JP2011167009A - Noncontact power supply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noncontact power supply sufficiently supplying a power even when a distance between a power supply and a power receiving unit is increased. <P>SOLUTION: The noncontact power supply 10 includes: a high-frequency power supply 17; and a primary coil 15 connected to the high-frequency power supply 17 and supplies a secondary coil 23 oppositely arranged to the primary coil 15 with a power. In the noncontact power supply, a primary-side resonance coil 16 magnetically coupled with the primary coil 15 and connected to a first capacitor 18 for resonance is mounted near or unified with the primary coil 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a non-contact power feeding device that supplies power in a non-contact manner to a load such as an electric vehicle or a transport vehicle equipped with a secondary coil for receiving power.

For example, a battery-powered electric vehicle needs to be charged regularly, and the vehicle is stopped near a charger placed in place and the vehicle's battery and charger are connected using a connection cord. However, the battery was charged. However, when charging a battery using a connection cord, it is extremely troublesome to connect the connection cord to a power supply source. For example, as shown in Patent Documents 1 to 3, power is supplied to the vehicle without contact. To be done. In Patent Documents 1 to 3, a primary coil connected to a high-frequency power source and a secondary coil connected to a load are provided, and L (reactor) and C (capacity) are provided on the primary coil side or the secondary coil side. A resonant circuit is provided.

Japanese Patent Laid-Open No. 2005-94862 JP 2006-325350 A WO2006 / 022365 JP-A-63-73837 Japanese Patent No. 4318742

However, as described in Patent Documents 1 to 3, when a resonance circuit is incorporated on the primary coil side or the secondary coil side, there is a problem that it is difficult to obtain a large load current. Although the reason for this is not clear, it is estimated that the cue (Q) of the circuit is lowered because a load is connected to the circuit.

In FIG. 7 of Patent Document 4, a power supply device is proposed in which a saturable iron core is used and a resonance coil having a capacitor for resonance (capacitor) as a load is provided in addition to a secondary coil that connects a load. It is described that the capacitor circuit and the secondary coil are electrically insulated. However, even with this configuration, when the gap between the primary coil and the secondary coil becomes large, there is a problem that the power reception efficiency is extremely lowered and cannot be put into practical use.

On the other hand, Patent Document 5 proposes a non-contact power feeding device having a resonance circuit in which a capacitor is connected to a tertiary coil provided close to the secondary coil, but a resonance circuit is provided on the primary coil side. Therefore, when the distance between the primary coil and the secondary coil is increased, there is a problem that a large current is not generated in the secondary coil.

This invention is made | formed in view of this situation, and it aims at providing the non-contact electric power feeder which can supply electric power even if the distance of a primary coil and a secondary coil is further separated.

A non-contact power feeding apparatus according to the present invention that meets the above-described object has a high-frequency power source and a primary coil connected to the high-frequency power source, and supplies power to a secondary coil arranged to face the primary coil. In the apparatus, the primary side resonance coil that is magnetically coupled to the primary coil and connected to the first capacitor for resonance is wound separately from the primary coil and integrated or separated so as to be close to or close to the primary coil. Provided.

Here, the high-frequency power source refers to a power source that generates a high frequency of 20 kHz to 100 kHz, for example. Usually, a commercial power source is rectified to obtain a direct-current power source, and further converted into alternating current of a predetermined frequency using an inverter. In addition, a solar cell can be used instead of the commercial power source.

In the non-contact power feeding device according to the present invention, a resonance second capacitor connected in parallel to the secondary coil may be provided. In addition, this 2nd capacitor | condenser is not an essential structure in the non-contact electric power feeder which concerns on this invention.

In the non-contact power feeding device according to the present invention, the primary coil and the primary side resonance coil may be wound independently, and the primary coil and the primary side resonance coil may be coreless. In this case, the primary coil, the primary side resonance coil, and the secondary coil may be a cylindrical coil or a coil wound in a plane spiral shape (see Patent Document 5), which is a combination of these. May be.

