Performance Comparison and Design of Passive Components for DC-DC Buck-Boost, Cuk and Sepic Converter

With recent development in distributed generation, power demand can be mitigated utilizing DC power and its grid integration. Depending on the grid voltage level, proper selection of DC-DC converter is very essential to optimize the size, compactness and cost of the inverter-transformer assembly. Also, there are so many DC-DC converter topologies among which the step-up/down topologies are very useful to maintain the output voltage level as desired, and also offers a wide range of input resistance. In this proposed work, a comparison between three types of step-up/down converter, i.e., Buck-Boost, Cuk and Sepic converter has been inspected with respect to the sizing of passive components and its cost-effectiveness. The transfer function models are developed through which frequency response and damping ratio of the converters are estimated, so that proper selection of converter along with the passive elements can easily be achieved.