Modeling of Pulse Transformers with Parallel- and Non-Parallel-Plate Windings for Power Modulators

The parasitic capacitances of transformers significantly influence the resulting pulse shape of a power modulator system. In order to predict the pulse shape and adapt the geometry of the pulse transformer before constructing the transformer an equivalent circuit and analytic expressions relating the geometry to the parasitic elements are needed. Therefore, in this paper equations based on the geometry of the transformer for parametrizing an equivalent circuit consisting of 6 lumped capacitors are presented. The equations are verified by measurement results for pulse transformers with parallel- and non parallel-plate windings and a solid state modulator designed for linear accelerators.