本論文主旨在於設計與研製具省電模式低損耗之交流/直流電源轉換器。本文建構準諧振返馳式轉換器之功率損耗模型，利用MathCAD®計算電路之功率損耗，並針對準諧振返馳式轉換器在不同負載下之損耗分析以提出系統之控制策略。最後，設計一省電模式下之控制方法，以改善輕載時之系統效率。並實做一寬廣輸入交流電壓為90~264 Vrms、輸出為24V/4.17A之交流/直流電源轉換器，以驗證理論分析。電路於264 Vrms且極輕載0.25 %時之損耗為160 mW，通過能源之星規範。

In this thesis, an AC-DC flyback converter with low power loss during low load condition is designed and implemented. In this thesis, an AC-DC flyback converter with low power loss during low load condition is designed and implemented. A power loss model and breakdown of the quasi-resonant flyback converter is not only derived, but also analyzed with MathCAD®. Finally, a control method with burst-mode duty control is designed to improve the system efficiency under light load condition. A laboratory prototype quasi-resonant flyback converter with universal range input voltage of 90~264 Vrms and output 24V/4.17A is implemented to verify the theoretical analysis. The power loss of the quasi-resonant flyback converter at 0.25% load and 264 Vrms is 160m W that achieve the Energy star standard.

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