TW201320121A - Planar coil, coil module including planar coil, power receiving device including planar coil, and contactless electric power transmission apparatus including planar coil - Google Patents

Abstract

A planar coil, a coil module including the planar coil, a power receiving device including the planar coil, and a contactless electric power transmission apparatus including the planar coil is for suppressing electricity to be lost. A secondary winding has a planar winding which has a first wire and a second wire and is winded in a plane, wherein the first wire and the second wire are flat wires 43A and 43B which have rectangle cross-section and include a plurality of slots which extending toward a stretching orientation of the flat wires 43A and 43B on these top surfaces 46A and 46B.

Description

Planar coil and coil module with same, power receiving device and contactless power Conveyor

The present invention relates to a planar coil wound in a planar shape of a wire having a rectangular cross section, a coil module including the same, a power receiving device, and a non-contact power transmission device.

At present, there has been proposed a non-contact power transmission device that can transmit power between two devices in a non-electrical contact state between the power transmitting device and the power receiving device. The power transmission of the non-contact power transmission device is performed by electromagnetic induction of a coil provided between both the power transmitting device and the power receiving device.

However, since many non-contact power transmission devices are required for miniaturization, coils provided in the power transmission device and the power receiving device are generally planar coils. For example, Patent Document 1 discloses that such a planar coil is obtained by arranging a plurality of circular wires having a circular cross section in parallel, and winding the obtained coil in a planar manner.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2010-16235

However, when a planar coil is formed by using a round wire as a wire, the ratio of the sectional area of the wire occupying the sectional area of the planar coil, that is, the space factor is lowered, because the gap area between the wires becomes large. As a result, heat is generated in the wires and the planar coils. In this regard, when a planar coil is formed by a square wire having a square cross section, it can be reduced as compared with the case where a circular coil is formed by a circular wire. The gap area between the fewer wires increases the space factor. However, for example, when a plurality of square wires are wound side by side to form a planar coil, the wire may be twisted due to separation of the wires, resulting in a decrease in productivity, and the space factor of the wire may be lowered more than in the case of a round wire.

On the other hand, if a rectangular line having a large cross-sectional area of a straight line is used, a planar coil having the same spatial coefficient can be formed with a smaller number of square lines. That is, the above productivity reduction can be suppressed. However, when a flat wire is used as such a wire, it is easy to generate a large eddy current due to the magnetic flux passing through the wire, and this is consumed as heat energy, and thus the eddy current loss tends to be large.

The present invention has been made to solve the above problems, and an object thereof is to provide a planar coil, a coil module including the same, a power receiving device, and a non-contact power transmission device, which can suppress eddy current loss.

The planar coil of the present invention comprises at least one wire having an upper surface and a lower surface, which are wound in a planar shape, the at least one wire having a rectangular cross section, and the at least one wire comprising a plurality of slits formed on the upper surface And at least one of the following, and extending toward the extending direction of the at least one wire.

Preferably, the planar coil is characterized in that the at least one wire is a first wire, and the planar coil further comprises a second wire having an upper surface and a lower surface, which are wound in a planar shape, and the second wire has a rectangular cross section The second wire includes a plurality of slits formed on at least one of the upper surface and the lower surface, and extending toward the extending direction of the at least one wire, wherein the first and second wires are arranged side by side to form a collecting wire and are wound in a planar shape. The ends of the first and second wires are electrically connected to each other.

In the planar coil, it is preferable that the above-mentioned collecting wire is wound into the above The position of the first wire and the position of the second wire are alternated with the middle of the collective wire along the outer circumferential direction of the planar coil.

Preferably, in the planar coil, the at least one wire is a single wire, and is folded back in the middle of the wire along the outer circumferential direction of the planar coil.

Preferably, in the planar coil, the planar coil includes a first coil and a second coil connected in series with the first coil, and the first coil and the second coil are laminated.

In the planar coil, it is preferable that the first coil system is formed along a winding direction that is opposite to a winding direction of the second coil.

The coil module of the present invention includes the above-described planar coil, and a magnetic body provided on at least one of the upper surface and the lower surface to reduce leakage magnetic flux.

