JP2014096917A - Non-contact power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power supply which prevents a fastening bolt of a lid of a power supply part from being detached from outside, thus capable of enhancing safety.SOLUTION: In a state where a synthetic resin-made lid 124 is fixed on a lid fixing part 125 of a box cross section formed on the periphery of an aperture of a protective housing 123, a bolt 128 is engaged, fastened, and fixed to a nut member 129 embedded in the lid 124 on the back of the lid fixing part 125. Accordingly, in a state where a coil body (power supply part) 12 is installed on a road surface of a parking space 2, the bolt 128 cannot be detached from outside and thus safety can be enhanced.

Description

  The present invention relates to a non-contact power supply apparatus that performs non-contact power supply to a vehicle such as an electric vehicle.

  In Patent Document 1, a primary coil is provided as a power feeding unit on the road surface of a parking space, a secondary coil is provided as a power receiving unit on the lower surface of the vehicle floor, and power is supplied from the primary coil to the secondary coil by electromagnetic induction. A technique is disclosed in which a battery mounted on a vehicle is charged with power received by the secondary coil.

JP 2010-226945 A

  The opposing protective casing surfaces of the primary coil and the secondary coil are made of a synthetic resin material so as not to interfere with the electromagnetic induction region.

  Specifically, each is composed of a protective housing that houses a coil body and a synthetic resin lid that closes an opening corresponding to the coil body of the protective housing, many of which Is formed by superimposing the periphery of the lid on the periphery of the opening of the protective housing, and fastening and fixing it with bolts and nuts in the vertical direction.

  However, in such a fastening structure of the lid body with bolts and nuts, the bolt head protrudes from the outer surface of the lid body. Therefore, in particular, in the primary coil (feeding portion) installed on the road surface, the bolt is mischievous. It may be removed, and it cannot be said that it looks good in appearance.

  Therefore, the present invention provides a non-contact power feeding device that can enhance the safety without removing the bolt that fastens and fixes the lid body to the protective housing of the power feeding unit arranged on the road surface. is there.

  The non-contact power supply apparatus of the present invention is basically configured to supply power to a vehicle in a non-contact manner by magnetic coupling between a power supply unit installed in a parking space and a power receiving unit mounted on the vehicle.

  The above-described power supply unit includes a coil body for power transmission, a protective housing that houses the coil body, and a synthetic resin lid that closes an opening corresponding to the coil body of the protective housing. ing.

  And this protective housing is provided with a lid stationary part with a box cross-section with the lower side open at the periphery of the opening, and the lid is placed in a state where the peripheral part of the lid is stationary on the lid stationary part. The main feature is that it is fastened and fastened by fastening means on the back side of the body placement portion.

  According to the present invention, the lid body is fastened and fixed by the fastening means on the back side of the lid body stationary portion in a state where the lid body is placed on the lid stationary portion of the box cross section formed at the periphery of the opening of the protective housing. In a state where the power feeding unit is installed on the road surface, the fastening means cannot be removed from the outside, and the safety can be improved.

Explanatory drawing which shows schematically the non-contact electric power feeder which concerns on this invention. FIG. 3 is a schematic cross-sectional explanatory diagram of a power feeding unit. The enlarged view of the A range part of FIG. 2 which shows 1st Embodiment of the fastening structure of a protection housing | casing and a cover body. The enlarged view similar to FIG. 3 which shows 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The non-contact power feeding device of the present embodiment shown in FIG. 1 includes a power feeding device 100 that is a ground side unit and a power receiving device 200 that is a vehicle side unit. Electric power is supplied in a non-contact manner to a power receiving device 200 mounted on a vehicle 1 typified by an automobile or a hybrid vehicle, and the vehicle battery 27 is charged.

  The power feeding device 100 includes a power feeding unit 12 installed in the parking space 2 near the power feeding stand, and the power receiving device 200 faces the power feeding unit 12 when the vehicle 1 is stopped at a predetermined position in the parking space 2. The power receiving unit 22 is provided on the bottom surface of the battery.

  A power transmission coil mainly composed of a primary coil made of a conductive wire is used as the power supply unit 12, and a power reception coil mainly composed of a secondary coil made of the same conductive wire is used as the power receiving unit 22, and electromagnetic induction between both coils is used. By the action, electric power can be supplied from the power transmission coil 12 to the power reception coil 22 in a non-contact manner.

