JP2013078234A - Planar coil, coil module with the same, power reception apparatus for contactless power transmission apparatus with the same, and contactless power transmission apparatus with the same - Google Patents

Abstract

A planar coil capable of suppressing eddy current loss, a coil module including the same, a power receiving device of a non-contact power transmission device including the same, and a non-contact power transmission device including the power coil are provided. The secondary coil is a flat coil formed by winding rectangular wires 43A and 43B having a rectangular cross section into a conductive wire, and the flat wires 43A and 43B are formed on the upper surfaces 46A and 46B of the rectangular wire 43A. , 43B extending in the extending direction is formed.
[Selection] Figure 3

Description

  The present invention relates to a planar coil formed by winding a rectangular wire having a rectangular cross section into a conductive wire, a coil module including the same, a power receiving device of a non-contact power transmission device including the same, and a non-contact including the same The present invention relates to a contact-type power transmission device.

  There has been proposed a non-contact type power transmission device in which a power transmission device and a power reception device are in an electrically non-contact state and power can be transmitted between the two devices. The power transmission of this non-contact power transmission device is performed using the electromagnetic induction action of the coils provided in both the power transmission device and the power reception device.

  By the way, since many non-contact-type electric power transmission apparatuses are requested | required of size reduction, generally a planar coil is used as a coil provided in a power transmission apparatus and a power receiving apparatus. For example, as such a planar coil, Patent Document 1 describes a configuration in which a plurality of round wires having a circular cross-sectional shape of conductive wires are aligned in parallel and wound in a planar shape. .

JP 2010-16235 A

  However, when a planar coil is formed using a round wire as the conductive wire, the area of the gap between the conductive wires increases, so the ratio of the cross-sectional area of the conductive wire to the cross-sectional area of the planar coil, that is, the space factor decreases. . As a result, the conductive wire, and thus the planar coil, generates heat. In this regard, when the planar coil is formed using a square wire having a square cross-sectional shape of the conductive wire, the area of the gap between the conductive wires is compared with the case where the planar coil is formed using a round wire. Can be reduced, so that the space factor can be increased. However, for example, when a planar coil is formed by winding a plurality of square wires in parallel, the square wires may be individually separated and twisted, resulting in a decrease in productivity or use of round wires. In other words, the space factor of the conductive wire may be reduced.

  Therefore, if a rectangular wire, which is a conductive wire having a larger cross-sectional area than a rectangular wire, is used, a planar coil having the same space factor can be formed with a smaller number than the rectangular wire. That is, it can suppress that productivity mentioned above falls. However, when a rectangular wire is adopted as the conductive wire in this way, a large eddy current is likely to be generated by the magnetic flux passing through the conductive wire, and this is consumed as heat energy, so that the eddy current loss is relatively large. Tend to be.

  The present invention has been made to solve the above-described problem, and is a planar coil capable of suppressing eddy current loss, a coil module including the same, and a power receiving device of a non-contact power transmission apparatus including the same, And it aims at providing a non-contact-type electric power transmission device provided with the same.

  The planar coil of the present invention is a planar coil formed by winding a rectangular wire having a rectangular cross section as a conductive wire in a planar shape, and the conductive wire extends to at least one of the upper surface and the lower surface in the extending direction. It is characterized in that a notch is formed.

-In this planar coil, it is preferable that the conductive wires are arranged in parallel and the collective conductive wires having their ends electrically connected are wound in a planar shape.
-In this planar coil, it is preferable that the said assembly conductive wire is wound so that the position of the said conductive wire of an outer peripheral side and the said conductive wire of an inner peripheral side may change in the middle of the circumferential direction of the said planar coil.

-In this planar coil, it is preferable that the single said conductive wire is return | folded in the middle of the circumferential direction of the said planar coil.
The planar coil preferably includes a first coil and a second coil connected in series to the first coil, and the first coil and the second coil are laminated.

In this planar coil, it is preferable that the winding direction of the first coil and the second coil is set to be opposite.
-The coil module of this invention is provided with the magnetic body for reducing a leakage magnetic flux in at least one of the said upper surface and the said lower surface of the planar coil mentioned above.

  The power receiving device of the non-contact power transmission device of the present invention is a power receiving device of the non-contact power transmission device that receives power transmitted from the power transmission device by the power receiving coil module, and the coil module described above as the power receiving coil module Is provided.

