Wireless electric vehicle charging system

Abstract

The present invention relates to a wireless charging system for charging an electric vehicle battery. The wireless charging system comprises: a wireless transmission rod in which a plurality of transmission coil units are formed to be spaced apart from each other in a longitudinal direction; and a wireless reception unit into which the wireless transmission rod is inserted and which has reception coil units respectively corresponding to the transmission coil units, wherein the output from the wireless reception unit may be supplied to the electric vehicle battery. According to the present invention, coupling efficiency between the wireless transmission and reception coils can be increased, and charging current capacity can be increased.

Description

Electric vehicle wireless charging system

[0001] The present invention relates to a wireless charging system for an electric vehicle, and more particularly, to a wireless charging system for an electric vehicle, which comprises a wireless transmitting rod formed by spacing a plurality of transmitting coil parts apart in the length direction, and a wireless receiving unit into which the wireless transmitting rod is inserted, which includes a receiving coil part corresponding to each of the transmitting coil parts, and which increases coupling efficiency between the transmitting and receiving coils and increases charging current capacity, thereby being capable of charging an electric vehicle battery.

[0002] With the recent rise of electric vehicles, the need for expanded electric vehicle charging infrastructure has also increased rapidly. Most electric vehicle charging systems currently in use typically utilize wired connections.

[0003] Figure 1 is a drawing showing a conventional electric vehicle wired charging system, where (a) shows a shape in which a charging connector is connected to an electric vehicle, and (b) shows a wired system configuration.

[0004] A charging connector (920) is inserted into a charging inlet (910) installed in an electric vehicle (900). The charging connector (920) is connected to the charging inlet (910) via a wire, and supplies power received from the power supply unit (1000) to the electric vehicle battery unit (930), thereby enabling charging.

[0005] Conventional wireless charging systems for electric vehicles, such as this one, rely on wired connections, requiring an external environment to protect the exposed connections. These systems are typically installed indoors, such as underground parking lots, or, if installed outdoors, require a structure with a roof to protect the exposed parts from rain and other environmental factors. This presents a significant obstacle to building charging infrastructure.

[0006] To avoid these drawbacks, some wireless charging methods have been proposed, but the low wireless charging efficiency and large power waste are hindering the spread of wireless charging systems and preventing their widespread adoption.

[0007] Therefore, when charging electric vehicles wirelessly, it is urgent to develop technology that can wirelessly transmit large power capacities while minimizing loss.

[0008] The technical problem to be solved by the present invention is to provide a wireless charging system for electric vehicles capable of charging electric vehicles by increasing the coupling between a transmitting coil and a receiving coil in a wireless charging coil and forming a plurality of transmitting sections to enable high-capacity power transmission with low loss and efficiency.

[0009] The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0010] The wireless charging system for an electric vehicle of the present invention for solving the above technical problem is a wireless charging system for charging an electric vehicle battery, comprising: a wireless transmitting rod having a plurality of transmitting coil parts formed to be spaced apart in the length direction; a wireless receiving unit having a receiving coil part corresponding to each of the transmitting coil parts; and into which the wireless transmitting rod is inserted; and an output of the wireless receiving unit can be supplied to the electric vehicle battery.

[0011] In some embodiments of the present invention, the transmission coil unit may include a shaft formed in a cylindrical shape, a transmission shielding member surrounding the shaft, a transmission coil wound around the transmission shielding member, and a transmission circuit unit supplying an alternating current to the transmission coil.

[0012] In some embodiments of the present invention, the receiving coil unit may include a receiving coil that receives an alternating magnetic field generated from the transmitting coil, a receiving shielding member that surrounds the receiving coil, and a receiving circuit unit that converts an alternating current of the receiving coil into a direct current.

[0013] In some embodiments of the present invention, the shaft may be formed of a material having high thermal conductivity for heat dissipation of the transmission circuit unit or may include a heat dissipation hole.

[0014] In some embodiments of the present invention, the shaft and the transmission circuit may be connected to each other by a heat dissipation medium for heat dissipation of the transmission circuit.

[0015] In some embodiments of the present invention, the wireless transmitter may further include a transmitter handle and a transmitter cover.

