Wireless charging device for electric vehicle, wireless charging system comprising same, and wireless charging control method therefor

Abstract

A wireless charging system for an electric vehicle, according to one embodiment of the present invention, comprises: a ground assembly arranged on the ground so as to be movable; a vehicle assembly mounted on the electric vehicle; a wireless charging device for supplying power to the vehicle assembly through the ground assembly; a marker arranged in one of the wireless charging device and the electric vehicle; and a camera arranged on the other of the wireless charging device and the electric vehicle, wherein, when the camera identifies the marker, the wireless charging device controls the alignment between the ground assembly and the vehicle assembly on the basis of the positional relationship between the camera and the marker.

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 movably disposed on the ground, a vehicle assembly mounted on the electric vehicle, a wireless charging device supplying power to the vehicle assembly through the ground assembly, a marker disposed on one of the wireless charging device and the electric vehicle, and a camera disposed on the other of the wireless charging device and the electric vehicle, wherein when the camera identifies the marker, the wireless charging device is configured to control alignment between the ground assembly and the vehicle assembly based on a positional relationship between the camera and the marker.

[0007] The marker is mounted on the wireless charging device, the camera is mounted on the electric vehicle, and when the camera identifies the marker, the wireless charging device receives alignment information including a positional relationship between the camera and the marker from the electric vehicle, and may be set to move the ground assembly in a direction parallel to the ground based on the alignment information.

[0008] The alignment information may further include at least one of a positional relationship between the ground assembly and the marker and a positional relationship between the camera and the vehicle assembly.

[0009] The marker is mounted on the electric vehicle, the camera is mounted on the wireless charging device, and when the camera identifies the marker, the wireless charging device extracts alignment information including a positional relationship between the camera and the marker, and may be set to move the ground assembly in a direction parallel to the ground based on the alignment information.

[0010] A wireless charging device for an electric vehicle according to one embodiment of the present invention includes a communication unit for communicating with the electric vehicle, a control unit for controlling a ground assembly movably disposed on the ground, and a power supply unit for supplying power to a vehicle assembly mounted on the electric vehicle through the ground assembly, wherein the control unit is configured to control alignment between the ground assembly and the vehicle assembly based on a positional relationship between a marker disposed on one of the wireless charging device and the electric vehicle and a camera disposed on the other of the wireless charging device and the electric vehicle.

[0011] The communication unit may receive alignment information including a positional relationship between the camera and the marker from the electric vehicle, and the control unit may be set to move the ground assembly in a direction parallel to the ground based on the alignment information.

[0012] The control unit may be configured to extract alignment information including a positional relationship between the camera and the marker, and to move the ground assembly in a direction parallel to the ground based on the alignment information.

[0013] According to one embodiment of the present invention, a method for aligning a ground assembly and a vehicle assembly by a wireless charging device for wireless charging of an electric vehicle includes, when a vehicle assembly mounted on an electric vehicle approaches a ground assembly that is movably placed on the ground, a step of the wireless charging device performing communication setup with the electric vehicle, a step of obtaining alignment information including a positional relationship between a marker placed on one of the wireless charging device and the electric vehicle and a camera placed on the other of the wireless charging device and the electric vehicle, and a step of controlling alignment between the ground assembly and the vehicle assembly based on the alignment information.

[0014] The controlling step may include moving the ground assembly in a direction parallel to the ground based on the alignment information.

[0015] The alignment information may further include at least one of a positional relationship between the marker and the ground assembly and a positional relationship between the camera and the vehicle assembly.

[0016] The alignment information may further include at least one of a positional relationship between the camera and the ground assembly and a positional relationship between the marker and the vehicle assembly.

[0017] 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.

[0018] FIG. 1 is a block diagram showing a charging system for an electric vehicle according to one embodiment of the present invention.

[0019] FIG. 2 is a block diagram of a wireless charging system for an electric vehicle according to one embodiment of the present invention.

[0020] FIG. 3 is a schematic diagram of a wireless charging system according to one embodiment of the present invention.

[0021] FIG. 4 is a block diagram of a wireless charging device included in a wireless charging system according to one embodiment of the present invention.

[0022] 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.

[0023] FIG. 6 is a flowchart illustrating a wireless charging method of a wireless charging system according to one embodiment of the present invention.

[0024] Figure 7 is an example of the positional relationship between a marker and a camera.

[0025] Figure 8 is an example of a moving member that moves the ground assembly.

[0026] FIG. 9 is a wireless charging system that supports alignment between a ground assembly and a vehicle assembly according to another embodiment of the present invention.

