Implementation of Digital High Power Factor LED Driver

• Main Authors: Kun-Wei Lin, 林坤緯
• Other Authors: Sung-Chun Kuo
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/26915284008148874974

碩士 === 崑山科技大學 === 電機工程研究所 === 101 === This thesis presents the design and implementation of a DSP-based digital-controlled high power factor LED driver circuit. By using the average-current-mode control technique, the problems of low power factor and high input current distortion occurred in the conventional AC/DC converter and the nonlinear load characteristic of the LED can be improved. First, the boost converter applied to active power factor correction is analyzed and discussed. Secondly, the small-signal perturbation model is derived to design the current and voltage controllers. Inner loop current control will use active power factor correction technology, the average current control method to improve power factor. For outer loop voltage control, phase lag controller is adapted to achieve the output regulation performance. Finally, in the experiment, a digital signal processor controller high power factor LED driver, the driver specifications for input voltage 80 ~ 140 Vrms, the output voltage is 400 V and the maximum output power of 160W. By measuring results verify the drive input voltage and load variations below, have a good regulation characteristics, power factor up to 0.9733 or more, and meets IEC6100-3-2 Class D current harmonic power of international norms.