“…The analysis of acoustic emission (AE) signals is widely used to detect damage in solid materials. The most popular areas of application are the supervision of fatigue phenomena and cracks in steel structures [ 1 , 2 , 3 , 4 ], rolling elements in bearings [ 5 , 6 ] or the occurrence of partial discharges in power transformers [ 7 , 8 ] and medium voltage switchgears [ 9 , 10 , 11 ]. There have been attempts at recognizing AE signals in low voltage insulated gate bipolar transistors (IGBTs) [ 12 , 13 , 14 , 15 , 16 ] even with changes of junction and case temperature [ 17 ].…”