Online junction temperature estimation using integrated NTC thermistor in IGBT modules for PMSM drives

摘要

Drastic junction temperature fluctuations of power modules in electric vehicles (EV) have a significant impact on system reliability. This paper aims to estimate the junction temperature of IGBT modules with direct coolant for permanent magnet synchronous motors (PMSM) under complex boundary conditions. The advantage of the thermal network proposed in this article is that it does not require any temperature sensor except the built-in negative thermal coefficient (NTC) thermistor. Finally, the good accuracy of this model is demonstrated by a series of experiments considering complicated boundary conditions and multiple working conditions.