JP2018074053A - Coil unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil unit that is able to increase an amount of magnetic flux entering a ferrite plate, while restricting an increase in the size of a coil unit.SOLUTION: A coil unit 3 comprises: a ferrite plate-like part 71 including: a flat plate part having a first main surface 70a and a second main surface 70b aligned in a thickness direction, and a projecting part; a power transmission coil 12 formed so as to surround the periphery of a winding shaft extending in the thickness direction of the ferrite plate 71 and arranged on a first main surface 70a side; and a shield member 60 disposed on the second main surface 70b. As viewed from the thickness direction, the second main surface 70b includes: an outer peripheral part located further outside than a coil 12; and an exposure part R1 located near the outer peripheral part and exposed from the shield member 60. The projecting part 72 is provided on the exposure part R1 so as to project further outward than the shield member 60.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a coil unit including a ferrite plate and a coil, and more particularly to a coil unit used in a non-contact charging system.

  Conventionally, various types of non-contact charging systems have been proposed (Patent Documents 1 to 5). And as a literature by which the conventional coil unit was disclosed, JP, 2006-103589, A (patent documents 6) is mentioned, for example.

  In the power receiving device and the power transmitting device disclosed in Patent Document 6, a step portion is provided on the shield member that shields the electromagnetic wave generated by the coil so as to be away from the ferrite plate. Thereby, the outer peripheral side of the ferrite is exposed to the space in the coil unit, and the magnetic flux can be drawn into the ferrite plate from the outer peripheral side of the exposed ferrite. As a result, the magnetic flux from the coil can be prevented from interlinking with the shield member, and eddy current loss can be reduced.

JP2013-154815A JP2013-146154A JP2013-146148A JP 2013-110822 A JP 2013-126327 A Japanese Patent Laid-Open No. 2006-103589

  However, in the coil unit disclosed in Patent Document 6, unless the stepped portion is increased, the leakage magnetic flux that enters the arc shape cannot be guided to the outer peripheral side of the exposed ferrite plate. When the stepped portion is enlarged, the housing that accommodates the coil, the ferrite plate, the shield member, and the like becomes large, and the coil unit becomes large.

  The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a coil unit that can increase the amount of magnetic flux entering the ferrite plate while suppressing an increase in the size of the coil unit. It is to provide.

  The coil unit includes a ferrite plate including a flat plate portion having a first main surface and a second main surface arranged in the thickness direction, and a protrusion, and a periphery of a winding shaft extending in the thickness direction of the ferrite plate. A coil disposed on the first main surface side and a shield member disposed on the second main surface, and the second main surface is viewed from the thickness direction. The outer peripheral portion located outside the coil and an exposed portion located near the outer peripheral portion and exposed from the shield member, and the protruding portion is thicker than the shield member. It is provided in the said exposed part so that it may protrude in the direction.

  According to the above coil unit, the ferrite plate has the protruding portion that protrudes outward from the shield member at a position near the outer peripheral portion of the second main surface located outside the coil, so that the ferrite plate is generated by the coil. Magnetic flux that tends to wrap around the second main surface side of the plate can be captured by the protrusion. As a result, the amount of magnetic flux entering the ferrite plate can be increased. Further, by utilizing the internal space of the coil unit located around the ferrite plate and having a certain size, and arranging the protruding portion in this internal space, it is possible to suppress the coil unit from becoming large.

  According to the present disclosure, it is possible to provide a coil unit that can increase the amount of magnetic flux entering the ferrite plate while suppressing the coil unit from becoming large.

1 is a schematic diagram showing a non-contact charging system according to Embodiment 1. FIG. 1 is an electric circuit diagram showing a non-contact charging system according to Embodiment 1. FIG. 2 is an exploded perspective view showing a coil unit according to Embodiment 1. FIG. 4 is a diagram illustrating an example of magnetic flux in the coil unit according to Embodiment 1. FIG. It is a figure which shows an example of the magnetic flux in the coil unit which concerns on a comparative example. 6 is an exploded perspective view showing a coil unit according to Embodiment 2. FIG. It is a figure which shows an example of the magnetic flux in the coil unit which concerns on Embodiment 2. FIG. 6 is an exploded perspective view showing a coil unit according to Embodiment 3. FIG. 6 is a perspective view showing a part of a ferrite plate according to Embodiment 3. FIG. It is sectional drawing along the XX line shown in FIG. 6 is a diagram illustrating an example of magnetic flux in a coil unit according to Embodiment 3. FIG.

  Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic diagram illustrating a contactless charging system according to Embodiment 1. FIG. FIG. 2 is an electric circuit diagram illustrating the contactless charging system according to the first embodiment. With reference to FIG. 1 and FIG. 2, the non-contact charge system which concerns on Embodiment 1 is demonstrated.

  In FIG. 1, an arrow U indicates an upward direction in the direction of gravity, and an arrow D indicates a downward direction in the direction of gravity. Arrows L and R indicate the vehicle width direction of the vehicle 2, and arrows F and B indicate the vehicle longitudinal direction of the vehicle 2. The significance of these arrows is the same in FIG.

  As shown in FIGS. 1 and 2, the non-contact charging system 1 includes a vehicle 2 and a coil unit 3. The vehicle 2 is equipped with a coil unit 4 and a battery 7, and the coil unit 4 is provided on the lower surface of the floor panel 15 of the vehicle 2. The coil unit 3 is provided on the ground, which is outside the vehicle 2, and the coil unit 4 receives electric power from the coil unit 3 in a non-contact manner.

  The coil unit 4 includes a resonator 5 and a rectifier 6. The resonator 5 includes a power receiving coil 8 and a capacitor 9, and an LC resonance circuit is formed by the power receiving coil 8 and the capacitor 9. The rectifier 6 is connected to the resonator 5, converts AC power received by the resonator 5 into DC power, and supplies the DC power to the battery 7.

  The coil unit 3 includes a resonator 14 and a converter 11. The resonator 14 includes a power transmission coil 12 and a capacitor 13, and an LC resonance circuit is formed by the power transmission coil 12 and the capacitor 13. The converter 11 is connected to the power supply 10, adjusts the frequency of the alternating current supplied from the power supply 10, adjusts the voltage, and supplies the adjusted voltage to the resonator 14.

  FIG. 3 is an exploded perspective view showing the coil unit according to the first embodiment. A coil unit according to Embodiment 2 will be described with reference to FIG.

  As shown in FIG. 3, the coil unit 4 includes a housing case 20, a power receiving coil 8, a bobbin 80, a ferrite plate 70, a shield member 60, a substrate 50, and a plurality of bolts 25. The housing case 20 includes a case body 30 and a resin lid 40, and the power receiving coil 8, bobbin 80, ferrite plate 70, shield member 60, and substrate 50 are housed in the housing case 20.

  The case main body 30 is a member that is fixed to the lower surface of the floor panel 15 (FIG. 1) by using a plurality of bolts 25. The case body 30 is made of, for example, aluminum or an aluminum alloy.

  The case main body 30 includes a base portion 31, a peripheral wall portion 32, and a plurality of support walls 37 (see FIG. 4). The base part 31 has a substantially flat plate shape. The plurality of support walls 37 are provided on the lower surface side of the base portion 31. The plurality of support walls 37 support the shield member 60.

  A plurality of fixing portions 33 </ b> A to 33 </ b> F projecting outward in the vehicle width direction are formed on the peripheral wall portion 32 of the portion facing in the vehicle width direction L and R. The fixing portions 33A to 33F have through holes 34A to 34F, respectively.

  The fixing portions 33A to 33F are fixed to the floor panel 15 by fastening the bolts 25 inserted through the through holes 34A to 34F to the lower surface of the floor panel 15 of the vehicle 2.

  In addition to the fixing portions 33A to 33F, the peripheral wall portion 32 of the case body 30 is also provided with a plurality of overhang portions 35T. The plurality of overhang portions 35T are arranged so as to be spaced from each other in the circumferential direction of the peripheral wall portion 32. The plurality of overhang portions 35T are disposed so as to surround the periphery of the peripheral wall portion 32. The plurality of overhang portions 35T correspond to the plurality of overhang portions 44T provided in the resin lid 40.

