Accession Number : ADD017752

Title :   Fault Protection Circuit for Power Switching Device.

Descriptive Note : Patent, Filed 5 Apr 94, patented 5 Sep 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Raposa, John R

Report Date : 05 Sep 1995

Pagination or Media Count : 10

Abstract : A fault protection circuit for a power switching device. The circuit comprises 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.

Descriptors :   *PATENTS, *ELECTRONIC SWITCHING, *ELECTRICAL GROUNDING, CONTROL, FIELD EFFECT TRANSISTORS, SATURATION, PROTECTION, POWER EQUIPMENT, CIRCUITS, DRIVES(ELECTRONICS), FAULTS, CIRCUIT BREAKERS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE