Variable-On-Time-Controlled Critical-Conduction-Mode Flyback PFC Converter

A variable on-time (VOT) control strategy for a critical conduction mode (CRM) flyback power factor correction (PFC) converter with low total harmonic distortion (THD) and high power factor (PF) is proposed in this paper. By using input voltage and the voltage across the auxiliary winding of the fly...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2014-11, Vol.61 (11), p.6091-6099
Main Authors: Yan, Tiesheng, Xu, Jianping, Zhang, Fei, Sha, Jin, Dong, Zheng
Format: Article
Language:English
Subjects:
Customer relationship management
Frequency conversion
Switches
Switching frequency
Voltage control
Windings
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Summary:A variable on-time (VOT) control strategy for a critical conduction mode (CRM) flyback power factor correction (PFC) converter with low total harmonic distortion (THD) and high power factor (PF) is proposed in this paper. By using input voltage and the voltage across the auxiliary winding of the flyback transformer to modulate the turn-on time of the switch of the CRM flyback PFC converter, the PF and THD of the converter can be improved. The operation principles of the traditional constant on-time (COT)-controlled CRM flyback PFC converter and VOT-controlled CRM flyback PFC converter are analyzed. The experimental results show that the PF and THD of the VOT-controlled CRM flyback PFC converter are better than those of the COT-controlled CRM flyback PFC converter.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2014.2311401