Monitor system for traffic-lights

Details Monitor system for traffic-lights Monitor system for traffic-lights

1986-09-02

1989-03-07

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340931, 307 38, G08B 2100

Patent

active

048110108

ABSTRACT:
A monitor circuit arrangement for traffic lights wherein energy is supplied from an alternating voltage supply source(s) to a lamp (L 1) via a controlled switch (SD 1) and energization of the unit is monitored by a voltage comparator connected in cascade with a sensing latch (SL 1). The output of the voltage comparator is activated in response to its input voltage exceeding a predetermined magnitude of either polarity relative to a common reference voltage wave. A monitored voltage representative of the voltage present across the lamp is supplied as an input voltage to the voltage comparator, the output of which is fed to the sensing latch set input. Reset means (RPS) are provided for resetting the latch at the commencement of each cycle of the alternating supply voltage.

REFERENCES:
patent: 3648233 (1972-03-01), Clark
patent: 4091381 (1978-05-01), Huntsinger
patent: 4494010 (1985-01-01), Donnelly

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