  The ground-side power supply device 100 includes a power control unit 11, a power transmission coil 12, a wireless communication unit 13, and a control unit 14.

  The power control unit 11 is a circuit for converting AC power transmitted from the AC power source 300 into high-frequency AC power and transmitting the AC power to the power transmission coil 12. The rectification unit 111, the PFC circuit 112, the inverter 113, Sensor 114. The rectifying unit 111 is a circuit that is electrically connected to the AC power supply 300 and rectifies the output AC power from the AC power supply 300. The PFC circuit 112 is a circuit (Power Factor Correction) for improving the power factor by shaping the output waveform from the rectifying unit 111, and is connected between the rectifying unit 111 and the inverter 113.

  The wireless communication unit 13 performs bidirectional communication with the wireless communication unit 23 provided on the vehicle 1 side.

  The control unit 14 is a part that controls the entire power supply apparatus 100, and transmits a signal to the vehicle 1 side to start power supply from the power supply apparatus 100 through communication between the wireless communication units 13 and 23, or the vehicle 1. A signal indicating that the power from the power supply apparatus 100 is to be received is received from the side.

  In addition to this, the control unit 14 performs switching control of the inverter 113 based on the detection current of the sensor 114 to control the power transmitted from the power transmission coil 12. Further, during power feeding, based on the detection signal from the foreign matter sensor 3, power feeding is stopped or a warning signal is transmitted to the vehicle 1 side through the wireless communication units 13 and 23.

As the foreign object sensor 3, for example, a metal detection coil is used. When a metal foreign object enters or intervenes in a magnetic field formed between the power transmission coil 12 and the power reception coil 22 during power feeding, the detection of the foreign object detection sensor 3 is performed. The controller 14 prompts the controller 14 to promptly stop the power supply or stop the power supply, thereby preventing the occurrence of a problem such as a power supply failure due to the intervening magnetic field of the metal foreign object.

  The power receiving device 200 on the vehicle 1 side includes a power receiving coil 22, a wireless communication unit 23, a charging control unit 24, a rectifying unit 25, a relay unit 26, a battery 27, an inverter 28, a motor 29, and a notification unit. 30.

  The power receiving coil 22 is provided between the left and right rear wheels W on the bottom surface (chassis) or the like of the vehicle 1 as described above, and the vehicle 1 is guided and regulated to a predetermined position in the parking space 2 by a parking guidance regulating means (not shown). When the vehicle is parked, it faces directly above the power transmission coil 12 and is positioned with a distance from the power transmission coil 12.

  The rectification unit 25 is connected to the power reception coil 22 and is configured by a rectification circuit that rectifies AC power received by the power reception coil 22 into direct current.

  The relay unit 26 includes a relay switch that is switched on and off under the control of the charging control unit 24. Moreover, the relay part 26 isolate | separates the strong electric system containing the battery 27, and the receiving coil 22 used as the circuit part of charge, and the weak electric system of the rectification | straightening part 25 by turning off a relay switch.

  The battery 27 is configured by connecting a plurality of secondary batteries, and serves as a power source for the vehicle 1. The inverter 28 is a control circuit such as a PWM control circuit having a switching element such as an IGBT, and based on the switching control signal, the DC power output from the battery 27 is converted into AC power and supplied to the motor 29. The motor 29 is composed of, for example, a three-phase AC motor and serves as a drive source for driving the vehicle 1.

  The notification unit 30 is configured by a warning lamp, a display of a navigation system, a speaker, or the like, and outputs light, an image, a sound, or the like to the user based on the control by the charging control unit 24.

  The charging control unit 24 is a controller for controlling the charging of the battery 27, and controls the wireless communication unit 23, the notification unit 30, the relay unit 26, and the like. The charging control unit 24 transmits a signal to start charging to the control unit 14 through communication of the wireless communication units 23 and 13. The charging control unit 24 is connected to a controller (not shown) that controls the entire vehicle 1 through a CAN communication network. This controller manages the switching control of the inverter 28 and the state of charge (SOC) of the battery 27. Then, when the controller reaches the full charge based on the charge state of the battery 27, the charge control unit 24 transmits a signal to the control unit 14 to end the charge.