[0016] In some embodiments of the present invention, the transmitter handle and / or the transmitter cover may include a waterproof sealing portion.

[0017] In some embodiments of the present invention, the transmitter cover may include an elastic protrusion.

[0018] In some embodiments of the present invention, the wireless receiver may further include a receiver housing.

[0019] In some embodiments of the present invention, the insertion port of the receiver housing may be characterized in that a negative gradient is formed in the direction of the inlet of the insertion port.

[0020] In some embodiments of the present invention, a groove is formed on the upper portion of the insertion port of the receiver housing, into which the protrusion can be caught.

[0021] In some embodiments of the present invention, the receiver housing and / or the receiver body may include a waterproof sealing portion.

[0022] In some embodiments of the present invention, each of the wireless transmitter and the wireless receiver may further include at least one.

[0023] In some embodiments of the present invention, a switching unit may be further included for selectively connecting one of the pre-installed charging terminal and the wireless receiver.

[0024] The wireless charging system for an electric vehicle according to the present invention enables power transmission with low loss by increasing the coupling between the transmitter and receiver of a wireless charging coil, and transmits a large capacity of power by additionally forming the transmitter and receiver in parallel, and can easily increase the power transmission capacity by modularizing the transmitter.

[0025] The electric vehicle wireless charging system according to the present invention also includes a waterproof structure, so that the wireless charging system can be installed and operated without being restricted by indoor or outdoor usage environments.

[0026] Figure 1 is a drawing showing a conventional electric vehicle wired charging system.

[0027] FIG. 2 is a drawing showing an electric vehicle wireless charging system according to one embodiment of the present invention.

[0028] FIG. 3 is a drawing showing a wireless transmitter according to one embodiment of the present invention.

[0029] Fig. 4 is a diagram showing the circuit connection of the wireless transmitter according to Fig. 3.

[0030] FIG. 5 is a drawing showing a wireless receiving unit according to one embodiment of the present invention.

[0031] Fig. 6 is a diagram showing the circuit connection of the receiver according to Fig. 5.

[0032] FIG. 7 is a drawing showing a switching unit of an electric vehicle wireless charging system according to one embodiment of the present invention.

[0033] FIG. 8 is a flow chart illustrating a control unit of an electric vehicle wireless charging system according to one embodiment of the present invention.

[0034] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0035] “And / or” includes each and every combination of one or more of the items mentioned.

[0036] The terminology used herein is for the purpose of describing embodiments only and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise. As used herein, the terms "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, operations, and / or elements mentioned.

[0037] Additionally, throughout the specification, when a part is said to be "connected" to another part, this includes not only cases where it is "directly connected," but also cases where it is "indirectly" or "electrically connected" with other members or components in between.

[0038] Additionally, throughout the specification, the description that each layer (film), region, pattern or structure is formed "on" or "under" the substrate, each layer (film), region, pad or pattern includes both being formed directly or through the interposition of another layer. The criteria for being on / over or under / under each layer are explained based on the drawings.

[0039] Additionally, expressions such as 'first, second', etc. are used only to distinguish between multiple components, and do not limit the order or other characteristics between the components.

[0040] In addition, the flowcharts illustrated in the drawings are merely exemplary sequences for obtaining the most desirable results in carrying out the present invention, and it is obvious that other steps may be added or some steps may be deleted.

[0041] Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used in their common sense to those of ordinary skill in the art to which the present invention pertains. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0042] An electric vehicle wireless charging system according to one embodiment of the present invention is described with reference to drawings.

[0043] FIG. 2 is a drawing showing an electric vehicle wireless charging system according to one embodiment of the present invention, in which (a) shows a shape in which a wireless transmitting rod is connected to an electric vehicle and (b) shows a system configuration.

[0044] Referring to FIG. 2, a wireless charging system for charging an electric vehicle battery unit (930) includes two wireless transmitting rods (101, 102) and two wireless receiving units (201, 202) into which the wireless transmitting rods (101, 102) are each inserted, and the output of the wireless receiving units (201, 202) can be supplied to the electric vehicle battery unit (930).

