KR20150032386A - Wireless Electric Power Supply Apparatus - Google Patents

Abstract

An embodiment of the present invention relates to a wireless electric power supply apparatus which supplies three phase alternating current voltage to reduce magnetic field and increase generated voltage of an induced electromotive force. An embodiment of the wireless electric power supply apparatus comprises a power supply part comprising a magnetic field forming part formed in shape of ″C″, including a pair of upper end surfaces, wherein the upper end surfaces receive electric power to form a magnetic field, an electric power supply part supplying electric power to the magnetic field forming part; and a current collecting part including an electric induction part having an induced electromotive force induced by the magnetic field generated in the power supply part and a current collecting core wounded with the electric induction part, and sending the induced electromotive force induced in the electric induction part from the electric induction part to charge.

Description

[0001] WIRELESS POWER SUPPLY APPARATUS [0002]

An embodiment of the present invention relates to a wireless power supply apparatus capable of reducing a generation range of a magnetic field by supplying a three-phase AC voltage and increasing a voltage of an induced electromotive force.

The contents described in this section merely provide background information on the embodiment of the present invention and do not constitute the prior art.

Generally, an electric vehicle refers to a vehicle that uses electricity as a power source for moving a vehicle. In order to operate an electric vehicle, an electric vehicle is charged with electric power charged by charging the battery mounted on the electric vehicle. In order to charge the electric power of such an electric vehicle, a person or a mechanical device supporting the charge directly connects the charging wire to the vehicle, thereby not only inconvenience the charging, but also, in the process of connecting the electric plug to the electric car, There is a dangerous problem. The method of charging the battery of the electric vehicle using the charging wire in this way causes a disadvantage of the user and there is a risk of electric shock, and research and development of a wireless power supply device capable of charging the battery of the electric vehicle by radio have recently been actively conducted .

Generally, a wireless power supply uses a method of supplying a power to form a magnetic field and utilizing an induced electromotive force generated by a change in a magnetic field. However, when the wireless power supply device operates, an EMF (Electro-Magnetic Field) is formed around the wireless power supply device. Such EMF is harmful to the human body and may cause malfunction or malfunction of other electronic devices have. Therefore, it is necessary to reduce the generation range of the EMF generated in the wireless power supply device.

Generally, when single-phase AC power is used, there is a disadvantage that the range of the magnetic field generated in the wireless power supply device is wide and the magnetic field is attenuated severely, resulting in a reduction in the efficiency of the entire device. When 3-phase AC power is used, the range of the generated magnetic field is narrow, but the voltage of the induced electromotive force is lowered.

6 is a perspective view showing an E-type power supply device 10 used in a general wireless power supply device using a single-phase AC.

When single-phase AC power is supplied from the external power source to the power supply unit 12, a magnetic field is generated in the E-type power supply core 11 formed by arranging the magnetic field forming units E side by side by electromagnetic induction. However, due to the structure of the E-type power supply core 11, the generation range of the magnetic field is wide, and thereby the magnetic field is severely attenuated, thereby deteriorating the efficiency of the entire wireless power supply device. Also, since the E-type power supply device 10 is structurally bulky, it is disadvantageous in terms of space efficiency and production cost. Further, when single-phase alternating-current power is supplied to the E-type power supply device 10, there is a drawback that the range of generation of the magnetic field is widened due to the characteristics of the single-phase AC power.

Therefore, it is an object of the present invention to provide a wireless power supply apparatus which can supply a three-phase AC voltage to reduce the generation range of a magnetic field and increase the voltage of generated induced electromotive force.

The technical object of the present invention is not limited to the above-mentioned technical objects and other technical objects which are not mentioned can be clearly understood by those skilled in the art from the following description will be.

