Vehicle headlamp control circuits

Details Vehicle headlamp control circuits Vehicle headlamp control circuits

1977-02-04

1978-09-26

Yusko, Donald J.

Communications: electrical

Selective

Having indication or alarm

315 83, 315156, B60Q 114, H05B 3902

Patent

active

041174534

ABSTRACT:
An automatic vehicle headlamp intensity adjustement circuit includes a high sensor. A tuned rectifier circuit for producing a d.c. signal of magnitude dependent on the amplitude of the 50Hz (or other local supply frequency) component of the signal picked up by the sensor. A lamp current modulating circuit is controlled by this d.c. signal through the intermediary of an averaging circuit. The averaging circuit has a relatively long time constant and a timer is connected to reduce this time constant if the d.c. signal continues to fall for more than a predetermined period of time.

REFERENCES:
patent: 3283161 (1966-11-01), Ubukata et al.
patent: 3780340 (1973-12-01), Munro
patent: 3828220 (1974-08-01), Moore et al.

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