用薄膜電容器替代鋁電解電容器的分析與實踐

摘要：本文詳盡的分析了多相整流的“濾波電容器”的作用，得出在這種條件下“濾波電容器”的作用不再是平滑整流輸出電壓，而是作為直流母線的電源旁路或DC-Link電容器，用以吸收整流器輸出和負載產生的紋波電流。提出采用電容器比較小的薄膜電容器替代鋁電解電容器不僅在技術上是可行的，最主要的是變頻器的可靠性得到明顯的提高。 敘詞：鋁電解電容器 薄膜電容器 紋波電流 變頻器 Abstract：In this paper,it gives an detailed analysis of the smoothing capacitorsfor multiphase rectifying,gives a result that it is not for smoothing rectifying output voltage as smoothing capacitorsany 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. Keyword：Aluminum Electroytic Capacitors, film capacitor, ripple current, transducer