KR102058540B1 - Wireless Electric Power Supply Apparatus - Google Patents

Abstract

Embodiment of the present invention relates to a wireless power supply that can supply a three-phase AC voltage to reduce the generation range of the magnetic field, and to increase the voltage of the induced electromotive force.

Description

Wireless Power Supply Apparatus {Wireless Electric Power Supply Apparatus}

Embodiment of the present invention relates to a wireless power supply that can supply a three-phase AC voltage to reduce the generation range of the magnetic field, and to increase the voltage of the induced electromotive force.

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

In general, an electric vehicle refers to a vehicle that uses electricity as a power source for moving the vehicle. To operate the electric vehicle, the electric vehicle runs on electric power charged by charging a battery mounted in the electric vehicle. In order to charge the electric vehicle, a person or an auxiliary device for charging the electric vehicle directly connects a charging wire to the vehicle, which not only inconveniences the user, but also causes electric shock when the user attaches the plug to the electric vehicle. There is a risky problem. As such, a method of charging a battery of an electric vehicle using a charging wire may cause inconvenience to a user and may cause an electric shock. Accordingly, the research and development of a wireless power supply device capable of charging a battery of an electric vehicle wirelessly has been actively conducted. It is becoming.

In general, a wireless power supply device uses a method of supplying power to form a magnetic field and using induced electromotive force generated by a change in the magnetic field. However, when the wireless power supply is in operation, an electro-magnetic field (EMF) is formed around the wireless power supply, which is harmful to the human body and may cause malfunction or malfunction of other electronic devices. have. Therefore, there is a need to reduce the generation range of the EMF generated in the wireless power supply.

In general, when single-phase AC power is used, the magnetic field generated in the wireless power supply is wide, and the magnetic field is severely attenuated. When using three-phase AC power, the magnetic field generated is narrow, but the voltage of the induced electromotive force is lowered.

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

When the single-phase AC power is supplied to the power supply unit 12 from an external power source, a magnetic field is generated in the E-type feed core 11 formed by forming the magnetic field forming unit E side by side by electromagnetic induction. However, the E-type power supply core 11 has a large magnetic field generation range due to its structure, which causes a great attenuation of the magnetic field, thereby lowering the efficiency of the entire wireless power supply. In addition, since the E-type power supply 10 is structurally bulky, it is disadvantageous in terms of space efficiency and manufacturing cost. In addition, when the single-phase AC power is supplied to the E-type power supply device 10, the generation range of the magnetic field is wide due to the characteristics of the single-phase AC power.

Accordingly, an embodiment of the present invention is to provide a wireless power supply that can supply a three-phase AC voltage to reduce the generation range of the magnetic field, and to increase the voltage of the induced electromotive force.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

An embodiment of the wireless power supply includes a top surface formed in a C-shape and provided in pairs, the top surface having a magnetic field forming portion for receiving a power to form a magnetic field, and supplying power to the magnetic field forming portion. A power supply unit having a power supply unit to supply the power supply unit; And a current collector having a conductive portion through which induced electromotive force induced by a magnetic field generated by the power feeding core flows, and a current collecting core to which the conductive portion is wound, and a current collector which sends the induced electromotive force induced by the conductive portion from the conductive portion to a load. However, the power supply may be a three-phase AC power is supplied.

The power supply unit may include a power supply core in which a plurality of magnetic field forming units are aligned in a predetermined direction, and the power supply unit is provided in plurality, and at least a portion of each power supply unit is installed in a longitudinal direction of the power supply core. Each of the power supply units may be combined with each terminal of the three-phase AC power supplied.

The current collector may have a cross-section of the current collector core having an uneven shape, and the conductive part may be wound in a direction substantially horizontal to the current collector core, and the conductive parts may be disposed in pairs at the center of the current collector part. It may include a plurality of first conductors provided in a plurality and disposed up and down, respectively, and a second conductor provided in pairs and disposed on both sides of the current collector.

