本論文分為兩部分，第一部分主要介紹現今功因修正技術。從功因修正器的研究背景與動機，介紹到功因修正的原理及各式架構。接著對於現今功因修正控制技術分類為兩大種，操作於連續導通模式以及操作於邊界導通模式的控制法。並特別針對目前控制方式最簡單且較熱門的固定導通時間控制法做進一步的介紹，逐項分析此控制法的缺陷及目前文獻所提出的解決方案。
第二部分即是針對固定導通時間控制法提出改善架構。對於固定導通時間控制法總協波失真表現較差的缺陷提出「前饋可調導通時間電路」改善方案，透過此電路的前饋機制可以使功因修正器在不同輸入電壓環境下都能透過偵測前饋資訊來調整導通時間，達到總諧波失真最佳化的效果。而對於緩啟動、重新啟動電路及最小導通時間議題也同時提出了整合電路，將面積大幅縮小同時滿足各種功能需求。本系統是採用TSMC 0.35μm 混和訊號製程透過國家晶片中心進行晶片實作。結果顯示，系統在加入前饋可調導通時間電路後總諧波失真值在不同輸入電壓環境下都有明顯改善，在輸入電流波形量測上也可看出差異，功因值也皆達到0.95以上，而最高轉換效率可以達到95%。

This thesis is composed of two parts. The first part introduces modern power factor correction technology. It introduces the power factor correction from the background and motivation to the operation principles and various power stage architectures. The control technology is classified into two types: the continuous conduction mode; and the boundary conduction mode. Finally, it analysis the shortcomings of constant on-time control, which is the simplest and the most popular technique, and discusses the solution from the recent papers.
In second part of this thesis, a feedforward loop adaptive on-time (FAO) improved circuit for wide input range, low total harmonic distortion(THD) is presented. It can change the on-time with a feedforward loop in different condition to get a better THD. It also combines the soft-start, restart timer, and minimum off time issues in one circuit, which can significantly reduce the area while meeting the needs of variety of functions.
This PFC controller was implemented with the 0.35 μm Mixed-signal CMOS process. The results show that the THD has been improved after adding FAO circuit under different input voltage. The improvements can be discovered by input current waveform. For the specification of 10-80W load range, the peak efficiency of 95% is achieved, and the power factor maintained at 0.95.

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