Beiträge zur Modellbildung und Charakterisierung der Verluste induktiver Komponenten

The continuous development and use of energy-efficient power electronics are essential for achieving greenhouse neutrality and the associated requirements for future energy sytems. In addition, volume and weight reduction as well as a reduction in costs, particularly in vehicle electronics, are important development goals. When designing power electronic systems, a trade-off must always be made between these different development goals. In order to achieve the aforementioned goals, inductive components should be optimally adapted to a given circuit topology as well as to the respective application, especially due to the fact that such technological leaps as with semiconductors are not yet apparent with inductive components. In this context, it is necessary to determine the losses of inductive components with a sufficient accuracy and as a function of relevant circuit parameters. The detailed consideration of the latter issue is the central subject of this work. The first section focuses on the modeling of winding losses. A novel numerical method for the determination of losses in high-frequency litz wires is presented, in which the structure of the litz wires is explicitly taken into account. Core losses represent another loss component. A metrological characterization of Mn-Zn ferrites is carried out to investigate the main factors influencing the specific core losses with regard to their use in DC/DC converters. The results are modeled using a novel formulation of the Steinmetz equation derived in this work. Finally, the major loss contributions of inductive components are combined into a single comprehensive loss model for the use in circuit simulators.