Digitally controlled boost PFC converters operating with large scale load fluctuations

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• 作者：Yanli Liu (1)
  Qinglong Wang /a> (1)
  Yucui Wang (1)
  Ye Zhang (1)
  Lewei Zhu (1)
  
• 关键词：power factor correction (PFC) ; large scale ; load fluctuation ; system decoupling ; feed ; forward ; input voltage
• 刊名：Transactions of Tianjin University
• 出版年：2014
• 出版时间：August 2014
• 年：2014
• 卷：20
• 期：4
• 页码：292-298
• 全文大小：583 KB
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• 作者单位：Yanli Liu (1)
  Qinglong Wang /a> (1)
  Yucui Wang (1)
  Ye Zhang (1)
  Lewei Zhu (1)
  
  1. School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072, China
  
• ISSN：1995-8196

文摘

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 current 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.