Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1998-12-01
2000-08-22
Philogene, Haissa
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315209R, 315287, 315DIG4, 315DIG7, 363 37, H05B 3702
Patent
active
061077518
ABSTRACT:
A circuit for supplying AC voltage and current to a gaseous discharge lamp upon the application of DC voltage and current, the circuit comprising: a transformer including a first and a second primary windings; a first capacitance means, coupled across the primary windings to define a resonant circuit; a start-up current source coupled to a drive terminal; first and second transistors coupled to the drive terminal; at least one drive winding coupled on one end to the drive terminal and coupled on the other end to the base of one of the transistors; and first and second current-blocking devices, in one embodiment a diode and in another embodiment a transistor, each current-blocking device configured so as to block a current from flowing into the emitter element of one of the transistors. Additionally, the circuit comprises a means for establishing a constant current flow between the base terminals of the transistors, sufficient to maintain the circuit in an oscillating mode, the means having a linear inductor, a resistor and at least one diode. In another embodiment, the circuit has one drive winding coupled to the base element of the first transistor switching means, and a parallel combination of a second capacitance means and a second resistor means coupled to the base element of the second transistor switching means.
REFERENCES:
patent: 4277726 (1981-07-01), Burke
patent: 4684850 (1987-08-01), Stevens
patent: 5144205 (1992-09-01), Motto et al.
patent: 5192896 (1993-03-01), Qin
LandOfFree
Current fed, parallel resonant 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 Current fed, parallel resonant ballast, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current fed, parallel resonant ballast will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-584675