KR20180064218A - Contactlesspower supplying device for small electric vehicle - Google Patents

Abstract

A contactless power transmission device for a compact electric vehicle includes: a feed plate embedded in the ground to generate a magnetic field for charging; And a current collecting plate which is arranged at a predetermined distance from the power feeding plate and which is charged wirelessly by converging a magnetic field generated by the power feeding plate. The power feeding plate and the current collecting plate are formed by winding the coil in a spiral shape, And a plurality of conductors arranged in a shape to surround a predetermined interval between at least one surface of the coil portion and the coil portion formed in the disk shape. The contactless power transmission device for a small-sized electric vehicle can be efficiently fed and collected, and can be applied without changing the structure of a conventional vehicle. The small-sized noncontact electric power transmission device can generate a large amount of eddy currents.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a contactless power transmission device for a small-

 More particularly, the present invention relates to a contactless power transmission device for a compact electric automobile, which reduces the deviation of right and left of a power supply device and a current collector device when charging an electric vehicle, Transmitting apparatus.

With the development of online electric vehicles that can be charged in a noncontact manner, various types of customized technologies are required. As one application example, in this specification, in the case of a miniature electric vehicle in which a small orbit or a limited space is repeatedly operated, an optimized customized technology development will be discussed.

In other words, a structure and a control method are required for small-sized eco-friendly vehicles, mini-trams, and small shuttle buses operated in exhibitions, parks, arboretums, and sightseeing facilities.

In such a compact electric vehicle, the high frequency induction magnetic field generated from the high frequency alternating current supplied from the feed inverter through the feed line is converted into a voltage by the current collecting module mounted on the lower portion of the vehicle, and then the voltage is increased through the current collecting regulator to charge the battery. That is, the feed inverter conducts high frequency current to the feed line, induction magnetic field in the feed line is generated by the high frequency current passing through the power cable, induction magnetic path is formed through the ferrite core, The magnetic field is then converted back to electricity. In this way, the feeder inverter is also referred to as a contactless power supply (CPS) because it serves to transmit electric power by magnetic coupling without electrical and mechanical contact.

In a compact electric vehicle, the ground clearance, which is the distance between the road surface and the current collecting module installed in the lower part of the vehicle, is set to be 12 cm or more by automobile safety standards. Under these regulations, maximum efficiency is 60% And EMF (Electro-Magnetic Field), which is a magnetic field dimension around the vehicle, is preferably 62.6 mG (Million Gauss) or less (ICNIRP: International Commission on Non-Ionizing Radiation Protection) recommendation). Particularly, in a radar system for a compact electric vehicle, the power supply device is divided into a plurality of segments, each segment is on / off controlled according to the progress of the vehicle, and it is required to satisfy the EMI (Electro Magnetic Interference) standard. In addition, intensive power transmission must be performed when the vehicle is stopped, such as when stopping or parking, which is not yet efficient. Further, there is a problem that the related apparatus becomes large in order to achieve the desired charging for a short time. In addition, when a vehicle enters for charging, a voltage induced when a right / left deviation occurs may be lowered, so that a precise entry of the vehicle is required.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a contactless power transmission apparatus for a compact electric vehicle suitable for a compact electric vehicle, .

Further, the present invention is to provide a contactless power transmission apparatus for a small electric automobile which can be applied without changing the structure of a conventional small electric vehicle.

Further, the present invention is to provide a contactless power transmission device that is small in size and can generate a large magnetic eddy current to reduce lateral deviation.

A contactless power transmission device for a small electric automobile according to the present invention will be described. A contactless power transmission device for a compact electric vehicle, which is a non-contact power transmission device for wirelessly transmitting electromagnetic energy to a small electric vehicle parked or stopped, comprising: a power feeding plate embedded in the ground to generate a magnetic field for charging; And a collecting plate disposed at a predetermined interval and disposed in the small electric vehicle and charged with radio waves by converging a magnetic field generated in the power feeding plate, wherein the power feeding plate and the current collecting plate are formed by winding a coil in a spiral shape, And a plurality of conductors arranged in a shape to surround a predetermined interval between at least one surface of the coil portion and a coil portion formed in a disc shape having an empty central portion.

