JP2021158755A - Circuit board unit - Google Patents

Abstract

To provide a circuit board unit capable of improving the heat dissipation effect.SOLUTION: The circuit board unit for controlling a power transmission unit that transmits the electric power to a power receiving unit attached to an electric motor car in a non-contact manner, includes: a circuit board that produces an alternating current or voltage for exciting the coil of the power transmission unit; a heat sink that dissipates heat from the circuit board; and an exterior case that covers the heat sink and has an intake port for taking in the air and an exhaust port for exhausting the air.SELECTED DRAWING: Figure 12

Description

The present disclosure relates to a substrate unit.

Patent Document 1 discloses a charger that has a waterproof structure and efficiently dissipates heat energy of heat-generating components from the outside to reduce temperature rise.

Japanese Unexamined Patent Publication No. 2012-39831

In Patent Document 1, heat-generating components of a circuit board are arranged in a heat-bonded state on a metal cover via a potting resin, and the heat of the heat-generating components is conducted to the metal cover and radiated to the outside. However, if the amount of heat generated by the heat-generating component increases, a sufficient heat dissipation effect may not be obtained.

The non-limiting examples of the present disclosure contribute to the provision of a power receiving unit capable of improving the heat dissipation effect.

The board unit according to an embodiment of the present disclosure is a board unit that controls a power transmission unit that transmits electric power to a power receiving unit attached to an electric vehicle in a non-contact manner, and is an alternating current or an alternating current that excites a coil of the power transmission unit. It has a substrate that generates an AC voltage, a heat sink that dissipates heat from the substrate, an outer case that covers the heat sink and has an intake port that takes in air and an exhaust port that exhausts the air.

According to one embodiment of the present disclosure, the heat dissipation effect can be improved.

Further advantages and effects in one embodiment of the present disclosure will be apparent from the specification and drawings. Such advantages and / or effects are provided by some embodiments and features described in the specification and drawings, respectively, but not all need to be provided in order to obtain one or more identical features. There is no.

The figure which showed the application example of the non-contact power supply system which concerns on embodiment Enlarged view of area A1 in FIG. The figure which showed the power transmission unit and the board unit The figure which showed the power transmission unit and the board unit Perspective view of the power transmission unit from the front side Perspective view of the power transmission unit from the rear side Three views of the power transmission unit An exploded perspective view of the power transmission unit Perspective view of the board unit from the front side Perspective view of the board unit as seen from the back side Three views of the board unit An exploded perspective view of the board unit Perspective view from the front side of the power receiving unit Perspective view from the back side of the power receiving unit Three views of the front exterior case Three views of the rear exterior case An exploded perspective view of the power receiving unit Perspective view of the power receiving unit with the rear exterior case removed

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of already well-known matters and duplicate explanations for substantially the same configuration may be omitted. This is to avoid unnecessary redundancy of the following description and to facilitate the understanding of those skilled in the art.

It should be noted that the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

FIG. 1 is a diagram showing an application example of the non-contact power supply system according to the embodiment. FIG. 1 shows an electric vehicle 10 and a charging station 20.

The electric vehicle 10 is, for example, an electric kick scooter that operates electrically. The charging station 20 is a charging station that charges the battery of the electric vehicle 10.

Charging stations 20 are installed in various places in the city, for example. The user of the electric vehicle 10 can abandon the electric vehicle 10 from, for example, a charging station 20 installed at a certain place in the city to a charging station 20 installed at another place in the city.

The charging station 20 has, for example, a stand 21 that sandwiches the front wheels of the electric vehicle 10. The electric vehicle 10 is leaned against the charging station 20 by, for example, having the front wheels sandwiched between the stands 21. The electric vehicle 10 is leaned against the charging station 20 at a certain position and posture.

FIG. 2 is an enlarged view of the region A1 of FIG. In FIG. 2, the same components as those in FIG. 1 are designated by the same reference numerals.

As shown in FIG. 2, the electric vehicle 10 has a power receiving unit 11, a battery 12, and a handle shaft 13. The power receiving unit 11 and the battery 12 are provided, for example, on the handle shaft 13 of the electric vehicle 10.

As described above, the electric vehicle 10 is leaned against the charging station 20 at a certain position and posture. Therefore, when the electric vehicle 10 is leaned against the charging station 20, the power receiving unit 11 is arranged so as to be close to the power transmission unit provided in the charging station 20 (see, for example, the power transmission unit 31 in FIG. 3). The proximity of the power receiving unit 11 and the power transmission unit may include contact.

