本論文主要研製一台可提供瞬時高功率之全橋相移轉換器，保有正常工作下的效率表現，並且可在瞬間提供1.8倍滿載功率。設計策略為在傳統全橋相移轉換器中加入變頻電路，在正常工作狀態下，控制方式仍以脈波相位調變(Pulse Phase Modulation, PPM)進行；在提供瞬時高功率的狀況下，控制信號相移角度達到最小，同時改以脈波頻率調變(Pulse Frequency Modulation, PFM)的控制方式。藉由降低操作頻率，爭取更大的有效責任週期範圍以穩定輸出電壓。同時建立全橋相移直流信號等效模型，從中推導直流信號轉移函數，藉由數學運算詳細分析降頻對全橋相移轉換器所提升的增益影響。最後建立一套設計流程，方便設計各種規格之可提供瞬時高功率全橋相移轉換器。

The objective of this thesis is to design and implement a full-bridge phase-shift (FBPS) converter with short-duty peak power capability. The converter is capable of providing 1.8 times the full-load power in a brief instant, with no deteriorative effect on the efficiency during normal operation. This is accomplished by incorporating a variable frequency controller into the conventional FBPS converter. During normal operation, pulse phase modulation (PPM) control is used. While it is required to deliver the peak power, the phase angle is kept at a minimal value and pulse frequency modulation (PFM) control is utilized instead. By reducing the operating frequency, the effective duty cycle for regulation of output voltage is maximized. At the same time, we have established the DC-signal equivalent model and derived its transfer function to analyze the relationship between operating frequency and voltage gain. Finally, a design procedure is formulated in order to simplify the design for other similar converters in the future.

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