The wireless power supply of the above-described embodiment can reduce the range of the magnetic field generated by using the three-phase AC power supply power to reduce the damage to the human body or other electromagnetic. In addition, since the voltage of the induced electromotive force of the current collector part can be increased by using the C-type feed core, the efficiency of the entire apparatus can be improved. In addition, since the C-type feed core is used, the structural volume is small, thereby improving space efficiency and reducing manufacturing costs.

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

With reference to the accompanying drawings will be described an embodiment according to the present invention; As the inventive concept allows for various changes and numerous modifications, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific form disclosed, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements. In the accompanying drawings, the dimensions of the structure is shown to be larger than the actual size for clarity of the invention, or to reduce the actual size to understand the schematic configuration.

In addition, terms such as first and second may be used to describe various components, but the components 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 the second component, and similarly, the second component may also be referred to as the 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. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

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

The wireless power supply device includes a power supply unit 100 and a current collector 200. In one embodiment of the present invention, the power supply unit 100 receives a three-phase AC power to generate a magnetic field that periodically changes the direction according to the phase change of the three-phase AC power to the power supply core 110, the current collector ( In the 200, the induced electromotive force is induced in accordance with the change in the direction of the magnetic field generated in the feed core 100 and the feed core 110.

The power supply unit 100 is electrically connected to an external power source (not shown), serves to form a magnetic field by receiving three-phase AC power therefrom, and includes a power supply core 110 and a power supply unit 120. In one embodiment of the present invention, since the three-phase three-wire AC power is supplied to the power supply unit 100, the power supply unit 100 is composed of three pieces. Therefore, the power supply core 110 and the power supply unit 120 constituting the power supply unit 100 are also composed of three pieces, respectively.

The feed core 110 is formed by aligning a plurality of semi-cylindrical magnetic field forming units 130 and forms a magnetic field when electric power is supplied from an external power source. The formation of such a magnetic field is generated by an electromagnetic induction phenomenon, and the magnetic field forming unit 130 is a portion where the magnetic field is induced by the power supplied to the power supply unit 120. At this time, the power feeding core 110 is provided with three pieces, each of the power feeding core 110 is disposed in parallel with each other with a predetermined width.

The magnetic field forming unit 130 has a semi-cylindrical shape as a whole. Specifically, the cylindrical shape having a constant thickness and a constant height in the radial direction is cut in the radial direction, the cut surface forms the top surface (131). Therefore, when viewed from the front of the magnetic field forming unit 130 has a letter "C" shape of the alphabet. The magnetic field forming unit 130 is provided in plurality, and each of the magnetic field forming units 130 is aligned in the longitudinal direction of the first member 121 of the power supply unit 120 to form the power feeding core 110. The core 110 forms a magnetic field that surrounds the first member 121.

The top surface 131 is each surface formed at the top of the magnetic field forming unit 130, and when a power is supplied to generate a magnetic field, a magnetic field is mainly formed at the top surface 131. At this time, the direction of the magnetic field varies depending on the direction in which the current flows. If the supplied power is alternating current, the direction of the current is changed periodically, so the direction of the magnetic field is also periodically changed.

On the other hand, at least a portion of the magnetic field formed in the power feeding core 110 is formed between the current collector core 220 and each of the top surfaces 131 to the conductive portion 210 by a magnetic field formed in the current collector core 220. Induction electromotive force is generated.

In one embodiment of the present invention, the three-phase AC power is supplied to the magnetic field forming unit 130, the direction is periodically changed between the upper end surface 131 according to the phase change of the supplied three-phase AC power. The change in the direction of the magnetic field brings a change in the magnetic flux density, the induced electromotive force is generated in the current collector 200 by the change of the magnetic flux density, and the power is wirelessly supplied to the load 500 by the generation of the induced electromotive force. Can be.

