WO2019163572A1 - Wireless power transmission system, power receiver, power transmitter, and wireless power transmission method - Google Patents

Wireless power transmission system, power receiver, power transmitter, and wireless power transmission method Download PDF

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Publication number
WO2019163572A1
WO2019163572A1 PCT/JP2019/004712 JP2019004712W WO2019163572A1 WO 2019163572 A1 WO2019163572 A1 WO 2019163572A1 JP 2019004712 W JP2019004712 W JP 2019004712W WO 2019163572 A1 WO2019163572 A1 WO 2019163572A1
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WO
WIPO (PCT)
Prior art keywords
power
power transmission
receiver
obstacle
transmitter
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PCT/JP2019/004712
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French (fr)
Japanese (ja)
Inventor
晋 小澤
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京セラ株式会社
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Publication of WO2019163572A1 publication Critical patent/WO2019163572A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Definitions

  • the present disclosure relates to a wireless power transmission system, a receiver, a power transmitter, and a wireless power transmission method.
  • Patent Document 1 discloses a power transmission device that supplies power to a device using a microwave.
  • a wireless power transmission system includes a power transmitter that transmits power using radio waves, and a power receiver that receives the radio waves from the power transmitter.
  • the power receiving device includes a detection unit that detects whether an obstacle is approaching within a predetermined range from the own device. When the detection unit detects that the obstacle is approaching within the predetermined range from the power receiver, the power transmitter reduces power transmitted to the power receiver and transmits power to the power receiver. Perform one of the stops.
  • a power receiving device includes: a receiving unit that receives radio waves from a power transmitter; a transmitting unit that transmits a signal to the power transmitter; and whether an obstacle is within a predetermined range from the own device.
  • a detection unit for detecting. When the detection unit detects that the obstacle is approaching within the predetermined range from the power receiving device, the transmission unit transmits power to the power transmission device by transmitting a predetermined signal to the power transmission device.
  • the power transmitter is caused to execute either of the reduction of power transmission or the stop of power transmission to the own device.
  • a power transmission device includes a transmission unit that transmits a radio wave for transmitting power to a power receiver and a reception unit that receives a signal from the power receiver.
  • the power transmitter is configured to reduce power transmitted to the power receiver and stop power transmission to the power receiver when the power receiver detects that an obstacle is within a predetermined range from the power receiver. Do one of the following:
  • a power receiving device that receives radio waves from a power transmitter detects whether an obstacle is approaching within a predetermined range from the own device.
  • the power receiver detects a reduction in power transmitted to the power receiver, and One of the stoppages of the power transmission to the said receiving machine is performed.
  • 1 is a diagram illustrating a schematic configuration example of a wireless power transmission system according to an embodiment.
  • 1 is a block diagram illustrating a schematic configuration example of a wireless power transmission system according to an embodiment. It is a flowchart which shows an example of the procedure of the wireless power transmission method which concerns on one Embodiment. It is a flowchart which shows an example of the procedure of the wireless power transmission method which concerns on one Embodiment. It is a flowchart which shows an example of the procedure of the wireless power transmission method which concerns on one Embodiment. It is a flowchart which shows an example of the procedure of the wireless power transmission method which concerns on one Embodiment.
  • the utility of power transmission / reception can be enhanced.
  • the wireless power transmission system 1 includes a power receiver 10 and a power transmitter 20.
  • the power receiving machine 10 includes a remote controller 10a and a timepiece 10b, but is not limited thereto, and may include other various devices such as a terminal.
  • the power transmitter 20 transmits radio waves to the power receiver 10.
  • the power receiver 10 receives radio waves from the power transmitter 20 and receives at least a part of the radio waves. That is, the power receiver 10 receives power from the power transmitter 20.
  • the power receiver 10 may transmit a radio wave including a signal requesting power transmission to the power transmitter 20.
  • a signal for requesting power transmission to the power transmitter 20 is also referred to as a power transmission request signal.
  • An example of a radio wave path between the power receiver 10 and the power transmitter 20 is indicated by a broken line in FIG.
  • the power receiving machine 10 includes a transmission unit 11, a reception unit 12, a power supply unit 13, a control unit 14, and a detection unit 15.
  • the transmission unit 11 transmits a power transmission request signal to the power transmitter 20.
  • the receiving unit 12 receives radio waves transmitted from the power transmitter 20.
  • the power supply unit 13 converts at least a part of the radio wave received by the receiving unit 12 into electric power, and supplies the electric power to each component of the electric receiver 10.
  • the control unit 14 controls each component of the power receiving machine 10.
  • the detection unit 15 detects an obstacle 30 located around the power receiving machine 10.
  • the detection unit 15 may include a sensor.
  • the sensor may include a proximity sensor.
  • the sensor may detect various information.
  • the sensor may detect the position of the obstacle 30 around the received electrical machine 10 or the distance to the obstacle 30 based on the detected information.
  • the sensor may emit infrared rays or ultrasonic waves to the surroundings to detect reflection from the obstacle 30.
  • the sensor may detect a capacitance generated between the detection unit 15 and the obstacle 30.
  • the sensor may detect a change in illuminance of ambient light that is blocked by the obstacle 30.
  • the sensor may detect a sound emitted from the obstacle 30.
  • the receiving unit 12 may function as the detecting unit 15.
  • the receiving unit 12 can receive a reflected wave of a radio wave including a signal such as a power transmission request signal transmitted by the transmitting unit 11.
  • the receiving unit 12 is based on the difference between the timing at which the transmitting unit 11 transmits the radio wave and the timing at which the reflected wave is received, or the position of the obstacle 30 around the receiver 10 or the distance to the obstacle 30. May be detected.
  • the difference between the timing at which the transmission unit 11 transmits radio waves and the timing at which the reflected waves are received is also referred to as reflected wave detection time.
  • the receiving unit 12 can detect the distance between the power receiver 10 and the obstacle 30 based on the reflected wave detection time.
  • the receiving unit 12 may include an antenna having directivity.
  • the receiving unit 12 may specify the direction in which the reflected wave is received based on the directivity of the antenna.
  • the receiving unit 12 can detect the position of the obstacle 30 based on the direction in which the reflected wave is received.
  • the detection unit 15 may acquire information from an external camera or sensor.
  • the external camera may take an image of the periphery of the power receiver 10.
  • the external sensor may detect the obstacle 30 located around the power receiver 10.
  • the detection unit 15 may detect the position of the obstacle 30 around the received electrical machine 10 or the distance to the obstacle 30 based on the acquired information.
  • the power transmitter 20 includes a transmission unit 21, a reception unit 22, and a control unit 23.
  • the transmission unit 21 transmits radio waves to the power receiver 10.
  • the receiving unit 22 receives radio waves transmitted from the power receiver 10.
  • Each of the transmission unit 21 and the reception unit 22 may include an antenna.
  • the transmission unit 21 and the reception unit 22 may include an antenna that is commonly used for transmission and reception.
  • the receiving unit 22 receives a power transmission request signal from the power receiver 10.
  • the control unit 23 causes the transmission unit 21 to transmit radio waves based on the power transmission request signal.
  • the receiving unit 22 may receive various signals from the power receiver 10.
  • the control unit 23 may cause the transmission unit 21 to transmit a radio wave including a signal based on the signal received from the power receiving machine 10.
  • the power receiver 10 can be installed at a predetermined position.
  • the transmission unit 21 of the power transmission device 20 may include an omnidirectional antenna.
  • the transmission unit 21 may transmit a radio wave using an omnidirectional antenna. By doing so, the power transmitter 20 can transmit radio waves to the power receiver 10 regardless of the position where the power receiver 10 is installed.
  • the control unit 23 of the power transmission device 20 may acquire information regarding the position where the power receiver 10 is installed from the power receiver 10.
  • the transmission unit 21 may include an antenna having directivity and transmit a radio wave having directivity.
  • the control unit 23 may cause the transmission unit 21 to transmit a directional radio wave toward the power receiving device 10 based on the information regarding the position where the power receiving device 10 is installed. That is, the control unit 23 may perform beam forming on the radio wave to be transmitted.
  • a radio wave having directivity toward the power receiver 10 can reach the power receiver 10 with higher intensity than a non-directional radio wave. By doing in this way, the power transmission device 20 can control the intensity of the radio wave reaching the power receiver 10.
  • the power receiving machine 10 may transmit a radio wave including a power transmission request signal.
  • the power transmission request signal may include information related to the position where the power receiver 10 is installed.
  • the receiver 22 of the power transmitter 20 may receive a radio wave including a power transmission request signal.
  • the control unit 23 may acquire the position of the power receiving machine 10 based on the power transmission request signal included in the radio wave received by the receiving unit 22.
  • the receiving unit 22 may include an antenna having directivity.
  • the receiving unit 22 may detect from which direction the radio wave including the power transmission request signal has reached the power transmitter 20 by using an antenna having directivity.
  • the control unit 23 may acquire information regarding the direction in which the radio wave including the power transmission request signal has been detected, which is detected by the reception unit 22.
  • the control unit 23 may acquire information regarding the direction in which the radio wave including the power transmission request signal has arrived as information regarding the position where the power receiving device 10 is installed.
  • the control unit 23 may beam-form the radio wave in the direction in which the radio wave including the power transmission request signal has arrived. When the radio wave including the power transmission request signal arrives from two or more directions, the control unit 23 may beam-form the radio wave in each direction.
  • the control unit 23 may control the direction in which the radio wave to be transmitted to the transmission unit 21 is beam-formed in a time division manner. For example, the control unit 23 may beam-form the radio waves transmitted to the remote controller 10a and the timepiece 10b shown in FIG. 1 in a time division manner.
  • the obstacle 30 When the obstacle 30 is located on the radio wave path from the power transmitter 20 to the power receiver 10, the radio wave transmitted from the power transmitter 20 is difficult to reach the power receiver 10. When the obstacle 30 is located in the vicinity of the power receiver 10, the radio wave transmitted from the power transmitter 20 is more difficult to reach the power receiver 10. That is, the obstacle 30 can prevent power reception in the power receiving machine 10.
  • the position of the obstacle 30 is expressed with reference to the position of the receiver 10. It is assumed that the power received by the power receiver 10 is the first power when the obstacle 30 is located around the power receiver 10. It is assumed that the power received by the power receiver 10 when the obstacle 30 is not present around the power receiver 10 is the second power.
  • the first power can be reduced to less than a predetermined ratio with respect to the second power.
  • a set of positions of the obstacles 30 when the obstacle 30 reduces the first power to less than a predetermined ratio with respect to the second power is also referred to as a predetermined range.
