A Full Range Soft-Switching Operated Modified DC-DC Converter for EV Applications with Low Voltage Spikes.

As the role of converter configuration is vital in the AC charging units. This paper proposes a modified leg full-bridge DC-DC converter (FBDC), which operates with customized pulse width modulation (cmPWM) gating technique for electric vehicle (EV) applications. This configuration shown can work with zero voltage switching (ZVS) turn-on and zero current switching (ZCS) turn-off with minimal conduction losses and zero switching loss in the co-occurrence of conventional FBDC. Consequently, the problem of reverse voltage and voltage spikes is addressed by including the series diodes in the lagging leg and series or blocking capacitor in series with the main transformer, respectively. The converter’s design and comprehensive theoretical analysis are presented. To validate the design and analysis of the configuration, a 1.4 kW system is made in a laboratory operating at 80 kHz frequency.