Correlating NTC-Reading and Chip-Temperature in Power Electronic Modules

Abstract:
In power electronic designs, the instantaneous chip temperature is of major importance to the user. In case the chip can’t be accessed, additional sensors like NTCs can be used to measure a temperature that depends on the chip temperature. From this value, a chip temperature can be estimated. Determining the thermal correlation between chip temperature and sensor reading is not a trivial task. The present paper gives an insight into a basic but reliable procedure to extract the necessary information using an experimental setup.