Lately, the battery voltage of electric vehicle (EV) has risen, a twofold increase from the previously commercialized ones. However, adopting high-voltage battery has introduced a challenge in the usage of lowervoltage fast dc chargers. To overcome this issue, a step-up charging topology that utilizes the motor drive system has been studied. In this paper, a two-phase interleaved charging strategy is proposed. Only two phases of the motor are utilized to boost charge the battery while regulating the generated dc torque to zero. To ensure the standstill condition while charging, torque produced from the zero-sequence components is also analyzed. Finally, the proposed strategy diminishes core loss by reducing the current ripple of windings, resulting in improved energy efficiency. The feasibility of this work is theoretically assessed, and the experimental results demonstrate the efficacy of the proposed strategy.
.jpg "Junhyuk Yang photo")