JP2015002310A - Non-contact power transmission system, power receiver and retainer - Google Patents

Abstract

An object of the present invention is to reduce a decrease in power transmitted from a power transmission device to a plurality of power reception devices. A non-contact power transmission system includes a power transmission device that generates an alternating magnetic field, a first power receiving device that includes a first power receiving coil in which the magnetic flux of the alternating magnetic field is linked, and a magnetic flux of the alternating magnetic field that is linked. A second power receiving device 12 including the second power receiving coil and arranged in parallel with the first power receiving device 11, and an intermediate magnetic portion 21 having a magnetic material disposed between the first power receiving coil and the second power receiving coil. Including a magnetic part. [Selection] Figure 1

Description

  The present invention relates to a contactless power transmission system that transmits power in a contactless manner and a power receiving device and a holding device used in the contactless power transmission system.

  2. Description of the Related Art Conventionally, there is known a non-contact power transmission system that transmits electric power from a power transmission coil to a power receiving coil in a non-contact manner by interlinking magnetic flux generated in the power transmission coil by electromagnetic induction to the power receiving coil. Conventional non-contact power transmission systems are mainly applied to devices that charge or feed power in electric vehicles or residential facilities, including small electric devices.

  In recent years, a magnetic field resonance type non-contact power transmission system using electromagnetic resonance has attracted attention. In the magnetic resonance type non-contact power transmission system, the resonance circuit is provided in each of the power transmission coil and the power reception coil, and the power transmission distance can be extended as compared with the electromagnetic induction system.

  In such a non-contact power transmission system, a system that transmits power from one power transmission device to a plurality of power reception devices is known (see, for example, Patent Document 1). Patent Document 1 discloses a technique for performing power transmission control by performing communication between a power transmission device and a power reception device and controlling an oscillation frequency of the power transmission device.

JP 2012-205411 A

  However, in the conventional system described in Patent Document 1, the mutual influence between the plurality of power receiving apparatuses is not taken into consideration, and it is considered that the magnetic flux interferes between the plurality of power receiving apparatuses. As a result, the power transmitted from the power transmission device to the plurality of power reception devices is greatly reduced.

  The present invention solves the above-described conventional problems, and is used in a non-contact power transmission system capable of reducing a reduction range of power transmitted from a power transmission device to a plurality of power reception devices, and the non-contact power transmission system. An object is to provide a power receiving device and a holding device.

  A contactless power transmission system according to one aspect of the present invention includes a power transmission device that generates an alternating magnetic field, a first power receiving device that includes a first power receiving coil that links the magnetic flux of the alternating magnetic field, and a magnetic flux of the alternating magnetic field. A second power receiving device that includes a second power receiving coil that is linked to the first power receiving device, and an intermediate that includes a magnetic material disposed between the first power receiving coil and the second power receiving coil. And a magnetic part including a magnetic part.

  According to this configuration, the magnetic flux of the alternating magnetic field generated in the power transmission device passes through the intermediate magnetic part disposed between the first power receiving coil and the second power receiving coil as a magnetic path. Therefore, canceling out magnetic flux between the first power receiving coil and the second power receiving coil is reduced, and the influence of interference between the first power receiving coil and the second power receiving coil is reduced. For this reason, it becomes possible to reduce the fall width of the electric power transmitted from the power transmission device to the first power receiving device and the second power receiving device.

  In the non-contact power transmission system, the magnetic part includes a first magnetic part having a magnetic material disposed adjacent to the first power receiving coil, and a magnetic material disposed adjacent to the second power receiving coil. A second magnetic part, wherein the first power receiving coil is disposed between the first magnetic part and the intermediate magnetic part, and the second power receiving coil includes the second magnetic part and the second magnetic part. It may be arranged between the intermediate magnetic part.

  According to this configuration, the magnetic flux of the alternating magnetic field generated in the power transmission device includes the first magnetic unit disposed adjacent to the first power receiving coil, and the second magnetic unit disposed adjacent to the second power receiving coil. Through as a magnetic path. The first power receiving coil is disposed between the first magnetic part and the intermediate magnetic part, and the second power receiving coil is disposed between the second magnetic part and the intermediate magnetic part. Therefore, since the magnetic path around the first power receiving coil is similar to the magnetic path around the second power receiving coil, the flow of magnetic flux is also similar. For this reason, it becomes possible to suppress an increase in the difference between the transmission power from the power transmission device to the first power reception device and the transmission power from the power transmission device to the second power reception device.

  In the above non-contact power transmission system, the intermediate magnetic unit is arranged so that a distance between the first power receiving coil and the intermediate magnetic unit is equal to a distance between the second power receiving coil and the intermediate magnetic unit. It may be.

  According to this configuration, the magnetic path formed by the intermediate magnetic unit around the first power receiving coil is the same as the magnetic path formed by the intermediate magnetic unit around the second power receiving coil, so that the flow of magnetic flux Is the same. For this reason, it becomes possible to reduce the difference between the transmission power from the power transmission device to the first power reception device and the transmission power from the power transmission device to the second power reception device.

  In the non-contact power transmission system, the intermediate magnetic unit may be a single magnetic body arranged at an intermediate point between the first power receiving coil and the second power receiving coil.

  According to this configuration, the magnetic flux of the alternating magnetic field generated by the power transmission device passes through one magnetic body disposed at an intermediate point between the first power receiving coil and the second power receiving coil as a magnetic path. Therefore, it is possible to reduce the amount of decrease in the power transmitted from the power transmission device to the first power reception device and the second power reception device in a state where the number of magnetic bodies is minimized.

  In the above non-contact power transmission system, even if the length of the intermediate magnetic part in the vertical direction is longer than the length of the first power receiving coil in the vertical direction and longer than the length of the second power receiving coil in the vertical direction. Good.

  According to this configuration, the magnetic path formed by the intermediate magnetic part extends in the vertical direction from the first power receiving coil and the second power receiving coil. Accordingly, it is possible to avoid canceling out magnetic flux between the first power receiving coil and the second power receiving coil due to the wraparound of the magnetic flux from the vertical direction. For this reason, it becomes possible to further reduce the reduction width of the power transmitted from the power transmission device to the first power reception device and the second power reception device.

  In the above non-contact power transmission system, the intermediate magnetic part may be provided so as to extend in both directions of the front surface side and the rear surface side of the flux linkage surface of the first power receiving coil and the second power receiving coil. Good.

