电动汽车驱动器中支撑电容体积优化研究

Research on the volume optimization of support capacitor in EV driver

在电动汽车驱动器中,支撑电容容值的降低是减小驱动器体积的有效方法。电解电容是支撑电容的常用电容器,其自身通过的纹波电流一般不能高于20 m A/u F,为了能满足这个要求,需要将电解电容串并联使用,这也就大大增加了驱动器的体积。近年来薄膜电容以其优异的性能逐渐走入人们的视野。本文先讲述了应用于电动汽车驱动器直流支撑电容中薄膜电容的参数计算,然后通过实验来验证计算公式的正确性,并且在实验过程中对相同条件下所需薄膜电容的和电解电容的容值进行对比,从而验证使用薄膜电容实现支撑电容体积优化的可行性。

In EV driver,the decrease of the capacitance for support capacitor is an effective method to reduce the volume of the driver.Electrolytic capacitor is commonly used as support capacitor and the ripple current through itself is generally not higher than 20 m A/u F.In order to meet this requirement,the electrolytic capacitor need to be connectd in series,which greatly increases the volume of EV driver.In recent years,the film capacitor has gradually entered the view of people with its excellent performance.This article first tells the parameter calculation of film capacitor used as support capacitor in EV driver,then through the experiment to verify the correctness of the calculation formula,in the same time,comparing the required capacitance of film capacitor and electrolytic capacitor on the same condition to verify the feasibility of using film capacitor to optimize the volume of support capacitor.