Analysis of a High Step-Up “Improved $\Gamma$-Z-Source” DC-DC Converter

Abstract

Output voltage of PV panel and Fuel-Cell are low and shading effect also influence on output voltage level, so a high gain dc-dc stage usually is needed. In this paper, a high step-up “improved $\Gamma$ -Z-Source” dc-dc converter is proposed which based on “improved $\Gamma$ -Z-Source” ( $\mathrm{I}\Gamma\text{ZS}$ ). In comparison with existing topologies, the proposed topology has higher voltage gain and higher efficiency. Moreover low voltages stress is applied on the switch under the same conditions. Also using a single magnetic core instead of several magnetic cores in coupled inductor are the advantages of this topology. Shared ground between input and output cause simple control and reduce complexity. Finally the proposed converter draw continuous current from input source that apply low stresses on input panels or fuel cells. Operation principle, theoretical equations and simulation in PSPICE, are given to validate performance of the proposed converter.