[0045] At this time, a charging inlet (910), which is a pre-installed charging terminal, and a switching unit (950) that selectively connects one of the wireless receiving units (201, 202) to the electric vehicle battery unit (930) may be further included.

[0046] Referring to (a) of FIG. 2, two wireless transmitting rods (101, 102) can be inserted into two wireless receiving portions (201, 202) formed on a part of an electric vehicle rear lamp to wirelessly transmit power.

[0047] Referring to (b) of FIG. 2, before power is supplied from the wireless transmitter (101, 102), power supplied from the pre-installed charging inlet (910) is connected to the electric vehicle battery unit (930), but when power is supplied from the wireless transmitter (101, 102), power that is replaced by the output of the wireless receiver (201, 202) that is wirelessly transmitted through a predetermined confirmation process can be supplied to the electric vehicle battery unit (930). The predetermined confirmation process will be described later with reference to FIG. 7 and FIG. 8, which illustrate a flowchart of a switching unit (950) and a control unit of the switching unit (950).

[0048] According to one embodiment of the present invention, the wireless transmitter (101, 102) and the wireless receiver (201, 202) are each composed of two, but each may be composed of one and there is no limitation on the number.

[0049] First, the wireless transmitter (101, 102) and wireless receiver (201, 202) will be described in detail.

[0050] FIG. 3 is a drawing showing a wireless transmitter rod according to one embodiment of the present invention, wherein (a) is a cross-sectional view of a transmitter coil module, (b) is a cross-sectional view of the transmitter coil module connected, (c) is a perspective view of the transmitter coil module connected, (d) is a perspective view of the transmitter rod housing and handle, and (e) is a perspective view of the wireless transmitter rod fully assembled.

[0051] Fig. 4 is a diagram showing the circuit connection of the wireless transmitter according to Fig. 3.

[0052] A wireless transmitter (100) of a wireless charging system according to one embodiment of the present invention may include a plurality of transmitter coil sections spaced apart in the length direction and may include a transmitter handle (171) and a transmitter cover (173).

[0053] Referring to (a) of FIG. 3, the transmission coil unit may be in the form of a transmission coil module, with a shaft (150) formed in a cylindrical shape, and a transmission shielding member (130) surrounding the shaft (150) may be formed. A transmission coil (110) may be wound around the outside of the transmission shielding member (130), and a transmission circuit unit (180) may be installed inside the shaft (150).

[0054] The above-mentioned transmission shielding member (130) is installed to prevent the magnetic field generated from the transmission coil from leaking and causing unnecessary influence to the outside, and is preferably a ferrite core with excellent electromagnetic wave blocking properties, but is not limited thereto.

[0055] The direct current power supplied from the power supply unit is converted into a high-frequency alternating current in the transmission circuit unit (180) and supplied to the transmission coil (110), and the transmission coil (110) can form an alternating magnetic field.

[0056] In this way, a plurality of modularized transmission coils (110) can be additionally connected, and in one embodiment of the present invention, a case is shown where six modules are connected in parallel.

[0057] Figure 3 (b) is a cross-sectional view showing six transmitting coils (111, 112…116) connected in parallel.

[0058] A plurality of transmitter coil modules can be connected sequentially in parallel. The shaft (50) of the transmitter coil module has a cylindrical pipe shape, and since the inner diameter of one side is smaller than the outer diameter of the other side, it can be inserted and joined with a force fit with the shaft (50) of an adjacent transmitter coil module.

[0059] Referring to Fig. 4, the transmission circuit sections (181, 182…186) of six transmission coil modules are sequentially connected in parallel, and each transmission circuit section (181, 182…186) may include a transmission circuit section input terminal (180A), a transmission circuit section output terminal (180B), and an AC generator. The AC generator may be connected to each of the transmission coils (111, 112…116).

[0060] A DC power is supplied from a transmitter circuit input terminal (180A), and the DC power is supplied to an AC generator within the transmitter circuit (181, 182…186) to be converted into AC and then supply high-frequency AC current to the transmitter coils (111, 112…116). The transmitter circuit input terminal (180A) is simultaneously connected to a transmitter circuit output terminal (180B) to supply DC power to an adjacent transmitter coil module.

