本論文研製一具高轉換比之非隔離型直流-直流雙向轉換器，主要採用耦合電感和切換電容以達到較高的電壓轉換比，並加上箝位電路回收漏感能量及降低開關之電壓應力。此轉換器由低壓側轉換能量至高壓側時，具有兩條連續電流路徑，降低轉換器的導通損失，並可降低電流漣波，以提升轉換器的整體效率。本論文首先介紹與回顧以已知之雙向轉換器架構，並針對本文所提出之轉換器架構進行詳細的工作原理與穩態分析。最後，以數位信號處理器TMS320F28335作為主架構控制器實作一低壓側電壓 48~60 V、高壓側電壓400 V、額定功率為1 kW之雛型電路，以驗證本論文中所提雙向轉換器之可行性。由實驗結果可知，此轉換器操作於升壓模式之最高效率為95.1%，滿載效率為 93.5%；操作於降壓模式之最高效率為95.6%，滿載效率為94.8%。

A non-isolated bidirectional dc-dc converter with a high voltage conversion ratio is implemented in this thesis. To achieve high conversion ratio, coupled inductor and switched capacitor are applied. The voltage stress on the switch can be reduced by a clamping circuit, and the leakage energy is recycled. When the converter transfer energy form low voltage side to high voltage side, the conduction losses and current ripple can be significantly reduced to improve the system efficiency because of two continuous current paths. Moreover, Several bidirectional converters are reviewed first, and the operating principles and steady state analysis of the proposed converter are discussed in detail. Finally, a prototype with low voltage side voltage (VL) 48~60 V, high voltage side voltage (VH) 400 V, and rated power 1 kW is built with digital signal processor TMS320F28335 to verify the performance. As shown by the experimental results, the maximum efficiency and full load efficiency are 95.1% and 93.5% in step-up stage, respectively; 95.6% and 94.8% in the step-down stage, respectively.

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