Design and Performance Analysis of DC-DC Sepic Converter for Specific Input Range

In distributed generation system, proper utilization of DC power and its integration to grid have become a major role to mitigate the power demand. Conversion of DC power is very much essential such as AC-DC-DC and/or AC-DC-AC as per requirement of the utility. Also, DC voltage level is to be maintained at a desired value. In this context, Research on different types of DC-DC step-up/down converters have already been carried out previously. This proposed work focuses on a DC-DC Sepic Converter with specific range of input voltage. Based on this, the estimation of parameters is being studied accordingly. For constant output voltage, performance analysis has been investigated both under open-loop and closed-loop configuration depending on calculated duty ratio. A mathematical modelling has been established to find out the stability of the converter with estimated parameters both for minimum and maximum input voltage. It is observed that the parameters computed for minimum input voltage exhibits better response than maximum input voltage. Moreover, closed-loop design with the same parameters ensures better response than the open-loop responses.