本論文提出一“高昇/降壓比雙向DC-DC轉換器”，應用於轉換電壓差距較大之電池電壓與直流匯流排電壓。當高昇/降壓比雙向DC-DC轉換器操作在放電模式時，輸入為電池電壓，輸出為直流匯流排，其電路特性為順向轉換器與返馳式轉換器疊接，故可獲得高電壓增益，並回收漏感能量至輸出電容，提高轉換器效率；操作在充電模式時，輸入為直流匯流排，輸出為電池電壓，電路特性為返馳式轉換器與降壓轉換器經耦合電感組成。論文中首先介紹數種基本的雙向DC-DC轉換器，並探討高昇/降壓比雙向DC-DC轉換器電路動作原理與穩態電路分析，最後實作低電壓為24 V、高電壓為200 V及輸出功率200 W之高昇/降壓比雙向DC-DC轉換器，以驗證電路可達到雙向傳送能量之功能。

A bidirectional DC-DC converter with high step-up/step-down voltage ratio is proposed. It is used to bidirectional transform energy between low-voltage battery and high-voltage DC bus. When the proposed converter is operated in the discharging mode, input is battery and output is DC bus. Circuit characteristic is composed with forward converter and flyback converter. Because the output side is cascade connected, the high step-up voltage ratio is obtained. When it is operated in the charging mode, input is DC bus and output is battery. It is integrated with flyback converter and buck converter by coupled inductor. Several bidirectional converters are briefly reviewed in thesis at first. And then, operational principles and steady-state characteristics are discussed. Finally, a bidirectional DC-DC converter with low voltage 24 V, high voltage 200 V and output power 200 W is implemented to validate theoretical analysis.

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