[0027] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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).

[0042] 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.

[0043] 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).

[0044] FIG. 3 is a schematic diagram of a wireless charging system according to one embodiment of the present invention, FIG. 4 is a block diagram of a wireless charging device included in a wireless charging system 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.

[0045] Referring to FIG. 3, the wireless charging system (20) includes a wireless charging device (100), a ground assembly (200), a vehicle assembly (300), a marker (400), and a camera (500).

[0046] The wireless charging device (100) controls the ground assembly (200) and supplies power to the vehicle assembly (300) through the ground assembly (200).

[0047] 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.

[0048] The vehicle assembly (300) is mounted on an electric vehicle (10), includes a receiving coil, and may further include a control circuit for controlling 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 for controlling the receiving coil may be connected to the EVCC and controlled by the EVCC.

[0049] Meanwhile, the marker (400) is placed on one of the wireless charging device (100) and the electric vehicle (10), and the camera (500) is placed on the other of the wireless charging device (100) and the electric vehicle (10). In the present embodiment, the marker (400) may be placed on the wireless charging device (100), and the camera (500) may be placed on the electric vehicle (10).

[0050] According to an embodiment of the present invention, when the camera (500) identifies the marker (400), the wireless charging device (100) is set to control the alignment between the ground assembly (200) and the vehicle assembly (300) based on the positional relationship between the camera (500) and the marker (400). Here, the marker (400) may be an AR marker.

[0051] 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 a ground assembly (200) that is movably placed on the ground. 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) is set to control the alignment between the ground assembly (200) and the vehicle assembly (300) based on the positional relationship between the marker (400) and the camera (500).

[0052] Referring to FIG. 5, when a vehicle assembly (300) mounted on an electric vehicle (10) approaches a ground assembly (200) placed on the ground so as to be movable, the communication unit (110) of the wireless charging device (100) establishes a connection with the electric vehicle (10) or the EVCC mounted on the electric vehicle (10) (S500). When an electric vehicle (10) equipped with a vehicle assembly (300) enters a parking area or is parked, the vehicle assembly (300) may be determined to be close to the ground assembly (200), and thus a connection may be established. Here, the parking area refers to an area where one electric vehicle (10) can be parked, generally has a rectangular shape, and can be distinguished from other parking areas by a border line.

[0053] When establishing a connection, the communication unit (110) of the wireless charging device (100) can receive vehicle information from the electric vehicle (10) or the EVCC mounted on the electric vehicle (10). Here, the vehicle information can include at least one of vehicle type information of the electric vehicle, location information of the vehicle assembly mounted on the electric vehicle, type information of the vehicle assembly mounted on the electric vehicle, and size information of the vehicle assembly mounted on the electric vehicle.

[0054] After the connection is established, the control unit (120) of the wireless charging device (100) obtains alignment information including the positional relationship between the marker (400) placed on the wireless charging device (100) and the camera (500) placed on the electric vehicle (10) (S510). To this end, the camera (500) placed on the electric vehicle (10) photographs the marker (400) placed on the wireless charging device (100). The electric vehicle (10) or the EVCC mounted on the electric vehicle (10) extracts the positional relationship between the marker (400) placed on the wireless charging device (100) and the camera (500) placed on the electric vehicle (10) based on the photographing result of the camera (500), and transmits the extracted positional relationship to the communication unit (110) of the wireless charging device (100). In an embodiment of the present invention, the alignment information may further include a positional relationship between the ground assembly (200) and the marker (400) and a positional relationship between the vehicle assembly (300) and the camera (500). To this end, the electric vehicle (10) or the EVCC mounted on the electric vehicle (10) may further transmit the positional relationship between the camera (500) mounted on the electric vehicle (10) and the vehicle assembly (300) to the communication unit (110) of the wireless charging device (100). The storage unit (not shown) of the wireless charging device (100) may store in advance the positional relationship between the ground assembly (200) and the marker (400).

[0055] Next, the control unit (120) of the wireless charging device (100) controls the alignment between the ground assembly (200) and the vehicle assembly (300) based on the vehicle information and alignment information (S520). For example, the control unit (120) of the wireless charging device (100) extracts the movement distance of the ground assembly (200) for optimal alignment between the ground assembly (200) and the vehicle assembly (300) by using the positional relationship between the marker (400) placed on the wireless charging device (100) and the camera (500) placed on the electric vehicle (10), the positional relationship between the ground assembly (200) and the marker (400), and the positional relationship between the vehicle assembly (300) and the camera (500), and moves the ground assembly (200) according to the extracted movement distance. Here, the optimal alignment between the ground assembly (200) and the vehicle assembly (300) may mean a state in which the overlapping area between the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300) is maximized. Alternatively, the optimal alignment between the ground assembly (200) and the vehicle assembly (300) may mean a state in which the centers of the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300) overlap.

