Digitally Controlled Boost PFC Converters Operating with Large Scale Load Fluctuations

When boost power factor correction （PFC） circuit works with large scale load fluctuations, it is easy to cause a higher total harmonic distortion and a lower power factor because of traditional controllers and inductor cur- rent mode. To solve this problem, this paper proposes a PFC control system,...

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Bibliographic Details
Published inTransactions of Tianjin University Vol. 20; no. 4; pp. 292 - 298
Main Author 刘艳莉 王清龙 王宇翠 张烨 朱乐为
Format Journal Article
LanguageEnglish
Published Heidelberg Tianjin University 01.08.2014
Subjects
Engineering
Humanities and Social Sciences
Mechanical Engineering
multidisciplinary
PFC
Science
功率因数校正
升压式
控制系统
数字控制
电路工作原理
负载
转换器
large scale
load fluctuation
power factor correction (PFC)
feed-forward
input voltage
system decoupling
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Summary:When boost power factor correction （PFC） circuit works with large scale load fluctuations, it is easy to cause a higher total harmonic distortion and a lower power factor because of traditional controllers and inductor cur- rent mode. To solve this problem, this paper proposes a PFC control system, which can operate with load fluctuations up to 1 000 W by using duty cycle feed-forward control theory to achieve smooth switching mode. The duty cycles in the next period of the control system are pre-estimated in the current cycle, which enhances the speeds of AD samplers and switching frequency, and reduces the cost and volume of the equipment to some extent. Introductions of system decoupling and feed-forward of input-voltage greatly improve the system performance. Both theoretical simulation and experimental results prove the advantage of the proposed scheme.
Bibliography:When boost power factor correction （PFC） circuit works with large scale load fluctuations, it is easy to cause a higher total harmonic distortion and a lower power factor because of traditional controllers and inductor cur- rent mode. To solve this problem, this paper proposes a PFC control system, which can operate with load fluctuations up to 1 000 W by using duty cycle feed-forward control theory to achieve smooth switching mode. The duty cycles in the next period of the control system are pre-estimated in the current cycle, which enhances the speeds of AD samplers and switching frequency, and reduces the cost and volume of the equipment to some extent. Introductions of system decoupling and feed-forward of input-voltage greatly improve the system performance. Both theoretical simulation and experimental results prove the advantage of the proposed scheme.
Liu Yanli, Wang Qinglong, Wang Yucui, Zhang Ye, Zhu Lewei（School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China）
12-1248/T
power factor correction （PFC）; large scale; load fluctuation; system decoupling; feed-forward; input voltage
ISSN:1006-4982
1995-8196
DOI:10.1007/s12209-014-2194-x