Non Isolated Low Cost Single Stage Buck-Boost AC to DC Converter

Abstract

In the conventional AC-DC converters for buck-boost operation, there are two stages involved. In this method of conversion, at first the AC is rectified into DC by rectifier and then using chopper, DC is varied as per the requirement of the load in buck or boost mode. The main drawback in the double stage conversion is that, as the stages of conversion increases the losses also increase proportionally. Moreover, it also decreases the efficiency of the converter and increases the cost. To overcome all these drawbacks, the conversion is done using single stage of conversion. This is achieved by connecting anti parallel of two buck-boost converters. One is operated in positive half cycle whereas another one is designed to operate in the negative half cycle. Simulation of the proposed work is carried through MATLAB/SIMULINK environment and prototype hardware implementation is carried through microcontroller to verify the real time performance.