Wireless charging device for electric vehicle, wireless charging system including same, and method for controlling wireless charging thereof

Abstract

A wireless charging system for an electric vehicle, according to an embodiment of the present invention, includes: a ground assembly disposed on the ground; a vehicle assembly mounted on the electric vehicle; a moving member for moving the ground assembly; and a wireless charging device for controlling the ground assembly and the moving member and supplying power to the vehicle assembly through the ground assembly. The wireless charging device controls the moving member to move the ground assembly in a direction perpendicular to the ground on the basis of vehicle information of the electric vehicle.

Description

Wireless charging device for electric vehicle, wireless charging system including same, and wireless charging control method thereof

[0001] The present invention relates to a wireless charging device for an electric vehicle, a wireless charging system including the same, and a wireless charging control method thereof.

[0002] A wireless charging system for an electric vehicle includes a wireless charging device, a ground assembly (GA), and a vehicle assembly (VA). In the case of a static wireless power transfer method, the ground assembly is placed on the floor of a parking lot, and the electric vehicle can be charged while parked via the vehicle assembly. In the case of a dynamic wireless power transfer method, the ground assembly is placed on the road, and the electric vehicle can be charged while driving via the vehicle assembly.

[0003] Power can be wirelessly transferred from the ground assembly to the vehicle assembly through magnetic induction or magnetic resonance between the transmitting coil of the ground assembly and the receiving coil of the vehicle assembly. In this case, the transmitting coil of the ground assembly and the receiving coil of the vehicle assembly need to be aligned to increase the efficiency of wireless power transfer.

[0004] The technical problem to be solved by the present invention is to provide a wireless charging device for an electric vehicle, a wireless charging system including the same, and a wireless charging control method thereof.

[0005] Another technical problem to be achieved by the present invention is to provide an alignment method for aligning a ground assembly and a vehicle assembly of a wireless charging device for wireless charging of an electric vehicle.

[0006] A wireless charging system for an electric vehicle according to one embodiment of the present invention includes a ground assembly disposed on the ground, a vehicle assembly mounted on the electric vehicle, a movable member for moving the ground assembly, and a wireless charging device for controlling the ground assembly and the movable member and supplying power to the vehicle assembly through the ground assembly, wherein the wireless charging device controls the movable member to move the ground assembly in a direction perpendicular to the ground based on vehicle information of the electric vehicle.

[0007] The above vehicle information may include location information of the vehicle assembly mounted on the electric vehicle.

[0008] The wireless charging device can control the height at which the movable member raises the ground assembly in a direction perpendicular to the ground based on position information of the vehicle assembly.

[0009] The wireless charging device can further control the speed at which the movable member raises the ground assembly in a direction perpendicular to the ground based on position information of the vehicle assembly.

[0010] The wireless charging device can verify the position of the ground assembly based on a coupling coefficient between the ground assembly and the vehicle assembly.

[0011] The vehicle information may further include at least one of size information of a receiving coil included in the vehicle assembly, center information of a receiving coil included in the vehicle assembly, battery status information connected to the vehicle assembly, and tire pressure information of the electric vehicle.

[0012] The above moving member may include a mounting plate for mounting the ground assembly and a motor connected to the mounting plate for driving movement of the plate.

[0013] The above-mentioned movable member may include a mounting plate for mounting the ground assembly, a pressure plate to which pressure of the electric vehicle is applied, and a lever member for raising the mounting plate by the pressure applied to the pressure plate.

[0014] A method for aligning a ground assembly and a vehicle assembly of a wireless charging system for an electric vehicle according to one embodiment of the present invention includes the steps of detecting parking of an electric vehicle having a vehicle assembly mounted on the ground assembly placed on the ground, obtaining vehicle information of the electric vehicle, and moving the ground assembly in a direction perpendicular to the ground based on the vehicle information.

[0015] The above vehicle information may include location information of the vehicle assembly mounted on the electric vehicle.