The power receiving device of the non-contact power transmission device according to the present invention receives electric power transmitted from the power transmitting device by the power receiving coil module, and includes the coil module as the power receiving coil module.

A non-contact power transmission device according to the present invention includes a power transmission device and the power reception device.

According to the present invention, it is possible to provide a planar coil capable of suppressing eddy current loss, a coil module including the same, a power receiving device, and a non-contact power transmission device.

The overall configuration of the non-contact power transmission device of the present invention will be described with reference to Fig. 1 .

The non-contact power transmission device includes a power receiving device 20 in which the rechargeable battery 22 is mounted, and a power transmitting device 10 that transmits power to the power receiving device 20. figure 1 In the middle, the mobile phone is exemplified as the power receiving device 20.

The power transmitting device 10 includes a primary side coil module 30 that transmits power and signals to the power receiving device 20, and a casing 11 that houses various components such as the primary side coil module 30. The casing 11 includes a mounting surface 11A on which the power receiving device 20 is placed.

In the primary side coil module 30, a magnetic body 32 that suppresses leakage of magnetic flux generated by the primary side coil 31 is incorporated in the primary side coil 31 that generates magnetic flux by electric power supply. This magnetic body 32 has a bottom plate portion 32A that faces the bottom surface of the primary side coil 31, and a side wall portion 32B that surrounds the outer circumference of the primary side coil 31. The bottom plate portion 32A and the side wall portion 32B may be formed of a ferrite material.

The power receiving device 20 includes a secondary side coil module 40 that receives electric power and signals transmitted from the power transmitting device 10, and a casing 21 that houses the secondary side coil module 40, the rechargeable battery 22, and various components. Further, the secondary side coil module 40 corresponds to a "power receiving coil module".

In the secondary-side coil module 40, the magnetic body 42 that suppresses the leakage of the magnetic flux generated by the primary-side coil 31 is incorporated in the secondary-side coil 41 in which the current is generated by the magnetic flux generated by the primary-side coil 31.

The magnetic body 42 has a contact surface 42A that contacts the bottom surface of the secondary side coil 41. The outer diameter of the magnetic body 42 is set to be larger than the outer diameter of the secondary side coil 41. The magnetic body 42 can be exemplified by a sheet-like magnetic body formed of an amorphous material.

The power supply operation of the non-contact power transmission device will be described below.

When the power receiving device 20 is mounted on the mounting surface 11A of the power transmitting device 10, the primary side coil module 30 of the power transmitting device 10 and the secondary side coil module 40 of the power receiving device 20 face each other. In this state, an alternating current is supplied to the primary side coil 31, and a high frequency alternating magnetic flux is generated in the primary side coil 31. Then, the alternating magnetic flux is interlinked to the secondary side coil 41 and the alternating current is generated in the secondary side coil 41. force. This alternating electric power is rectified and smoothed by a rectifying circuit (not shown), and then supplied to the rechargeable battery 22.

The detailed configuration of the secondary side coil 41 will be described with reference to Fig. 2 . In the following description, the direction perpendicular to the center line C of the secondary side coil 41 is defined as "radial direction". In addition, the direction of the secondary side coil 41 in the radial direction toward the center line C is defined as "inside", and the direction in the radial direction away from the center line C is defined as "outside". Further, the direction in which the secondary side coil 41 is wound from the inside to the outside is defined as the winding direction.

The secondary side coil 41 is a planar coil including first and second wires. The first and second conductors have rectangular sections 43A and 43B having a rectangular cross section, and the planar coils are arranged in parallel to form the rectangular lines 43A and 43B, and the ends 51A and 51B and the end portions 61A and 61B are electrically connected to each other. The wire 43 is formed by winding in a planar shape. That is, the secondary side coil 41 has the first coil 50 wound by the collecting wire 43, is connected in series with the first coil 50, is laminated on the second coil 60 of the first coil 50, and is located at the first coil 50 and The splicing portion 44 at the junction of the two coils 60. The winding direction of the first coil 50 is set to be opposite to the winding direction of the second coil. That is, the secondary side coil 41 is formed by a so-called α-shaped winding.

