Onboard Ev Charger Using Totem-Pole PFC and Isolated DC/DC Converter for Enhanced Power Quality

Efficient power conversion systems are essential for ensuring optimal performance in electric vehicle (EV) charging applications. Onboard EV chargers typically employ a two-stage architecture, consisting of an AC-DC converter in the initial stage and an isolated DC-DC converter in the subsequent stage for battery charging. This work proposes a single-phase onboard EV charger through the integration of a totem-pole power factor correction (PFC) converter and a forward converter. The totempole PFC converter is utilized for AC-DC conversion, while the forward converter provides DC-DC step-down regulation. To further improve power quality, a second-order generalized integrator (SOGI)-based controller is implemented, effectively reducing THD under distorted input voltage conditions. The operational principles of the proposed converter are analyzed, and simulation results are provided to validate the system's performance. The proposed converter is simulated at a 1 kW power level with an 96 V output, aligning with the Bharat AC001 standard for EV charging applications.