  • the power received by the power receiver 10 when the obstacle 30 is close to a predetermined range with respect to the position of the power receiver 10 is the power received by the power receiver 10 when the obstacle 30 is not present around the power receiver 10. Decreases to less than a predetermined ratio with respect to the power received.
  • the predetermined range may be a range within a predetermined distance from the power receiver 10.
  • the power transmitter 20 transmits power to the power receiver 10 when the obstacle 30 is not approaching the predetermined range from the power receiver 10.
  • the radio wave transmitted from the power transmitter 20 is likely to reach the power receiver 10 as compared to the case where the obstacle 30 is approaching within a predetermined range from the power receiver 10.
  • the power transmitter 20 may transmit power to the power receiver 10 when the distance between the obstacle 30 and the power receiver 10 is equal to or greater than a predetermined distance.
  • the radio wave transmitted from the power transmitter 20 easily reaches the power receiver 10.
  • the power transmitter 20 may transmit power to the power receiver 10 when the obstacle 30 is not approaching within a predetermined distance from the power receiver 10.
  • the power transmission device 20 can more easily determine whether to transmit power based on the distance between the obstacle 30 and the power receiving device 10.
  • the obstacle 30 can be various objects.
  • the obstacle 30 can be various devices.
  • the obstacle 30 can be various devices that transmit and receive radio waves.
  • the obstacle 30 may be a moving body such as a robot, a radio control, or a drone.
  • the obstacle 30 may be a living body such as a human being or an animal.
  • the operation of the obstacle 30 can be hindered by the radio wave transmitted from the power transmitter 20.
  • the radio waves of the power transmitter 20 can prevent the devices from transmitting and receiving radio waves. That is, the wireless power transmission system 1 can cause a communication failure.
  • the power transmitter 20 when the obstacle 30 is approaching within a predetermined range from the power receiver 10, the power transmitter 20 does not transmit radio waves or reduces the intensity of radio waves to be transmitted.
  • the condition that the power transmitter 20 does not transmit radio waves or reduces the intensity of the radio waves to be transmitted includes a case where the obstacle 30 is approaching within a predetermined range from the receiver 10.
  • the condition that the power transmitter 20 does not transmit radio waves or reduces the intensity of radio waves to be transmitted may include a case where the distance between the obstacle 30 and the receiver 10 is equal to or less than a predetermined distance.
  • the power transmission device 20 does not transmit radio waves based on the position of the obstacle 30 or reduces the strength of the radio waves to be transmitted, so that the power transmission / reception operation does not easily disturb the operation of the obstacle 30 or hardly causes communication failure. It becomes. As a result, the utility of power transmission / reception can be enhanced.
  • the wireless power transmission system 1 may cause the power transmitter 20 to stop power transmission when the obstacle 30 is approaching within a predetermined range from the power receiver 10 by executing the procedure shown in FIG.
  • the electric receiving machine 10 detects the obstacle 30 by the detection unit 15 (step S11).
  • the detection unit 15 detects whether the obstacle 30 is located around the power receiving machine 10.
  • the detection unit 15 may detect the position of the obstacle 30.
  • the detection unit 15 may detect the distance between the obstacle 30 and the power receiver 10.
  • the detection unit 15 When the detection unit 15 is a sensor, the detection unit 15 may detect the obstacle 30 by the sensor. When the reception unit 12 functions as the detection unit 15, the reception unit 12 may detect the obstacle 30 based on the reflected wave detection time. When the detection unit 15 acquires information from an external camera or sensor, the detection unit 15 may detect the position of the obstacle 30 based on the acquired information.
  • the receiving device 10 determines whether the obstacle 30 is approaching within a predetermined range from the receiving device 10 (step S12). Based on the position of the obstacle 30 detected by the detection unit 15, the power receiving machine 10 determines whether the obstacle 30 is approaching within a predetermined range from the power receiving machine 10. The power receiving device 10 may determine whether the distance between the obstacle 30 detected by the detection unit 15 and the power receiving device 10 is less than a predetermined distance.
  • step S12 When the obstacle 30 has not approached the predetermined range from the receiver 10 (step S12: NO), the receiver 10 proceeds to the procedure of step S14. That is, the power receiving machine 10 does not transmit a power transmission stop signal when the obstacle 30 is not approaching the predetermined range.
  • step S12: YES When the obstacle 30 is approaching within a predetermined range from the power receiver 10 (step S12: YES), the power receiver 10 transmits a power transmission stop signal to the power transmitter 20 (step S13).
  • the power receiving machine 10 ends the procedure of the flowchart of FIG. 3 after the procedure of step S13.
  • the power transmitter 20 determines whether a power transmission stop signal has been received (step S21).
  • the power transmission device 20 receives the power transmission stop signal (step S21: YES)
  • the power transmission device 20 ends the procedure of the flowchart of FIG. That is, when the power transmission device 20 receives a power transmission stop signal, the power transmission device 20 stops power transmission to the power receiving machine 10 by transmission of radio waves.
  • the power transmission device 20 proceeds to the procedure of step S22.
  • the power receiving machine 10 transmits a power transmission request signal to the power transmitter 20 (step S14).
  • the power transmitter 20 determines whether a power transmission request signal has been received (step S22).
  • the procedure of the flowchart of FIG. 3 ends. That is, the power transmitter 20 does not transmit power to the receiver 10 when it does not receive the power transmission request signal.
  • step S22 When the power transmitter 20 receives the power transmission request signal (step S22: YES), the power transmitter 20 transmits power to the receiver 10 (step S23). The power transmitter 20 ends the procedure of the flowchart of FIG. 3 after step S23. On the other hand, the power receiver 10 receives power from the power transmitter 20 (step S15). The power receiving machine 10 ends the procedure of the flowchart of FIG. 3 after step S15.
  • the wireless power transmission system 1 may reduce the power transmitted from the power transmitter 20 when the obstacle 30 is approaching within a predetermined range from the power receiver 10 by executing the procedure shown in FIG.
  • the electric receiving machine 10 detects the obstacle 30 by the detection unit 15 (step S31).
  • the power receiving machine 10 may execute the same or similar procedure as the procedure of step S11 of FIG.
  • the receiving device 10 determines whether the obstacle 30 is approaching within a predetermined range from the receiving device 10 (step S32).
  • the power receiving machine 10 may execute the same or similar procedure as the procedure of step S12 of FIG.
  • step S34 the receiver 10 proceeds to the procedure of step S34. That is, the power receiving machine 10 does not transmit a power transmission reduction signal when the obstacle 30 is not approaching the predetermined range.
  • step S33 the power receiver 10 transmits a power transmission reduction signal to the power transmitter 20 (step S33).
  • the power transmission reduction signal includes control information that instructs the power transmitter 20 to reduce the power to be transmitted.
  • the electric receiver 10 proceeds to the procedure of step S34 after the procedure of step S33.
  • the power transmitter 20 determines whether a power transmission reduction signal has been received (step S41). When the power transmission device 20 has not received the power transmission reduction signal (step S41: NO), the power transmission device 20 proceeds to the procedure of step S43. When the power transmission device 20 receives the power transmission reduction signal (step S41: YES), the power transmission device 20 is set to reduce the intensity of the radio wave transmitted to transmit power to the receiver 10 (step S42). That is, the power transmitter 20 reduces the power transmitted to the receiver 10 when receiving the power transmission reduction signal. The power transmitter 20 proceeds to step S43 after step S42.
  • the power receiving machine 10 transmits a power transmission request signal to the power transmitter 20 (step S34).
  • the power transmitter 20 determines whether a power transmission request signal has been received (step S43).
  • step S43: NO the procedure of the flowchart of FIG. 4 ends. That is, the power transmitter 20 does not transmit power to the receiver 10 when it does not receive the power transmission request signal.
  • the power transmitter 20 When the power transmitter 20 receives the power transmission request signal (step S43: YES), the power transmitter 20 transmits power to the receiver 10 (step S44).
  • the power transmitter 20 transmits power to the power receiver 10 by transmitting a radio wave having an intensity based on the setting. That is, when the power transmitter 20 is set to reduce the intensity of radio waves, the power transmitter 20 transmits the reduced power.
  • the power transmitter 20 ends the procedure of the flowchart of FIG. 4 after step S44.
  • the power receiver 10 receives power from the power transmitter 20 (step S35).
  • the power receiving machine 10 ends the procedure of the flowchart of FIG. 4 after step S35.
  • the wireless power transmission system 1 may restart the power transmission by executing the procedure illustrated in FIG. 5.
  • the electric receiving machine 10 detects the obstacle 30 by the detection unit 15 (step S51).
  • the power receiving machine 10 may execute the same or similar procedure as the procedure of step S11 of FIG.
  • the receiving device 10 determines whether the obstacle 30 has moved out of the predetermined range from the receiving device 10 (step S52). Based on the position of the obstacle 30 detected by the detection unit 15, the receiving device 10 determines whether the obstacle 30 has moved out of the predetermined range from the receiving device 10.
  • the power receiver 10 may determine whether the obstacle 30 has transitioned from a state in which the obstacle 30 is approaching within a predetermined range from the power receiver 10 to a state in which the obstacle 30 has moved out of the predetermined range from the power receiver 10.
  • the power receiver 10 may determine whether the distance between the obstacle 30 and the power receiver 10 is equal to or greater than a predetermined distance.
  • step S52: NO the receiver 10 ends the procedure of the flowchart of FIG. That is, the power receiving device 10 does not transmit a power transmission restart signal to the power transmitter 20 while the obstacle 30 remains within the predetermined range.
  • step S52: YES the power receiver 10 transmits a power transmission restart signal to the power transmitter 20 (step S53).
  • the power transmitter 20 determines whether a power transmission resumption signal has been received (step S61).
  • step S61: NO the procedure of the flowchart of FIG.
  • step S61: YES the power transmitter 20 proceeds to the procedure of step S62.
  • the power receiving machine 10 transmits a power transmission request signal to the power transmitter 20 (step S54).
  • the power transmitter 20 determines whether a power transmission request signal has been received (step S62).
  • step S62 NO
  • step S62 When the power transmitter 20 receives the power transmission request signal (step S62: YES), the power transmitter 20 transmits power to the receiver 10 (step S63). The power transmitter 20 ends the procedure of the flowchart of FIG. 5 after step S63. On the other hand, the power receiver 10 receives power from the power transmitter 20 (step S55). The power receiving machine 10 ends the procedure of the flowchart of FIG. 5 after step S55.