  According to this configuration, between the first power receiving coil and the second power receiving coil, the magnetic flux generated by the wraparound of the magnetic flux on both the front surface side and the back surface side of the magnetic flux linkage surface of the first power receiving coil and the second power receiving coil. The cancellation can be reduced. For this reason, the fall width of the electric power transmitted from the power transmission device to the first power reception device and the second power reception device can be further reduced.

  In the non-contact power transmission system, the length of the intermediate magnetic part in the direction perpendicular to the magnetic flux linkage surface of the first power receiving coil is a direction in which the first power receiving coil and the second power receiving coil are aligned. The first power receiving coil may be longer than the first power receiving coil and the second power receiving coil.

  According to this configuration, the canceling of the magnetic flux between the first power receiving coil and the second power receiving coil due to the wraparound of the magnetic flux interlinked with the first power receiving coil and the magnetic flux interlinked with the second power receiving coil can be performed in a wider range. Can be suppressed. For this reason, it is possible to further reduce the reduction width of the power transmitted from the power transmission device to the first power reception device and the second power reception device.

  In the non-contact power transmission system, the power transmission device includes a power transmission resonance circuit having a power transmission coil and a power transmission capacitor connected to the power transmission coil, and the first power reception device is connected to the first power reception coil. A first capacitor constituting a first resonance circuit together with the first power receiving coil, a first device coil magnetically coupled to the first power receiving coil, and electrically connected to the first device coil, A first load that receives supply of electric power induced in the first device coil, and the second power receiving device is connected to the second power receiving coil and forms a second resonance circuit together with the second power receiving coil. A second capacitor, a second device coil magnetically coupled to the second power receiving coil, an electrical connection electrically connected to the second device coil, and a power induced in the second device coil. And the second resonance circuit is not electrically connected to the first device coil and the first load, and the second resonance circuit is connected to the second device coil. And may not be electrically connected to the second load.

  According to this configuration, since the first resonance circuit is not electrically connected to the first device coil and the first load, it is possible to suppress a decrease in the Q value of the first resonance circuit. Moreover, since the 2nd resonance circuit is not electrically connected with the 2nd apparatus coil and the 2nd load, the fall of Q value of a 2nd resonance circuit can be suppressed. Therefore, the power transmission efficiency from the power transmission device to the first power reception device and the second power reception device can be improved. For this reason, even if the distance between the power transmission device and the first power reception device and the second power reception device is increased, power transmission is possible. As a result, the degree of freedom of the usage mode of the non-contact power transmission system can be improved.

  The non-contact power transmission system may further include a holding device that holds the magnetic part.

  According to this configuration, the magnetic unit is held by the holding device separately from the first power receiving device and the second power receiving device. For this reason, it becomes possible to avoid that the magnitude | size of a 1st power receiving apparatus and a 2nd power receiving apparatus increases with a magnetic part.

  In the non-contact power transmission system, the holding device may further hold the first power receiving device and the second power receiving device.

  According to this structure, since it hold | maintains with a holding | maintenance apparatus, a 1st power receiving apparatus and a 2nd power receiving apparatus can be installed stably. Moreover, the positional relationship between the first power receiving coil and the second power receiving coil and the magnetic part can be fixed by the holding device.

  In the above non-contact power transmission system, the holding device may be configured to hold the magnetic part in a detachable manner.

  According to this configuration, since the magnetic part is detachably held by the holding device, the number of magnetic parts can be reduced if not necessary.

  The contactless power transmission system may further include a first holding device that holds the first power receiving device and a second holding device that holds the second power receiving device, and the first holding device and the second holding device. The apparatus may be configured to be connectable to each other.

  According to this configuration, since the first holding device and the second holding device are configured to be connected to each other, the first power receiving device and the second power receiving device can be installed at a constant interval.

  In the above non-contact power transmission system, the magnetic unit may be incorporated in each of the first power receiving device and the second power receiving device.

  According to this structure, compared with the case where the magnetic part is provided separately from the 1st power receiving apparatus and the 2nd power receiving apparatus, the number of parts which comprise a system can be reduced. For this reason, user convenience is improved.

  A power receiving device according to one aspect of the present invention is a power receiving device used in the above-described contactless power transmission system, and includes a power receiving unit including a power receiving coil in which a magnetic flux of the alternating magnetic field is linked, and adjacent to the power receiving coil. And a magnetic part having a magnetic material arranged.

  According to this configuration, the magnetic flux of the alternating magnetic field generated by the power transmission device passes through the magnetic part disposed adjacent to the power receiving coil as a magnetic path. Therefore, even when power is transmitted from the power transmitting device at the same time as another power receiving device, it is possible to reduce the cancellation of magnetic flux between the power receiving coil and the power receiving coil of the other power receiving device. The influence of interference with the power receiving coil is reduced. For this reason, it becomes possible to reduce the fall of the electric power transmitted from a power transmission apparatus.

  A holding device according to one aspect of the present invention is a holding device used in the above-described contactless power transmission system, and includes a first holding unit that holds the first power receiving device and a second holding device that holds the second power receiving device. 2 holding parts and a third holding part for holding the intermediate magnetic part, wherein the first holding part, the second holding part, and the third holding part are the first power receiving device and the second power receiving part. The intermediate magnetic part is arranged between the first power receiving coil and the second power receiving coil so that the device is arranged in parallel.

  According to this configuration, the magnetic flux of the alternating magnetic field generated in the power transmission device passes through the intermediate magnetic part disposed between the first power receiving coil and the second power receiving coil as a magnetic path. Therefore, canceling out magnetic flux between the first power receiving coil and the second power receiving coil is reduced, and the influence of interference between the first power receiving coil and the second power receiving coil is reduced. For this reason, it becomes possible to reduce the fall width of the electric power transmitted from the power transmission device to the first power receiving device and the second power receiving device.

  ADVANTAGE OF THE INVENTION According to this invention, the fall width of the electric power transmitted from a power transmission apparatus to a 1st power receiving apparatus and a 2nd power receiving apparatus can be reduced.

