Using spectral analysis to determine the equivalent circuit of the output filter of DC-DC converters at their operating frequency

The aim of this paper is to present an on-line technique which can be used to determine the equivalent circuit of the storage elements of DC-DC converters at their operating frequency. This technique can be used not only for the determination of both inductor and capacitor equivalent circuits, but also as a fault diagnostic technique, in order to evaluate the state condition of these components.