JP2016103873A - Relay device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently relay power transmitted in a wireless manner from a power transmission unit to a power reception unit, irrespective of the direction of the power reception unit to the power transmission unit, if the power reception unit of a power reception device is in a state of being remote from the power transmission unit of a power transmission device.SOLUTION: A relay device includes: a plurality of repeaters 27a-27d for relaying power, transmitted from a power transmission device 10, to a power reception unit 29; and a holding member 21, configured in a bellows shape to be freely expanded and bent, and having one end in the elastic direction in a bellows shape attached to the power reception unit 29, for holding the repeaters 27a-27d at equal intervals in the elastic direction in a bellows shape.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a relay device that relays power transmitted wirelessly from a power transmission unit of a power transmission device to a power reception unit of the power reception device.

  In recent years, wireless power feeding in which two coils are brought close to each other for power feeding has been put into practical use. In wireless power feeding, a power transmission coil and a power reception coil are brought close to each other, and power transmitted wirelessly from the power transmission coil is received by the power reception coil.

  In such a wireless power feeding technology, two standardizations are in progress: an electromagnetic induction method and a magnetic field resonance method. Currently, Qi (Qi) of the WPC standard, which is most commercialized, is based on an electromagnetic induction method, and feeds power by placing a power transmission coil and a power reception coil close to each other on a one-to-one basis. This method has been used for charging electric toothbrushes and electric shavers.

  However, when it is necessary to bring the power transmission coil and the power reception coil close to each other in order to perform power feeding, the power transmitted from one power transmission device having the power transmission coil is converted into a plurality of power reception coils. The power receiving device cannot receive power.

  Here, in a charging system that receives power transmitted wirelessly from a power transmission coil by a power reception coil, a relay coil that relays power transmitted from the power transmission coil to the power reception coil is connected to the power transmission coil and the power reception coil. A technology that is movably installed in an intermediate region with a coil for power transmission, so that power can be supplied from the power transmission coil to the power reception coil even when the power transmission coil and the power reception coil are separated from each other. Patent Document 1 discloses this.

JP 2011-160505 A

  According to the technique disclosed in Patent Document 1, even when the power transmission coil and the power reception coil are separated from each other, power is transmitted to the power reception coil by relaying the power transmitted from the power transmission coil by the relay coil. Although it can be performed, the power transmitted from one power transmission device cannot be received by a plurality of power reception devices. In particular, when a plurality of power receiving devices are respectively installed in a predetermined direction and the directions are different from each other, the direction with respect to the power transmitting device can efficiently receive power among the plurality of power receiving devices. There is a problem that there is a direction that cannot be performed, and it is difficult to supply power from the power transmission device to the plurality of power reception devices. This problem is not limited to the case where the power transmitted from one power transmission device is received by a plurality of power reception devices, but when the installation directions of the power transmission device and the power reception device are determined respectively. Depending on the orientation of the power coil, the power transmitted from the power transmission coil cannot be efficiently received by the power reception coil.

  The present invention has been made in view of the problems of the prior art as described above, and the direction of the power receiving unit with respect to the power transmitting unit even when the power receiving unit of the power receiving device is separated from the power transmitting unit of the power transmitting device. It is an object of the present invention to provide a relay device that can efficiently relay power transmitted wirelessly from a power transmission unit to a power reception unit.

In order to achieve the above object, the present invention provides:
A relay device that relays power transmitted wirelessly from a power transmission unit of a power transmission device to a power reception unit of a power reception device,
A plurality of relay devices for relaying power transmitted from the power transmission unit to the power reception unit;
The bellows is configured to expand and contract and / or bend freely, one end in the direction of expanding and contracting to the bellows is attached to the power transmission unit or the power receiving unit, and the plurality of relay devices are substantially equal to the direction of expansion and contraction to the bellows And a holding member for holding at intervals.

  In the present invention configured as described above, the power transmitted wirelessly from the power transmission unit of the power transmission device is relayed by the relay device and received by the power reception unit of the power reception device. One end is attached to the power receiving portion or the power receiving portion, and a plurality of holding members that can be expanded and / or bent like a bellows are held at substantially equal intervals in the direction of expanding and contracting like a bellows. Even if the power receiving unit of the power receiving device is separated from the power transmitting unit of the power transmitting device by extending the holding member according to the interval and curving the holding member according to the direction of the power receiving unit with respect to the power transmitting unit, Regardless of the direction of the power receiving unit, the power transmitted wirelessly from the power transmitting unit can be efficiently relayed to the power receiving unit.