[0056] According to this, the ground assembly (200) and the vehicle assembly (300) can be finely aligned to a few centimeters, so that the wireless charging efficiency can be increased.

[0057] FIG. 6 is a flowchart illustrating a wireless charging method of a wireless charging system according to one embodiment of the present invention.

[0058] Referring to FIG. 6, when an electric vehicle (10) approaches a wireless charging device (100), the electric vehicle (10) and the wireless charging device (100) establish a connection (S600). When an electric vehicle (10) equipped with a vehicle assembly (300) enters a parking area, the electric vehicle (10) is determined to be in proximity to the wireless charging device (100), and thus, a connection can be established.

[0059] Thereafter, the camera (500) mounted on the electric vehicle (10) first detects the marker (400) mounted on the wireless charging device (100) (S610). Here, the first detection may mean that the camera (500) has recognized the presence of the marker (400).

[0060] When the camera (500) detects the marker (400) for the first time, the camera (500) notifies the ECU of the electric vehicle (10) or the EVCC mounted on the electric vehicle (10) that the marker (400) has been detected for the first time, and the electric vehicle (10) and the wireless charging device (100) exchange vehicle information and charging information with each other (S620). Here, the vehicle information may include vehicle model information of the electric vehicle (10), vehicle assembly information mounted on the electric vehicle (10), battery information of the electric vehicle (10), standard information supported by the EVCC mounted on the electric vehicle (10), etc. Here, the vehicle assembly information may include size information, position information, center information, etc. of the receiving coil included in the vehicle assembly (300). In addition, the battery information may include remaining battery information. The charging information may include standard information supported by the wireless charging device (100), ground assembly information mounted on the wireless charging device (100), chargeability information of the wireless charging device (100), etc. Here, the ground assembly information may include size information, location information, center information, etc. of the transmitting coil included in the ground assembly (200). Here, the electric vehicle (10) may transmit vehicle information to the wireless charging device (100), and the wireless charging device (100) may transmit charging information to the electric vehicle (10).

[0061] Thereafter, when the electric vehicle (10) is parked in the parking area (S630), the camera (500) mounted on the electric vehicle (10) performs a second detection of the marker (400) mounted on the wireless charging device (100) (S640), the ECU of the electric vehicle (10) or the EVCC mounted on the electric vehicle (10) transmits the second detection result to the communication unit (110) of the wireless charging device (100) (S650), and the control unit (120) of the wireless charging device (100) obtains alignment information between the ground assembly (200) and the vehicle assembly (300) based on the second detection result (S660). Here, the alignment information between the ground assembly (200) and the vehicle assembly (300) may include the positional relationship between the marker (400) disposed on the wireless charging device (100) and the camera (500) disposed on the electric vehicle (10). The positional relationship between the marker (400) and the camera (500) may include the distance between the marker (400) and the camera (500) and the direction of the marker (400) with respect to the camera (500). For example, as illustrated in FIG. 7, the distance between the marker (400) and the camera (500) may refer to the shortest distance (d) between the front center of the marker (400) and the front center of the camera (500), and the direction of the marker (400) with respect to the camera (500) may refer to the angle (θ) of the marker (400) with respect to the optical axis direction of the camera (500). Alternatively, the positional relationship between the marker (400) and the camera (500) may be represented by coordinate information using the position of the camera (500) as a reference point.

[0062] In addition, the alignment information between the ground assembly (200) and the vehicle assembly (300) may further include the positional relationship between the ground assembly (200) and the marker (400) and the positional relationship between the vehicle assembly (300) and the camera (500). Here, the positional relationship between the ground assembly (200) and the marker (400) may be expressed as the distance and direction between the ground assembly (200) and the marker (400). In addition, the positional relationship between the vehicle assembly (300) and the camera (500) may be expressed as the distance and direction between the vehicle assembly (300) and the camera (500). To this end, the electric vehicle (10) or the EVCC mounted on the electric vehicle (10) may further transmit the positional relationship between the camera (500) mounted on the electric vehicle (10) and the vehicle assembly (300) to the control unit (120) of the wireless charging device (100). The storage unit (not shown) of the wireless charging device (100) can store in advance the positional relationship between the ground assembly (200) and the marker (400).

