Inverter bridge controller implementing short-circuit...

H - Electricity – 02 – M

Patent

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H02M 1/12 (2006.01)

Patent

CA 2563457

A fault handling system for short circuit recovery in three-phase multiple- level inverter bridges, used to drive inductive loads, which waits for either desaturation of switches or expiration of a delay period based upon an amount of time before saturated switches are damaged before commanding off switches that are saturated, and which artificially creates a dead-short across the three-phase output to force switches conducting a fault current to desaturate. By delaying the switching-off of the inverter bridge during a fault, waiting for desaturation to occur, the statistical likelihood of switch survival is improved.

L'invention concerne un système de gestion de pannes destiné à la gestion de courts-circuits dans des ponts inverseurs multi-niveaux triphasés, employés pour piloter des charges inductives. Ledit système de gestion de pannes attend une désaturation de commutateurs ou l'expiration d'un délai sur la base d'une durée antérieure à l'endommagement de commutateurs saturés, avant de couper des commutateurs saturés. Ledit système de gestion crée par ailleurs, de façon artificielle, un court-circuit parfait au travers de la sortie triphasée afin de forcer les commutateurs à conduire un courant de panne pour la désaturation. Du fait de la temporisation de la coupure du pont inverseur au cours d'une panne visant à attendre une désaturation, la probabilité statistique de survie des commutateurs est augmentée.

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