由於功率因數及轉換效率，決定電力轉換器之品質。因此，本論文提出具高功率因數及高轉換效率之新型電力轉換器：零電壓切換(ZVS)單級高功因主動箝位順向式AC/DC電力轉換器。
吾人提出之轉換器，係應用元件移位法，將降-升壓型(buck-boost)及主動箝位順向式(active clamp forward)電力轉換器合併而成。其中，由於降-升壓型電力轉換器及主動箝位順向式電力轉換器，分別具天生功因校正能力與柔性切換特性，故不需電流回授控制器與柔切輔助電路，即可使轉換器具高功率因數，達成ZVS，大幅地降低轉換器成本。此外，由於新型轉換器，可回收漏感能量且具多象限應用變壓器B-H曲線的特性，故轉換器開關之突波電壓可被抑制，變壓器之尺寸可以減小。
論文中，吾人針對新型電力轉換器，進行動作原理分析及平均化數學模式推導，再依據電氣規格與操作條件，設計元件值。確定元件值後，可應用指導教授Lin提出之圖解法，推導新型轉換器之小信號數學模式，並依據古典控制理論，設計電壓回授控制器。最後，吾人以IsSpice模擬軟體與實作電路，驗證理論推導之正確性。
本論文實作電路之電氣規格為：輸入電壓 、切換頻率 、輸出電壓 、輸出功率 。滿載時：功因為0.986，效率可至86 %。由實作結果可知，吾人提出之新型電力轉換器，確實具有高功率因數與高轉換效率之特性。

Due to the quality of the power converter depends on the power factor and the conversion efficiency, a novel zero-voltage-switching (ZVS) single-stage active clamp forward AC/DC converter is proposed in this paper. It is verified to exhibit with both high power factor and high conversion efficiency.
The proposed converter is an integration of buck-boost and active clamp forward converter by means of the component placement. Thanks to the inherent high power factor of buck-boost converter and the soft-switching property of active clamp forward converter, the current-feedback controller and soft-switching auxiliary circuit are not necessary to achieve high power factor and ZVS. Hence, the cost of the converter is substantially reduced. In addition, since the energy stored in the transformer leakage inductance is recycling and the transformer is operating in the multi-quadrant of the B-H plane, the voltage spike at the switch can be suppressed and the size of the transformer can be thereby minimized.
In this thesis, the operating principle and the averaged mathematical model of the novel converter are presented. Then, the value of each component is well designed to satisfy the electrical specifications and ZVS operation conditions. After determining the value of each component, the graphical method proposed by Professor Lin is adopted to derive the small-signal model of the novel converter. The voltage-feedback controller can then be designed by applying the classical control theory. Finally, the theoretical analysis is verified by IsSpice simulations and the experimental results.
The experimental results reveal that when the input voltage , the switching frequency , the output voltage and the output power , the proposed converter exhibits power factor of 0.986 and efficiency of 86 % at full load. It validates the properties of high power factor and high conversion efficiency of the proposed converter.

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