  -The non-contact-type electric power transmission apparatus of this invention is equipped with the power transmission apparatus and the power receiving apparatus, The power receiving apparatus mentioned above is provided as said power receiving apparatus, It is characterized by the above-mentioned.

  According to the present invention, a planar coil capable of suppressing eddy current loss, a coil module including the same, a power receiving device of a non-contact power transmission device including the same, and a non-contact power transmission device including the power receiving device. Can be provided.

Sectional drawing which shows the cross-sectional structure about the non-contact-type electric power transmission apparatus of one Embodiment of this invention. The perspective view which shows the perspective structure of a secondary side coil. The perspective view which shows the expansion perspective structure of the area | region X of FIG. (A) is a perspective view which shows the perspective structure of the conventional flat wire, (b) is a perspective view which shows the perspective structure of the flat wire used by this embodiment. The schematic diagram which shows the equivalent circuit of a secondary side coil about the non-contact-type electric power transmission apparatus of a comparative example. The schematic diagram which shows the equivalent circuit of a secondary side coil about the non-contact-type electric power transmission apparatus of this embodiment. The perspective view which shows the perspective structure of a secondary side coil about the non-contact-type electric power transmission apparatus concerning other embodiment of this invention. The top view which shows the planar structure of a planar coil about the non-contact-type electric power transmission apparatus of the embodiment. The top view which shows the planar structure of a planar coil about the non-contact-type electric power transmission apparatus of the embodiment. The perspective view which shows the perspective structure of a flat wire about the non-contact-type electric power transmission apparatus of the embodiment. The perspective view which shows the perspective structure of a flat wire about the non-contact-type electric power transmission apparatus of the embodiment. The perspective view which shows the perspective structure of a flat wire about the non-contact-type electric power transmission apparatus of the embodiment. The perspective view which shows the perspective structure of a flat wire about the non-contact-type electric power transmission apparatus of the embodiment.

With reference to FIG. 1, the whole structure of the non-contact-type electric power transmission apparatus concerning this invention is demonstrated.
The non-contact power transmission device includes a power reception device 20 having a secondary battery 22 and a power transmission device 10 that transmits power to the power reception device 20. In FIG. 1, a mobile phone is illustrated as the power receiving device 20.

  The power transmission device 10 is provided with a primary coil module 30 that transmits power and signals to the power receiving device 20 and a housing 11 that houses various components including the primary coil module 30. A mounting surface 11 </ b> A for mounting the power receiving device 20 is formed on the housing 11.

  In the primary coil module 30, a magnetic body 32 that suppresses leakage of magnetic flux generated in the primary side coil 31 is assembled to the primary side coil 31 that generates magnetic flux when electric power is supplied. . The magnetic body 32 includes a bottom wall portion 32 </ b> A that faces the bottom surface of the primary coil 31, and a peripheral wall portion 32 </ b> B that surrounds the outer periphery of the primary coil 31. The bottom wall portion 32A and the peripheral wall portion 32B are made of a ferrite material.

  The power receiving device 20 includes a secondary coil module 40 that receives power and signals transmitted from the power transmitting device 10, and a housing 21 that houses various components including the secondary coil module 40 and the secondary battery 22. And are provided. The secondary coil module 40 corresponds to a “power receiving coil module”.

  In the secondary coil module 40, the secondary coil 41 that generates an induced current by interlinking with the magnetic flux generated in the primary coil 31 suppresses leakage of magnetic flux generated in the primary coil 31. A magnetic body 42 is assembled.

  The magnetic body 42 is provided with a contact surface 42A with which the bottom surface of the secondary coil 41 contacts. The outer diameter of the magnetic body 42 is set larger than the outer diameter of the secondary coil 41. As the magnetic body 42, a sheet-like member made of an amorphous material is used.

Next, a power supply mode of the non-contact power transmission apparatus will be described.
When the power receiving device 20 is mounted on the mounting surface 11 </ b> A of the power transmission device 10, the primary coil module 30 of the power transmission device 10 and the secondary coil module 40 of the power reception device 20 face each other. In this state, high-frequency alternating magnetic flux is generated in the primary coil 31 by supplying an alternating current to the primary coil 31. The alternating magnetic flux is linked to the secondary coil 41 to generate alternating power in the secondary coil 41. The alternating power is smoothed and rectified by a rectifier circuit (not shown) and supplied to the secondary battery 22.

