Comparative Analysis of Single Phase and Multiphase Bi-Directional DC-DC Converter

Abstract

A dc-dc converter has its applications, such as in hybrid vehicles, solar inverters, in power supplies for microprocessors etc. A bidirectional dc-dc converter can be alternately operated as a step down converter in one direction of energy flow and as step up converter in reverse direction of energy flow, in places where both the sides have voltage sources. A high voltage supply using a single converter is not preferred as it leads to high ripple in output voltage and current, thus requiring large value of inductor and filter capacitor. To overcome these limitations multiphase interleaving technique is used in bidirectional dc-dc converters i.e. connecting the converters in parallel with the switching instants equally distributed among them. This paper presents a comparative study of the single phase and multiphase bi-directional dc-dc converter and the optimization of inductor and filter capacitor. The open loop simulation is done using simulink tool and conclusions are drawn.