One embodiment of the wireless power supply apparatus includes a magnetic field forming unit that is formed in a C shape and includes a pair of top surfaces, the top surface includes a magnetic field forming unit that receives electric power to form a magnetic field, A power supply unit having a power supply unit for supplying power; And a current collecting core in which the conductive part is wound, and a current collecting part for transmitting an induced electromotive force induced in the conductive part to the load from the conductive part The three-phase AC power may be supplied to the power supply unit.

The power feeding part may include a power feeding core in which the magnetic field forming part is formed by arranging a plurality of magnetic field forming parts in a predetermined direction, the plurality of power feeding parts are provided, and at least a part of each of the power feeding parts is installed And each of the power supply units may be coupled to each terminal of the supplied three-phase AC power.

The current collecting portion may have a configuration in which an end face of the current collecting core is formed in a concavo-convex shape, the conductive portion is wound in a substantially horizontal direction to the current collecting core, and the conductive portions are arranged in a pair at a central portion of the current collecting portion A plurality of first conductors arranged in a vertical direction and a plurality of second conductors arranged in a pair and arranged on both sides of the current collector.

The wireless power supply device of the above-described embodiment can reduce the range of the magnetic field generated by using the three-phase alternating current power to reduce the damage of the human body or other electromagnetic waves. Further, since the voltage of the induction electromotive force of the current collector can be increased by using the C-type power supply core, the efficiency of the entire device can be improved. In addition, since the C-type power supply core is used, it is possible to increase the space efficiency by reducing the volume of the structure and to reduce the production cost.

1 is a perspective view illustrating a wireless power supply apparatus according to an embodiment of the present invention.
2 is a front view illustrating a wireless power supply apparatus according to an embodiment of the present invention.
3 is a schematic diagram showing a state in which an inverter, a rectifier, and a load are electrically connected to a wireless power supply apparatus according to an embodiment of the present invention.
FIG. 4A is a schematic view showing a state in which each of the coils forming the conductive part used in the wireless power supply device is electrically connected to the rectifier according to the embodiment of the present invention. FIG.
FIG. 4B is a circuit diagram illustrating a state where the coils forming the conductive parts used in the wireless power supply apparatus according to the embodiment of the present invention are connected.
5A to 5C are schematic diagrams showing specifications of each component used in a simulation analysis performed for a performance test of a wireless power supply apparatus according to an embodiment of the present invention.
6 is a perspective view showing an E-type power supply device used in a general wireless power supply device using a single-phase AC.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, embodiments of the present invention will be described in detail. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention, and are actually shown in a smaller scale than the actual dimensions in order to understand the schematic structure.

Also, the terms first and second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1 is a perspective view illustrating a wireless power supply apparatus according to an embodiment of the present invention. 2 is a front view illustrating a wireless power supply apparatus according to an embodiment of the present invention.

The wireless power supply device includes a power feeder 100 and a current collector 200. In one embodiment of the present invention, a three-phase AC power is supplied to the power feeder 100 to generate a magnetic field in the power feeding core 110, the direction of which changes periodically according to the phase change of the three-phase AC power, 200 are disposed on the power feeder 100 to induce an induced electromotive force in accordance with a change in the direction of a magnetic field generated in the power feeding core 110.

The power feeder 100 is electrically connected to an external power source (not shown) and receives a three-phase AC power from the external power source to form a magnetic field, and includes a power feeding core 110 and a power supply unit 120. In an embodiment of the present invention, the three-phase three-wire AC power is supplied to the power feeder 100, so that the power feeder 100 is composed of three pieces. Therefore, the power supply core 110 and the power supply unit 120 constituting the power feeder 100 are each composed of three pieces.

The power feeding core 110 is formed by arranging a plurality of semi-cylindrical magnetic field forming portions 130 and generates a magnetic field when power is supplied from an external power source. The magnetic field is generated by the electromagnetic induction phenomenon, and the magnetic field forming unit 130 is a region where the magnetic field is induced by the electric power supplied to the power supply unit 120. At this time, the power feeding core 110 is composed of three pieces, and each of the power feeding cores 110 is arranged in parallel with each other with a predetermined width.

