AC-DC-DC/AC Hybrid Converter for EV Charger

This paper presents a two-stage AC-DC-DC/AC hybrid converter designed for electric vehicle (EV) chargers with input unity power factor operation. The proposed converter features a two-stage conversion process, producing both a DC output and a three-phase AC output from a single-phase AC input via a diode bridge rectifier. In this AC-DC-DC/AC converter, the switch of the boost converter is replaced by a three-phase inverter circuit, enabling unity power factor operation at the input AC through the switch mode operation of the three-phase inverter. This hybrid converter requires fewer switches to generate DC and three-phase AC outputs simultaneously, enhancing reliability due to its inherent shoot-through protection in the inverter operation and the elimination of the DC link capacitor at the rectifier stage. The converter achieves power factor correction on the input AC side of the single-phase AC-DC diode rectifier using a continuous control set predictive control algorithm (CCS-PCA), which boosts the DC output and modulates the three-phase AC outputs. The converter’s operation is validated using an FPGA-based Typhoon HIL-402 controller in a hardware model.