A Magnetically Coupled Converter Connected Three Phase Voltage Source Inverter for EV Applications

Abstract

The Electrical Vehicle (EV) is an obligatory segment is current era due the shortage of fossil fuel and increasing CO2 emissions. In EV the vehicles drive is consuming more energy than other part of vehicle appliances. The EV drives mainly are induction motor, permanent magnet synchronous motor, or BLDC motor. These motor are normally either in low voltage machines or high voltage machine. The high voltage machines are high cheap. However those motor drives need 600V DC-link for their full range operation. Hence, the high step DC to DC converter fed VSI is need for such a applications, which is need to give a voltage gain higher range since vehicle battery is only in the arrange of 24 V to 48 V. With this aim a non-isolated DC to DC converter is propose here with VSI. The referred DC to DC converter is operating based on transformer coupled and contains only one capacitor with tightly-coupled 3 winding transformer inductor arrangement. The inverter can increase the boost factor through changing shoot-through duty ratio and varying the amount of turns in the three-winding transformer. The proposed DC to DC converter more control degrees of freedom in terms its voltage gain, and therefore, improving the drive versatility is high. The PWM switching techniques are introduced to this converter fed VSI topology to control drive. The working principle of the proposed transformer based DC to DC Source fed VSI is analysed and simulated using MATLAB/Simulink system software. The lab