The magnetic field forming part 130 has a semi-cylindrical shape as a whole. Specifically, a cylinder having a certain thickness in a radial direction and a constant height is cut in a radial direction, and a cut surface forms an upper end surface 131. Therefore, when the magnetic field forming unit 130 is viewed from the front, it has the letter C shape of the alphabet. A plurality of magnetic field forming parts 130 are formed and the magnetic field forming parts 130 are aligned in a longitudinal direction of the first member 121 of the power supplying part 120 to form a power feeding core 110, The core 110 forms a magnetic field surrounding the first member 121.

The top surface 131 is a surface formed on the upper end of the magnetic field forming portion 130. When a magnetic field is generated by supplying power, a magnetic field is mainly formed on the top surface 131. At this time, the direction of the magnetic field changes depending on the direction in which the current flows. When the supplied power is AC, the direction of the current periodically changes, and accordingly, the direction of the magnetic field periodically changes.

At least a part of the magnetic field formed in the power feeding core 110 is formed between the current collecting core 220 and the respective upper end faces 131 and is electrically connected to the conductive part 210 by a magnetic field formed in the current collecting core 220 An induced electromotive force is generated.

In the embodiment of the present invention, the three-phase AC power is supplied to the magnetic field forming unit 130 and the direction changes periodically between the respective top faces 131 according to the phase change of the supplied three-phase AC power. This change in the direction of the magnetic field causes a change in the magnetic flux density, and an induced electromotive force is generated in the current collector 200 due to the change in the magnetic flux density, and power is supplied to the load 500 wirelessly .

The magnetic field generated in the top surface 131 forms a magnetic field in the current collecting core 220 of the current collector 200 so that an induced electromotive force is generated in the conductive portion 210, Is supplied to an electrically connected load (500) or charged into a battery electrically connected to the conductive part (210). Since the induced electromotive force generated in the conductive part 210 is AC when the conductive part 210 is connected to the battery, in order to charge the battery, AC power must be converted into DC power, The rectifier 400 may be electrically connected to the rectifier 400.

On the other hand, the magnetic field forming unit 130 is formed of a material forming an induction magnetic field by receiving electric power. For example, it is appropriate to use ferrite material, which is supplied with electric power by electromagnetic induction and easily forms a magnetic field, as a material of the magnetic field forming portion 130.

The power supply unit 120 is electrically connected to an external power supply and supplies power to the power supply core 110 to form a magnetic field. The power supply unit 120 includes a first member 121 and a second member 122. On the other hand, the power supply unit 120 is provided in three pieces, and each power supply unit 120 is disposed in each power supply core 110. Since three-phase three-wire AC power is supplied from an external power supply, three AC power supply terminals are respectively coupled to each power supply unit 120 composed of three pieces.

The first members 121 are provided in pairs and each first member 121 is disposed in each of the three-piece feeding cores 110 in the longitudinal direction thereof. Specifically, the center portion of the magnetic field forming portion 130 is positioned between the upper and lower first members 121, and is arranged so that the upper surface 131 is oriented substantially vertically.

Accordingly, since the three-piece power feeding cores 110 formed by aligning the magnetic field forming portions 130 in parallel are arranged in parallel with each other, the pieces of each of the pair of first members 121 formed by three pieces Are arranged in parallel. Accordingly, in one embodiment of the present invention, the plurality of magnetic field forming portions 130 are arranged so that the axial direction of the aligned power feeding core 110 and the longitudinal direction of the first member 121 coincide with each other.

The second members 122 are provided as a pair, and serve to connect both ends of each of the pair of first members 121. [ The pair of first members 121 and the pair of second members 122 are connected to each other to constitute a power supply unit 120. The power supply unit 120 having three pieces is connected to a three- When power is supplied to the three-piece power feeding core 110 disposed in the pair of first members 121, an induced magnetic field is generated.