  In addition, if measuring means for measuring the magnitude of the electric power transmitted from the power transmission part is attached to a plurality of locations on the opposite side of the holding member from the power receiving part, the measurement result in the measuring means Accordingly, the relative position of the end portion of the holding member with respect to the power transmission unit can be adjusted so that the power transmitted from the power transmission unit can be efficiently relayed to the power reception unit.

  According to the present invention, a plurality of relay devices that relay power transmitted wirelessly from a power transmission unit to a power reception unit are attached to one end of the power transmission unit or the power reception unit, and can be stretched and / or bent in a bellows shape. Since the member is held at substantially equal intervals in the direction of expanding and contracting in a bellows shape, the holding member is extended according to the interval between the power receiving unit and the power transmitting unit, and the holding member according to the direction of the power receiving unit relative to the power transmitting unit By curving the power, the power received by the power transmitter can be efficiently transmitted to the power receiver regardless of the direction of the power receiver relative to the power transmitter even when the power receiver of the power receiver is separated from the power transmitter of the power transmitter. Can be relayed.

  In addition, in the case where measuring means for measuring the magnitude of the electric power transmitted from the power transmission part is attached to a plurality of locations on the opposite side of the power receiving part of the holding member, measurement by the measuring means Depending on the result, the relative position of the holding member with respect to the power transmission unit can be adjusted so that the power transmitted from the power transmission unit can be efficiently relayed to the power reception unit.

It is a figure which shows one Embodiment of the relay apparatus of this invention, (a) is a figure which shows the whole structure for performing wireless electric power feeding using a relay apparatus, (b) is a holding member shown to (a) FIG. 3C is a block diagram illustrating a configuration of the power receiving device illustrated in FIG. 2A and 2B are diagrams for explaining the operation of the power receiving device shown in FIG. 1, in which FIG. 1A is a diagram for explaining the operation of the power receiving device without using a repeater, and FIG. It is a figure for demonstrating operation | movement of an apparatus. It is a figure which shows an example of the usage method of the power receiving apparatus shown in FIG. It is a figure which shows the other example of the usage method of the power receiving apparatus shown in FIG. It is a figure which shows the relative position of the holding member shown in FIG. 1, and the coil for power transmission. It is a figure which shows the shift | offset | difference state of the holding member shown in FIG. 1, and the coil for power transmission.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram illustrating an embodiment of a relay device according to the present invention. FIG. 1A is a diagram illustrating an entire configuration for performing wireless power feeding using the relay device, and FIG. The figure which shows the structure inside the holding member 21 shown, (c) is a block diagram which shows the structure of the power receiving apparatus 20 shown to (a).

  As shown in FIG. 1, the present embodiment relays electric power transmitted wirelessly from the power transmitting apparatus 10 to the power receiving apparatus 20, and uses a magnetic resonance method.

  The power transmission device 10 includes a power source 12 and a power transmission coil 11 that generates a magnetic field when a current flows through the power source 12, and wirelessly transmits power by generating a magnetic field in the power transmission coil 11. is there.

  The power receiving device 20 includes a power receiving unit 29, four repeaters 27 a to 27 d and detection coils 28 a to 28 d, a holding member 21, and an auxiliary device 30, and the relay device of this embodiment is the power receiving device. 20 is obtained by removing the power receiving unit 29. That is, the relay device of this embodiment is configured to be attached to the power receiving unit 29.

  The power receiving unit 29 includes a power receiving coil 24, a resonance capacitor 25, and a load 26. By forming an LC resonance circuit with the power receiving coil 24 and the resonance capacitor 25, the power transmission coil 11 is provided. And the magnetic field generated in the relay coils 22a to 22d, thereby receiving the power transmitted wirelessly from the power transmission coil 11.

  The repeaters 27a to 27d serve as relay devices in the present invention. Each of the repeaters 27a to 27d includes relay coils 22a to 22d and resonance capacitors 23a to 23d, and the relay coils 22a to 22d and the resonance capacitors 23a to 23d form an LC resonance circuit. Thus, a current flows in the relay coils 22a to 22d in resonance with the magnetic field generated in the power transmission coil 11, and a magnetic field is generated by this current. Each of the repeaters 27a to 27d resonates with the magnetic field generated in the relay coils 22a to 22d of the other repeaters 27a to 27d, and a current flows through the relay coils 22a to 22d, and the current also generates a magnetic field. Therefore, the power transmitted wirelessly from the power transmission coil 11 is relayed to the power receiving unit 29.