[0061] The input terminal (180A) of the transmitter circuit can be installed as a female connector, and the output terminal (180B) of the transmitter circuit can be installed as a male connector, so that they can be inserted and connected to each other when connecting to an adjacent transmitter module.

[0062] When six transmitter coil modules are combined, the DC power supplied from the transmitter power circuit (187) to the first transmitter circuit (181) can be supplied to all of the first transmitter circuit (181), the second transmitter circuit (82), and the sixth transmitter circuit (186).

[0063] That is, the above-mentioned transmitting circuit unit can supply power to an AC generator inside the transmitting circuit unit and simultaneously supply power to another adjacent transmitting circuit unit.

[0064] In this way, the transmitter coil module is connected by having the shaft and the transmitter circuit inserted into each other, and multiple units can be easily connected in parallel.

[0065] Figures 3 (b) and (c) show a cross-sectional view and a perspective view of a transmitter formed by connecting six transmitter coil modules in parallel, and (d) shows a transmitter rod cover (173) and a transmitter rod handle (171).

[0066] The wireless transmitter (100) can be completed by assembling the transmitter rod cover (173) and the transmitter rod handle (171) that surround the above-mentioned combined transmitter coil module.

[0067] In this way, the wireless transmitter rod can easily increase the transmission power capacity by additionally connecting the transmitter coil modules that can be commonly applied in parallel according to the power requirements of the product.

[0068] The above-mentioned transmitter handle (171) and / or transmitter cover (173) may include a waterproof sealing portion for waterproofing at the joint. A first sealing portion (165) may be formed on the transmitter handle (171), and a second sealing portion (166) may be formed on the transmitter cover (173). In this case, both of the first sealing portions (165) and the second sealing portions (166) may be installed, or only one of the two may be installed. In this way, the wireless transmitter (100) including the waterproof sealing portion may have a waterproof function.

[0069] In order to minimize the mutual influence of the magnetic fields generated from each of the above-described transmitting coil units, each transmitting coil unit may be positioned at a predetermined interval. In one embodiment of the present invention, the interval may be adjusted by adjusting the length of the shaft (150) within the transmitting coil module.

[0070] The above shaft (150) can be formed of a non-magnetic or weakly magnetic material to reduce mutual interference between the transmission coils.

[0071] Additionally, the shaft (150) may be formed of a material with high thermal conductivity to facilitate the release of heat generated by the transmission circuit (180).

[0072] Therefore, the material of the shaft (150) may preferably be a non-magnetic or weakly magnetic metal with high thermal conductivity to reduce mutual interference between transmission coils and simultaneously dissipate heat.

[0073] The shaft (150) may include a heat dissipation hole (151) for heat dissipation of the transmission circuit unit (180). In addition, the shaft (150) and the transmission circuit unit (180) may be connected to each other by a heat dissipation medium for heat dissipation of the transmission circuit unit (180). The heat dissipation hole (151) may serve to release heat generated in the transmission circuit unit (180) to the outside of the shaft (150), and the heat dissipation medium may transfer heat generated in the transmission circuit unit (180) to the shaft (150) having high thermal conductivity. In one embodiment of the present invention, a rectangular parallelepiped-shaped heat dissipation pad (153) may be used as the heat dissipation medium. The heat dissipation pad (153) is installed so as to be in contact with the heat-generating portion of the substrate of the transmission circuit unit (180) and the shaft (150), so as to quickly transfer heat generated from the transmission circuit unit (180) to the shaft (150) made of a metal material, thereby enhancing the heat dissipation effect.

[0074] The above-described transmitter cover (173) may include an elastic transmitter protrusion (175). The transmitter protrusion (175) may be formed in the shape of a ring that is arranged perpendicular to the length direction of the transmitter cover (173). The transmitter protrusion (175) may be attached to the wireless transmitter (100) using an elastic rubber material. When the wireless transmitter (100) is inserted into the wireless receiver (200), the transmitter protrusion (175) may be caught in a concave groove of the receiver housing, which will be described later, so as not to easily fall out.

