Buck Converter with AC Sweep Analysis
This demonstration shows how to perform a Steady-State Analysis and obtain different open-loop transfer functions using AC Sweep Analysis for an unregulated buck converter with a resistive load. The AC Sweep Analysis applies a set of sinusoidal perturbations to the system under study. At each of these user-specified frequencies it then finds the periodic steady-state operating point of the perturbed system, and extracts the system response using Fourier analysis. One advantage is that the user can choose specific frequencies of interest when investigating a transfer function. For detailed information see this tutorial.


To run an AC Sweep Analysis double-click on the AC Sweep Analysis block to open the dialog and click on the Start analysis button. The progress of the analysis is displayed in the MATLAB Command Window. When the analysis has finished a new Bode plot will be displayed showing the corresponding transfer function.
A demonstration of a Loop Gain Analysis is given in the demo model Buck Converter with Loop Gain Analysis.