A modified Push-Pull pre-regulator based on three-state switching cell

Abstract

This paper presents a single-stage high power factor AC-DC converter based on modified Push-Pull employing three-state switching cell. The topology of the three-state switching cell provides lower current stresses in the switches, since only half the input power is processed by the active switches. Thus, only half the input peak current flows through the switches, reducing conduction and switching losses, hence making the use of this converter very attractive for applications in larger power levels. The volume and weight of magnetic elements is reduced, since they operate at a twice the switching frequency of switches. A theoretical analysis and design example of the proposed converter as well as experimental results for a 1.5kW prototype are presented in this work.