  The holding member 21 is made of resin or the like, and is configured to be able to expand and contract in a bellows shape. One end of the holding member 21 in the direction of the bellows shape is attached to the power receiving unit 29, and the repeaters 27 a to 27 d are connected to the bellows in the inside. Are held at equal intervals in the direction of stretching.

  The detection coils 28a to 28d serve as measurement means in the present invention, and are attached to different portions of the holding member 21 at the end opposite to the power receiving unit 29. In the present embodiment, the detection coils 28a to 28d are attached to a region opposite to the circumference of the relay coil 22a by 90 degrees at the end of the holding member 21 opposite to the power receiving unit 29. Yes. The detection coils 28 a to 28 d are for detecting the strength of the magnetic field in the attached region, but the power of the magnetic field generated in the power transmission coil 11 is transmitted from the power transmission coil 11 wirelessly. Therefore, the detection coils 28 a to 28 d are for measuring the magnitude of the electric power transmitted from the power transmission coil 11.

  The auxiliary device 30 includes a received power measurement unit 31, a received power storage unit 32, a received power comparison unit 33, a received power output unit 34, a magnetic field strength comparison unit 36, a shift state output unit 37, and a display unit 35. , 38.

  The received power measuring unit 31 measures the power received by the power receiving unit 29.

  The received power storage unit 32 stores the received power measured by the received power measurement unit 31.

  The received power comparison unit 33 compares the received power measured by the received power measurement unit 31 with the received power stored in the received power storage unit 32.

  Based on the comparison result in the received power comparison unit 33, the power reception state output unit 34 stores information indicating the current power reception state based on the relative position between the end of the holding member 21 opposite to the power reception unit 29 and the power transmission device 10. The display unit 35 outputs the display.

  The magnetic field strength comparison unit 36 compares the strength of the magnetic field detected by the detection coils 28a to 28d.

  Based on the comparison result in the magnetic field strength comparison unit 36, the deviation state output unit 37 displays information indicating the deviation of the end of the holding member 21 opposite to the power reception unit 29 with respect to the power transmission coil 11 on the display unit 38. Output.

  Below, operation | movement of the power receiving apparatus 20 comprised as mentioned above is demonstrated.

  First, the operation principle of the power receiving device 20 will be described.

  2 is a diagram for explaining the operation of the power receiving device 20 shown in FIG. 1. FIG. 2 (a) is a diagram for explaining the operation of the power receiving device 20 when the repeaters 27a to 27d are not interposed. ) Is a diagram for explaining the operation of the power receiving device 20 through the repeaters 27a to 27d.

  When the power transmission device 10 and the power reception unit 29 are close to each other, as illustrated in FIG. 2A, if a magnetic field is generated by a current flowing through the power supply 12 in the power transmission coil 11 of the power transmission device 10, In the power receiving coil 24 of the unit 29, a current flows in resonance with the magnetic field, and an electromotive force is generated. As a result, the power transmitted wirelessly from the power transmission device 10 is received by the power receiving unit 29. As described above, when the power transmission device 10 and the power receiving unit 29 are close to each other, the power transmitted from the power transmission device 10 wirelessly can be received by the power receiving unit 29 without using the repeaters 27a to 27d. .

  However, when the power transmission device 10 and the power reception unit 29 are separated, the magnetic field generated in the power transmission coil 11 does not reach the power reception coil 24 or the strength of the magnetic field that reaches the power reception coil 24 is considerably weak. Thus, no current due to the magnetic field flows through the power receiving coil 24.

