現今技術不斷創新的高亮度發光二極體(Light-Emitting Diode, LED)已引起照明領域的革命，而家庭中照明的用電量佔了家庭用電量約四分之一。與省電燈泡(Compact Fluorescent Light, CFL)相比，LED燈具的優點包括節能、無有毒物質、高可靠性以及高壽命。然而，實際上消費者所需要的LED燈具規格是不同的，代表每個LED燈具都需要專屬設計的電源，因此增加了電源的成本。為了解決這個問題，需要具有可調整輸出電壓及電流的LED驅動器。
在本論文中，提出了可驅動三種不同類型LED燈具的驅動電路。為了驗證本論文所提出系統的正確性，製作了一組14W的原型電路，並使用該電路進行實驗。根據實驗的結果，所製作的原型電路可以成功驅動三種不同類型的LED燈具，且轉換效率皆大於85%以上。

Nowadays, technological innovations in the high-brightness LED (Light-Emitting Diode) would lead a revolution in the field of lighting, which used about one-quarter of the electricity for home application. Comparing with compact fluorescent lamp (CFL), the advantages of LED lamps include energy saving, no toxic substances and high reliability and high lifetime. However, the specification of LED lamps varies according to consumer’s requirement, which means that each LED lamp requires specially designed power supplies at an additional cost. To deal with this problem, LED drivers with adjustable output voltage / current is needed.
In this thesis, a LED driving circuit which can drive three different kinds of LED lamps is proposed. To validate the correctness of the presented system, an 14 W prototyping circuit is first built and experiments are carried out using this platform. According to the experimental results, the constructed system can successfully drive three different kinds of LED lamps, and the conversion efficiencies are all higher than 85.0 %.

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