[0016] The moving step may include a step of raising the ground assembly in a direction perpendicular to the ground based on position information of the vehicle assembly.

[0017] The moving step may further include a step of controlling a speed at which the ground assembly is raised in a direction perpendicular to the ground based on position information of the vehicle assembly.

[0018] The moving step may further include a step of verifying the position of the ground assembly based on a coupling coefficient between the ground assembly and the vehicle assembly.

[0019] According to an embodiment of the present invention, the ground assembly and the vehicle assembly of a wireless charging system for an electric vehicle can be precisely aligned. This can improve wireless power efficiency.

[0020] FIG. 1 is a block diagram showing a charging system for an electric vehicle according to one embodiment of the present invention.

[0021] FIG. 2 is a block diagram of a wireless charging system for an electric vehicle according to one embodiment of the present invention.

[0022] Figure 3 is a wireless charging system according to one embodiment of the present invention.

[0023] FIG. 4 is a block diagram of a wireless charging device according to one embodiment of the present invention.

[0024] FIG. 5 is a flowchart illustrating a method of aligning a ground assembly and a vehicle assembly of a wireless charging system according to one embodiment of the present invention.

[0025] FIG. 6 is a flowchart of a method for moving a ground assembly perpendicular to the ground by a wireless charging device according to one embodiment of the present invention.

[0026] FIG. 7 is a drawing for explaining the operating principle of a moving member according to one embodiment of the present invention.

[0027] FIG. 8 is a drawing for explaining the operating principle of a moving member according to another embodiment of the present invention.

[0028] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0029] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0030] In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0031] Additionally, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0032] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0033] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0034] These terms are intended only to distinguish one component from another, and are not intended to limit the nature, order, or sequence of the component.

[0035] And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, it may include not only cases where the component is directly connected, coupled or connected to the other component, but also cases where the component is 'connected', 'coupled' or 'connected' by another component between the component and the other component.

[0036] Additionally, when described as being formed or arranged "above or below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below", it can include the meaning of a downward direction as well as an upward direction based on one component.

[0037] Hereinafter, embodiments will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or corresponding components are given the same reference numbers, and redundant descriptions thereof will be omitted.

[0038] FIG. 1 is a block diagram showing a charging system for an electric vehicle according to one embodiment of the present invention, and FIG. 2 is a block diagram of a wireless charging system for an electric vehicle according to one embodiment of the present invention.

[0039] Referring to FIG. 1, an electric vehicle (EV) 10 can be charged by a wireless charging system (20). In this specification, an electric vehicle (10) means a vehicle propelled by an electric motor that draws current from a rechargeable storage battery or other portable energy storage device.

[0040] According to an embodiment of the present invention, the electric vehicle (10) may be a vehicle that can be recharged through a wireless charging method without using a physical plug and socket.

[0041] Referring to FIG. 2, a wireless charging system (20) includes a wireless charging device (100), a ground assembly (GA, 200), and a vehicle assembly (VA, 300). The ground assembly (200) includes a transmitting coil and may further include a control circuit for controlling the transmitting coil. The vehicle assembly (300) includes a receiving coil and may further include a control circuit for controlling the receiving coil.

[0042] In the case of a static wireless power transfer method, the ground assembly (200) is placed on the floor of a parking lot and is controlled by a wireless charging device (100). The vehicle assembly (300) can be mounted on an electric vehicle (10). Generally, the vehicle assembly (300) can be mounted on the lower part of the electric vehicle (10). Here, the lower part of the electric vehicle (10) can mean a surface facing the ground. The lower part of the electric vehicle (10) can be used interchangeably with the lower surface or the floor surface. Accordingly, the receiving coil of the vehicle assembly (300) can be aligned to face the transmitting coil of the ground assembly (200) placed on the floor of the parking lot and then wirelessly receive power from the transmitting coil of the ground assembly (200).