  A detailed configuration of the secondary coil 41 will be described with reference to FIG. Hereinafter, in the secondary coil 41, the direction orthogonal to the center line C is referred to as a “radial direction”. In addition, a direction toward the center line C in the radial direction is “inward”, and a direction away from the center line C in the radial direction is “outward”. Furthermore, the direction in which the secondary coil 41 is wound from the inside toward the outside is defined as the winding direction.

  The secondary coil 41 is formed by aligning two conductive wires, specifically, rectangular wires 43A and 43B having a rectangular cross-section in parallel, and end portions 51A and 51B, and end portions 61A and 61B. Is a planar coil formed by winding a collective conductive wire 43 electrically connected to each other in a planar shape. That is, the secondary coil 41 includes a first coil 50 around which the collective conductive wire 43 is wound, and a second coil that is connected in series with the first coil 50 and stacked on the first coil 50. The coil 60 has a continuous portion 44 located at the boundary between the first coil 50 and the second coil 60. The winding direction of the first coil 50 and the second coil 60 is set to be opposite. That is, the winding method of the secondary coil 41 is so-called alpha winding.

  The continuous portion 44 has a folded portion 44A where the positions of the rectangular wire 43A on the outer peripheral side in the first coil 50 and the rectangular wire 43B on the inner peripheral side in the first coil 50 are interchanged in the circumferential direction of the secondary coil 41. Is provided. That is, since such a folded portion 44A is formed, in the second coil 60, the flat wire 43A is located on the inner peripheral side, and the flat wire 43B is located on the outer peripheral side.

The shape of the collective conductive wire 43 will be described in detail with reference to FIG.
As the rectangular wires 43A and 43B constituting the collective conductive wire 43, copper wires having upper surfaces 46A and 46B and lower surfaces 47A and 47B and having a rectangular cross section are used. These rectangular wires 43A and 43B have their upper surfaces 46A and 46B, lower surfaces 47A and 47B, and side surfaces covered with an enamel layer (not shown), and the enamel layer has a self-bonding fusion layer ( (Not shown). Therefore, the flat wire 43A and the flat wire 43B are self-fused by this fusion layer.

  A plurality of cuts 45 extending in the extending direction of the collective conductive wires 43 are formed on the upper surfaces 46A and 46B of the flat wires 43A and 43B. The facing cut surfaces 48A and 48B of the cut 45 are also covered with an enamel layer in the same manner as the upper surfaces 46A and 46B. For this reason, the cut surface 48A and the cut surface 48B are electrically insulated.

Further, the cut 45 does not reach the lower surfaces 47A and 47B. That is, the cut 45 does not penetrate the upper surfaces 46A and 46B and the lower surfaces 47A and 47B.
With reference to FIG. 4, the eddy current generated in the collective conductive wire 43 will be described.

  As shown in FIG. 4A, the above-described cuts are not formed in the upper surfaces 72A and 72B and the lower surfaces 73A and 73B of the collective conductive wire 71 configured by conventional ordinary rectangular wires 71A and 71B. Therefore, when the magnetic flux B generated in the primary coil 31 passes through the collective conductive wire 71, an eddy current W1 is generated over a wide range.

  On the other hand, as shown in FIG. 4B, when the magnetic flux B generated in the primary coil 31 passes through the collective conductive wire 43, an eddy current W2 is generated. Here, since the notch 45 is provided in the collective conductive wire 43, the generation of eddy currents straddling the notch 45 is suppressed, and the portion where the eddy current W2 is generated is reduced. That is, since the electrical resistance of the portion where the eddy current W2 flows in the collective conductive line 43 is increased, the eddy current W2 is smaller than that of the collective conductive line 71 in which the notch shown in FIG. .

  Next, referring to FIG. 5, “comparison coil 41 </ b> X”, that is, a secondary side coil having a configuration in which the turn-back portion 44 </ b> A is omitted from the secondary side coil 41 of the contactless power transmission device of this embodiment. The induced current will be described. In the following description of the comparison coil 41X, the same reference numerals are given to the components common to the secondary coil 41 of the present embodiment. Further, in order to simplify the description of the configuration of the comparison coil 41X, the number of turns of the collective conductive wire 43 is changed from 2 turns to 1 turn.

