Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1992-06-24
1994-05-03
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
361 56, 361 91, 361111, H02H 906
Patent
active
053093097
ABSTRACT:
A switching circuit is provided for protecting semiconductors such as switching transistors against transients occurring in system voltage provided by an associated source of electrical energy. The circuit uses one or more avalanche transistors (124, 126, and 128) to apply electrical energy from the source thereof to associated loads (130, 132 and 134) with which they are in series. A processing device (116), which includes a microprocessor (150), monitors the system voltage and generates an output control signal that switches the avalanche transistors into a state of conduction so that the system voltage, including any voltage transients, appears substantially entirely across the loads. Using avalanche transistors as switching transistors provides a significant margin of time for the detection, processing and switching actions to occur without damage being done to the switching transistors by a voltage transient.
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Deboer Todd E.
Ford Motor Company
Lippa Allan J.
May Roger L.
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