1 is a perspective view schematically showing an external appearance of a contactless power transmission system according to a first embodiment. The perspective view which shows the structure of the electric equipment and holding | maintenance apparatus of the non-contact electric power transmission system of 1st Embodiment. The figure which shows schematically the electric circuit of the non-contact electric power transmission system of 1st Embodiment. Sectional drawing seen from the top which shows the positional relationship of the power transmission coil of the non-contact electric power transmission system of 1st Embodiment, a receiving coil, and a magnetic body. Sectional drawing seen from the top which shows the flow of the magnetic flux in the non-contact electric power transmission system of 1st Embodiment. Sectional drawing seen from the top which shows the flow of the magnetic flux in the conventional non-contact electric power transmission system which is not provided with a magnetic body as a comparative example. Sectional drawing seen from the top which shows the flow of the magnetic flux in the non-contact electric power transmission system of 1st Embodiment when the position of the receiving coil with respect to the power transmission coil has shifted | deviated. Sectional drawing seen from the top which shows the flow of the magnetic flux in the conventional non-contact electric power transmission system which is not provided with the magnetic body when the position of the receiving coil with respect to the power transmission coil has shifted as a comparative example. Sectional drawing seen from the top which shows the flow of the magnetic flux in the non-contact electric power transmission system of 1st Embodiment when only one receiving coil is arrange | positioned. Sectional drawing seen from the top which shows the flow of the magnetic flux in the non-contact electric power transmission system of 1st Embodiment when only one magnetic body is arrange | positioned between receiving coils. The perspective view which shows schematically the structure of the non-contact electric power transmission system of the 2nd Embodiment of this invention. Sectional drawing seen from the side which shows the power transmission coil provided in the power transmission apparatus of 2nd Embodiment. Sectional drawing seen from the side which shows the lower end part of the main-body part of the electric equipment of 2nd Embodiment. Sectional drawing seen from the side which shows the flow of the magnetic flux in the non-contact electric power transmission system of 2nd Embodiment. The perspective view which shows the example of a different shape of a magnetic body. The perspective view which shows roughly the external appearance of the power transmission apparatus and electric equipment which are used for the non-contact electric power transmission system of the 3rd Embodiment of this invention. The figure which shows schematically the receiving coil and apparatus coil which are used for the non-contact electric power transmission system of 3rd Embodiment. The figure which shows schematically the electric circuit of the non-contact electric power transmission system of 3rd Embodiment.

  Embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(First embodiment)
FIG. 1 is a perspective view schematically showing an external appearance of a contactless power transmission system according to a first embodiment. FIG. 2 is a perspective view illustrating the configuration of the electrical device and the holding device of the non-contact power transmission system according to the first embodiment. FIG. 3 is a diagram schematically illustrating an electric circuit of the contactless power transmission system according to the first embodiment. FIG. 4 is a cross-sectional view seen from above showing the positional relationship between the power transmission coil, the power reception coil, and the magnetic body of the contactless power transmission system of the first embodiment.

  As shown in FIG. 1, the non-contact power transmission system 1 of the first embodiment includes a power transmission device 10, electric devices 11 and 12, magnetic bodies 21 to 23, and holding devices 31 and 32.

  In FIG. 3, the power transmission device 10 includes an AC-DC converter 15 that converts AC power input from a commercial AC power source PS (not shown) into DC power, a power transmission coil L1, a power transmission capacitor C1, and an AC-DC converter 15. Switching elements S1 to S4 for turning on / off the DC power output from the control unit 16, a control unit 16 for controlling on / off of the switching elements S1 to S4, and gate resistors R1 to R4. Field effect transistors (FETs) are used as the switching elements S1 to S4.

  The gates of the switching elements S1 to S4 are connected to the control unit 16 via gate resistors R1 to R4, respectively.

  The power transmission capacitor C1 is connected in series with the power transmission coil L1. The power transmission coil L1 and the power transmission capacitor C1 constitute a power transmission resonance circuit LC1. The power transmission resonance circuit LC1 is connected in series between the switching element S1 and the switching element S4, and is connected in series between the switching element S3 and the switching element S2.

  The controller 16 alternately turns on the switching elements S1 and S4 and turns off the switching elements S2 and S3, and turns off the switching elements S1 and S4 and turns on the switching elements S2 and S3. As a result, the DC power from the AC-DC converter 15 is alternately inverted and flows to the power transmission resonance circuit LC1. As a result, an alternating current flows through the power transmission coil L1, and an alternating magnetic field is generated. For convenience of illustration, the control unit 16 is illustrated in four places, but actually, one control unit 16 is provided.

  The electrical device 11 includes a power receiving coil L11 that receives magnetic flux generated by the power transmitting coil L1, a power receiving capacitor C11 connected in parallel with the power receiving coil L11, a rectifier circuit BD1 that converts AC power of the power receiving coil L11 into DC power, A smoothing capacitor C31 that smoothes the DC power of the rectifier circuit BD1 and a load LD1 are provided.

  A power receiving resonance circuit LC11 is configured by the power receiving coil L11 and the power receiving capacitor C11. As the rectifier circuit BD1, a bridge-type full-wave rectifier circuit composed of four diodes is used. In this embodiment, the load LD1 is a secondary battery, for example, and is charged by DC power smoothed by the smoothing capacitor C31.

  The electric device 12 includes a power receiving coil L12, a power receiving capacitor C12, a rectifier circuit BD2, a smoothing capacitor C32, and a load LD2. As illustrated in FIG. 3, the power transmission device 10 and the electrical device 11 are not electrically connected, and the power transmission device 10 and the electrical device 12 are not electrically connected. Since the electrical device 12 is configured in exactly the same way as the electrical device 11, a detailed description of the electrical device 12 is omitted.

  In FIG. 1, the power transmission coil L1 is a rectangular planar coil formed by, for example, winding a copper wire in a spiral shape. The power transmission coil L1 is disposed near the surface of the casing of the power transmission device 10. As shown in FIG. 4, the power transmission coil L1 is formed so that the thickness D2 of the coil layer is sufficiently smaller than the inner dimension D1 of the magnetic flux surface. Also, as shown in FIG. 4, a magnetic body 17 made of a ferrite material is provided on the opposite side of the surface facing the power receiving coils L <b> 11 and L <b> 12, that is, the inner side of the power transmission device 10.

  An outlet plug (not shown) protrudes from the casing of the power transmission device 10 on the opposite side of the power transmission coil L1. The cordless power transmission device 10 is realized by inserting the outlet plug into the outlet together with the casing of the power transmission device 10. In addition, you may make it the power transmission apparatus 10 have an outlet plug with a cord. In this case, the freedom degree of arrangement | positioning of the power transmission apparatus 10 can be increased.