According to one aspect, the plurality of conductors may have a shape in which the cross section of the "concave" shape extends in a predetermined direction in one direction.

According to one aspect, the plurality of conductors may be disposed radially on the coil section.

According to one aspect, the plurality of conductors may be ferrite.

According to one aspect, the width of the plurality of conductors disposed on the current collecting plate may be 2.5 times the width of the plurality of conductors disposed on the feed plate.

According to one aspect, the number of the plurality of conductors disposed on the current collecting plate may be half the number of the plurality of conductors disposed on the feed plate.

According to one aspect, the feed plate may have an outer diameter larger than an outer diameter of the current collecting plate.

According to the embodiments of the present invention, it is possible to efficiently supply and collect electricity during stopping or parking.

In addition, it can be applied without changing the structure of a conventional compact electric vehicle.

In addition, it is possible to reduce the lateral deviation by generating the magnetic field eddy current to a large extent.

1 is a configuration diagram showing a charging system of a small electric vehicle according to an embodiment.
2 is a perspective view schematically illustrating a noncontact power transmission apparatus according to an embodiment.
3 is a cross-sectional view schematically showing a cross section of the noncontact power transmission apparatus according to the embodiment.
FIG. 4 is a graph showing a simulation of a magnetic field flux after concentric arrangements of the feed plate and the current collector plate according to the embodiment. FIG.
FIG. 5 is a graph simulating a magnetic field shape when a right-left deviation occurs in the feed plate and the current collecting plate according to the embodiment. FIG.

Hereinafter, embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments, detailed description of known functions and configurations incorporated herein will be omitted when it may make the best of an understanding clear.

In describing the components of the embodiment, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a configuration diagram showing a charging system for a small-sized electric vehicle according to an embodiment. FIG.

1, a power supply system 1 of a miniature electric vehicle 20 may include a power supply device 10, a power supply inverter 30 and a control device 40. [

The power feeding device 10 may include a magnetic core 11 and a high frequency cable 12. [

The magnetic core 11 can create a magnetic field path for the magnetic field induced by the high-frequency current. In addition, the magnetic core 11 plays a role in allowing the magnetic field to reach the current collector 21 provided in the online automobile with high efficiency. The magnetic core 11 may be embedded in the ground. Further, the magnetic core 11 can convert a high-frequency current into an electromagnetic field (EMF).

The high-frequency cable 12 can conduct a high-frequency current. One side of the high frequency cable (12) is connected to the magnetic core (11) so that a high frequency current can be conducted to the magnetic core (11). And the other side of the high-frequency cable 12 can be connected to the feed inverter 30. [

The feeder 10 may be embedded in the ground and electrically connected to the feeder inverter 30. [ Further, the power feeding device 10 can supply the electric power supplied from the power feeding inverter 30 to the small electric vehicle being parked or stopped.

The feed inverter 30 can generate a high frequency current which is a three-phase AC power source through the high-efficiency resonance control. Here, the three-phase alternating current power source is an alternating current power source having a phase difference of 120 ° from each other with the same frequency and amplitude of voltage and current generated by the three-phase alternating current generator, Is small and the Joule heat consumed by the line is small, and the electric motor using the three-phase alternating current is superior to the single phase in the case of the electric motor, which is widely used.

In addition, a plurality of switches (not shown) may be connected in series in the feed inverter 30 to form a leg. The power supply inverter 30 can supply current to the power supply device 10, which is formed on the basis of common contacts between switches of different legs, by connecting a plurality of legs in parallel.

In addition, since a small number of the power feed inverters 30 are required in the small electric vehicle 20, it is preferable that a plurality of the power feeders 10 can be connected to one power feed inverter 30. [ It is preferable to include a switch for supplying electric power to the plurality of feeders 10 by one feeder inverter 30. [

The control device (40) can turn on or off the switch to the voltage value output from the feed inverter (30).

The compact electric vehicle (20) may include a current collector (21).