The splicing portion 44 includes a folded portion 44A, and the position of the rectangular line 43A and the position of the rectangular line 43B alternate in the middle of the collective lead 43 along the outer circumferential direction of the secondary side coil 41. Among the collective wires 43 corresponding to the portion of the first coil 50, the rectangular line 43A is located farther from the center line than the flat line 43B. Here, due to the formation of the folded portion 44A, the flat line 43A is located closer to the center line C than the flat line 43B in the collective lead 43 corresponding to the second coil 60 portion.

The shape of the collecting wire 43 will be described in detail with reference to FIG.

The collecting wire 43 is composed of the rectangular wires 43A, 43B. Flat corner line 43A There is an upper 46A and a lower 47A, and a flat line 43B has an upper 46B and a lower 47B. The rectangular wires 43A and 43B are copper wires having a rectangular cross section. In the rectangular wires 43A, 43B, the upper faces 46A, 46B, the lower faces 47A, 47B, and the side faces are covered by a lacquer layer (not shown), and the lacquer layer is formed by a self-melting fused layer ( The illustration is omitted and covered. Therefore, the rectangular line 43A and the rectangular line 43B are self-melting by the fusion of the layers.

The upper faces 46A, 46B of the rectangular wires 43A, 43B form a plurality of slits 45 extending in the extending direction of the collecting wires 43. This slit 45 has mutually opposing slit faces 48A, 48B which are also covered with the lacquer layer in the same manner as the upper faces 46A, 46B. Therefore, the slit surface 48A is electrically insulated from the slit surface 48B.

In addition, the slit 45 does not reach the lower 47A, 47B. That is, the slit 45 does not penetrate the upper faces 46A, 46B and the lower faces 47A, 47B.

The eddy current generated in the collecting wire 43 will be described with reference to FIG.

As shown in Fig. 4 (a), the above-mentioned slits are not formed on the upper surfaces 72A, 72B and the lower surfaces 73A, 73B of the collective electric wires 71 composed of the conventional general rectangular wires 71A, 71B. Therefore, the magnetic flux B generated by the primary side coil 31 generates the eddy current W1 over a wide range by passing through the collecting wire 71.

On the other hand, as shown in FIG. 4(b), the magnetic flux B generated by the primary side coil 31 generates the eddy current W2 when it passes through the collecting wire 43. Here, since the collecting wire 43 is provided with the slit 45, the generation of the eddy current across the slit 45 is suppressed, and the portion where the eddy current W2 is generated is reduced. That is, in the collecting wire 43, the electrical impedance of the portion where the eddy current W2 flows is increased, and the eddy current W2 is generated as compared with the eddy current W1 generated by the collective wire 71 not formed with the slit shown in Fig. 4(a). Smaller.

Next, the "comparison coil 41X" will be described with reference to Fig. 5, that is, the folded portion is omitted from the secondary side coil 41 of the non-contact power transmission device of the present embodiment. The induced current generated in the secondary side coil obtained in 44A. In the following description of the comparison coil 41X, the same components as those of the secondary side coil 41 of the present embodiment are denoted by the same reference numerals. In addition, in order to simplify the configuration of the comparison coil 41X, the number of turns of the collecting wire 43 is changed from two turns to one turn.

Since the magnetic flux B generated by the primary side coil 31 passes through the vicinity of the center of the comparison coil 41X, a current IA flows through the collecting wire 43. On the other hand, since the magnetic flux Bc from the primary side coil 31 passes between the rectangular line 43A of the collecting wire 43 and the rectangular line 43B, an induced current ia flows through the rectangular line 43A, 43B. This induced current ia is a loop current that is swirled around the first coil 50 and the second coil 60, and hinders the flow of the current IA. As a result, an increase in power transmission loss due to the generation of the loop current cannot be avoided.

Next, the induced current generated in the secondary side coil 41 will be described with reference to Fig. 6 . In addition, in order to simplify the configuration of the secondary side coil 41, the number of turns of the collective wire 43 is changed from two turns to one turn, similarly to FIG.

Since the magnetic flux B generated by the primary side coil 31 passes near the center of the secondary side coil 41, a current IA flows through the collecting lead 43. On the other hand, since the magnetic flux Bc from the primary side coil 31 passes between the rectangular line 43A of the collecting wire 43 and the rectangular line 43B, an induced current ia may flow in the rectangular line 43A, 43B.

