Transient and Steady-State Analysis of a SEPIC Converter by an Average State-Space Modelling

This study presents a simple and effective methodology for analyzing transient and steady state behavior of a Single Ended Primary Inductance Converter (SEPIC), operating in a continuous current mode (CCM). The proposed technique uses an average state-space modelling approach including power losses in converter elements. This approach makes possible obtaining analytical solutions for the converter currents and voltages and allows examining different characteristics of converter behavior, e.g. efficiency, output to input voltage ratio, input current, transient times, and elements stresses. This methodology is valuable for keeping the converter design in compliance with design requirements, including dynamics, and reduces the need for accurate time domain simulations. This approach can be useful for analyzing other types of high order converters.