Comparative Analysis of Transformer Less Bi-directional DC–DC Converter and Conventional Converter for Battery Charging-Discharging Applications

In this paper, comparison of transformer less bi-directional dc–dc converter with conventional buck-boost converter topology is done. BDC has many advantages such as power flow in both directions, high gain, high efficiency, simple circuit structure, reduced switching components, with wide voltage range, reduced switching loss due to zero voltage switching, reduce voltage stress and reduced size. Bi-directional converters are of different topologies and are used for different applications based on their features. Isolated converters are bulky and are of large size due to high frequency transformer, therefore they are useful for static energy storage applications, whereas transformer less BDC are lightweight and convenient for dynamic applications like Electric Vehicle. BDC with energy storage devices is used for frequent start–stop of motors and electric vehicles. BDC is also helpful in energy transfer between two dc buses of different voltage level. Transformer less converter topology is compared with traditional converter topology which is simulated in MATLAB/SIMULINK.