[0063] The control unit (120) of the wireless charging device (100) calculates the movement distance of the ground assembly (200) based on the alignment information acquired in step S660, and moves the ground assembly (200) according to the calculated movement distance (S670). At this time, the ground assembly (200) can move in a direction parallel to the ground.

[0064] To this end, as illustrated in FIG. 8, the ground assembly (200) may be mounted on a movable member (800). Here, the movable member (800) may be movable in the X-axis direction parallel to the ground, in the Y-axis direction parallel to the ground and perpendicular to the X-axis, or in the X-axis and Y-axis directions. According to an embodiment of the present invention, the control unit (120) of the wireless charging device (100) may control the movement distance of the movable member (800) on which the ground assembly (200) is mounted based on the alignment information acquired in step S660.

[0065] Accordingly, when alignment between the ground assembly (200) and the vehicle assembly (300) is completed, charging begins (S680).

[0066] In this way, when moving the ground assembly (200), the ground assembly (200) and the vehicle assembly (300) can be aligned with a higher precision, for example, a precision of several centimeters, compared to driving an electric vehicle (10).

[0067] Meanwhile, the control unit (120) of the wireless charging device (100) periodically monitors an abnormal condition during charging, and when an abnormal condition occurs, steps S640 and below can be repeated. Here, the abnormal condition may be a rise in temperature around the ground assembly (200) or a decrease in charging efficiency, and may be determined by a decrease in 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 alignment between the ground assembly (200) and the vehicle assembly (300) is misaligned, the temperature around the ground assembly (200) may rise, or the charging efficiency may decrease, so that the coupling coefficient between the transmitting coil of the ground assembly (200) and the receiving coil of the vehicle assembly (300) may become lower than a reference value. Accordingly, the control unit (120) of the wireless charging device (100) may periodically monitor the coupling coefficient between the transmitting coil and the receiving coil during charging to realign the ground assembly (200) and the vehicle assembly (300).

[0068] In the above, the example in which a marker (400) is mounted on a wireless charging device (100) and a camera (500) is mounted on an electric vehicle (10) has been described, but the embodiments of the present invention are not limited thereto. A camera may be mounted on a wireless charging device (100) and a marker may be mounted on an electric vehicle (10).

[0069] FIG. 9 is a wireless charging system that supports alignment between a ground assembly and a vehicle assembly according to another embodiment of the present invention.

[0070] Referring to FIG. 9, the wireless charging system (20) includes a wireless charging device (100), a ground assembly (200), a vehicle assembly (300), a marker (400), and a camera (500).

[0071] The wireless charging device (100) controls the ground assembly (200) and supplies power to the vehicle assembly (300) through the ground assembly (200).

[0072] The ground assembly (200) is movably placed on the ground and includes a transmitting coil connected to a wireless charging device (100).

[0073] The vehicle assembly (300) is mounted on an electric vehicle (10) and includes a receiving coil. Although not shown, an electric vehicle communication controller (EVCC) is mounted on the electric vehicle (10), and the receiving coil of the vehicle assembly (300) is connected to the EVCC and can be controlled by the EVCC.

[0074] A marker (400) is placed on an electric vehicle (10), and a camera (500) is placed on a wireless charging device (100). Here, the marker (400) may be an AR marker, but is not limited thereto, and may be a license plate of the electric vehicle (10).

[0075] According to an embodiment of the present invention, when the camera (500) identifies the marker (400), the wireless charging device (100) is set to control the alignment between the ground assembly (200) and the vehicle assembly (300) based on the positional relationship between the camera (500) and the marker (400).

[0076] More specifically, when a vehicle assembly (300) mounted on an electric vehicle (10) approaches a ground assembly (200) placed on the ground so as to be movable, the communication unit (110) of the wireless charging device (100) establishes a connection with the electric vehicle (10) or the EVCC mounted on the electric vehicle (10). When establishing a connection, the communication unit (110) of the wireless charging device (100) can receive vehicle information from the electric vehicle (10) or the EVCC mounted on the electric vehicle (10). Here, the vehicle information may include at least one of vehicle model information of the electric vehicle, location information of the vehicle assembly mounted on the electric vehicle, type information of the vehicle assembly mounted on the electric vehicle, and size information of the vehicle assembly mounted on the electric vehicle.