As a result, the power receiving unit 11 of the electric vehicle 10 can receive electric power from the power transmission unit when the electric vehicle 10 is leaned against the charging station 20. The power receiving unit 11 can charge the battery 12 with the electric power received from the power transmission unit.

FIG. 3 is a diagram showing a power transmission unit 31 and a board unit 32. In FIG. 3, the same components as those in FIG. 2 are designated by the same reference numerals. FIG. 3 shows how the power receiving unit 11 is close to the power transmission unit 31.

The power transmission unit 31 and the board unit 32 shown in FIG. 3 are installed (fixed) at the charging station 20 shown in FIG. The power transmission unit 31 is installed in the charging station 20 so as to be close to the electric vehicle 10 leaning against the charging station 20. For example, the power transmission unit 31 is installed in the charging station 20 so that a part of the power transmission unit 31 is exposed from the front plate 22 of the charging station 20 shown in FIG. The power transmission unit 31 is also provided in holes A2 and A3 of the charging station 20 shown in FIG.

The board unit 32 is connected to the power transmission unit 31 and controls the power transmission unit 31. The board unit 32 is fixed to, for example, the back side of the front plate 22 of the charging station 20 shown in FIG.

The board unit 32 is connected to an AC power source (not shown). The board unit 32 generates, for example, an AC current or an AC voltage of several tens of kHz based on the electric power of the AC power source, and outputs (supplies) the AC current or the AC voltage to the power transmission unit 31. The power transmission unit 31 generates a magnetic flux based on an alternating current or an alternating voltage output from the substrate unit 32, and supplies electric power to the power receiving unit 11 via the magnetic flux.

The power receiving unit 11, the power transmission unit 31, and the board unit 32 may be referred to as a non-contact power feeding system.

FIG. 4 is a diagram showing a power transmission unit 31 and a board unit 32. In FIG. 4, the same components as those in FIG. 3 are designated by the same reference numerals. FIG. 4 shows how the power receiving unit 11 is separated from the power transmission unit 31.

As shown in FIG. 4, the power receiving unit 11 sandwiches the handle shaft 13 and is fixed to the handle shaft 13. In other words, the handle shaft 13 penetrates the power receiving unit 11.

The power receiving unit 11 and the power transmission unit 31 have a shape to be fitted. For example, the power receiving unit 11 has a protrusion extending along the axial direction of the handle shaft 13, as shown by the arrow A11. As shown by the arrow A12, the power transmission unit 31 has a recessed portion extending along the axial direction of the handle shaft 13.

The protrusion of the power receiving unit 11 fits into the recess of the power transmission unit 31 when the electric vehicle 10 is leaned against the charging station 20 (see FIG. 3). As a result, the power receiving unit 11 and the power transmission unit 31 can be prevented from being displaced in the horizontal direction. Further, the non-contact power feeding system can suppress a decrease in power feeding efficiency by preventing the power receiving unit 11 and the power transmission unit 31 from being displaced from each other.

FIG. 5 is a perspective view of the power transmission unit 31 as viewed from the front side. FIG. 6 is a perspective view of the power transmission unit 31 as viewed from the rear side. FIG. 7 is a three-view view of the power transmission unit 31. In FIGS. 5 to 7, the same components as those in FIG. 4 are designated by the same reference numerals. The side where the recessed portion 33 of the power transmission unit 31 is formed is the front surface of the power transmission unit 31.

The power transmission unit 31 has a recess 33 extending in the vertical direction. The recessed portion 33 has an arcuately recessed shape. The power transmission unit 31 is fixed to the charging station 20 so that the recess 33 is exposed from the front plate 22 of the charging station 20, for example, as shown in FIG.

FIG. 8 is an exploded perspective view of the power transmission unit 31. As shown in FIG. 8, the power transmission unit 31 includes an outer case 41, a coil 42, a magnetic member 43, a shield member 44, and a cover 45.

The front surface of the outer case 41 has a recess 33 described with reference to FIGS. 5 to 8. The outer case 41 has an opening for accommodating the coil 42, the magnetic member 43, and the shield member 44. The outer case 41 may be formed of, for example, polycarbonate or ABS resin so that the magnetic flux generated by the coil 42 can pass through.