  When the magnetic flux B generated in the primary coil 31 passes near the center of the comparison coil 41X, the current IA flows through the collective conductive wire 43. On the other hand, when the magnetic flux Bc generated in the primary coil 31 passes between the collective conductive wires 43, that is, between the rectangular wire 43A and the rectangular wire 43B, the rectangular wire 43A, 43B has an induced current ia. Tries to flow. This induced current ia becomes a loop current that circulates around the first coil 50 and the second coil 60 and prevents the flow of the current IA. As a result, an increase in power transmission loss due to the generation of such a loop current is unavoidable.

  Next, an induced current generated in the secondary coil 41 will be described with reference to FIG. In order to simplify the description of the configuration of the secondary coil 41, the number of turns of the collective conductive wire 43 is changed from 2 turns to 1 turn as in FIG.

  When the magnetic flux B generated in the primary coil 31 passes near the center of the secondary coil 41, the current IA flows through the collective conductive wire 43. On the other hand, when the magnetic flux Bc from the primary coil 31 passes between the collective conductive wires 43, that is, between the flat wire 43A and the flat wire 43B, an induced current ia is generated in these flat wires 43A and 43B. Try to flow.

Here, when focusing on the first coil 50, the induced current ia flows toward the folded portion 44 </ b> A of the continuous portion 44. On the other hand, when focusing on the second coil 60, the induced current ia flows on the folded portion of the continuous portion 44. It tries to flow toward 44A. That is, since the directions of the induced current ia of the first coil 50 and the induced current ia of the second coil 60 are reversed, these are canceled out. Therefore, in the secondary coil 41, such a loop current is not generated, or only a relatively small loop current flows as compared with the loop current flowing through the comparison coil 41X. As a result, an increase in power transmission loss due to the occurrence of such a loop current can be suppressed, and a large amount of power can be supplied to the secondary battery 22.
(Effect of embodiment)
According to the non-contact power transmission apparatus of the present embodiment, the following effects can be obtained.

  (1) The secondary coil 41 is a planar coil formed by winding rectangular wires 43A and 43B having a rectangular cross section into a conductive wire, and the rectangular wires 43A and 43B are formed on the upper surfaces 46A and 46B of the rectangular wire 43A. , 43B extending in the extending direction is formed.

  According to this configuration, since the rectangular wires 43A and 43B are employed as the conductive wires, the area of the gap existing between the conductive wires is smaller than that of, for example, a planar coil obtained by winding a round wire in a planar shape. For this reason, the ratio of the cross-sectional area of the conductive wire to the cross-sectional area of the planar coil, that is, the space factor can be increased, and the secondary coil 41 can be prevented from generating heat.

  Further, in such a planar coil that employs rectangular wires 43A and 43B as the conductive wires, a large eddy current is likely to be generated in the conductive wires when the magnetic flux passes, and this is consumed as thermal energy, thereby eddy current loss. Tends to be relatively large. In this respect, since a plurality of cuts 45 extending in the extending direction are formed on the upper surfaces 46A and 46B of the rectangular wires 43A and 43B, the generation of eddy currents straddling the cuts 45 is suppressed. The part to do becomes small. Therefore, compared to the case where the notch 45 is not provided, the generation of eddy current can be suppressed, and the eddy current loss as described above can be reduced.

  Further, since the shape of the rectangular wires 43A and 43B is maintained by the portion where the notch 45 is not formed, for example, when the secondary coil 41 is formed by winding a plurality of round wires or square wires in parallel. Unlike the case where the rectangular wires 43A and 43B are individually separated at the time of the formation, the windings are not regularly aligned, and the individual conductive wires are not twisted when the square wires are used. High productivity efficiency in the coil 41 can be maintained.

  (2) The secondary coil 41 includes the collective conductive wire 43 in which the rectangular wires 43A and 43B are aligned in parallel to electrically connect the end portions 51A and 51B and the end portions 61A and 61B. It is wound in a flat shape. Therefore, the number of turns required for the secondary coil 41 can be ensured while suppressing an increase in the thickness of the secondary coil 41.

  (3) The collective conductive wire 43 is formed between the flat wire 43A and the flat wire 43B so that the positions of the flat wire 43A and the flat wire 43B on the outer peripheral side of the end portion 51A and the end portion 51B are interchanged at the end portion 61A and the end portion 61B. The coil is wound so that the position is changed in the middle of the secondary coil 41 in the circumferential direction.

