Ground assembly for wireless charging of electric vehicle and method for controlling wireless charging thereof

Abstract

The ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention comprises: a transmission coil; a power supply unit capable of supplying power to the transmission coil; a detection sensor unit capable of detecting an external material in an external material detection area around the transmission coil; and a control unit for detecting the external material by using the detection sensor unit, measuring the distance to the detected external material, determining whether the external material exists within the external material detection area on the basis of the measured distance, and controlling power supplied to the transmission coil on the basis of the determination result. The detection sensor unit includes at least one of a sonar sensor, a lidar, and a camera. The external substance detection area may be within a predetermined distance from the edge of the transmission coil in a direction parallel to the ground surface, and may be within a predetermined distance from the upper portion of the transmission coil in a direction perpendicular to the ground surface.

Description

Ground assembly for wireless charging of electric vehicles and wireless charging control method thereof

[0001] The present invention relates to a ground assembly for wireless charging of an electric vehicle and a wireless charging control method thereof, and more particularly, to a ground assembly for detecting external substances around a transmitting coil for wireless charging of an electric vehicle 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). The electric vehicle can be charged while parked or while driving. When charging while parked, the electric vehicle can be charged using a static wireless power transfer method, and when charging while driving, the electric vehicle can be charged using a dynamic wireless power transfer method. 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] In both static and dynamic wireless power transfer methods, 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. At this time, the transmitting coil of the ground assembly and the receiving coil of the vehicle assembly need to be aligned to increase the efficiency of the wireless power transfer. If foreign objects (foreign object debris (FOD)) exist between the ground assembly and the vehicle assembly, the efficiency of the wireless power transfer may be reduced. In particular, if a foreign object, such as metal, that affects the magnetic field between the transmitting coil and the receiving coil exists between the ground assembly and the vehicle assembly, the temperature of the ground assembly may increase excessively, which may cause an accident such as a fire. Furthermore, the effect may vary depending on the location of the foreign object.

[0004] The technical problem to be achieved by the present invention is to provide a ground assembly capable of detecting a foreign substance within a certain area around a transmitting coil.

[0005] The technical problem to be achieved by the present invention is to provide a ground assembly capable of detecting foreign substances even when foreign substances intrude into the underside of a vehicle during wireless charging of an electric vehicle, and a wireless charging control method thereof.

[0006] A ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention includes a transmitting coil, a power supply unit capable of supplying power to the transmitting coil, a detection sensor unit capable of detecting a foreign substance within a foreign substance detection area around the transmitting coil, and a control unit that detects the foreign substance using the detection sensor unit, measures a distance to the detected foreign substance, determines whether the foreign substance exists within the foreign substance detection area based on the measured distance, and controls power supplied to the transmitting coil based on the determination result, wherein the detection sensor unit includes at least one of a sonar sensor, a lidar, and a camera, and the foreign substance detection area may be within a predetermined distance from an edge of the transmitting coil in a horizontal direction to the ground surface and within a predetermined distance from an upper portion of the transmitting coil in a vertical direction to the ground surface.

[0007] In the ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention, if the detection sensor unit includes a sonar sensor, the sonar sensor may be placed on the side of at least some of the edges of the transmitting coil.

[0008] In the ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention, if the detection sensor unit includes a sonar sensor, the sonar sensor may be placed on the side of at least a portion of the edge of the transmitting coil.

[0009] In the ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention, if the detection sensor unit includes an M-LiDAR (Mechanical LiDAR), the M-LiDAR may be placed at the center upper portion of the transmitting coil.

[0010] In the ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention, if the detection sensor unit includes a camera or S-LiDAR (Solid-State LiDAR),

[0011] The camera or S-lidar may be positioned on at least a portion of the side of the edge of the transmitting coil.

[0012] In the ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention, if the detection sensor unit includes a plurality of cameras or S-lidars, the plurality of cameras or S-lidars may be arranged at the center upper portion of the transmitting coil.

[0013] In a ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention, the foreign material detection area may be determined by considering at least one of the type, arrangement, thickness, and number of turns of the transmitting coil.

