JP2015164362A - Power reception unit and power supply system including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power reception unit which prevents a metal foreign object from hooking on a portion where a housing of the power reception unit is fixed to a vehicle by a bolt, and to provide a power supply system including the power reception unit.SOLUTION: A power supply system includes: a power supply device disposed on a ground surface; and a power reception device disposed at a vehicle V. A power reception unit 32 of the power reception device includes: a power reception side coil; a power reception side capacitor body; a power reception side case 35 which houses the power reception side coil and the power reception side capacitor body; and a pair of covers 4 made of a non-metal material. Fixing parts 39 which are fixed to a lower surface of the vehicle V by bolts are provided on both side surfaces 36b, 36c of the power reception side case 35. The pair of covers 4 covers the fixing parts 39 of the side surfaces 36b, 36c and the bolts 5. A lower surface 4a of the cover 4 continues into a lower surface 36a of the power reception side case 35 so as to be flush with the lower surface 36a.

Description

  The present invention relates to a power receiving unit that is provided in a vehicle and receives power supplied from the outside of the vehicle in a contactless manner, and a power feeding system having the power receiving unit.

  In recent years, for example, charging of a secondary battery (hereinafter simply referred to as a “power battery”) included in a plug-in hybrid vehicle (PHEV), an electric vehicle (EV), or the like is performed by using a plug connection. Wireless (non-contact) power transmission technology that does not require physical connection such as the above is used.

  For example, in the power feeding system disclosed in Patent Document 1, one of a pair of coils that electromagnetically resonate with each other is installed on the ground of the power feeding equipment, and the other is mounted on the vehicle, and the power feeding side installed on the ground of the power feeding equipment Electric power is supplied in a non-contact manner from a coil to a power receiving coil mounted on the vehicle. In such a power feeding system, the power receiving coil is usually housed in a casing together with components such as a capacitor. The casing is bolted to the lower surface of the vehicle.

JP 2013-90470 A

  However, in the above-described structure in which the casing containing the power receiving coil is fixed to the lower surface of the vehicle with a bolt, there is a problem that a foreign matter on the road surface or a foreign matter blown off by the wind may be caught near the bolt. In addition, if the foreign object is a metal such as an empty can or a metal foil, and power supply is started while the metal foreign object is caught, the metal foreign object may generate heat and affect the operation and performance of the power supply system. There was a problem that there was.

  In addition, there is no sensor that can detect a metallic foreign object existing in the space between the ground of the power supply facility and the lower surface of the vehicle, and it is difficult to find a state where the metallic foreign object is caught near the bolt.

  The present invention aims to solve this problem. That is, an object of the present invention is to provide a power receiving unit capable of preventing a metal foreign object from being caught on a portion where the casing of the power receiving unit is bolted to a vehicle, and a power feeding system having the power receiving unit.

  In order to achieve the above object, the invention described in claim 1 is a power receiving unit that is provided on a lower surface of a vehicle and receives power transmitted from a power feeding unit provided on the ground in a non-contact manner. The power receiving unit is provided with a fixing portion that is bolted to the vehicle, covers at least the fixing portion, and has a non-metallic cover that is attached to the housing or the vehicle. Power receiving unit.

  The invention described in claim 2 is the invention described in claim 1, wherein the cover is positioned on a side of the housing, and a lower surface of the cover is continuously flush with a lower surface of the housing. It is characterized by being.

  According to a third aspect of the present invention, in the first aspect of the present invention, the cover is provided so as to shield the entire casing from the lower surface of the vehicle. It is.

  In order to achieve the above object, the invention described in claim 4 includes a power feeding unit provided on the ground and a power receiving unit provided on the vehicle, and the power receiving unit transmits power transmitted from the power feeding unit. A power supply system that receives power in a non-contact manner, wherein the power reception unit includes the power reception unit according to any one of claims 1 to 3.

  According to the first and fourth aspects of the present invention, the housing of the power receiving unit is provided with a fixing portion that is bolted to the vehicle, covers at least the fixing portion, and is attached to the housing or the vehicle. Since the non-metallic cover is provided, it is possible to prevent metal foreign objects from being caught in the vicinity of the fixing portion and the bolt.

  According to the invention described in claim 2, since the cover is positioned on the side of the casing, and the lower surface of the cover is continuous with the lower surface of the casing, the lower surface of the cover and the casing It is difficult for metal foreign objects to get caught at the boundary of the lower surface.

  According to the invention described in claim 3, since the cover is provided so as to shield the entire casing from the lower surface of the vehicle, not only the vicinity of the fixing portion and the bolt but also the casing No metal foreign matter is caught on any of these parts.

It is a figure which shows schematic structure of the power receiving unit and electric power feeding system concerning the 1st Embodiment of this invention. It is a figure explaining arrangement | positioning of the electric power feeding unit and power receiving unit in the electric power feeding system of FIG. FIG. 3 is a cross-sectional view of the power receiving unit in FIG. 2. It is sectional drawing of the power receiving unit concerning the 2nd Embodiment of this invention.