The magnetic field generated on the upper surface 131 forms a magnetic field in the current collector core 220 of the current collector 200, and thus induced electromotive force is generated in the conductive part 210, and the induced electromotive force is connected to the conductive part 210. The battery 500 may be supplied to a load 500 electrically connected thereto or charged in a battery electrically connected to the conductive part 210. On the other hand, when the conductive unit 210 is connected to the battery, since the induced electromotive force generated in the conductive unit 210 is alternating current, in order to charge power to the battery, the AC power must be converted into DC power, so that the conductive unit 210 and the battery are in between. The rectifier 400 can be electrically connected to.

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

The power supply unit 120 is electrically connected to an external power source and serves to supply power for forming a magnetic field to the power feeding core 110, and 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 of the power supply core (110). Since three-phase three-wire AC power is supplied from an external power source, three AC power supply terminals are respectively coupled to each power supply unit 120 having three pieces.

The first member 121 is provided in pairs, and each of the first members 121 is disposed in the longitudinal direction of each of the three-piece feed cores 110. Specifically, the central portion of the magnetic field forming unit 130 is located between the upper and lower first members 121 and arranged in a plurality, the upper surface 131 is disposed to substantially face the vertical direction.

Therefore, since the three pieces of power feeding core 110 formed by aligning the magnetic field forming unit 130 are arranged in parallel with each other, the pieces of each of the pair of first members 121 provided with three pieces are also different from each other. Arranged in parallel. Therefore, in one embodiment of the present invention, the plurality of magnetic field forming units 130 are arranged such that the axial direction of the aligned power feeding core 110 coincides with the longitudinal direction of the first member 121.

The second member 122 is provided in a pair, and serves to connect both ends of each of the pair of first members 121. A pair of first members 121 and a pair of second members 122 are connected to each other to form a power supply unit 120, and the power supply unit 120, which is provided in three pieces, has a three-phase alternating current from an external power source. When the electric power is supplied and electric power is supplied to the three-piece feed core 110 disposed on the pair of first members 121, an induction magnetic field is generated.

The current collector 200 is disposed above the power supply unit 100 at a spaced interval from the current collector 200, and is a site where induction electromotive force is generated, and the generated induction electromotive force is a load 500, a battery, or the like. It is sent to the device used, and includes a conductive portion 210 and the current collector core 220.

The conductive portion 210 is a portion where 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 electroconductive portion 210 is wound around the current collector core 220 and electromotive force flows due to electromagnetic induction by a magnetic field generated in the current collector core 220. At this time, the conductive portion 210 is wound in a direction substantially horizontal to the current collector core 220. Meanwhile, the conductive portion 210 may be formed of an electrically conductive material through which electromotive force may flow.

Meanwhile, for convenience, although the conductive part 210 including the horizontal member 211 and the vertical member 212 of the integrated form is illustrated in FIGS. 1 and 2, the conductive member 210 is not necessarily configured as a rectangular member. As in the case of a generator or the like using an electromagnetic induction phenomenon, the conductive part 210 may form the conductive part 210 in the form of a coil wound, in which case the coil is wound in the current collector core 220 multiple times The conductive portion 210 is formed.

The first conductors 211 are arranged in pairs at the center of the current collector 200, and each of the first conductors 211 is provided in plural and disposed up and down. The number of the first conductors 211 of each pair may be appropriately selected in consideration of the voltage of the induced electromotive force, the size of the current collector 200, and the like. In the embodiment of the present invention, as shown in Figs. 1 and 2, the number of each pair of first conductors 211 is provided with two and arranged up and down, respectively.

The second conductors 212 are disposed in pairs on both sides of the current collector 200, and are disposed on both sides with a pair of first conductors 211 disposed in the center portion therebetween.

On the other hand, since the first conductor 211 and the second conductor 212 are connected to a load 500, a battery, etc. using separate cables, respectively, the first conductor 211 and the second conductor 212. Alternatively, each of the pair of second conductors 212 needs to be electrically insulated. Therefore, the parts facing each other of the first conductor 211 and the second conductor 212 may be disposed in parallel with each other, and may be disposed at a predetermined distance apart from each other.

