Supervisory circuit for parallel connected devices

Details Supervisory circuit for parallel connected devices Supervisory circuit for parallel connected devices

1974-05-15

1976-02-03

Pitts, Harold I.

Communications: electrical

Audible indication

Pneumatic-type sound producer

3402131, G08B 2300

Patent

active

039368211

ABSTRACT:
A supervisory circuit for a plurality of continuously-conductive alarm devices connected in parallel between a pair of conductors monitors the operability of the circuit as well as the operability of each of the devices. Alarm devices having a low impedance are connected between the conductors over a parallel-connected resistor and diode which unidirectionally increases the impedance of such devices. The alarm circuit is connected in one arm of a balanced bridge circuit which has a detecting circuit connected in a further branch of the bridge circuit for monitoring the impedance of the circuit and for providing a supervision signal in response to a change in the impedance of the alarm circuit indicating inoperability of a device or open or short circuit conditions for the conductors which connect the devices into the circuit.

REFERENCES:
patent: 3389390 (1968-06-01), Waller
patent: 3544984 (1970-12-01), Hanson

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