Transient thermal FE-model calibration based on thermal structure functions for power modules

The thermal finite element model of the power module based on the actual physical conditions is not easy to be consistent with the experimental results, limited by the accuracy of the input conditions. In this paper, a method of calibrating the transient thermal finite element model using the measured thermal structural function is proposed and practiced. The structural functions derived from the simulation finite element model are compared with the experimental one. Based on the comparisons, the modification of the detailed model can greatly improve the accuracy of the simulation. Finally, the transient thermal response characteristics of the calibration model and the experimental results were compared, demonstrating the operability and feasibility of the method.