Modeling and Simulation of Closed Loop Controlled ZVS Push Pull DC to DC Converter

Abstract

This paper presents the modeling and simulation of closed loop controlled ZVS push-pull converter. The emphasis of this topology is to reduce the conduction losses and complexity of the circuit. The push-pull converter is used as DC-DC converter very suitable for low and medium power application. High efficiency, less switching loss and high power density are the predominance of this application. By boosting the switching frequency, high power density has been achieved as well as the complexity of the circuit reduces as size of the components reduced. Thus switching loss has to be minimized to achieve high frequency operation; this can be achieved by ZVS resonant techniques. This reduces switching losses as well as EMI. The aim of this work is to develop simulink model for closed loop controlled ZVS push-pull DC to DC converter. Here 48V DC is converted into high frequency AC using push-pull inverter. It is stepped down to 12V AC using step down transformer. The 12V AC is converted into DC using a rectifier. The switches of the push-pull converter operate in ZVS condition to reduce the switching loss. The closed loop voltage controlled DC to DC Converter which reduces the steady state error is modeled using the blocks of simulink and the simulation results are presented.