[0014] In a ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention, the transmitting coil may partially or entirely protrude from the ground surface.

[0015] In a ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention, the transmitting coil may partially or completely protrude from the ground surface when the electric vehicle is charged.

[0016] In a ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention, the control unit can obtain information about the detected external substance when the external substance is detected.

[0017] In a ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention, the control unit can control power supplied to the transmitting coil by further considering the information on the acquired external material.

[0018] In a ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention, the control unit can control the power supplied to the transmitting coil differently depending on the location within the foreign material detection area where the foreign material is detected.

[0019] In a ground assembly for wireless charging of an electric vehicle according to an embodiment of the present invention, the detection sensor unit can operate when charging of the electric vehicle is initiated.

[0020] A wireless charging control method of a ground assembly according to an embodiment of the present invention includes a step of detecting a foreign substance using a detection sensor unit, a step of measuring a distance to the foreign substance detected using the detection sensor unit, a step of determining whether the foreign substance exists within a foreign substance detection area based on the measured distance, and a step of controlling power supplied to a transmitting coil based on a result of the determination, wherein the detection sensor unit includes at least one of a sonar sensor, a lidar, and a camera, and the foreign substance detection area may be within a predetermined distance from an edge of the transmitting coil in a horizontal direction to the ground surface and within a predetermined distance from an upper portion of the transmitting coil in a vertical direction to the ground surface.

[0021] According to the present invention, when an abnormality is detected during wireless charging, it can be determined whether it is caused by an external substance.

[0022] According to the present invention, if a foreign substance enters during wireless charging, it can respond immediately, thereby solving the problem of charging current leakage or reduced charging efficiency.

[0023] According to the present invention, safety can be improved because measures can be taken before an abnormality occurs due to the intrusion of external substances during wireless charging.

[0024] FIG. 1 is a drawing showing a charging system for an electric vehicle according to one embodiment of the present invention.

[0025] FIG. 2 is a drawing showing a transmitting coil and a foreign material detection area of ​​a ground assembly according to one embodiment of the present invention.

[0026] FIG. 3 is a drawing showing a ground assembly including a sonar sensor for detecting foreign matter according to one embodiment of the present invention.

[0027] FIG. 4 is a drawing showing a ground assembly including an M-lidar for detecting foreign matter according to one embodiment of the present invention.

[0028] FIG. 5 is a drawing illustrating a ground assembly including a camera and / or S-lidar for detecting foreign matter according to one embodiment of the present invention.

[0029] FIG. 6 is a block diagram of a ground assembly included in a wireless charging system for an electric vehicle according to one embodiment of the present invention.

[0030] FIG. 7 is a flowchart of a wireless charging control method of a ground assembly included in a wireless charging system for an electric vehicle according to one embodiment of the present invention.

[0031] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] FIG. 1 is a drawing showing a charging system for an electric vehicle according to one embodiment of the present invention.

[0041] In this disclosure, an electric vehicle (EV) (10) refers to a vehicle propelled by an electric motor that draws current from a rechargeable storage battery or other portable energy storage device. The battery or energy storage device of the electric vehicle (10) can be charged using a physical plug and socket. Alternatively, the battery or energy storage device of the electric vehicle (10) can be charged using a wireless charging method.

[0042] Referring to FIG. 1, an electric vehicle (10) can be charged by a wireless charging system (20). The wireless charging system (20) may include a wireless charging device (100) and a ground assembly (GA, 200) disposed outside the electric vehicle (10) and a vehicle assembly (VA, 300) disposed inside the electric vehicle (10). The ground assembly (200) may include a transmitting coil, a power supply unit capable of converting power supplied from the wireless charging device (100) and supplying power to the transmitting coil, and a control unit capable of controlling the power supply unit. The vehicle assembly (300) may include a receiving coil, a power supply unit capable of supplying power to the receiving coil, and a control unit capable of controlling the power supply unit. In addition, the ground assembly (200) and the vehicle assembly (300) may further include a communication unit.

