A Phase Shedding Control Technique for Ripple Minimisation for EV Fast DC Charging Applications

This paper introduces an off-board fast DC charger for electric vehicles (EVs) with a proposed control scheme that aims to produce an output charging current with the lowest ripple possible and to improve the overall efficiency of the system. The proposed configuration of the DC charger is based on multiple modules of dc-dc multiphase interleaved buck converters (IBCs). Using phase-shedding control, the DC charger can process only a fraction of the total rated power based on the required charging power. This leads to a reduction in the losses resulting in an improvement in the overall charging system. As demonstrated by simulation results, the proposed methodology considerably minimizes the ripple of the output charging current, which directly affects the lifespan of the EV battery.