  When the magnetic flux passes between the rectangular wires 43A and 43B constituting the collective conductive wire 43, an induced current tends to be generated in the rectangular wires 43A and 43B by this magnetic flux. In this regard, according to the present embodiment, the positions of the rectangular wire 43A on the outer peripheral side and the rectangular wire 43B on the inner peripheral side are switched between the end portions 51A and 51B and the end portions 61A and 61B of the collective conductive wire 43. Generation of a loop current in which the current circulates the rectangular wires 43A and 43B of the secondary coil 41, and an increase in power transmission loss due to the generation of the loop current can be suppressed.

  (4) The secondary coil 41 includes a first coil 50 and a second coil 60 connected in series thereto, and the first coil 50 and the second coil 60 are laminated. Therefore, the number of turns required for the secondary coil 41 can be secured while suppressing an increase in the radial thickness of the secondary coil 41.

  (5) The winding direction of the first coil 50 and the second coil 60 is set to be opposite. Therefore, since the secondary coil 41 is a so-called alpha winding in which the winding method of the collective conductive wire 43 is different, each end 51A, 51B and 61A, 61B of the collective conductive wire 43 is connected to the inner diameter of the secondary coil 41. There is no need to pull out from the section. Therefore, the thickness of the secondary coil 41 is increased due to pulling out the end portions 51A and 51B and the end portions 61A and 61B of the rectangular wires 43A and 43B from the inner diameter portion of the secondary coil 41 in this way. Can be suppressed.

  (6) The secondary coil 41 is provided with a magnetic body 42 for reducing leakage magnetic flux. Therefore, the leakage magnetic flux in the secondary coil module 40 can be reduced, and the decrease in power transmission efficiency due to the increase in the leakage magnetic flux can be suppressed.

(Other embodiments)
The embodiment of the present invention is not limited to the contents of the above embodiment, and can be modified as follows, for example. Further, the following modified examples are not applied only to the above embodiment, and different modified examples can be implemented in combination with each other.

  As shown in FIG. 7, in the secondary side coil 41, the folded portion 44 </ b> A can be omitted from the continuous portion 44 that is a boundary portion between the first coil 50 and the second coil 60. At this time, in both the first coil 50 and the second coil 60, the flat wire 43A is located on the outer peripheral side, and the flat wire 43B is located on the inner peripheral side. Even if it is such a structure, there can exist an effect according to said (1), (2) and (4)-(6).

  In order to suppress the loop current that circulates around each rectangular wire 43A, 43B, in other words, in order to effectively cancel the induced current that flows through the rectangular wires 43A, 43B, as in the above embodiment, It is preferable to replace the positions of the rectangular wire 43A and the rectangular wire 43B at the continuous portion 44 that is the center of the collective conductive wire 43 that constitutes the secondary coil 41. However, the positions of the flat wire 43 </ b> A and the flat wire 43 </ b> B can be switched in the middle of the first coil 50 or the second coil 60.

  The secondary coil 41 may be formed by winding a single rectangular wire 43 </ b> A in a planar shape and folding the rectangular wire 43 </ b> A in the middle of the secondary coil 41 in the circumferential direction. Since the flat wire 43A has a plurality of cuts 45 on the upper surface 46A and conforms to the collective conductive wire 43, the effect according to the above (3) can be achieved. In this case, it is preferable that the plurality of cuts 45 are formed on the entire circumference of the rectangular wire 43A on at least one of the upper surface 46A and the lower surface 47A of the single rectangular wire 43A. Note that “turning back” means turning back so that the upper surface 46A and the lower surface 47A of the flat wire 43A are interchanged.

As shown in FIG. 8, the secondary coil 90 can be configured by winding a single rectangular wire 80 having a cut 81.
As shown in FIG. 9, the secondary coil 110 is formed by only one layer by winding the collective conductive wire 101 having the notch 103 and the two parallel rectangular wires 101A and 101B in parallel. Can do. At this time, the inner periphery and the outer periphery in the circumferential direction of the secondary coil 110 are interchanged in the intermediate portion 102 in the circumferential direction of the rectangular wires 101A and 101B. Even with such a configuration, the generation of the loop current as described above can be suppressed.

  As shown in FIG. 10, cuts 124 can be provided on both the upper surfaces 122A and 122B and the lower surfaces 123A and 123B of the collective conductive wire 121 composed of the flat wire 121A and the flat wire 121B.

