本論文提出具順向能量相移式全橋升壓轉換器，轉換器採用相移式全橋(Phase-Shifted Full-Bridge)轉換架構採用零電壓切換脈波寬調變(ZVS-PWM)方式來驅動。轉換器共有五個轉換狀態，能量功率傳送狀態、第一次諧振狀態、能量保持狀態、第二次諧振狀態及轉向狀態等，均有詳盡的推導及模型化。利用諧振電感的輔助繞組建立順向回復能量轉移至負載可降低諧振振鈴和增加效率。本文對整個系統建立起小信號模型及轉移函數分析，且提供完整的設計考量和設計步驟。
最後實際設計製作一部輸入電壓48V、輸出電壓為250V、輸出功率為600W的實例，且完成特性規量格測(η=80%)及開迴路系統的模擬(Isspice)驗證。

關鍵字：相移式全橋轉換器，零電壓切換脈波寬調變，順向回復能量

Abstract
This thesis presents a phase-shift full-bridge step-up converter. An H-diagonal full-bridge structure driven by ZVS-PWM is proposed. The converter has five conversion states that include power-deliver state, first-resonant state, energy-holding state, second-resonant state, and commutation state. An auxiliary winding around resonant inductor is built to transfer the forward recovery energy to load so as to reduce the resonant ringing and increase efficiency. Small signal analysis and design consideration are conducted to verify the system performance and set up system design, respectively.
A practical design of 600W step-up power converter with 250V output is examined. Complete system design, simulation, and realization are proceeded to investigate the system performance. The converter can operate with ZVS and can provide high efficiency up to 80%. Simulation and experimentation are so close to the theoretical prediction.

Keyword：Phase-shift full-bridge converter, ZVS-PWM, forward recovery energy

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