本論文提出新型疊接昇壓型轉換器架構。傳統返馳式轉換器因漏感能量無法有效被利用，採用兩組昇降壓型轉換器與返馳式轉換器相互疊接方式，能有效將漏感能量傳送至輸出之電路，可降低功率元件應力，以提高整體之效率。而電路架構的輸出端電壓疊加輸入電壓，藉以提高電壓轉換比。文中首先探討由傳統架構如何延伸至疊接架構，其次說明新型疊接昇壓型轉換器之動作原理與設計考量。最後實作一輸入直流電壓24V、直流輸出電壓48V、輸出功率144 W之新型疊接昇壓型轉換器，以實驗結果驗證理論分析。

In this thesis, a novel cascoded converter is proposed. Talking about the conventional Flyback converter, the energy of leakage inductor can not be used efficiently. Both the Buck-Boost converter and the Flyback converter are combined to make the energy of leakage inductor transfer to output load. Additionally, the stress of the power elements is reduced to enhance the whole efficiency. The transfer voltage ratio is increased by casecoding the input power supply with bulky output capacitors. First, the development procedure from traditional topology to casecoded topology is discussed. Second, the operation principles and design considerations of the proposed cascoded converter are discussed. Finally, a cascoded converter with input voltage 24V, output voltage 48V, and output power 144W is implemented. The results of this experiment are used to verify the analysis of theories.

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