本論文分析半橋式零電壓切換三階轉換器，適用於高電壓輸入場合，此電路架構初級側功率開關元件應力為輸入電壓之一半，有利於功率開關元件之選用。控制方式採用相當普遍的市售類比IC UCC3895，以實現零電壓切換，有效降低切換損失進而提升效率。最後配合SIMPLIS軟體之模擬，實際完成一台電壓輸入範圍為800 V~1000 V、輸出為48 V/750 W、滿載效率94 %之直流-直流轉換器，初級側功率開關元件選用耐壓為650 V，驗證了此架構之可行性。

The main purpose of this thesis is to analyze a half-bridge zero-voltage-switching (ZVS) three-level DC-DC converter, which is suitable for high input-voltage applications. The voltage stress of the primary-side power switch is equal to half the input voltage. Therefore, it is easy to choose the power switch device. The control method adopts the commonly-used commercial analog IC UCC3895 to reach ZVS and reduce the switching loss effectively. So the conversion efficiency can be improved. With the aid of the simulation software tool, a 750-W DC-DC converter with an input voltage range of 800 V ~ 1000 V, an output voltage of 48 V is implemented. The full-load efficiency is up to 94 %. The voltage stress of the primary-side power switch device is selected 650 V. As a result, the feasibility for this DC-DC converter architecture is verified.

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