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In this paper comparison of various topologies of dc-dc converter for electric vehicular application are presented. Non-isolated converter is the first one and the second one is isolated dc-dc converter. Non-isolated dc-dc converter have low cost and simple, but there is one drawback in it that input and output are not isolated each other. To overcome this drawback, an isolated dc-dc converter is used. An isolated dc-dc converter consist of transformer, which is used to step-down and step-up the voltage as well as it isolate the input and output. To trigger the converter switches, Sinusoidal-Pulse-Width- modulation technique is preferred. Comparison of proposed model of various dcdc converter are simulated in MATLAB Simulink. The simulation results helps to select the best converter for electric vehicle.
The electrification of the transportation has importantly augmented in past ten years. This is mainly to drop down the utilization of greenhouse emissions and fossil fuels. Battery operated vehicles are deliberately giving place of the vehicle based on internal combustion engine as one of the key for future transport, which offers better petroleum economy and lower emissions. Though, the increasing exploitation of these vehicles could have a great impact on the grid. Lately, the contamination problems with fast populace growth are turn out to be world problems. Due to the least amount of air contamination and small or zero greenhouse gas emissions, hybrid electric vehicle (HEV) and electric vehicle (EV) technology is growing interest as an alternate solution in most of the countries around the world. Cars and trucks are liable to produce 25% of CO2 emission and other transportation methods account for another 12% of CO2 emission. Electric trucks and electric cars are often cleaner than the engine operated vehicles. Thus a number of developments conceded to turn down of electric vehicles. Electric vehicles are different from fossil fuel power-driven vehicles. In electric vehicles power is consumed, which is generated from sources like including nuclear power, fossil fuels and renewable sources such as wind power, solar power and tidal power. The extensive adoption of the electric vehicle fetch considerable changes for society in terms of technologies which we utilize for own transportation. It also does our economies away from fuel.
In conclusion, this paper distinguished two dc-dc converter for electric vehicular application. The first converter are a buck, boost, buck/boost non-isolated and the second converter is an isolated. The input and output values of isolated converter (battery, transformer and dc motor) are given in table no. 1. Simulation of non-isolated and isolated dc-dc converter has studied and simulated using MATLAB/Simulink. The non-isolated Buck/Boost converter seems to have lot of merits over the filters size and simple control, the dual active bridge stick out when isolation is necessary between input and output. Analyzing the requisite of the segregation, the Buck/Boost needs an supplementary isolation circuit to assure that it respects the charging and discharging level and standards, while in isolated converter consist of a transformer that acquiesce it to comprehend a propulsive isolation between the input circuit and output circuit and assure the users safety. Future scope of this proposed system is that, bidirectional non-isolated and isolated dc-dc converter can be introduced and performance of this converters can be figure out in MATLAB/Simulink for Battery Fed Electric Vehicle
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