High frequency gas discharge lamp dimming ballast

Details High frequency gas discharge lamp dimming ballast High frequency gas discharge lamp dimming ballast

1987-05-04

1990-01-16

Boudreau, Leo H.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

315DIG4, 315DIG5, 315219, 315224, H05B 3702

Patent

active

048945870

ABSTRACT:
A high frequency dimming ballast dims to about 1 percent of rated output in a repeatable way so that parallel connected dimming ballasts will all produce the same light illumination when dimmed to a very low percentage of their rated light output. A first current sensor is connected in series with a semiconductor power switching device which is coupled to and controls power to the ballast. A second current sensor is connected directly to the lamp circuit to detect actual lamp current, particularly at low illumination conditions, for example at less than 10 percent of the rated light output. Lamp control under low illumination conditions is derived from the lamp current sensor and overrides control by the sensor in series with the transistor switch means.

REFERENCES:
patent: 3265930 (1966-08-01), Powell, Jr.
patent: 3906302 (1975-09-01), Wijsboom
patent: 4129805 (1978-12-01), Sherman
patent: 4253046 (1981-02-01), Gerhard et al.
patent: 4348615 (1982-09-01), Garrison et al.
patent: 4385262 (1983-05-01), Cambier et al.
patent: 4559478 (1985-12-01), Fuller et al.
patent: 4663570 (1987-05-01), Luchaco et al.
patent: 4695770 (1987-09-01), Raets

Affiliated with

Also associated with

Rating

High frequency gas discharge lamp dimming ballast does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High frequency gas discharge lamp dimming ballast, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High frequency gas discharge lamp dimming ballast will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1336996