Design and Implementation of Two-Stage LED Driver

• Main Authors: Fang-De Dai, 戴芳德
• Other Authors: Yu-En Wu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/25558648453822980222

碩士 === 國立高雄第一科技大學 === 電子工程研究所 === 99 === This thesis proposes a two-stage LED driver system which possesses two sets output source, in order to keeping the brightness of LED load. The first-stage of the proposed system is power factor correction circuit which possesses whole voltage range and implemented by boost converter. It can apply to 85~265V, 50/60Hz, the output voltage is 400V, so it can use to all over the world. The boost converter is operated in boundary conduction mode to improve the power factor. The second-stage of the proposed system is forward converter which is used to reduce input voltage 400V to 30V. The converter designs the third winding to transfer the magnetizing inductance energy to second winding for maintaining the output voltage stability. Finally, a two-stage driver circuit is implemented to identify the functionality and feasibility of the proposed system.