JPWO2016143341A1 - Non-contact power supply device and non-contact power supply system - Google Patents

Abstract

The subject of this invention is providing the non-contact electric power feeder which can improve heat dissipation, and a non-contact electric power feeding system. A non-contact power supply device (100) according to the present invention includes a power supply unit (10), a power supply coil (15), and a housing (30) that houses a target component. The housing (30) includes a base (31) to which the target component is attached and a cover (32) that covers the target component and is attached to the base (31). The base (31) has thermal conductivity and is formed in a plate shape. In the base (31), the target component is disposed on the first surface (31a) in the thickness direction. The cover (32) is made of a nonmetallic material. The base (31) has a groove (33) formed on the second surface (31b) opposite to the first surface (31a) in the thickness direction.

Description

  The present invention generally relates to a non-contact power supply apparatus and a non-contact power supply system, and more particularly to a non-contact power supply apparatus that supplies power to a power supply in a non-contact manner and a non-contact power supply system including the same.

  In recent years, there has been proposed a power supply device that supplies power to a power receiving unit provided in a vehicle in a contactless manner (for example, Patent Document 1).

  The power supply apparatus described in Patent Literature 1 includes a power supply side communication unit, a power supply side control unit, and a power supply unit. The power feeding device is installed or embedded on the ground such that the power feeding unit is exposed from the ground surface.

  The power supply unit includes a power supply coil. The power supply unit supplies power to the power reception unit in a non-contact manner by supplying a current having a predetermined frequency to the power supply coil according to the control of the power supply side control unit.

  Incidentally, the non-contact power feeding device such as the power feeding device described in Patent Document 1 is desired to improve heat dissipation.

International Publication No. 2013/145579

  An object of the present invention is to provide a non-contact power supply device and a non-contact power supply system that can improve heat dissipation.

  A contactless power supply device according to an aspect of the present invention includes a power supply unit that outputs an AC voltage, a power supply coil that is supplied with the AC voltage in a contactless manner, and a housing that houses a target component including the power supply coil. It has. The housing includes a base to which the target part is attached and a cover that covers the target part and is attached to the base. The base has thermal conductivity and is formed in a plate shape. Moreover, the said target component is arrange | positioned at the said base on the 1st surface of the thickness direction. The cover is made of a nonmetallic material. The base has a groove formed on a second surface opposite to the first surface in the thickness direction.

  A non-contact power feeding system according to an aspect of the present invention includes the non-contact power feeding device and a non-contact power receiving device that is fed in a non-contact manner from the non-contact power feeding device.

In the non-contact electric power feeder of Embodiment 1, it is sectional drawing which shows the state with which one part was fractured | ruptured. It is a perspective view of the non-contact electric power feeder same as the above. It is a circuit diagram of the non-contact electric power feeding system provided with the non-contact electric power feeder same as the above. It is a schematic diagram which shows the usage example of the said non-contact electric power feeding system. It is a circuit diagram of the non-contact electric power feeding system provided with other composition of the non-contact electric power feeder same as the above. It is a schematic diagram which shows the usage example of the non-contact electric power feeding system provided with the non-contact electric power feeder of the comparative example. It is a circuit diagram of the non-contact electric power feeding system provided with another composition of the non-contact electric power feeder of Embodiment 1. It is a side view of the base of the non-contact electric power feeder of Embodiment 2. It is AA sectional drawing of FIG. In the non-contact electric power feeder of Embodiment 3, it is sectional drawing which shows the state with which one part was fractured | ruptured. It is a perspective view of the non-contact electric power feeder same as the above. In the non-contact electric power feeder of Embodiment 4, it is sectional drawing which shows the state with which one part was fractured | ruptured. In the non-contact electric power feeder of Embodiment 5, it is sectional drawing which shows the state with which one part was fractured | ruptured. In the non-contact electric power feeder of Embodiment 6, it is sectional drawing which shows the state with which one part was fractured | ruptured. It is a graph which shows an example of the resonance characteristic of the non-contact electric power supply of Embodiments 1-6.

(Embodiment 1)
Below, the non-contact electric power feeder 100 of Embodiment 1 is demonstrated, referring FIGS. 1-4. In the following, for convenience of description, the non-contact power feeding system 300 including the non-contact power feeding device 100 (see FIGS. 3 and 4) will be described, and then the non-contact power feeding device 100 will be described in detail.

  The non-contact power supply system 300 includes a non-contact power supply device 100 and a non-contact power reception device 200.

  The non-contact power supply apparatus 100 is installed on the ground 600 of a space (parking space) where the vehicle 500 (see FIG. 4) can be parked, for example. The vehicle 500 is, for example, an electric vehicle. The ground 600 is, for example, concrete. Note that the vehicle 500 is not limited to an electric vehicle, and may be a hybrid electric vehicle, for example. Further, the ground 600 is not limited to concrete, and may be asphalt or soil, for example.

  The non-contact power receiving device 200 is configured to be fed in a non-contact manner from the non-contact power feeding device 100. The non-contact power receiving apparatus 200 is attached to the bottom of the vehicle 500, for example.

  For example, as shown in FIG. 3, the non-contact power receiving apparatus 200 includes a pair of output terminals 2 </ b> A and 2 </ b> B, a power receiving unit 20, and a rectifier circuit 23.

