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Exercise Devices

Lamp-outage-indicator-circuit

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Lamp outage indicator circuit

Details

Inventors: Bell, Robert E.;
Assignee: Essex Group, Inc. (Fort Wayne, IN)
Primary Examiner: Caldwell, Sr.; John W.
Assistant Examiner: Myer; Daniel
Attorney, Agent or Firm: Freiburger; Lawrence E., Sommer; Robert D.

An indicator circuit for indicating whether an incandescent type lamp is burned out. The indicator circuits include a voltage reference source and an indicator LED which is normally biased just below the knee of its conduction curve, but which is biased into conduction whenever the monitored lamp burns out. A bridge circuit is utilized so that relatively small variations in power source voltage do not affect the operating point of the circuit.

DETAILED DESCRIPTION It is thus an object of the present invention to provide a lamp outage indicator for single lamps, or arrays thereof, which is particularly useful in an automobile or other vehicle.
It is a further object of the present invention to provide a lamp outage indicator which is relatively insensitive to supply voltage fluctuations.
It is still yet another object of the present invention to provide a lamp outage indicator which includes an indication that the circuit is operative in addition to the lamp outage indication.
The basic lamp outage indicator of the invention essentially includes a voltage divider network connected across a power source to provide a first reference voltage and a relatively small resistance and a lamp (or lamp array) connected in series with the power source.
An LED has one terminal connected to the reference voltage point, its second terminal connected intermediate the relatively small resistance and the lamp.
The reference voltage point is adjusted so that the LED is forward biased and that the voltage across it is below its "turn on" threshold when the lamp is not burned out.
If the lamp burns out, the voltage across the LED is increased to turn it on.

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