Impact of Discrete-Time Modeling on Dual Input Modified SEPIC Converter

This chapter addresses aspects of the two-input modifiedModified Buck-SEPIC DC–DCTI-MBS (TI-MBS) converterConverter. This integrated converterConverter is processing powerPower from two sources, two switches, and four energy storageEnergy storage elements. The designed converterConverter is processing 48 V from two sources 36 and 60V. TheTransfer Function Model transfer function modeling of this converterConverter plays an important role in addressing crucial aspects like controllerController design, stabilityStability, and robustness issues. Here, two different types of transfer function modeling aspects are considered, continuous and discrete-timeTime. TheDiscrete-Time discrete-timeTime transfer function is derived by considering trailing-edgeTrailing-Edge and leading-edge digital pulse width modulationDigital pulse width modulation schemes. The converter parametersConverter parameters are designed based on the design equationsEquations. The transfer functions are obtained for the TI-MBSTI-MBS converterConverter in the MATLABMATLAB environment. The experimental validation of the TI-MBS converterConverter is performed through Hardware in LoopHardWare in Loop using the real-timeReal-Time environment of the OPAL-RT. For TI-MBSTI-MBS converterConverter pole-zero configurations and frequency responseFrequency response characteristicsCharacteristics are plotted. Using these plots important characteristicsCharacteristics related to the deviation in phasePhase angle of frequency responseFrequency response at higher frequenciesHigher frequency due to RHP zeros are observed. The simulation studies are performed considering a 36/60–48 V, 500 W, prototype, DC powerPower distribution systemDistribution system.