基于移相控制与模式切换的双向无线电能传输系统效率优化方法

To enhance the operational efficiency of the bidirectional wireless power transfer (BWPT) system for electric vehicles over a wide power range, this paper focuses on a dual-coupled double-sided inductor-capacitor-capacitor series and parallel connection (LCC-LCC) compensation topology and proposes a multi-variable and multi-mode combined regulation strategy for high-efficiency operation. Firstly, the high-efficiency conditions of the resonant network and the power converter are derived as the theoretical basis for the efficiency optimization method. Secondly, a time-domain model compatible with various excitation voltage schemes is developed. Based on this model, the triple-phase-shift control method is analyzed, which achieves impedance matching, critical soft switching of power devices, and optimal efficiency. Furthermore, three operation modes of the high-frequency converter, namely full-bridge, half-bridge, and mixed-bridge, are studied. Mode-switching coordination is introduced to minimize the deviation of the external phase-shift angle, reduce switching losses, and adapt to different parameters and operating conditions. Finally, the experimental platform of a BWPT system is established. The effectiveness of the proposed model, method, and strategy is verified under various operating conditions. Experimental results show that the system achieves a DC-DC conversion efficiency of 94.0%~96.4% across the power range of 5%~100%.