Optimization Design for Wireless Power Transfer System under the Variation of Load and Coupling Coefficients

摘要

The variation of load resistance and coupling coefficient are two key factors affecting the output characteristics of wireless power transfer system during the charging process. Both the variation of coupling coefficient caused by the position deviation of primary and secondary devices and the variation of load resistance during charging will result in the low output power and efficiency of the wireless charging system. In view of the above problems, this paper studied the constraint conditions of the compensation network of several wireless power transfer systems, and analyzed the output characteristics of the wireless power transfer system of each compensation network under the variation of load and coupling coefficient. The LCL-LCL type compensation network structure was selected for optimization design and according to the variation characteristics of output power and efficiency with load and coupling coefficient, the method of optimizing the compensation network parameters was proposed. The output power value of the design system was further optimized by adding a dc-dc converter circuit. Finally, the effectiveness of the proposed optimization design method was verified through the system simulation.