The current collector 200 is disposed above the power feeder 100 at a certain interval from the current collector 200 and is a portion where an induced electromotive force is generated and the induced electromotive force is generated by the load 500, And includes a conductive part 210 and a current collecting core 220. The conductive part 210 and the current collecting core 220 are connected to each other.

The conductive part 210 is a part through which an induced electromotive force induced by a magnetic field generated in the power feeding core 110 flows and includes a first conductor 211 and a second conductor 212. Specifically, the conductive portion 210 is wound around the current collecting core 220, and an electromotive force flows due to the electromagnetic induction phenomenon due to the magnetic field generated in the current collector core 220. At this time, the conductive portion 210 is wound in the substantially vertical direction to the current collecting core 220. On the other hand, it is appropriate that the conductive part 210 is formed of an electrically conductive material through which an electromotive force can flow.

For the sake of convenience, in FIGS. 1 and 2, the conductive part 210 is shown as the integrated type horizontal member 211 and the vertical member 212, but it is not necessarily constituted by an integral rectangular member. The conductive portion 210 may form the conductive portion 210 in the form of a coil wound. In this case, the coil may be a coil bundle type Thereby forming the conductive portion 210. [

The first conductors 211 are arranged in a pair at a central portion of the current collector 200, and each of the first conductors 211 is provided in a plurality and arranged vertically. The number of the first conductors 211 of each pair can be appropriately selected in consideration of the voltage of the induced electromotive force, the size of the current collector 200, and other factors. In the embodiment of the present invention, as shown in FIGS. 1 and 2, the number of the first conductors 211 of each pair is two, and they are arranged vertically.

The second conductors 212 are disposed on both sides of the current collector 200 and are disposed on both sides of the first conductor 211 disposed at the center.

The first conductor 211 and the second conductor 212 are connected to the load 500 and the battery using separate cables so that the first conductor 211 and the second conductor 212 are connected to each other, Or each of the pair of second conductors 212 needs to be electrically insulated. Therefore, it is appropriate that the opposing portions of the first conductor 211 and the second conductor 212 are arranged parallel to each other, but spaced apart from each other by a predetermined distance.

The current collecting core 220 is a region where the conductive portion 210 is wound and has a concave-convex shape in cross-section when viewed from the front. 1 conductor 211 and the second conductor 212 are wound. The magnetic field generated in the power feeding core 110 passes through the power feeding core 110 and the magnetized power feeding core 110 generates an induced electromotive force in the conducting portion 210. When the AC power is input to the power feeding part 100, the direction of the magnetic field generated in the power collecting core 220 periodically changes, and thus the induced electromotive force generated in the conductive part 210 becomes AC.

The current collecting core 220 is formed of a material that generates an induced electromotive force in the conductive part 210 when a magnetic field is formed. For example, when a magnetic field is formed by electromagnetic induction, it is appropriate to use a ferrite material that easily induces an induced electromotive force in a conductor of a caution as a material of the power collecting core 220.

The power feeder 100 is fixedly connected to the ground and is installed at regular intervals on a road or a railway on which a vehicle or the like travels and the power collector 200 is mounted on a vehicle or the like to feed the power feeder 100 at regular intervals As shown in Fig. In such a case, a vehicle or the like requiring a wireless power supply can receive power in a stationary state at a portion where the power feeder 100 is installed, and power can be continuously supplied while the vehicle or the like is moving.

FIG. 3 is a schematic diagram showing a state in which an inverter 300, a rectifier 400, and a load 500 are electrically connected to a wireless power supply apparatus according to an embodiment of the present invention.

The inverter 300 receives power from an external power source and converts the power into three-phase three-wire AC power. The three terminals of three-phase three-wire AC power supplied from the inverter 300 are respectively connected to three-piece power supply units 120 provided in the three-piece power supply unit 100, and are connected to the power supply unit 100 Three-phase AC power is supplied.

