A coil parameter optimization method for SS dual channel wireless charging system based on coil splitting

The wireless power transfer (WPT) system is widely used for its convenience. However, how to address the problem of misalignment is a hard problem to solve. This paper proposes a design method for an output-parallel Series-Series (SS) WPT system based on a designed splitting coil coupler. The method aims to optimize the parameters of coil structure based on the multi-island genetic algorithm. Besides, by designing splitting coils and specific parameters, the performance of misalignment tolerance of multi-channel coils is improved, and the detailed analysis is proposed as well. Finally, A 3.3kW splitting coil WPT system prototype is built. Compared to the traditional design, the proposed design can achieve a higher coupling with the same misalignment distance, as well as less power loss by the designed splitting coils.