本篇論文主要研製具寬輸入電壓範圍串聯諧振直流/直流轉換器，其電路架構係由升降壓轉換器(Buck/Boost Converter)及串聯諧振轉換器(Series-Resonant Converter, SRC)所組成，並利用輸出電壓分壓回授產生一脈波寬度調變(Pulse Width Modulation, PWM)信號，提供升降壓轉換器使用而達成輸出穩壓。為了提升電路整體效率，於串聯諧振轉換器二次側使用同步整流(Synchronous Rectification, SR)技術，升降壓轉換器各功率開關皆能操作於零電壓切換(Zero-Voltage-Switching, ZVS)以降低開關切換損失。本論文電路採用定頻方式可承受大範圍輸入電壓，最後依設計實作一台19 V/150 W之雛型電路，量測在不同輸入電壓情況下，均可滿足高效率特性要求。

This thesis focuses on the study and implementation of a series-resonant DC/DC converter with wide range of input voltage. The circuit architecture is composed of a buck/boost converter and a series-resonant converter (SRC). By using the output voltage feedback, a pulse-width-modulation (PWM) signal is generated and sent to buck/boost converter for voltage regulation. In order to raise the conversion efficiency, the synchronous rectification (SR) is applied on the secondary side of SRC. All primary switches can be operated under zero-voltage-switching (ZVS) to reduce switching losses. Constant frequency can be used and a wide range of input voltage can be achieved. Finally, a 19 V/150 W laboratory prototype was implemented and tested. High efficiency can be achieved under different input voltage conditions.

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