Soft-Switched Boost DC-DC Converter System for Electric Vehicles using An Auxiliary Resonant Circuit

The paper introduces soft switching of a Boost Converter which can be included in the Electrical Vehicle technology. In order to raise the motor power rating, the DC link Vehicles, there is a great need for less component stress, smaller voltage of inverter up to 400V, and higher efficiency. The conventional Boost Converter generates switching loss at turn on and off thus the whole system's efficiency is reduced. The proposed converter utilizes soft switching method using an auxiliary switch and resonant circuit. So a natural zerovoltage switching method for the whole switches is achieved without additional device to reduce switching loss and device inrush voltage stresses. Therefore, the converter reduces switching loss lower than the hard switching. These advantages make the new converter promising for high power density applications. The operation principles of the converter and the conditions for realization of soft switching are analyzed by the MATLAB/Simulink. Its simulation results prove that all the switches in soft switching state and the efficiency of the converter is helpful in lossless operation of Electric Vehicles. keywords— Electric Vehicle, Boost Converter, Hard Switching, Zero Current Switching, Zero Voltage Switching, Electromagnetic Interference.