本論文提出一種高轉換比雙向直流-直流轉換器，此轉換器使用耦合電感與切換式電容來實現高轉換比。此外，本文討論了使轉換器可於數個工作週期內完成功率轉換之方法，並分析轉換器之工作原理與穩態特性，最後實作一24V/400V，功率400W之電路，進一步驗證本文中提到的轉換器的可行性。升壓模式的最高效率為92.1%，降壓模式為93.9%，並且模式轉態可於400μs內完成，而此種轉換器可以應用於儲能系統之電池與直流匯流排中。

In this thesis, a high conversion ratio bidirectional DC-DC converter that uses coupled-inductors and switching-capacitor to achieve a high conversion ratio is proposed. In addition, the power transition method is discussed, which can complete power transition in several duty cycles, and analyze the operating principle and steady state. Finally, a 24V/400V, power 400W circuit is implemented to verify the feasibility of the converter mentioned in this thesis. The highest efficiency is 92.1% in step-up mode, step-down mode is 93.9%, and the power transition can be transferred less than 400 μs. This converter is suitable for the batteries and DC bus in energy storage system.

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