A Single-/Three-phase Compatible V2G Bidirectional On-Board Charger with Reconfigurable Structure

A single-phase and three-phase grids compatible Vehicle-to-Grid (V2G) Electric Vehicle (EV) on-board bidirectional charger is proposed. The power stage and control method are configurated according to the grid voltage condition and charge/discharge command. An adaptive power control was derived to ensure minimum circulation loss of the DC/DC stage across the output voltage range. A liquid-cooled 11kW prototype of the proposed bidirectional charger was developed and experimentally verified. It achieved 96.5% maximum power conversion efficiency and 1.5kW/L power density. The proposed on-board V2G charger enables medium-speed EV charging at both single- and three-phase grids without the need for an off-board V2G charger.