Analysis and Design of Soft-Switching Single-Stage Single-Phase PFC Converter for Bidirectional Plug-in EV Charger

This article proposes a novel zero-current assisted soft-switching bidirectional single-stage single-phase isolated power factor correction (PFC) based converter for the plug-in EV charger. A new EV charger includes a current-fed full-bridge converter on the grid side that is affiliated with a full-bridge converter at the dc-side coupled via a high-frequency transformer (HFT). AC-side current can be controlled to obtain power factor correction with high THD suppression. The AC-side switches are naturally commutated and attained zero current switching (ZCS) without any external passive components. Additionally, zero current turn is accomplished for DC-side switches, making the converter assures for the EV charger with great merits. Furthermore, the converter adopts a modified control strategy and novel modulation method for promising soft-switching operation and bidirectional power flow. To ensure that the proposed EV charger is feasible, simulation results using PSIM 11.04 software and experimental results of the 1.5 kW have been formulated, showing that the high performance of PFC operation and analysis are perfectly matched.