Electric lamp and discharge devices: systems – Condenser in the supply circuit – Electric switch in the condenser circuit
Patent
1982-11-29
1984-10-09
Dixon, Harold
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Electric switch in the condenser circuit
315DIG7, H05B 3700
Patent
active
044764146
ABSTRACT:
The specification discloses a capacitive ballast for operating a gas discharge lamp from a conventional low frequency power source. The effective restart voltage during each cycle is enhanced by a trigger capacitor or pulse transformer which functions to produce a short duration reignition current. Properly timed, the reduced lamp voltage caused by the injection of the reignition current will be approximately equal to the difference between the instantaneous potential of the power source at the time of reignition and the instantaneous magnitude of the voltage across the ballast capacitor. The proper magnitude of lamp current is thus re-established during each half cycle and thereafter sustained at a value which equals the rate of change of voltage across the ballast capacitor.
REFERENCES:
patent: 4337412 (1982-06-01), Johnson
patent: 4358712 (1982-11-01), Filgas et al.
LandOfFree
Capacitor 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 Capacitor ballast, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Capacitor ballast will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1603343