1. Laboratory for Power Electronics, INATECH—Department of Sustainable Systems Engineering, University of Freiburg, Emmy-Noether-Straße 2, 79110 Freiburg, Germany
2. Fraunhofer Institute for Applied Solid State Physics, Tullastrasse 72, 79108 Freiburg, Germany
3. Fraunhofer Institute for Mechanics of Materials IWM, Wöhlerstrasse 11, 79108 Freiburg, Germany