The coil 42 has a shape that follows the shape of the recess 33 of the outer case 41, and is curved in an arc shape. The coil 42 may be formed of, for example, a litz wire. An alternating current or an alternating voltage output from the substrate unit 32 is input to the coil 42. The coil 42 is excited by the input alternating current or alternating voltage.

The magnetic member 43 is arranged on the back surface side of the coil 42. The magnetic member 43 has a shape that follows the shape of the coil 42 and is curved in an arc shape. The magnetic member 43 forms a closed magnetic path. The magnetic member 43 may be formed of, for example, a magnetic material such as ferrite.

The shield member 44 is arranged on the back surface side of the magnetic member 43. The shield member 44 has a shape that follows the shape of the magnetic member 43 and is curved in an arc shape. The shield member 44 suppresses the leakage of the magnetic flux of the coil 42 to the back surface side. The shield member 44 may be made of, for example, aluminum.

The cover 45 closes the opening of the outer case 41. The surface of the cover 45 on the shield member 44 side has a shape that follows the shape of the shield member 44 and is curved in an arc shape. The cover 45 may be formed, for example, by polycarbonate or ABS reception.

The inside of the power transmission unit 31 containing the coil 42, the magnetic member 43, and the shield member 44 is impregnated (filled) with a resin such as a potting material having thermal conductivity. The power transmission unit 31 improves the heat dissipation effect via the impregnated resin. For example, the heat generated from the coil 42 is transferred to the charging station 20 via the resin, the outer case 41, and the cover 45, and is dissipated. That is, the power transmission unit 31 uses the charging station 20 as a heat radiating device. The resin also has dustproof and waterproof functions. From the viewpoint of heat dissipation, the charging station 20 is preferably formed of, for example, a metal or a resin having high thermal conductivity.

FIG. 9 is a perspective view of the substrate unit 32 as viewed from the front side. FIG. 10 is a perspective view of the substrate unit 32 as viewed from the back side. FIG. 11 is a three-view view of the substrate unit 32. The fin side of the heat sink 54 of the board unit 32 is the front surface of the board unit 32.

The substrate unit 32 has a heat sink 54 on the front side. As will be described with reference to FIG. 18, an outer case for covering the heat sink 54 is provided on the front surface of the substrate unit 32.

The board unit 32 is arranged in the charging station 20 in pairs with the power transmission unit 31. For example, when three power transmission units 31 are provided in the charging station 20, three board units 32 are also provided. The board unit 32 outputs an alternating current or an alternating voltage to the corresponding power transmission unit 31.

The back surface of the substrate unit 32 is flat as shown in FIG. The substrate unit 32 is fixed to the back side of the front plate 22 of the charging station 20 on the back surface.

FIG. 12 is an exploded perspective view of the substrate unit 32. As shown in FIG. 12, the substrate unit 32 includes a storage case 51, a substrate 52, a heat transfer sheet 53, a heat sink 54, and a shield plate 55.

The storage case 51 has an opening for accommodating a part of the substrate 52, the heat transfer sheet 53, and the heat sink 54. The front side of the storage case 51 is covered with the exterior case described with reference to FIG. That is, the heat sink 54 and the shield plate 55 of the storage case 51 are covered with the outer case described with reference to FIG. The storage case 51 may be made of, for example, aluminum. The storage case 51 has a flat back side (see, for example, FIG. 11), and is fixed to the back side of the front plate 22 of the charging station 20 on the back side.

On the substrate 52, for example, a circuit (component) that outputs an alternating current or an alternating voltage to the coil 42 of the power transmission unit 31 is mounted.

The heat transfer sheet 53 is attached to the front side of the substrate 52. The heat transfer sheet 53 transfers the heat generated by the substrate 52 to the heat sink 54. The heat transfer sheet 53 may be, for example, a silicon-based sheet material or an acrylic-based sheet material.

The heat sink 54 is arranged on the front side of the heat transfer sheet 53. The heat sink 54 is arranged on the substrate unit 32 (heat transfer sheet 53) so that the grooves of the plurality of fins extending linearly face in the vertical direction (vertical direction).

The surface (heat receiving surface) of the heat sink 54 opposite to the fins is in contact with the heat transfer sheet 53. The heat sink 54 dissipates the heat received on the heat receiving surface at the fins. The heat sink 54 is made of, for example, aluminum.

The shield plate 55 is arranged on the front side of the substrate 52. In other words, the shield plate 55 is arranged between the substrate 52 and the exterior case described with reference to FIG.

