用薄膜电容器替代铝电解电容器的分析与实践

Analysis and Practice on Substituting Film Capacitor for Aluminium Electroytic Capacitor

本文详尽的分析了多相整流的"滤波电容器"的作用,得出在这种条件下"滤波电容器"的作用不再是平滑整流输出电压,而是作为直流母线的电源旁路或DC-Link电容器,用以吸收整流器输出和负载产生的纹波电流。提出采用电容器比较小的薄膜电容器替代铝电解电容器不仅在技术上是可行的,最主要的是变频器的可靠性得到明显的提高。

In this paper,it gives an detailed analysis of the ＂smoothing capacitors＇for multiphase rectifying,gives a result that it is not for smoothing rectifying output voltage as ＂smoothing capacitors＇any more,but as the bypass capacitor before DC convertor or DC-Link capacitors for absorbing ripple current by rectifier or load.It proposes the feasibility of using more lower volume film capacitor as the substitute for aluminum electrolytic capacitor,and gives the experiment result. The results show that using more lower volume film capacitor as the substitute for aluminium electrolytic capacitor is feasible in techniques.and has a advantage on price,it is most important that the reliabilities of thansducer has been improved obviously.