Half-Bridge Full-Bridge AC-DC Resonant Converter for Bi-directional EV Charger

A single-stage AC-DC converter for bi-directional EV battery charger is proposed in this paper. The topology is a HB-FB resonant converter with back-to-back MOSFETs on its AC Half-Bridge. To operate with a wide range of active and reactive power and input and output voltage, a proper controller is also proposed. The controller enables the converter to operate under Zero Voltage Switching (ZVS) for all the switching instants and it minimizes the conduction loss. Operation under minimum conduction loss, improves efficiency. ZVS enables the switching frequency to increase. Therefore, smaller transformer and reactive components can be used. Analysis, control, simulation results and experimental results are presented as well as a comparison with the HB-HB topology.