Dual-monitoring protection circuit for switching transistor

Details Dual-monitoring protection circuit for switching transistor Dual-monitoring protection circuit for switching transistor

1980-06-16

1983-02-22

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 98, 361101, H02H 338

Patent

active

043750737

ABSTRACT:
A transistor having a selectively saturated emitter collector path is protected.
The emitter collector voltage level is sensed as being greater than a predetermined level to indicate saturation as is the presence and absence of drive current to the base. In response to the transistor not being activated to saturation while the drive current is applied to the base, a fault indication is derived. In response to the fault being indicated, the transistor is prevented from conducting by decoupling a source of operating voltage and current from the emitter collector path and/or decoupling the drive current from the base.

REFERENCES:
patent: 3408589 (1968-10-01), Nishioka
patent: 3449598 (1969-06-01), Wright
patent: 3534249 (1970-10-01), Neill et al.
patent: 3854089 (1974-12-01), Emler
patent: 3914667 (1975-10-01), Waldron
patent: 3946301 (1976-03-01), Love
patent: 4158866 (1979-06-01), Baker

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