Design And Implementation Of High Power DC-DC Converter Using Zero Voltage Switching

Abstract

DC-DC converters are electronic devices which used whenever we want to change DC electrical power e ciently from one voltage level to another. Rising energy in- tensity leads to a higher cost of delivering power and low power density. Meanwhile, the demand for compact power supplies grows signi cantly. It requires power sup- plies with high e ciency, low cost and high power density. In this case, we need high frequency switching technology for its smaller size installation. A general so- lution to achieve higher volumetric e ciency is by increase the switching frequency, which leads to size and weight reduction of the capacitive and magnetic components. Hard switching mode of operation, higher frequency results in higher switching losses and EMI problems. So that resonant-mode of operation, which recently has become more popular for low switching losses at high frequency. High switching frequency is used to reduce the size of power supply and switching losses are minimized with the use of resonant technique.Simulation of the proposed project high power DC-DC con- verter is done in MATLAB; results are obtained for hard switching and soft switching topology. Hardware implementation is done with hard switching and soft switching topologies.The proposed high power DC-DC converter scheme is experimentally ver- i ed under 3.5 kW load operation. The scheme is simple and compact with less number of power switching devices. Also compare result of hard switching topology with soft switching topology; analyze IGBT losses, efficiency and power density at higher frequency.