  The resin lid 40 has a box shape that opens toward the case body 30 side. The resin lid 40 covers the case body 30 from below. The resin lid 40 includes a base portion 41, an annular wall portion 42, and a flange portion 43. The base part 41 has a substantially flat plate shape. The annular wall portion 42 is provided so as to stand up from the peripheral edge of the base portion 41. The flange portion 43 is provided so as to protrude outward in the circumferential direction of the base portion 41 from the upper end of the annular wall portion 42.

  The flange portion 43 is provided with a plurality of overhang portions 44T. A positioning pin 45B is provided in each of the plurality of overhang portions 44T. The resin lid 40 is fastened to the case body 30 by screws or the like (not shown) in a state where the positioning pins 45B are fitted in the overhang portions 35T provided on the case body 30. Instead of using the positioning pin 45B, the resin lid 40 and the case main body 30 may be directly fastened to each other using a bolt that penetrates the overhanging portion 44T.

  The substrate 50 is fixed to the lower surface side of the case body 30, and electrical elements that perform power conversion, low-voltage control, and the like such as the capacitor 9 and the rectifier 6 are mounted on the surface of the substrate 50. The substrate 50 is provided with a slit. For example, a support wall 37 (see FIG. 4) provided in the case body passes through the slit.

  The ferrite plate 70 is disposed between the power receiving coil 8 and the shield member 60. A hollow portion is formed in the central portion of the ferrite plate 70. Ferrite plate 70 includes a plurality of corners 73. A notch 74 is formed in a side portion of the ferrite plate 70 located between the corner portions 73 adjacent to each other.

  Ferrite plate 70 includes a flat plate portion and a protruding portion. The flat plate portion is configured by a plate-like portion 71 included in each of a plurality of divided ferrites 70F described later. The protrusion is configured by a protrusion 72 included in each of a plurality of divided ferrites 70F described later.

  The flat plate portion has a first main surface 70a and a second main surface 70b when viewed from the thickness direction. The thickness direction is parallel to a winding axis O1 of a power receiving coil 8 described later.

  The first main surface 70 a is a surface facing the power receiving coil 8. The second main surface 70 b is a surface facing the shield member 60. The second main surface 70b, when viewed from the thickness direction of the flat plate portion, is an outer peripheral portion located outside the power receiving coil 8 and an exposed portion R1 that is located on the outer peripheral portion and exposed from the shield member 60 (see FIG. 4).

  The ferrite plate 70 includes a plurality of divided ferrites 70F. Each of the plurality of divided ferrites 70 </ b> F has a plate-like portion 71 and a protruding portion 72. The plate-like portion 71 is formed so as to extend in the radial direction of the power receiving coil 8 from the hollow portion. Each of the surfaces of the plurality of plate-like portions 71 facing the base portion 41 of the resin lid 40 is located on substantially the same plane.

  The protrusion 72 is provided on the exposed portion R1 (see FIG. 4). Specifically, the protrusion 72 is provided at the end of the plate-like portion 71 located between the corner 73 and the notch 74.

  The protrusion 72 protrudes outward from the shield member 60 (specifically, the thickness direction of the ferrite plate 70). The protruding portion 72 protrudes toward the side where the shield member 60 is located with respect to the plate-like portion 71. The protruding portion 72 protrudes toward the base portion 41 of the resin lid 40. The tip of the protrusion 72 is located at the same height as the surface of the shield member 60 located on the opposite side of the surface facing the power receiving coil 8 or on the base 41 side of the resin lid 40 from that position. The thickness of the protrusion 72 along the winding axis O1 is thicker than the thickness of the plate-like part 71 along the winding axis O1.

  The shield member 60 is disposed on the lower surface side of the substrate 50. The shield member 60 is disposed on the second main surface 70b of the flat plate portion. The central part of the shield member 60 protrudes on the side opposite to the side where the substrate 50 is located. The shield member 60 is made of, for example, aluminum or an aluminum alloy.