The current collecting device 21 can be mounted under the miniature electric vehicle 20. Further, the current collector 21 converts the non-contact induced magnetic field to a voltage, and can drive the miniature electric vehicle 20 using the converted low voltage.

The high frequency power supplied from the feed inverter 30 can be supplied to the magnetic core 11 through the high frequency cable 12. [ The magnetic core 11 can provide a magnetic field path for the magnetic field induced by the supplied high frequency power. When the magnetic field induced in the magnetic core 11 reaches the current collector 21, the magnetic field induced in the current collector 21 can be rectified and used as a power source for the small electric vehicle 20.

A small electric vehicle 20 using such a power supply system 1 can be an eco-friendly vehicle, a mini-tram, a small shuttle bus, a Personal Rapid Transit (PRT), a taxi and a small van, have.

That is, it is suitable for small-sized eco-friendly vehicles, mini trams, and small shuttle buses operated in exhibitions, parks, arboretums, and sightseeing facilities because they are compact and can be charged with optimum efficiency during parking or stopping.

2 to 3, the present invention will be described in more detail. 2 is a perspective view schematically showing a noncontact power transmission apparatus for a miniature electric vehicle according to an embodiment. 3 is a cross-sectional view schematically showing a cross-section of a contactless power transmission apparatus for a small-sized electric vehicle according to an embodiment. In order to facilitate understanding of the present embodiment, the coil portion and the conductor included in the feed plate and the current collecting plate are separately described as a first coil portion and a second coil portion, and a first conductor and a second conductor, respectively.

2 to 3, the contactless power transmission device 2 for a miniature electric vehicle includes a power feeding plate 110 located in the power feeding device 10 and a current collecting plate 210 located in the power collecting device 20 .

The feed plate 110 may include a first coil part 111 and a first conductor 113.

The first coil part 111 may be configured so that the coil is wound in a concentric circle in a spiral shape and converged into a whirl-like shape internally. The first coil section 111 may be formed in a disc shape whose entire shape is hollow at the center. A first conductor 113 may be provided on one surface of the first coil section 111.

The first conductor 113 may have a shape in which a section of a "concave" shape is formed by extending a predetermined distance in one direction. Accordingly, the first conductor 113 can be arranged in such a shape that the bottom surface of the first coil part 111 is coupled to the inner surface of the "concave" shape so as to surround the bottom surface of the coil part 111. The first conductor 113 may be disposed at a predetermined distance in the radial direction on the bottom surface of the first coil section 111, and a plurality of the first conductors 113 may be disposed. The first conductor 113 may be ferrite.

For example, the first conductor 113 preferably has a width of 2 cm. In addition, it is preferable that twenty-four first conductors 113 are arranged on the first coil portion 111 at regular intervals. The power supply plate 110 thus formed can convert a high-frequency current into a magnetic field to generate a magnetic field for charging.

The current collector plate 210 may include a second coil portion 211 and a second conductor 213.

Like the first coil part 111, the second coil part 211 can be constituted such that the coil is wound in a spiral shape and is converged in a whirling manner to the inside. The second coil portion 211 may be in the form of a disk whose entire shape is hollow at the center. The second coil portion 211 may have a smaller outer diameter than the first coil portion 111.

The second conductor 213 may have a shape in which a section of a "concave" shape is formed by extending a predetermined distance in one direction. The second conductor 213 may be disposed such that the upper surface of the second coil portion 211 is surrounded by a "concave" inner surface. A plurality of second conductors 213 may be disposed radially on the upper surface of the second coil portion 211 at regular intervals. The second conductor 213 may be ferrite.

It is preferable that the width of the second conductor 211 disposed on the current collecting plate 210 is 2.5 times the width of the first conductor 111 disposed on the feed plate 110. For example, it may be preferred that the width of the first conductor 111 is 2 cm, so that the second conductor 211 preferably has a width of 4.5 cm.

It is preferable that the number of the second conductors 211 disposed on the current collecting plate 210 is half the number of the second conductors 213 disposed on the feed plate 110. For example, since the number of the first conductors 113 is twenty-four, it is preferable that twelve second conductors 213 are arranged on the second coil portion 211 at regular intervals.

