A Novel High-Power Density and Low Conduction Loss Bidirectional AC/DC Charging Pile Scheme With Hybrid Charge/Discharge Control Strategy

Contrasting traditional two-stage chargers, single-stage chargers have great commercial value and development potential in the contemporary electric vehicle industry, due to their high-power density benefits. Nevertheless, they are accompanied by several challenges, including an excessive quantity of switches, significant conduction loss, and a singular objective charge-discharge control strategy. In response to these challenges, this study explores a charging pile scheme characterized by high power density and minimal conduction loss, predicated on a single-stage ac/dc matrix dual active bridge (M-DAB) converter. The optimal modulation strategy for mitigating conduction loss is analyzed, and a hybrid charge-discharge control strategy encompassing six control objectives is proposed. To authenticate the effectiveness of the scheme, an experimental prototype is constructed. A comparative analysis of data from recent charging pile research substantiates that the scheme investigated in this study exhibits promising application prospects and market potential.