  For example, a load 50 of the vehicle 500 is electrically connected between the pair of output terminals 2A and 2B. The load 50 includes, for example, a battery 51 (see FIG. 4) and a charging device 52 (see FIG. 4). The charging device 52 is configured to charge the battery 51.

  The power reception unit 20 is configured to receive power supplied from the non-contact power supply apparatus 100 in a non-contact manner. The power receiving unit 20 includes, for example, a power receiving coil 21 and a capacitor 22. The power receiving coil 21 is, for example, a spiral coil. In addition, although the receiving coil 21 is a spiral coil, it is not restricted to this, For example, a solenoid coil etc. may be sufficient. The spiral coil means a coil (planar coil) in which a conducting wire is wound in a spiral shape in a plan view. The solenoid coil means a coil in which a conducting wire is spirally wound around an iron core (core).

  The rectifier circuit 23 is configured to rectify the power received by the power receiving unit 20. The rectifier circuit 23 is a diode bridge, for example.

  The first input terminal of the pair of input terminals of the rectifier circuit 23 is electrically connected to the first terminal of the power receiving coil 21 via the capacitor 22. The second input end of the pair of input ends of the rectifier circuit 23 is electrically connected to the second end of the power receiving coil 21.

  The first output terminal of the pair of output terminals of the rectifier circuit 23 is electrically connected to the output terminal 2A. The second output terminal of the pair of output terminals of the rectifier circuit 23 is electrically connected to the output terminal 2B.

  The non-contact power receiving apparatus 200 may include a smoothing unit that smoothes the power rectified by the rectifier circuit 23, for example. The smoothing unit is, for example, a capacitor.

  The non-contact power supply apparatus 100 includes, for example, a pair of input terminals 1A and 1B, a rectifying / smoothing circuit 11, a power supply unit 10, a power supply coil 15, and a housing 30 (see FIGS. 1 and 2).

  For example, an AC power supply 400 is electrically connected between the pair of input terminals 1A and 1B. The AC power source 400 is, for example, a commercial power source.

  The rectifying / smoothing circuit 11 is configured to rectify and smooth the AC voltage (first AC voltage) of the AC power supply 400, for example. The rectifying / smoothing circuit 11 is, for example, a circuit in which a diode bridge and a capacitor (for example, an electrolytic capacitor) are combined.

  The first input terminal of the pair of input terminals of the rectifying / smoothing circuit 11 is electrically connected to the input terminal 1A. The second input terminal of the pair of input terminals of the rectifying / smoothing circuit 11 is electrically connected to the input terminal 1B. A pair of output terminals of the rectifying / smoothing circuit 11 is electrically connected to the power supply unit 10.

  The power supply unit 10 is configured to output an alternating voltage (second alternating voltage). The power supply unit 10 includes, for example, an inverter circuit 12, a control circuit 13, and a capacitor 14.

  The inverter circuit 12 is configured to convert a DC voltage into a second AC voltage. More specifically, the inverter circuit 12 is configured to convert the voltage rectified and smoothed by the rectifying and smoothing circuit 11 into a second AC voltage. The inverter circuit 12 is, for example, a full bridge circuit.

  The first input terminal of the pair of input terminals of the inverter circuit 12 is electrically connected to the first output terminal of the pair of output terminals of the rectifying and smoothing circuit 11. The second input terminal of the pair of input terminals of the inverter circuit 12 is electrically connected to the second output terminal of the pair of output terminals of the rectifying and smoothing circuit 11.

  The first output terminal of the pair of output terminals of the inverter circuit 12 is electrically connected to the first terminal of the power feeding coil 15 via the capacitor 14. The second output end of the pair of output ends of the inverter circuit 12 is electrically connected to the second end of the feeding coil 15.

  The inverter circuit 12 is not limited to a full bridge circuit, and may be a half bridge circuit, for example.

  The control circuit 13 is configured to control the inverter circuit 12. The control circuit 13 is a microcomputer, for example. The microcomputer includes a memory in which a program is stored. In this program, for example, an operation mode for operating the non-contact power feeding apparatus 100 is described. The control circuit 13 is not limited to the microcomputer, and may be a microprocessor or a microcontroller, for example. The control circuit 13 is not limited to the microcomputer, and may be, for example, a control IC (Integrated Circuit).

  The capacitor 14 is configured to form a resonance circuit together with the feeding coil 15. More specifically, the capacitance of the capacitor 14 is set so that the capacitor 14 forms the resonance circuit together with the feeding coil 15.

  In the non-contact power supply apparatus 100, for example, a PFC (Power Factor Correction) circuit may be provided between the rectifying / smoothing circuit 11 and the inverter circuit 12.

  Moreover, although the non-contact electric power feeder 100 is provided with the rectification smoothing circuit 11, it does not need to be provided with the rectification smoothing circuit 11, as shown in FIG. In this case, the pair of input terminals 1 </ b> A and 1 </ b> B are electrically connected to the pair of input terminals of the inverter circuit 12. The rectifying / smoothing circuit 11 is disposed outside the housing 30.

  For example, as shown in FIG. 1, the power supply unit 10 includes a plurality of electronic components 3 and a plurality of substrates 4. The power supply unit 10 includes a plurality of substrates 4, but may include a single substrate 4. In this case, a plurality of electronic components 3 are mounted on one substrate 4.

