Research on parameter optimization of Double-D coils for electric vehicle wireless charging based on magnetic circuit analysis

Abstract

Compare with circular coils, Double-D coils are widely used in the wireless charging system of electric vehicles for its high coupling coefficient and excellent offset tolerance. In order to obtain higher coupling coefficient and reduce the leakage magnetic flux in the central part of the coils, this paper proposes a method that optimizing stray parameters, which can achieve more than 95% of transmitting efficiency. The investigation is performed by joint simulation for the choice of experimental devices concerning current-withstanding characteristic. According to simulations and experiments, more than 11 kW output power can be achieved for a wide range of frequency.