The present invention relates to wireless charging of an electric vehicle. A wireless charging system comprises two or more antennas and calculates the distance between the antenna and the electric vehicle using an RSSI value, and calculates the position of the electric vehicle obtained by a triangulation method using the position information of each antenna. According to the triangulation method, since not only the distance between ta wireless charging transmitting pad and a receiving pad of the electric vehicle, but also the relative position of the transmitting pad and the receiving pad can be accurately obtained, the improvement of the wireless charging efficiency according to the alignment of the transmitting pad and the receiving pad can be expected.
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