Analysis of Bifurcation Phenomena Based on Optimized Transformer in Loosely Coupled Inductive Power Transfer System

In order to increase the efficiency of the loosely coupled inductive power transfer system, the leakage inductances of the loosely coupled transformer need to be compensated. But the compensated capacitors may make the system enter into multi-resonant state. Thus the transfer characteristics of the system are analyzed and simulation of the transfer function is given. From the simulated curved surface, the frequency bifurcation phenomena can be observed. Then, the theoretical analysis of the frequency bifurcation phenomena is given, and the proper choice for compensated capacitors is presented. Finally, we adopt the optimized frequency and obtain the stable output voltage using phase shift full bridge control.