ABSTRACT Considering that different numbers of lithium batteries require different voltage levels for charging, it is crucial to design a wireless power transfer (WPT) system to achieve different outputs. This paper proposes a dual‐mode WPT charging system based on double‐side reconfiguration, which can be configured as an S‐S dual‐coil structure to achieve constant current (CC) output and two S‐S‐S three‐coil structures to achieve two constant voltage (CV) outputs. At the same time, the system achieves zero phase angle (ZPA) operation in both CC and two CV modes, ensuring high efficiency of the charging process. In addition, the overall resonance condition is satisfied by the system through the parameter design method of the three coils, without the need for special decoupling coil design, thus reducing the difficulty of system design. Firstly, the proposed WPT charging system is modeled in detail and comprehensively analyzed theoretically. Secondly, the simulation model is established by simulink and 3D‐Maxwell to verify the CC and CV output characteristics under the ZPA condition of the system. Finally, an experimental prototype with CC output of 1.5 A and CV outputs of 53 and 66 V is built to verify the feasibility of the proposed WPT system.
Yu et al. (Tue,) studied this question.