  The bobbin 80 has main surfaces 81 and 82 that face each other. The main surface 81 faces the shield member 60. The main surface 81 is provided with ribs 83 that define accommodating portions 84 for accommodating the plurality of divided ferrites 70F. Thereby, the bobbin 80 covers the plurality of divided ferrites 70F from the side opposite to the side where the substrate 50 is located with respect to the shield member 60.

  The main surface 82 faces the base portion 41 of the resin lid 40. The main surface 82 has a coil groove 85 for accommodating the power receiving coil 8.

  The power receiving coil 8 is disposed in the coil groove 85. The power receiving coil 8 is formed in an annular shape so as to surround the periphery of the winding axis O1, and in the example shown in FIG. 3, the winding axis O1 extends in the vertical direction. The power receiving coil 8 is a so-called spiral coil, and an opening 8R is formed at the center.

  The coil unit 4 as the power receiving device is configured as described above, and the power receiving coil 8, the bobbin 80, the ferrite plate 70, the shield member 60, and the substrate 50 are accommodated in the accommodation case 20.

  FIG. 4 is a diagram illustrating an example of magnetic flux in the coil unit according to the first embodiment. In FIG. 4, the coil unit 3 as a power transmission apparatus is shown. The coil unit 3 has substantially the same configuration as the configuration obtained by inverting the coil unit 4 in the vertical direction. For this reason, in the coil unit 3 shown in FIG. 4, the same code | symbol is attached | subjected about the part which is the same as that of the coil unit 4, or is common.

  Here, in the non-contact charging system 1, when power is supplied from the coil unit 3 to the coil unit 4, AC power is supplied to the power transmission coil 12, and a lot of magnetic flux is formed around the power transmission coil 12. . A part of this magnetic flux is linked to the receiving coil 8, so that an induced electromotive voltage is generated in the receiving coil 8. As a result, AC power is supplied from the power transmission coil 12 to the power receiving coil 8 by the alternating current flowing through the power receiving coil 8.

  As shown in FIG. 4, as a part of the magnetic flux generated in the power transmission coil 12, there is a magnetic flux MF that enters the ferrite plate 70 from the side surface side of the ferrite plate 70. For example, the magnetic flux MF tends to go around to the second main surface 70b side of the flat plate portion. That is, the magnetic flux MF enters between the shield member 60 and the base portion 31 of the case body 30.

  Since the protrusion 72 is formed at the end of the ferrite plate 70 as described above, the magnetic flux MF as described above can be captured by the protrusion 72 and guided into the ferrite plate 70. As a result, the amount of magnetic flux entering the ferrite plate 70 can be increased.

  In addition, since the protrusion 72 is disposed in the inner space of the coil unit that is set around the ferrite plate 70 and has a certain size, a space for providing the protrusion 72 is provided. It does not have to be newly formed. Thereby, it can suppress that a coil unit becomes tall and becomes large.

(Comparative example)
FIG. 5 is a diagram illustrating an example of magnetic flux in the coil unit according to the comparative example. The coil unit 3X according to the comparative example will be described with reference to FIG.

  As shown in FIG. 5, the coil unit 3 </ b> X has a different configuration of the ferrite plate 70 </ b> X when compared with the coil unit 4 according to the first embodiment. Other configurations are almost the same.

  The ferrite plate 70X is configured in a flat plate shape. The ferrite plate 70X is not provided with the protrusion 72 according to the first embodiment.

  In this case, the magnetic flux MF that wraps around the lower side of the shield member 60 cannot be drawn into the ferrite plate 70X. For this reason, the magnetic flux MF that wraps around the second main surface 70b side of the flat plate portion is easily interrupted by the shield member 60, and the coupling coefficient decreases.

(Embodiment 2)
FIG. 6 is an exploded perspective view showing the coil unit according to the second embodiment. In FIG. 6, a substrate on which electronic components are mounted is omitted, and a power device accommodated in a second accommodating portion 20 b described later is omitted. A coil unit 4A according to the second embodiment will be described with reference to FIG.