  Therefore, as illustrated in FIG. 1, repeaters 27 a to 27 d are arranged between the power transmission device 10 and the power reception unit 29. Then, as shown in FIG. 2B, when a magnetic field is generated due to a current flowing in the power transmission coil 11 of the power transmission device 10 by the power source 12, first, the repeater 27 a close to the power transmission device 10 is used for relaying. The coil 22a resonates with this magnetic field and a current flows to generate a magnetic field. Then, a current flows in resonance with the magnetic field in the relay coil 22b of the repeater 27b adjacent to the repeater 27a to generate a magnetic field. Similarly, when a magnetic field is generated in the relay coil 22b of the repeater 27b, a current flows in resonance with the magnetic field in the relay coil 22c of the repeater 27c adjacent to the repeater 27b to generate a magnetic field. When a magnetic field is generated in the relay coil 22c of the repeater 27c, a current flows in resonance with the magnetic field in the relay coil 22d of the repeater 27d adjacent to the repeater 27c to generate a magnetic field. When a magnetic field is generated in the relay coil 22d of the repeater 27d, a current flows in resonance with the magnetic field in the power receiving coil 24 of the power receiving unit 29 to generate an electromotive force. Thereby, the electric power transmitted wirelessly from the power transmission device 10 is received by the power receiving unit 29 via the repeaters 27a to 27d. As described above, when the power transmission device 10 and the power reception unit 29 are separated from each other, the power transmitted wirelessly from the power transmission device 10 can be received by the power reception unit 29 via the repeaters 27a to 27d.

  In order to realize such an operation, the repeaters 27a to 27d are connected to the relay coils 22b to 22d adjacent to the relay coils 22a to 22d by the magnetic field generated in the relay coils 22a to 22d as described above. The power receiving coil 24 is attached to the holding member 21 at an interval at which the power receiving coil 24 can resonate.

  Next, an actual usage method of the above-described power receiving device 20 will be described.

  FIG. 3 is a diagram illustrating an example of a method of using the power receiving device 20 illustrated in FIG.

  As shown in FIG. 3A, the power transmission device 10 and the notebook computer 40 for performing wireless power feeding by the power transmission device 10 are installed apart from each other, and the power receiving coil 24 provided in the notebook computer 40 is provided. When the direction does not face the power transmission coil 11 of the power transmission device 10, the holding member 21 is extended and curved, and as shown in FIG. 3B, the holding member 21 is opposite to the power receiving coil 24. The relay coil 22 a attached to the end of the power transmission device 10 faces the power transmission coil 11 of the power transmission device 10.

  Then, as described above, the power transmitted wirelessly from the power transmission device 10 is received by the power receiving coil 24 of the power receiving unit 29 via the relay coils 22a to 22d of the repeaters 27a to 27d. At this time, the repeaters 27a to 27d are held at equal intervals in the holding member 21 so as to expand and contract like a bellows, so that the power is stably relayed between the relay coils 22a to 22d. Thus, the power receiving unit 29 can receive power efficiently. Further, even when the directions of the power receiving coil 24 and the power transmission coil 11 are greatly different, the directions of the relay coils 22a to 22d are not greatly different, and thus the wireless transmission is performed from the power transmission device 10. The power receiving unit 29 can efficiently receive the power without relaying the received power. Note that the above-described effects can be obtained if the intervals at which the repeaters 27a to 27d are held inside the holding member 21 are not strictly equal intervals but are approximately equal intervals.

  FIG. 4 is a diagram illustrating another example of how to use the power receiving device 20 illustrated in FIG. 1.

  As shown in FIG. 4A, when wireless power feeding is performed using one power transmission device 10 to three notebook personal computers 40a to 40c installed in different directions, they are attached to the notebook personal computers 40a to 40c. Each of the holding members 21 is extended, and the holding member 21 attached to the notebook personal computers 40a and 40c whose direction of the power receiving coil 24 is not opposed to the power transmitting coil 11 of the power transmission device 10 is curved, as shown in FIG. As shown in FIG. 2, for each of the holding members 21 attached to the notebook computers 40 a to 40 c, the relay coil 22 a attached to the end opposite to the power receiving coil 24 is connected to the power transmission coil 11 of the power transmission device 10. Try to face each other.

  By doing in this way, the electric power transmitted wirelessly from the power transmission apparatus 10 is relayed by the relay coils 22a to 22d in the holding member 21 attached to the notebook personal computers 40a to 40c. Power is received by the power receiving coil 24 of 40c.

  As described above, even when there are a plurality of power receiving devices that receive power transmitted wirelessly from the power transmitting device 10 and the directions of the power receiving units of the plurality of power receiving devices are different from each other, the single power transmitting device 10 performs wireless communication. Power can be supplied.

  Next, the operation of the auxiliary device 30 will be described.

  As described above, when the power transmission device 10 performs wireless power feeding to the power reception device 20, the end of the holding member 21 opposite to the power reception unit 29 is opposed to the power transmission coil 11. Recognizing whether the relative position between the end opposite to the power receiving unit 29 and the power transmission coil 11 is the power receiving unit 20 that can receive the power transmitted from the power transmitting device 10 most efficiently. May not be easy.