  The electric devices 11 and 12 are electric toothbrushes in the first embodiment. The electric devices 11 and 12 include a brush portion 41 and a main body portion 42 as in the case of a conventional electric toothbrush. The main body 42 includes a toothbrush operation circuit (not shown). The main body 42 further includes a substrate (not shown) provided with a power receiving resonance circuit LC11 including a power receiving coil L11 and a power receiving capacitor C11, a power switch 43, a display LED 44, a rectifier circuit BD1, and a smoothing capacitor C31. Have.

  The power receiving coil L11 is provided at the center on the back side of the lower half of the main body 42. The power receiving coil L11 is a rectangular planar coil formed by, for example, winding a copper wire in a spiral shape. As shown in FIG. 4, the length (thickness) D3 of the layer of the receiving coil L11 is sufficiently smaller than the lateral width D4 of the receiving coil L11. As a result, the power receiving coil L <b> 11 can be built in the electric toothbrush that is the electric device 11. The power receiving coils L11 and L12 have the same shape and size. The electric device 12 is configured in exactly the same way as the electric device 11.

  The magnetic bodies 21, 22, and 23 are rectangular magnetic sheets formed of a ferrite material, and have the same shape and size. As shown in FIG. 2, the length D6 of the magnetic body 21 in the vertical direction is longer than the length D5 of the power receiving coil L11 in the vertical direction. Further, as shown in FIG. 4, the magnetic body 21 extends in both directions on the front surface side (that is, the power transmission coil L1 side) and the rear surface side (that is, the opposite side of the power transmission coil L1) of the magnetic flux linkage surface of the power receiving coil L11. It is provided to extend. As shown in FIG. 4, the length D7 of the magnetic body 21 in the horizontal direction is longer than the lateral width D4 of the power receiving coil L11.

  The holding device 31 holds the magnetic bodies 21 and 22 and the electric device 11. The holding device 31 includes magnetic body holding portions 33 and 34, a device holding portion 35, and a connecting portion 36. The magnetic body holding portions 33 and 34 are provided at the right end and the left end of the holding device 31, respectively. The magnetic body holding portions 33 and 34 have a clip type structure. The magnetic body holding portions 33 and 34 are configured to detachably hold the inserted magnetic bodies 21 and 22, respectively.

  The device holding part 35 is formed as a cylindrical recess. The device holding unit 35 holds the inserted electric device 11 (electric toothbrush). The concave portion of the device holding portion 35 is formed in an oval shape in plan view, and the direction of the electric device 11 to be held can be fixed. The connecting portion 36 is for connecting the holding device 31 and the holding device 32 together.

  The holding device 32 has the same structure as the holding device 31 except that the holding device 32 does not have a configuration corresponding to the magnetic body holding portion 34 of the holding device 31. As shown in FIG. 1, the electric device 11 is inserted into the device holding portion 35 of the holding device 31, the magnetic bodies 21 and 22 are inserted into the magnetic material holding portions 33 and 34, and the device holding portion 35 of the holding device 32. Then, the electric device 12 is inserted, the magnetic body 23 is inserted into the magnetic body holding portion 33, and the holding device 31 and the holding device 32 are connected by the connecting portion 36. As a result, as shown in FIG. 4, the positional relationship between the magnetic bodies 21, 22, 23 and the power receiving coils L11, L12 is fixed.

  That is, the two power receiving coils L11 and L12 are arranged side by side facing the power transmitting coil L1. One magnetic body 21 is disposed at an intermediate position between the two power receiving coils L11 and L12. In addition, one magnetic body 22 is disposed on the opposite side of the receiving coil L11 to the side adjacent to the receiving coil L12, and one sheet is provided on the side of the receiving coil L12 opposite to the side adjacent to the receiving coil L11. The magnetic body 23 is arranged. 4, the distance D8 between the left end of the power receiving coil L11 and the surface of the magnetic body 22, the distance D9 between the right end of the power receiving coil L11 and the surface of the magnetic body 21, the left end of the power receiving coil L12, and the surface of the magnetic body 21 And the distance D11 between the right end of the power receiving coil L12 and the surface of the magnetic body 23 are all equal to each other.

  In the present embodiment, the power receiving coil L11 corresponds to an example of a first power receiving coil, the power receiving coil L12 corresponds to an example of a second power receiving coil, the electric device 11 corresponds to an example of a first power receiving device, and the electric device 12 Corresponds to an example of the second power receiving device, the magnetic body 21 corresponds to an example of the intermediate magnetic part, the magnetic body 22 corresponds to an example of the first magnetic part, and the magnetic body 23 corresponds to an example of the second magnetic part. The magnetic bodies 21 to 23 correspond to an example of a magnetic part, the holding device 31 corresponds to an example of a first holding device, the holding device 32 corresponds to an example of a second holding device, and the holding devices 31 and 32 include This corresponds to an example of a holding device. In the present embodiment, the electric devices 11 and 12 correspond to an example of a power receiving unit, and the power receiving coils L11 and L12 correspond to an example of a power receiving coil. In the present embodiment, the device holding unit 35 of the holding device 31 corresponds to an example of a first holding unit, the device holding unit 35 of the holding device 32 corresponds to an example of a second holding unit, and the magnetic property of the holding device 31 is. The body holding part 33 corresponds to an example of a third holding part.

  FIG. 5 is a cross-sectional view seen from above showing the flow of magnetic flux in the contactless power transmission system 1 of the first embodiment. FIG. 6 is a cross-sectional view seen from above showing the flow of magnetic flux in a conventional non-contact power transmission system without a magnetic material as a comparative example. FIG. 7 is a cross-sectional view seen from above showing the flow of magnetic flux in the non-contact power transmission system 1 of the first embodiment when the position of the power receiving coil is shifted with respect to the power transmitting coil. FIG. 8 is a cross-sectional view as seen from above showing the flow of magnetic flux in a conventional non-contact power transmission system that does not include a magnetic material when the position of the power receiving coil is displaced from the power transmitting coil as a comparative example. FIG. 9 is a cross-sectional view seen from above showing the flow of magnetic flux in the non-contact power transmission system 1 of the first embodiment when only one power receiving coil is arranged.

  5 to 9, the magnetic flux lines are represented by arrows, the solid arrows indicate that the magnetic flux density is high, the dashed-dotted arrows indicate that the magnetic flux density is low, and the broken arrows indicate the lowest magnetic flux density. It shows that. The operation and effect of the contactless power transmission system 1 according to the first embodiment configured as described above will be described below with reference to FIGS.

