傳統使用二極體與電容整流濾波得到直流鏈電壓之電子設備，其輸入電源之電流含有大量電流諧波，導致功率因數降低、線電壓失真與雜訊干擾等問題。為提昇功率因數與降低電流諧波，一般均於橋式整流器後加入功因修正電路，並經由後級穩壓器降壓與穩壓，提供負載較穩定的直流電源。屬被動式功因修正電路之填谷濾波器，其直流鏈電壓漣波較大，造成後級穩壓器之輸出含有低頻電壓漣波，為減少低頻電壓漣波，本文應用變頻控制於後級返馳式轉換器，可降低輸出低頻電壓漣波，且輸入電流諧波量可符合IEC 1000-3-2 Class A之規範。

The conventional diode-capacitor rectifier is used in front end of electronic equipment to provide the dc bus voltage source. The input current contains high current harmonics and causes several problems such as low power factor, voltage distortion, and electromagnetic interference. The valley-fill filter functions as a passive power factor corrector but large ripple voltage will be presented in the dc bus. Usually, a postregulator is used to supply a regulated dc source for the load, but large low-frequency voltage ripple still exist in the load. This thesis proposes a valley-fill filter variable frequency controlled flyback converter to reduce the low-frequency ripple. Theoretical analysis and experimental results show that the low-frequency ripple can be suppressed within ±0.3% and input current harmonics can meet with IEC 1000-3-2 Class A requirement.

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