  Therefore, in the non-contact power feeding device of the present embodiment, high-frequency power is transmitted and received between the power transmission coil 12 and the power receiving coil 22 in a non-contact state by electromagnetic induction action. In other words, when a voltage is applied to the power transmission coil 12, magnetic coupling occurs between the power transmission coil 12 and the power reception coil 22, and power is supplied from the power transmission coil 12 to the power reception coil 22.

  Here, the respective protective casing surfaces of the power transmission coil 12 and the power receiving coil 22 described above are made of a synthetic resin material so as not to interfere with the electromagnetic induction region.

  2 and 3 show the power transmission coil 12 installed on the road surface of the parking space 2 described above.

The power transmission coil 12 includes a coil main body 121 for power transmission, an insulating substrate 122 on which the coil main body 121 is placed, a metal protective casing 123 storing the coil main body 121 and the insulating substrate 122, and a protective casing 123. And a synthetic resin lid body 124 having an opening corresponding to the coil body 121 closed.

  The protective housing 123 is formed in a substantially tray shape, and is formed as a box cross-section with the lower side open at the periphery of the opening, and a lid body placement portion 125 having a placement surface 125b for placing the lid body. It is formed.

  And the peripheral part of the above-mentioned cover body 124 is fastened and fixed by a fastening means on the back side of the cover body placing part 125 in a state where it is placed on the placing surface 125b of the lid body placing part 125.

  In the example shown in FIG. 3, the nut member 129 embedded in the thickness of the lid body 124 as the fastening means and opened on the back surface side of the lid body 124, and the attachment hole 125 a provided in the lid body placement portion 125 are inserted from the back surface side. Bolts 128 (through) and screwed to the nut member 129 are used.

  The nut member 129 has a height corresponding to the plate thickness of the lid body 124 and is embedded in alignment with the front and back surfaces of the lid body 124, and the upper end side is a so-called closed screw hole. It is configured as a blind nut.

  Further, the nut member 129 has an annular groove formed on the outer periphery of the trunk portion thereof, and the resin material enters the annular groove by insert molding to the lid 124 so that an organic coupling state is obtained. Yes.

  Here, in this embodiment, the lid body 124 protrudes from the outer periphery of the lid body fixing portion 125 at a height corresponding to the thickness of the lid body 124 and surrounds the lid body 124 close to the circumferential side thereof. A bulging portion 126 is formed.

  A drainage groove 127 having a drain hole 127a at the groove bottom is formed in a continuous portion of the bulging portion 126.

  In the present embodiment, the harness connector 131 for energizing the coil body 121 is attached to the inner peripheral wall of the protective housing 123 as shown in FIG. It is arranged in.

  According to the non-contact power feeding device of the present embodiment configured as described above, the power transmission coil 12 is exposed on the road surface of the parking space 2, but the synthetic resin lid body 124 is an opening of the protective housing 123. It is fastened and fixed by bolts 128 and nut members 129 on the back side of the lid placing portion 125 in a state of being placed on the lid placing portion 125 having a box cross section formed on the periphery.

  For this reason, in the state where the power transmission coil 12 is installed on the road surface, it is possible to prevent the bolt 128 and the nut member 129 from being illegally released from the outside, and to improve the safety.

  In particular, in this embodiment, the nut member 129 is embedded in the thickness of the lid body 124, and the bolt 128 is screwed and fastened to the nut member 129 within the box cross section of the lid body placement portion 125.

  For this reason, a protrusion part does not arise on the surface of the cover body 124, and appearance can be made favorable in appearance. In addition, since no protrusion is generated on the back surface side of the lid 124, the plurality of lids 124 can be stacked and managed on the assembly line of the power transmission coil 12, and parts management can be facilitated.

  On the other hand, the lid placing portion 125 has a bulging portion 126 that protrudes at a height corresponding to the thickness of the lid 124 and surrounds the lid 124 close to the circumferential side thereof. The bulging portion 126 functions as a protector at the peripheral edge of the lid 124 and can be protected from external input.

