Contribution à l'étude des phénomènes de fatique thermique des modules IGBT de forte puissance destinés aux applications de traction

Abstract : The recent use of the hybrid integration technology of high power IGBT modules in traction applications instead of the classically used presspacked thyristors or GTOs introduced new questions conceming the reliability of the modules' packaging when subjected to the traction thermal cycles. The aim of this thesis is to contribute to understand the failure mechanisms of IGBT modules in traction environment. Therefore, a good knowledge of the aging accelerators and the failure indicators is indispensable. The long term goal of the study is to help to find a law expressi11g the modules life time as a function of their working conditions. To treat the problem, we chose an experimental approach consisting in power cycling accelerated tests and technological and failure analysis. We validated a contact temperature measurement method on silicon chips surface which was used to localize and evaluate the highest thernial stress in power cycling conditions. These measurements made it possible to evaluate a thermal model of the modules packaging using LAASTHERM software. A local thermomechanical modeling of the modules with the finite element method was also achieved and provided the mechanical stress in the weakest interfaces of the packaging. We finally proposed an empirical aging model but we didn't get enough experimental data to validate it
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_1998_HAMIDI_A.pdf
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https://hal.univ-lorraine.fr/tel-01752306
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Submitted on : Thursday, March 29, 2018 - 1:40:43 PM
Last modification on : Monday, April 16, 2018 - 10:41:33 AM

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Amina Hamidi. Contribution à l'étude des phénomènes de fatique thermique des modules IGBT de forte puissance destinés aux applications de traction. Autre. Institut National Polytechnique de Lorraine, 1998. Français. ⟨NNT : 1998INPL050N⟩. ⟨tel-01752306⟩

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