(First embodiment)
A power receiving unit and a power feeding system according to a first embodiment of the present invention will be described with reference to FIGS.

  The power feeding system of this embodiment supplies electric power to the vehicle from the ground side in a non-contact manner using a magnetic field resonance method. A method other than the magnetic field resonance method may be used as long as power is transmitted by electromagnetically coupling the power feeding side and the power receiving side.

  As shown in FIG. 1, the power feeding system 1 includes a power feeding device 20 as a power feeding unit arranged on the ground G (shown in FIG. 2) and a power receiving unit as a power receiving unit arranged in a vehicle V (shown in FIG. 2). Device 30. The vehicle V includes a drive unit DRV having an engine and a motor, and a power battery BATT that supplies electric power to the motor.

  The power feeding device 20 includes a high-frequency power source 21, a power feeding unit 22, a matching unit 27, and a control unit 28.

  The high frequency power source 21 generates, for example, high frequency power from a commercial power source and supplies it to a power supply unit 22 described later. The high frequency power generated by the high frequency power source 21 is set to a frequency equal to the resonance frequency of the power supply unit 22 and the resonance frequency of the power receiving unit 32 described later.

  The power supply unit 22 includes a power supply side coil 23, a power supply side capacitor body 24, and a power supply side case 25 that accommodates these. The power supply unit 22 is installed on the ground G as shown in FIG. The power supply unit 22 may be embedded in the ground G.

  The power supply side coil 23 is configured by winding a litz wire around a ferrite core (not shown) in a coil shape. The power supply side capacitor body 24 has a plurality of capacitors (not shown) mounted on a circuit board (not shown) connected in series or parallel to each other or connected in series and parallel. The power feeding side coil 23 and the power feeding side capacitor body 24 are connected in series with each other to form a resonance circuit that resonates at a predetermined resonance frequency. In the present embodiment, the power supply side coil 23 and the power supply side capacitor body 24 are connected in series, but may be connected in parallel.

  The matching unit 27 is a circuit for matching the impedance between the high-frequency power source 21 and the resonance circuit including the power supply side coil 23 and the power supply side capacitor body 24.

  The control unit 28 includes a well-known microcomputer having a ROM, a RAM, and a CPU, and controls the entire power supply apparatus 20. For example, the control unit 28 performs on / off control of the high-frequency power source 21 in response to a request for power transmission.

  The power receiving device 30 includes a power receiving unit 32 and a rectifier 38.

  The power receiving unit 32 includes a power receiving side coil 33, a power receiving side capacitor body 34, a power receiving side case 35 as a “housing” that accommodates these, a pair of covers 4 positioned on both sides of the power receiving side case 35, have.

  The power receiving side coil 33 is configured by winding a litz wire in a coil shape around a ferrite core (not shown). The power receiving side capacitor body 34 includes a plurality of capacitors (not shown) that are mounted on a circuit board (not shown) connected in series or parallel to each other, or connected in series and parallel. The power receiving side coil 33 and the power receiving side capacitor body 34 are connected in series with each other to form a resonance circuit that resonates at the same resonance frequency as the power supply unit 22. In the present embodiment, the power receiving side coil 33 and the power receiving side capacitor body 34 are connected in series, but may be connected in parallel.

  As shown in FIG. 3, the power receiving side case 35 is formed so as to be divided into a main body portion 36 provided with an opening and a lid portion 37 covering the opening of the main body portion 36. The main body 36 is made of a material that can pass magnetism from the power feeding device 20 such as fiber reinforced plastic (FRP). The lid portion 37 is made of, for example, a material that does not transmit magnetism (becomes a magnetic shield) such as aluminum or an aluminum alloy. Alternatively, the lid portion 37 may be made of a resin such as FRP like the main body portion 36, and a magnetic shield plate made of copper or aluminum may be disposed above the lid portion 37. The power receiving side case 35 is formed by combining the main body portion 36 and the lid portion 37 with a fixing means such as a screw (not shown) to form a space for accommodating the power receiving side coil 33 and the power receiving side capacitor body 34 inside.

  In addition, on both side surfaces 36 b and 36 c of the main body portion 36, fixing portions 39 that are bolted to the lower surface of the vehicle V are provided. As shown in FIG. 3, the power receiving side case 35 is bolted to the lower surface of the vehicle V so that the lid portion 37 is on the lower surface side of the vehicle V and the main body portion 36 is on the ground G side. Reference numeral 5 in FIG. 3 is a bolt passed through the bolt hole of the fixing portion 39. Reference numeral 6 in FIG. 3 is a nut screwed to the bolt 5. In FIG. 3, the power receiving side coil 33 and the power receiving side capacitor body 34 are not shown.

