本論文主旨在於設計與研製新型高效率高升壓比直流對直流轉換器，藉由結合耦合電感及電壓提升的技術，本轉換器亦具有架構簡單及高效率等優點，使開關責任週期操控於0.5至0.7範圍內即可得到8倍以上之升壓比，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200 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 high efficiency high step-up DC-DC converter has been proposed and implemented. This converter can achieve high voltage ratio with appropriate duty cycle about 0.5 to 0.7 by using the coupled-inductor and voltage lift technology. Also, this converter has the advantage 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 200 W output power is implemented to verify the performance of the proposed converter.

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