Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-11-03
1982-10-12
Brigance, Gerald L.
Communications: electrical
Condition responsive indicating system
Specific condition
340641, G08B 2100
Patent
active
043541810
ABSTRACT:
A device for indicating when one or more fluorescent lamps in a bank of fluorescent lamps burns out requiring only a single indicator is disclosed. The device includes a voltage divider connected to a terminal of each lamp to produce a signal proportional to the voltage supplied by a ballast to the terminal of the lamp. These signals are then summed at a common summing terminal. The voltage at the summing terminal is approximately equal to the largest voltage of the individual signals produced at each lamp. The signal at the summing terminal is modified, typically through an adjustable voltage divider, to produce a third signalwhich is applied to the gate of an SCR. The adjustable voltage divider is designed so that when any one of the lamps goes out producing a substantial rise in the voltage applied by the ballast to the lamp, the SCR will be triggered. An indicator bulb is connected to the anode of the SCR so that when the SCR triggers, the bulb lights indicating one or more of the lamps are burned out.
REFERENCES:
patent: 3593274 (1971-07-01), Krugler, Sr.
patent: 4260985 (1981-04-01), Hayden
Brigance Gerald L.
Gerber Products Company
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