Lamp drive circuit

Details Lamp drive circuit Lamp drive circuit

1988-01-04

1990-02-20

Goldstein, Herbert

Communications: electrical

Condition responsive indicating system

Specific condition

307 108, 340458, G08B 2100

Patent

active

049030116

ABSTRACT:
The apparatus for driving and monitoring a lamp includes a main drive circuit, a backup drive circuit, a monitoring circuit, all connected to a controller. If the controller determines that the main drive circuit cannot energize the lamp, the backup circuit is enabled to energize the lamp. For purposes of energizing the lamp, the lamp is connectable to one of two electrical ground references. If one of the ground references becomes open circuited from the remainder of the circuitry, then the lamp is energized through the other ground reference.

REFERENCES:
patent: 3883777 (1975-05-01), Morita
patent: 3944889 (1976-03-01), Conway
patent: 4099157 (1978-07-01), Enabnit
patent: 4214236 (1980-07-01), Carp et al.
patent: 4222047 (1980-09-01), Finnegan
patent: 4236146 (1980-11-01), Clark et al.
patent: 4321579 (1982-03-01), Jochmann et al.
patent: 4447806 (1984-05-01), Gundel et al.
patent: 4574266 (1986-03-01), Valentine
patent: 4682078 (1987-07-01), Pascalide
"Electronic Lamp Monitoring" SAE Spring Conference, May 22, 1972 by McNamee & Marshall.
"Outage Detection" Society of Automotive Engineers, National Automobile Engineering Meeting, Detroit, MI, May 22-26, 1972 by Scharf.

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