Transient Non-linear Thermal FEM Simulation of Smart Power Switches and Verification by Measurements

TL;DR

This paper validates a non-linear silicon thermal model through transient FEM simulations and measurements of Smart Power Switches, demonstrating the importance of non-linear properties in thermal behavior prediction.

Contribution

It verifies the accuracy of a common non-linear silicon thermal model using experimental data from Smart Power Switches during overload events.

Findings

Non-linear silicon properties significantly affect thermal impedance.

Simulation results match measurements during overload conditions.

The silicon model's validity is confirmed for transient thermal analysis.

Abstract

Thermal FEM (Finite Element Method) simulations can be used to predict the thermal behavior of power semiconductors in application. Most power semiconductors are made of silicon. Silicon thermal material properties are significantly temperature dependent. In this paper, validity of a common non-linear silicon material model is verified by transient non-linear thermal FEM simulations of Smart Power Switches and measurements. For verification, over-temperature protection behavior of Smart Power Switches is employed. This protection turns off the switch at a pre-defined temperature which is used as a temperature reference in the investigation. Power dissipation generated during a thermal overload event of two Smart Power devices is measured and used as an input stimulus to transient thermal FEM simulations. The duration time of the event together with the temperature reference is confronted with simulation results and thus the validity of the silicon model is proved. In addition, the impact of non-linear thermal properties of silicon on the thermal impedance of power semiconductors is shown.