  First, DC power is applied by the AC-DC converter 15, and the switching elements S <b> 1 to S <b> 4 perform a switching operation according to a control signal input from the control unit 16 via the gate resistors R <b> 1 to R <b> 4. AC power is supplied to the power transmission coil L1 connected between the full bridge circuits composed of the switching elements S1 to S4 by the switching operation of the switching elements S1 to S4, and the power transmission coil L1 is excited.

  The magnetic flux of the alternating magnetic field generated in the power transmission coil L1 is linked to the two power reception coils L11 and L12, and AC power is generated in each of the power reception coils L11 and L12. The AC power is rectified by the rectifier circuits BD1 and BD2, smoothed by the smoothing capacitors C31 and C32, and then supplied to the loads LD1 and LD2.

  At this time, as shown in FIG. 5, when the magnetic flux MF1 generated in the power transmission coil L1 is linked to the power reception coils L11 and L12, the magnetic bodies 21 and 22 on both sides of the power reception coil L11, and the both sides of the power reception coil L12. It passes through the magnetic bodies 21 and 23 as magnetic paths. Further, the magnetic flux MF2 interlinked with the power receiving coils L11 and L12 also passes through the magnetic bodies 21, 22, and 23 as magnetic paths. Thereby, the magnetic flux MF1 output from the power transmission coil L1 and the magnetic flux MF2 interlinking the power receiving coils L11 and L12 do not cancel each other.

  On the other hand, in the conventional non-contact power transmission system in which no magnetic material is arranged, as shown in FIG. 6, the magnetic flux MF11 output from the power transmission coil L1 and the magnetic flux interlinked with the power receiving coils L11 and L12. The MF 12 cancels each other. Therefore, the magnetic flux MF12 interlinking with the receiving coils L11 and L12 is weak. Moreover, in FIG. 6, since the magnetic path by a magnetic body like FIG. 5 is not formed, the magnetic flux MF13 from the power transmission coil L1 diverges at both ends.

  Here, as shown in FIG. 7, even when the positions of the two power receiving coils L11, L12 with respect to the power transmitting coil L1 are shifted to the left, in the first embodiment, the magnetic bodies 21, 22, 23 are magnetic paths. Since the magnetic flux is easily collected, the difference between the strength of the magnetic flux MF3 linked to the power receiving coil L11 and the strength of the magnetic flux MF4 linked to the power receiving coil L12 can be reduced.

  On the other hand, in the conventional non-contact power transmission system in which the magnetic body is not arranged, as shown in FIG. 8, since the magnetic path is not formed by the magnetic body, the magnetic flux MF14 interlinked with the power receiving coil L11. Thus, the magnetic flux MF15 interlinking with the power receiving coil L12 near the center of the power transmitting coil L1 is stronger, and the difference between the two is larger than that in the first embodiment.

  Furthermore, as shown in FIG. 9, when only one power receiving coil L <b> 11 is disposed facing the power transmission coil L <b> 1, that is, only one electrical device 11 is disposed facing the power transmission device 10. Even in this case, the magnetic bodies 21 and 22 form a magnetic path. For this reason, it can be set as magnetic flux distribution similar to the case where the two receiving coils L11 and L12 are arrange | positioned. As a result, even when the number of electrical devices arranged opposite to the power transmission device 10 is different, an increase in the difference in transmitted power from the power transmission device to each electrical device can be suppressed.

  As described above, according to the non-contact power transmission system 1 of the first embodiment, the positions of the power receiving coils L11 and L12 with respect to the power transmitting coil L1 are changed, or the number of power receiving coils arranged to face the power transmitting coil L1. Even if changes, the difference in the transmitted power with respect to the receiving coils L11 and L12 can be reduced.

  In addition, in the said 1st Embodiment, although the case where the two electric equipments 11 and 12 were arrange | positioned was shown, in the range in which a receiving coil can be arranged in parallel in the range which can fully receive the magnetic flux from the power transmission coil L1. If there are, there may be three or more electrical devices. Further, the number of magnetic bodies arranged is not limited to the above.

  FIG. 10 is a cross-sectional view seen from above showing the flow of magnetic flux in the non-contact power transmission system of the first embodiment when only one magnetic body 21 is arranged between the power receiving coils L11 and L12. is there. Also in FIG. 10, similarly to FIGS. 5 to 9, the magnetic flux lines are represented by arrows, the solid arrow indicates that the magnetic flux density is high, and the alternate long and short dash line arrow indicates that the magnetic flux density is low.

  For example, in FIG. 1, the magnetic body holding portion 33 of the holding device 31 holds the magnetic body 21, the magnetic body holding portion 34 of the holding device 31 does not hold the magnetic body, and the magnetic body holding portion 33 of the holding device 32 is magnetic. If the body is not held, the arrangement shown in FIG. 10 is realized.

  Even when only one magnetic body 21 is disposed, the disposed magnetic body 21 forms a magnetic path. Therefore, the magnetic flux MF1 from the power transmission coil L1 and the magnetic flux MF5 interlinked with the power receiving coils L11 and L12 do not cancel each other because they pass through the magnetic body 21 as a magnetic path. Therefore, even in the modified embodiment shown in FIG. 10, it is possible to reduce the amount of decrease in transmission power compared to the configuration of FIG. 6 in which no magnetic body is arranged.

(Second Embodiment)
FIG. 11 is a perspective view schematically showing the configuration of the non-contact power transmission system 1a of the second embodiment. FIG. 12 is a cross-sectional view of the power transmission coil L1a provided in the power transmission device 10a of the second embodiment as seen from the side. FIG. 13 is a cross-sectional view of the lower end portion of the main body portion 42a of the electric device 11a according to the second embodiment, viewed from the side. Here, only matters different from those of the first embodiment will be described, and the description of the first embodiment will be cited for those having the same configuration, operational effects, and the like.

  As shown in FIG. 11, the second embodiment is different from the first embodiment in that the magnetic bodies 21a, 21b, and 21c are incorporated as part of the electric devices 11a, 12a, and 13a, respectively. The power transmission device 10a is arranged below the electric devices 11a, 12a, and 13a. At this time, the power transmission device 10a includes a device holding unit that holds the electric devices 11a, 12a, and 13a, but is not illustrated in FIG.

  As shown in FIGS. 11 and 12, the power transmission coil L1a of the second embodiment is a rectangular planar coil formed by, for example, winding a copper wire in a spiral shape. As shown in FIG. 12, a magnetic sheet 17a made of a ferrite material, for example, is provided below the power transmission coil L1a.