Here, when the first coil 50 is focused, the induced current ia flows toward the folded portion 44A of the connecting portion 44. On the other hand, when the second coil 60 is focused, the induced current ia is directed toward the folded portion of the connecting portion 44. 44A flows. That is, the induced current ia of the first coil 50 and the induced current ia of the second coil 60 cancel out due to the opposite flow directions. Therefore, the secondary side coil 41 does not generate such a loop current, or is compared with the loop flowing in the comparison coil 41X. Current, only a relatively small loop current flows. As a result, it is possible to suppress an increase in power transmission loss due to the occurrence of such a loop current, and it is possible to supply a large amount of electric power to the rechargeable battery 22.

(effect of the implementation type)

According to the non-contact power transmission device of the present embodiment, the following effects can be obtained.

(1) The secondary side coil 41 includes a planar coil in which the first and second leads are wound in a planar shape, and the first and second lead wires have rectangular cross-sections 43A and 43B having a rectangular cross section, and the rectangular wires 43A and 43B include a plurality of The slit 45 is formed on the upper faces 46A, 46B and extends in the extending direction of the rectangular wires 43A, 43B.

According to this configuration, since the first and second wires are the rectangular wires 43A and 43B, for example, the gap area existing between the wires is reduced as compared with the planar coil having the planar winding round wire. Therefore, it is possible to increase the ratio of the cross-sectional area of the wire occupying the cross-sectional area of the planar coil, that is, the space factor, and it is possible to suppress the heat generation of the secondary side coil 41.

Further, since the planar coils of the rectangular wires 43A and 43B are used, it is easy to generate a large eddy current on the wires when the magnetic flux passes through the wires, and this is consumed as thermal energy, and thus the eddy current loss tends to be large. However, in the present embodiment, since the upper faces 46A, 46B of the rectangular wires 43A, 43B form a plurality of slits 45 extending in the extending direction of the rectangular wires 43A, 43B, generation of eddy currents across the slits 45 is suppressed. The portion where the eddy current is generated is reduced. Therefore, the slit 45 is formed on the rectangular line as compared with the case where the rectangular line having no such slit 45 is used, whereby the generation of the eddy current can be suppressed, and the reduction of the eddy current loss as described above can be expected.

Further, the shape of the rectangular wires 43A and 43B is maintained by the portion where the slit 45 is not formed, and for example, in the case where the plurality of round wires or the square wires are wound side by side to form the secondary side coil 41, it is possible to prevent each of them from being formed. Flat corner line 43A, 43B The separation of the entire line of the coils is not possible, or the respective wires in the case of the square wires are twisted, so that the high production efficiency of the secondary side coils 41 can be maintained.

(2) In the secondary side coil 41, the collective conductive wires 43 including the rectangular lines 43A and 43B arranged side by side are wound in a planar shape, and the end portion 51A of the rectangular wire 43A is electrically connected to the end portion 51B of the rectangular wire 43B, and the flat angle is The end portion 61A of the wire 43A is electrically connected to the end portion 61B of the rectangular wire 43B. Therefore, the increase in the thickness of the secondary side coil 41 can be suppressed, and the number of turns required for the same secondary coil 41 can be secured.

(3) The collecting wire 43 includes the folded portion 44A, and the position of the rectangular wire 43A and the position of the rectangular wire 43B are alternated in the middle of the collective wire 43 along the outer circumferential direction of the secondary coil 41, thereby making the end The position of the rectangular line 43A of the portion 51A and the end portion 51B and the position of the rectangular line 43B alternate with the position of the rectangular line 43A of the end portion 61A and the end portion 61B and the position of the rectangular line 43B. The rectangular line 43A of the end portion 51A is located away from the center line C compared to the rectangular line 43B of the end portion 51B.

