An Improved Buck PFC Converter with High Power Factor

Abstract: In This paper an improved buck power factor correction (PFC) converter topology is proposed in this paper. By adding an aux-iliary 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).In this paper of voltage source and current wave form in by using MATLAB/SIMULINK

Keywords: Buck Power Factor Correction (PFC), critical conduction mode (CRM), zero voltage switching (ZVS).