Insight Study of Selection of Filter Electric Capacitor

In filters circuit,the formula RC≥(3～5)T/2 was used mostly in selection of filter electric capacitor in the filters.In actual circuit design,many peoples also think that the bigger filter capacity is,the better it performs.The problem was discussed insightedly.First,the necessity of the filter capacitor was discussed,And then further theoretical analyses computing were made.According to the theory computing result of the actual,compiling programm to imitate the working process of circuit was completed.Finally,the effect on the current voltage and other component parameters was discussed by illustrations.