Title :
An Improved Buck PFC Converter With High Power Factor
Author :
Xie, Xiaogao ; Zhao, Chen ; Zheng, Lingwei ; Liu, Shirong
Author_Institution :
Coll. of Autom., Hangzhou Dianzi Univ., Hangzhou, China
Abstract :
An improved buck power factor correction (PFC) converter topology is proposed in this paper. By adding an auxiliary switch and two diodes, the dead zones in ac input current of traditional buck PFC converter can be eliminated. An improved constant ON-time control is proposed and utilized in this improved buck PFC converter to force it that operates in critical conduction mode (CRM). With optimal control parameters, nearly unit power factor can be achieved and the input current harmonics can meet the IEC61000-3-2 class C standard within the universal input voltage range. Moreover, the efficiency of the proposed converter is not deteriorated compared to the conventional buck converter. Detailed theoretical analysis and optimal design considerations for the proposed converter are presented and verified by a 100-W lab-made prototype.
Keywords :
IEC standards; optimal control; power convertors; power factor correction; CRM; IEC61000-3-2 class C standard; ac input current; auxiliary switch; critical conduction mode; dead zones; diodes; improved buck PFC converter topology; improved buck power factor correction converter topology; improved constant ON-time control; input current harmonics; nearly unit power factor; optimal control parameters; power 100 W; universal input voltage range; Equivalent circuits; Harmonic analysis; Inductors; Reactive power; Switches; Voltage control; AC–DC; buck power factor correction (PFC); class C; high efficiency; high power factor (PF);
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2012.2214060
