本論文提出一新型高升壓比直流-直流轉換器，採用耦合電感與倍壓電路技術，在不需要非常高的責任週期操作下，達到高升壓增益比。此外，本轉換器具有耦合電感之漏感能量回收功能，且切換開關上電壓應力為輸出電壓的一半，因此可選擇低額定的切換開關，其導通電阻較低，可減少電路導通損失，提高轉換器轉換效率。本論文討論連續導通模式、不連續導通模式之操作原理及穩態特性分析，並探討其邊界工作條件。最後實作一實驗室雛形電路，輸入電壓為24 V，輸出電壓為200 V，輸出功率為250 W，以驗證本轉換器之可行性能。

In this thesis, a novel high step-up DC-DC converter is presented. The coupled-inductor and voltage-doubler circuit are integrated in the proposed converter to achieve high step-up voltage gain without extremely high duty ratio. The energy stored in the leakage-inductor of the coupled-inductor can be recycled into the output and the voltage-stress on the power switches is half of the output voltage such that low voltage rating power devices are used in the proposed converter. Thus, the overall system efficiency can be improved. The operating principles and the steady-state analyses of continuous and discontinuos conduction modes are described in detail. Also, the boundary operating condition is discussed. Finally, a laboratory prototype circuit with 24 V input voltage and 200 V/250 W output is implementerd to verify the performance of the proposed converter.

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