Design of non-isolated integrated type AC-DC converter with extended voltage gain and high power factor for Class-C&D applications

Abstract

In this paper, an integrated buck-boost buck (IB3) AC-DC converter is proposed with an extended voltage conversion ratio for the class-C&D applications. The proposed converter process the power from input to output in a single stage. This converter is an integration of traditional buck-boost converter and a buck converter shared by a common switch. To get unity input power factor the input buck-boost converter is designed to operate always in discontinuous conduction mode (DCM). The output buck converter is operated in continuous conduction mode (CCM). The necessary design equations have derived using theoretical analysis under steady-state conditions. The features of IB3 converter are fast and tightly regulated dc voltage with extensive voltage gain, unity input power factor and well suit for class-C&D applications with universal voltage range. The proposed IB3 converter is simulated using MATLAB/SIMULINK software to support the theoretical analysis.