[0043] In the case of a static wireless power transfer method, at least a part of the ground assembly (200) may be placed on the floor of a parking lot, and the vehicle assembly (300) may be mounted on an electric vehicle (10). Generally, the vehicle assembly (300) may be mounted on the lower part of the electric vehicle (10). Here, the lower part of the electric vehicle (10) may mean a surface facing the ground. The lower part of the electric vehicle (10) may be used interchangeably with the lower surface or the floor surface. Accordingly, the receiving coil of the vehicle assembly (300) may 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).

[0044] The wireless charging device (100) is connected to the ground assembly (200), can control the ground assembly (200), and can supply 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. The wireless charging device (100) may also be directly connected to a user's terminal of an electric vehicle or an electric vehicle to transmit and receive necessary information related to wireless charging.

[0045] FIG. 2 is a drawing showing a transmitting coil and a foreign material detection area of ​​a ground assembly according to one embodiment of the present invention.

[0046] Referring to FIG. 2, a charging system for an electric vehicle may utilize a static wireless power transmission method, and a transmitting coil of a ground assembly may be placed on the floor of a parking lot (400). The transmitting coil (210) may be placed in the center of the floor of the parking lot (400) as shown in FIG. 2, or may be placed on one side of the floor of the parking lot as shown in FIG. 1. According to one embodiment, the transmitting coil (210) may be placed so as to protrude from the ground surface. For example, only a portion of the transmitting coil (210) may protrude from the ground surface. As another example, the entire transmitting coil (210) may protrude from the ground surface. As yet another example, the transmitting coil (210) may protrude from the ground surface when charging an electric vehicle.

[0047] According to one embodiment of the present invention, the ground assembly may include a sensor to detect a foreign substance within a predetermined area around the transmitting coil (210). In the present disclosure, a predetermined area for detecting a foreign substance around the transmitting coil (210) through the sensor may be referred to as a foreign substance detection area (220). The foreign substance detection area (220) may be within a predetermined distance (215) in a horizontal direction from the edge of the transmitting coil (210) to the ground surface, and may be within a predetermined distance (225) in a vertical direction from the upper portion of the transmitting coil to the ground surface. The foreign substance detection area (220) may vary depending on the type and position of the sensor to be placed. In addition, the foreign substance detection area (220) may also vary depending on the type, arrangement, thickness, number of turns, etc. of the transmitting coil. For example, as the number of turns of the transmitting coil increases, the foreign substance detection area (220) may increase.

[0048] Below, various sensors and their arrangements that can be utilized by the ground assembly to detect a foreign material detection area according to one embodiment of the present invention are described.

[0049] FIG. 3 is a drawing showing a ground assembly including a sonar sensor for detecting foreign matter according to one embodiment of the present invention.

[0050] Referring to FIG. 3, the ground assembly may place sonar sensors at at least some of the corners of the transmitting coil to detect foreign matter. FIG. 3 illustrates an example in which a total of eight sonar sensors are placed, two at each corner of the transmitting coil, but the present invention is not limited thereto. For example, the sonar sensors may be placed one at each corner of the transmitting coil, for a total of four, or two at each diagonal direction. In addition, the sonar sensors may be placed at edges rather than corners. The sonar sensors may transmit sound waves in different directions for detecting foreign matter depending on the number and position of the sonar sensors. In addition, the sonar sensors may transmit sound waves with different intensities depending on the range of the set foreign matter detection area (220). The larger the foreign matter detection area (220), the greater the intensity of the sound waves transmitted by the sonar sensors. In addition, the sonar sensors may vary the intensity of the sound waves transmitted depending on the position or number of the sonar sensors. For example, if the number of deployed sonar sensors is large, the intensity of the transmitted sound waves can be reduced, and if the spacing between sonar sensors deployed nearby is narrow, the intensity of the transmitted sound waves can be reduced.

[0051] Referring again to FIG. 3, the sonar sensors may be positioned at the corners or edges of the transmitting coil. However, this does not preclude the sonar sensors from being positioned on the upper surface of the corners or edges of the transmitting coil. The sonar sensors may also be positioned in the center of the side, or on the upper or lower sides. Furthermore, all sonar sensors may be positioned at the same location on the side. However, not all sonar sensors need to be positioned at the same location, and some sonar sensors may be positioned at the upper side of the corner side, while others may be positioned at the lower side of the corner side.

