本論文提出一新型高轉換比雙向DC-DC轉換器，電路架構使用耦合電感技術，具有高電壓轉換比之功能。此雙向轉換器操作於升壓模式時，其架構為升壓型轉換器與具倍壓電路之返馳式轉換器疊接，故具有高電壓轉換比。此外，於升壓模式時轉換器具有電壓箝位電路，可降低開關上之電壓應力並回收漏感能量傳送至輸出。當電路操作於降壓模式時，電路為非對稱半橋返馳式轉換器與降壓型轉換器經耦合電感組合而成，漏感能量藉由箝位電路回收，且各開關可達到零電壓導通，降低開關上之切換損失。本文首先針對所提出之轉換器電路，分析其動作原理與穩態特性，並實作一轉換電壓為24 V/400 V，功率為500 W之雛型電路，以驗證本論文中所提轉換器之可行性。

A novel bidirectional DC-DC converter with high conversion ratio is proposed in this thesis. The proposed converter uses the coupled-inductor to achieve high voltage conversion ratio. In the boost mode, the proposed converter functions as a boost and flyback integrated converter with voltage doubler to increase the voltage gain. The switch voltage stress is reduced by clamping circuit and also the leakage-inductor energy is recycled. In the buck mode, the converter functions as an asymmetrical half-bridge flyback and buck integrated converter. The leakage-inductor energy is recycled by clamping circuit and all of the switches are turned on with zero-voltage-switching. The operating principles and steady-state analysis of the proposed converter are discussed. Finally, a laboratory prototype circuit with 24 V/400 V and output power 500 W is implemented to verify the feasibility of the proposed converter.

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