A Fast and Accurate Junction Temperature Estimation Method of IGBT Modules for PMSM Drives Considering Multiple Working Conditions

In this research, a dynamic junction temperature estimation method using the built-in negative thermal coefficient (NTC) thermistor in multi-chip IGBT modules with transient thermal model is presented. This method can be applied to online estimation of junction temperature for electric vehicles. Under the premise of ensuring its accuracy, a low-order thermal network considering thermal coupling is used, which is verified by the experimental results. The experimental results show that the proposed method can predict the junction temperature quickly and more accurately than the conventional method under multiple extreme working conditions.