The shield plate 55 has a hole through which the fins of the heat sink 54 pass. The shield plate 55 is made of aluminum, for example, like the storage case 51. The accommodating case 51 and the shield plate 55 suppress the leakage of unnecessary radiation generated from the substrate 52.

The inside of the storage case 51 containing the substrate 52 and the heat transfer sheet 53 is impregnated (filled) with a resin such as a potting material having thermal conductivity. The substrate unit 32 improves the heat dissipation effect via the impregnated resin. For example, the heat generated from the substrate 52 is transferred to the charging station 20 via the resin and the storage case 51 and dissipated. That is, the substrate unit 32 uses the charging station 20 as a heat radiating device. The resin also has functions as dustproof and waterproof.

FIG. 13 is a perspective view of the power receiving unit 11 as viewed from the front side. FIG. 14 is a perspective view seen from the back side of the power receiving unit 11. The side on which the protrusion 63 of the power receiving unit 11 is formed is the front surface of the power receiving unit 11.

As shown in FIGS. 13 and 14, the power receiving unit 11 includes a front side exterior case 61 and a back side exterior case 62 (see also the front side exterior case 61 and the back side exterior case 62 in FIG. 17).

As shown in FIG. 13, the front side exterior case 61 has a semi-cylindrical protrusion 63 extending in the vertical direction. The protrusion 63 fits into the arcuate recessed portion 33 of the power transmission unit 31 (see, for example, the recessed portion 33 of FIG. 5).

As shown in FIGS. 13 and 14, the power receiving unit 11 has a cylindrical hole 64 penetrating in the vertical direction. The handle shaft 13 of the electric vehicle 10 (see, for example, the handle shaft 13 in FIG. 4) penetrates through the hole 64.

As shown in FIG. 14, the back side exterior case 62 has an air intake port 65 formed by a plurality of holes. Further, the back side exterior case 62 has an exhaust port 66 formed by a plurality of holes. The exhaust port 66 is formed above the intake port 65.

FIG. 15 is a three-view view of the front exterior case 61. In FIG. 15, the same components as those in FIGS. 13 and 14 are designated by the same reference numerals. As shown in FIG. 15, the front side exterior case 61 is formed with a notch 67 recessed in an arc shape.

FIG. 16 is a three-view view of the back side exterior case 62. In FIG. 16, the same components as in FIGS. 13 and 14 are designated by the same reference numerals. As shown in FIG. 16, the back side exterior case 62 is formed with a notch 68 recessed in an arc shape.

When the front exterior case 61 and the back exterior case 62 are combined, the notch 67 and the notch 68 form the holes 64 shown in FIGS. 13 and 14.

FIG. 17 is an exploded perspective view of the power receiving unit 11. In FIG. 17, the same components as those in FIGS. 13 to 16 are designated by the same reference numerals. FIG. 17 also shows a part of the handle shaft 13 of the electric vehicle 10.

As shown in FIG. 17, the power receiving unit 11 includes a front side exterior case 61, a packing 71, a coil 72, a magnetic member 73, a shield member 74, a shield member 75, a substrate 76, and a heat transfer sheet 77. , A heat sink 78, a shield plate 79, and a back side exterior case 62.

The front exterior case 61 has a protrusion 63. The front exterior case 61 has a notch 67. The protrusion 63 and the notch 67 have an arc shape along the columnar curved surface of the handle shaft 13 so as to accommodate a part of the handle shaft 13.

Packing 71 is provided on the upper part and the lower part of the front side exterior case 61 on the back side for the purpose of preventing the intrusion of dust and water and sealing a resin such as a conductive potting material. The front exterior case 61 has an opening for accommodating the coil 72 and the magnetic member 73. The front exterior case 61 may be formed of, for example, polycarbonate or ABS resin so that the magnetic flux generated by the power transmission unit 31 can pass through.

The coil 72 has a shape that follows the shape of the protrusion 63 of the front exterior case 61, and is curved in an arc shape. The coil 72 receives the magnetic flux (magnetic flux emitted from the power transmission unit 31) emitted from the direction opposite to the handle shaft 13. The coil 72 may be formed of, for example, a litz wire.

The magnetic flux generated by the power transmission unit 31 passes through the coil 72. The coil 72 generates an alternating current or an alternating voltage based on the passing magnetic flux. The coil 72 outputs the generated AC current or AC voltage to the substrate 76.

