Abstract：Due to the coil misalignment, the variation of self-inductance and mutual inductance of coils are inevitable in electric vehicles (EVs) applications based on inductive power transfer (IPT) technologies, which will eventually lead to the deviation of the system output from the desired value and the decrease of efficiency. In view of the mentioned phenomenon, a control method for constant current (CC) or constant voltage (CV) output is proposed under coil misalignments. Considering the detuning phenomenon caused by the variation of self-inductance, the resonant state can be maintained by shifting the switching frequency of the full-bridge inverter, thus zero phase angle (ZPA) and high efficiency can be realized. Then, the CC or CV output can be implemented by adjusting the phase-shift angle when the mutual-inductance varies. A 96V/2A experimental prototype is built to verify the correctness of the theoretical analysis. The maximum efficiency of the IPT system can reach 95.3%.
张亚伟, 王兴国, 朱箫. 考虑线圈偏移的无线充电系统恒流/恒压输出研究[J]. 电气技术, 2022, 23(6): 93-98.
ZHANG Yawei, WANG Xingguo, ZHU Xiao. Research on constant current/constant voltage output of wireless charging system under coil misalignments. Electrical Engineering, 2022, 23(6): 93-98.
2022, Vol. 23 
