本論文旨在研製一新型主動箝位順向式轉換器，此架構可以解決二次側飛輪二極體電壓突波問題，減少二次側元件電壓應力及切換損失；且可降低一次側開關元件截止時開關電流，降低截止時切換損耗。此外，一次側使用主動箝位能夠使開關元件實現零電壓導通，進而切換損耗、提高轉換效率。本論文詳細分析電路架構之工作原理，並依據設計準則實作一台480 W實驗電路，其最高效率可達到94.88%。

This thesis presents the study and implementation of a novel active clamp forward converter to solve the voltage spike problem on the freewheel diode at secondary side. The voltage stress and the switching loss of the secondary component can thus be reduced. At the same time, the primary-side switch can be turned off at decreased drain current to lower the switching loss. Moreover, by adopting the active clamp circuit, the primary-side switch can achieve zero-voltage turn-on to reduce the switching loss and raise the conversion efficiency. The operating principles are analyzed in detail. Finally, a 480-W prototype of the proposed active clamp forward converter has been built according to the design procedures. The peak efficiency can be up to 94.88%.

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