[0043] The wireless charging device (100) is connected to the ground assembly (200), controls the ground assembly (200), and supplies power to the ground assembly (200). The wireless charging device (100) may be an electric vehicle supply equipment (EVSE) or a part of the EVSE.

[0044] An electric vehicle (10) equipped with a vehicle assembly (300) enters a parking area where a ground assembly (200) is arranged, and accordingly, the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300) can be aligned. However, the fine alignment between the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300) may vary depending on the skill of the driver driving the electric vehicle (10), the position of the vehicle assembly (300) mounted on the electric vehicle (10), or the size of the vehicle assembly (300) mounted on the electric vehicle (10). According to an embodiment of the present invention, it is intended to improve the efficiency of wireless power transmission by precisely aligning the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300).

[0045] FIG. 3 is a wireless charging system according to one embodiment of the present invention, FIG. 4 is a block diagram of a wireless charging device according to one embodiment of the present invention, and FIG. 5 is a flowchart showing a method of aligning a ground assembly and a vehicle assembly of a wireless charging system according to one embodiment of the present invention.

[0046] Referring to FIG. 3, the wireless charging system (20) includes a wireless charging device (100), a ground assembly (200), a vehicle assembly (300), and a movable member (600).

[0047] The wireless charging device (100) controls the ground assembly (200) and supplies power to the vehicle assembly (300) through the ground assembly (200).

[0048] The ground assembly (200) is movably placed on the ground, includes a transmitting coil, and may further include a control circuit for controlling the transmitting coil.

[0049] The vehicle assembly (300) is mounted on an electric vehicle (10), includes a receiving coil, and may further include a control circuit that controls the receiving coil. Although not shown, an EVCC (electric vehicle communication controller) is mounted on the electric vehicle (10), and the receiving coil of the vehicle assembly (300) or the control circuit that controls the receiving coil may be connected to the EVCC and controlled by the EVCC.

[0050] When the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300) are precisely aligned, the efficiency of wireless power transmission can be improved. In particular, the coupling coefficient between the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300) varies depending on the vertical distance between the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300), which can affect the wireless charging efficiency. In the present specification, a horizontal direction may mean a direction parallel to the ground, and a vertical direction may mean a direction perpendicular to the ground. When the horizontal direction is the X-axis direction or the Y-axis direction, the vertical direction may be the Z-axis direction. In the present specification, a horizontal distance may mean a distance in a direction parallel to the ground, and a vertical distance may mean a distance in a direction perpendicular to the ground.

[0051] According to an embodiment of the present invention, the ground assembly (200) is mounted on a movable member (600), and the wireless charging device (100) controls the ground assembly (200) and the movable member (600).

[0052] The moving member (600) moves in a direction perpendicular to the ground under the control of the wireless charging device (100).

[0053] To this end, referring to FIG. 4, the wireless charging device (100) includes a communication unit (110), a control unit (120), and a power supply unit (130). The communication unit (110) communicates with an electric vehicle (10) or an EVCC mounted on the electric vehicle (10). The control unit (120) controls the ground assembly (200) and controls a movable member (600) on which the ground assembly (200) is mounted. The power supply unit (130) supplies power to a vehicle assembly (300) mounted on the electric vehicle (10) through the ground assembly (200). The communication unit (110) and the control unit (120) of the wireless charging device (100) may be a SECC (supply equipment communication controller). The control unit (120) controls the moving member (600) to move the ground assembly (200) in a direction perpendicular to the ground based on the vehicle information of the parked electric vehicle (10).

[0054] More specifically, when an electric vehicle (10) approaches a parking area, the communication unit (110) of the wireless charging device (100) obtains vehicle information of the electric vehicle (10) by establishing a connection with the electric vehicle (10) or an EVCC mounted on the electric vehicle (10). Here, the parking area means an area where one electric vehicle (10) can be parked, and generally has a rectangular shape and can be distinguished from other parking areas by a border line.

