Incandescent lamp monitoring device

Details Incandescent lamp monitoring device Incandescent lamp monitoring device

1977-12-27

1979-11-06

Yusko, Donald J.

Communications: electrical

Selective

Having indication or alarm

340510, 340642, 340661, B60Q 100, G08B 2100

Patent

active

041737504

ABSTRACT:
A monitoring device for monitoring incandescent lamps, especially in motor vehicles, is provided. A measuring resistor is connected in series with an incandescent lamp to be monitored. Means for monitoring the voltage drop at the measuring resistor are provided. The monitoring means comprises an operational amplifier to one input of which the connection between the measuring resistor and the incandescent lamp is connected and to the other input of which a voltage divider is connected which is mounted in parallel with the measuring resistor and the incandescent lamp. The voltage divider is formed of ohmic resistors, and the output of the operational amplifier controls an indicator means for generating an indication signal upon missing or excessively low voltage drop at the measuring resistor.

REFERENCES:
patent: 3593264 (1971-07-01), Atkins
patent: 3736560 (1973-05-01), Hart
patent: 3857062 (1974-12-01), Leonard et al.
patent: 3883753 (1975-05-01), Harrison, Jr. et al.
patent: 3984676 (1976-10-01), Barbieri
"Applied Ideas", Electronic Engineering, Mar. 1977, p. 27.

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