  FIG. 5 is a diagram illustrating a relative position between the holding member 21 and the power transmission coil 11 illustrated in FIG. 1.

  When the relative position between the end of the holding member 21 opposite to the power receiving portion 29 and the power transmission coil 11 is based on that shown in FIG. 5A, as shown in FIG. When the end portion of the member 21 opposite to the power receiving portion 29 is separated from the power transmission coil 11, or as shown in FIG. 5C, the end portion of the holding member 21 opposite to the power receiving portion 29. And the power transmission coil 11 may be misaligned. In these cases, the power received by the power receiving unit 29 is such that the relative position between the end of the holding member 21 opposite to the power receiving unit 29 and the power transmission coil 11 is as shown in FIG. Smaller than that.

  First, in the auxiliary device 30, the power received by the power receiving unit 29 is measured by the received power measuring unit 31, and the measured power is stored in the received power storage unit 32.

  Then, the received power measured by the received power measuring unit 31 and the received power stored in the received power storage unit 32 are compared by the received power comparing unit 33 and measured by the received power measuring unit 31. When the received power is larger than the received power stored in the received power storage unit 32, the power reception state output unit 34 displays information indicating that fact on the display unit 35. When the LED is used as the display unit 35, the power reception state output unit 34 is used when the received power measured by the received power measurement unit 31 is larger than the received power stored in the received power storage unit 32. The LED is turned on.

  In this way, when the power currently received by the power receiving unit 29 is larger than the power received by the power receiving unit 29 so far, information indicating that fact is displayed on the display unit 35. The display unit 35 receives power of the holding member 21 so that information indicating that the power currently received by the power receiving unit 29 is larger than the power received by the power receiving unit 29 is displayed. The end of the holding member 21 opposite to the power receiving unit 29 and the relative position between the end of the holding member 21 opposite to the power receiving unit 29 and the power transmission coil 11 are moved to receive the power transmitted from the power transmitting device 10. 20 so that power can be received most efficiently.

  The received power stored in the received power storage unit 32 may be updated in real time or at regular intervals, or the received power measured during the previous wireless power feeding may be stored. Further, the output means for outputting the power receiving state described above is not limited to a visually recognizable device such as the display unit 35, but may be an audibly recognizable device such as a buzzer.

  FIG. 6 is a diagram illustrating a shift state between the holding member 21 and the power transmission coil 11 illustrated in FIG. 1.

  The end of the holding member 21 opposite to the power receiving unit 29 and the power transmission coil 11 shown in FIG. 1 have the power transmitted wirelessly from the power transmission coil 11 opposite to the power receiving unit 29 of the holding member 21. When the relay coil 22a and the power transmission coil 11 are opposed to each other as shown in FIG. 6A, the relay coil 22a is close enough to be relayed by the relay coil 22a attached to the end portion on the side. Not limited to this, as shown in FIGS. 6B and 6C, the relay coil 22a and the power transmission coil 11 may be misaligned.

  Therefore, first, in the auxiliary device 30, the magnetic field strength comparison unit 36 compares the strengths of the magnetic fields detected by the detection coils 28 a to 28 d. As described above, the detection coils 28a to 28d are attached to the region facing the circumference of the relay coil 22a by 90 degrees at the end of the holding member 21 opposite to the power receiving unit 29. Therefore, it is possible to detect the strength of the magnetic field at a location shifted by 90 degrees in the region facing the circumference of the relay coil 22a.

  As shown in FIG. 6A, when the relay coil 22a and the power transmission coil 11 are opposed to each other, the strengths of the magnetic fields detected by the detection coils 28a to 28d are equal to each other.

  6B, when the relay coil 22a is displaced from the power transmission coil 11 by about half of the relay coil 22a, the three detection coils 28a out of the detection coils 28a to 28d. Although the magnetic field is detected at ~ 28c, the strength of the magnetic field detected by the detection coil 28a is the largest.

  In addition, as shown in FIG. 6C, when the relay coil 22a is deviated to the extent that there is almost no overlap with the power transmission coil 11, the magnetic field is detected only by the detection coil 28b. Become.

