Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1992-06-10
1994-05-24
Pascal, Robert J.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315307, 315308, 315291, 315224, H05B 3702
Patent
active
053152140
ABSTRACT:
An embodiment of the present invention is a dimmable, high power factor, high efficiency electronic ballast comprising, on a single integrated circuit chip, a shunt regulator, a voltage reference, a high-temperature shutdown, an undervoltage lockout, a timer for start-up and restarting, a variable oscillator, a mode control, an op-amp for receiving a signal proportional to lamp current and for controlling the variable oscillator or the duty-cycle of pulses output in a closed-loop servo, and active power factor correction including an analog multiplier for receiving an AC voltage and an AC current sample, and for multiplying these together to result in a comparison with a DC voltage. The comparison produces a control signal for a MOSFET switch on a boost converter transformer that actively corrects the power factor at a rate set by the oscillator.
REFERENCES:
patent: 4384213 (1983-05-01), Bogel
patent: 4415839 (1983-11-01), Lesea
patent: 4629967 (1986-12-01), Voss
patent: 4988889 (1991-01-01), Oughton, Jr.
patent: 5204587 (1993-04-01), Mortimor et al.
Metcal Inc.
Pascal Robert J.
Philogene Haissa
Schatzel Thomas E.
LandOfFree
Dimmable high power factor high-efficiency electronic ballast co does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dimmable high power factor high-efficiency electronic ballast co, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dimmable high power factor high-efficiency electronic ballast co will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1975283