Clamping Diode-Based Auxiliary Circuit for Suppression of Voltage Ringing in EV Charger

With the technological advancement in the electric vehicle (EV), EV chargers become more prominent. As the dc–dc power conditioning unit plays an important role in on-board chargers. In this article, an isolated full-bridge dc–dc converters (FBDC) with diode clamping circuit operating with modified pulsewidth modulation (MPWM) is proposed. The proposed configuration eliminates the voltage ringing at the primary and secondary end of the high frequency transformer (HFT), as well as voltage ringing across the rectifier diodes. The proposed configuration saves the overrating of the system rectifier output stage as compared to conventional FBDC. The MPWM provides zero voltage switching during full-load operation. The theoretical methodology first verified on
matlab
/Simulation, later a 500 W, 80 kHz laboratory prototype is developed for validating the results with 92.10% efficiency.