Intelligent Power Unit Parameters Design and the Influence Analyses

Abstract

The power unit is mainly responsible for the power converter’s function of the electric vehicle, which converts the DC power from the battery to the AC power to drive the motor. Therefore, the parasitic parameters of the power unit will directly affect the output performance of the vehicle. In this paper, the parasitic parameters of the power unit are analyzed. By using an asymmetric design, the capacitor cost and performance are balanced. Moreover, the structure of the busbar is optimized according to the reasonable theoretical analysis. The simulation comparison before and after the optimization, and the comparison results of the measurement results by the double pulse test, are given to verify the optimization. Additionally, the ESL of the busbar is reduced by 10 nH. The results will offer some references to the power unit design.

Keywords

• power unit
• simulation optimization
• surge peaks
• equivalent series inductance