  As shown in FIGS. 11 and 13, the power receiving coil L <b> 21 a of the second embodiment is a circular solenoid coil formed by winding a copper wire in a donut shape, for example. The power receiving coil L21a is provided at the lower end portion of the main body portion 42a of the electric device 11a.

  As shown in FIGS. 11 and 13, in the second embodiment, the magnetic body 21a has a hollow cylindrical shape and is provided so as to surround the power receiving coil L21a. Here, as shown in FIG. 13, the length D12 of the magnetic body 21a in the vertical direction is longer than the length D13 of the power receiving coil L21a in the vertical direction. The upper end of the magnetic body 21a substantially coincides with the upper end of the power receiving coil L21a, and the lower end of the magnetic body 21a extends below the lower end of the power receiving coil L21a, that is, toward the power transmission coil L1a.

  In addition, a secondary battery, an electric circuit, and the like that are loads exist above the power receiving coil L21a. Therefore, a shield 45 that shields the magnetic flux is provided so as not to be affected by the magnetic flux. Since the electric devices 12a and 13a are configured in exactly the same way as the electric device 11a, detailed description thereof is omitted.

  In the present embodiment, the power receiving coil L21a corresponds to an example of a first power receiving coil, the power receiving coil L21b corresponds to an example of a second power receiving coil, the electric device 11a corresponds to an example of a first power receiving device, and the electric device 12a. Corresponds to an example of the second power receiving device, and the magnetic bodies 21a and 21b correspond to an example of the magnetic part. In the present embodiment, the electric devices 11 and 12 correspond to an example of a power receiving unit, the power receiving coils L11 and L12 correspond to an example of a power receiving coil, and the magnetic bodies 21a and 21b correspond to an example of a magnetic unit.

  FIG. 14 is a cross-sectional view seen from the side showing the flow of magnetic flux in the non-contact power transmission system of the second embodiment. In FIG. 14, unlike FIG. 11, a case where two electric devices 11a and 12a are arranged above the power transmission device 10a is shown. Also in FIG. 14, similarly to FIGS. 5 to 10, magnetic flux lines are represented by arrows, and solid arrows indicate that the magnetic flux density is high.

  As shown in FIG. 14, in the non-contact power transmission system 1a of the second embodiment, the magnetic flux MF6 interlinked with the power receiving coil L21a passes through the magnetic body 21a surrounding the power receiving coil L21a as a magnetic path. The magnetic flux MF7 interlinked with the power receiving coil L21b passes through the magnetic body 21b surrounding the power receiving coil L21b as a magnetic path. Thereby, the magnetic flux MF6 interlinked with the power receiving coil L21a and the magnetic flux MF7 interlinked with the power receiving coil L21b do not interfere with each other. Therefore, even in the non-contact power transmission system 1a of the second embodiment, it is possible to reduce the amount of decrease in the transmission power from the power transmission device 10a to the electrical devices 11a and 12a as compared with the configuration in which the magnetic body is not disposed. .

  In the non-contact power transmission system 1a of the second embodiment, as shown in FIG. 13, the upper end of the magnetic body 21a substantially coincides with the upper end of the power receiving coil L21a. For this reason, compared with the structure which the upper end of the magnetic body 21a extends upwards rather than the upper end of the receiving coil L21a, size reduction of the main-body part 42a of the electric equipment 11a can be achieved. Even though the upper end of the magnetic body 21a substantially coincides with the upper end of the power receiving coil L21a, since the shield 45 is provided immediately above, the magnetic flux MF6 interlinking the power receiving coil L21a is linked to the power receiving coil L21b. The possibility of interference with the intersecting magnetic flux MF7 is low.

  In the non-contact power transmission system 1a of the second embodiment, as shown in FIG. 13, the length D12 of the magnetic body 21a in the vertical direction is longer than the length D13 of the power receiving coil L21a in the vertical direction. And the lower end of the magnetic body 21a is extended below from the lower end of the receiving coil L21a. For this reason, compared with the structure where the lower end of the magnetic body 21a coincides with the lower end of the power receiving coil L21a, the interference between the magnetic flux MF6 interlinked with the power receiving coil L21a and the magnetic flux MF7 interlinked with the power receiving coil L21b is more reliably performed. Can be prevented.

  Further, in the non-contact power transmission system 1a of the second embodiment, unlike the non-contact power transmission system 1 of the first embodiment, the magnetic bodies 21a and 21b are not visible from the outside. Therefore, according to the non-contact power transmission system 1a of the second embodiment, the non-contact power transmission system 1a can be used without making the user feel the presence of the magnetic material.

  In the non-contact power transmission system 1a of the second embodiment, the magnetic body 21a has a hollow cylindrical shape and is provided so as to surround the power receiving coil L21a. However, the shape of the magnetic body 21a is as follows. Not limited. The power receiving coil L21a may include a magnetic core.

  FIG. 15 is a perspective view showing examples of different shapes of magnetic bodies. The magnetic body shown in FIG. 15 has a shape such that a hollow cylindrical magnetic body 21a (for example, FIG. 13) is cut in the vertical direction. That is, each of the magnetic bodies 21d and 21e has a curved shape, and is provided so as to surround the power receiving coil L21a with a gap between them.

  The gap between the magnetic bodies 21d and 21e is provided in a direction orthogonal to the arrangement direction of the electric devices 11a, 12a, and 13a. That is, the magnetic body 21e is provided so as to shield between the adjacent power receiving coils L21b.

  The magnetic bodies 21d and 21e having the shape shown in FIG. 15 can also prevent interference between the power receiving coil L21a and the adjacent power receiving coil L21b. Further, according to the magnetic bodies 21d and 21e having the shape shown in FIG. 15, the magnetic material can be reduced as compared with the magnetic body 21a having the shape of the second embodiment.

(Third embodiment)
FIG. 16 is a perspective view schematically showing the external appearance of the power transmission device 10 and the electric equipment 11b used in the non-contact power transmission system 1b of the third embodiment. FIG. 17 is a diagram schematically illustrating a power receiving coil and a device coil used in the non-contact power transmission system 1b according to the third embodiment. FIG. 18 is a diagram schematically illustrating an electric circuit of the contactless power transmission system 1b according to the third embodiment. Here, only matters different from those of the first embodiment will be described, and the description of the first embodiment will be cited for those having the same configuration, operational effects, and the like.

