A DC pulse converter supplied by a source with inductivity, (a usual case in electric traction) must have an entry filter (Fig. 1). In this paper a theoretical analysis of physical phenomena in such a converter is presented and current and voltage waveforms in the system converter - filter are derived. (Fig. 5). From the results of these analyses relations for preliminary drafts elements of circuit-filter choke (Lf), capacitor (C) and smoothing choke of the motor (Lm) is derived. These parameters are determined under simplifying conditions and the limits of applicability of such results are shown. By reason of making the parameters more accurate a method of computer simulation is used, where the preliminary determined parameters of the elements as starting dates are used. The results of the simulation experiments (Fig. 9 - 12) give a quick solution, which secures to achieve the prescribed ripple of the motor current, of the input current and of the filter capacitor voltage.
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