[0055] Here, the vehicle information may include at least one of vehicle type information of the electric vehicle, location information of a vehicle assembly mounted on the electric vehicle, type information of a vehicle assembly mounted on the electric vehicle, and size information of a vehicle assembly mounted on the electric vehicle.

[0056] Depending on the type of electric vehicle, the distance from the ground to the bottom of the electric vehicle may vary. In this specification, the bottom of the electric vehicle means the surface facing the ground, and may also be referred to as the lower surface or the bottom of the electric vehicle. When the wireless charging device (100) obtains the vehicle type information of the electric vehicle, the wireless charging device (100) can know the height of the bottom of the electric vehicle (10) parked in the parking area. Typically, the vehicle assembly is placed on the bottom of the electric vehicle and can face the ground assembly placed on the ground. When the wireless charging device (100) further obtains the location information of the vehicle assembly mounted on the electric vehicle, the wireless charging device (100) can know the distance between the ground and the vehicle assembly (300), more precisely, the distance between the ground assembly (200) placed in the parking area and the vehicle assembly (300) mounted on the electric vehicle (10).

[0057] Meanwhile, if the vehicle information further includes size information of the receiving coil included in the vehicle assembly (300) and center information of the receiving coil included in the vehicle assembly (300), precise alignment between the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300) is possible.

[0058] According to an embodiment of the present invention, the vehicle information of the electric vehicle (10) acquired by the communication unit (110) of the wireless charging device (100) may further include battery status information connected to the vehicle assembly (300). Accordingly, the control unit (120) of the wireless charging device (100) may control the power supply amount of the power supply unit (130).

[0059] In addition, according to an embodiment of the present invention, the vehicle information of the electric vehicle (10) acquired by the communication unit (110) of the wireless charging device (100) may further include tire pressure information of the electric vehicle (10). Accordingly, the control unit (120) of the wireless communication device (100) can estimate the distance between the ground assembly (200) and the vehicle assembly (300) more precisely.

[0060] The control unit (120) of the wireless charging device (100) estimates the distance between the ground assembly (200) and the vehicle assembly (300) based on the vehicle information of the electric vehicle (10), and can calculate the elevation height of the ground assembly (200) to maximize the coupling coefficient between the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300). In addition, the control unit (120) of the wireless charging device (100) can control the speed at which the ground assembly (200) is elevated in a direction perpendicular to the ground based on the distance between the ground assembly (200) and the vehicle assembly (300). The speed at which the ground assembly (200) is elevated in a direction perpendicular to the ground may vary depending on the distance between the ground assembly (200) and the vehicle assembly (300). For example, the elevation speed of the ground assembly (200) may be controlled to become slower as the distance between the ground assembly (200) and the vehicle assembly (300) becomes closer. Accordingly, the possibility of the ground assembly (200) and the vehicle assembly (300) colliding with each other can be reduced due to the rapid elevation of the ground assembly (200). In addition, as the distance between the ground assembly (200) and the vehicle assembly (300) becomes closer, it is possible to precisely control the distance between the ground assembly (200) and the vehicle assembly (300). In addition, the control unit (120) of the wireless charging device (100) can verify the position of the ground assembly (200) based on the coupling coefficient between the ground assembly (200) and the vehicle assembly (300). For example, after elevating the ground assembly (200), the wireless charging device (100) can measure the coupling coefficient between the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300). If the coupling coefficient is lower than the reference value, the ground assembly (200) can be further raised so that the distance between the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300) becomes closer.

[0061] Referring to FIG. 5, a wireless charging device (100) detects the parking of an electric vehicle (10) equipped with a vehicle assembly (300) within a parking area (S500). Here, the parking area refers to an area where one electric vehicle (10) can be parked, and generally has a rectangular shape and can be distinguished from other parking areas by a border line. A parking area supporting wireless charging may include at least one ground assembly.

