本論文研製高效能LED室內照明系統，以數位化單級返馳式功因修正轉換器為主要電路架構。一般的LED電路包含功因修正電路及直流-直流轉換器，本論文所研製之單級返馳式功因修正轉換器，具備較少元件數、降低成本及提高效率等優點。本電路除了應用於室內照明外，還並聯一雙向直流-直流轉換器，在市電正常供電期間可儲存電能於鋰電池中，可做為緊急照明時所需之電力來源。本論文電路規格為20 W的單級返馳式功因修正轉換器、10 W的雙向直流-直流轉換器及9.6 W的LED燈條。最後實作以單級式轉換器完成了近似兩級式轉換器之功能，其輸出電壓為48 V，輸出電流為0.416 A，輸入電壓為交流市電110 V，整機效率在90 %以上。

This thesis is to study and implement a high-efficiency LED drivers for indoor lighting applications. The main power circuit topology is a single-stage flyback power factor corrector (PFC). Generally, an LED driver includes a front-stage PFC and a post-stage DC-DC converter. The presented single-stage Flyback PFC features less component counts, lower cost, and higher efficiency. In addition to the indoor lighting applications, a bidirectional DC-DC converter is also incoporated to charge the Li-ion batteries during normal grid supply, and to light up the LED for emergency usage. The output power rating of the bidirectional DC-DC converter is 10 W. A 9.6-W LED light bar is driven by the single-stage flyback PFC with an input votage of 110 VAC, an output voltage of 48 V, and an output current of 0.416 A. The overall conversion efficiency is up to 90 %.

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