  As shown in FIG. 6, the coil unit 4A is different from the coil unit 4 according to Embodiment 1 in the configuration of the housing case 20A and the configuration of the ferrite plate 70A. Other configurations are almost the same.

  The housing case 20A is composed of a case body 30A and a resin lid 40A. The housing case 20A has a first housing portion 20a (see FIG. 7) described later and a second housing portion 20b (see FIG. 8) described later. The housing case 20A houses the case main body 30A, the shield member 60, the ferrite plate 70A, the bobbin 80, the power receiving coil 8, and the resin lid 40A.

  The case main body 30A has a box shape opening to the resin lid 40A side. The case main body 30A includes a first case portion 30A1 and a second case portion 30A2. 1st case part 30A1 and 2nd case part 30A2 are arrange | positioned along with the front-back direction of a vehicle, for example.

  The resin lid 40A has a box shape that opens toward the case body 30A. The resin lid 40A includes a first lid portion 40A1 and a second lid portion 40A2. The first lid part 40A1 and the second lid part 40A2 are arranged side by side in the front-rear direction of the vehicle, for example. The first lid portion 40A1 is provided so as to correspond to the first case portion 30A1. The second lid portion 40A2 is provided so as to correspond to the second case portion 30A2.

  A first accommodating portion 20a is formed between the first case portion 30A1 and the first lid portion 40A1. The first housing portion 20a mainly houses the power receiving coil 8, the bobbin 80, the ferrite plate 70A, and the shield member 60.

  A second accommodating portion 20b is formed between the second case portion 30A2 and a second shield member 68 described later. The second lid portion 40A2 covers the second shield member 68 from the lower side. The second storage unit 20b mainly stores power equipment including a rectifier that converts alternating current into direct current, an inverter that changes power from the rectifier into alternating current power, a filter that removes high-frequency noise, and the like.

  The ferrite plate 70A has a plurality of divided ferrites 70F1 and 70F2. In the ferrite plate 70A, the protrusions 72 are provided on the two divided ferrites 70F2 located on the second accommodating portion 20b side, and the protrusions 72 are not provided on the other divided ferrites 70F1.

  In the second embodiment, the flat plate portion of the ferrite plate 70 is constituted by the plate-like portion 71 included in each of the plurality of divided ferrites 70F1 and 70F2, and the protruding portion is constituted by the protruding portions 72 of the two divided ferrites 70F2. Is done.

  Also in this case, the protrusion 72 is formed on the exposed portion R1 (see FIG. 7) of the second main surface 70b of the flat plate portion exposed from the shield member 60 when viewed from the thickness direction of the flat plate portion. Is provided. The exposed portion R1 is located on the outer peripheral portion of the second main surface 70b located outside the power receiving coil 8 when viewed from the thickness direction. The protruding portion 72 protrudes outward of the flat plate portion from the shield member 60.

  In addition, since the structure of the bobbin 80, the receiving coil 8, and the shield member 60 is the same as that of the structure in Embodiment 1, it abbreviate | omits about the description.

  FIG. 7 is a diagram illustrating an example of magnetic flux in the coil unit according to the second embodiment. With reference to FIG. 7, an example of the magnetic flux in the coil unit 3A according to the second embodiment will be described.

  The coil unit 3A has substantially the same configuration as the configuration in which the coil unit 4A is inverted in the vertical direction. For this reason, in the coil unit 3A shown in FIG. 7, the same code | symbol is attached | subjected about the part which is the same as the coil unit 4A, or is common.

  As shown in FIG. 7, as a part of the magnetic flux generated by the power transmission coil 12, there are magnetic fluxes MF <b> 11, MF <b> 21, MF <b> 31 and MF <b> 12, MF <b> 22, MF <b> 32 that wrap around the side surface of the ferrite plate 70.

  Magnetic fluxes MF11, MF21, and MF31 are formed by the power transmission coil 12 on the front side of the vehicle. Magnetic fluxes MF12, MF22, and MF32 are formed on the rear side of the vehicle by the power transmission coil 12. The magnetic fluxes MF12, MF22, and MF32 are in a positional relationship corresponding to the magnetic fluxes MF11, MF21, and MF31.

