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Wireless charging is also known as wireless power supply WPT(Wireless Power Transmission) is the transmission of electrical energy through a coupled electromagnetic field. For electric vehicles, wireless charging is mainly through the power supply coil arranged on the ground and the electric coil at the bottom of the vehicle, and the magnetic resonance generated between the coils replaces the traditional power lines to charge the vehicle. This charging method requires higher spacing between the supply and receiving coils. The huge demand for wireless charging technology for electric vehicles makes the research and development of related technologies quite active.