Transient protection circuit using common drain field effect tra

Details Transient protection circuit using common drain field effect tra Transient protection circuit using common drain field effect tra

1990-07-02

1993-03-30

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 58, 361 91, 361111, H02H 904

Patent

active

051989573

ABSTRACT:
A transient protection circuit provides protection from high voltage transients appearing along a transmission line by sensing a predetermined threshold of the voltage developed thereon and opening the conduction path through first and second switching circuits in the transmission line. The switching circuits are implemented with first and second serially coupled transistors sharing a common drain and enabled by a control signal during normal operation. The first and second transistors each have a diode oriented to conduct from the source to the drain for bi-directional operation. During high voltage transient conditions, a sensing circuit detect a predetermined threshold of the potential on the transmission line and disables one of the first and second transistors which opens the conduction path through the first and second switching circuits thereby suppressing the surge currents flowing therethrough.

REFERENCES:
patent: 4495536 (1985-01-01), Bynum
patent: 4533970 (1985-08-01), Brown
patent: 5027250 (1991-06-01), Cini et al.

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