Using Zth matrix model for more accurate Tvj calculation for IGBT power modules

Conference: PCIM Asia 2021 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
09/09/2021 - 09/11/2021 at Shenzhen, China

Proceedings: PCIM Asia 2021

Pages: 6Language: englishTyp: PDF

Authors:
Zhang, Hao; Chen, Lifeng (Infineon Technologies Center of Competence (Shanghai) Co. Ltd., Shanghai, China)
Lassmann, Matthias; Yilmaz, Koray (Infineon Technologies AG, Warstein, Germany)

Abstract:
Thermal modelling of IGBT power modules is often done by considering only the transient ther-mal impedance Zth of each chip individually, and mostly the thermal cross-coupling effects is ne-glected. This may cause inaccuracies in junction temperature calculations or lifetime estimations. In this paper an advanced thermal model is pro-posed, which can combine the self-heating effects and all cross-coupling effects together in one Zth matrix. And the basic description and extraction of the Zth matrix model characteristics by FEM (Fi-nite Element Method) simulation is introduced. Then the Zth matrix model is built-up in PLECS software, and verified by the FEM simulations on transient power profiles. Finally, the improve-ments of Tvj calculation with Zth matrix model for wind application is discussed and summarized.