  • the wireless power transmission system 1 may increase the power transmitted from the power transmitter 20 by executing the procedure illustrated in FIG. 6.
  • the electric receiving machine 10 detects the obstacle 30 by the detection unit 15 (step S71).
  • the power receiving machine 10 may execute the same or similar procedure as the procedure of step S11 of FIG.
  • the receiving device 10 determines whether the obstacle 30 has moved out of the predetermined range from the receiving device 10 (step S72).
  • the power receiving machine 10 may execute the same or similar procedure as the procedure of step S52 of FIG.
  • step S72 When the obstacle 30 has not moved out of the predetermined range from the receiver 10 (step S72: NO), the receiver 10 proceeds to the procedure of step S74. That is, the power receiving machine 10 does not transmit a power transmission increase signal to the power transmitter 20 while the obstacle 30 remains within the predetermined range.
  • step S72: YES When the obstacle 30 moves out of the predetermined range from the power receiver 10 (step S72: YES), the power receiver 10 transmits a power transmission increase signal to the power transmitter 20 (step S73).
  • the power transmitter 20 determines whether a power transmission increase signal has been received (step S81). When the power transmitter 20 has not received the power transmission increase signal (step S81: NO), the power transmitter 20 proceeds to the procedure of step S83. When the power transmission device 20 receives a power transmission increase signal (step S81: YES), the power transmission device 20 sets itself so as to increase the strength of the radio wave. The power transmitter 20 proceeds to the procedure of Step S83 after Step S82.
  • the power receiving machine 10 transmits a power transmission request signal to the power transmitter 20 (step S74).
  • the power transmitter 20 determines whether a power transmission request signal has been received (step S83).
  • step S83: NO the procedure of the flowchart of FIG. 6 ends. That is, the power transmitter 20 does not transmit power to the receiver 10 when it does not receive the power transmission request signal.
  • step S83 When the power transmitter 20 receives the power transmission request signal (step S83: YES), the power transmitter 20 transmits power to the receiver 10 (step S84). The power transmitter 20 ends the procedure of the flowchart of FIG. 6 after step S84. On the other hand, the power receiver 10 receives power from the power transmitter 20 (step S75). The power receiving machine 10 ends the procedure of the flowchart of FIG. 6 after step S75.
  • the power transmission stop signal, power transmission restart signal, power transmission reduction signal, and power transmission increase signal used in the procedures shown in FIGS. 3 to 6 are set so that the magnitude of the transmission power from the power transmitter 20 is a predetermined value. It can be regarded as an indicating signal.
  • the predetermined value in the power transmission stop signal can be zero.
  • the predetermined value in the power transmission reduction signal can be a small value with respect to the transmission power before signal transmission.
  • the predetermined value in the power transmission increase signal can be a large value with respect to the transmission power before signal transmission.
  • the predetermined value in the power transmission restart signal may be a value corresponding to the transmitted power immediately before the transmission stop signal is transmitted, or may be any other value.
  • the procedures in the flowcharts shown in FIGS. 3 to 6 may be combined as appropriate.
  • the power transmission stop signal is transmitted, not only the power transmission restart signal but also other signals such as a power transmission increase signal may be transmitted.
  • the power transmission reduction signal is transmitted, not only a power transmission increase signal but also other signals such as a power transmission stop signal or a power transmission restart signal may be transmitted. That is, the electric receiver 10 may transmit various signals in combination based on the detection result of the obstacle 30.
  • the wireless power transmission system 1 causes the power transmitter 20 to stop power transmission or reduce the power transmitted from the power transmitter 20 when an obstacle 30 is approaching within a predetermined range from the power receiver 10. Or By doing in this way, the power receiving efficiency in the receiving device 10 can be improved. As a result, the utility of power transmission / reception can be enhanced.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

This wireless power transmission system is provided with a power transmitter which transmits power by means of radio waves, and a power receiver which receives the radio waves from the power transmitter. The power receiver includes a detecting unit which detects whether an obstacle has approached to within a prescribed range from the power receiver. If the detecting unit detects that an obstacle has approached to within the prescribed range from the power receiver, the power transmitter either reduces the power transmitted to the power receiver, or stops power transmission to the power receiver.

Description

無線送電システム、受電機、送電機、及び無線送電方法Wireless power transmission system, power receiver, power transmitter, and wireless power transmission method 関連出願へのクロスリファレンスCross-reference to related applications
　本出願は、日本国特許出願２０１８－３０６５７号（２０１８年２月２３日出願）の優先権を主張するものであり、当該出願の開示全体を、ここに参照のために取り込む。 This application claims the priority of Japanese Patent Application No. 2018-30657 (filed on Feb. 23, 2018), the entire disclosure of which is incorporated herein by reference.
　本開示は、無線送電システム、受電機、送電機、及び無線送電方法に関する。 The present disclosure relates to a wireless power transmission system, a receiver, a power transmitter, and a wireless power transmission method.
　従来、電磁波を用いて電子機器に電力を供給する方法が知られている。例えば、特許文献１には、マイクロ波を用いてデバイスに電力を供給する送電装置が開示されている。 Conventionally, a method of supplying electric power to an electronic device using electromagnetic waves is known. For example, Patent Document 1 discloses a power transmission device that supplies power to a device using a microwave.
特開２０１４－２２３０１８号公報Japanese Patent Laid-Open No. 2014-2223018
　本開示の一実施形態に係る無線送電システムは、電波によって送電する送電機と、前記送電機からの電波を受電する受電機とを備える。前記受電機は、障害物が自機から所定範囲内に接近しているか検知する検知部を有する。前記障害物が前記受電機から前記所定範囲内に接近していると前記検知部が検知した場合、前記送電機は、前記受電機へ送電する電力の低減、及び、前記受電機への送電の停止のいずれかを実行する。 A wireless power transmission system according to an embodiment of the present disclosure includes a power transmitter that transmits power using radio waves, and a power receiver that receives the radio waves from the power transmitter. The power receiving device includes a detection unit that detects whether an obstacle is approaching within a predetermined range from the own device. When the detection unit detects that the obstacle is approaching within the predetermined range from the power receiver, the power transmitter reduces power transmitted to the power receiver and transmits power to the power receiver. Perform one of the stops.
　本開示の一実施形態に係る受電機は、送電機からの電波を受電する受信部と、前記送電機に信号を送信する送信部と、障害物が自機から所定範囲内に接近しているか検知する検知部とを備える。前記障害物が前記受電機から前記所定範囲内に接近していると前記検知部が検知した場合、前記送信部は、前記送電機に所定の信号を送信することによって、自機へ送電する電力の低減、及び、自機への送電の停止のいずれかを前記送電機に実行させる。 A power receiving device according to an embodiment of the present disclosure includes: a receiving unit that receives radio waves from a power transmitter; a transmitting unit that transmits a signal to the power transmitter; and whether an obstacle is within a predetermined range from the own device. A detection unit for detecting. When the detection unit detects that the obstacle is approaching within the predetermined range from the power receiving device, the transmission unit transmits power to the power transmission device by transmitting a predetermined signal to the power transmission device. The power transmitter is caused to execute either of the reduction of power transmission or the stop of power transmission to the own device.
　本開示の一実施形態に係る送電機は、受電機に送電するための電波を送信する送信部と、前記受電機からの信号を受信する受信部とを備える。前記送電機は、障害物が前記受電機から所定範囲内に接近していると前記受電機において検知された場合、前記受電機へ送電する電力の低減、及び、前記受電機への送電の停止のいずれかを実行する。 A power transmission device according to an embodiment of the present disclosure includes a transmission unit that transmits a radio wave for transmitting power to a power receiver and a reception unit that receives a signal from the power receiver. The power transmitter is configured to reduce power transmitted to the power receiver and stop power transmission to the power receiver when the power receiver detects that an obstacle is within a predetermined range from the power receiver. Do one of the following:
　本開示の一実施形態に係る無線送電方法において、送電機からの電波を受電する受電機が、障害物が自機から所定範囲内に接近しているか検知する。前記無線送電方法において、前記送電機が、前記障害物が前記受電機から前記所定範囲内に接近していると前記受電機において検知された場合、前記受電機へ送電する電力の低減、及び、前記受電機への送電の停止のいずれかを実行する。 In the wireless power transmission method according to an embodiment of the present disclosure, a power receiving device that receives radio waves from a power transmitter detects whether an obstacle is approaching within a predetermined range from the own device. In the wireless power transmission method, when the power transmitter detects that the obstacle is within the predetermined range from the power receiver, the power receiver detects a reduction in power transmitted to the power receiver, and One of the stoppages of the power transmission to the said receiving machine is performed.
一実施形態に係る無線送電システムの概略構成例を示す図である。1 is a diagram illustrating a schematic configuration example of a wireless power transmission system according to an embodiment. 一実施形態に係る無線送電システムの概略構成例を示すブロック図である。1 is a block diagram illustrating a schematic configuration example of a wireless power transmission system according to an embodiment. 一実施形態に係る無線送電方法の手順の一例を示すフローチャートである。It is a flowchart which shows an example of the procedure of the wireless power transmission method which concerns on one Embodiment. 一実施形態に係る無線送電方法の手順の一例を示すフローチャートである。It is a flowchart which shows an example of the procedure of the wireless power transmission method which concerns on one Embodiment. 一実施形態に係る無線送電方法の手順の一例を示すフローチャートである。It is a flowchart which shows an example of the procedure of the wireless power transmission method which concerns on one Embodiment. 一実施形態に係る無線送電方法の手順の一例を示すフローチャートである。It is a flowchart which shows an example of the procedure of the wireless power transmission method which concerns on one Embodiment.
　送電装置から送電される電力を受電装置が効率良く受電することによって、送受電の有用性が高まりうる。 When the power receiving device efficiently receives the power transmitted from the power transmitting device, the utility of power transmission / reception can be enhanced.
　図１及び図２に示されるように、一実施形態に係る無線送電システム１は、受電機１０と、送電機２０とを備える。図１において、受電機１０は、リモコン１０ａと時計１０ｂとを含むが、これらに限られず、端末等の他の種々の機器を含んでよい。 As shown in FIG. 1 and FIG. 2, the wireless power transmission system 1 according to an embodiment includes a power receiver 10 and a power transmitter 20. In FIG. 1, the power receiving machine 10 includes a remote controller 10a and a timepiece 10b, but is not limited thereto, and may include other various devices such as a terminal.
