單級驅動電路一般係使用於低功率之LED光源驅動電路。然而在單級LED驅動電路中使用電解電容則將會嚴重地縮短其壽命。
　　本論文之目的係為研製一具主動功率因數修正之無電解電容發光二極體驅動器。本文係研究一雙級之架構，其由一降壓式功率因數修正轉換器與一隔離式反逆型SEPIC轉換器所組成。此雙級電路之工作原理以及設計流程在本文中將會分析與探討。
　　本論文實作並測試一48W之驅動電路驗證其可行性，並與本文提及之理論相互驗證之。

The single-stage driver circuit is commonly used for low-power LED lighting applications. However, the use of electrolytic capacitors in the single-stage LED driver will seriously shorten the lifetime.
This thesis aims to design and implement an electrolytic capacitor-less LED driver with active power factor correction (PFC). A two-stage LED driver which consists of a buck PFC converter and an isolated inverse-SEPIC converter is studied. The operating principles and design considerations of the two-stage circuits are analyzed and discussed.
A 48W laboratory prototype is built and tested to verify the feasibility and theoretical analysis of the proposed scheme.

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