JEE_V5_N2_RP5 S.A. Elankurisil S.S. Dash Journal on Electrical Engineering 2230 – 7176 5 2 27 33 Z source converter, Sepic Converter, Bidirectional dc-dc converter, Matlab, Microcontroller This paper presents the sepic converter and z converter performance are analyzed, sepic converter produces very high voltage for giving small Input voltage, reduce the total harmonic distortion to improve the efficiency form 89% to 95%. The matlab version 7.3 using for simulation results at constant frequency is used in UPS, high density discharge lamp fuel cell system and photovoltaic systems. Hardware is closely agree with the simulation result sepic converter is more advantages than z-converter they are high step up capability, design flexibility and distributed voltage stress can be achieved. To maintain continuous Input current and clamped voltage stress on switch. December 2011 Copyright © 2011 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1582