Active Clamped Current Fed Buck – Boost Converter For Traction Applications

In recent years, the increase of energy demand and the problems of fossil-fuel sources due to their environmental pollution and future shortages, have led to the development of technologies need to use non-polluting alternative energy sources such as solar and wind sources. Growing demand, advancements in semiconductor technology and magnetic materials such as high frequency inductor cores, has a significant impact on PV topologies and their efficiencies. This paper presents analysis and design of active clamped current fed buck-boost converter for traction applications. The source voltage is taken from the PV Array. PV Array is developed using basic circuit equations of the photovoltaic (PV) solar cells including the effects of solar irradiation and temperature changes. The Buck boost converter is used in this paper to boost up the PV Array voltage. The proposed system consists of a PV Array, buck-boost converter and HF DC/DC converter. The designed converter maintains ZVS of all switches from full-load down to very light load condition over wide input voltage variation. The additional auxiliary active clamping circuit absorbs the turn-off voltage spike limiting the peak voltage across the devices allowing the selection and use of low voltage devices with low on-state resistance. And this converter is given to the dc series motor. The proposed system can improve the voltage at the load. The performance of the proposed system was analysed using MATLAB/SIMULINK