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An Enhanced Cascaded Topology of Non-Isolated Bidirectional DC-DC Converter with Switched Coupled Inductor
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Abstract
Today bidirectional DC-DC converter is used as energy storage system, which have high efficiency technology because single converter can be able to perform both step up and step down conversion operation. The bidirectional converter consists of isolated and non-isolated transformer which appears depending on the applications. During the step up and step down operation, the converter causes current stress through the close switch or the voltage stress across the open switch. Hence, the winding loss is occurred due to the presence of magnetic storage elements such as leakage or parasitic inductance’s. These problems are overcomed by the proposed topology i.e., an enhanced cascaded topology of non-isolated Bidirectional DC-DC converter for refining the effectiveness of the conversion. The enhanced topology is operated by soft- switching, continuous inductor current and fixed switching frequency. In the proposed DC-DC converter topology, the coupled inductor performance has been improved by the switched coupled-inductor. The cascading purpose of the proposed topology is to regulate the conversion accuracy of the non-isolated Bidirectional DC-DC converter. As the cascading is one of the wide area techniques to operate the DC-DC converter with reduced switching stress and voltage spikes across the switch during turn OFF. In this proposed topology, multi level enhanced cascading is adopted. The proposed converter is implemented in MATLAB working platform and the output performance is analyzed.
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