Design and Implementation of Phase Controlled Dimmable LED System with High Power Factor

• Main Authors: Bo-Wei Chang, 張伯偉
• Other Authors: 陳慎銚
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/s73t9s

碩士 === 國立虎尾科技大學 === 光電與材料科技研究所 === 101 === This thesis proposes the design and implementation of phase controlled dimmable circuit for LED lighting system with high power factor and dimming features. The adjustable output current of LED lamp is regulated by controlling the conducting angle of a TRIAC device of the proposed system. The proposed circuit consists of a TRAIC, a boost converter and flyback converter. The boost converter is adopted as power factor correction and is operated in boundary conduction mode (BCM). The peak current control mode of the boost converter is operated to meet the power factor requirement. The adjustable output current of flyback converter is determined by the conducting angle of the triac device. The prototype of system is implemented to achieve the purpose of dimming, and then to verify the feasibility and characteristics of the proposed circuit in this thesis.