In the non-contact power feeding device according to the present invention, the non-contact power feeding device may be disposed (stationary or buried) at a predetermined position in a parking lot space where a car stop is installed. And this non-contact electric power feeder may be integral with the said vehicle stop. Moreover, it is preferable that a magnetic shield material is provided on the back side of the primary coil (and the secondary coil). In this case, the magnetic shield material is preferably a material that efficiently shields a high-frequency magnetic field, such as a ferrite plate.

And the non-contact electric power feeder which concerns on this invention WHEREIN: The said primary side resonance coil is good to be arrange | positioned between the said primary coil and the said secondary coil. Thereby, the magnetic field generated by the primary coil can be efficiently guided to the secondary coil.

In the non-contact power feeding device of the present invention, since the primary side resonance coil that is magnetically coupled to the primary coil and connected to the first capacitor for resonance is provided, the amount of magnetic flux generated from the primary side is remarkably increased. Power can be sent to a secondary coil located at a distance.

In particular, when the non-contact power feeding device of the present invention is installed at a predetermined position in a parking space where a car stop is installed, the battery of a vehicle parked in the parking space can be charged from the outside cordlessly. .

Furthermore, when this non-contact power feeding device is integrated with a vehicle stop for determining the stop position of a car (vehicle, automobile), positioning of the vehicle side secondary coil to face the primary coil can be performed accurately and easily. . Moreover, since the non-contact power feeding device is integrated with the vehicle stop, the installation work is facilitated.

It is a schematic explanatory drawing of the non-contact electric power feeder which concerns on the 1st Embodiment of this invention. It is explanatory drawing of the non-contact electric power feeder. (A) and (B) are the side view and top view at the time of attaching the non-contact electric power feeder to a parking space. It is a schematic explanatory drawing of the non-contact electric power feeder which concerns on the 2nd Embodiment of this invention.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1-3, the non-contact electric power feeder 10 which concerns on the 1st Embodiment of this invention is united with the vehicle stop 11a for determining the stop position of a vehicle, for example on the road surface 11 of a parking space. Thus, electric power is supplied in a non-contact manner to a power receiving unit 14 provided in a parked vehicle (for example, an automobile or a freight car) 13. These will be described in detail below. In addition, 11b shows a wall and 11c shows a mirror for confirmation.

As shown in FIG. 1 to FIG. 3A and FIG. 3B, the non-contact power feeding device 10 is a primary coil 15 spirally wound in a plane (wound in a spiral plane) with an air core (coreless), A primary side resonance coil 16 that is magnetically coupled to the primary coil 15 and spirally wound in a plane with an air core is provided in a separated state (independent winding, that is, provided in the vicinity). Is connected to a high-frequency power source 17.

A resonance first capacitor 18 is connected to the primary side resonance coil 16. The high-frequency power source 17 has a rectifier circuit for an AC power source and an inverter circuit that converts a direct current from the rectifier circuit into a high-frequency alternating current of 20 kHz to 100 kHz (20 kHz to 30 kHz in this embodiment). The primary coil 15 and the primary side resonance coil 16 are placed on a support member made of a rectangular insulating plate 16a and wound, and the whole is sealed with resin to form rectangular plates 20 and 21. The primary coil 15, the primary side resonance coil 16, and the capacitor 18 constitute a power feeding unit that supplies power to the power receiving unit 14.

In this embodiment, a ferrite plate 19, which is an example of a magnetic shield material, is provided on the back side of the primary coil 15, that is, the side not facing the power receiving unit 14. The ferrite plate 19 prevents the magnetic flux generated by the primary coil 15 from flowing to the back side and heating the metal to cause loss (eddy current loss).

The rectangular plates 20 and 21 and the ferrite plate 19 that house the primary coil 15 and the primary-side resonance coil 16 change the overall inductance and the resonance frequency when the distance between them changes easily. (In this embodiment, 4) bolts 23a, nuts 24a screwed to these, and collars (positioning pipes) 25a inserted through the bolts 23a are accurately positioned.