  As described above, the strength of the magnetic field detected by the detection coils 28 a to 28 d attached to the end of the holding member 21 opposite to the power receiving unit 29 is opposite to that of the power receiving unit 29 of the holding member 21. In accordance with the deviation between the relay coil 22a attached to the end of the coil and the power transmission coil 11, the deviation state output unit 37 determines the holding member 21 based on the comparison result in the magnetic field strength comparison unit 36. Information indicating a deviation from the power transmission coil 11 at the end opposite to the power receiving unit 29 is displayed and output on the display unit 38. For example, a detection coil having the strongest magnetic field strength or information indicating its mounting position is output using the display unit 38 to recognize a deviation between the relay coil 22a and the power transmission coil 11. The end of the holding member 21 opposite to the power receiving unit 29 is moved so that the relay coil 22a and the power transmitting coil 11 face each other, and the power transmitted from the power transmitting device 10 is transferred to the power receiving unit 20. Can be adjusted so that power can be received efficiently.

  The comparison of the magnetic field strength in the magnetic field strength comparison unit 36 may be performed periodically instead of always. Further, based on the comparison result in the magnetic field strength comparison unit 36, a mechanism for automatically moving the end of the holding member 21 opposite to the power reception unit 29 so that the relay coil 22a and the power transmission coil 11 face each other. May be provided.

  In the present embodiment, four repeaters 27a to 27d are provided in order to relay the power transmitted wirelessly from the power transmission device 10 to the power receiving unit 29. However, the number of repeaters is not limited to four as long as the number of repeaters is plural. . However, as the number of repeaters increases, it becomes easier to handle even when the directions of the power transmission device 10 and the power reception unit 29 are greatly different, such as when the directions of the power transmission device 10 and the power reception unit 29 are reversed. .

  Further, the holding member 21 is not limited to a bellows shape that can be expanded and contracted freely, but can be a bellows shape that can be expanded and contracted freely, or a bellows shape that can be bent only. May be. If the bellows is configured so that it can only be expanded and contracted, the holding member 21 is expanded and contracted according to the distance between the end of the holding member 21 opposite to the power receiving unit 29 and the power transmission coil 11, thereby transmitting power. The power transmitted from the device 10 can be received efficiently by the power receiving unit 20. Further, if the bellows is configured to be bent only freely, the holding member 21 is bent when the end of the holding member 21 opposite to the power receiving portion 29 and the power transmission coil 11 are misaligned. Therefore, the power transmitted from the power transmission device 10 can be efficiently received by the power receiving unit 20.

  Further, the number of detection coils is not limited to four as long as it is plural, but the four detection coils 28a to 28d shown in the present embodiment are mounted at equal intervals so as to be shifted by 90 degrees. It is preferable that

  Moreover, in embodiment mentioned above, the relay apparatus which consists of the four repeaters 27a-27d and the coils 28a-28d for detection, the holding member 21, and the auxiliary | assistant apparatus 30 is attached to the power receiving part 29 as an example. As described above, the relay device of the present invention uses the power transmission coil 11 as a power transmission unit, and uses the power transmission coil 11 in the same manner as described above as a form in which one end of the holding member 21 is attached to the power transmission coil 11. The power transmitted from 11 can be efficiently relayed by the power receiving coil 24.

DESCRIPTION OF SYMBOLS 10 Power transmission device 11 Power transmission coil 12 Power supply 20 Power receiving device 21 Holding member 22a-22d Relay coil 23a-23d, 25 Resonance capacitor 26 Load 24 Power reception coil 27a-27d Repeater 28a-28d Detection coil 29 Power reception part 30 Auxiliary Device 31 Received power measurement unit 32 Received power storage unit 33 Received power comparison unit 34 Received state output unit 35, 38 Display unit 36 Magnetic field strength comparison unit 37 Deviation state output unit 40, 40a to 40c

Claims (2)

A relay device that relays power transmitted wirelessly from a power transmission unit of a power transmission device to a power reception unit of a power reception device,
A plurality of relay devices for relaying power transmitted from the power transmission unit to the power reception unit;
The bellows is configured to expand and contract and / or bend freely, one end in the direction of expanding and contracting to the bellows is attached to the power transmission unit or the power receiving unit, and the plurality of relay devices are substantially equal to the direction of expansion and contraction to the bellows A relay device having a holding member held at an interval. The relay device according to claim 1,
The holding member has a relay device in which measuring means for measuring the magnitude of the electric power transmitted from the power transmission unit is attached to a plurality of locations at the other end when the one end is attached to the power receiving unit. .

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