　送電機２０は、受電機１０に対して電波を送信する。受電機１０は、送電機２０からの電波を受信し、その電波の少なくとも一部を受電する。つまり、受電機１０は、送電機２０から受電する。受電機１０は、送電機２０に対して、送電を要求する信号を含む電波を送信してよい。送電機２０に対して送電を要求する信号は、送電要求信号ともいう。受電機１０と送電機２０との間の電波の経路の一例は、図１において破線で示されている。受電機１０の近傍に障害物３０が位置している場合、電波の経路が障害物３０によって遮られることによって、送電機２０からの受電が妨げられうる。 The power transmitter 20 transmits radio waves to the power receiver 10. The power receiver 10 receives radio waves from the power transmitter 20 and receives at least a part of the radio waves. That is, the power receiver 10 receives power from the power transmitter 20. The power receiver 10 may transmit a radio wave including a signal requesting power transmission to the power transmitter 20. A signal for requesting power transmission to the power transmitter 20 is also referred to as a power transmission request signal. An example of a radio wave path between the power receiver 10 and the power transmitter 20 is indicated by a broken line in FIG. When the obstacle 30 is located in the vicinity of the power receiver 10, power reception from the power transmitter 20 can be prevented by blocking the path of the radio wave by the obstacle 30.
　受電機１０は、送信部１１と、受信部１２と、電源部１３と、制御部１４と、検知部１５とを備える。送信部１１は、送電機２０に対して、送電要求信号を送信する。受信部１２は、送電機２０から送信される電波を受信する。電源部１３は、受信部１２で受信した電波の少なくとも一部を電力に変換し、その電力を受電機１０の各構成部に供給する。制御部１４は、受電機１０の各構成部を制御する。検知部１５は、受電機１０の周囲に位置する障害物３０を検知する。 The power receiving machine 10 includes a transmission unit 11, a reception unit 12, a power supply unit 13, a control unit 14, and a detection unit 15. The transmission unit 11 transmits a power transmission request signal to the power transmitter 20. The receiving unit 12 receives radio waves transmitted from the power transmitter 20. The power supply unit 13 converts at least a part of the radio wave received by the receiving unit 12 into electric power, and supplies the electric power to each component of the electric receiver 10. The control unit 14 controls each component of the power receiving machine 10. The detection unit 15 detects an obstacle 30 located around the power receiving machine 10.
　検知部１５は、センサを含んでよい。センサは、近接センサを含んでよい。センサは、種々の情報を検出してよい。センサは、検出した情報に基づいて、受電機１０の周囲の障害物３０の位置、又は、障害物３０までの距離を検知してよい。センサは、周囲に赤外線又は超音波を射出し、障害物３０からの反射を検出してよい。センサは、検知部１５と障害物３０との間に発生する静電容量を検出してよい。センサは、障害物３０によって遮られる環境光の照度の変化を検出してよい。センサは、障害物３０が発する音声を検出してよい。 The detection unit 15 may include a sensor. The sensor may include a proximity sensor. The sensor may detect various information. The sensor may detect the position of the obstacle 30 around the received electrical machine 10 or the distance to the obstacle 30 based on the detected information. The sensor may emit infrared rays or ultrasonic waves to the surroundings to detect reflection from the obstacle 30. The sensor may detect a capacitance generated between the detection unit 15 and the obstacle 30. The sensor may detect a change in illuminance of ambient light that is blocked by the obstacle 30. The sensor may detect a sound emitted from the obstacle 30.
　受信部１２は、検知部１５として機能してよい。受信部１２は、送信部１１が送信した送電要求信号等の信号を含む電波の反射波を受信しうる。受信部１２は、送信部１１が電波を送信したタイミングと、その反射波を受信したタイミングとの差に基づいて、受電機１０の周囲の障害物３０の位置、又は、障害物３０までの距離を検知してよい。送信部１１が電波を送信したタイミングと、その反射波を受信したタイミングとの差は、反射波検出時間ともいう。受信部１２は、反射波検出時間に基づいて、受電機１０と障害物３０との距離を検知しうる。受信部１２は、指向性を有するアンテナを有してよい。受信部１２は、アンテナの指向性に基づいて反射波を受信した方向を特定してよい。受信部１２は、反射波を受信した方向に基づいて、障害物３０の位置を検知しうる。 The receiving unit 12 may function as the detecting unit 15. The receiving unit 12 can receive a reflected wave of a radio wave including a signal such as a power transmission request signal transmitted by the transmitting unit 11. The receiving unit 12 is based on the difference between the timing at which the transmitting unit 11 transmits the radio wave and the timing at which the reflected wave is received, or the position of the obstacle 30 around the receiver 10 or the distance to the obstacle 30. May be detected. The difference between the timing at which the transmission unit 11 transmits radio waves and the timing at which the reflected waves are received is also referred to as reflected wave detection time. The receiving unit 12 can detect the distance between the power receiver 10 and the obstacle 30 based on the reflected wave detection time. The receiving unit 12 may include an antenna having directivity. The receiving unit 12 may specify the direction in which the reflected wave is received based on the directivity of the antenna. The receiving unit 12 can detect the position of the obstacle 30 based on the direction in which the reflected wave is received.
　検知部１５は、外部のカメラ又はセンサ等から情報を取得してよい。外部のカメラは、受電機１０の周囲を撮像してよい。外部のセンサは、受電機１０の周囲に位置する障害物３０を検出してよい。検知部１５は、取得した情報に基づいて、受電機１０の周囲の障害物３０の位置、又は、障害物３０までの距離を検知してよい。 The detection unit 15 may acquire information from an external camera or sensor. The external camera may take an image of the periphery of the power receiver 10. The external sensor may detect the obstacle 30 located around the power receiver 10. The detection unit 15 may detect the position of the obstacle 30 around the received electrical machine 10 or the distance to the obstacle 30 based on the acquired information.
　送電機２０は、送信部２１と、受信部２２と、制御部２３とを備える。送信部２１は、受電機１０に対して、電波を送信する。受信部２２は、受電機１０から送信される電波を受信する。送信部２１及び受信部２２はそれぞれ、アンテナを備えてよい。送信部２１及び受信部２２は、送受信に共通して用いられるアンテナを備えてもよい。受信部２２は、受電機１０から送電要求信号を受信する。制御部２３は、送電要求信号に基づいて、送信部２１に電波を送信させる。受信部２２は、受電機１０から種々の信号を受信してよい。制御部２３は、受電機１０から受信した信号に基づいて、送信部２１に信号を含む電波を送信させてよい。 The power transmitter 20 includes a transmission unit 21, a reception unit 22, and a control unit 23. The transmission unit 21 transmits radio waves to the power receiver 10. The receiving unit 22 receives radio waves transmitted from the power receiver 10. Each of the transmission unit 21 and the reception unit 22 may include an antenna. The transmission unit 21 and the reception unit 22 may include an antenna that is commonly used for transmission and reception. The receiving unit 22 receives a power transmission request signal from the power receiver 10. The control unit 23 causes the transmission unit 21 to transmit radio waves based on the power transmission request signal. The receiving unit 22 may receive various signals from the power receiver 10. The control unit 23 may cause the transmission unit 21 to transmit a radio wave including a signal based on the signal received from the power receiving machine 10.
　無線送電システム１において、受電機１０は、所定の位置に設置されうる。送電機２０の送信部２１は、無指向性のアンテナを有してよい。送信部２１は、無指向性のアンテナによって電波を送信してよい。このようにすることで、送電機２０は、受電機１０が設置される位置にかかわらず、受電機１０に電波を送信できる。 In the wireless power transmission system 1, the power receiver 10 can be installed at a predetermined position. The transmission unit 21 of the power transmission device 20 may include an omnidirectional antenna. The transmission unit 21 may transmit a radio wave using an omnidirectional antenna. By doing so, the power transmitter 20 can transmit radio waves to the power receiver 10 regardless of the position where the power receiver 10 is installed.
　送電機２０の制御部２３は、受電機１０から受電機１０が設置されている位置に関する情報を取得してよい。送信部２１は、指向性を有するアンテナを有し、指向性を有する電波を送信してよい。制御部２３は、受電機１０が設置されている位置に関する情報に基づいて、送信部２１に、受電機１０に向けて指向性を有する電波を送信させてよい。つまり、制御部２３は、送信する電波をビームフォーミングしてよい。受電機１０に向けて指向性を有する電波は、無指向性の電波と比べて、より高い強度で受電機１０に到達しうる。このようにすることで、送電機２０は、受電機１０に到達する電波の強度を制御しうる。 The control unit 23 of the power transmission device 20 may acquire information regarding the position where the power receiver 10 is installed from the power receiver 10. The transmission unit 21 may include an antenna having directivity and transmit a radio wave having directivity. The control unit 23 may cause the transmission unit 21 to transmit a directional radio wave toward the power receiving device 10 based on the information regarding the position where the power receiving device 10 is installed. That is, the control unit 23 may perform beam forming on the radio wave to be transmitted. A radio wave having directivity toward the power receiver 10 can reach the power receiver 10 with higher intensity than a non-directional radio wave. By doing in this way, the power transmission device 20 can control the intensity of the radio wave reaching the power receiver 10.
　受電機１０は、送電要求信号を含む電波を送信してよい。送電要求信号は、受電機１０が設置されている位置に関する情報を含んでよい。送電機２０の受信部２２は、送電要求信号を含む電波を受信してよい。制御部２３は、受信部２２で受信した電波に含まれる送電要求信号に基づいて、受電機１０の位置を取得してよい。受信部２２は、指向性を有するアンテナを有してよい。受信部２２は、指向性を有するアンテナによって、送電要求信号を含む電波がどの方向から送電機２０に到達したか検出してよい。制御部２３は、受信部２２で検出された、送電要求信号を含む電波が到達した方向に関する情報を取得してよい。制御部２３は、受電機１０が設置されている位置に関する情報として、送電要求信号を含む電波が到達した方向に関する情報を取得してよい。 The power receiving machine 10 may transmit a radio wave including a power transmission request signal. The power transmission request signal may include information related to the position where the power receiver 10 is installed. The receiver 22 of the power transmitter 20 may receive a radio wave including a power transmission request signal. The control unit 23 may acquire the position of the power receiving machine 10 based on the power transmission request signal included in the radio wave received by the receiving unit 22. The receiving unit 22 may include an antenna having directivity. The receiving unit 22 may detect from which direction the radio wave including the power transmission request signal has reached the power transmitter 20 by using an antenna having directivity. The control unit 23 may acquire information regarding the direction in which the radio wave including the power transmission request signal has been detected, which is detected by the reception unit 22. The control unit 23 may acquire information regarding the direction in which the radio wave including the power transmission request signal has arrived as information regarding the position where the power receiving device 10 is installed.
