本論文探討接枝法之原理，並應用此法將降升壓式(buck-boost)與順向式(forward)電力轉換器合併，設計出新型順向式單級HPFC電力轉換器，本文所提出之電力轉換器具有下列優點：(a)輸入端功因為1；(b)儲能電容電壓應力小；(c)輸出穩壓。

　　本論文所提出的新型順向式單級HPFC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，天生便具有功因校正能力，故無須設計功因校正控制器。針對此電力轉換器，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。由於此電力轉換器係操作於DCM+DCM模式，故具有天生功因好的特性。此外，亦無儲能電容高電壓應力的問題。

　　吾人應用平均化法推導電力轉換器之直流工作點及小訊號數學模式，以瞭解其動態特性。並量測實作電路，以驗證數學模式推導之正確性。接著，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。

　　最後，利用古典控制理論設計PI控制器，將輸出電壓加以穩壓，不受線電壓及負載變動的影響。並實作輸出功率為108 W之AC/DC電力轉換器，由實作結果可知，加入控制器後並不會影響電力轉換器的功因校正能力，且能夠達到輸出穩壓，且不受線電壓及負載變動的目標。但電力轉換器之效率只有72%，為其缺點。

　　In this thesis, the principle of the graft scheme is discussed. By means of graft scheme, the buck-boost and forward converter are combined to create a novel forward single-stage high power factor correction (HPFC) converter. The main advantages for the proposed converter are unity power factor, low voltage stress of the bulk capacitor, and the output voltage regulation.

　　The novel forward single-stage HPFC converter 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, the circuit operation principle is analyzed and the effect due to light loads on the voltage of bulk capacitor is also discussed. It inherently exhibits high power factor because the proposed converter operates in DCM+DCM mode. In addition, it is also free to suffer from high voltage stress across the bulk capacitor at light loads.

　　In order to investigate the dynamic behaviors,the averaging method is used to drive the dc operating point and the small-signal model. The experimental results are used to verify the accuracy of small-signal model by the illustration of Bode plots. Then, each component of the proposed converter is designed to satisfy the operation conditions. The operating point is verified by IsSpice software simulations.

　　Finally, based on the classical control theory, a PI controller is designed to achieve output voltage regulation despite of the line voltage and load variations. A AC/DC power converter with output power 108 W is implemented in this thesis. From the results of experiment, it reveals that the designed controller can be used, without reducing the power factor of the converter, to achieve the goal of output voltage regulation despite of the line voltage and load variations. A drawback is the efficiency of the proposed converter only about 72%.

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