  A plurality of electronic components 3 are mounted on each of the plurality of substrates 4. Each of the plurality of substrates 4 is a printed circuit board, for example.

  In the power supply unit 10, the plurality of electronic components 3 and the plurality of substrates 4 constitute an inverter circuit 12 and a control circuit 13. In the power supply unit 10, a capacitor 14 is mounted on one substrate 4 among the plurality of substrates 4.

  The feeding coil 15 is configured such that the second AC voltage from the power supply unit 10 is applied. The power supply coil 15 is configured to supply power to a power supply target (for example, the non-contact power reception device 200) in a non-contact manner.

  The feeding coil 15 is formed, for example, so as to have a rectangular shape in plan view (see FIG. 2). The feeding coil 15 is, for example, a spiral coil. The feeding coil 15 is a spiral coil, but is not limited thereto, and may be a solenoid coil, for example. Moreover, although the feeding coil 15 is formed so as to have a rectangular shape in plan view, the present invention is not limited thereto. For example, the power supply coil 15 may be formed so as to have a square shape in plan view. Further, the feeding coil 15 may be formed, for example, so as to have an elliptical shape in plan view. Furthermore, the feeding coil 15 may be formed, for example, so as to have a circular shape in plan view.

  The housing 30 stores a target component including, for example, the power supply unit 10 and the power feeding coil 15.

  The housing 30 includes a base 31 and a cover 32.

  For example, the target component is attached to the base 31. The base 31 is formed in a plate shape (for example, a rectangular plate shape). The base 31 has thermal conductivity. The base 31 is made of metal, for example. The metal is, for example, aluminum.

  Each of the plurality of substrates 4 is disposed on the upper surface 31 a of the base 31 via the insulating member 5. That is, in the non-contact power supply apparatus 100, the plurality of insulating members 5 are disposed on the upper surface 31 a of the base 31. In the present embodiment, the upper surface 31 a of the base 31 corresponds to the first surface of the base 31.

  Each of the plurality of insulating members 5 has electrical insulation and thermal conductivity. Each of the plurality of insulating members 5 is, for example, a heat dissipation sheet. Each of the plurality of insulating members 5 is not limited to the heat dissipation sheet, and may be, for example, heat dissipation grease.

  In the non-contact power supply apparatus 100, each of the plurality of substrates 4 is disposed on the upper surface 31 a of the base 31 via the insulating member 5, so that heat generated in the power supply unit 10 can be radiated to the base 31. Become. Each of the plurality of substrates 4 may be fixed to the upper surface 31a of the base 31 using, for example, a screw (first screw).

  The feeding coil 15 is disposed on the upper surface 31 a of the base 31 via the insulating member 5. As a result, in the non-contact power supply apparatus 100, it is possible to radiate heat generated in the power supply coil 15 to the base 31. In the non-contact power supply apparatus 100, one substrate 4 and one power supply coil 15 are arranged on one insulating member 5 among the plurality of insulating members 5, but the invention is not limited thereto.

  The cover 32 covers the target part, for example. The cover 32 is attached to the base 31.

  The cover 32 is made of a nonmetallic material. Nonmetallic materials are synthetic resin etc., for example. The synthetic resin is, for example, a fiber reinforced plastic. Note that the non-metallic material is not limited to a synthetic resin. The non-metallic material may be any material that allows the magnetic field generated by the feeding coil 15 to pass therethrough.

  Hereinafter, the operation of the non-contact power feeding apparatus 100 will be briefly described with reference to FIG.

  In the non-contact power supply apparatus 100, when the control circuit 13 controls the inverter circuit 12 to operate, the inverter circuit 12 converts the voltage rectified and smoothed by the rectifying and smoothing circuit 11 into a second AC voltage. Thereby, in the non-contact power supply apparatus 100, the second AC voltage from the inverter circuit 12 can be applied to the power supply coil 15. At this time, the voltage applied to the feeding coil 15 is resonated by the resonance circuit of the capacitor 14 and the feeding coil 15.

  In the non-contact power supply device 100, when a second AC voltage is applied to the power supply coil 15, the non-contact power reception device 200 (specifically, the power reception coil 200 receives power from the power supply coil 15 by electromagnetic induction caused by a magnetic field generated in the power supply coil 15. It is possible to supply power to the part 20) in a non-contact manner.

  Incidentally, for example, a plurality of groove portions 33 are formed on the lower surface 31b of the base 31 (see FIGS. 1 and 2). Each of the plurality of groove portions 33 is formed in a straight line, for example. In the present embodiment, the lower surface 31 b of the base 31 corresponds to the second surface of the base 31.

  Each of the plurality of groove portions 33 is disposed so as to be parallel to each other, for example. In other words, in the non-contact power feeding device 100, the lower surface of the base 31 is formed in a striped shape (stripe shape).

  In the non-contact power feeding device 100, when the non-contact power feeding device 100 is installed on the ground 600, a path for flowing gas (air) is formed between the base 31 and the ground 600 by each of the plurality of grooves 33. . Thereby, in the non-contact electric power feeder 100, the heat radiated to the base 31 can be released from the plurality of grooves 33. Therefore, in the non-contact power supply apparatus 100, for example, it is possible to improve heat dissipation as compared with the case where the groove portion 33 is not formed on the lower surface 31b of the base 31.