　制御部２３は、送電要求信号を含む電波が到達した方向に向けて電波をビームフォーミングしてよい。送電要求信号を含む電波が２つ以上の方向から到達する場合、制御部２３は、それぞれの方向に電波をビームフォーミングしてよい。制御部２３は、送信部２１に送信させる電波をビームフォーミングする方向を、時分割で制御してよい。制御部２３は、例えば図１に示されるリモコン１０ａ及び時計１０ｂそれぞれに対して送信する電波を時分割でビームフォーミングしてよい。 The control unit 23 may beam-form the radio wave in the direction in which the radio wave including the power transmission request signal has arrived. When the radio wave including the power transmission request signal arrives from two or more directions, the control unit 23 may beam-form the radio wave in each direction. The control unit 23 may control the direction in which the radio wave to be transmitted to the transmission unit 21 is beam-formed in a time division manner. For example, the control unit 23 may beam-form the radio waves transmitted to the remote controller 10a and the timepiece 10b shown in FIG. 1 in a time division manner.
　障害物３０が送電機２０から受電機１０までの電波の経路に位置する場合、送電機２０から送信される電波は、受電機１０に到達しにくくなる。障害物３０が受電機１０の近傍に位置する場合、送電機２０から送信される電波は、受電機１０に、より一層到達しにくくなる。つまり、障害物３０は、受電機１０における受電を妨げうる。 When the obstacle 30 is located on the radio wave path from the power transmitter 20 to the power receiver 10, the radio wave transmitted from the power transmitter 20 is difficult to reach the power receiver 10. When the obstacle 30 is located in the vicinity of the power receiver 10, the radio wave transmitted from the power transmitter 20 is more difficult to reach the power receiver 10. That is, the obstacle 30 can prevent power reception in the power receiving machine 10.
　障害物３０の位置が、受電機１０の位置を基準として表されると仮定する。障害物３０が受電機１０の周囲に位置する場合に受電機１０が受電する電力が第１電力であると仮定する。障害物３０が受電機１０の周囲に存在しない場合に受電機１０が受電する電力が第２電力であると仮定する。障害物３０が受電機１０の受電を妨げる場合、第１電力は、第２電力に対して所定の割合未満にまで減少しうる。障害物３０が第１電力を第２電力に対して所定の割合未満にまで減少させる場合における障害物３０の位置の集合は、所定範囲ともいう。つまり、障害物３０が受電機１０の位置を基準として所定範囲内に接近している場合に受電機１０が受電する電力は、障害物３０が受電機１０の周囲に存在しない場合に受電機１０が受電する電力に対して所定の割合未満にまで減少する。所定範囲は、受電機１０から所定距離内の範囲であってもよい。 Suppose that the position of the obstacle 30 is expressed with reference to the position of the receiver 10. It is assumed that the power received by the power receiver 10 is the first power when the obstacle 30 is located around the power receiver 10. It is assumed that the power received by the power receiver 10 when the obstacle 30 is not present around the power receiver 10 is the second power. When the obstacle 30 prevents the power reception by the power receiving device 10, the first power can be reduced to less than a predetermined ratio with respect to the second power. A set of positions of the obstacles 30 when the obstacle 30 reduces the first power to less than a predetermined ratio with respect to the second power is also referred to as a predetermined range. That is, the power received by the power receiver 10 when the obstacle 30 is close to a predetermined range with respect to the position of the power receiver 10 is the power received by the power receiver 10 when the obstacle 30 is not present around the power receiver 10. Decreases to less than a predetermined ratio with respect to the power received. The predetermined range may be a range within a predetermined distance from the power receiver 10.
　本実施形態に係る無線送電システム１において、送電機２０は、障害物３０が受電機１０から所定範囲内に接近していない場合に、受電機１０に送電する。この場合、障害物３０が受電機１０から所定範囲内に接近している場合と比較して、送電機２０から送信される電波は、受電機１０に到達しやすい。結果として、送受電の有用性が高められうる。送電機２０は、障害物３０と受電機１０との距離が所定距離以上である場合に、受電機１０に送電してよい。この場合も、送電機２０から送信される電波は、受電機１０に到達しやすい。送電機２０は、障害物３０が受電機１０から所定距離内に接近していない場合に、受電機１０に送電してよい。送電機２０は、障害物３０と受電機１０との距離に基づくことによって、送電するか否かをより容易に決定しうる。 In the wireless power transmission system 1 according to the present embodiment, the power transmitter 20 transmits power to the power receiver 10 when the obstacle 30 is not approaching the predetermined range from the power receiver 10. In this case, the radio wave transmitted from the power transmitter 20 is likely to reach the power receiver 10 as compared to the case where the obstacle 30 is approaching within a predetermined range from the power receiver 10. As a result, the utility of power transmission / reception can be enhanced. The power transmitter 20 may transmit power to the power receiver 10 when the distance between the obstacle 30 and the power receiver 10 is equal to or greater than a predetermined distance. Also in this case, the radio wave transmitted from the power transmitter 20 easily reaches the power receiver 10. The power transmitter 20 may transmit power to the power receiver 10 when the obstacle 30 is not approaching within a predetermined distance from the power receiver 10. The power transmission device 20 can more easily determine whether to transmit power based on the distance between the obstacle 30 and the power receiving device 10.
　障害物３０は、種々の物体でありうる。障害物３０は、種々の機器でありうる。障害物３０は、電波を送受信する種々の機器でありうる。障害物３０は、ロボット、ラジコン又はドローン等の移動体でありうる。障害物３０は、人間又は動物等の生体でありうる。 The obstacle 30 can be various objects. The obstacle 30 can be various devices. The obstacle 30 can be various devices that transmit and receive radio waves. The obstacle 30 may be a moving body such as a robot, a radio control, or a drone. The obstacle 30 may be a living body such as a human being or an animal.
　障害物３０が受電機１０から所定範囲内に接近している場合、送電機２０から送信された電波によって、障害物３０の動作が妨げられうる。例えば障害物３０が電波を送受信する機器である場合、送電機２０の電波によって、その機器の電波の送受信が妨げられうる。つまり、無線送電システム１が通信障害を生じさせうる。本実施形態に係る無線送電システム１において、障害物３０が受電機１０から所定範囲内に接近している場合、送電機２０は、電波を送信しない、又は、送信する電波の強度を低減する。つまり、送電機２０が電波を送信しない、又は、送信する電波の強度を低減する条件は、障害物３０が受電機１０から所定範囲内に接近している場合を含む。送電機２０が電波を送信しない、又は、送信する電波の強度を低減する条件は、障害物３０と受電機１０との距離が所定距離以下である場合を含んでよい。送電機２０が障害物３０の位置に基づいて電波を送信しない、又は、送信する電波の強度を低減することによって、送受電動作が障害物３０の動作を妨げにくくなったり、通信障害を引き起こしにくくなったりする。結果として、送受電の有用性が高められうる。 When the obstacle 30 is approaching within a predetermined range from the power receiver 10, the operation of the obstacle 30 can be hindered by the radio wave transmitted from the power transmitter 20. For example, when the obstacle 30 is a device that transmits and receives radio waves, the radio waves of the power transmitter 20 can prevent the devices from transmitting and receiving radio waves. That is, the wireless power transmission system 1 can cause a communication failure. In the wireless power transmission system 1 according to the present embodiment, when the obstacle 30 is approaching within a predetermined range from the power receiver 10, the power transmitter 20 does not transmit radio waves or reduces the intensity of radio waves to be transmitted. That is, the condition that the power transmitter 20 does not transmit radio waves or reduces the intensity of the radio waves to be transmitted includes a case where the obstacle 30 is approaching within a predetermined range from the receiver 10. The condition that the power transmitter 20 does not transmit radio waves or reduces the intensity of radio waves to be transmitted may include a case where the distance between the obstacle 30 and the receiver 10 is equal to or less than a predetermined distance. The power transmission device 20 does not transmit radio waves based on the position of the obstacle 30 or reduces the strength of the radio waves to be transmitted, so that the power transmission / reception operation does not easily disturb the operation of the obstacle 30 or hardly causes communication failure. It becomes. As a result, the utility of power transmission / reception can be enhanced.
　無線送電システム１は、図３に示される手順を実行することによって、障害物３０が受電機１０から所定範囲内に接近している場合に、送電機２０に送電を停止させてよい。 The wireless power transmission system 1 may cause the power transmitter 20 to stop power transmission when the obstacle 30 is approaching within a predetermined range from the power receiver 10 by executing the procedure shown in FIG.
　受電機１０は、検知部１５によって、障害物３０を検知する（ステップＳ１１）。検知部１５は、障害物３０が受電機１０の周囲に位置しているか検知する。検知部１５は、障害物３０の位置を検知してよい。検知部１５は、障害物３０と受電機１０との距離を検知してよい。 The electric receiving machine 10 detects the obstacle 30 by the detection unit 15 (step S11). The detection unit 15 detects whether the obstacle 30 is located around the power receiving machine 10. The detection unit 15 may detect the position of the obstacle 30. The detection unit 15 may detect the distance between the obstacle 30 and the power receiver 10.
　検知部１５がセンサである場合、検知部１５は、センサによって障害物３０を検知してよい。受信部１２が検知部１５として機能する場合、受信部１２は、反射波検出時間に基づいて、障害物３０を検知してよい。検知部１５が外部のカメラ又はセンサ等から情報を取得する場合、検知部１５は、取得した情報に基づいて障害物３０の位置を検知してよい。 When the detection unit 15 is a sensor, the detection unit 15 may detect the obstacle 30 by the sensor. When the reception unit 12 functions as the detection unit 15, the reception unit 12 may detect the obstacle 30 based on the reflected wave detection time. When the detection unit 15 acquires information from an external camera or sensor, the detection unit 15 may detect the position of the obstacle 30 based on the acquired information.
　受電機１０は、障害物３０が受電機１０から所定範囲内に接近しているか判定する（ステップＳ１２）。受電機１０は、検知部１５によって検知された障害物３０の位置に基づいて、障害物３０が受電機１０から所定範囲内に接近しているか判定する。受電機１０は、検知部１５によって検知された障害物３０と受電機１０との距離が所定距離未満であるか判定してもよい。 The receiving device 10 determines whether the obstacle 30 is approaching within a predetermined range from the receiving device 10 (step S12). Based on the position of the obstacle 30 detected by the detection unit 15, the power receiving machine 10 determines whether the obstacle 30 is approaching within a predetermined range from the power receiving machine 10. The power receiving device 10 may determine whether the distance between the obstacle 30 detected by the detection unit 15 and the power receiving device 10 is less than a predetermined distance.
