LED Driving Circuit with Adjustable Output Currents

• Main Authors: Chun-Yi Tsai, 蔡駿毅
• Other Authors: Yi-Hwa Liu
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/73e8dq

碩士 === 國立臺灣科技大學 === 電機工程系 === 105 === 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 %.