[0052] FIG. 4 is a drawing showing a ground assembly including an M-lidar for detecting foreign matter according to one embodiment of the present invention.

[0053] Referring to FIG. 4, the ground assembly can utilize an M-LiDAR (Mechanical LiDAR) (250) to detect foreign matter. The M-LiDAR (250) can be suitable for scanning a wide range by scanning a laser beam 360 degrees or at a specific angle through mechanical rotation or a mirror. The M-LiDAR (250) can be placed at the center of the transmitting coil. The M-LiDAR (250) can detect whether a foreign matter exists within the foreign matter detection area (220) through rotation. In FIG. 4, the M-LiDAR (250) is placed at the center of the transmitting coil, but is not limited thereto. Since the M-LiDAR (250) can rotate, it can be placed anywhere in the area where the foreign matter detection area (220) can be included in the area where the foreign matter can be detected through the M-LiDAR (250).

[0054] Referring again to FIG. 4, the M-lidar (250) can be placed on the upper surface of the transmitting coil. The M-lidar (250) can scan the external material detection area (220) on the upper surface of the transmitting coil.

[0055] FIG. 5 is a drawing illustrating a ground assembly including a camera and / or S-lidar for detecting foreign matter according to one embodiment of the present invention.

[0056] Referring to FIG. 5, the ground assembly may utilize a camera and / or an S-LiDAR (Solid-State LiDAR) (250) to detect foreign matter. The S-LiDAR can scan a narrower range than the M-LiDAR by electronically scanning a beam using semiconductor technology in a fixed state, but has a simpler structure. The camera and / or S-LiDAR (250) can only scan a narrow range, so it may be placed at the edge of the transmission coil. In one embodiment, only the camera may be used, only the S-LiDAR may be used, or the cameras and / or S-LiDAR may be used in combination. FIG. 5 illustrates an example in which a total of four cameras and / or S-LiDARs (250) are placed at the edge of the transmission coil, but is not limited thereto. For example, a total of two cameras and / or S-LiDARs (250) may be placed in a diagonal direction. The number and / or location of cameras and / or S-lidars may be determined based on the camera's field of view and the S-lidar's scan range. As another example, multiple cameras and / or S-lidars (250) may be placed at the center of the transmitting coil, each capable of scanning different directions.

[0057] Referring again to FIG. 5, the camera and / or S-Lidar may be positioned at the side of the corner or edge of the transmitting coil. The camera and / or S-Lidar may be positioned in the center of the side, similar to the sonar sensor, or may be positioned above or below. All cameras and / or S-Lidar may be positioned in the same location, but they may each be positioned in different locations, or only some may be positioned in different locations.

[0058] In one embodiment, when multiple cameras and / or S-lidars are positioned at the center of the transmitting coil, the multiple cameras and / or S-lidars may be positioned on the upper surface of the transmitting coil, similar to the M-lidar. In this case, the multiple cameras and / or S-lidars may scan the foreign material detection area (220) on the upper surface of the transmitting coil.

[0059] FIG. 6 is a block diagram of a ground assembly included in a wireless charging system for an electric vehicle according to one embodiment of the present invention.

[0060] Referring to FIG. 6, the ground assembly (200) may include a transmission coil (210) that transmits power to a vehicle assembly, a power supply unit (230) that can convert power supplied from a wireless charging device and supply power to the transmission coil (210), a control unit (240) that can control the power supply unit (230), and a detection sensor unit (250) that can detect whether a foreign substance exists in a foreign substance detection area.

[0061] The transmitting coil (210) may be a large coil to transmit high power. The shape of the transmitting coil (210) may have a planar or helical structure, but is not limited thereto. In addition, the size and shape of the transmitting coil (210) may vary depending on the distance from the receiving coil of the vehicle assembly, efficiency, power requirements, and the characteristics of the location where the transmitting coil (210) is placed.

