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Contribution à l'identification et à l'estimation des contraintes de fatigue thermique des convertisseurs intégrés pour la traction électrique

Abstract : ln the field of a reliability study on power electronic components dedicated to electrical traction, the identification then estimation of the thermal constraints generated during operation are very important. Indeed, with their repetition over the time, they induce a thermal fatigue, which consequence is the material damage of the component. This phenomenon leads to an evolution of the electrical and thermal characteristics of the power modules and appear as one of the major causes of failure listed for electrical traction where thermal cycling constraints are severe. After done a state of the art of the components used in the electrical traction and formulate the theoretical basis required for the comprehension and the resolution of the problematic, we focused to estimate the IGBT power module lifetime used in an automotive hybrid vehicle. Thus, after a recording, with an original method with optical fibres, the chips temperature on a vehicle in operation in an urban traffic, then an identification of thermal cycles with a statistical method of the temperature distribution, we have done some power cycling tests with the intention of estimate the module lifetime under different constraint levels. Finally, with a correlation ofthese two tests, we've been able to estimate the strong presented by these modules versus the repetitive of the thermal constraints generated and reinforce the automotive manufacturers in their request of the lifetime. Finally, we have focused on the estimation of the thermal constraints generated, first, in DUAL module, with an unidimensional RC model. Then, with the use of a model taking into account the thermal interactions between chips, we have looked the case of the multichip integrated converters. In this last study, the model has been validated experimentally on a hybrid traction line and allows us to obtain thermal constraints generated in real operation conditions on a normalised European road mission profile. Finally, with this study, we have shown the possibilities of this tool in the supervision and prediction of the thermal constraints during operation of the integrated power converters.
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Stéphane Carubelli. Contribution à l'identification et à l'estimation des contraintes de fatigue thermique des convertisseurs intégrés pour la traction électrique. Autre. Université Henri Poincaré - Nancy 1, 2003. Français. ⟨NNT : 2003NAN10105⟩. ⟨tel-01746916⟩

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