  The difference of the third embodiment from the first embodiment is that in the first embodiment, the receiving coil L11 and the receiving capacitor C11 that are electrically connected to the rectifier circuit BD1 as shown in FIG. As shown in FIG. 18, the power receiving resonance circuit LC11 is not electrically connected to the rectifier circuit BD1, and constitutes an independent relay section 14a.

  Similarly, in the first embodiment, a power receiving resonance circuit LC12 including a power receiving coil L12 and a power receiving capacitor C12, which is electrically connected to the rectifier circuit BD2 as shown in FIG. 3, is shown in FIG. Thus, it is not electrically connected to the rectifier circuit BD2, and constitutes an independent relay unit 14b.

  As shown in FIG. 18, in the electrical device 11b, instead of the power receiving coil L11 and the power receiving capacitor C11, a device coil L31 is electrically connected to the rectifier circuit BD1. Moreover, in the electric equipment 12b, it replaces with the receiving coil L12 and the receiving capacitor C12, and the apparatus coil L32 is electrically connected with rectifier circuit BD2. That is, as illustrated in FIG. 18, the relay unit 14a is not electrically connected to either the power transmission device 10 or the electric device 11b (load LD1). Moreover, the relay part 14b is not electrically connected to either the power transmission apparatus 10 or the electric equipment 12b (load LD2).

  As shown in FIG. 17, each of the power receiving coil L11 and the device coil L31 is a rectangular planar coil formed by, for example, winding a copper wire in a spiral shape. The device coil L31 is designed to match the capacity of the load LD1. And as FIG. 16 shows, the receiving coil L11 and the apparatus coil L31 are piled up mutually, for example in the state which touches physically, and are incorporated in the main-body part 42b of the electric equipment 11b. The power receiving coil L12 and the device coil L32 are also configured and arranged in the same manner as the power receiving coil L11 and the device coil L31, respectively.

  In the present embodiment, the receiving coil L11 corresponds to an example of a first receiving coil, the receiving capacitor C11 corresponds to an example of a first capacitor, the receiving coil L12 corresponds to an example of a second receiving coil, and the receiving capacitor C12 includes The power receiving resonance circuit LC11 corresponds to an example of a first resonance circuit, the power reception resonance circuit LC12 corresponds to an example of a second resonance circuit, and the electric device 11b corresponds to an example of a first power reception device. The electric device 12b corresponds to an example of the second power receiving device, the device coil L31 corresponds to an example of the first device coil, the device coil L32 corresponds to an example of the second device coil, and the load LD1 is the first. This corresponds to an example of a load, and the load LD2 corresponds to an example of a second load.

  The operation and action of the contactless power transmission system 1b according to the third embodiment will be described below with reference to FIGS.

  First, similarly to the first embodiment, the magnetic flux of the alternating magnetic field generated in the power transmission coil L1 is linked to the power reception coils L11 and L12 by magnetic resonance between the power transmission resonance circuit LC1 and the power reception resonance circuit LC11. The magnetic fluxes linked to the power receiving coils L11 and L12 are linked to the device coils L31 and L32 having large coupling by being physically in contact with the power receiving coils L11 and L12, respectively. AC power is generated by the magnetic flux linked to the device coils L31 and L32. The device coils L31 and L32 are matched with the capacities of the loads LD1 and LD2, respectively. For this reason, the AC power generated in the device coils L31 and L32 is efficiently sent to the loads LD1 and LD2, respectively.

  Thus, in the non-contact power transmission system 1b of the third embodiment, the power receiving resonance circuit LC11 and the load LD1 are not electrically connected, and the power receiving resonance circuit LC12 and the load LD2 are electrically connected. Not. Therefore, compared with the non-contact power transmission system 1 of the first embodiment in which the power receiving resonance circuit LC11 and the load LD1 are electrically connected and the power receiving resonance circuit LC12 and the load LD2 are electrically connected, It is possible to suppress a decrease in the Q value of the power receiving resonance circuits LC11 and LC12. As a result, according to the non-contact power transmission system 1b of the third embodiment, it is possible to transmit power with higher efficiency than the non-contact power transmission system 1 of the first embodiment.

  Therefore, in the non-contact power transmission system 1b of the third embodiment, when obtaining the same level of transmission power as the non-contact power transmission system 1 of the first embodiment, the power transmission distance, that is, the power transmission device 10 It becomes possible to increase the distance between the electric devices 11b and 12b. Therefore, the electric devices 11b and 12b can be freely used without being limited to the distance from the power transmission device 10. As a result, the degree of freedom of the usage mode of the electric devices 11b and 12b can be improved.

  In the non-contact power transmission system 1b according to the third embodiment, the power receiving coils L11 and L12 and the device coils L31 and L32 are arranged so as to overlap each other in a state where they are physically in contact with each other. For this reason, the fall of each power transmission efficiency from the receiving coils L11 and L12 to the apparatus coils L31 and L32 can be suppressed.

  In the third embodiment, the relay unit 14a including the power reception resonance circuit LC11 is built in the electric device 11b, and the relay unit 14b including the power reception resonance circuit LC12 is built in the electric device 12b. Alternatively, the relay unit 14a including the power receiving resonance circuit LC11 may be provided outside the electric device 11b, and the relay unit 14b including the power receiving resonance circuit LC12 may be provided outside the electric device 12b. However, in order to prevent a reduction in power transmission efficiency from the power receiving coils L11 and L12 to the device coils L31 and L32, the power receiving coil L11 is disposed in the vicinity of the device coil L31, and the power receiving coil L12 is disposed in the vicinity of the device coil L32. It is preferable.

(Other)
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various deformation | transformation is possible.

  The power transmission coil L1 and the power receiving coils L11, L12, L21a to L21c are not limited to a rectangular planar coil or a circular solenoid coil, and may be a circular planar coil or a rectangular solenoid coil. In addition, the combination of the shape of each coil is not limited. Moreover, when it is a thin plane coil, you may curve not only in flat form but in that case, the direction to curve can also be changed suitably.

  The material of the magnetic bodies 21 to 23 and 21a to 21c may not be ferrite. In order to obtain an inductance suitable for coil design, a magnetic material made of an amorphous metal such as an amorphous alloy or a magnetic material made of a mixture of other materials is appropriately used as the magnetic bodies 21 to 23 and 21a to 21c. Good. In addition, you may use a different magnetic material as the magnetic bodies 21-23 and 21a-21c, In that case, the combination of the magnetic material of each magnetic body is not limited. Further, as the magnetic bodies 21 to 23 and 21a to 21c, a sintered magnetic material may be used instead of the magnetic sheet formed into a plate shape as in the above embodiments. By using a sintered magnetic material, the cost of the magnetic material can be reduced.

