由於製程與材料的發展，使得發光效率亦優於白熾燈泡的高亮度發光二極體應用於照明領域。一般LED電源應用上，單級返馳式功率因數修正器採用不連續電流導通模式(DCM)，藉以透過簡單電路架構而達到高功率因數之目的。
本篇論文首先設計類比L6561與TL494之單級返馳式功率因數俢正器，並對單級返馳式功率因數俢正器之動作原理及控制方法進行分析及探討，接著再以Microchip dsPIC30F2020為數位控制核心，取代市售的TL494 IC，並實現數位電壓隨耦控制法之單級返馳式功率因數修正器。此三種控制方法均採用相同單級返馳式功率因數修正器為拓撲，經由不同的控制方法以達到輸出穩壓、改善功因和數位定頻控制及提供更彈性的設計之目的。實驗結果證明所提出之數位化單級返馳式功率因數修正器除了具有簡單的電路拓樸和控制方法，整體電路性能皆符合設計規格之要求。

High-brightness LEDs are energy-saving, cost-effective choices that enable the next generation of lighting applications. Despite large output voltage ripple, single-stage AC-DC conversion is a more attractive solution than two-stage conversion from the stand point of cost and power density. Especially in applications like LED lighting and battery charger. 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, two analog single-stage flyback PFC circuits are built using the L6561 and TL494 PWM control ICs, respectively. Next, using the same power stage, a digital control algorithm using the Microchip dsPIC30F2020 digital signal controller (DSC) is developed. Finally, experimental results of these three single-stage flyback PFC circuits will be provided to validate the correctness of the proposed digital control algorithm. According to the experimental results, all the three presented PFC circuits can achieve efficiency higher than 84% and power factor higher than 90%.

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