  Focusing on the magnetic fluxes MF11, MF21, and MF31 on the front side of the vehicle, the magnetic flux MF11 spreads to the front side of the vehicle most. The magnetic flux MF11 enters the ferrite plate 70 from the side surface into the ferrite plate 70 on the vehicle front side. The magnetic flux MF21 is located between the magnetic flux MF11 and the magnetic flux MF31. The magnetic flux MF21 enters the ferrite plate 70 from the side surface to the ferrite plate 70 on the vehicle front side. The magnetic flux MF31 is located closest to the ferrite plate 70 side. The magnetic flux MF31 goes around to the second main surface 70b side of the flat plate portion without entering the ferrite plate 70 (divided ferrite 70F1).

  Since the 2nd accommodating part 20b containing the 2nd shield member 68 is provided in the back side of a vehicle, the state of magnetic flux differs compared with the front side of a vehicle.

  Specifically, paying attention to the magnetic fluxes MF12, MF22, and MF32, the magnetic flux MF12 spreads to the rearmost side of the vehicle. The magnetic flux MF12 is reflected by the second shield member 68 on the vehicle rear side and is not captured by the ferrite plate 70 (divided ferrite 70F2). The magnetic flux MF22 is located between the magnetic flux MF12 and the magnetic flux MF32. Similarly to the magnetic flux MF12, the magnetic flux MF22 is reflected by the second shield member 68 and is not captured by the ferrite plate 70 (divided ferrite 70F2). The magnetic flux MF32 tends to go around to the second main surface 70b side of the flat plate portion. That is, the magnetic flux MMF 32 tends to enter between the shield member 60 and the base portion 31 of the case body 30.

  On the second housing portion 20b side in which the power device is housed, since the projection 72 is formed at the end of the divided ferrite 70F2, the magnetic flux MF32 is captured by the projection 72, and the ferrite plate 70 (divided ferrite 70F2). You can lure inside.

  As described above, in the second embodiment, the second housing portion 20b including the second shield member 68 is disposed adjacent to the first housing portion 20a that houses a coil or the like. Even when it is difficult for the magnetic flux to enter the ferrite plate 70A from the side, the split ferrite 70F2 having the projection 72 is disposed on the side where the second housing portion 20b is located, so that the projection 72 Part of the magnetic flux that is about to enter between the shield member 60 and the base portion 31 of the case main body 30 can be drawn into the split ferrite 70F2. As a result, the amount of magnetic flux entering the ferrite plate 70A can be increased. As a result, it is possible to reduce a partial decrease in coupling constant resulting from the asymmetry of the structure of the coil unit 3A on the front side and the rear side of the vehicle.

  In addition, since the protrusion part 72 is arrange | positioned in the inner space of the coil unit previously set so that it may be located around a ferrite plate and may have a fixed magnitude | size, the space for providing the protrusion part 72 is newly provided. It does not have to be formed. Thereby, it can suppress that a coil unit becomes tall and becomes large.

(Embodiment 3)
FIG. 8 is an exploded perspective view showing the coil unit according to the third embodiment. A coil unit 4B according to Embodiment 3 will be described with reference to FIG.

  As shown in FIG. 8, the coil unit 4B according to the third embodiment is different from the coil unit 4A according to the second embodiment in the configuration of the ferrite plate 70B. Other configurations are almost the same.

  The ferrite plate 70B has a plurality of divided ferrites 70F1 and 70F3. Each of the plurality of divided ferrites 70F1 has a plate-like portion 71.

  Of the plurality of divided ferrites, two divided ferrites 70F3 include a plate-like portion 71 and a filter 70F4 (see FIG. 9). The filter 70F4 removes noise from the power supplied from the coil unit and supplies the rectifier 6 with the noise.

  Also in the present embodiment, ferrite plate 70B has a flat plate portion and a protruding portion. The flat plate is configured by a plate-like portion 71 included in each of the plurality of divided ferrites 70F1 and 70F3. The protruding portion is constituted by a core 75 (see FIG. 9) described later included in each of the two divided ferrites 70F3.