  As shown in FIG. 11, a secondary coil is formed by winding a collective conductive wire 131 in which a flat wire 131A having a cut 132 and a flat wire 131B having a cut 133 are stacked in parallel in the vertical direction. be able to.

  As shown in FIG. 12, the notch 142 does not necessarily have to be formed over the entire circumference of the flat wire 141. In other words, it may be formed on at least a part of the upper surface 143 and the lower surface 144 of the flat wire. Further, the notch 142 may not be parallel to the direction in which the flat wire 141 extends, and may be inclined at a predetermined angle so as not to be orthogonal to the same direction.

  As shown in FIG. 13, the cut 152A is formed from the end portion 151A of the flat wire 151 to the middle of the end portion 151B, and the cut 152B is formed from the end portion 151B of the flat wire 151 to the middle of the end portion 151A. can do.

  In the above embodiment, a sheet-like material is used as the magnetic body 42 of the secondary coil module 40, but a magnetic body having the same shape as the magnetic body 32 of the primary coil module 30 can also be used.

The flat wires 43A and 43B may be aluminum wires or an aluminum foil pattern or a copper foil pattern of a printed wiring board.
The number of rectangular wires constituting the collective conductive wire 43 can be three or more.

The winding direction of the collective conductive wire 43 of the first coil 50 and the second coil 60 can be changed to opposite directions.
In the above embodiment, a configuration is used in which the power and signals transmitted from the primary coil module 30 are received by the secondary coil module 40. However, this can be changed as follows. That is, a first secondary coil module 40A for receiving electric power and a second secondary coil module 40B for receiving signals can be provided. In this case, in the power transmission device 10, two primary coil modules 30A and 30B corresponding to the respective secondary coil modules 40A and 40B are provided.

  The power receiving device 20 shown in the above embodiment performs non-contact power transmission other than a mobile phone, such as a portable information terminal, a portable audio player, an IC recorder, a digital camera, an electric toothbrush, and a shaver. It can also be used for various electric devices. In this case, the size of the power transmission device 10 is changed to a size corresponding to these power reception devices.

  DESCRIPTION OF SYMBOLS 10 ... Power transmission apparatus, 20 ... Power reception apparatus, 40 ... Secondary side coil module (power reception coil module), 41 ... Secondary side coil (planar coil), 42 ... Magnetic body, 43 ... Collective conductive wire, 43A ... Rectangular wire ( Conductive wire), 43B ... flat wire (conductive wire), 45 ... cut, 46A ... upper surface, 46B ... upper surface, 47A ... lower surface, 47B ... lower surface, 50 ... first coil.

Claims (9)

In a planar coil formed by winding a rectangular wire with a rectangular cross section as a conductive wire in a planar shape,
The conductive coil is formed by forming a plurality of cuts extending in the extending direction on at least one of an upper surface and a lower surface of the conductive wire. The planar coil according to claim 1, wherein
A planar coil, wherein the conductive wires are aligned in parallel, and the collective conductive wires having their ends electrically connected are wound in a planar shape. The planar coil according to claim 2,
The planar coil, wherein the collective conductive wire is wound so that the positions of the conductive wire on the outer peripheral side and the conductive wire on the inner peripheral side are interchanged in the middle of the circumferential direction of the planar coil. In the planar coil as described in any one of Claims 1-3,
The planar coil, wherein the single conductive wire is folded halfway along the circumferential direction of the planar coil. 5. A planar coil according to claim 1, comprising a first coil and a second coil connected in series therewith, wherein the first coil and the second coil are laminated. The planar coil characterized by being made. The planar coil according to claim 5,
The planar coil, wherein the first coil and the second coil have their winding directions set in opposite directions. A coil module comprising a magnetic body for reducing leakage magnetic flux on at least one of the upper surface and the lower surface of the planar coil according to any one of claims 1 to 6. In the power receiving device of the non-contact power transmission device that receives the power transmitted from the power transmitting device by the power receiving coil module,
The coil module of Claim 7 is provided as said power receiving coil module. The power receiving apparatus of the non-contact-type power transmission device characterized by these. In a contactless power transmission device including a power transmission device and a power reception device,
The power receiving device according to claim 8 is provided as the power receiving device. A non-contact power transmission device.

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