本論文係以嶄新單級隔離式HPFC電力轉換器為基礎，首先回顧其設計理念，並研究由雙級式電路演化為嶄新單級式電力轉換器之始未。此外，探討當電感 與磁化電感 操作於DCM+CCM時所産生之儲能電容高電壓應力。
為了解決高電壓應力的問題，可應用磁性負回授法，在轉換器中加入第三匝線圈，而形成之嶄新單級隔離式HPFC電力轉換器。此轉換器無輸入平均電流死帶(dead-band)，若與採取磁性負回授法之單級式電力轉換器BIFRED作比較，此嶄新單級電力轉換器同時具有高功因與低電壓應力之特性。
針對本論文提出的低電壓應力之嶄新單級隔離式HPFC電力轉換器，吾人進行電路動作原理分析，再以平均化法，對開關切換週期及線電壓週期建模，求得交流小信號數學模式。吾人可應用能量轉移法及分能定律，簡易地求得 與 ，而且更清楚地瞭解各元件的能量傳遞關係。此外，應用分能定律得到的結果與平均化法的結果是一樣的。
在論文中吾人亦設計元件規格，以符合DCM+CCM之操作模式，滿足高功因/低電壓應力的要求，再以模擬軟體IsSpice確認之。最後，為了將輸出電壓穩壓，利用古典控制理論設計電壓回授控制器，實作輸出功率為 之電力轉換器，並以實作之量測結果驗證理論分析之正確性。由實測結果可知：加入控制器後並不會影響轉換器的功因校正能力，且能達到線電壓及負載變動時，輸出穩壓的要求。

A novel single-stage isolated HPFC converter operating in DCM+CCM mode is proposed in this thesis. The design is presented first, and then a two-stage HPFC converter is transformed to become a HPFC converter. In addition, the voltage stress of the bulk capacitor is investigated while inductors and are operating in DCM+CCM mode.
In order to overcome the problem of high voltage stress caused by the bulk capacitor, a negative magnetic feedback technique can be applied. It is achieved by adding a tertiary transformer so that the input current deadband is completely eliminated. This results in nice power factor. Compared with the famous BIFRED power converter, the proposed single stage isolated HPFC converter is superior with better power factor and lower voltage stress.
The detailed circuit analysis for the novel HPFC converter operating in DCM+CCM mode is also presented in the thesis. The small-signal model is then derived by the two-time-scale averaging method. Moreover by virtue of energy transfer method and energy division law, the voltages of bulk capacitor and output load can be easily obtained. The results coincide with those obtained by averaged method.
Every component of the proposed converter is well designed to ensure the operation of DCM+CCM mode as well as low voltage stress requirement. The results are verified by IsSpice simulations.
Finally, a classical controller is designed to achieve output voltage regulation despite of the line voltage and load variations. A power converter of 80 W is implemented. It is verified by experimental measurements. It also shows that power factor is independent of the added controller.

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