  Each of the surfaces of the plate-like portion 71 included in the plurality of divided ferrites 70F1 and 70F3 facing the base portion 41 of the resin lid 40 is located on substantially the same plane. The thickness of the split ferrite 70F3 along the coil winding axis O1 is partially thicker than the thickness of the split ferrite 70F1. A cutout portion 65 is provided in the shield member 60 at a portion corresponding to a portion where the divided ferrite 70F3 is thick, that is, a portion where a filter 70F4 described later is provided.

  By providing the notch 65, when the shield member 60 is placed on the ferrite plate 70B, the notch is formed on the second main surface 70b of the flat plate portion when viewed from the thickness direction of the flat plate portion. An exposed portion R1 (see FIG. 10) is formed at a position corresponding to the portion 65. The exposed portion R1 is located at a position close to the outer peripheral portion of the flat plate portion located outside the power receiving coil 8 when viewed from the thickness direction.

  FIG. 9 is a perspective view showing a part of the ferrite plate according to the third embodiment. 10 is a cross-sectional view taken along line XX shown in FIG. With reference to FIG. 9 and FIG. 10, the divided ferrite 70F3 which is a part of the ferrite plate 70B will be described.

  As shown in FIGS. 9 and 10, the filter 70F4 is located on the plate-like portion 71 so as to be located between the plate-like portion 71 and the case main body 30A. The filter 70F4 includes a filter coil 78 and a core 75 to which the filter coil 78 is attached.

  The core 75 protrudes outward from the shield member 60. The core 75 includes a plate-like portion 76, leg portions 77A and 75B, and a protruding portion 77C. The plate-like portion 76 is substantially parallel to the plate-like portion 71 of the divided ferrite 70F3. The plate-like portion 76 has a shape corresponding to the plate-like portion 71. The leg portion 77 </ b> A is connected to one side portion of the plate-like portion 76 and contacts the plate-like portion 71. The leg portion 77 </ b> B is connected to the other side portion of the plate-like portion 76 and contacts the plate-like portion 71. The leg 77A and the leg 77B extend in a direction parallel to the winding axis O1. The ridge 77C is located between the leg 77A and the leg 77B.

  The filter coil 78 is a spiral coil formed so as to surround the periphery of the protrusion 77C. When an alternating current flows through the filter coil 78, the magnetic flux MF1 flows so as to sequentially pass through the protruding portion 77C, the plate-like portion 76, the leg portion 77A (leg portion 77B), and the plate-like portion 71 of the divided ferrite 70F3. When the power receiving coil 8 receives power, the magnetic flux MF2 formed around the power receiving coil 8 also flows in the plate-like portion 71.

  FIG. 11 is a diagram illustrating an example of magnetic flux in the coil unit according to the third embodiment. With reference to FIG. 11, an example of the magnetic flux in the coil unit 3B according to the third embodiment will be described.

  The coil unit 3B has substantially the same configuration as that obtained by inverting the coil unit 4B in the vertical direction. For this reason, in the coil unit 3B shown in FIG. 11, the same code | symbol is attached | subjected about the same or common part as the coil unit 4B.

  As shown in FIG. 11, as a part of the magnetic flux generated by the power transmission coil 12, there are magnetic fluxes MF11, MF21, MF31 and MF12, MF22, MF32 that wrap around the side surface of the ferrite plate 70B. The magnetic fluxes MF12, MF22, and MF32 are in a positional relationship corresponding to the magnetic fluxes MF11, MF21, and MF31 in the longitudinal direction of the vehicle.

  Focusing on the magnetic fluxes MF11, MF21, and MF31 on the front side of the vehicle, the magnetic flux MF11 spreads to the front side of the vehicle most. The magnetic flux MF11 enters the ferrite plate 70B from the side surface into the ferrite plate 70B on the vehicle front side. The magnetic flux MF21 is located between the magnetic flux MF11 and the magnetic flux MF31. The magnetic flux MF21 enters the ferrite plate 70B from the side surface into the ferrite plate 70B on the vehicle front side. The magnetic flux MF31 is located closest to the ferrite plate 70B. The magnetic flux MF31 goes around the lower side of the shield member 60 without entering the ferrite plate 70B (divided ferrite 70F1).

