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Fiabilité fonctionnelle et mécanismes de dégradation des TRIACs soumis aux chocs thermiques par di/dt à la fermeture

Abstract : TRIACs are bi-directional current switches that are generally protected from perturbations, like dV/dt, by a Snubber circuit. This circuit creates, at the turn-on of the TRIACs, high current pulses (di/dt) responsible of the early degradation of the power devices. The author studies the thermoelectric and thermomecanical effects of the turn-on TRIACs under strong di/dt through transient ISE simulations and failure analysis. The degradation mechanism is characterized by the formation of hot spots in the structure (silicon undergoes a thermal shock) that induce mechanical tensile forces in the die. These cycles of mechanical stress develop the initial defects in fatigue micro-cracks in the silicon bulk or at the interface with the metallic contact. The statistical analysis of the thermal fatigue of the TRIACs shows that the device failures folow a Weibull distribution. An extrapolation law, obtained theoretically from the degradation mechanism, is validated by accelerated life tests. This law is used to estimate the lifetime of the TRIACs under nominal di/dt for a defined application
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Stéphane Forster. Fiabilité fonctionnelle et mécanismes de dégradation des TRIACs soumis aux chocs thermiques par di/dt à la fermeture. Electronique. Université Paul Verlaine - Metz, 2001. Français. ⟨NNT : 2001METZ037S⟩. ⟨tel-01775481⟩

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