[0062] For this purpose, the wireless charging device (100) may further include a detection unit (not shown). The detection unit (not shown) may be a camera mounted on the wireless charging device (100) or positioned adjacent to the wireless charging device (100). The camera photographs the parking area and can detect parking of an electric vehicle (10) within the parking area. Alternatively, the detection unit (not shown) may be a pressure sensor positioned on the ground of the parking area. The pressure sensor detects pressure applied to the parking area, and when the applied pressure exceeds a reference value, parking of an electric vehicle (10) within the parking area can be detected.

[0063] Next, the wireless charging device (100) acquires vehicle information of the electric vehicle (10) (S510). To this end, the communication unit (110) of the wireless charging device (100) may establish a connection with the electric vehicle (10) or the EVCC mounted on the electric vehicle (10). When establishing the connection, the communication unit (110) of the wireless charging device (100) may receive vehicle information from the electric vehicle (10) or the EVCC mounted on the electric vehicle (10). Here, the vehicle information may include vehicle model information of the electric vehicle. The distance from the ground to the floor surface may vary depending on the vehicle model of the electric vehicle. Accordingly, when the wireless charging device (100) acquires vehicle model information of the electric vehicle, the height of the floor surface of the electric vehicle (10) parked in the parking area can be known. The vehicle information may further include location information of the vehicle assembly mounted on the electric vehicle. Typically, the vehicle assembly is positioned on the floor surface of the electric vehicle and may face the ground assembly positioned on the ground. Accordingly, when the wireless charging device (100) obtains more location information of the vehicle assembly mounted on the electric vehicle, the wireless charging device (100) can know the distance between the ground and the vehicle assembly (300), more precisely, the distance between the ground assembly (200) placed in the parking area and the vehicle assembly (300) mounted on the electric vehicle (10).

[0064] Next, the wireless charging device (100) moves the ground assembly (200) in a direction perpendicular to the ground based on the vehicle information of the electric vehicle (10) (S520). As described above, the wireless charging device (100) can know the distance between the ground and the vehicle assembly (300), more precisely, the distance between the ground assembly (200) placed in the parking area and the vehicle assembly (300) mounted on the electric vehicle (10), based on the vehicle information of the electric vehicle (10). Meanwhile, the coupling coefficient may vary depending on the distance between the ground assembly (200) and the vehicle assembly (300), and the coupling coefficient may be an indicator of the efficiency of wireless charging between the ground assembly (200) and the vehicle assembly (300). Accordingly, the wireless charging device (100) can move the ground assembly (200) in a direction perpendicular to the ground so that the coupling coefficient between the ground assembly (200) and the vehicle assembly (300) is optimized. For example, if the distance between the ground assembly (200) placed in a parking area and the vehicle assembly (300) mounted on the electric vehicle (10) is 50 cm, and the distance at which the coupling coefficient between the ground assembly (200) and the vehicle assembly (300) is optimized is 30 cm, the wireless charging device (100) can raise the ground assembly (200) by an additional 20 cm in a direction perpendicular to the ground.

[0065] FIG. 6 is a flowchart of a method for moving a ground assembly perpendicular to the ground by a wireless charging device according to one embodiment of the present invention.

[0066] Referring to FIG. 6, the wireless charging device (100) elevates the ground assembly (200) in a direction perpendicular to the ground based on the position information of the vehicle assembly (300) (S600). For example, the wireless charging device (100) estimates the distance between the ground assembly (200) and the vehicle assembly (300) based on the vehicle information of the electric vehicle (10), and can calculate the elevation height of the ground assembly (200) to maximize the coupling coefficient between the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300). For example, if the distance between the ground assembly (200) placed in a parking area and the vehicle assembly (300) mounted on the electric vehicle (10) is 50 cm, and the distance at which the coupling coefficient between the ground assembly (200) and the vehicle assembly (300) is optimized is 30 cm, the elevation height of the ground assembly (200) may be 20 cm.