  On the other hand, paying attention to the magnetic fluxes MF12, MF22, and MF32 on the rear side of the vehicle, the magnetic flux MF12 spreads to the rearmost side of the vehicle. The magnetic flux MF12 is reflected by the second shield member 68 on the vehicle rear side, and is not captured by the ferrite plate 70 (divided ferrite 70F1). The magnetic flux MF22 is located between the magnetic flux MF12 and the magnetic flux MF32. Similarly to the magnetic flux MF12, the magnetic flux MF22 is reflected by the second shield member 68 and is not captured by the ferrite plate 70 (divided ferrite 70F1). The magnetic flux MF32 tends to go around to the second main surface 70b side of the flat plate portion.

  Since the core 75 that protrudes outward from the shield member 60 is disposed in the split ferrite 70F3 on the second housing portion 20b side in which the power device is housed, the magnetic flux MF32 is captured by the core 75, and the core 75 is Through the plate-like portion 71.

  As described above, in the third embodiment, the second housing portion 20b including the second shield member 68 is disposed adjacent to the first housing portion 20a that houses the coil and the like. Even when it is difficult for the magnetic flux to enter the ferrite plate 70 from the side, by arranging the core 75 connected to the plate-like portion 71 on the side where the second accommodating portion 20b is located, the plate-like portion 71 And part of the magnetic flux that is about to enter between the base portion 31 of the case body 30 can be drawn into the split ferrite 70F1. Thereby, the amount of magnetic flux entering the ferrite plate 70 can be increased. As a result, it is possible to reduce a partial decrease in coupling constant resulting from the asymmetry of the structure of the coil unit on the front side and the rear side of the vehicle.

  When the filter 70F4 is provided, an electronic component is mounted on the substrate 50 or the shape of the substrate 50 is changed so as not to interfere with the filter 70F4. Thereby, it can suppress that a coil unit becomes tall and becomes large.

  As described above, the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, and includes meanings equivalent to the terms of the claims and all modifications within the scope.

  DESCRIPTION OF SYMBOLS 1 Non-contact charging system, 2 Vehicle, 3, 3A, 3B, 3X, 4, 4A, 4B Coil unit, 5 Resonator, 6 Rectifier, 7 Battery, 8 Power receiving coil, 8R Opening part, 9 Capacitor, 10 Power supply, 11 Converter, 12 Power transmission coil, 13 Capacitor, 14 Resonator, 15 Floor panel, 20, 20A housing case, 20a First housing portion, 20b Second housing portion, 25 Volts, 30, 30A Case body, 30A1 First case portion , 30A2 second case part, 31 base part, 32 peripheral wall part, 33A, 33F fixing part, 34A, 34F through hole, 35T, 44T overhang part, 37 support wall, 40, 40A resin lid, 40A1 first lid part, 40A2 2nd cover part, 41 base part, 42 annular wall part, 43 collar part, 45B positioning pin, 50 substrate, 60 seal Member, 68 Second shield member, 70, 70A, 70B, 70X Ferrite plate, 70F, 70F1, 70F2, 70F3 Split ferrite, 70F4 filter, 71 Plate-like part, 72 Protruding part, 73 Corner part, 74 Notch part, 75 core 76 Plate-like part, 77A, 77B Leg part, 77C Projection part, 78 Filter coil, 80 Bobbin, 81, 82 Main surface, 83 Rib, 84 Housing part, 85 Coil groove.

Claims (1)

A ferrite plate including a flat plate portion having a first main surface and a second main surface arranged in the thickness direction, and a protruding portion;
A coil formed so as to surround a winding axis extending in the thickness direction of the ferrite plate, and disposed on the first main surface side;
A shield member disposed on the second main surface,
The second main surface includes an outer peripheral portion located outside the coil when viewed from the thickness direction, and an exposed portion located at a position close to the outer peripheral portion and exposed from the shield member,
The said protrusion part is a coil unit provided in the said exposed part so that it may protrude in the said thickness direction rather than the said shield member.

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