摘要

　　本論文探討元件移位法之原理，並應用此法將降-升壓式(buck-boost)與混橋型順向式(hybrid-bridge forward)電力轉換器合併，設計出嶄新單級HPFC混橋型順向式電力轉換器。本論文提出之電力轉換器具有下列優點：(1)輸入端功因良好、(2)儲能電容電壓應力小、(3)輸出穩壓。
　　論文中的嶄新單級HPFC混橋型順向式電力轉換器，當前級的降-升壓式電力轉換器操作於DCM模式時，天生就具有功因校正能力，故無須設計功因校正控制器。當電力轉換器操作於DCM+CCM或DCM+DCM模式，吾人先作電路動作原理分析，並探討當負載變為輕載時，對於儲能電容電壓之影響。本電力轉換器操作於DCM+DCM模式時，不但天生具有高功因的特性，同時可以避免儲能電容高電壓應力的問題，此為本電力轉換器操作於DCM+DCM模式之主要原因。
　　確定電力轉換器之操作模式後，吾人使用平均化法推導電力轉換器之直流工作點及小信號數學模式，以瞭解其動態特性。根據轉換器之操作條件設計電力轉換器之元件規格，並應用IsSpice模擬軟體驗證直流工作點之正確性。並使用頻譜分析儀(R9211)，量測實作電路的轉移函數，以驗證數學模式推導之正確性。
　　最後，利用古典控制理論設計PI控制器及次迴路回授(minor-loop feedback)控制器，將輸出電壓加以穩壓，而不受線電壓及負載變動的影響。實作輸出功率為100 W之AC/DC電力轉換器，由實作結果顯示，兩種控制器均不會影響電力轉換器的功因校正能力，並能夠達到輸出穩壓，降低線電壓及負載變動的影響，但次迴路回授控制器優於PI控制器。

Abstract

　　In this thesis, the principle of the component placement is discussed. By means of component placement, the buck-boost and hybrid-bridge forward converter are combined to create a novel single-stage high power factor correction (HPFC) hybrid-bridge forward converter. The main advantages for the proposed converter are high power factor, low voltage stress of the bulk capacitor, and the output voltage regulation.
　　The novel single-stage hybrid-bridge forward converter with HPFC proposed in this thesis has inherent gift of power factor correction (PFC), when the first stage operates in DCM mode. Hence the PFC controller is not necessary. For the proposed converter operating in DCM+CCM or DCM+DCM mode, the circuit operation principle is analyzed and the effect influenced by light loads on the voltage of bulk capacitor is also discussed. It is revealed that when the proposed converter is operating in the discontinuous conduction mode, it not only has high power factor inherently, but also avoids to suffer from high voltage stress across the bulk capacitor at light loads. That is the main reason for the proposed converter operating in DCM+DCM mode.
　　After deciding the operating mode of the converter, in order to investigate the dynamic behaviors, the averaging method is used to drive the DC operating point and the small-signal model. Each component of the proposed converter is designed to satisfy the operation conditions. The operating point is verified by IsSpice software simulations. Then, the experimental results, which are measured by FFT servo analyzer R9211, are used to verify the accuracy of small-signal model by the illustration of Bode plots.
　　Finally, the PI controller and the minor-loop feedback controller, based on the classical control theory, are designed to achieve output voltage regulation despite of the line voltage and load variations. A AC/DC power converter with output power 100 W is implemented in this thesis.The experimental results show that both controllers can keep the inheremt ability of PFC the converter and tightly regulate the output voltage despite variations in line voltage and load resistance. However the minor-loop feedback controller is superior to the PI controller.

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