[0067] Next, the wireless charging device (100) controls the speed at which the ground assembly (200) is raised in a direction perpendicular to the ground based on the position information of the vehicle assembly (300) (S610). The speed at which the ground assembly (200) is raised in a direction perpendicular to the ground may vary depending on the distance between the ground assembly (200) and the vehicle assembly (300). For example, as the distance between the ground assembly (200) and the vehicle assembly (300) becomes closer, the rising speed of the ground assembly (200) may be controlled to be slower. That is, as the distance between the ground assembly (200) and the vehicle assembly (300) becomes closer to a distance at which the coupling coefficient is optimized, the rising speed of the ground assembly (200) may be controlled to be slower. Accordingly, the possibility of the ground assembly (200) and the vehicle assembly (300) colliding due to the rapid rising of the ground assembly (200) can be reduced, and more precise movement is possible at a location closer to the distance at which the coupling coefficient is optimized.

[0068] Next, the wireless charging device (100) verifies the position of the ground assembly (200) based on the coupling coefficient between the ground assembly (200) and the vehicle assembly (300) (S620). For example, after elevating the ground assembly (200) through steps S600 and S610, the wireless charging device (100) measures the coupling coefficient between the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300). If the coupling coefficient is lower than a reference value, the ground assembly (200) can be further elevated so that the distance between the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300) becomes closer. Accordingly, even if there is an error in calculating the elevation height of the ground assembly (200) in step S600 or an error in controlling the elevation speed in step S610, it is possible to correct the position of the ground assembly (200).

[0069] Alternatively, the wireless charging device (100) can periodically measure the coupling coefficient between the ground assembly (200) and the vehicle assembly (300) even during charging after elevating the ground assembly (200). Accordingly, if there is a misalignment between the ground assembly (200) and the vehicle assembly (300) during charging, it can be corrected, thereby improving the wireless charging efficiency.

[0070] FIG. 7 is a drawing for explaining the operating principle of a moving member according to one embodiment of the present invention, and FIG. 8 is a drawing for explaining the operating principle of a moving member according to another embodiment of the present invention.

[0071] Referring to FIG. 7, the moving member (600) may include a mounting plate (610) on which the ground assembly (200) is mounted and a motor (620) for raising the plate (610). The motor (620) may be controlled by the control unit (120) of the wireless charging device (100). That is, the control unit (120) of the wireless charging device (100) may control the motor (620) to adjust the raising distance and the raising speed of the mounting plate (610) on which the ground assembly (200) is mounted. Although not shown, the moving member (600) may further include an auxiliary power source that supplies power to the motor (620). Alternatively, the motor (620) may be connected to the power supply unit (130) of the wireless charging device (100) and may receive power from the power supply unit (130).

[0072] Referring to FIG. 8, the moving member (800) may include a mounting plate (810) that mounts the ground assembly (200), a pressure plate (820) to which pressure of the electric vehicle (10) is applied, and a lever member (830) that raises the mounting plate (810) by the pressure applied by the pressure plate (820).

[0073] Here, the tire of the electric vehicle (10) can be placed on the pressure plate (820). When the electric vehicle (10) is parked, pressure is applied to the pressure plate (820), and the mounting plate (810) can be raised by the lever principle of the lever member (830).

[0074] Although not shown, the movable member (800) may further include a stopping means. The stopping means is positioned above the mounting plate (810) and spaced apart from the mounting plate (810). When the mounting plate (810) rises above a predetermined height, the stopping means and the upper surface of the mounting plate (810) come into contact, thereby preventing further rising of the mounting plate (810). Accordingly, collision between the ground assembly (200) and the vehicle assembly (300) can be prevented.

[0075] According to an embodiment of the present invention, the stopping means is arranged on a rail so as to be movable in a direction perpendicular to the ground, and the control unit (120) of the wireless charging device (100) may control the movement of the stopping means. For example, the control unit (120) of the wireless charging device (100) may estimate the maximum elevation height of the ground assembly (200) based on vehicle information of the electric vehicle (10), and control the movement distance of the stopping means according to the estimated maximum elevation height.

