Design of Constant Voltage Compensation Topology Applied to WPT System for Electrical Vehicles

摘要

Due to the loose coupling characteristic of the wireless power transfer system, design of the compensation topology is important. In SS resonant compensation condition, using Buck circuit in secondary side, the output load current and the duty cycle showing approximate inverse relationship in a wide range, making traditional Buck circuit control method cannot be used. To solve this problem, this paper mainly introduces the design of the compensation topology which can realize the secondary side constant voltage output in the case of variable load. By using fundamental analysis method, two different resonant are analyzed. Primary side compensation structure is more suitable for electrical vehicles WPT system. The reasonable control of output power can keep the system operating at the maximum efficiency point. Finally, the above conclusions are verified by simulation.