Semiconductor protection against high energy transients

Details Semiconductor protection against high energy transients Semiconductor protection against high energy transients

H - Electricity

02

H

H02H 7/20 (2006.01) H03K 17/0812 (2006.01)

Patent

CA 2075555

FMC 0292 PUS -22- 89-313 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 a switching device (18), including any number of avalanche transistors, to apply electrical energy from the source thereof to a load (20) with which it is in series. A voltage sensor (12) monitors the system voltage and generates a transient detection signal whenever it detects a voltage transient. A processing device (16) is used to process the transient detection signal and generate 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 load. 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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