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Step Up and Step Down Converter Based On Three State Switching Cell for High Power Applications

Anna Joy, Elizabeth Sebastian, Reenu George

This paper presents a step up and step down dc to dc converter based on the three state switching cell.It can be used for high power applications.The circuit consists of two switches two diodes and two coupled inductors.This topology has 3 switching stages, thus the name given as three state switching cell. In this circuits only part of load power is transferred by the switches so switching stress is less and high power output up to 1.5 KW can be attained. Advantages of this topology are less size and volume of components, wide area of continuous conduction mode. Step up and step down converter have overlapping and non-overlapping modes. When duty ratio is less than 0.5, we can achieve non -overlapping and continuous conduction mode. Input voltage is taken as 200V, in buck converter 60V output and in boost converter 282V output is obtained at duty ratio 0.3.Simulations are done in SIMULINK/MATLAB.