Research and Improvement of Oscillation Problems Caused by Active Rectifier Circuits in EV-WPT Systems

In the secondary side of the wireless power transfer system, the active rectifier helps increase efficiency and adjust output characteristics. However, there is a certain probability that oscillation problems will occur, especially in an
LCC-LCC
system. A closed loop that causes oscillations in the circuit is figured out. And with the established discrete system mode, the dynamic oscillation conditions are presented in a wide operating range. The theory and simulation show that the proposed improved control method based on the resonant filter breaks the original oscillation closed loop and effectively suppresses oscillations. Finally, the proposed method is applied in an experimental prototype, and the stable operating range of the improved prototype is significantly expanded.