Title :
Design Considerations of Soft-Switched Buck PFC Converter With Constant On-Time (COT) Control
Author :
Wu, Xinke ; Yang, Jianyou ; Zhang, Junming ; Xu, Ming
Author_Institution :
Coll. of Electr. Eng., Zhejiang Univ., Hangzhou, China
Abstract :
In contrast to the conventional boost power factor correction (PFC) converter, the buck PFC converter can achieve high efficiency in the entire universal input voltage range. A critical conduction mode (CRM) soft-switched buck PFC converter with constant on-time control is presented in this paper. The design methodology and criteria for zero-voltage switching range, high efficiency and low harmonics of the CRM buck ac-dc converter are achieved. A 100-W prototype built up according to the proposed design criteria shows that the input current harmonics meet the IEC61000-3-2 (Class D) standard and the efficiency is higher than 0.965 during the universal input range.
Keywords :
power factor correction; switching convertors; zero voltage switching; IEC61000-3-2 Class D standard; boost power factor correction converter; constant on-time control; critical conduction mode; current harmonics; power 100 W; soft-switched buck PFC converter; zero-voltage switching; Capacitors; Converters; Harmonic analysis; Inductors; Switches; Zero voltage switching; AC–DC; buck power factor correction (PFC); high efficiency; zero-voltage switching (ZVS);
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2011.2145391
