Fault detection apparatus for a transformer isolated...

H - Electricity – 02 – H

Patent

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H02H 7/20 (2006.01) H03K 17/082 (2006.01)

Patent

CA 2071405

A protection circuit which electrically isolates logic level and high-side circuits and detects high side power device fault conditions at the isolated, logic level side of the circuit. When an overvoltage or overcurrent condition occurs at the power switching device, a protection circuit disables the conduction of current through the current carrying terminals of the switching device, preventing damage from occurring to the device. Activation of the protection circuit effects an increased current flow in the secondary and primary coils of the isolation transformer between the low side and high side elements. Voltage at the primary coil of the isolation transformer is monitored by low level circuitry to detect the rise in current, indicating a fault to the system controller upon detection.

Circuit de protection électrique servant à isoler le circuit logique du circuit à haut potentiel et à détecter les défaillances d'un dispositif de puissance à haut potentiel dans le circuit logique isolé. En cas de surtension ou de surintensité au niveau du dispositif de commutation de puissance, le circuit de protection empêche le courant de traverser les bornes conductrices du dispositif de commutation et de l'endommager. L'activation du circuit de protection entraîne une circulation accrue du courant dans la bobine secondaire et la bobine primaire du transformateur d'isolement, entre les éléments à bas potentiel et à haut potentiel. La tension au niveau de la bobine primaire du transformateur d'isolement est contrôlée au moyen de circuits à bas niveau qui détectent toute montée de courant et signale la défaillance au régisseur de système.

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