This talk will provide an overview of how to achieve and optimize a reduction of energy loss on electric vehicle (EV) across various driving cycles, including worldwide harmonized light-duty vehicles test procedure (WLTP), urban dynamometer driving schedule (UDDs), etc. Recently, a 3-level gate drive method has been proposed and researched, showing the benefits of using adjusting gate drive for each switching cycle based on the EV inverter operating conditions to reduce the energy loss for EV driving cycles. A further analysis on the effect of more gate drive levels for energy loss saving optimization is analyzed in this presentation. The gate drive level is up to 15 static drive strengths through paralleling four output circuits. A new method called dynamic gate drive (DGD) is utilized to further improve the energy reduction for each driving cycle while providing more benefits on dv/dt and di/dt control. The goal is to analyze the effect of more gate drive level and dynamic gate drive on the energy loss reduction, and show the strategy to select gate drive level and dynamic gate drive.
