Inventor Open Circuit Fault Diagnosis Method for Dynamic Wireless Charging System Based on Post-fault Reconstruction of Driving Signal

The dynamic wireless charging (DWC) system working under high-frequency and high-current conditions is prone to inverter open-circuit faults. The existing inverter opencircuit fault diagnosis methods are mostly aimed at the motor and power system, and it is difficult or not applicable to the analysis and diagnosis of DWC system with resonant topology. In this paper, a fault diagnosis method of inverter power switch based on post-fault reconstruction of drive signal is proposed. By changing the drive signal of inverter after fault and observing the current of three-phase transmitting guide rail, the specific position of fault power switch is determined. The diagnosis method is simple and not affected by system parameter deviation and detection error. The diagnosis result is accurate and reliable. The characteristics of DWC system are fully utilized, and the hardware cost is not increased. In addition, the theoretical analysis and simulation verification of the method are carried out in this paper. The simulation results verify the correctness and effectiveness of the method.