If the magnetic flux passes between the rectangular line 43A and the rectangular line 43B constituting the collecting wire 43, the magnetic flux will generate an induced current at the rectangular wires 43A, 43B. In this regard, according to the present embodiment, the position of the angled line 43A of the end portion 51A of the collecting lead 43 and the end portion 51B and the position of the flat line 43B alternate between the end portion 61A and the end portion 61B of the collecting lead 43. Therefore, generation of a loop current that induces an induced current that is swirled on the rectangular wires 43A and 43B of the secondary side coil 41 can be suppressed, and an increase in power transmission loss due to the occurrence of such a loop current can be further suppressed.

(4) The secondary side coil 41 includes the first coil 50 and the second coil 60 connected in series to the first coil 50, and the first coil 50 and the second coil 60 are laminated. Therefore, the increase in the radial thickness of the secondary side coil 41 can be suppressed, and the number of turns required for the secondary side coil 41 can be ensured.

(5) The first coil 50 has a winding direction opposite to the second coil 60. Therefore, the winding direction of the collecting wire 43 is different from that of the normal, and the secondary side coil 41 is formed by a so-called α-shaped winding, so that the end portions 51A, 51B and 61A, 61B of the collecting wire 43 do not have to be wound from the secondary side. The inner diameter portion of 41 is taken out. Therefore, it is possible to suppress the increase in the thickness of the secondary side coil caused by the end portions 51A and 51B and the end portions 61A and 61B of the rectangular wires 43A and 43B being drawn from the inner diameter portion of the secondary side coil 41.

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

(other implementation types)

The embodiment of the present invention is not limited to the above-described embodiments, and may be modified as shown below, for example. In addition, the following modifications are not only applicable to the above-described embodiment, but may be implemented by combining different variations.

As shown in FIG. 7, in the secondary side coil 41, the folded portion 44A may be omitted by the joint portion 44 of the boundary portion between the first coil 50 and the second coil 60. At this time, in the collective conductive line 43 of both the first coil 50 and the second coil 60, the rectangular line 43A is located away from the center of the secondary side coil 41 as compared with the rectangular line 43B. Even in such a configuration, the effects similar to the above (1), (2), and (4) to (6) can be exhibited.

In order to suppress the loop current which is swirled on the rectangular lines 43A, 43B, in other words, in order to effectively cancel the induced current flowing through the rectangular lines 43A, 43B, as in the above-described embodiment, the position of the flat line 43A and the flat line 43B are generally The position is preferably alternated between the splicing portions 44 at the center positions of the collective wires 43 constituting the secondary side coils 41. However, the position of the rectangular line 43A and the rectangular line 43B may also alternate between the first coil 50 or the second coil 60.

The ̇ secondary side coil 41 can also be formed by winding a single rectangular wire 43A in a planar shape and returning to the rectangular wire 43A at the middle of the diagonal line 43A along the outer circumferential direction of the secondary side coil 41. Since the rectangular line 43A has a plurality of slits 45 on the upper surface 46A and is similar to the configuration of the collecting lead 43, the effect of the above (3) can be exhibited. Further, at this time, the plurality of slits 45 are preferably formed on the entire circumference of the flat line 43A at least one of the upper surface 46A and the lower surface 47A of the single rectangular line 43A. Further, the folding back means that the upper surface 46A of the rectangular line 43A and the lower surface 47A are alternately folded back.

As shown in FIG. 8, a rectangular wire 80 having a slit 81 can be wound to constitute the secondary side coil 90.

As shown in FIG. 9, the collecting wire 101 composed of two diagonal lines 101A, 101B having slits 103 and side by side can be wound, and the secondary side coil 110 is constituted by only one layer. At this time, the position of the rectangular line 101A and the position of the rectangular line 101B are alternated with the intermediate portion 102 of the rectangular lines 101A, 101B along the outer circumferential direction of the secondary side coil 110. Even with such a configuration, the generation of the loop current as described above can be suppressed.

As shown in FIG. 10, a slit 124 may be provided on both sides 122A and 122B of the collective wire 121 and the lower faces 123A and 123B formed by the rectangular line 121A and the rectangular line 121B.

As shown in FIG. 11, the rectangular wire 131A having the slit 132 and the rectangular wire 131B having the slit 133 may be vertically stacked side by side to obtain a collecting wire 131, and wound to form a secondary side coil.