The magnetic member 73 is arranged on the back surface side of the coil 72. The magnetic member 73 has a shape that follows the shape of the coil 72 and is curved in an arc shape. The magnetic member 73 forms a closed magnetic path. The magnetic member 73 may be formed of, for example, a magnetic material such as ferrite.

The shield member 74 is arranged on the back surface side of the magnetic member 73. The shield member 74 has a shape that follows the shape of the magnetic member 73 and is curved in an arc shape. The shield member 74 comes into contact with the handle shaft 13. The shield member 74 suppresses the leakage of the magnetic flux of the coil 72 to the back surface side. The shield member 74 may be made of, for example, aluminum.

The shield member 75 has a notch 75a on the front edge. The notch 75a has an arc shape along the columnar curved surface of the handle shaft 13 so as to come into contact with a part of the handle shaft 13. The shield member 75 has an opening on the back surface side for accommodating a substrate 76, a heat transfer sheet 77, and a part (heat receiving surface) of the heat sink 78. The shield member 75 may be made of, for example, aluminum.

An alternating current or an alternating voltage output from the coil 72 is input to the substrate 76. A circuit that converts an alternating current or an alternating voltage into a direct current or a direct current voltage is mounted on the substrate 76. The DC current or DC voltage converted by the substrate 76 is output to the battery 12. That is, the substrate 76 charges the battery 12 based on the electric power received by the coil 72.

The heat transfer sheet 77 is attached to the back surface side of the substrate 76. The heat transfer sheet 77 transfers the heat generated by the substrate 76 to the heat sink 78. The heat transfer sheet 77 may be, for example, a silicon-based sheet material or an acrylic-based sheet material.

The heat sink 78 is arranged on the back side of the heat transfer sheet 77. In other words, the heat sink 78 is arranged on the surface of the substrate 76 opposite to the handle shaft 13.

The surface (heat receiving surface) of the heat sink 78 opposite to the fins is in contact with the heat transfer sheet 77. The heat sink 78 dissipates the heat received on the heat receiving surface at the fins. The heat sink 78 is made of, for example, aluminum.

The shield plate 79 is arranged on the back surface side of the substrate 76. The shield plate 79 has a hole through which the fins of the heat sink 78 pass. The shield plate 79 is made of aluminum, like the shield member 75, for example. The shield member 75 and the shield plate 79 suppress leakage of unnecessary radiation generated from the substrate 76.

The back side exterior case 62 has a notch 68. The notch 68 has an arc shape along the columnar curved surface of the handle shaft 13 so as to accommodate a part of the handle shaft 13. The rear exterior case 62 has an intake port 65 for taking in air and an exhaust port 66 for exhausting air taken in from the intake port 65. The back side exterior case 62 has a size that covers the side surface and the back side of the shield member 75.

As shown in FIG. 17, the power receiving unit 11 is divided into a power receiving coil unit 81 and a power receiving board unit 82.

The power receiving coil unit 81 has a front side exterior case 61, a packing 71, a coil 72, a magnetic member 73, and a shield member 74. The packing 71, the coil 72, and the magnetic member 73 are housed in the opening of the front exterior case 61. The shield member 74 closes the opening of the front exterior case 61 containing the packing 71, the coil 72, and the magnetic member 73.

The power receiving board unit 82 has a shield member 75, a board 76, a heat transfer sheet 77, a heat sink 78, a shield plate 79, and a back side exterior case 62. A part (heat receiving surface) of the substrate 76, the heat transfer sheet 77, and the heat sink 78 is housed in the opening of the shield member 75. The shield plate 79 passes the fins of the heat sink 78 through the holes of the shield plate 79, and closes the opening of the substrate 76, the heat transfer sheet 77, and the shield member 75 containing a part of the heat sink 78. The back side exterior case 62 covers the side surface and the back side of the shield member 75 whose opening is closed by the shield plate 79.

The power receiving coil unit 81 and the power receiving board unit 82 are connected (coupled) with the handle shaft 13 of the electric vehicle 10 interposed therebetween, and fixed to the handle shaft 13. For example, the shield member 74 of the power receiving coil unit 81 and the shield member 75 of the power receiving board unit 82 are brought into contact with each other across the handle shaft 13, and the power receiving coil unit 81 and the power receiving board unit 82 are connected to each other, and the handle shaft 13 is connected. Fix to.

