本論文主要探討全橋轉換器在寬輸出電壓範圍應用所面臨的問題，將介紹傳統硬切式全橋與全橋相移式轉換器各自之動作原理分析，並探討以上兩種架構應用在全橋升/降壓型轉換器時，因變壓器匝比的提高，其寄生元件對電路所產生的影響。
本論文提出一具交流開關二次側整流全橋轉換器，以全橋轉換器為基礎架構，使用兩組次級側整流繞組，將其輸出串聯來增加輸出電壓，並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。當全橋初級側於死區時間時，因交流開關限制了飛輪狀態的發生，使變壓器之跨壓不會被箝位在零伏，所以激磁感上的能量可將初級側功率開關之寄生電容能量釋放到零，達到零電壓切換之功能。
架構的部分，本論文採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，並增加一續流二極體以提供輸出電感之續流路徑，在交流開關之工作週期調整下，最後實現輸入電壓380 V，輸出電壓範圍150 V至500 V，輸出功率600 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95%以上。

This thesis mainly discusses the problems faced by full-bridge converters in the application of wide output voltage range. The action principle analysis of the traditional hard-switching full-bridge and full-bridge phase-shift converters will be introduced. And to explore the effect of the parasitic components on the circuit when the above two architectures are applied in a full-bridge boost/buck converter.
This thesis proposes a full-bridge converter that used the AC switch for secondary side rectification. Using two windings of secondary-side rectifying and connect their outputs in series to increase the output voltage. Through the duty cycle adjustment of the AC switch, the energy storage time of the two sets of output inductors is staggered to reduce the current peak of the primary side. When the primary side of the full bridge is in the dead time, the freewheeling is limited by the AC switch. Therefore, the voltage across the transformer will not be clamped at zero volts, so the energy on the magnetizing inductance can release the parasitic capacitance energy of the primary side power switch to zero, achieving zero voltage switching.
In the architecture part, this paper uses two sets of center-tapped rectifying windings and outputs them in series, and the rectifying diodes are replaced by AC switches. And adding a freewheeling diode to provide a freewheeling path for the output inductor. Finally, the circuit achieves an input voltage of 380 V, an output voltage range of 150 V to 500 V, an output power of 600 W, a full-bridge converter with a switching frequency of 80 kHz, and an efficiency is up to 95% at full load.

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