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Effects of operation frequency and current on coil impedance of EV wireless charging system

This paper presents an analysis of operation frequency and current effects on coil impedance and system characteristics of electric vehicle (EV) wireless charging system. Firstly, an equivalent circuit model of EV wireless charging system with dual side LCC compensation networks is established. Also, power loss and system efficiency expressions are given. Then, frequency influence is studied considering Litz wire used for the coils. Furthermore, effects of frequency and current are analyzed based on parameter measurements and tests. Finally, efficiency and output power change curves are given to show the impacts of frequency- and current-dependent coil impedances on system characteristics.