The rectifier 400 is electrically connected to the conductive part 210 to convert the induced electromotive force of the alternating current flowing in the conductive part 210 into direct current power. In an embodiment of the present invention, terminals are connected to the first conductor 211, the second conductor 212, and the pair of second conductors 212 to convert AC power into DC power, The rectifiers 400-1, 400-2, and 400-3 are provided.

The load 500 is electrically connected to the rectifier 400 to consume the DC power from the rectifier 400. At this time, the load 500 is a concept including a battery, and in the case of a battery, DC power from the rectifier 400 is stored.

4A is a schematic view showing a state where each of the coils forming the conductive part 210 used in the wireless power supply device is electrically connected to the rectifier 400 according to an embodiment of the present invention. FIG. 4B is a circuit diagram illustrating a state where the coils forming the conductive part 210 used in the wireless power supply device according to the embodiment of the present invention are connected.

The first conductor 211 and the second conductor 212 are configured such that the coil is wound several times and the first conductor 211 is connected to the second coil p2, the third coil p3, a fourth coil p4 and a fifth coil p5 and the second conductor 212 is composed of a first coil p1 and a sixth coil p6. At this time, capacitors c1 to c6 are connected in series to the respective coils.

4A, a connection relationship between each of the coils and the capacitors c1 to c6 except the rectifier 400 is schematically shown in FIG. 4B. The first coil p1 and the second coil p2, the third coil p3 and the fourth coil p4, the fifth coil p5 and the sixth coil p6 are connected in series with each other, The series connection portions are connected in parallel with each other. In FIG. 4B, the terminal of the parallel connection portion is a terminal directly connected to the load 500 in FIG. 4A. As shown in FIG. 4A, AC power having passed through the rectifier 400 enters the load 500. At this time, the state in which the coils are disposed in the current collector 200 is as shown in FIG.

5A to 5C are schematic diagrams showing specifications of each component used in a simulation analysis performed for a performance test of a wireless power supply apparatus according to an embodiment of the present invention.

The second conductor p2, the third coil p3, the fourth coil p4, and the second coil p2 are connected to the first conductor 211, And the fifth coil p5 is wound with the coil 10 times. And the second conductor 212 is wound on the first coil p1 and the sixth coil p6 10 times, respectively. The arrangement relationship between the coils and the capacitors c1 to c6 is the same as described with reference to Figs. 4A and 4B. The specifications of the virtual wireless power supply used in the simulation analysis are as described in Figs. 5A to 5C.

The power supplied to the feeder 100 in the simulation is three-phase three-wire AC power having a current of 600A. At this time, the phase difference of the current is 120 degrees. That is, if the phase of the first line of the three phases is -120 degrees, the second line has a phase of 0 degrees and the third line has a phase of 120 degrees.

Table 1 shows the simulation result values.

Induced electromotive force of each coil (unit: V) p1 p2 p3 p4 p5 p6 medium Maximum value 1120 1950 1923 1935 1114 1908 3317 Effective value 792 1379 1360 1368 788 1349 2346

In this case, the average value refers to the voltage of the part connected in parallel, and the connecting part of the first coil p1 and the second coil p2 connected in parallel to each other, the connecting part of the third coil p3 and the fourth coil p4, Voltages at both ends of the connecting portion of the fifth coil p5 and the sixth coil p6 are the same. Therefore, the average value of the voltage derived from the simulation results is the value obtained by dividing the sum of the voltages of the respective coils by 3, the number of parallel connections. The average value of the voltages is the same as the voltage of the electric power that has passed through the rectifier 400.