[0075] FIG. 5 is a drawing showing a wireless receiver according to one embodiment of the present invention, wherein (a) is a cross-sectional view of a receiver coil module, (b) is a perspective view showing the receiver coil module connected, (c) is a perspective view showing the receiver housing and the receiver body, and (d) is a perspective view showing the wireless receiver assembled.

[0076] Fig. 6 is a diagram showing the circuit connection of the wireless receiver according to Fig. 5.

[0077] A wireless receiving unit (200) of a wireless charging system according to one embodiment of the present invention includes a receiving coil unit corresponding to each of the transmitting coil units, and includes a receiving unit housing (253) in which the receiving coil units are installed, and into which a wireless transmitting rod (100) can be inserted.

[0078] Referring to (a) of FIG. 5, the receiving coil unit may include a receiving coil (220) that receives an alternating magnetic field generated from the transmitting coil (110) in the form of a receiving coil module, a receiving shielding member (240) that surrounds the receiving coil (220), and a receiving circuit unit (290) that converts the alternating current of the receiving coil into a direct current.

[0079] The above-mentioned receiving shielding member (240) is installed to prevent the magnetic field generated from the transmitting coil from leaking and causing unnecessary influence to the outside, and is preferably a ferrite core having excellent electromagnetic wave blocking properties, but is not limited thereto.

[0080] The above-mentioned receiving coil (220) can receive a magnetic field generated from the transmitting coil (110). The above-mentioned receiving circuit unit (290) can convert the received high-frequency alternating current into direct current.

[0081] In this way, a plurality of modularized receiving coils (220) can be additionally connected, and in one embodiment of the present invention, a case is shown where six modules are connected in parallel.

[0082] Figure 5 (b) is a cross-sectional view showing six receiving coils (221, 222 … 226) connected in parallel.

[0083] Referring to Fig. 6, the receiving circuit sections (291, 292…296) of six receiving coil modules are sequentially connected, and each receiving circuit section (291, 292…296) may include a receiving circuit section input terminal (290A), a receiving circuit section output terminal (290B), and a rectifier. The rectifier section may be connected to each of the receiving coils (221, 222…226).

[0084] The high-frequency alternating current induced and output in the above-mentioned receiving coil (221, 222…226) can be rectified into direct current in a rectifier and output to the receiving circuit output terminal (290B) through a power separation diode (D).

[0085] Since each receiving circuit input terminal (290A) and receiving circuit output terminal (290B) are connected in parallel with a connector wire, the receiving circuit can connect the output voltage of the receiving circuit of another adjacent receiving coil unit.

[0086] When six receiving coil modules are combined, the outputs of the rectifiers of the first to sixth receiving circuits (291 to 296) are combined through their respective power separation diodes (D) and output to the receiving power circuit (297) to be used as power for charging the electric vehicle battery. At this time, the power separation diode (D) can prevent current from leaking to an adjacent receiving circuit. If the wireless transmitting rod is not sufficiently inserted into the wireless receiving unit due to the user's carelessness, a low voltage may be output from the receiving circuit. The power separation diode (D) can prevent leakage current from flowing from the other receiving circuit unit where a high voltage is output to the receiving circuit unit where a low voltage is output.

[0087] The shape in which six receiving coil modules are connected in this way is shown in the perspective view of Fig. 5 (b).

[0088] Referring to (c) and (d) of FIG. 5, after the six receiving coil modules and the receiving power circuit unit (297) are combined, the combined modules can be assembled into the receiving unit housing (253). A hollow cylindrical insertion hole is formed in the receiving unit housing (253), and the module can be inserted into and assembled on the outer surface of the insertion hole. That is, the outer surface of the insertion hole can be formed in a shape in which the receiving coils surround it.

[0089] A wireless transmitter rod (100) can be inserted into a hollow, concave insertion hole formed on the outside of the receiver housing (253).

[0090] The above receiver housing (253) can be assembled with a receiver body (256) that acts as another case that surrounds the receiver. The wireless receiver of the present invention can be completed by assembling the receiver housing (253) to the receiver body (256).