　受電機１０は、障害物３０が受電機１０から所定範囲内に接近していない場合（ステップＳ１２：ＮＯ）、ステップＳ１４の手順に進む。つまり、受電機１０は、障害物３０が所定範囲内に接近していない場合、送電停止信号を送信しない。受電機１０は、障害物３０が受電機１０から所定範囲内に接近している場合（ステップＳ１２：ＹＥＳ）、送電機２０に、送電停止信号を送信する（ステップＳ１３）。受電機１０は、ステップＳ１３の手順の後、図３のフローチャートの手順を終了する。 When the obstacle 30 has not approached the predetermined range from the receiver 10 (step S12: NO), the receiver 10 proceeds to the procedure of step S14. That is, the power receiving machine 10 does not transmit a power transmission stop signal when the obstacle 30 is not approaching the predetermined range. When the obstacle 30 is approaching within a predetermined range from the power receiver 10 (step S12: YES), the power receiver 10 transmits a power transmission stop signal to the power transmitter 20 (step S13). The power receiving machine 10 ends the procedure of the flowchart of FIG. 3 after the procedure of step S13.
　一方、送電機２０は、送電停止信号を受信したか判定する（ステップＳ２１）。送電機２０は、送電停止信号を受信した場合（ステップＳ２１：ＹＥＳ）、図３のフローチャートの手順を終了する。つまり、送電機２０は、送電停止信号を受信した場合、電波の送信による受電機１０への送電を停止する。送電機２０は、送電停止信号を受信していない場合（ステップＳ２１：ＮＯ）、ステップＳ２２の手順に進む。 On the other hand, the power transmitter 20 determines whether a power transmission stop signal has been received (step S21). When the power transmission device 20 receives the power transmission stop signal (step S21: YES), the power transmission device 20 ends the procedure of the flowchart of FIG. That is, when the power transmission device 20 receives a power transmission stop signal, the power transmission device 20 stops power transmission to the power receiving machine 10 by transmission of radio waves. When the power transmission device 20 has not received the power transmission stop signal (step S21: NO), the power transmission device 20 proceeds to the procedure of step S22.
　受電機１０は、送電機２０に、送電要求信号を送信する（ステップＳ１４）。 The power receiving machine 10 transmits a power transmission request signal to the power transmitter 20 (step S14).
　一方、送電機２０は、送電要求信号を受信したか判定する（ステップＳ２２）。送電機２０は、送電要求信号を受信していない場合（ステップＳ２２：ＮＯ）、図３のフローチャートの手順を終了する。つまり、送電機２０は、送電要求信号を受信していない場合、受電機１０に送電しない。 On the other hand, the power transmitter 20 determines whether a power transmission request signal has been received (step S22). When the power transmission device 20 has not received the power transmission request signal (step S22: NO), the procedure of the flowchart of FIG. 3 ends. That is, the power transmitter 20 does not transmit power to the receiver 10 when it does not receive the power transmission request signal.
　送電機２０は、送電要求信号を受信した場合（ステップＳ２２：ＹＥＳ）、受電機１０へ送電する（ステップＳ２３）。送電機２０は、ステップＳ２３の後、図３のフローチャートの手順を終了する。一方、受電機１０は、送電機２０から受電する（ステップＳ１５）。受電機１０は、ステップＳ１５の後、図３のフローチャートの手順を終了する。 When the power transmitter 20 receives the power transmission request signal (step S22: YES), the power transmitter 20 transmits power to the receiver 10 (step S23). The power transmitter 20 ends the procedure of the flowchart of FIG. 3 after step S23. On the other hand, the power receiver 10 receives power from the power transmitter 20 (step S15). The power receiving machine 10 ends the procedure of the flowchart of FIG. 3 after step S15.
　無線送電システム１は、図４に示される手順を実行することによって、障害物３０が受電機１０から所定範囲内に接近している場合に、送電機２０から送電する電力を低減させてよい。 The wireless power transmission system 1 may reduce the power transmitted from the power transmitter 20 when the obstacle 30 is approaching within a predetermined range from the power receiver 10 by executing the procedure shown in FIG.
　受電機１０は、検知部１５によって、障害物３０を検知する（ステップＳ３１）。受電機１０は、図３のステップＳ１１の手順と同一又は類似の手順を実行してよい。 The electric receiving machine 10 detects the obstacle 30 by the detection unit 15 (step S31). The power receiving machine 10 may execute the same or similar procedure as the procedure of step S11 of FIG.
　受電機１０は、障害物３０が受電機１０から所定範囲内に接近しているか判定する（ステップＳ３２）。受電機１０は、図３のステップＳ１２の手順と同一又は類似の手順を実行してよい。 The receiving device 10 determines whether the obstacle 30 is approaching within a predetermined range from the receiving device 10 (step S32). The power receiving machine 10 may execute the same or similar procedure as the procedure of step S12 of FIG.
　受電機１０は、障害物３０が受電機１０から所定範囲内に接近していない場合（ステップＳ３２：ＮＯ）、ステップＳ３４の手順に進む。つまり、受電機１０は、障害物３０が所定範囲内に接近していない場合、送電低減信号を送信しない。受電機１０は、障害物３０が受電機１０から所定範囲内に接近している場合（ステップＳ３２：ＹＥＳ）、送電機２０に、送電低減信号を送信する（ステップＳ３３）。送電低減信号は、送電機２０に対して、送電する電力を低減するように指示する制御情報を含む。受電機１０は、ステップＳ３３の手順の後、ステップＳ３４の手順に進む。 When the obstacle 30 has not approached the predetermined range from the receiver 10 (step S32: NO), the receiver 10 proceeds to the procedure of step S34. That is, the power receiving machine 10 does not transmit a power transmission reduction signal when the obstacle 30 is not approaching the predetermined range. When the obstacle 30 is approaching within a predetermined range from the power receiver 10 (step S32: YES), the power receiver 10 transmits a power transmission reduction signal to the power transmitter 20 (step S33). The power transmission reduction signal includes control information that instructs the power transmitter 20 to reduce the power to be transmitted. The electric receiver 10 proceeds to the procedure of step S34 after the procedure of step S33.
　一方、送電機２０は、送電低減信号を受信したか判定する（ステップＳ４１）。送電機２０は、送電低減信号を受信していない場合（ステップＳ４１：ＮＯ）、ステップＳ４３の手順に進む。送電機２０は、送電低減信号を受信した場合（ステップＳ４１：ＹＥＳ）、受電機１０に送電するために送信する電波の強度を低減させるように設定する（ステップＳ４２）。つまり、送電機２０は、送電低減信号を受信した場合、受電機１０へ送電する電力を低減させる。送電機２０は、ステップＳ４２の後、ステップＳ４３の手順に進む。 On the other hand, the power transmitter 20 determines whether a power transmission reduction signal has been received (step S41). When the power transmission device 20 has not received the power transmission reduction signal (step S41: NO), the power transmission device 20 proceeds to the procedure of step S43. When the power transmission device 20 receives the power transmission reduction signal (step S41: YES), the power transmission device 20 is set to reduce the intensity of the radio wave transmitted to transmit power to the receiver 10 (step S42). That is, the power transmitter 20 reduces the power transmitted to the receiver 10 when receiving the power transmission reduction signal. The power transmitter 20 proceeds to step S43 after step S42.
　受電機１０は、送電機２０に、送電要求信号を送信する（ステップＳ３４）。 The power receiving machine 10 transmits a power transmission request signal to the power transmitter 20 (step S34).
　一方、送電機２０は、送電要求信号を受信したか判定する（ステップＳ４３）。送電機２０は、送電要求信号を受信していない場合（ステップＳ４３：ＮＯ）、図４のフローチャートの手順を終了する。つまり、送電機２０は、送電要求信号を受信していない場合、受電機１０に送電しない。 On the other hand, the power transmitter 20 determines whether a power transmission request signal has been received (step S43). When the power transmission device 20 has not received the power transmission request signal (step S43: NO), the procedure of the flowchart of FIG. 4 ends. That is, the power transmitter 20 does not transmit power to the receiver 10 when it does not receive the power transmission request signal.
　送電機２０は、送電要求信号を受信した場合（ステップＳ４３：ＹＥＳ）、受電機１０へ送電する（ステップＳ４４）。送電機２０は、設定に基づく強度を有する電波を送信することによって、受電機１０へ送電する。つまり、送電機２０は、電波の強度を低減させるように設定している場合、低減した電力を送電する。送電機２０は、ステップＳ４４の後、図４のフローチャートの手順を終了する。一方、受電機１０は、送電機２０から受電する（ステップＳ３５）。受電機１０は、ステップＳ３５の後、図４のフローチャートの手順を終了する。 When the power transmitter 20 receives the power transmission request signal (step S43: YES), the power transmitter 20 transmits power to the receiver 10 (step S44). The power transmitter 20 transmits power to the power receiver 10 by transmitting a radio wave having an intensity based on the setting. That is, when the power transmitter 20 is set to reduce the intensity of radio waves, the power transmitter 20 transmits the reduced power. The power transmitter 20 ends the procedure of the flowchart of FIG. 4 after step S44. On the other hand, the power receiver 10 receives power from the power transmitter 20 (step S35). The power receiving machine 10 ends the procedure of the flowchart of FIG. 4 after step S35.
　無線送電システム１は、図３のステップＳ１３において送電停止信号を送電機２０に送信した場合、図５に示される手順を実行することによって、送電機２０に送電を再開させてよい。 When the wireless power transmission system 1 transmits a power transmission stop signal to the power transmitter 20 in step S13 of FIG. 3, the wireless power transmission system 1 may restart the power transmission by executing the procedure illustrated in FIG. 5.
　受電機１０は、検知部１５によって、障害物３０を検知する（ステップＳ５１）。受電機１０は、図３のステップＳ１１の手順と同一又は類似の手順を実行してよい。 The electric receiving machine 10 detects the obstacle 30 by the detection unit 15 (step S51). The power receiving machine 10 may execute the same or similar procedure as the procedure of step S11 of FIG.