The current collector core 220 is a portion in which the conductive portion 210 is wound, and when viewed from the front, the cross section is formed in an uneven shape up and down, and the conductive portion 210 is formed at the upper and lower portions of the current collector core 220. The first conductor 211 and the second conductor 212 are wound. The magnetic field generated in the feed core 110 penetrates the feed core 110, and the magnetized feed core 110 generates induced electromotive force in the conductive portion 210. At this time, when AC power is input to the power supply unit 100, the direction of the magnetic field generated in the current collector core 220 is periodically changed, and thus the induced electromotive force generated in the conductive unit 210 becomes AC.

In addition, the current collector core 220 is formed of a material that generates an induced electromotive force in the conductive portion 210 when a magnetic field is formed. For example, when a magnetic field is formed by an electromagnetic induction phenomenon, it is appropriate to use a ferrite material that easily generates induced electromotive force in the conductor of caution as the material of the current collector core 220.

On the other hand, the power supply unit 100 is fixedly coupled to the ground and installed at regular intervals on roads, railroads, etc. through which vehicles pass, and the current collector unit 200 is mounted on a vehicle, and the power supply unit 100 is installed at regular intervals. Can be movable in the direction. In such a case, the vehicle, which requires the wireless power supply, may not only be supplied with power in a stationary state in which the power supply unit 100 is installed, but may also be continuously supplied with the vehicle as it moves.

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

The inverter 300 receives power from an external power source and converts the three-phase three-wire AC power. Three terminals of the three-phase three-wire AC power supplied from the inverter 300 are connected to the three-piece power supply unit 120 provided in the three-piece power supply unit 100, respectively, 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 through the conductive part 210 into direct current power. In an embodiment of the present invention, a terminal is connected to each of the first conductor 211, the second conductor 212, and the pair of second conductors 212, thereby converting AC power into DC power. Rectifiers 400-1, 400-2, and 400-3 are provided.

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

4A is a schematic diagram illustrating a state in which the coils and the rectifier 400 that form the conductive part 210 used in the wireless power supply device according to an embodiment of the present invention are electrically connected to each other. 4B is a circuit diagram illustrating a state in which coils forming conductive parts 210 used in a wireless power supply device according to an embodiment of the present invention are connected.

The first and second conductors 211 and 212 have a coil wound several times, and the first conductor 211 has a second coil p2, a third coil p3, and a fourth coil. (p4) and the fifth coil (p5), the second conductor 212 is composed of the first coil (p1) and the sixth coil (p6). At this time, capacitors c1 to c6 are connected in series to each coil.

In FIG. 4A, the connection relationship between the coils and the capacitors c1 to c6 excluding the rectifier 400 is briefly 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 sites are connected in parallel with each other. In FIG. 4B, the terminal of the parallel connection portion refers to a terminal directly connected to the load 500 in FIG. 4A, and as illustrated in FIG. 4A, AC power passing through the rectifier 400 enters the load 500. At this time, the coils are arranged in the current collector 200 as shown in FIG.

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

In performing the simulation, the conductive part 210 was formed in a form in which the coil was wound several times, and the second conductor p2, the third coil p3, the fourth coil p4, and the first conductor 211 were formed. The coil is wound 10 times on the fifth coil p5. In addition, the second conductor 212 is configured to be wound around the first coil p1 and the sixth coil p6 10 times. The arrangement relationship between the coils and the capacitors c1 to c6 is as described with reference to FIGS. 4A and 4B. In addition, the specification of the virtual wireless power supply used in the simulation analysis is as described in Figures 5a to 5c.

In the simulation, the power supplied to the power supply unit 100 is a 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 °, the second line has a phase of 0 ° and the third line has a phase of 120 °.

Table 1 is a table showing the simulation results.