  In addition, although the several groove part 33 is formed in the lower surface 31b of the base 31, the one groove part 33 may be formed. Moreover, although the lower surface of the base 31 is configured in a striped shape, the configuration is not limited to this, and for example, the base 31 may be configured in a radial shape or a lattice shape.

  For example, a mounting portion 34 is provided on the side surface 31 c of the base 31. For example, a plurality of attachment portions 34 are provided on the side surface 31c of the groove portion 33 of the base 31 in the short direction (width direction). Each of the plurality of attachment portions 34 is formed with a hole 34 a through which a screw (second screw) 35 for installing the non-contact power feeding device 100 on the ground 600 is passed.

  Each of the plurality of attachment portions 34 is provided on the side surface 31 c of the base 31. Specifically, each of the plurality of attachment portions 34 is welded to the side surface 31 c of the base 31. Each of the plurality of attachment portions 34 is provided on the side surface 31c of the base 31, but is not limited thereto. Each of the plurality of attachment portions 34 may be formed as a part of the side surface 31 c of the base 31. Each of the plurality of attachment portions 34 may be detachably formed on the side surface 31 c of the base 31.

  Next, a non-contact power feeding apparatus 900 (see FIG. 6) of a comparative example different from the non-contact power feeding apparatus 100 will be described.

  The basic configuration of the non-contact power supply apparatus 900 is the same as that of the non-contact power supply apparatus 100. In the non-contact power supply apparatus 900, the same components as those in the non-contact power supply apparatus 100 are denoted by the same reference numerals, and description and illustration are omitted as appropriate.

  In the non-contact power supply apparatus 900, the power supply unit 10 is disposed outside the housing 30 as illustrated in FIG. 6. The power supply unit 10 is electrically connected to the power supply coil 15 via, for example, a power cable (first power cable) 91.

  On the other hand, in the non-contact power supply apparatus 100, the power supply unit 10 is housed in the housing 30 (see FIG. 4). Therefore, in the non-contact power supply apparatus 100, the first power cable 91 of the non-contact power supply apparatus 900 is not necessary. As a result, in the non-contact power supply apparatus 100, it is possible to suppress unnecessary radiation noise generated in the first power cable 91 compared to the non-contact power supply apparatus 900. That is, in the non-contact power supply apparatus 100, it is possible to reduce noise compared to the non-contact power supply apparatus 900.

  In the non-contact power supply device 100, a voltage (line voltage of the second power cable) applied to a power cable (second power cable) that electrically connects the pair of input terminals 1A and 1B and the AC power source 400. Is the AC voltage of the commercial power supply. Thereby, in the non-contact electric power feeder 100, the general purpose power cable corresponding to the alternating voltage of the said commercial power supply can be used as a 2nd power supply cable, for example.

  Although all of the power supply unit 10 (the inverter circuit 12, the control circuit 13, and the capacitor 14) are housed in the housing 30, it is not limited to this configuration. For example, as shown in FIG. 7, a part (capacitor 14) of the power supply unit 10 may be accommodated in the housing 30. In this case, the capacitor 14 and the power supply coil 15 correspond to the target component. A series circuit 16 (see FIG. 7) of the capacitor 14 and the feeding coil 15 is electrically connected between the pair of input terminals 1A and 1B. The rectifying / smoothing circuit 11, the inverter circuit 12, and the control circuit 13 are disposed outside the housing 30. The inverter circuit 12 is electrically connected to the pair of input terminals 1A and 1B via, for example, a power cable (third power cable). Thereby, in the non-contact electric power feeder 100, the housing 30 can be downsized (thinned). Further, in the non-contact power supply apparatus 100, the current flowing through the third power cable is smaller than the current flowing through the first power cable 91 (see FIG. 6). Unwanted radiation noise generated in the power cable can be suppressed.

  Further, in the non-contact power supply apparatus 100, the voltage applied to the third power cable (line voltage of the third power cable) is determined from the voltage applied to the first power cable 91 in the non-contact power supply apparatus 900 of the comparative example. Can also be reduced. The voltage applied to the first power cable 91 is, for example, several kV. The voltage applied to the third power cable is, for example, several hundred volts. Therefore, in the non-contact power supply apparatus 100, a power cable having a lower withstand voltage than the first power cable 91 can be used as the third power cable.

  Further, in the non-contact power feeding device 100, as shown in FIG. 5, when the rectifying / smoothing circuit 11 is not provided, a power cable (fourth power source) for electrically connecting the pair of input terminals 1A, 1B and the rectifying / smoothing circuit 11 is provided. The voltage applied to the cable) (line voltage of the fourth power cable) becomes a DC voltage. Thereby, in the non-contact electric power feeder 100, the general purpose power cable corresponding to the said DC voltage can be used as a 4th power cable, for example.

  The target part includes the power supply unit 10 and the power supply coil 15, but may include a part of the power supply unit 10 and the power supply coil 15. Further, the target component may include only the feeding coil 15.