[0076] According to an embodiment of the present invention, the movable member may be a hydraulic means that moves by pressure. When an electric vehicle (10) is parked in a parking space, the parking space detects pressure according to the weight of the electric vehicle (10), and the movable member equipped with the ground assembly (200) can be raised by the hydraulic means.

[0077] According to an embodiment of the present invention, the wireless charging system (20) further includes a locking member, and the movable member can be fixed by the locking member. Accordingly, the problem of the distance between the ground assembly mounted on the movable member and the vehicle assembly narrowing or widening due to external impact, etc. during charging can be prevented.

[0078] According to an embodiment of the present invention, upon completion of charging, the movable member equipped with the ground assembly can return to its original position. To this end, the control unit (120) of the wireless charging device (100) can control the descent of the movable member upon completion of charging. Accordingly, upon completion of charging, the electric vehicle (10) can quickly leave the parking area without being obstructed by the raised movable member and ground assembly.

[0079] In an embodiment of the present invention, before moving the ground assembly in the Z-axis direction, the ground assembly may be moved in the X-axis and Y-axis directions. For example, if the movable member is capable of moving not only in the Z-axis but also in the X-axis and Y-axis directions parallel to the ground, the movable member equipped with the ground assembly may move in the X-axis and Y-axis directions to align its center with the vehicle assembly, and then move in the Z-axis direction to narrow the distance from the vehicle assembly.

[0080] Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

Claims

1. In a wireless charging system for electric vehicles, Ground assembly placed on the ground, A vehicle assembly mounted on the above electric vehicle, A moving member for moving the above ground assembly, and A wireless charging device that controls the ground assembly and the movable member and supplies power to the vehicle assembly through the ground assembly, A wireless charging system in which the wireless charging device controls the movable member to move the ground assembly in a direction perpendicular to the ground based on vehicle information of the electric vehicle.

2. In paragraph 1, A wireless charging system wherein the vehicle information includes location information of the vehicle assembly mounted on the electric vehicle.

3. In paragraph 2, A wireless charging system in which the wireless charging device controls the height at which the movable member raises the ground assembly in a direction perpendicular to the ground based on position information of the vehicle assembly.

4. In paragraph 3, A wireless charging system wherein the wireless charging device further controls the speed at which the movable member raises the ground assembly in a direction perpendicular to the ground based on position information of the vehicle assembly.

5. In paragraph 4, A wireless charging system in which the wireless charging device verifies the position of the ground assembly based on a coupling coefficient between the ground assembly and the vehicle assembly.

6. In paragraph 2, A wireless charging system wherein the vehicle information further includes at least one of size information of a receiving coil included in the vehicle assembly, center information of a receiving coil included in the vehicle assembly, battery status information connected to the vehicle assembly, and tire pressure information of the electric vehicle.

7. In paragraph 1, A wireless charging system in which the above-mentioned moving member includes a mounting plate for mounting the ground assembly and a motor connected to the mounting plate for driving movement of the plate.

8. In paragraph 1, A wireless charging system in which the above-mentioned moving member includes a mounting plate for mounting the ground assembly, a pressure plate to which pressure of the electric vehicle is applied, and a lever member for raising the mounting plate by the pressure applied to the pressure plate.

9. In a method for aligning a ground assembly and a vehicle assembly of a wireless charging system for an electric vehicle, A step of detecting parking of the electric vehicle having the vehicle assembly mounted on the ground assembly placed on the ground, A step of obtaining vehicle information of the above electric vehicle, and A step of moving the ground assembly in a direction perpendicular to the ground based on the vehicle information. A sorting method that includes .

10. In paragraph 9, A method of aligning the vehicle information including location information of the vehicle assembly mounted on the electric vehicle.

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