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

At this time, the average value refers to the voltage of the parts connected in parallel, the connection portion of the first coil p1 and the second coil p2, the connection portion of the third coil p3 and the fourth coil p4 connected in parallel with each other and The voltages at both ends of the connection portion of the fifth coil p5 and the sixth coil p6 are the same. Therefore, the average value of the voltages derived from the simulation results is the sum of the voltages of each coil divided by 3, the number of parallel connections. The average value of the voltage is equal to the voltage of the power passing 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.

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

The feeding core 110 in which the C-shaped magnetic field forming unit 130 is used in the present invention has a narrower generation range of the magnetic field than the other feeding cores 110. This is because the magnetic field forming unit 130 has a relatively small structural size, and a pair of top surfaces 131, in which a magnetic field is mainly formed, is located close to each other. This is because the distance is also shortened.

The magnetic field formed in such a small range has a small attenuation of the magnetic flux. This is because the attenuation of the magnetic flux increases as the distance in the space where the magnetic field is formed increases. Since the power supply core 110 of the present invention has a small attenuation of the magnetic flux, it is possible to reduce the power loss during the wireless power supply, and to obtain the induced electromotive force having a relatively high current and voltage, compared to other wireless power supply devices having other structures. There is this. In particular, it can be seen that the voltage of the induced electromotive force is higher than that of the wireless power supply having the E-type power supply 10 using the general single-phase AC through the above simulation.

In addition, the present invention has the advantage that the generation range of the magnetic field is narrowed due to the characteristics of the three-phase alternating current because the supply power is used instead of single-phase alternating current.

 In addition, the power supply unit 100 of the present invention has a simple structure, compared to other wireless power supply of the structure, it is easy to manufacture, can save the manufacturing cost, in particular, the volume of the power supply core 110 is small wireless The entire power supply has the advantage of being less space constrained. In addition, the present invention has a merit that the generation range of the magnetic field as a whole, to reduce the generation range of the EMF to reduce the harmful effects on the human body due to the EMF, failure of the electronic device, malfunction.

Although only a few of the above has been described in connection with the embodiment of the present invention, various forms of implementation are possible. The technical contents of the above-described embodiments may be combined in various forms as long as they are not incompatible with each other, and thus may be implemented in a new embodiment.

10: Type E power supply 11: Type E feeding core
E: magnetic field forming unit 12: power supply unit
100: feeding part 110: feeding core
120: power supply unit 121: first member
122: second member 130: magnetic field forming portion
131: top surface 200: current collector
210: conductive portion 211: first conductor
212: Second Challenger 220: Collector Core
300: inverter 400: rectifier
500: load p1: first coil
p2: second coil p3: third coil
p4: fourth coil p5: fifth coil
p6: 6th coil c1-c6: capacitor

Claims (3)

It is formed in a C-shape and includes a top surface provided in pairs, the top surface is a power supply core for supplying power to the power supply core and the power supply core to which a plurality of magnetic field forming portion is arranged to form a magnetic field receiving power; A feeder provided; And
And a current collector having a conductive part through which induced electromotive force induced by a magnetic field generated by the power feeding core flows, and a current collecting core to which the conductive part is wound, and a current collector which sends the induced electromotive force induced by the conductive part from the conductive part to a load. ,
The feeding cores are provided in three pieces, and the feeding cores are spaced apart from each other and arranged in parallel with each other.
The power supply unit is a wireless power supply, characterized in that the three-phase AC power is supplied. The method of claim 1,
The feed section,
The magnetic field forming unit includes a plurality of feeding cores arranged in a predetermined direction, wherein the power supply unit includes a plurality of power supply units, and at least a portion of each of the power supply units is installed in the longitudinal direction of the feeding core, and each of the power Supply unit wireless power supply, characterized in that coupled to each terminal of the supplied three-phase AC power. The method of claim 1,
The current collector,
The cross section of the current collector core is formed in an uneven shape, the conductive portion is wound in a direction substantially horizontal to the current collector core,
The conductive part includes a first conductor disposed in a pair at a central portion of the current collector and provided in plurality, and disposed up and down, respectively, and a second conductor provided in a pair and disposed at both sides of the current collector. Wireless power supply, characterized in that.

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