The shield member 74 and the shield member 75 come into contact with the handle shaft 13 in order to improve the heat dissipation effect described below. In other words, the surface of the power receiving coil unit 81 facing the power receiving board unit 82 comes into contact with the handle shaft 13. The surface of the power receiving board unit 82 facing the power receiving coil unit 81 comes into contact with the handle shaft 13. Further, in order to further enhance the heat dissipation effect, a heat transfer sheet may be interposed between the shield member 74 and the shield member 75 and the handle shaft 13.

The inside of the power receiving coil unit 81 containing the packing 71, the coil 72, and the magnetic member 73 is impregnated (filled) with a resin such as a potting material having thermal conductivity. The power receiving coil unit 81 improves the heat dissipation effect through the impregnated resin. For example, the heat generated from the coil 72 is transferred to the handle shaft 13 via the resin and the shield member 74 and dissipated. That is, the power receiving coil unit 81 uses the handle shaft 13 as a heat radiating device. The resin also has functions as dustproof and waterproof.

The inside of the power receiving substrate unit 82 containing the substrate 76 and the heat transfer sheet 77 is impregnated (filled) with a resin such as a potting material having thermal conductivity. The power receiving substrate unit 82 improves the heat dissipation effect via the impregnated resin. For example, the heat generated from the substrate 76 is transferred to the handle shaft 13 via the resin and the shield member 75 and dissipated. That is, the power receiving board unit 82 uses the handle shaft 13 as a heat radiating device. The resin also has functions as dustproof and waterproof. From the viewpoint of heat dissipation, the handle shaft 13 is preferably formed of, for example, a metal or a resin having high thermal conductivity.

FIG. 18 is a perspective view of the power receiving unit 11 with the back side exterior case 62 removed. In FIG. 18, the same components as in FIG. 17 are designated by the same reference numerals.

As shown in FIG. 18, the heat sink 78 is arranged in the power receiving unit 11 so that the grooves of the plurality of fins extending linearly face in the vertical direction (vertical direction).

The intake port 65 of the rear exterior case 62 is formed in the rear exterior case 62 so as to be located below the central portion of the heat sink 78. For example, the intake port 65 of the rear exterior case 62 is formed in the rear exterior case 62 so as to be located below the horizontal alternate long and short dash line A21 that passes through the central portion of the heat sink 78.

The exhaust port 66 of the rear exterior case 62 is formed in the rear exterior case 62 so as to be located above the central portion of the heat sink 78. For example, the exhaust port 66 of the back side exterior case 62 is formed in the back side exterior case 62 so as to be located above the alternate long and short dash line A21.

The air warmed by the heat sink 78 flows upward. For example, the fins of the heat sink 78 have grooves oriented in the vertical direction, and the air warmed by the heat sink 78 flows upward.

The air warmed by the heat sink 78 flowing upward is exhausted from the exhaust port 66 located above the central portion of the heat sink 78. As the air warmed by the heat sink 78 flows upward, the air flows in from the intake port 65 located below the central portion of the heat sink 78.

That is, the power receiving unit 11 can efficiently dissipate the heat generated from the substrate 76 by utilizing the convection of air.

Similarly to the power receiving unit 11, the groove of the heat sink 54 of the substrate unit 32 on the power transmission side faces in the vertical direction (see, for example, FIG. 9).

Further, in the substrate unit 32, an outer case having an intake port and an exhaust port is attached to the front side in the same manner as the power receiving unit 11. For example, an exterior case similar to the back side exterior case 62 shown in FIG. 17 is attached to the front side of the substrate unit 32 shown in FIG.

As a result, the substrate unit 32 can efficiently dissipate the heat generated from the substrate 52 by utilizing the convection of air.

As described above, the power receiving unit 11 is attached to the electric vehicle 10 and receives electric power from the charging station 20 in a non-contact manner. The power receiving coil unit 81 of the power receiving unit 11 has a coil 72 that receives the magnetic flux emitted from the power transmission unit 31 provided in the charging station 20. The power receiving board unit 82 of the power receiving unit 11 has a board 76 that receives the current or voltage output from the coil 72 and charges the battery 12 of the electric vehicle 10. The power receiving coil unit 81 and the power receiving board unit 82 are connected with the handle shaft 13 of the electric vehicle 10 interposed therebetween.

As a result, the power receiving unit 11 can improve the heat dissipation effect. For example, the power receiving unit 11 can transfer the heat generated from the coil 72 of the power receiving coil unit 81 to the handle shaft 13 and release the heat from the handle shaft 13. The power receiving unit 11 can transfer the heat generated from the substrate 76 of the power receiving substrate unit 82 to the handle shaft 13 and release the heat from the handle shaft 13.

