Transistor switching means

Details Transistor switching means Transistor switching means

1982-06-09

1984-02-07

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 88, 361 91, 361 18, 361 59, 323282, 330207P, H02H 308, H02H 720

Patent

active

044306849

ABSTRACT:
Transistor switching means in which a principal transistor (T.sub.5) feeds into a load (R.sub.c) when a control signal saturates a control transistor (T.sub.1), a resistance bridge (R.sub.3,R.sub.4) fed by a source (V.sub.AL) then polarizing the base of the principal transistor (T.sub.5).
An auxiliary transistor (T.sub.3 a) has its base coupled to the collector of the transistor (T.sub.5) by means of a diode (D.sub.2 a) and one of the two polarization resistances (R.sub.10 -R.sub.11). When the collector-emitter voltage of the principal transistor becomes too strong as a result of a short-circuit in the load, the auxiliary transistor (T.sub.3 a) is saturated and blocks the principal transistor (T.sub.5).
Application to detectors of the type having an electro-luminescent diode excited by pulses; these pulses, applied to the auxiliary transistor (T.sub.3 a) block it momentarily in order to ensure the re-setting of the circuit when the overload has disappeared.

REFERENCES:
patent: 3449598 (1969-06-01), Wright
patent: 3835368 (1974-09-01), Williams
patent: 4027228 (1977-05-01), Collins
patent: 4161760 (1979-07-01), Valentine

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