The current collecting plate 210 may be an optimal structure for converging the magnetic field generated by the power feeding plate 110 to be charged wirelessly.

The outer diameter of the feed plate 110 may be larger than the outer diameter of the current collector plate 210. The conductors 113 of the power feeding plate 110 may be disposed on the current collecting plate 210 in such a manner that they do not face the conductors 213 but face each other. Also, the power feed plate 110 and the current collecting plate 210 may be disposed at predetermined intervals.

The noncontact power transmission device 2 for a compact electric automobile can have an increased efficiency and an excellent output.

FIG. 4 is a graph showing a simulation of a magnetic field flux after concentric arrangements of the feed plate and the current collector plate according to the embodiment. FIG. 4 (a) is a perspective view showing a simulation of a magnetic field flux generated in a non-contact power transmission device, and FIG. 4 (b) is a graph showing a simulation result of a magnetic field flux generated on a bottom surface of a feed plate generated in a non- Fig.

Referring to FIG. 4, in the contactless power transmission device 2 for a small electric automobile, 24 conductors 113, which are ferrite in the form of a "concave" shape with a width of 2 cm, are attached to the first coil section 111 12 conductors 213, which are ferrite in the form of a "concave" shape having a width of 4.5 cm, may be disposed on the second coil portion 211 at regular intervals. Further, in the non-contact power transmission device 3, the outer diameter of the feed plate 110 may be larger than the outer diameter of the current collecting plate 210.

The magnetic field flux formed in such a non-contact power transmission device 2 for small electric vehicles is indicated in blue.

The magnetic field flux is not formed in the portion of the conductors 113 and 213. Therefore, if the conductors 113 and 213 are too many, the efficiency may be lowered.

It can also be seen that the magnetic field flux formed in the feeder 110 and the current collector 210 of the non-contact power transmission device 2 for small electric vehicles is formed in a uniform tube shape. The magnetic field flux formed in the noncontact power transmission apparatus 2 is a structure in which the inductance value of the first coil section 111 of the feed plate 110 is improved by the conductor 113 composed of ferrite and the efficiency can be maintained I can show you.

FIG. 5 is a graph simulating a magnetic field shape when a right-left deviation occurs in the feed plate and the current collecting plate according to the embodiment. FIG.

Referring to FIG. 5, after a deviation of 20 cm between the feed plate 110 and the current collecting plate 210 is generated, the magnetic field is expressed in a vector form. According to the experiment, the non-contact power transmission device 2 for a compact electric automobile according to the present embodiment generates a large magnetic field eddy shape, thereby reducing a reduction in output with respect to lateral deviations. Therefore, it is possible to confirm the feeding and charging efficiency due to efficient diffusion of the magnetic field.

Hereinafter, the noncontact power transmission device for a small-size electric car and the non-electric power transmission device for a small-sized electric vehicle according to the embodiment, in which the rectangular plate-shaped ferrite is disposed as a conductor in a coil part, will be described.

The table below shows the relationship between the output of the noncontact power transmission device for a small electric car and the contactless power transmission device for a small electric vehicle according to the embodiment, the output reduction ratio according to the lateral deviation, .

Comparative Example: Fabrication of a contactless power transmission device having the same feed plate and collector plate

The coil was wound in a spiral shape to form a coil portion in the form of a disk with an empty central portion and 12 pieces of ferrite in a rectangular shape having a predetermined width in the form of a rectangular plate were arranged radially to prepare a feed plate. The collector plate was manufactured in the same manner as the feed plate. A power feeding plate and a current collecting plate were arranged at a predetermined interval to fabricate a contactless power transmission device for a small sized electric vehicle.