As shown in FIG. 12, the slit 142 is not formed on the entire circumference of the rectangular line 141. That is, at least a portion of the upper surface 143 and the lower surface 144 of the rectangular line may be formed. Further, the slit 142 may be formed not to be parallel to the extending direction of the rectangular line 141, and may be formed to be inclined by a predetermined angle with respect to the same direction so as not to be perpendicular to the same direction.

As shown in FIG. 13, a slit 152A may be formed from the end portion 151A of the rectangular wire 151 to a position close to but not the end portion 151B, and from the end portion 151B of the rectangular wire 151 to the position close to but not the end portion 151A. A slit 152B is formed.

In the above embodiment, the magnetic body 42 of the secondary side coil module 40 is a flat magnetic body. However, a magnetic body having the same shape as the magnetic body 32 of the primary side coil module 30 may be used.

The ̇ angled lines 43A, 43B may be aluminum foil patterns or copper foil patterns of aluminum wires or printed circuit boards.

The number of the square lines constituting the collecting wire 43 may be three or more.

The winding directions of the collective wires 43 of the first coil 50 and the second coil 60 may be changed to opposite directions, respectively.

In the above embodiment, the secondary side coil module 40 is configured to receive the electric power and the signal transmitted from the primary side coil module 30. However, this may be changed as follows. That is, a first secondary side coil module 40A for receiving electric power and a second secondary side coil module 40B for receiving signals may be provided. At this time, the power transmitting device 10 can be provided with the first and second primary coil modules 30A and 30B corresponding to the first and second secondary coil modules 40A and 40B, respectively.

The power receiving device 20 shown in the above embodiment can be used for other non-contact mobile information terminals, portable audio devices, IC recorders, digital cameras, electric toothbrushes, razors, etc., in addition to mobile phones. Various types of electrical appliances for power transmission. At this time, the size of the power transmitting device 10 can be changed in accordance with the size of some of the power receiving devices.

10‧‧‧Power transmission device

11‧‧‧Shell

11A‧‧‧Jacketing surface

20‧‧‧Power-receiving device

21‧‧‧ housing

22‧‧‧Rechargeable battery

30‧‧‧One-side coil module

31‧‧‧One-side coil

32‧‧‧Magnetic body

32A‧‧‧Bottom plate section

32B‧‧‧ Sidewall section

40‧‧‧Secondary coil module

41‧‧‧second side coil

41X‧‧‧Comparative coil

42‧‧‧ magnetic body

42A‧‧‧Contact surface

43‧‧‧Collected wire

43A‧‧ ‧ corner line

43B‧‧‧Kitchen line

44‧‧‧Continuous part

44A‧‧‧Departure

45‧‧‧ slitting

46A‧‧‧above

46B‧‧‧above

47A‧‧‧Under

47B‧‧‧ below

48A‧‧‧Slit surface

48B‧‧‧Slit surface

50‧‧‧First coil

51A‧‧‧End

51B‧‧‧End

60‧‧‧second coil

61A‧‧‧End

61B‧‧‧End

71‧‧‧Set wire

71A‧‧ ‧ corner line

71B‧‧‧Kitchen line

72A‧‧‧above

72B‧‧‧above

73A‧‧‧ below

73B‧‧‧ below

80‧‧‧Kitchen line

81‧‧‧ slitting

90‧‧‧second side coil

101‧‧‧Set wire

101A‧‧ ‧ corner line

101B‧‧ ‧ corner line

102‧‧‧ middle part

103‧‧‧ slitting

110‧‧‧second side coil

121‧‧‧Collected wire

121A‧‧‧Kitchen line

121B‧‧‧Kitchen line

122A‧‧‧above

122B‧‧‧above

123A‧‧‧ below

123B‧‧‧ below

124‧‧‧ slitting

131‧‧‧Set wire

131A‧‧‧Kitchen line

131B‧‧‧Kitchen line

132‧‧‧ slitting

141‧‧ ‧ corner line

142‧‧‧ slitting

143‧‧‧above

144‧‧‧ below

151‧‧ ‧ corner line

151A‧‧‧End

151B‧‧‧End

152A‧‧‧ slitting

152B‧‧‧ slitting

B‧‧‧Magnetic

W1‧‧‧ eddy current

W2‧‧‧ eddy current

1 is a view showing a non-contact power transmission device according to an embodiment of the present invention. Set the profile.