  Further, since the bulging portion 126 can prevent the direct discharge of strong water discharge to the periphery of the overlapping portion between the lid body 124 and the lid body fixing portion 125, it is advantageous in terms of waterproofing. When raining or watering, water intrusion into the gap between the peripheral edge of the lid 124 and the bulging portion 126 is unavoidable, but this intruding water is captured by the drain groove 127 at the continuous portion of the bulging portion 126. And since it can drain from the drain hole 127a as a drain outlet provided in the groove bottom, a waterproof effect can be improved further.

In addition, as a drain outlet, it can also be set as the structure which extends the drain groove 127 to the outer periphery of the bulging part 126, and drains to the outer periphery of the protective housing 123 instead of the drain hole 127a.

  Furthermore, since the harness connector 131 is disposed within the box cross section of the lid fixing portion 125 described above, the harness connector 131 can be protected from external input and direct water discharge, and the safety can be further improved.

  Further, as described above, the protective casing 123 has a box cross-sectional structure formed by the lid fixing portion 125 so that the strength and rigidity of the protective casing 125 can be increased, and the severe use that is exposed to the riding of a wheel, etc. It can cope with the conditions sufficiently.

  FIG. 4 shows a second embodiment of the present invention.

  A mounting hole 124a stiffened by an insert-molded metal collar 130 is formed in the peripheral portion of the lid 124.

  The lid 124 is placed in a tool engagement with the mounting hole 124 a and the mounting hole 125 a of the lid fixing portion 125 with the peripheral edge thereof being fixed on the lid fixing portion 125 on the periphery of the opening of the protective housing 123. A low-head bolt 128A having no joint portion is inserted (penetrated), and a nut 129A is screwed and fastened to the rear side of the lid fixing portion 125, that is, the protruding end portion of the bolt 128A within the box cross section.

  Therefore, according to the structure of the second embodiment, the same effects as those of the first embodiment can be obtained, and a general-purpose low head bolt 128A and a nut 129A can be used as fastening means, which is advantageous in terms of cost. Can get to.

  The structures of the first and second embodiments can be applied to the power receiving coil (power receiving unit) 22.

DESCRIPTION OF SYMBOLS 1 ... Car body 2 ... Parking space 12 ... Power transmission coil (power feeding part)
22 ... Power receiving coil (power receiving unit)
121 ... Coil body 122 ... Insulating substrate 123 ... Protective housing 124 ... Lid 125 ... Lid fixing part 126 ... Swelling part 127 ... Drainage groove 128 ... Bolt (fastening means)
129 ... Nut member (fastening means)
128A ... Low head bolt (fastening means)
129A ... nut (fastening means)
131 ... Harness connector

Claims (6)

In a non-contact power feeding device that supplies power to a vehicle in a non-contact manner by magnetic coupling between a power feeding unit installed in a parking space and a power receiving unit mounted on the vehicle,
The power supply unit includes a coil body for power transmission, a protective housing that stores the coil body, and a synthetic resin lid that closes an opening corresponding to the coil body of the protective housing,
The protective housing includes a lid-fixing portion having a box cross section whose lower side is open at the periphery of the opening,
A non-contact power feeding apparatus, wherein a peripheral portion of the lid is fixed on a back side of the lid fixing portion by a fastening means in a state of being fixed on the lid fixing portion. The fastening means is a nut member embedded in the thickness of the lid and opened on the back side of the lid;
The contactless power feeding device according to claim 1, comprising: a bolt that penetrates from the back side of the lid fixing portion and is screwed and fastened to the nut member. The fastening means is a low-head bolt without a tool engaging part, which is disposed through the lid and the lid stationary part from above,
The non-contact power feeding device according to claim 1, comprising a nut screwed and fastened to a protruding end portion of the bolt on the back side of the lid fixing portion.   The said lid body fixing | fixed part is provided with the bulging part which protrudes by the height equivalent to the thickness of the said lid body, and surrounds this lid body adjacent to the surrounding side. The non-contact electric power feeder as described in any one of these.   The non-contact power feeding device according to claim 4, wherein the lid fixing portion includes a drainage groove in a continuous portion of the bulging portion.   The non-contact power feeding device according to claim 1, wherein the protective housing includes a harness connector that energizes the coil body in an internal space of the lid body stationary portion.

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