 15 controls the first radio wave for wireless power transmission reaching the power receiver 20. End null control to weaken the intensity.

Step S111: The control unit 15 determines whether or not the power receiver 20 having the right to receive wireless power transmission exists within the range in which wireless power transmission is possible. If it is determined that the power receiver 20 having the right to receive wireless power transmission exists within the range in which wireless power transmission is possible (Yes at Step S111), the control unit 15 ends the present process.

Step S112: If it is determined that the wireless power transmission is not performed to another power receiver (Step S107-No), or the power receiver 20 having the right to receive wireless power is present within the range where wireless power transmission is possible. If it is determined that the process is not performed (No at Step S111), the control unit 15 does not perform the radiation of the first radio wave by the power transmission unit 11, and ends the process.

(Operation example of the receiver)
An example of a process performed by the power receiver 20 according to an embodiment of the present disclosure will be described with reference to FIG.

Step S201: The control unit 27 causes the communication unit 22 to emit a second radio wave including a power transmission request to the power transmitter 10.

Step S202: The control unit 27 determines whether or not the power reception unit 21 receives the first radio wave including the power transmission response from the power transmitter 10.

Step S203: When it is determined that the first radio wave including the power transmission response from the power transmitter 10 is received by the power reception unit 21 (Yes in step S202), the control unit 27 transmits the first radio wave for wireless power transmission from the power transmitter 10. Received by the power receiving unit 21.

Step S204: The control unit 27 causes the communication unit 22 to emit a second radio wave including a tracking signal at a first time interval to the transmitter 10.

Step S205: When it is determined that the first radio wave including the power transmission response from the power transmitter 10 is not received by the power receiving unit 21 (No in step S202), the control unit 27 transmits the second electric signal to the power transmitter 10 by the communication unit 22. The second radio wave including the follow-up signal is emitted at time intervals.

As described above, according to the present embodiment, the power transmitter 10 includes the power transmission unit 11 that radiates the first radio wave used for wireless power transmission, the communication unit 12 that receives the second radio wave, and the control unit 15. Equipped with When the control unit 15 receives the second radio wave including the power transmission request from the power receiver 20 by the communication unit 12, the control unit 15 determines whether the power receiver 20 has the right to receive wireless power transmission based on the identifier of the power receiver 20 included in the power transmission request. Determine if When the control unit 15 determines that the power receiver 20 has the right, the control unit 15 performs beam control to increase the intensity of the first radio wave reaching the power receiver 20. When it is determined that the power receiver 20 does not have the right, the control unit 15 performs null control to weaken the intensity of the first radio wave reaching the power receiver 20. As described above, the power transmission device 10 performs beam control and null control of the first radio wave, thereby suppressing the occurrence of leaked radio waves due to power transmission to the power reception device 20 having no right to receive wireless power transmission. Power transmission efficiency of wireless power transmission to a target power receiver can be improved. Therefore, the usefulness of the technology for supplying power to the electronic device using radio waves is improved.

According to the present embodiment, when the control unit 15 determines that the power receiving device 20 having the right does not exist within the range in which wireless power transmission is possible, the power transmission unit 11 does not emit the first radio wave. Thereby, the radiation of the first radio wave by the power transmitter 10 can be suppressed, and the usefulness of the technology for supplying power to the electronic device using the radio wave is improved.

According to the present embodiment, when the control unit 15 does not receive the second radio wave by the communication unit 12 with the intensity equal to or more than the predetermined value, the control unit 15 does not perform the radiation of the first radio wave by the power transmission unit 11. Thereby, the radiation of the first radio wave by the power transmitter 10 can be suppressed, and the usefulness of the technology for supplying power to the electronic device using the radio wave is improved.

According to the present embodiment, when the control unit 15 determines that the power receiver 20 does not have the right, if wireless power transmission is performed to the other power receiver 20, the control unit 15 performs null control, and the other power receiver If wireless power transmission is not performed for 20, the power transmission unit 11 does not emit the first radio wave. Thereby, the radiation of the first radio wave by the power transmitter 10 can be suppressed, and the usefulness of the technology for supplying power to the electronic device using the radio wave is improved.

