Phase Shift Strategy of CPT System Based on Three-inputs Fuzzy PID Control

Contactless Power Transfer (CPT) is a well-known problem, and has received widespread attention in the generation industrial applications. CPT system is vulnerable to interference by mutual inductance change or load change in the application, which can easily lead to unstable output voltage and low efficiency. Conventional PID control is too easy to meet the CPT system, and fuzzy PID consider output voltage only so that it isn't applicable to the system on battery load. Therefore, a three-inputs fuzzy PID control is proposed to solve this problem. In this paper, we derive and present accurate models of the CPT system. A control method which combined the phase-shift strategy and the three-inputs fuzzy PID algorithm are then invented. Simulation results demonstrate that the three-inputs fuzzy PID has the advantages of fast response, small overshoot and strong anti-interference ability compared with PID and fuzzy PID.