Electric lamp and discharge devices: systems – Special application – Vehicle
Patent
1989-07-03
1991-03-19
Laroche, Eugene R.
Electric lamp and discharge devices: systems
Special application
Vehicle
315 80, 315291, 315293, 315309, 330298, 340468, 340469, 307 108, H60Q 126
Patent
active
050013980
ABSTRACT:
A lamp intensity control system combines the functions of the tail light, the brake light, and the turn indicator light signals into one signal for controlling a plurality of lamps in an automobile. The tail light, brake light and turn indicator light signals are combined into one signal and modulated wherein the percent of modulation determines the intensity of the brightness of the plurality of lamps. Temperature protection is provided wherein a temperature limit circuit monitors the temperature of a SENSFET and disables the SENSFET if its temperature exceeds a predetermined magnitude. Over-current and open lamp conditions are monitored by comparator circuits. An over-current condition causes the SENSFET to be disabled. An over-temperature, over-current or open-lamp condition is signaled by a fault output signal.
REFERENCES:
patent: 1981985 (1934-11-01), Braselton
patent: 3244934 (1966-05-01), Webb
patent: 3277442 (1966-10-01), Kearny
patent: 3284770 (1966-11-01), Bleiweiss et al.
patent: 3603840 (1971-09-01), Durocher
patent: 4149124 (1979-04-01), Glogolja
patent: 4904906 (1990-02-01), Atherton et al.
Atkins Robert D.
Bingham Michael D.
Dinh Son
LaRoche Eugene R.
Motorola Inc.
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