  The non-contact power supply apparatus 100 described above includes a power supply unit 10 that outputs an AC voltage, a power supply coil 15 that is supplied with the AC voltage in a non-contact manner, and a housing 30 that houses a target component including the power supply coil 15. It has. The housing 30 includes a base 31 to which the target part is attached and a cover 32 that covers the target part and is attached to the base 31. The base 31 has thermal conductivity and is formed in a plate shape. In the base 31, the target component is disposed on the first surface (upper surface 31a) in the thickness direction. The cover 32 is made of a nonmetallic material. The base 31 has a groove 33 formed on a second surface (lower surface 31b) opposite to the first surface in the thickness direction. Thereby, in the non-contact electric power feeder 100, the heat radiated to the base 31 can be released from the plurality of grooves 33. Therefore, in the non-contact power supply apparatus 100, for example, it is possible to improve heat dissipation as compared with the case where the groove portion 33 is not formed on the lower surface 31b of the base 31.

  The power supply unit 10 preferably includes an inverter circuit 12 that converts a DC voltage into the AC voltage, a control circuit 13 that controls the inverter circuit 12, and a capacitor 14 that forms a resonance circuit together with the feeding coil 15. Also in this non-contact power supply apparatus 100, the heat radiated to the base 31 can be released from the plurality of groove portions 33. Therefore, for example, compared with the case where the groove portion 33 is not formed on the lower surface 31b of the base 31, heat dissipation. Can be increased.

  The non-contact power feeding system 300 described above includes the non-contact power feeding device 100 and the non-contact power receiving device 200 that is fed from the non-contact power feeding device 100 in a non-contact manner. Thereby, in the non-contact electric power feeding system 300, the non-contact electric power feeding system using the non-contact electric power feeder 100 which can improve heat dissipation can be provided.

(Embodiment 2)
Below, the non-contact electric power feeder of Embodiment 2 is demonstrated based on FIG. The basic configuration of the contactless power supply device of the second embodiment is the same as that of the contactless power supply device 100 of the first embodiment. Further, the contactless power supply device of the second embodiment is different from the contactless power supply device 100 in the configuration of the groove 33. In the contactless power supply device of the second embodiment, the same components as those of the contactless power supply device 100 are denoted by the same reference numerals, and description and illustration are omitted as appropriate. Further, the non-contact power feeding apparatus of the second embodiment may be applied to the non-contact power feeding system 300 of the first embodiment, for example.

  The bottom surface of each of the plurality of groove portions 33 has a base 31 that extends from one end portion (left end portion in FIG. 9) in the longitudinal direction (left and right direction in FIG. 9) to the other end portion (right end portion in FIG. 9). It inclines so that the upper surface 31a may be approached. For example, the depth dimension of each of the plurality of groove portions 33 gradually increases from one end portion in the longitudinal direction toward the other end portion. Thereby, in the non-contact electric power feeder of Embodiment 2, it becomes possible to generate the airflow as shown by a dotted line with an arrow in FIG. Therefore, in the non-contact power feeding device of the second embodiment, it is possible to further improve the heat dissipation compared to the non-contact power feeding device 100 of the first embodiment.

  In the non-contact power feeding device according to the second embodiment, the depth dimension of each of the plurality of groove portions 33 gradually increases from one end portion to the other end portion in the longitudinal direction, but is not limited thereto. For example, the depth dimension of each of the plurality of groove portions 33 may increase stepwise from one end portion to the other end portion in the longitudinal direction.

  In the non-contact power feeding device of the second embodiment described above, the bottom surface of the groove portion 33 is inclined so as to approach the first surface (upper surface 31a) from one end portion in the longitudinal direction of the groove portion 33 toward the other end portion. Thereby, in the non-contact electric power feeder of Embodiment 2, since it becomes possible to generate an airflow in each of the some groove part 33, compared with the non-contact electric power feeder 100 of Embodiment 1, heat dissipation is improved more. It becomes possible.

(Embodiment 3)
Below, the non-contact electric power feeder 110 of Embodiment 3 is demonstrated based on FIG. The basic configuration of the contactless power supply apparatus 110 is the same as that of the contactless power supply apparatus 100 of the first embodiment. Further, as shown in FIGS. 10 and 11, the non-contact power supply apparatus 110 is different from the non-contact power supply apparatus 100 in that a cylindrical portion 36 is provided at the center of the cover 32. In the non-contact power supply apparatus 110 of the third embodiment, the same components as those in the non-contact power supply apparatus 100 are denoted by the same reference numerals, and description and illustration are omitted as appropriate. Moreover, the non-contact electric power feeder 110 may be applied to the non-contact electric power feeding system 300 of Embodiment 1, for example.

  A first opening hole 40 is provided at the center of the cover 32.

  The cylinder part 36 is formed in, for example, a rectangular cylinder (for example, a rectangular cylinder). The cylindrical portion 36 has a second opening hole 37. The cylindrical portion 36 is provided in the center portion of the cover 32 so that the second opening hole 37 communicates with the first opening hole 40 of the cover 32. Further, the cylindrical portion 36 is disposed inside the power supply coil 15.

  The inner dimension (inner dimension) W1 of the feeding coil 15 in the horizontal direction (left and right direction in FIG. 10) is larger than the outer dimension (outer dimension) W2 of the cylindrical portion 36 in the horizontal direction. The feeding coil 15 is accommodated in the housing 30 so that the central axis C1 of the feeding coil 15 and the central axis C2 of the cylindrical portion 36 coincide with each other.

