本論文針對單級返馳式功因修正電路，提出降低輸出電壓漣波的
改良型電路架構。為了減少輸出電壓受電源週期性影響，改良型電路
架構中在返馳變壓器增加一繞組和輔助儲能電容，在電源低電壓處，
提供較大之輸出功率。此舉會改變轉換器在一個電源週期中電流的導
通角度，達到降低輸出電壓漣波及功因修正的折衷效果。
本文將詳細分析轉換器中新增的輔助儲能繞組如何改變輔助儲
能電容上的電壓，進而改變輸入電流導通相角及功率因數，並推導相
關電路方程式，作為電路參數設計之依據。本文將轉換器工作在電流
臨界導通模式，依電路參數設計流程，製作一輸出24 V、48 W 之雛
型電路，透過電腦模擬與實際電路量測，驗證理論分析的結果。

An auxiliary winding with an associated capacitor is added on the
single-stage power factor corrector (PFC) based on fly-back conversion to
reduce the ripple on the dc output voltage. The associated capacitor takes
out partial energy at every switching cycle from the fly-back conversion
and releases the stored energy to the load at the valley of the rectified line
voltage. The negative effect of such an approach is that the converter does
not draw a current from the AC line at the lower voltage near zero
crossing, leading to deterioration in the power factor.
This thesis analyzes how an auxiliary winding affects the voltage of
the associated capacitor, which in turn changes the cut-in angle of the
input current and thus the power factor of the AC source. To facilitate the
implementation, the fly-back converter is operated at the boundary
conduction mode (BCM). A design example is given for the 24 V, 48 W
load, based on the derived equations. The laboratory circuit is built and
tested to verify the computer simulations and analytical predictions. The
experimental results confirm the circuit analyses on the converter
performances.

中文摘要 I
英文摘要 II
目錄 III
圖表目錄 V
第一章 簡介 1
1-1 研究動機 1
1-2 論文大綱 3
第二章 返馳式功因修正電路 4
2-1 雙級高功因交流對直流轉換器 4
2-2 單級高功因交流對直流返馳式轉換器 6
2-3 諧波規範 8
第三章 單級低漣波返馳式功因修正電路 10
3-1 電路架構 10
3-2 工作原理 11
3-3 電路分析 15
3-3-1 功率因數 15
3-3-2 輔助儲能電容電壓 22
3-3-3 低頻輸出電壓漣波 26
第四章 電路設計與實驗結果 30
4-1 參數設計 30
4-2 電腦模擬 33
4-3 實驗結果 36
第五章 結論與未來研究方向 49
5-1 結論. 49
5-2 未來研究方向 50
參考文獻 51

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