Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1996-04-08
1998-09-08
Pascal, Robert
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315307, 315DIG7, 315DIG4, 315208, H05B 3702
Patent
active
058049266
ABSTRACT:
A gas discharge lamp electronic ballast circuit including a gas discharge lamp (51); a rectifier circuit (11a, 11b, 11c, 11d, 13) responsive to AC power for providing a full wave rectified sinewave voltage across output terminals of the rectifier circuit; a transformer (T1) having a primary winding and a secondary winding; a switching circuit (29) for repetitively connecting the rectifying circuit full wave rectified sinewave voltage to the primary winding; a driving circuit (33, 35, 37, T2, 49) responsive to the secondary winding for driving the lamp with a sinusoidal voltage having a predetermined frequency; a current sensing circuit (39, 41, 45, 47, 43) for sensing an average of peaks of current flowing in the driving circuit; and a pulse width modulation circuit (25) responsive to the full wave rectified sinewave voltage and the current sensing means for pulse width modulating the switching circuit at the predetermined frequency such that the rectifier circuit provides a current having a flattened full wave rectified sinewave waveform.
REFERENCES:
patent: 4251752 (1981-02-01), Stolz
patent: 4277728 (1981-07-01), Stevens
Alkov Leonard A.
Lenzen, Jr. Glenn H.
Pascal Robert
Raytheon Company
Shingleton Michael
LandOfFree
Lighting circuit that includes a comparison of a "flattened" sin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lighting circuit that includes a comparison of a "flattened" sin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lighting circuit that includes a comparison of a "flattened" sin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1284599