[0077] After the connection is established, the control unit (120) of the wireless charging device (100) obtains alignment information including the positional relationship between the camera (500) disposed in the wireless charging device (100) and the marker (400) disposed in the electric vehicle (10). To this end, the camera (500) disposed in the wireless charging device (100) photographs the marker (400) disposed in the electric vehicle (10) and extracts the positional relationship between the marker (400) and the camera (500). In an embodiment of the present invention, the alignment information may further include the positional relationship between the ground assembly (200) and the camera (500) and the positional relationship between the vehicle assembly (300) and the marker (400). To this end, the electric vehicle (10) or the EVCC mounted in the electric vehicle (10) may further transmit the positional relationship between the marker (400) mounted in the electric vehicle (10) and the vehicle assembly (300) to the control unit (120) of the wireless charging device (100). The storage unit (not shown) of the wireless charging device (100) can store in advance the positional relationship between the ground assembly (200) and the camera (500).

[0078] Next, the control unit (120) of the wireless charging device (100) controls the alignment between the ground assembly (200) and the vehicle assembly (300) based on the alignment information. For example, the control unit (120) of the wireless charging device (100) extracts the movement distance of the ground assembly (200) by using the positional relationship between the marker (400) and the camera (500), the positional relationship between the ground assembly (200) and the camera (500), and the positional relationship between the vehicle assembly (300) and the marker (400), and can move the ground assembly (200) according to the extracted movement distance.

[0079] According to this, the ground assembly (200) and the vehicle assembly (300) can be finely aligned to a few centimeters, so that the wireless charging efficiency can be increased.

[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, A ground assembly placed on the ground so that it can be moved; A vehicle assembly mounted on the above electric vehicle, A wireless charging device that supplies power to the vehicle assembly through the ground assembly; A marker placed on one of the wireless charging devices and the electric vehicle, and comprising a camera disposed on another of the wireless charging device and the electric vehicle; A wireless charging system wherein when the camera identifies the marker, the wireless charging device is set to control alignment between the ground assembly and the vehicle assembly based on the positional relationship between the camera and the marker.

2. In paragraph 1, The marker is mounted on the wireless charging device, and the camera is mounted on the electric vehicle. A wireless charging system wherein when the camera identifies the marker, the wireless charging device receives alignment information including a positional relationship between the camera and the marker from the electric vehicle, and is set to move the ground assembly in a direction parallel to the ground based on the alignment information.

3. In paragraph 2, A wireless charging system wherein the alignment information further includes at least one of a positional relationship between the ground assembly and the marker and a positional relationship between the camera and the vehicle assembly.

4. In paragraph 1, The marker is mounted on the electric vehicle, and the camera is mounted on the wireless charging device. A wireless charging system in which, when the camera identifies the marker, the wireless charging device extracts alignment information including a positional relationship between the camera and the marker, and moves the ground assembly in a direction parallel to the ground based on the alignment information.

5. In a wireless charging device for an electric vehicle, A communication unit that communicates with the above electric vehicle, A control unit that controls a ground assembly placed on the ground so that it can move, and Includes a power supply unit that supplies power to a vehicle assembly mounted on the electric vehicle through the ground assembly, A wireless charging device, wherein the control unit is configured to control alignment between the ground assembly and the vehicle assembly based on a positional relationship between a marker disposed on one of the wireless charging device and the electric vehicle and a camera disposed on the other of the wireless charging device and the electric vehicle.

6. In paragraph 5, The communication unit receives alignment information including the positional relationship between the camera and the marker from the electric vehicle, A wireless charging device wherein the control unit is set to move the ground assembly in a direction parallel to the ground based on the alignment information.

7. In paragraph 5, A wireless charging device in which the control unit extracts alignment information including a positional relationship between the camera and the marker, and is set to move the ground assembly in a direction parallel to the ground based on the alignment information.

8. In a wireless charging device for wireless charging of an electric vehicle, a method for aligning a ground assembly and a vehicle assembly, When a vehicle assembly mounted on an electric vehicle approaches a ground assembly placed on the ground so as to be movable, a wireless charging device performs a step of establishing communication with the electric vehicle; A step of obtaining alignment information including a positional relationship between a marker placed on one of the wireless charging device and the electric vehicle and a camera placed on another of the wireless charging device and the electric vehicle, and A step of controlling alignment between the ground assembly and the vehicle assembly based on the alignment information. A sorting method that includes .

9. In paragraph 8, An alignment method wherein the controlling step includes a step of moving the ground assembly in a direction parallel to the ground based on the alignment information.

10. In paragraph 8, An alignment method wherein the alignment information further includes at least one of a positional relationship between the marker and the ground assembly and a positional relationship between the camera and the vehicle assembly.

Images