1. Department of Power Electronics and Energy Control Systems, Faculty of Electrical Engineering, Automatics, Computer Science and Biomedical Engineering, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland
2. Research and Development, SMA-Magnetics Sp. z o.o., Komandosów 3/1, 32-085 Modlniczka, Poland