Comparative analysis of electrolytic capacitor and thin film capacitor

Based on the present literature,the merits and short comings of the electrolytic capacitor and thin film capacitor are analyzed.Firstly,the main factors affecting the electrolytic capacitor lifetime is analyzed and the method of estimating its lifetime is presented.Secondly,in view of the various factors such as capacitance,current root mean square(RMS)value,over-voltage and load power,the DC capacitor in the AC-DC-AC power electronic convertor is designed because the thin film capacitor has an advantage over the electrolytic capacitor.Finally,a comparative design of the two kinds of large-capacity power capacitors is made by using electrolytic capacitor and thin film capacitor respectively.The results show that compared with the electrolytic capacitor,the thin film capacitor has long life time,high voltage resistibility,strong current capability,effective resistance to the reverse voltage,acid-free pollution and can be stored for a long time.Moreover,its volume is smaller.