Abstract
A new method for computer-aided analysis of differential mode input filters is presented in this paper, aiming to compute in an efficient manner input current spectra of switching converters in a wide frequency range. The method is intended to facilitate computer-aided design of input filters, and it is based on simulation of accompanying averaged circuit and superimposing the switching ripple to the averaged waveforms. A method to derive a continuous-time averaged circuit model is described. To obtain the model, the converter is partitioned into a circuit part, characterized by equations common for describing electric circuits, and a modulator part, which generates duty ratio functions. Three modulation methods are described, and superposition of associated switching ripple is formalized for each of them. The method is illustrated in simulation of two converters on the design of their input filters.
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