Lamp monitoring circuit

Details Lamp monitoring circuit Lamp monitoring circuit

1984-03-07

1986-02-25

Dixon, Harold

Electric lamp and discharge devices: systems

Special application

Vehicle

315 82, 315 88, 315134, 315135, H01J 160

Patent

active

045729875

ABSTRACT:
In order to provide a lamp failure warning in both illuminated and unilluminated states of the lamp, there is provided a resistance bridge circuit Rs, L, R2 and R3 which is substantially in balance if the lamp L is sound. An amplifier IC1 acts as a detection means if the bridge goes out of balance as a consequence of failure of the lamp L. In the unilluminated state a reduced current is fed to the bridge via a high value resistance R1, which is by-passed by a lamp switch SW1 if the lamp is to receive enough power to illuminate it.

REFERENCES:
patent: 2197700 (1940-04-01), MacGregor
patent: 3883777 (1975-05-01), Morita
patent: 4190830 (1980-02-01), Bell
patent: 4222047 (1980-09-01), Finnegan

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