Lamp monitor with latch circuit

Details Lamp monitor with latch circuit Lamp monitor with latch circuit

1984-04-05

1985-10-29

Crosland, Donnie L.

Communications: electrical

Selective

Having indication or alarm

340 79, 340 81R, 340 52D, 340 64, 340641, 315 82, B60Q 126

Patent

active

045503036

ABSTRACT:
A lamp monitor for detecting the failure of headlamps and other lamps on an automotive vehicle includes a failure detection circuit coupled to the lamp circuit to produce an output whenever the lamp circuit is operating and a failure occurs. A latch circuit responsive to the detector output and powered from the vehicle battery latches into a failure state when a lamp failure is detected and maintains that state even though the lamp circuit or the vehicle ignition circuit is switched off. The latch output triggers an indicator circuit to reveal an indication or warning when the vehicle ignition switch is turned on even though the lamp circuit is turned off and the ignition switch has been opened subsequent to the detected failure. Upon correction of the failure, the detector resets the latch circuit when the lamp circuit is actuated to disable the display.

REFERENCES:
patent: 3421157 (1969-01-01), Atkins
patent: 3593264 (1971-07-01), Atkins
patent: 3660813 (1972-05-01), Rumpf
patent: 3688297 (1972-08-01), Barnum
patent: 3735378 (1973-05-01), McNamee
patent: 3956733 (1976-05-01), Sakurai
patent: 3975708 (1976-08-01), Lusk et al.
patent: 4173751 (1979-11-01), Bryant

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