Fig. 2 is a perspective view showing a secondary side coil according to an embodiment of the present invention.

Fig. 3 is an enlarged perspective view showing the X area of Fig. 2 according to an embodiment of the present invention.

Fig. 4 (a) is a perspective view showing a conventional rectangular line, and Fig. 4 (b) is a perspective view showing a rectangular line used in the present embodiment.

Fig. 5 is a schematic diagram showing an equivalent circuit of a secondary side coil in the non-contact power transmission device of the comparative example.

Fig. 6 is a schematic diagram showing an equivalent circuit of a secondary side coil in the non-contact power transmission device of the present embodiment.

Fig. 7 is a perspective view showing a secondary side coil in a non-contact power transmission device according to another embodiment of the present invention.

Fig. 8 is a plan view showing a planar coil in a non-contact power transmission device according to another embodiment of the present invention.

Fig. 9 is a plan view showing a planar coil in a non-contact power transmission device according to another embodiment of the present invention.

Fig. 10 is a perspective view showing a rectangular line in a non-contact power transmission device according to another embodiment of the present invention.

Fig. 11 is a perspective view showing a rectangular line in a non-contact power transmission device according to another embodiment of the present invention.

Fig. 12 is a perspective view showing a rectangular line in a non-contact power transmission device according to another embodiment of the present invention.

Fig. 13 is a perspective view showing a rectangular line in a non-contact power transmission device according to another embodiment of the present invention.

43‧‧‧Collected wire

43A‧‧ ‧ corner line

43B‧‧‧Kitchen line

45‧‧‧ slitting

46A‧‧‧above

46B‧‧‧above

47A‧‧‧Under

47B‧‧‧ below

48A‧‧‧Slit surface

48B‧‧‧Slit surface

51A‧‧‧End

51B‧‧‧End

Claims (11)

A planar coil having at least one wire having an upper surface and a lower surface and wound in a planar shape, wherein the at least one wire has a rectangular cross section, and the at least one wire comprises a plurality of slits formed on the upper surface and the lower surface And extending toward the extending direction of the at least one wire. The planar coil according to claim 1, wherein the at least one wire is a first wire, and the planar coil further comprises a second wire having an upper surface and a lower surface, which are wound in a planar shape, wherein the second wire has a rectangular line having a rectangular cross section, wherein the second wire comprises a plurality of slits formed on at least one of the upper surface and the lower surface, and extending toward the extending direction of the at least one wire, the first and second wires are arranged side by side to form a collecting wire and a plane Winding, the first and second wires are electrically connected to each other at their ends. The planar coil of claim 2, wherein the set conductor is wound into a position of the first wire and a position of the second wire, alternating with a middle of a collecting wire along an outer circumferential direction of the planar coil . The planar coil of claim 1, wherein the at least one wire is a single wire that is folded back in the middle of the wire along the outer circumferential direction of the planar coil. The planar coil according to any one of claims 1 to 4, wherein the planar coil comprises: a first coil; and a second coil connected in series with the first coil, wherein the first coil and the second coil are laminated Configuration. The planar coil according to claim 5, wherein the first coil is formed along a winding direction opposite to a winding direction of the second coil. The planar coil according to any one of claims 1 to 4, wherein the at least one wire comprises: a first portion formed as a first coil; and a second portion formed as a second coil, the A coil is laminated with the second coil described above. The planar coil of claim 2, wherein the collective conductor comprises: a first portion formed as a first coil; and a second portion formed as a second coil, the first coil and the The second coil is laminated. A coil module comprising: the planar coil according to any one of claims 1 to 4; and a magnetic body for reducing leakage flux, which is provided on at least one of the above surface and the lower surface. A power receiving device for a non-contact power transmission device, wherein the power receiving coil module receives power transmitted by the power transmitting device, and the coil module according to claim 9 is provided as the power receiving coil module. A non-contact power transmission device comprising: a power transmission device; and the power receiving device according to claim 10 of the patent application.