A Decoupling WPT System Based on Clamp Structure for Electric Bicycle Charging

Compared with traditional plug‐in charging systems, it is more convenient and safer to use wireless power transfer (WPT) technology to charge electric bicycles (EBs) battery packs. To meet the needs of practical applications, this study proposes a decoupling WPT system based on receiver clamping. The proposed system only needs to rely on its inherent structural characteristics to achieve automatic switching from constant current (CC) mode to constant voltage (CV) mode, without the need for communication modules or complex control techniques. In addition, the system has excellent fault tolerance for open circuit and short circuit faults, thus eliminating additional detection and protection circuits and saving hardware costs. Two sets of mutually perpendicular solenoids are used to eliminate additional cross coupling, thereby avoiding the problems of low system stability and difficult parameter design caused by unnecessary coupling. Firstly, this paper theoretically analyzes the implementation conditions for the load‐independent CC and CV output characteristics as well as the corresponding zero phase angle (ZPA) operation of the proposed system. Subsequently, the circuit parameters of the proposed system are designed, and the correctness of the proposed method is preliminarily verified through simulation. Finally, a laboratory setup with 2.2 A charging current and 52 V charging voltage is fabricated, and the experimental results have verified the effectiveness and practicality of the proposed method.