[0091] In this way, the wireless receiving coil unit can easily increase the receiving power capacity by additionally connecting receiving coil modules that can be commonly applied in parallel according to the transmission power requirements of the product.

[0092] In one embodiment of the present invention, the receiver housing (253) may be a rear lamp housing of an existing electric vehicle, and the receiver body (256) may be a counterpart mechanism to which the existing rear lamp housing is assembled.

[0093] That is, the existing rear lamp housing of an electric vehicle can be separated, replaced with the wireless receiver of the present invention, and then assembled and installed.

[0094] A seal for waterproofing may be included in the joint of the receiver housing (253) and / or the receiver body (256). A third sealing portion (267) may be formed in the receiver housing (253), and a fourth sealing portion (268) may be formed in the receiver body (256). In this case, both of the third sealing portions (267) and the fourth sealing portion (268) may be installed, or only one of the two. In this way, the wireless receiver (200) including the waterproof sealing portion may have a waterproof function.

[0095] The insertion port of the above receiver housing (253) may have a negative gradient formed in the direction of the insertion port entrance. This is to allow foreign substances, especially rainwater, that may enter the insertion port to be naturally discharged.

[0096] Since the above insertion port has a negative slope, the wireless transmitter rod (100) may not be fixed when inserted and may fall out. To prevent this, a receiver housing groove (254) may be formed on the upper portion of the insertion port of the receiver housing (253) into which the transmitter rod protrusion (175) may be caught.

[0097] The above-mentioned receiver housing groove (254) can be formed only on the upper part of the receiver housing (253). This is because if it is installed on the lower part of the receiver housing (253), foreign substances may enter and accumulate in the receiver housing groove (254).

[0098] The above-mentioned transmitter cover (173) and receiver housing (253) can be formed of a high-strength plastic material, and the high-strength plastic can be, more specifically, one of PI (Poly Imide), PMMA (Polymethyl methacrylate), and PC (Polycarbonate) materials.

[0099] PI (Poly Imide) is a thin, highly flexible, high-performance industrial material that can withstand temperatures as low as -269°C and temperatures as high as 400°C. It also boasts strong chemical and abrasion resistance, making it widely used in applications requiring stable performance in harsh environments.

[0100] PMMA (Polymethyl methacrylate) is a transparent thermoplastic polymer compound known as acrylic, acrylic glass, etc., and is widely used in mechanical structures.

[0101] PC (Polycarbonate) is widely used as a component of electronic devices because it has the characteristics of good electrical insulation, dimensional stability, fire extinguishing properties, acid resistance, high weather resistance, and high impact resistance.

[0102] FIG. 7 is a drawing showing a switching unit of an electric vehicle wireless charging system according to one embodiment of the present invention.

[0103] Referring to FIG. 7, the existing charging inlet (910) installed in the electric vehicle (900) is input to one side of the switch (951) added according to the present invention.

[0104] In addition, the output voltages Vs1 and Vs2 of the first wireless receiver (201) and the second wireless receiver (202) are input to the switching control unit (953), respectively, and the output voltages Vs1 and Vs2 are combined through diodes D1 and D2, respectively, and input to the other side of the switch (951) and the switching unit battery (955).

[0105] The above switching unit battery (955) is installed to ensure the stability of the power supply of the circuit of the switching unit of the wireless charging system according to the present invention, and enables the switch (951) to operate stably.

[0106] The above switch (951) may be configured as a relay switch, and the output of the relay switch is fixed to one side of the switch with a mechanical spring structure before the driving signal is transmitted as 'High'. If the relay driving signal is transmitted as 'H', the switch can be switched to the other side.

[0107] FIG. 8 is a flow chart illustrating a control unit of an electric vehicle wireless charging system according to one embodiment of the present invention.

[0108] Referring to FIG. 8, the switching control unit (953) can first determine whether the circuit of the switching unit is stable. This can ensure the stability of the switching operation by waiting for a certain period of time so as not to react to chattering or noise when a contact is made.

[0109] If the output voltages Vs1 and Vs2 of the first wireless receiver (201) and the second wireless receiver (202) are higher than the set reference voltage, that is, if Vs1>Vref1 or Vs2>Vref2, the drive signal of the switch (951) can be output as 'H'. At this time, the switching stability can be improved by outputting the drive signal with a delay of a certain period of time (X seconds).