　受電機１０は、障害物３０が受電機１０から所定範囲外に移動したか判定する（ステップＳ５２）。受電機１０は、検知部１５によって検知された障害物３０の位置に基づいて、障害物３０が受電機１０から所定範囲外に移動したか判定する。受電機１０は、障害物３０が受電機１０から所定範囲内に接近している状態から、障害物３０が受電機１０から所定範囲外に移動した状態に遷移したか判定してよい。受電機１０は、障害物３０と受電機１０との距離が所定距離以上となったか判定してもよい。 The receiving device 10 determines whether the obstacle 30 has moved out of the predetermined range from the receiving device 10 (step S52). Based on the position of the obstacle 30 detected by the detection unit 15, the receiving device 10 determines whether the obstacle 30 has moved out of the predetermined range from the receiving device 10. The power receiver 10 may determine whether the obstacle 30 has transitioned from a state in which the obstacle 30 is approaching within a predetermined range from the power receiver 10 to a state in which the obstacle 30 has moved out of the predetermined range from the power receiver 10. The power receiver 10 may determine whether the distance between the obstacle 30 and the power receiver 10 is equal to or greater than a predetermined distance.
　受電機１０は、障害物３０が受電機１０から所定範囲外に移動していない場合（ステップＳ５２：ＮＯ）、図５のフローチャートの手順を終了する。つまり、受電機１０は、障害物３０が所定範囲内にとどまっている間、送電機２０に対して送電再開信号を送信しない。受電機１０は、障害物３０が受電機１０から所定範囲外に移動した場合（ステップＳ５２：ＹＥＳ）、送電機２０に、送電再開信号を送信する（ステップＳ５３）。 When the obstacle 30 has not moved out of the predetermined range from the receiver 10 (step S52: NO), the receiver 10 ends the procedure of the flowchart of FIG. That is, the power receiving device 10 does not transmit a power transmission restart signal to the power transmitter 20 while the obstacle 30 remains within the predetermined range. When the obstacle 30 moves out of the predetermined range from the power receiver 10 (step S52: YES), the power receiver 10 transmits a power transmission restart signal to the power transmitter 20 (step S53).
　一方、送電機２０は、送電再開信号を受信したか判定する（ステップＳ６１）。送電機２０は、送電再開信号を受信していない場合（ステップＳ６１：ＮＯ）、図５のフローチャートの手順を終了する。送電機２０は、送電再開信号を受信した場合（ステップＳ６１：ＹＥＳ）、ステップＳ６２の手順に進む。 On the other hand, the power transmitter 20 determines whether a power transmission resumption signal has been received (step S61). When the power transmission device 20 has not received the power transmission resumption signal (step S61: NO), the procedure of the flowchart of FIG. When the power transmitter 20 receives the power transmission restart signal (step S61: YES), the power transmitter 20 proceeds to the procedure of step S62.
　受電機１０は、送電機２０に、送電要求信号を送信する（ステップＳ５４）。 The power receiving machine 10 transmits a power transmission request signal to the power transmitter 20 (step S54).
　一方、送電機２０は、送電要求信号を受信したか判定する（ステップＳ６２）。送電機２０は、送電要求信号を受信していない場合（ステップＳ６２：ＮＯ）、図５のフローチャートの手順を終了する。つまり、送電機２０は、送電要求信号を受信していない場合、受電機１０に送電しない。 On the other hand, the power transmitter 20 determines whether a power transmission request signal has been received (step S62). When the power transmission device 20 has not received the power transmission request signal (step S62: NO), the procedure of the flowchart of FIG. That is, the power transmitter 20 does not transmit power to the receiver 10 when it does not receive the power transmission request signal.
　送電機２０は、送電要求信号を受信した場合（ステップＳ６２：ＹＥＳ）、受電機１０へ送電する（ステップＳ６３）。送電機２０は、ステップＳ６３の後、図５のフローチャートの手順を終了する。一方、受電機１０は、送電機２０から受電する（ステップＳ５５）。受電機１０は、ステップＳ５５の後、図５のフローチャートの手順を終了する。 When the power transmitter 20 receives the power transmission request signal (step S62: YES), the power transmitter 20 transmits power to the receiver 10 (step S63). The power transmitter 20 ends the procedure of the flowchart of FIG. 5 after step S63. On the other hand, the power receiver 10 receives power from the power transmitter 20 (step S55). The power receiving machine 10 ends the procedure of the flowchart of FIG. 5 after step S55.
　無線送電システム１は、図４のステップＳ３３において送電低減信号を送電機２０に送信した場合、図６に示される手順を実行することによって、送電機２０から送電する電力を増加させてよい。 When the wireless power transmission system 1 transmits the power transmission reduction signal to the power transmitter 20 in step S33 of FIG. 4, the wireless power transmission system 1 may increase the power transmitted from the power transmitter 20 by executing the procedure illustrated in FIG. 6.
　受電機１０は、検知部１５によって、障害物３０を検知する（ステップＳ７１）。受電機１０は、図３のステップＳ１１の手順と同一又は類似の手順を実行してよい。 The electric receiving machine 10 detects the obstacle 30 by the detection unit 15 (step S71). The power receiving machine 10 may execute the same or similar procedure as the procedure of step S11 of FIG.
　受電機１０は、障害物３０が受電機１０から所定範囲外に移動したか判定する（ステップＳ７２）。受電機１０は、図５のステップＳ５２の手順と同一又は類似の手順を実行してよい。 The receiving device 10 determines whether the obstacle 30 has moved out of the predetermined range from the receiving device 10 (step S72). The power receiving machine 10 may execute the same or similar procedure as the procedure of step S52 of FIG.
　受電機１０は、障害物３０が受電機１０から所定範囲外に移動していない場合（ステップＳ７２：ＮＯ）、ステップＳ７４の手順に進む。つまり、受電機１０は、障害物３０が所定範囲内にとどまっている間、送電機２０に対して送電増加信号を送信しない。受電機１０は、障害物３０が受電機１０から所定範囲外に移動した場合（ステップＳ７２：ＹＥＳ）、送電機２０に、送電増加信号を送信する（ステップＳ７３）。 When the obstacle 30 has not moved out of the predetermined range from the receiver 10 (step S72: NO), the receiver 10 proceeds to the procedure of step S74. That is, the power receiving machine 10 does not transmit a power transmission increase signal to the power transmitter 20 while the obstacle 30 remains within the predetermined range. When the obstacle 30 moves out of the predetermined range from the power receiver 10 (step S72: YES), the power receiver 10 transmits a power transmission increase signal to the power transmitter 20 (step S73).
　一方、送電機２０は、送電増加信号を受信したか判定する（ステップＳ８１）。送電機２０は、送電増加信号を受信していない場合（ステップＳ８１：ＮＯ）、ステップＳ８３の手順に進む。送電機２０は、送電増加信号を受信した場合（ステップＳ８１：ＹＥＳ）、電波の強度を増加させるように自機を設定する。送電機２０は、ステップＳ８２の後、ステップＳ８３の手順に進む。 On the other hand, the power transmitter 20 determines whether a power transmission increase signal has been received (step S81). When the power transmitter 20 has not received the power transmission increase signal (step S81: NO), the power transmitter 20 proceeds to the procedure of step S83. When the power transmission device 20 receives a power transmission increase signal (step S81: YES), the power transmission device 20 sets itself so as to increase the strength of the radio wave. The power transmitter 20 proceeds to the procedure of Step S83 after Step S82.
　受電機１０は、送電機２０に、送電要求信号を送信する（ステップＳ７４）。 The power receiving machine 10 transmits a power transmission request signal to the power transmitter 20 (step S74).
　一方、送電機２０は、送電要求信号を受信したか判定する（ステップＳ８３）。送電機２０は、送電要求信号を受信していない場合（ステップＳ８３：ＮＯ）、図６のフローチャートの手順を終了する。つまり、送電機２０は、送電要求信号を受信していない場合、受電機１０に送電しない。 Meanwhile, the power transmitter 20 determines whether a power transmission request signal has been received (step S83). When the power transmission device 20 has not received the power transmission request signal (step S83: NO), the procedure of the flowchart of FIG. 6 ends. That is, the power transmitter 20 does not transmit power to the receiver 10 when it does not receive the power transmission request signal.
　送電機２０は、送電要求信号を受信した場合（ステップＳ８３：ＹＥＳ）、受電機１０へ送電する（ステップＳ８４）。送電機２０は、ステップＳ８４の後、図６のフローチャートの手順を終了する。一方、受電機１０は、送電機２０から受電する（ステップＳ７５）。受電機１０は、ステップＳ７５の後、図６のフローチャートの手順を終了する。 When the power transmitter 20 receives the power transmission request signal (step S83: YES), the power transmitter 20 transmits power to the receiver 10 (step S84). The power transmitter 20 ends the procedure of the flowchart of FIG. 6 after step S84. On the other hand, the power receiver 10 receives power from the power transmitter 20 (step S75). The power receiving machine 10 ends the procedure of the flowchart of FIG. 6 after step S75.
　図３～図６に示される手順で用いられている、送電停止信号、送電再開信号、送電低減信号、及び送電増加信号は、送電機２０からの送電電力の大きさを所定値とするように指示する信号とみなされうる。例えば、送電停止信号における所定値は０とされうる。送電低減信号における所定値は、信号送信前の送電電力に対して小さい値とされうる。送電増加信号における所定値は、信号送信前の送電電力に対して大きい値とされうる。例えば、送電再開信号における所定値は、送電停止信号が送信される直前の送電電力に対応する値とされてよいし、他の任意の値とされてもよい。 The power transmission stop signal, power transmission restart signal, power transmission reduction signal, and power transmission increase signal used in the procedures shown in FIGS. 3 to 6 are set so that the magnitude of the transmission power from the power transmitter 20 is a predetermined value. It can be regarded as an indicating signal. For example, the predetermined value in the power transmission stop signal can be zero. The predetermined value in the power transmission reduction signal can be a small value with respect to the transmission power before signal transmission. The predetermined value in the power transmission increase signal can be a large value with respect to the transmission power before signal transmission. For example, the predetermined value in the power transmission restart signal may be a value corresponding to the transmitted power immediately before the transmission stop signal is transmitted, or may be any other value.
　図３～図６に示されるフローチャートの手順は、適宜組み合わされてよい。送電停止信号が送信された後、送電再開信号だけでなく送電増加信号等の他の信号が送信されてもよい。送電低減信号が送信された後、送電増加信号だけでなく送電停止信号又は送電再開信号等の他の信号が送信されてもよい。つまり、受電機１０は、障害物３０の検知結果に基づいて、種々の信号を組み合わせて送信してよい。 The procedures in the flowcharts shown in FIGS. 3 to 6 may be combined as appropriate. After the power transmission stop signal is transmitted, not only the power transmission restart signal but also other signals such as a power transmission increase signal may be transmitted. After the power transmission reduction signal is transmitted, not only a power transmission increase signal but also other signals such as a power transmission stop signal or a power transmission restart signal may be transmitted. That is, the electric receiver 10 may transmit various signals in combination based on the detection result of the obstacle 30.