[0062] The power supply unit (230) can convert AC power supplied by the wireless charging device into DC power and supply it to the transmitting coil (210). The power supply unit (230) may include a high-performance rectifier circuit to increase conversion efficiency. In addition, the power supply unit (230) may include a power factor correction circuit to increase power supply efficiency and reduce the impact on the power grid. In addition, the power supply unit (230) may further include a short-circuit protection circuit, an overvoltage protection circuit, and an overcurrent protection circuit.

[0063] The control unit (240) can control the power supply unit (230) by determining whether to supply power to the transmission coil (210). For example, if the control unit (240) determines that a foreign substance is present in the foreign substance detection area through the detection sensor unit (250), the control unit (240) can cut off the power supplied to the transmission coil (210).

[0064] The detection sensor unit (250) may include a sensor for determining whether a foreign substance is present in the foreign substance detection area. For example, the detection sensor unit (250) may include at least one of a sonar sensor, an M-lidar, a camera, or an S-lidar as a sensor for determining whether a foreign substance is present. The arrangement, configuration, number, etc. of each sensor are described in FIGS. 3 to 5 and are therefore omitted here.

[0065] In one embodiment, a storage unit (not shown) may be further included in the ground assembly. The storage unit may store information such as whether a foreign substance is detected and the method of controlling the power supplied to the transmitting coil based on the detection, as a log, for later verification and utilization.

[0066] FIG. 7 is a flowchart of a wireless charging control method of a ground assembly included in a wireless charging system for an electric vehicle according to one embodiment of the present invention.

[0067] Referring to FIG. 7, the control unit of the ground assembly can detect a foreign substance using a detection sensor unit (S710). For example, if the sensor of the detection sensor unit for detecting a foreign substance is a sonar sensor, the control unit can detect whether a foreign substance exists using a plurality of sonar sensors. The control unit can detect whether a foreign substance exists by transmitting sound waves through the plurality of sonar sensors simultaneously or sequentially. As another example, if the sensor of the detection sensor unit for detecting a foreign substance is an M-lidar, the control unit can rotate the M-lidar to scan. The control unit can detect whether a foreign substance exists based on the scan result. As another example, if the sensor of the detection sensor unit for detecting a foreign substance is a camera and / or an S-lidar, the control unit can detect whether a foreign substance exists using the results measured by the camera and / or the S-lidar.

[0068] In one embodiment, when a foreign substance is detected, the control unit may obtain additional information about the detected foreign substance. For example, the control unit may obtain information about the size, type, etc. of the foreign substance.

[0069] The control unit of the ground assembly can measure the distance to an external object detected using the detection sensor unit (S720). The control unit can measure the distance to the external object based on the characteristics of each sensor included in the detection sensor unit.

[0070] The control unit of the ground assembly can determine whether a foreign substance exists within the foreign substance detection area based on the measured distance (S730). The control unit can determine whether a foreign substance exists within the foreign substance detection area using the distance to the foreign substance measured using each sensor based on the position of each sensor of the detection sensor unit.

[0071] The control unit of the ground assembly can control the power supplied to the transmitting coil based on the judgment result (S740). The control unit can control the power transmitted to the transmitting coil differently depending on whether a foreign substance is present within the foreign substance detection area. Furthermore, the control unit can control the power supplied to the transmitting coil differently depending on the location of the detected foreign substance. The control unit can control the power supplied to the transmitting coil by further considering information about the detected foreign substance.

[0072] According to one embodiment, the control unit can control the power supplied to the transmitting coil by terminating the wireless charging system, stopping wireless charging, or switching to the LPE (Low Power Excitation) mode or the LF (Low Frequency) mode when it is determined that a foreign substance is present within the foreign substance detection area.

[0073] Although the present disclosure describes the ground assembly as being placed in a parking lot, it may also be applied to other locations, i.e., locations where a detection sensor unit capable of detecting foreign matter within a foreign matter detection area around the transmitting coil can be installed. For example, the ground assembly according to the present disclosure may be applied to some of the ground assemblies placed on roads. When the ground assembly is placed on a road, the ground assembly according to the present disclosure may also be applied to a dynamic wireless power transfer method.