  The cover 4 is for preventing foreign matter from being caught in the vicinity of the fixing portion 39 and the bolt 5, and is formed so as to cover the fixing portion 39 and the bolt 5. In the present embodiment, since the fixing portions 39 are provided on both side surfaces 36b, 36c of the main body portion 36, a pair of covers 4 are also provided. The lower surface 4a of the cover 4 is continuous with the lower surface 36a of the main body 36 so that no foreign matter is caught on the boundary between the cover 4 and the power receiving side case 35. 3 is a side surface not shown in FIG. 3) and is continuous with the side surface of the main body 36 (the side surface not shown in FIG. 3). Further, the cover 4 is formed with as few asperities as much as possible in order to prevent foreign matters from being caught on the outer surface thereof.

  Further, the cover 4 prevents the magnetic field formed by the power feeding system 1 from being affected, and prevents the cover 4 itself from being affected by the magnetic field (the cover 4 is heated by the magnetic field). In order to prevent this, it is made of an insulating synthetic resin. Moreover, the cover 4 should just be nonmetallic, for example, may be comprised with rubber | gum or sponge. Such a cover 4 is attached to the lower surface of the vehicle V by fixing means (not shown). The cover 4 may be attached to the power receiving side case 35 or may be attached to both the vehicle V and the power receiving side case 35.

  The rectifier 38 converts the high frequency power received by the power receiving unit 32 into DC power. For example, a load L such as a charging unit used for charging a power battery BATT mounted on the vehicle V is connected to the rectifier 38.

  In the power supply system 1 described above, when a charging operation for the power battery BATT of the parked vehicle V is input at the power supply facility and a request for power transmission to the vehicle V is generated, the control unit 28 turns on the high-frequency power source 21. To generate high-frequency power. When the high frequency power is supplied to the power supply unit 22, the power supply unit 22 and the power receiving unit 32 magnetically resonate, and the high frequency power is transmitted from the power supply unit 22, and the high frequency power is received by the power receiving unit 32. The The high frequency power received by the power receiving unit 32 is converted into DC power by the rectifier 38 and supplied to the charging unit of the vehicle V, and the power battery BATT is charged by the charging unit.

  Further, in the power supply system 1 described above, since the fixing portion 39 and the bolt 5 that are likely to catch foreign matter are covered with the cover 4, foreign matter can be prevented from being caught in the vicinity of the fixing portion 39 and the bolt 5. Note that, as described in the section of the subject matter of the present application, when power feeding is started while a metal foreign object such as an empty can or a metal foil is caught in the vicinity of the fixing portion 39 and the bolt 5, the metal foreign object generates heat. May affect the operation and performance of the power feeding system 1, but such a situation does not occur in the power feeding system 1 in which the fixing portion 39 and the bolt 5 are covered with the cover 4, and power feeding can be performed safely and stably. It can be carried out.

(Second Embodiment)
A power receiving unit and a power feeding system according to a second embodiment of the present invention will be described with reference to FIG. In FIG. 4, the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 4, the power supply system of this embodiment is the same as that of the first embodiment except that the power receiving unit 132 includes a cover 104 instead of the pair of covers 4 described in the first embodiment. It is the same structure as the electric power feeding system demonstrated by 1.

  The cover 104 is provided so as to shield the entire power receiving side case 35 from the lower surface of the vehicle V. The cover 104 is made of an insulating synthetic resin similarly to the cover 4 of the first embodiment, and is formed with as few asperities as much as possible in order to prevent foreign matters from being caught on the outer surface thereof. Such a cover 104 is attached to the lower surface of the vehicle V by fixing means (not shown).

  In the power supply system of the present embodiment, the cover 104 that shields the entire power receiving side case 35 from the lower surface of the vehicle V not only near the fixing portion 39 and the bolt 5 but also in any part of the power receiving side case 35. In addition, no foreign matter is caught, and power can be supplied safely and stably.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

1 Power supply system 4,104 Cover 20 Power supply device (power supply unit)
22 Power supply unit 30 Power receiving device (power receiving unit)
32,132 Power receiving unit 35 Power receiving side case (housing)
39 Fixed part G Ground V Vehicle

Claims (4)

A power receiving unit that is provided on the lower surface of the vehicle and receives power transmitted from a power feeding unit provided on the ground in a non-contact manner,
The housing of the power receiving unit is provided with a fixing portion that is bolted to the vehicle,
A power receiving unit comprising: a cover made of a non-metal that covers at least the fixing portion and is attached to the housing or the vehicle. The cover is positioned on a side of the housing;
The power receiving unit according to claim 1, wherein a lower surface of the cover is continuous with a lower surface of the housing. The power receiving unit according to claim 1, wherein the cover is provided so as to shield the entire housing from the lower surface of the vehicle. A power supply system having a power supply unit provided on the ground and a power reception unit provided on a vehicle, wherein the power reception unit receives power transmitted from the power supply unit in a contactless manner;
The power receiving unit includes the power receiving unit according to claim 1.

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