로 나눈 값이다. 결국, 시뮬레이션 결과로부터 얻을 수 있는 유도기전력은 상기 평균값 중 실효값 2346V 이다. 이 값은 일반적인 단상교류를 사용하는 E형 전력공급장치(10)를 구비한 무선 전력공급장치에서 공급전류가 600A인 경우 유도기전력이 1600V 내외인 것에 비해 높은 전압을 가진다.On the other hand, the effective value of AC power is the maximum value

. As a result, the induced electromotive force obtained from the simulation result is an effective value of 2346 V among the average values. This value has a higher voltage than the 1600 V induced electromotive force when the supply current is 600 A in the wireless power supply apparatus having the E-type power supply apparatus 10 using general single-phase AC.

The magnetic field generating range of the power feeding core 110 in which the C-shaped magnetic field forming unit 130 is arranged is narrower than that of the other types of the power feeding core 110. [ This is because the magnetic field forming unit 130 has a relatively small structure and a pair of upper surfaces 131 in which magnetic fields are mainly formed are positioned close to each other, The distance is also shortened.

The magnetic field formed in such a small range has a small magnetic flux attenuation. This is because the attenuation of the magnetic flux increases as the distance in the space where the magnetic field is formed becomes longer. Since the power supply core 110 of the present invention has a small magnetic flux attenuation, the power loss of the wireless power supply can be reduced and the induction electromotive force of a relatively high current and voltage can be obtained . In particular, it can be seen that the voltage of the induced electromotive force is higher than that of the wireless power supply with the E-shaped power supply 10 using the general single-phase alternating current through the above-described simulation.

Further, since the power supply uses three-phase alternating current instead of single-phase alternating current, the present invention is advantageous in that the generation range of the magnetic field is narrowed due to the nature of three-phase alternating current.

 In addition, since the feeder 100 of the present invention has a simple structure as compared with a wireless power supply device of another structure, it is easy to manufacture and can save manufacturing cost. Particularly, since the volume of the power supply core 110 is small, There is an advantage that the entire electric power supply apparatus can receive a small space restriction. Further, since the generation range of the magnetic field is small as a whole, the present invention has the advantage of reducing the generation range of the EMF, reducing harmful effects to the human body caused by the EMF, malfunction of the electronic equipment, and malfunction.

While only a few are described above in connection with the embodiments of the present invention, various other forms of implementation are possible. The technical contents of the embodiments described above may be combined in various forms other than the mutually incompatible technologies, and may be implemented in a new embodiment through the same.

10: E type power supply device 11: E type power supply core
E: magnetic field forming part 12: electric power supply part
100: feeding part 110: feeding core
120: power supply unit 121: first member
122: second member 130: magnetic field forming part
131: top surface 200: collector
210: conductive part 211: first conductor
212: second conductor 220: current collecting core
300: inverter 400: rectifier
500: load p1: first coil
p2: second coil p3: third coil
p4: fourth coil p5: fifth coil
p6: sixth coil c1 to c6: capacitor

Claims (3)

A power supply unit including a magnetic field forming unit formed in a C shape and including a pair of upper surfaces and the upper surface forming a magnetic field by receiving electric power and a power supply unit for supplying electric power to the magnetic field forming unit; And
And a power collecting part having a conductive part through which the induced electromotive force induced by the magnetic field generated in the power feeding core flows and a current collecting core around which the conductive part is wound and for sending an induced electromotive force induced in the conductive part to the load from the conductive part ,
And the three-phase AC power is supplied to the power feed unit. The method according to claim 1,
Wherein the power-
Wherein the power supply unit includes a plurality of power supply units, at least a part of each of the power supply units is installed in a longitudinal direction of the power supply core, and each of the power And the supply unit is coupled to each terminal of the supplied three-phase alternating-current power. The method according to claim 1,
The current collector
Wherein an end face of the current collector is formed in a concavo-convex shape, the conductive portion is wound in a substantially horizontal direction to the current collector,
The conductive portion includes a first conductor disposed in a pair at a central portion of the current collector portion and provided in a plurality of pairs and arranged vertically, and a second conductor arranged in a pair and disposed on both sides of the current collector portion, respectively Wherein the wireless power supply is a wireless power supply.

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