Improved modulator for losses reduction in auxiliary railway power supplies

This paper presents the losses optimization through an optimal modulation strategy for auxiliary railway power supplies. The figures of merit analyzed to compare different modulation techniques are the transformer losses and the inverter losses. For the transformer losses a model has been developed for the special characteristics of this element due to its integrated magnetism. In the case of the switching devices, the losses have been obtained by means of a simulator. Both, the transformer and the switching device losses have been experimentally validated in a scale-down prototype, so the analysis can be extrapolated to other power converters.