  In the non-contact power feeding device 110, the cylindrical portion 36 is provided in the center portion of the cover 32, so that, for example, heat radiated to the base 31 can be discharged from the second opening hole 37 of the cylindrical portion 36. Become. Therefore, in the non-contact power feeding device 110 of the third embodiment, it is possible to further improve the heat dissipation compared to the non-contact power feeding device 100 of the first embodiment.

  In addition, although the cylinder part 36 is formed in the rectangular cylinder shape, it is not restricted to this shape, For example, you may be formed in the cylindrical shape.

  The non-contact power supply apparatus 110 may include the configuration of the groove portion 33 (see FIGS. 8 and 9) described in the non-contact power supply apparatus of the second embodiment. Thereby, in the non-contact electric power feeder 110 of Embodiment 3, compared with the non-contact electric power feeder 100 of Embodiment 1, it becomes possible to improve heat dissipation further.

  In the non-contact power supply apparatus 110 described above, the power supply coil 15 is a spiral coil. A cylindrical portion 36 having a first opening hole 40 and a second opening hole 37 communicating with the first opening hole 40 is provided at the center of the cover 32. The cylindrical portion 36 is disposed inside the power supply coil 15. The feeding coil 15 is accommodated in the housing 30 so that the central axis C1 of the feeding coil 15 and the central axis C2 of the cylindrical portion 36 coincide. Thereby, in the non-contact power feeding apparatus 110, for example, heat radiated to the base 31 can be released from the second opening hole 37 of the cylindrical portion 36. Therefore, in the non-contact power feeding device 110 of the third embodiment, it is possible to further improve the heat dissipation compared to the non-contact power feeding device 100 of the first embodiment.

(Embodiment 4)
Below, the non-contact electric power feeder 120 of Embodiment 4 is demonstrated based on FIG. The basic configuration of the contactless power supply device 120 is the same as that of the contactless power supply device 110 of the third embodiment. Further, as shown in FIG. 12, the non-contact power feeding device 120 is different from the non-contact power feeding device 110 in that a third opening hole 38 is provided in the central portion of the base 31. In the non-contact power feeding device 120 of the fourth embodiment, the same components as those of the non-contact power feeding device 110 are denoted by the same reference numerals, and description and illustration are omitted as appropriate. Moreover, the non-contact electric power feeder 120 may be applied to the non-contact electric power feeding system 300 of Embodiment 1, for example.

  The third opening hole 38 is formed in the base 31 so as to communicate with the second opening hole 37 of the cylindrical portion 36. Thereby, in the non-contact power feeding device 120, for example, the heat radiated to the base 31 can be released from the second opening hole 37 of the cylindrical portion 36 through the third opening hole 38. Therefore, in the non-contact power feeding device 120 of the fourth embodiment, similarly to the non-contact power feeding device 110 of the third embodiment, it is possible to further improve heat dissipation compared to the non-contact power feeding device 100 of the first embodiment. . The third opening hole 38 is preferably formed in the base 31 so that the center axis C3 of the third opening hole 38 and the center axis C2 of the cylindrical portion 36 coincide with each other.

  The third opening hole 38 is preferably formed so that the inner surface of the third opening hole 38 and the inner surface of the second opening hole 37 of the cylindrical portion 36 are flush with each other. Thereby, in the non-contact electric power feeder 120, it becomes possible to suppress that a foreign material accumulates on the upper surface 31a of the base 31, for example. As a result, in the non-contact power feeding device 120 of the fourth embodiment, it is possible to further improve the heat dissipation compared to the non-contact power feeding device 110 of the third embodiment.

  In the non-contact power feeding device 120 described above, the third opening hole 38 that communicates with the second opening hole 37 of the cylindrical portion 36 is provided in the central portion of the base 31. Thereby, in the non-contact power feeding device 120, for example, the heat radiated to the base 31 can be released from the second opening hole 37 of the cylindrical portion 36 through the third opening hole 38. Therefore, in the non-contact power feeding device 120 of the fourth embodiment, similarly to the non-contact power feeding device 110 of the third embodiment, it is possible to further improve heat dissipation compared to the non-contact power feeding device 100 of the first embodiment. .

(Embodiment 5)
Below, the non-contact electric power feeder 130 of Embodiment 5 is demonstrated based on FIG. The basic configuration of the non-contact power supply apparatus 130 is the same as that of the non-contact power supply apparatus 110 of the third embodiment. Further, as shown in FIG. 13, the non-contact power feeding device 130 is different from the non-contact power feeding device 110 in that at least one of the plurality of electronic components 3 is thermally coupled to the base 31. Is different. In the non-contact power feeding device 130 of the fifth embodiment, the same components as those in the non-contact power feeding device 110 are denoted by the same reference numerals, and description and illustration are omitted as appropriate. Moreover, the non-contact electric power feeder 130 may be applied to the non-contact electric power feeding system 300 of Embodiment 1, for example.

  The electronic component 3 that is thermally coupled to the base 31 is, for example, an electronic component that generates a relatively large amount of heat. An electronic component that generates a relatively large amount of heat is, for example, a switching element such as an inverter circuit 12 (for example, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or the like). Hereinafter, for convenience of explanation, the electronic component 3 that is thermally coupled to the base 31 may be referred to as a high heat generating component 3a.

