本論文研製一雙向高轉換比直流-直流轉換器，此轉換器具雙向傳遞能量之功能，亦能藉由抽頭電感達到高轉換比，因此可應用於高電壓差之直流匯流排與電池之間的雙向能量轉換。本文先探討雙向高轉換比直流-直流轉換器之動作原理，其後分析其降壓與升壓模式下之穩態電氣特性與重要參數設計。最後實作一高壓側400 V，低壓側24V，額定功率240 W之雛形電路以驗證上述理論分析之正確性。經由實驗結果得知，於降壓模式時，在60%負載時的條件下，系統最高效率為91.3%；於升壓模式時，在60%負載時的條件下，系統最高效率為90.6%。

In this thesis, a bidirectional DC-DC converter with high conversion ratio is designed and implemented. It can achieve high voltage conversion ratio by tapped-inductor and bidirectional power conversion. Therefore, it’s suitable for bidirectional energy transfer between DC bus and battery with high voltage conversion ratio. The analysis of operating principle is discussed at first. Then, steady-state electrical characteristics and parameter design in both step-down mode and step-up mode are analyzed. Finally, a laboratory prototype with high side voltage of 400 V, low side voltage of 24 V and rated power of 240 W is implemented to validate the theoretical analysis. As the experimental results shown, the maximum efficiency of the system is 91.3% at 60% load in step-down mode and 90.6% at 60% load in step-up mode.

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