High Efficiency Single-Stage Flyback Power Supply Unit for LED Lighting Applications

• Main Authors: CHEN JUNG-HO, 陳榮和
• Other Authors: 歐勝源
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/437j9z

碩士 === 國立臺北科技大學 === 電力電子產業研發碩士專班 === 99 === This thesis mainly presents a 96W single-stage power supply unit for LED lighting. The proposed power supply is designed and implemented using a flyback converter topology operating in the boundary conduction mode control. The power switch can be turned on with naturally zero-current-switching and the switching losses can be reduced to increase the conversion efficiency. By a constant current feedback circuit, the designed flyback converter regulates LED current directly. The proposed power supply can achieve high power factor for wide input voltage range. High-frequency operation in flyback converter shows that parasitic components associated with power transformer have great influences on the behavior of the converter. Some experimental results are given to verify the correctness of analysis and practicability of proposed suppression method.