  The high heat generating component 3 a is disposed on the upper surface 31 a of the base 31 with the insulating member 5 interposed therebetween.

  In the non-contact power supply device 130, since the high heat-generating component 3a is thermally coupled to the base 31, it is possible to improve heat dissipation as compared with the non-contact power supply device 110 of the third embodiment.

  In addition, the non-contact electric power feeder 130 may be provided with the 3rd opening hole 38 (refer FIG. 12) of the base 31 demonstrated with the non-contact electric power feeder 120 of Embodiment 4. FIG.

  In the non-contact power supply apparatus 130 described above, the target component further includes at least a part of the power supply unit 10. The power supply unit 10 includes a plurality of electronic components 3. At least one electronic component 3 (high heat-generating component 3 a) among the plurality of electronic components 3 is thermally coupled to the base 31. Thereby, in the non-contact electric power feeder 130, compared with the non-contact electric power feeder 110 of Embodiment 3, it becomes possible to improve heat dissipation.

(Embodiment 6)
Below, the non-contact electric power feeder 140 of Embodiment 6 is demonstrated based on FIG. The basic configuration of the contactless power supply device 140 is the same as that of the contactless power supply device 100 of the first embodiment. Further, as shown in FIG. 14, the non-contact power supply apparatus 140 is different from the non-contact power supply apparatus 100 in that a convex portion 39 is provided on the side surface 31 c of the base 31. Note that in the non-contact power supply apparatus 140 of Embodiment 6, the same reference numerals are assigned to the same components as those of the non-contact power supply apparatus 100, and description and illustration are omitted as appropriate. Moreover, the non-contact electric power feeder 140 may be applied to the non-contact electric power feeding system 300 of Embodiment 1, for example.

  For example, the non-contact power feeding device 140 is embedded in a hole (embedded hole) 610 formed in the ground 600.

  For example, a plurality of convex portions 39 are provided on the side surface 31 c of the base 31. To explain with an example, a plurality of convex portions 39 are provided on the side surface 31c of the base portion 31 in the longitudinal direction (left and right direction in FIG. 14) of the groove portion 33. Thereby, in the non-contact power feeding device 140, when the non-contact power feeding device 140 is embedded in the embedded hole 610, a gap 620 is formed between the side surface 31c of the base 31 and the inner side surface of the embedded hole 610. It becomes possible. Therefore, in the non-contact power supply device 140, for example, when the embedded portion is embedded in the embedded hole 610, it is possible to improve heat dissipation as compared with the case where the convex portion 39 is not formed on the side surface 31c of the base 31.

  In addition, although the some convex part 39 is provided in the side surface 31c of the base 31, the one convex part 39 may be provided.

  In the non-contact power feeding device 140 described above, the convex portion 39 is provided on the side surface 31 c of the base 31. Thereby, in the non-contact power feeding device 140, when the non-contact power feeding device 140 is embedded in the embedded hole 610, a gap 620 is formed between the side surface 31c of the base 31 and the inner side surface of the embedded hole 610. It becomes possible. Therefore, in the non-contact power supply device 140, for example, when the embedded portion is embedded in the embedded hole 610, it is possible to improve heat dissipation as compared with the case where the convex portion 39 is not formed on the side surface 31c of the base 31.

  The power supply coil 15 and the power reception coil 21 of Embodiments 1 to 6 are spiral coils. Therefore, the non-contact power feeding devices 100, 110, 120, 130, and 140 according to the first to sixth embodiments have an advantage that unnecessary radiation noise is less likely to occur than when a solenoid coil is used as the power feeding coil 15. Moreover, in the non-contact electric power feeder 100,110,120,130,140 of Embodiment 1-6, as a result of reducing unnecessary radiation noise, the advantage that the range of the operating frequency which can be used in the inverter circuit 12 is expanded. There is also. Hereinafter, this point will be described in detail.

  The resonance characteristic of the non-contact power feeding system 300 changes according to the coupling coefficient between the power feeding coil 15 and the power receiving coil 21, and under certain conditions, two maximum values are generated in the output as shown in FIG. Show properties. In this resonance characteristic (bimodal characteristic), as shown in FIG. 15, two “mountains” in which the output is maximized at each of the first frequency fr1 and the third frequency fr3 are generated. Between these two “mountains”, a “valley” in which the output is minimized at the second frequency fr2 occurs. Here, the first frequency fr1, the second frequency fr2, and the third frequency fr3 are in a relationship of fr1 <fr2 <fr3. Hereinafter, on the basis of the second frequency fr2, a frequency region lower than the second frequency fr2 is referred to as a “low frequency region”, and a frequency region higher than the second frequency fr2 is referred to as a “high frequency region”.

  In such a resonance characteristic, each of a “mountain” in the low-frequency region (a mountain that becomes maximum at the first frequency fr1) and a “mountain” in the high-frequency region (a mountain that becomes maximum at the third frequency fr3). In addition, a region where the inverter circuit 12 operates in the slow phase mode (hereinafter referred to as “slow phase region”) occurs. Therefore, the inverter circuit 12 can operate in the slow phase mode even when the operating frequency f1 is at any of the two “mountains”.