[0110] An electric vehicle wireless charging system according to one embodiment of the present invention can transmit and receive a total of 3 kW of power by configuring six 500 W wireless power transmission units in parallel. Due to its structurally strong magnetic flux coupling, the transmission and reception coil coupling coefficient is 97%, achieving a power transmission efficiency of 99.5%.

[0111] Also, charging is possible in any environment, whether snow or rain, by simply inserting the wireless transmitter, and since it has a dual structure that includes two transmitters and receivers, charging is possible at a total of 6kW.

[0112] As such, the electric vehicle wireless charging system according to the present invention can increase power transmission efficiency through high coupling between each transmitting coil and receiving coil, and, if necessary, can enable high-capacity power transmission and reception by connecting additional modules in parallel. Furthermore, the sealed, waterproof structure and the low-profile insertion port allow for charging functionality that is unaffected by location and environment.

[0113] Although the present invention has been described as above, those skilled in the art will recognize that the present invention can be implemented in other forms while maintaining the technical spirit and essential features of the present invention.

[0114] The scope of the present invention will be fundamentally determined by the patent claims, but it should be interpreted that not only the configuration directly derived from the description of the patent claims, but also all changes or modified forms derived from equivalent configurations are included in the scope of the present invention.

Claims

1. A wireless charging system for charging electric vehicle batteries. A wireless transmitting rod formed by having multiple transmitting coil sections spaced apart in the longitudinal direction; and It includes a wireless receiving unit in which the wireless transmitting rod is inserted, and includes a receiving coil unit corresponding to each of the transmitting coil units. An electric vehicle wireless charging system, wherein the output of the wireless receiver is supplied to the electric vehicle battery.

2. In paragraph 1, An electric vehicle wireless charging system, wherein the above-described transmitting coil section includes a shaft formed in a cylindrical shape, a transmitting shielding member surrounding the shaft, a transmitting coil wound around the transmitting shielding member, and a transmitting circuit section supplying an alternating current to the transmitting coil.

3. In paragraph 1, An electric vehicle wireless charging system, wherein the receiving coil section includes a receiving coil that receives an alternating magnetic field generated from the transmitting coil, a receiving shielding member that surrounds the receiving coil, and a receiving circuit section that converts the alternating current of the receiving coil into a direct current.

4. In paragraph 2, An electric vehicle wireless charging system, wherein the shaft is formed of a material having high thermal conductivity for heat dissipation of the transmitting circuit or includes a heat dissipation hole.

5. In paragraph 4, An electric vehicle wireless charging system, characterized in that the shaft and the transmission circuit are connected by a heat dissipation medium for heat dissipation of the transmission circuit.

6. In paragraph 1, An electric vehicle wireless charging system, wherein the wireless transmitter further includes a transmitter handle and a transmitter cover.

7. In paragraph 6, An electric vehicle wireless charging system, wherein the transmitter handle and / or the transmitter cover include a waterproof sealing portion.

8. In paragraph 6, An electric vehicle wireless charging system, wherein the above-mentioned transmitter cover includes an elastic protrusion.

9. In paragraph 1, An electric vehicle wireless charging system, wherein the wireless receiver further includes a receiver housing.

10. In paragraph 9, An electric vehicle wireless charging system, characterized in that the insertion port of the above receiver housing has a negative gradient formed in the direction of the inlet of the insertion port.

11. In clause 8 or 9, An electric vehicle wireless charging system, characterized in that a groove is formed on the upper portion of the insertion port of the receiver housing into which the protrusion can be caught.

12. In paragraph 9, An electric vehicle wireless charging system, wherein the receiver housing and / or the receiver body include a waterproof sealing portion.

13. In paragraph 1, An electric vehicle wireless charging system further comprising at least one of the above wireless transmitting rod and the above wireless receiving unit.

14. In paragraph 1, An electric vehicle wireless charging system further comprising a switching unit selectively connecting one of the installed charging terminals and the wireless receiver.

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