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Analysis of Ripples in SEPIC based Buck-Boost Converter for Low Power Applications

This paper analyzes the SEPIC based Buck-Boost converter for continuous input current with reduced ripples. In this proposed work, the inductor current before the switch is analyzed for a single switch operation carrying a series of LC combinations in a ladder like arrangement providing a ripple reduced voltage signal at the output. Also, due to the presence of single switch, low voltage stress is monitored on the switch with a high voltage gain. Two different modes of the converter topology are discussed for understanding its current and voltage equations of the passive components present in the circuit. The magnitude of ripples present in each branches of LC combination is analyzed mathematically and in simulation as well. Subsequently, the ripple analysis is followed by ripple mitigation by employing a Ladder Ripple Subtraction (LRS) technique. In which, the ripples in the LC combinations of the ladder arrangements are measured and averaged to produce a ripple reduced reference current. The performance analysis presented in the paper helps the designer to design the converter, which will be adequately suitable for renewable energy and electric vehicle applications. This proposed analytical work is designed and analyzed its performance metrics in simulation platform using MATLAB / Simulink.