本論文旨在研製一採用寬能隙元件之高效率LLC串聯諧振轉換器，藉由提高切換頻率以縮小磁性元件的體積，並比較CoolMOS與GaN-FET兩種功率開關元件。本論文針對具同步整流之LLC串聯諧振轉換器動作原理進行討論，實際完成一組輸入電壓範圍90 Vac~264 Vac、操作頻率500 kHz、輸出為12V/ 160W、整體效率90%的電源供應器。同時也在未來展望提及後續可能的研究方向，以提高效率與電路完整性，期待本論文所研製之電路可以更具實用性。

This thesis focuses on the study and implementation of a high-efficiency LLC series resonant converter (SRC) with wide band-gap devices. CoolMOS and GaN-FET, are applied as the power switches and compared their performance in the converter circuit. The operating principles are analyzed and discussed. A prototype converter with an input AC voltage range from 90 Vac to 264 Vac , the operating frequency of 500 kHz and an output of 12 V/ 160 W is implemented and tested. The efficiency at rated load is 90%. Future researches are also mentioned to improve the efficiency and make the circuit more practical.

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