In this embodiment, the gap b between the primary coil 15 and the primary side resonance coil 16 is 5 to 15 mm, and the gap a between the primary coil 15 and the ferrite plate 19 is 5 to 20 mm. The thickness of the ferrite plate 19 is determined so as not to be saturated by the generated magnetic field (that is, within 90% of the saturation magnetic flux).

The capacitor 18 is connected in parallel to the primary side resonance coil 16 by connecting a plurality of small-capacitance capacitors in parallel. Note that if the transmission frequency of the high frequency power supply 17 and the resonance frequency of the primary side resonance circuit constituted by the capacitor 18 and the primary side resonance coil 16 are exactly matched, a large amount of current flows in the primary side resonance coil 16 and the capacitor 18. Therefore, the transmission frequency of the high frequency power supply 17 and the resonance frequency of the primary side resonance circuit are preferably different by less than 5%. Note that the resonance frequency of the primary side resonance circuit can also be changed by changing the gap b between the primary coil 15 and the primary side resonance coil 16 or the gap a between the primary coil 15 and the ferrite plate 19.

The power receiving unit 14 is disposed 10 to 50 cm (distance L) away from the non-contact power feeding device 10 and is fixed to the bottom of the vehicle 13. The power receiving unit 14 is disposed at a position facing the primary coil 15 (that is, a position immediately above) when the vehicle tire 13a is applied to the vehicle stop 11a and stopped. The power receiving unit 14 includes a secondary coil 23 that is disposed opposite to the primary coil 15 and magnetically coupled to the primary coil 15, and a resonance second connected in parallel to the charging unit 24 that is a load of the secondary coil 23. The capacitor 25 is provided. The secondary coil 23 has the same structure as the primary coil 15, is wound along a rectangular insulating plate, becomes a rectangular plate 26, and a ferrite plate 27, which is an example of a magnetic shield material disposed on the back side, A plurality of (for example, four) bolts 28 and nuts 29 are fixed. In this embodiment, the gap d between the rectangular plate 26 and the ferrite plate 27 is 2 to 10 cm. The rectangular ferrite plate 27 has a larger area than the rectangular plate 26.

The capacitor 25 connected to the secondary coil 23 constitutes a secondary side resonance circuit with the secondary coil 23, and this secondary side resonance circuit is made to coincide with the transmission frequency of the high frequency power source 17 and more efficiently the secondary coil. A current is allowed to flow through 23. Note that the resonance current can be controlled by shifting the resonance frequency of the secondary side resonance circuit within a slight range (for example, a range of ± 1 kHz) from the transmission frequency of the high-frequency power supply 17. A battery 30 is connected to the charging unit 24 to supply power up to a predetermined voltage.

The operation of the non-contact power feeding apparatus 10 will be described. The vehicle 13 is stopped at a specific position in the parking space (that is, the position where the tire 13a hits the car stop), and the non-contact power feeding apparatus 10 (specifically, the primary coil 15) The power receiving unit 14 is opposed. When the high frequency power supply 17 is turned on, a high frequency current flows through the primary coil 15, and a resonance current flows through the primary side resonance coil 16. The magnitude of the resonance current can be changed by adjusting the resonance frequency of the primary side resonance circuit. A high frequency current is induced in the secondary coil 23 by the magnetic flux from the primary coil 15, and the battery 30 is automatically charged via the charging unit 24.

Next, the non-contact power feeding apparatus 33 according to the second embodiment of the present invention shown in FIG. 4 will be described.
The non-contact power feeding device 33 includes a power feeding unit 34 and a power receiving unit 35 arranged with a gap L. The power feeding unit 34 is wound with a primary coil 36 and a primary side resonance coil 37. And a core 38 having an E-shaped cross section. A high frequency power source 17 is connected to the primary coil 36, and a resonance capacitor 18 is connected to the primary side resonance circuit 37. In this embodiment, the core 38 is formed of a ferrite core, and has a bottomed cylindrical shape having a columnar magnetic pole portion 39 in the center when viewed from the front.