Example: Manufacture of contactless power transmission device (2) for small electric vehicle according to the embodiment of the present invention

The feed plate 110 is formed by winding a coil in a spiral shape so as to form a first coil section 111 in the shape of a disk having an empty central portion and a cross section of a "concave" shape in the first coil section 111 in one direction And 24 conductors 113 composed of ferrite having a width of 2 cm and extended at predetermined intervals were radially arranged in the first coil part 111. [ The current collecting plate 210 is formed by winding a coil in a spiral shape to form a second coil portion 211 having an outer diameter smaller than that of the first coil portion 111 in the shape of a disk having an empty central portion, 211 were formed by radially arranging twelve conductors 213 made of ferrite having a "concave" shape in one direction at a predetermined interval and having a width of 4.5 cm. The power feeding plate 110 and the current collecting plate 210 are formed to be spaced apart from each other by a predetermined distance to manufacture the noncontact power transmission device 2 for a small sized electric vehicle.

Test Example: Evaluation of Electrical Characteristics of Contactless Power Transmission Device for Small Electric Vehicle

The output of the comparative example and the embodiment, the reduction of the output according to the lateral deviation, and the induced voltage were measured.

division Comparative Example Example Print 15kW 27kW When a right-left deviation (20 cm) occurs,
Reduced output Approximately 60% reduction Approximately 45% reduction Induced voltage 600V 1.1 kV

Referring to Table 1, the output of the contactless power transmission device 3 for a compact electric vehicle according to the embodiment is about 1.8 times higher than that of the contactless power transmission device according to the comparative example. Further, the noncontact power transmission device 2 for a small electric automobile according to the embodiment measures 20 cm lateral deviation, and as a result, the output reduction amount is 45%. As a result, the output reduction amount of the contactless power transmission device for a small- , Which is about 60%, can be reduced by about 15%. Further, it was confirmed that the contactless power transmission device 2 for a compact electric vehicle according to the embodiment exhibits an induced voltage as high as 1.8 times as compared with the contactless power transmission device for a compact electric vehicle according to the comparative example. Thus, it can be confirmed that the noncontact power transmission device 2 for a compact electric automobile according to the embodiment has excellent electrical characteristics.

As described above, the noncontact power transmission apparatus for a compact electric vehicle according to the embodiment can be efficiently fed and collected during stopping or parking.

It can also be applied without changing the structure of existing vehicles.

In addition, it is possible to reduce the lateral deviation by generating the magnetic field eddy current to a large extent.

Although the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And various modifications and changes may be made thereto without departing from the scope of the present invention. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

1: Feeding system
10: Feeding device
11: Magnetic core
12: High frequency cable
20: Small electric cars
21: Current collector
30: Feeding inverter
40: Control device
2: Contactless power transmission device for small electric vehicles
110: Feed plate
111: first coil part
113: first conductor
210: House front plate
211: second coil part
212: second conductor

Claims (7)

A contactless power transmission device for wirelessly transmitting electromagnetic energy to a compact electric vehicle parked or stopped, comprising:
A feed plate embedded in the ground to generate a magnetic field for charging; And
A current collecting plate disposed at a predetermined distance from the power feeding plate and disposed in the small electric vehicle, the power collecting plate being charged with radio waves by converging a magnetic field generated at the power feeding plate;
/ RTI >
Wherein the feed plate and the current collector plate are made of a metal,
A coil portion wound in a helical shape and formed in a disc shape having an empty central portion; And
A plurality of conductors arranged in a shape to surround a predetermined interval of at least one surface of the coil section;
Contact electric power transmission device for a compact electric automobile. The method according to claim 1,
Wherein the plurality of conductors comprise:
Contact electric power transmission device for a compact electric automobile in which the cross-section of the "concave" shape extends in a predetermined direction in one direction The method according to claim 1,
Wherein the plurality of conductors comprise:
And a noncontact power transmission device for a miniature electric vehicle arranged radially on the coil part. The method according to claim 1,
Wherein the plurality of conductors comprise:
Contactless power transmission device for a small electric car, which is a ferrite. The method according to claim 1,
Wherein the width of the plurality of conductors disposed on the current collecting plate is 2.5 times the width of the plurality of conductors disposed on the feed plate, The method according to claim 1,
Wherein the number of the plurality of conductors arranged on the current collecting plate is half the number of the plurality of conductors arranged on the feed plate, The method according to claim 1,
The feed plate
Contact electric power transmission device for a compact electric automobile in which an outer diameter is formed larger than an outer diameter of the current collecting plate.

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