Implementation of A Phase-Shifted PWM Dimmer for LED Indoor Lighting

• Main Authors: Yu-Shen Chen, 陳昱慎
• Other Authors: Ming-Tang Chen
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/28604441302359307636

碩士 === 國立高雄應用科技大學 === 電機工程系 === 98 === In order to save the illumination electrical energy, this thesis used high-power white LED as the light source in designing indoor lamps. An AC-DC single-stage flyback converter was employed to implement the driving, and analog IC TDA4863 was used to achieve high power factor and high efficiency features. In addition, this thesis proposed the phase-shifted PWM method to reduce electric drop of the power transistor of the dimming LED array. Finally the results of the above two sections were combined to produce a prototype of indoor lighting lamps, and different dimming ways of characteristics of the optical and circuit were also analyzed. The results confirm that phase-shifted PWM dimming can effectively improve the overall efficiency and reduce harmonic distortion.