The power receiving unit 35 includes a secondary coil 41, an E-shaped core 42 around which the secondary coil 41 is wound, a charging unit 24 connected to the secondary coil 41, and a charging unit 24 connected to the battery 30. And a capacitor 25 connected in parallel.
In this embodiment, the core 42 is formed of a ferrite core, and has a bottomed cylindrical shape having a columnar magnetic pole portion 43 in the center when viewed from the front. Similar to the primary coil 36 and the primary side resonance coil 37, the secondary coil 41 has a cylindrical winding (strictly, a cylindrical multilayer winding), and the primary coil 36, the primary side resonance coil 37, and the secondary coil 41 have a circular cross section. Attached to the magnetic pole portions 39 and 43, respectively. Since the basic operation of the non-contact power supply apparatus 33 is the same as that of the non-contact power supply apparatus 10, the description of the operation is omitted.

The present invention is not limited to the embodiments, and the shape, dimensions, number of turns, and the like can be changed without departing from the scope of the present invention. In addition to the automobile, the present invention is also applied when power is supplied to a robot, a moving or fixed facility machine, or the like. Furthermore, the attachment positions of the power feeding unit and the power receiving unit are arbitrary in the vertical and horizontal directions, and the distance L between the power feeding unit and the power receiving unit can be changed as appropriate according to the situation on the spot.
Further, the primary coil and the primary side resonance coil can be integrally wound around one winding.

In the above invention, a ferrite plate is used as the magnetic shield plate. However, other materials can be used as long as the material has good high frequency characteristics and low iron loss.
Moreover, in the said embodiment, although the high frequency power supply 17 was supplied with electric power from the commercial power source using the outlet 45, for example, it receives electric power supply from the solar cell etc. which were provided on the parking space and the building. You can also.
Furthermore, in this embodiment, the non-contact power feeding device 10 is integrated and incorporated in the car stopper 11a, but the present invention is also applied to a case where the non-contact power feeding device is attached to a wall surface, a ceiling surface, or a pillar.

10: Non-contact power supply device, 11: Road surface, 11a: Car stop, 11b: Wall, 11c: Mirror, 13: Vehicle, 13a: Tire, 14: Power receiving unit, 15: Primary coil, 16: Primary resonance coil, 16a: Insulating plate, 17: high frequency power supply, 18: capacitor, 19: ferrite plate, 20, 21: rectangular plate, 23: secondary coil, 23a: bolt, 24: charging unit, 24a: nut, 25: capacitor, 25a: color , 26: rectangular plate, 27: ferrite plate, 28: bolt, 29: nut, 30: battery, 33: non-contact power feeding device, 34: power feeding unit, 35: power receiving unit, 36: primary coil, 37: primary side resonance Coil, 38: Core, 39: Magnetic pole, 41: Secondary coil, 42: Core, 43: Magnetic pole, 45: Outlet

Claims (6)

In a non-contact power feeding device that has a high frequency power source and a primary coil connected to the high frequency power source, and supplies power to a secondary coil disposed to face the primary coil,
A non-contact power feeding device, wherein a primary resonance coil magnetically coupled to the primary coil and connected to a resonance first capacitor is provided near or integrally with the primary coil. The contactless power supply device according to claim 1, wherein the contactless power supply device is disposed at a predetermined position in a parking lot space where a car stop is installed. 3. The non-contact power feeding device according to claim 2, wherein the non-contact power feeding device is integrated with the vehicle stopper. The contactless power supply device according to claim 1, wherein the high-frequency power supply is supplied with power from a commercial power supply. The non-contact electric power feeder of any one of Claims 1-3 WHEREIN: The said high frequency power supply is supplied with electric power from the solar cell, The non-contact electric power feeder characterized by the above-mentioned. The contactless power supply device according to any one of claims 1 to 5, wherein the primary coil and the primary side resonance coil are wound independently of each other.

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