　本実施形態に係る無線送電システム１は、受電機１０から所定範囲内に障害物３０が接近している場合に、送電機２０に送電を停止させたり、送電機２０から送電する電力を低減させたりする。このようにすることで、受電機１０における受電効率が高められうる。結果として、送受電の有用性が高められうる。 The wireless power transmission system 1 according to the present embodiment causes the power transmitter 20 to stop power transmission or reduce the power transmitted from the power transmitter 20 when an obstacle 30 is approaching within a predetermined range from the power receiver 10. Or By doing in this way, the power receiving efficiency in the receiving device 10 can be improved. As a result, the utility of power transmission / reception can be enhanced.
　本開示に係る実施形態について、諸図面及び実施例に基づき説明してきたが、当業者であれば本開示に基づき種々の変形又は修正を行うことが容易であることに注意されたい。従って、これらの変形又は修正は本開示の範囲に含まれることに留意されたい。例えば、各構成部又は各ステップなどに含まれる機能などは論理的に矛盾しないように再配置可能であり、複数の構成部又はステップなどを１つに組み合わせたり、或いは分割したりすることが可能である。本開示に係る実施形態について装置を中心に説明してきたが、本開示に係る実施形態は装置の各構成部が実行するステップを含む方法としても実現し得るものである。本開示に係る実施形態は装置が備えるプロセッサにより実行される方法、プログラム、又はプログラムを記録した記憶媒体としても実現し得るものである。本開示の範囲にはこれらも包含されるものと理解されたい。 Although the embodiments according to the present disclosure have been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications or corrections based on the present disclosure. Accordingly, it should be noted that these variations or modifications are included in the scope of the present disclosure. For example, functions included in each component or step can be rearranged so as not to be logically contradictory, and a plurality of components or steps can be combined into one or divided. It is. Although the embodiment according to the present disclosure has been described centering on an apparatus, the embodiment according to the present disclosure can also be realized as a method including steps executed by each component of the apparatus. The embodiment according to the present disclosure can also be realized as a method, a program, or a storage medium storing a program executed by a processor included in the apparatus. It should be understood that these are included within the scope of the present disclosure.
　１　無線送電システム
　１０　受電機
　１１　送信部
　１２　受信部
　１３　電源部
　１４　制御部
　１５　検知部
　２０　送電機
　２１　送信部
　２２　受信部
　２３　制御部
　３０　障害物 DESCRIPTION OF SYMBOLS 1 Wireless power transmission system 10 Electric power receiver 11 Transmission part 12 Reception part 13 Power supply part 14 Control part 15 Detection part 20 Power transmitter 21 Transmission part 22 Reception part 23 Control part 30 Obstacle

Claims (14)

  1. 　電波によって送電する送電機と、
    　前記送電機からの電波を受電する受電機と
    を備え、
    　前記受電機は、障害物が自機から所定範囲内に接近しているか検知する検知部を有し、
    　前記障害物が前記受電機から前記所定範囲内に接近していると前記検知部が検知した場合、前記送電機は、前記受電機へ送電する電力の低減、及び、前記受電機への送電の停止のいずれかを実行する、
    無線送電システム。     A power transmitter for transmitting by radio waves;
    A power receiving device for receiving radio waves from the power transmitter,
    The power receiver has a detection unit that detects whether an obstacle is approaching within a predetermined range from the own machine,
    When the detection unit detects that the obstacle is approaching within the predetermined range from the power receiver, the power transmitter reduces power transmitted to the power receiver and transmits power to the power receiver. Perform one of the stops,
    Wireless power transmission system.
  2. 　前記受電機は、前記送電機に対して、送電要求信号を送信し、
    　前記送電機は、前記送電要求信号が到達した方向に向けて、前記電波をビームフォーミングする、請求項１に記載の無線送電システム。     The power receiver transmits a power transmission request signal to the power transmitter,
    The wireless power transmission system according to claim 1, wherein the power transmitter beam-forms the radio wave in a direction in which the power transmission request signal has arrived.
  3. 　前記障害物が前記受電機から前記所定範囲内に接近していると前記検知部が検知した場合、前記受電機は、前記送電要求信号の送信を停止する、請求項２に記載の無線送電システム。 The wireless power transmission system according to claim 2, wherein when the detection unit detects that the obstacle is approaching within the predetermined range from the power receiving device, the power receiving device stops transmitting the power transmission request signal. .
  4. 　前記検知部は、前記送電要求信号の反射に基づき、前記障害物が前記受電機から前記所定範囲内に接近しているか検知する、請求項２又は３に記載の無線送電システム。 The wireless power transmission system according to claim 2 or 3, wherein the detection unit detects whether the obstacle is approaching within the predetermined range from the power receiving device based on reflection of the power transmission request signal.
  5. 　前記障害物が前記受電機から前記所定範囲内に接近していると前記検知部が検知した場合、前記受電機は、前記送電機に対して、送電低減信号及び送電停止信号の少なくとも一方を送信する、請求項１から４のいずれか一項に記載の無線送電システム。 When the detection unit detects that the obstacle is approaching within the predetermined range from the power receiver, the power receiver transmits at least one of a power transmission reduction signal and a power transmission stop signal to the power transmitter. The wireless power transmission system according to any one of claims 1 to 4.
  6. 　前記障害物が前記受電機から前記所定範囲外に移動したと前記検知部が検知した場合、前記送電機は、前記受電機へ送電する電力の増加、及び、前記受電機への送電の再開のいずれかを実行する、請求項１から５のいずれか一項に記載の無線送電システム。 When the detection unit detects that the obstacle has moved out of the predetermined range from the power receiver, the power transmitter increases the power transmitted to the power receiver and resumes power transmission to the power receiver. The wireless power transmission system according to any one of claims 1 to 5, wherein any one of them is executed.
  7. 　送電機からの電波を受電する受信部と、
    　前記送電機に信号を送信する送信部と、
    　障害物が自機から所定範囲内に接近しているか検知する検知部と
    を備え、
    　前記障害物が自機から前記所定範囲内に接近していると前記検知部が検知した場合、前記送信部は、前記送電機に所定の信号を送信することによって、自機へ送電する電力の低減、及び、自機への送電の停止のいずれかを前記送電機に実行させる、
    受電機。     A receiver for receiving radio waves from the power transmitter;
    A transmitter for transmitting a signal to the power transmitter;
    A detection unit that detects whether an obstacle is approaching within a predetermined range from the aircraft,
    When the detection unit detects that the obstacle is approaching within the predetermined range from the own device, the transmission unit transmits a predetermined signal to the power transmitter to thereby reduce the power transmitted to the own device. Causing the power transmitter to perform one of reduction and stop of power transmission to the own device,
    Power receiver.
  8. 　受電機に送電するための電波を送信する送信部と、
    　前記受電機からの信号を受信する受信部と
    を備え、
    　障害物が前記受電機から所定範囲内に接近していると前記受電機において検知された場合、前記受電機へ送電する電力の低減、及び、前記受電機への送電の停止のいずれかを実行する、
    送電機。     A transmission unit that transmits radio waves for transmitting power to the power receiver;
    A receiving unit that receives a signal from the power receiver,
    When the receiving device detects that an obstacle is approaching within a predetermined range from the receiving device, the power transmission to the receiving device is reduced or the transmission to the receiving device is stopped. To
    Power transmitter.
  9. 　送電機からの電波を受電する受電機が、障害物が自機から所定範囲内に接近しているか検知し、
    　前記送電機が、前記障害物が前記受電機から前記所定範囲内に接近していると前記受電機において検知された場合、前記受電機へ送電する電力の低減、及び、前記受電機への送電の停止のいずれかを実行する、
    無線送電方法。     The power receiving device that receives the electric wave from the power transmitter detects whether the obstacle is approaching within a predetermined range from its own device,
    When the power transmitter detects that the obstacle is within the predetermined range from the power receiver, the power transmitter reduces power transmitted to the power receiver and transmits power to the power receiver. Perform one of the stops,
    Wireless power transmission method.
  10. 　前記受電機が、前記送電機に対して、送電要求信号を送信し、
    　前記送電機が、前記送電要求信号が到達した方向に向けて、前記電波をビームフォーミングする、請求項９に記載の無線送電方法。     The power receiver transmits a power transmission request signal to the power transmitter,
    The wireless power transmission method according to claim 9, wherein the power transmitter beamforms the radio wave in a direction in which the power transmission request signal has arrived.
  11. 　前記障害物が前記受電機から前記所定範囲内に接近していると検知された場合、前記受電機が、前記送電要求信号の送信を停止する、請求項１０に記載の無線送電方法。 The wireless power transmission method according to claim 10, wherein when the obstacle is detected as approaching within the predetermined range from the power receiving device, the power receiving device stops transmission of the power transmission request signal.
  12. 　前記受電機が、前記送電要求信号の反射に基づき、前記障害物が前記受電機から前記所定範囲内に接近しているか検知する、請求項１０又は１１に記載の無線送電方法。 The wireless power transmission method according to claim 10 or 11, wherein the power receiving device detects whether the obstacle is within the predetermined range from the power receiving device based on reflection of the power transmission request signal.
  13. 　前記障害物が前記受電機から前記所定範囲内に接近していると検知された場合、前記受電機が、前記送電機に対して、送電低減信号及び送電停止信号の少なくとも一方を送信する、請求項９から１２のいずれか一項に記載の無線送電方法。 When it is detected that the obstacle is approaching within the predetermined range from the power receiver, the power receiver transmits at least one of a power transmission reduction signal and a power transmission stop signal to the power transmitter. Item 13. The wireless power transmission method according to any one of Items 9 to 12.
  14. 　前記障害物が前記受電機から前記所定範囲外に移動したと検知された場合、前記送電機が、前記受電機へ送電する電力の増加、及び、前記受電機への送電の再開のいずれかを実行する、請求項９から１３のいずれか一項に記載の無線送電方法。 When it is detected that the obstacle has moved out of the predetermined range from the power receiving device, the power transmitter either increases the power transmitted to the power receiving device or restarts power transmission to the power receiving device. The wireless power transmission method according to any one of claims 9 to 13, which is executed.
PCT/JP2019/004712 2018-02-23 2019-02-08 Wireless power transmission system, power receiver, power transmitter, and wireless power transmission method WO2019163572A1 (en)

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