本論文提出一新型高效率高升壓直流對直流轉換器，利用耦合電感與倍壓電路，使本轉換器具有架構簡單及高效率等優點，在較小的開關責任週期內可得到高升壓比。本文首先說明電路之動作原理，並分析此轉換器其耦合電感在不同匝數比下的效率及電壓轉換比，以得到較佳之系統參數。最後，研製一輸入電壓24 V，輸出電壓為200 V，輸出功率100 W之電路雛型，並由實驗結果驗證理論分析之可行性。

In this thesis, a novel high efficiency high step-up DC-DC converter is presented. The coupled-inductor and voltage-double circuit are integrated in the proposed converter. The power converter not only achieve high voltage ratio with appropriate duty cycle but also has advantages of simple structure and high efficiency like boost converter. The analysis of operating principle of this converter is performed at first. Then, the turn-ratio of the coupled-inductor is discussed for voltage ratio and the efficiency of the proposed converter. Finally, a prototype circuit with 24 V input voltage, 200 V output voltage and 100 W output power is implemented to verify the performance of the proposed converter.

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