  The switching circuit in the power transmission device 1 is a full bridge circuit using four switching elements in each of the above embodiments, but may be a half bridge circuit using two switching elements. The rectifier circuits BD1 and BD2 in the electrical device are full-wave rectifier circuits in the above embodiments, but may be half-wave rectifier circuits.

  In each said embodiment, although the electric equipment 11, 12, 11a-13a, 11b, 12b illustrated the electric toothbrush, it is not restricted to this. As the electric appliances 11, 12, 11a to 13a, 11b, 12b, for example, small appliances generally referred to as hairdressing appliances such as an electric shaver or an electric hair remover mainly used around the bathroom are applied. Also good. Furthermore, as the electric devices 11, 12, 11a to 13a, 11b, and 12b, a personal computer used in an office or the like may be applied, or a lighting device that illuminates a product displayed in a store may be applied.

  In addition, for example, an electric toothbrush is applied as the electric device 11 and an electric shaver is applied as the electric device 12, and different electric devices are applied as a plurality of electric devices that receive electric power from the power transmission device 10 in a contactless manner. Also good.

  A non-contact power transmission system and a power receiving device and a holding device used in the non-contact power transmission system according to the present invention can reduce a decrease in power transmission efficiency from a power transmission device to a plurality of power reception devices. It is useful as a power receiving device and a holding device used in the non-contact power transmission system.

1, 1a, 1b Non-contact power transmission system 10, 10a Power transmission device 11, 12, 11a, 12a, 13a, 11b, 12b Electrical equipment 21-23, 21a-21e Magnetic body 31, 32 Holding device C1 Power transmission capacitor C11, C12 Power receiving capacitor L1, L1a Power transmission coil L11, L12, L21a, L21b, L21c Power receiving coil L31, L32 Equipment coil LC1 Power transmission resonance circuit LC11, LC12 Power reception resonance circuit LD1, LD2 Load

Claims (15)

A power transmission device that generates an alternating magnetic field;
A first power receiving device including a first power receiving coil interlinked with the magnetic flux of the alternating magnetic field;
A second power receiving device including a second power receiving coil interlinked with the magnetic flux of the alternating magnetic field, and arranged in parallel with the first power receiving device;
A magnetic part including an intermediate magnetic part having a magnetic material disposed between the first power receiving coil and the second power receiving coil;
A non-contact power transmission system comprising: The magnetic part includes: a first magnetic part having a magnetic material disposed adjacent to the first power receiving coil; and a second magnetic part having a magnetic material disposed adjacent to the second power receiving coil. In addition,
The first power receiving coil is disposed between the first magnetic part and the intermediate magnetic part,
The non-contact power transmission system according to claim 1, wherein the second power receiving coil is disposed between the second magnetic part and the intermediate magnetic part.   The intermediate magnetic part is disposed so that a distance between the first power receiving coil and the intermediate magnetic part is equal to a distance between the second power receiving coil and the intermediate magnetic part. Item 3. The contactless power transmission system according to item 1 or 2.   The said intermediate | middle magnetic part is one magnetic body arrange | positioned in the intermediate point of a said 1st receiving coil and a said 2nd receiving coil, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. Non-contact power transmission system.   5. The length of the intermediate magnetic part in the vertical direction is longer than the length of the first power receiving coil in the vertical direction and longer than the length of the second power receiving coil in the vertical direction. The non-contact electric power transmission system of any one of Claims.   The said intermediate | middle magnetic part is provided so that it may extend in the both directions of the surface side and back surface side of the magnetic flux linkage surface of a said 1st receiving coil and a said 2nd receiving coil. The non-contact electric power transmission system of any one of Claims.   The length of the intermediate magnetic part in the direction perpendicular to the flux linkage surface of the first power receiving coil is the length of the first power receiving coil in the direction in which the first power receiving coil and the second power receiving coil are aligned. The contactless power transmission system according to claim 1, wherein each of the second power receiving coils is longer than a length of each of the second power receiving coils. The power transmission device includes a power transmission resonance circuit having a power transmission coil and a power transmission capacitor connected to the power transmission coil,
The first power receiving device is connected to the first power receiving coil, forms a first resonance circuit together with the first power receiving coil, and a first device coil magnetically coupled to the first power receiving coil. And a first load that is electrically connected to the first device coil and receives a supply of electric power induced in the first device coil,
The second power receiving device is connected to the second power receiving coil, forms a second resonance circuit together with the second power receiving coil, and a second device coil magnetically coupled to the second power receiving coil. And a second load that is electrically connected to the second device coil and receives a supply of electric power induced in the second device coil,
The first resonance circuit is not electrically connected to the first device coil and the first load,
The contactless power transmission system according to any one of claims 1 to 7, wherein the second resonance circuit is not electrically connected to the second device coil and the second load.   The contactless power transmission system according to claim 1, further comprising a holding device that holds the magnetic part.   The contactless power transmission system according to claim 9, wherein the holding device further holds the first power receiving device and the second power receiving device.   The contactless power transmission system according to claim 9 or 10, wherein the holding device is configured to detachably hold the magnetic part. A first holding device for holding the first power receiving device;
A second holding device that holds the second power receiving device;
The contactless power transmission system according to any one of claims 1 to 8, wherein the first holding device and the second holding device are configured to be connectable to each other.   9. The non-contact power transmission system according to claim 1, wherein the magnetic unit is built in each of the first power receiving device and the second power receiving device. 10. A power receiving device used in the non-contact power transmission system according to any one of claims 1 to 13,
A power receiving unit including a power receiving coil interlinked with the magnetic flux of the alternating magnetic field;
A magnetic part having a magnetic material disposed adjacent to the power receiving coil;
A power receiving device comprising: A holding device used in the non-contact power transmission system according to any one of claims 1 to 13,
A first holding unit for holding the first power receiving device;
A second holding unit for holding the second power receiving device;
A third holding part for holding the intermediate magnetic part;
With
The first holding unit, the second holding unit, and the third holding unit are arranged such that the first power receiving device and the second power receiving device are arranged side by side, and the first power receiving coil and the second power receiving device are arranged in parallel. A holding device, wherein the intermediate magnetic unit is arranged between the power receiving coil and the power receiving coil.

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