According to the present embodiment, the power receiver 20 emits the second radio wave, the storage unit 23 that stores an identifier that uniquely identifies the power receiver 20, the power reception unit 21 that receives the first radio wave used for wireless power transmission, and the second radio wave. A communication unit 22 and a control unit 27 are provided. The control unit 27 creates a power transmission request and a tracking signal including an identifier, and radiates a second radio wave including the power transmission request to the power transmitter 10 by the communication unit 22. When the power reception unit 21 receives the first radio wave including the power transmission response from the power transmitter 10, the control unit 27 causes the communication unit 22 to emit the second radio wave including the tracking signal to the power transmission device 10. Thus, the receiver 20 emits the second radio wave including the transmission request and the follow-up signal to the transmitter 10, thereby improving the accuracy of the beam control and null control of the first radio wave by the transmitter 10. Power transmission efficiency of wireless power transmission to the power receiver 20 can be improved. Therefore, the usefulness of the technology for supplying power to the electronic device using radio waves is improved.

According to the present embodiment, when the control unit 27 receives the first radio wave including the power transmission response from the power transmitter 10 by the power receiving unit 21, the control unit 27 causes the communication unit 22 to follow the signal for tracking at the first time interval. It emits the second radio wave including. If the control unit 27 does not receive the first radio wave including the power transmission response from the power transmitter 10 by the power receiving unit 21, the control unit 27 causes the communication unit 22 to follow the signal for tracking at the second time interval different from the first time interval. Radiation of the second radio wave including As described above, the power receiver 20 radiates the second radio wave including the follow-up signal at different time intervals to the power transmitter 10, thereby improving the accuracy of the beam control and null control of the first radio wave by the power transmitter 10. The power transmission efficiency of wireless power transmission to the power receiver 20 can be improved. Therefore, the usefulness of the technology for supplying power to the electronic device using radio waves is improved.

According to the present embodiment, the wireless power transmission system 1 radiates the first radio wave used for wireless power transmission, receives the second radio wave, and receives the first radio wave, and receives the second radio wave. And an electric machine 20. When the second radio wave including the power transmission request is received from the power receiver 20, the power transmitter 10 determines whether the power receiver 20 has the right to receive wireless power transmission based on the identifier of the power receiver 20 included in the power transmission request. . When it is determined that the power receiver 20 has the right, the power transmitter 10 performs beam control to increase the intensity of the first radio wave that reaches the power receiver. When it is determined that the power receiver 20 does not have the right, the power transmitter 10 performs null control to weaken the intensity of the first radio wave that reaches the power receiver 20. As described above, the power transmission device 10 performs beam control and null control of the first radio wave, thereby suppressing the occurrence of leaked radio waves due to power transmission to the power reception device 20 having no right to receive wireless power transmission. Power transmission efficiency of wireless power transmission to the target power receiving device 20 can be improved. Therefore, the usefulness of the technology for supplying power to the electronic device using radio waves is improved.

According to the present embodiment, when it is determined that the power receiver 20 has the right, the power transmitter 10 emits the first radio wave including the power transmission response to the power receiver 20. Accordingly, it can be determined that the power receiver 20 can receive wireless power transmission from the power transmitter 10. Therefore, the usefulness of the technology for supplying power to the electronic device using radio waves is improved.

Although the embodiments described above have been described as representative examples, it is obvious to those skilled in the art that many modifications and substitutions may be made within the spirit and scope of the present disclosure. Accordingly, the present disclosure should not be construed as being limited by the above-described embodiments, and various modifications or changes are possible without departing from the scope of the claims. For example, each means or function included in each step can be rearranged so as not to be logically contradictory, and it is possible to combine or divide a plurality of means or steps into one. is there.

In the present disclosure, at least a part of the processing described in association with each function of the power transmitter 10 and the power receiver 20 may be realized by another function. For example, the processing described as the roles of the power transmission unit 11 and the communication unit 12 of the power transmission device 10 may be realized only by the power transmission unit 11. Also, the roles of the power receiving unit 21 and the communication unit 22 disposed in the power receiving device 20 may be realized by the power receiving unit 21 alone.

For example, in the embodiment described above, the power receiver 20 may execute part or all of the operations and processes performed by the transmitter 10. Similarly, the transmitter 10 may execute part or all of the operation performed by the power receiver 20. For example, the content of the present disclosure can also be realized by remotely controlling the power reception unit 21 and the communication unit 22 of the power receiver 20 from the control unit 15 of the power transmission device 10.