  Here, when the operating frequency f1 of the inverter circuit 12 is in the “mountain” of the low frequency region and the case of being in the “mountain” of the high frequency region, the case where the operating frequency f1 is in the “mountain” of the low frequency region is better. Unnecessary radiation noise is reduced. That is, in the “mountain” of the high frequency region, the current flowing through the feeding coil 15 and the current flowing through the receiving coil 21 are in phase. On the other hand, in the “mountain” of the low frequency region, the current flowing through the feeding coil 15 and the current flowing through the receiving coil 21 are in opposite phases. Therefore, in the “mountains” in the low frequency region, the unnecessary radiation noise generated in the power feeding coil 15 and the unnecessary radiation noise generated in the power receiving coil 21 cancel each other. Unwanted radiation noise is reduced.

  Therefore, in the non-contact power feeding devices 100, 110, 120, 130, and 140 of the first to sixth embodiments, even when a solenoid coil is used as the power feeding coil 15, the operating frequency f1 of the inverter circuit 12 is a “mountain” in a low frequency region. In the slow phase region (fr1 to fr2), the inverter circuit 12 operates in the slow phase mode, and unnecessary radiation noise is reduced. However, when the solenoid coil is used as the power feeding coil 15 in the contactless power feeding devices 100, 110, 120, 130, and 140 of the first to sixth embodiments, the slow phase region of the “mountain” in the low frequency region is the power feeding coil 15. Therefore, it is necessary to control the operation frequency f1 of the inverter circuit 12 in such an indefinite slow phase region.

  On the other hand, in the non-contact power feeding devices 100, 110, 120, 130, and 140 of the first to sixth embodiments, since the spiral coil is used as the power feeding coil 15, the operating frequency f1 of the inverter circuit 12 is in the high frequency region. Even in the “mountain” slow-phase region (higher frequency than fr3), unnecessary radiation noise is greatly reduced as compared with the case where a solenoid coil is used as the feeding coil 15. That is, in the non-contact power feeding devices 100, 110, 120, 130, and 140 according to the first to sixth embodiments, the spiral coil is used as the power feeding coil 15, so that the operating frequency f1 of the inverter circuit 12 is a “mountain” in the low frequency region. The range of the operating frequency f1 usable in the inverter circuit 12 is expanded without being limited to the slow phase region. Although the slow phase region of the “mountain” in the high frequency region is also an uncertain region, if the operating frequency f1 of the inverter circuit 12 is swept from a sufficiently high frequency to a low frequency side, the operating frequency f1 is “ Since it passes through the lagging region of the mountain, complicated control is unnecessary.

  The above-described embodiment is merely an example of the present invention, and the present invention is not limited to the above-described embodiment, and other embodiments may be used as long as they do not depart from the technical idea according to the present invention. Various changes can be made according to the design and the like.

DESCRIPTION OF SYMBOLS 3 Electronic component 4 Board | substrate 10 Power supply part 11 Rectification smoothing circuit 12 Inverter circuit 13 Control circuit 14 Capacitor 15 Feeding coil 30 Case 31 Base 31a Upper surface (1st surface)
31b Lower surface (second surface)
31c Side surface 32 Cover 33 Groove portion 36 Tube portion 37 Second opening hole 38 Third opening hole 39 Projection portion 40 First opening hole 100 Non-contact power supply device 110 Non-contact power supply device 120 Non-contact power supply device 130 Non-contact power supply device 140 Non-contact Power feeding device 200 Contactless power receiving device 300 Contactless power feeding system

Claims (8)

A power supply unit that outputs an AC voltage; a power supply coil that is supplied with the AC voltage in a contactless manner; and a housing that houses a target component including the power supply coil.
The housing includes a base to which the target part is attached, and a cover that covers the target part and is attached to the base.
The base has thermal conductivity and is formed in a plate shape, and the target component is disposed on the first surface in the thickness direction,
The cover is formed of a non-metallic material;
The non-contact power feeding device, wherein the base has a groove formed on a second surface opposite to the first surface in the thickness direction. The power supply unit includes an inverter circuit that converts a DC voltage into the AC voltage, a control circuit that controls the inverter circuit, and a capacitor that forms a resonance circuit together with the feeding coil. The non-contact power feeding device according to 1. 3. The non-contact power feeding according to claim 1, wherein a bottom surface of the groove portion is inclined so as to approach the first surface from one end portion in the longitudinal direction of the groove portion toward the other end portion. apparatus. The feeding coil is a spiral coil,
A central portion of the cover is provided with a first opening hole and a cylindrical portion having a second opening hole communicating with the first opening hole,
The cylindrical portion is disposed inside the feeding coil,
The power feeding coil is housed in the housing so that a central axis of the power feeding coil and a central axis of the cylindrical portion coincide with each other. The non-contact electric power feeder as described in. The non-contact power feeding device according to claim 4, wherein a third opening hole communicating with the second opening hole of the cylindrical portion is provided at a central portion of the base. The target component further includes at least a part of the power supply unit,
The power supply unit has a plurality of electronic components,
6. The contactless power supply device according to claim 1, wherein at least one electronic component among the plurality of electronic components is thermally coupled to the base. 6. The non-contact power feeding device according to any one of claims 1 to 6, wherein a convex portion is provided on a side surface of the base. A non-contact power feeding device comprising: the non-contact power feeding device according to any one of claims 1 to 7; and a non-contact power receiving device that is fed in a non-contact manner from the non-contact power feeding device. system.

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