Fault protection circuit for power switching device

Details Fault protection circuit for power switching device Fault protection circuit for power switching device

1994-04-05

1995-09-05

Hoff, Marc S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 89, 361 90, 361 91, H02H 904

Patent

active

054484413

ABSTRACT:
A fault protection circuit for a power switching device. The circuit compes a driver circuit electrically connected to the power switching device, a saturation comparator electrically connected to the collector of the switching device to determine if the switching device is switching an excessive voltage, and two undervoltage comparators to determine if the gate is receiving sufficient voltage. If the gate is oversaturated the saturation comparator enables the gate of a field effect transistor which drains the gate of the switching device, and the saturation comparator also disables the driver circuit. The undervoltage detectors detect insufficient voltage to the driver circuit and disable the driver circuit. Once the driver circuit is disabled the control circuitry can take corrective action.

REFERENCES:
patent: 4658203 (1987-04-01), Freymuth
patent: 4665459 (1987-05-01), Bynum et al.
patent: 4893212 (1990-01-01), Wong et al.

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