在下一個世代的照明應用高功率LED具有節能和高效率的優點，一般照明用LED驅動器多採用兩級架構來實現，前一級是功率因數修正電路，後一級才是負責輸出電壓和電流調節的直流對直流轉換器，然而兩級的架構具有兩個獨立的回授控制，加上零件數量無法有效減少使得成本增加，且體積無法縮小。在低瓦數LED照明應用其中成本是需考慮的因素，為了增加其附加價值，所以數位電源控制技術的利基就在於能增加電源產品的應用功能與彈性化設計。
本篇論文首先設計類比式以L6561為基礎之單級返馳式功率因數修正器，並對L6561之動作原理及控制方法進行分析與探討，接著採用Microchip開發的dsPIC33FJ16GS502數位訊號控制器為核心，實現數位電壓隨耦控制法及數位臨界導通模式之單級返馳式功率因數修正器，經由不同的控制方法以達到改善功因、穩定輸出電壓和數位變頻控制等目的。實驗結果驗證所提出數位控制演算法的正確性，而且顯示類比與數位控制方式皆可以實現效率高於85%和功率因數高於0.9之單級返馳式功率因數修正器。

High-brightness LEDs are energy-saving and cost-effective choices that enable the next generation of lighting applications. Typically, an LED driver with active PFC is implemented with two-stage topology. The first stage can achieve a near unity power factor and a low THD at universal input voltage range, while the second stage is used for the dc/dc conversion. However, two-stage topology has two independent feedback controls and a high component count, leading to an increased cost and size. In low-power lighting applications, where cost is the dominant issue, such an approach loses attractiveness. On the other hand, digital power control techniques are rapidly gaining market share as designers increasingly appreciate the advantages that the technology offers over its analog counterpart.
In this thesis, the digital control technology for single-stage flyback power factor corrector (PFC) is investigated. Firstly, one analog single-stage flyback PFC circuits is built using the L6561 PWM control IC. Next, using the same power stage, two digital control algorithms using the Microchip dsPIC33FJ16GS502 digital signal controller (DSC) are developed. The developed digital control algorithms include digital voltage follower control and digital critical conduction mode control. Finally, experimental results of these three single-stage flyback PFC circuits will be provided to validate the correctness of the proposed digital control algorithms. According to the experimental results, all the three presented PFC circuits can achieve efficiency higher than 85% and power factor higher than 90.

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