Abstract

This paper presents a methodology to design an onboard electric vehicle (EV) charger based on a dual-bridge series resonant converter (DBSRC). The operating modes of this single-stage ac-dc converter that offer soft-switching with reduced resonant-tank rms current are investigated in detail using a phasor-based analysis. A basis to select the switching frequency and transformer turns ratio of this converter is presented with an objective to achieve a high and flat efficiency profile. Finally, a universal-input, 3.7 kW, 200 V-500 V output onboard EV charger is designed using the presented methodology and its performance is compared with a fully soft-switched impedance control network (ICN) based resonant single-stage onboard EV charger.

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