Further, the front side exterior case 61 has a notch 67. The coil 72, the magnetic member 73, and the shield member 74 are curved along the shape of the handle shaft 13. The shield member 75 has a notch 75a. The back side exterior case 62 has a notch 68. As a result, the power receiving unit 11 can be miniaturized.

Further, the board unit 32 controls a power transmission unit 31 that transmits electric power to the power receiving unit 11 attached to the electric vehicle 10 in a non-contact manner. The substrate 52 of the substrate unit 32 generates an alternating current or an alternating voltage that excites the coil 42 of the power transmission unit 31. The heat sink 54 of the substrate unit 32 dissipates heat from the substrate 52. The outer case covers the heat sink 54 and has an intake port for taking in air and an exhaust port for exhausting air.

As a result, the substrate unit 32 can improve the heat dissipation effect. For example, the substrate unit 32 can flow the air taken in from the intake port to the heat sink 54 and exhaust the air warmed by the heat sink 54 from the exhaust port.

In the above, as an example of the electric vehicle 10, an electric kick scooter is mentioned, but the present invention is not limited to this. The electric vehicle 10 may be an electric bicycle. In the case of an electric bicycle, the power receiving unit 11 may be provided on, for example, a front fork. The power receiving unit 11 has a front fork so that the power receiving coil unit 81 and the power receiving board unit 82 sandwich the front fork, the power receiving coil unit 81 is located on the front side of the electric bicycle, and the power receiving board unit 82 is located on the rear side of the electric bicycle. Is fixed to. Further, the electric vehicle 10 may include a vehicle that is electrically assisted.

The mounting position of the power receiving unit 11 is not limited to the handle shaft. The power receiving unit 11 may be attached to a columnar frame other than the handle shaft 13. The frame is not limited to a columnar shape. The frame may be a polygonal column such as a square column.

In the above-described embodiment, the notation "... part" used for each component is replaced with another notation such as "... device", "... unit", or "... module". It may be replaced.

Although the embodiments have been described above with reference to the drawings, the present disclosure is not limited to such examples. It is clear to those skilled in the art that various modifications or modifications can be conceived within the scope of the claims. It is understood that such modifications or modifications also fall within the technical scope of the present disclosure. In addition, each component in the embodiment may be arbitrarily combined without departing from the gist of the present disclosure.

The present disclosure is useful for non-contact power supply systems for electric vehicles such as electric kick scooters or electric bicycles.

10 Electric vehicle 11 Power receiving unit 12 Battery 13 Handle shaft 20 Charging station 21 Stand 22 Front plate 31 Transmission unit 32 Board unit 33 Indentation 41 Exterior case 42 Coil 43 Magnetic member 44 Shield member 45 Cover 51 Storage case 52 Board 53 Heat transfer sheet 54 Heat sink 55 Shield plate 61 Front side exterior case 62 Back side exterior case 63 Protrusion 64 Hole 65 Intake port 66 Exhaust port 71 Packing 72 Coil 73 Magnetic member 74,75 Shield member 76 Board 77 Heat transfer sheet 78 Heat sink 79 Shield plate 81 Power receiving coil unit 82 Power receiving board unit

Claims (6)

It is a board unit that controls a power transmission unit that transmits electric power in a non-contact manner to a power receiving unit attached to an electric vehicle.
A substrate that generates an alternating current or an alternating voltage that excites the coil of the power transmission unit.
A heat sink that dissipates heat from the substrate,
An exterior case that covers the heat sink and has an intake port that takes in air and an exhaust port that exhausts the air.
Board unit with. The heat sink is arranged so that the groove of the fin extending linearly faces in the vertical direction.
The board unit according to claim 1. The intake port is formed below the central portion of the heat sink.
The exhaust port is formed above the central portion of the heat sink.
The board unit according to claim 2. A storage case that houses the substrate and is covered with the outer case,
It has a shield plate which is arranged between the substrate and the exterior case and suppresses unnecessary radiation of the substrate.
The board unit according to any one of claims 1 to 3. The storage case is filled with a resin having thermal conductivity.
The board unit according to claim 4. The storage case is fixed to a charging station on which the electric vehicle is leaned.
The substrate unit according to claim 4 or 5.

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