International Research Publication House
In this paper, the improved buck Power Factor Correction (PFC) converter topology is proposed. This topology is easier to achieve the simple structure compared with the conventional buck PFC converter. Dead zones in ac input current of traditional buck PFC converter can be eliminated by adding an auxiliary switch and two diodes. The improved buck PFC converter is to force that operates in Critical Conduction Mode (CCM) and improved constant on-time control is proposed and utilized. To meet the IEC61000-3-2 class C standard within the universal input voltage range with optimal control parameters, nearly unit power factor can be achieved and the input current harmonics can be minimized.