A Constant Current and Constant Voltage Self‐Switching Wireless Power Transfer System Based on S‐CL‐S Compensation

ABSTRACT Traditional wireless power transfer (WPT) systems suffer from numerous drawbacks when switching between constant current (CC) and constant voltage (CV) modes, such as increasing system complexity, reducing transmission efficiency, and requiring additional detection of the battery state of charge (SOC), among other issues. To address these problems, this paper proposes a method for the automatic switching between CC and CV modes. This method eliminates the need for additional control modules, wireless communication links, and battery SOC detection, enabling automatic switching between two modes while ensuring the system operates in a zero‐phase‐angle (ZPA) state. Furthermore, the system features open‐circuit self‐protection and a high degree of design flexibility. Compared with existing solutions, the receiver side of the proposed system is more compact, making it particularly suitable for applications demanding high space utilization. To verify the feasibility and practicality of the proposed scheme, an experimental prototype with a charging current of 2 A and a charging voltage of 79 V is constructed. Experimental results validate the correctness of the theoretical analysis, and the maximum efficiency of the system reaches 95.19%.