[0074] Although the above description focuses on examples, these are merely examples and do not limit the present invention. Those skilled in the art will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present invention. For example, each component specifically shown in the examples can be modified and implemented. In addition, differences related to such modifications and applications should be construed as being included within the scope of the present invention defined in the appended claims.

Claims

1. Transmitter coil; A power supply unit capable of supplying power to the above-mentioned transmitting coil; A detection sensor unit capable of detecting an external substance within an external substance detection area around the above-mentioned transmitting coil; and A control unit is included that detects the external material using the detection sensor unit, measures the distance to the detected external material, determines whether the external material exists within the external material detection area based on the measured distance, and controls the power supplied to the transmitting coil based on the determination result. The above detection sensor unit includes at least one of a sonar sensor, a lidar, and a camera, A ground assembly for wireless charging of an electric vehicle, wherein the above-mentioned external material detection area is within a certain distance from the edge of the transmitting coil in a horizontal direction to the ground surface and within a certain distance from the upper portion of the transmitting coil in a vertical direction to the ground surface.

2. In paragraph 1, If the above detection sensor unit includes a sonar sensor, A ground assembly for wireless charging of an electric vehicle, wherein the sonar sensor is disposed on at least a portion of a side of an edge of the transmitting coil.

3. In paragraph 1, If the above detection sensor unit includes a sonar sensor, A ground assembly for wireless charging of an electric vehicle, wherein the sonar sensor is disposed on at least a portion of a side of an edge of the transmitting coil.

4. In paragraph 1, If the above detection sensor unit includes M-LiDAR (Mechanical LiDAR), The above M-lidar is a ground assembly for wireless charging of an electric vehicle, which is placed at the center upper part of the above transmitting coil.

5. In paragraph 1, If the above detection sensor unit includes a camera or S-LiDAR (Solid-State LiDAR), A ground assembly for wireless charging of an electric vehicle, wherein the camera or S-lidar is positioned on at least a portion of the side of the edge of the transmitting coil.

6. In paragraph 1, If the above detection sensor unit includes multiple cameras or S-LiDAR (Solid-State LiDAR), A ground assembly for wireless charging of an electric vehicle, wherein the plurality of cameras or S-lidars are arranged at the center upper portion of the transmitting coil.

7. In paragraph 1, A ground assembly for wireless charging of an electric vehicle, wherein the above-mentioned foreign material detection area is determined by considering at least one of the type, arrangement, thickness, and number of turns of the above-mentioned transmitting coil.

8. In paragraph 1, The above-mentioned transmitting coil is a ground assembly for wireless charging of an electric vehicle, partly or entirely protruding from the ground surface.

9. In paragraph 1, The above-mentioned transmitting coil is a ground assembly for wireless charging of an electric vehicle, which partially or completely protrudes from the ground surface when the electric vehicle is charged.

10. In paragraph 1, A ground assembly for wireless charging of an electric vehicle, wherein the control unit obtains information about the detected external substance when the external substance is detected.

11. In paragraph 1, A ground assembly for wireless charging of an electric vehicle, wherein the control unit controls power supplied to the transmitting coil by further considering information about the acquired external material.

12. In paragraph 1, A ground assembly for wireless charging of an electric vehicle, wherein the control unit differently controls the power supplied to the transmitting coil depending on the location within the external material detection area where the external material is detected.

13. In paragraph 1, A ground assembly for wireless charging of an electric vehicle, wherein the above detection sensor unit operates when charging of the electric vehicle is initiated.

14. A step of detecting an external substance using a detection sensor unit; A step of measuring the distance to an external substance detected using the above detection sensor unit; A step of determining whether a foreign substance exists within the foreign substance detection area based on the measured distance; and A step of controlling power supplied to a transmitting coil based on the above judgment result is included, The above detection sensor unit includes at least one of a sonar sensor, a lidar, and a camera, A method for controlling wireless charging of a ground assembly, wherein the above-mentioned external material detection area is within a certain distance from the edge of the transmitting coil in a horizontal direction to the ground surface and within a certain distance from the upper portion of the transmitting coil in a vertical direction to the ground surface.

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