本論文旨在研製以頻率及波寬同時調變控制單級高功因升壓順向式轉換器，其特點在於有效降低系統的輸出電壓漣波，並藉由頻率調變改善開關電壓的振盪程度，以少量元件達到高效率、高功因以及低電壓漣波輸出之目的。當市電輸入整流後而無穩壓濾波的條件下，且其電壓為低電壓準位區間時，因為單調變波寬之方式其導通率須大範圍變動，導致電感電流變動較大，而無法即時控制輸出電壓。加入頻率調變方式控制初級側傳送能量的所須時間，可改善因輸入電壓準位降低時而使輸出電壓形成一低頻的電壓漣波。本文採用單級單開關高功因升壓順向式轉換器的架構，搭配脈波頻寬控制器及運算放大器修改成適合此一架構之控制方式。最後將本文所使用之調變頻率與波寬的雙調變方式與固定頻率調變波寬的單調變方式，分別應用於單級單開關升壓順向式轉換器予以量測比較，以確定輸入電流諧波成份、輸出電壓漣波及效率的確有明顯改善。

The purpose of this thesis is to design and implement the single-stage single-switch boost-forward converter with frequency modulation and pulse-width modulation composite control. This control method could be reduced the output voltage ripple. The frequency modulation could be reduced the MOSFET voltage oscillation. Therefore, the system efficiency would be reduced too. In this way, the frequency and pulse-width modulation had been controlled by feedback voltage level. When input rectified voltage was low voltage level. This control method would be improved the duty-cycle. Therefore, the output voltage ripple and input current harmonic could be reduced. This control method would be verified by compared the single modulation and dual modulation to control the single-stage single-switch high-power-factor boost-forward converter.

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