本論文主要克服全橋轉換器在寬輸出電壓範圍應用所面臨變壓器與寄生元件對電路所產生的影響，次級側的整流開關有電壓突波，因此提出一以返馳式轉換器形式作為緩振器並應用於具交流開關次級側整流全橋轉換器中，文中提出的返馳式轉換器形式之緩振器將電壓突波的能量儲存至緩振器的儲能電容上，再利用返馳式轉換器的原理，把能量傳送回輸入端，達到能量回收的效果，且讓次級側整流開關的電壓應力得以降低。
主架構採用全橋轉換器且次級側使用兩組中心抽頭式整流繞組並將其串聯輸出，其整流二極體使用交流開關取代，然而當全橋初級側於死區時間時，交流開關限制了飛輪狀態的發生，因此增加一續流二極體以提供輸出電感之續流路徑，透過交流開關之工作週期調整，將兩組輸出電感儲能時間錯開，以降低初級側之電流峰值。最後實現輸入電壓380 V，輸出電壓範圍60 V至400 V，輸出功率1600 W，切換頻率80 kHz之全橋轉換器，其轉換效率在滿載情形下最高可達92%以上。

This thesis proposed the solution for Full-Bridge Converter in application of wide output voltage range, because the parasitic element cause the voltage spike on the secondary side rectification. A flyback-based clamp circuit is used for a Full-Bridge Converter that used AC switches for secondary side rectification. The flyback snubber stores the energy of voltage spike into the capacitor and transfers the energy to input which makes the spike energy recovery and reduce the voltage stress.
The main architecture uses two sets of center-tapped rectifying windings and series the outputs, and the AC switches replaced the rectifying diodes. However, when the primary side of the full bridge is in the dead time, the freewheeling is limited by the AC switches. Adding a freewheeling diode to provide a freewheeling path for the output inductor. Regulate the duty cycle of the AC switches to divide the output inductor energy storege time and lower the current peak of the primary side. Finally, the circuit achieves an input voltage of 380 V, an output voltage range of 60 V to 400 V, an output power of 1600 W, a full-bridge converter with a switching frequency of 80 kHz, and an efficiency is up to 92% at full load.

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