Zero-Crossing Distortion Analysis in One Cycle Controlled Boost PFC for Low THD*
A low-power low THD boost PFC with one cycle control is discussed. Two novel structures, the periodic self-starting timer and feedforward current control block, are introduced to reduce the zero-crossing distortion. The improved boost PFC could regulate the switch turn-on time timely according to the ac input line voltage, and reduce the distortion near the input voltage zero-crossing points significantly. The experimental THD is only 3.8％, the power factor is 0.998, the load adjust rate is 3％, the linear adjust rate is less than 1％, and the efficiency is 96.9％. Both theoretical and practical results reveal that the improved PFC meets the demands for low-power and low THD.
Yani LI Yintang YANG Zhangming ZHU Wei Qiang
Institute of Microelectronics, Xidian University, Xian 710071, China Xian Longtium Microelectronics Technology Developing Co., Ltd, Xian 710065, China
国际会议
2011 IEEE 9th International Conference on ASIC(2011年第九届IEEE国际专用集成电路大会)
厦门
英文
718-721
2011-10-25（万方平台首次上网日期，不代表论文的发表时间）