XU Chen ting, WU Xin ke

(College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract: Aiming at the design of the auxiliary charger DC DC converter in electric vehicles(EVs), EV Electrical system structure and the application requirements of DC DC converter was analyzed. And based on the requirements, a Phase shift Full bridge DC DC converter was designed ,which achieves wide ZVS range and eliminates the voltage oscillation by introducing a resonant inductance and two clamping diodes in the primary side. Synchronous rectification was adopted in the secondary side for a higher efficiency. The design procedure of the key parameters and the control method of the converter were introduced. A prototype was built to verify the theoretical analysis. The results indicate that the prototype can output 160A current and achieve above 96% efficiency at light load.

Key words: automotive charger; DC DC converter; Phase shift Full bridge