DESCRIPTION OF SYMBOLS 1 wireless power transmission system 10 power transmission unit 11 power transmission unit 11A antenna 11B oscillator 12 communication unit 13 storage unit 14 storage battery 15 control unit 20

power receiver

20A, 20B, 20C power receiver 21 power reception unit 21A antenna 21B rectification circuit 22 communication unit 23 memory unit 24 Storage battery 25 Notification unit 26 Input unit 27 Control unit

Claims

A power transmission unit that radiates a first radio wave used for wireless power transmission;
A communication unit that receives the second radio wave,
A controller comprising:
The control unit
When the second radio wave including the power transmission request is received from the power receiver by the communication unit, it is determined whether the power receiver has the right to receive the wireless power transmission based on the identifier of the power receiver included in the power transmission request. And
When it is determined that the power receiver has the right, beam control is performed to increase the intensity of the first radio wave that reaches the power receiver,
When it is determined that the power receiver does not have the right, null control is performed to weaken the intensity of the first radio wave reaching the power receiver.
Power transmitter.
The transmission according to claim 1, wherein the control unit does not emit the first radio wave by the power transmission unit when the control unit determines that the power receiver having the right does not exist within the range in which the wireless power transmission is possible. Electric.
The power transmission device according to claim 1, wherein the control unit does not radiate the first radio wave by the power transmission unit when the second radio wave is not received by the communication unit at a strength equal to or higher than a predetermined value.
When the control unit determines that the power receiver does not have the right,
If the wireless power transmission is performed to another power receiver, the null control is performed,
The power transmitter according to any one of claims 1 to 3, wherein radiation of the first radio wave by the power transmission unit is not performed if the wireless power transmission is not performed to another power receiver.
A power transmission unit that radiates a first radio wave used for wireless power transmission;
A communication unit that receives the second radio wave,
A control method of a power transmission machine comprising
When the second radio wave including the power transmission request is received from the power receiver by the communication unit, it is determined whether the power receiver has the right to receive the wireless power transmission based on the identifier of the power receiver included in the power transmission request. Step to
Performing beam control to increase the intensity of the first radio wave reaching the power receiver if it is determined that the power receiver has the right;
Performing null control to weaken the intensity of the first radio wave reaching the power receiver if it is determined that the power receiver does not have the right;
Control methods, including:
A storage unit that stores an identifier that uniquely identifies the power receiver;
A power reception unit that receives a first radio wave used for wireless power transmission;
A communication unit that emits a second radio wave,
A power receiver comprising a controller;
The control unit
Creating a power transmission request and a tracking signal including the identifier;
Radiating the second radio wave including the power transmission request to the power transmitter by the communication unit;
When the power reception unit receives the first radio wave including a power transmission response from the power transmission unit, the communication unit emits the second radio wave including the tracking signal to the power transmission unit.
Receiver.
The control unit
When the power receiving unit receives the first radio wave including a power transmission response from the power transmitter, the communication unit emits the second radio wave including the tracking signal at a first time interval to the power transmitter.
When the first radio wave including the power transmission response from the power transmitter is not received by the power reception unit, the communication unit causes the communication unit to include the tracking signal at a second time interval different from the first time interval. Emit the second radio wave,
The power receiver according to claim 6.
A transmitter that radiates a first radio wave used for wireless power transmission and receives a second radio wave;
A receiver that receives the first radio wave and emits the second radio wave;
A wireless power transmission system comprising
The transmitter is
When the second radio wave including the power transmission request is received from the power receiver, it is determined whether the power receiver has the right to receive the wireless power transmission based on the identifier of the power receiver included in the power transmission request,
When it is determined that the power receiver has the right, beam control is performed to increase the intensity of the first radio wave that reaches the power receiver,
When it is determined that the power receiver does not have the right, null control is performed to weaken the intensity of the first radio wave reaching the power receiver.
Wireless power transmission system.
The wireless power transmission system according to claim 8, wherein the power transmitter does not emit the first radio wave when it is determined that the power receiver having the right does not exist within the range in which the wireless power transmission is possible.
10. The wireless power transmission system according to claim 8, wherein, when it is determined that the power receiver has the right, the power transmitter emits the first radio wave including a power transmission response to the power receiver.
When the power receiver receives the first radio wave including the power transmission response from the power transmitter after radiation of the second radio wave including the power transmission request, the power receiver radiates the second radio wave including the tracking signal to the power transmitter. The wireless power transmission system according to claim 10.
The power receiver is
When the first radio wave including the power transmission response from the power transmitter is received, the second radio wave including the tracking signal is emitted to the power transmitter at a first time interval;
If the first radio wave including the power transmission response from the power transmitter is not received, the second radio wave including the tracking signal is emitted to the power transmitter at a second time interval different from the first time interval.
The wireless power transmission system according to claim 11.