Advanced Design of Switched-Mode Power Supplies in a General Purpose Computing Platform

Switched-mode power supplies are present in almost every piece of modern technology from high power motor drives to small power consumer electronics. Being non-linear and switching systems, their stability can not be accurately assessed by conventional techniques such as eigenvalue analysis, as it often fails in providing the overall picture. Nevertheless, for this class of circuits no commercially available tools implement any stabilityanalysis method based on more refined modeling approaches such as the hybrid dynamical systems formalism, the shooting method (SHM) and Floquet theory. In this paper we provide the designer with the main guidelines to implement these techniques in a general purpose computing platform, such as MATLAB®, with a reasonably low effort. An isolated SEPIC converter is used as an example to highlight how the proposed procedure is capable of detecting non-robust designs, providing guidance to a better choice of the converter parameters and easily accounting for non-ideal transformer coupling.