Research on 11kW Wireless Charging System for Electric Vehicle Based on LCC-SP Topology and Current Doubler

In this paper, an 11kW wireless charging system based on LCC-SP compensation topology is established, in which a rectifier control with the current doubler is adopted. The impedance characteristics of LCC-SP topology are analyzed. The equivalent impedance of the current doubler is derived by Fourier decomposition of the rectifier current, and then the compensation parameters of LCC-SP are modified according to the derived equivalent circuit. Furtherly, the closed-loop control strategy of the system is proposed by establishing the small-signal model of the current doubler. Simulation and experimental results verified the analysis and validity of the proposed system. Finally, an 11kW wireless charging prototype for electric vehicles is built, and 91.6% efficiency from dc power source to load is achieved.