Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1995-09-13
1997-03-18
Pascal, Robert
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315291, 315307, 315209R, 315DIG5, 315DIG7, H05B 3702
Patent
active
056125941
ABSTRACT:
A dimmable fluorescent lamp system comprises a fluorescent lamp with filaments at each end that are continuously heated by a transformer. A resonating capacitor is connected in series with a resonating inductor and a pair of DC blocking capacitors are connected from each end of the fluorescent lamp to put it in parallel with the resonating capacitor. A control logic drives the resonating inductor with a pulse-width modulated square wave that is controlled by a feedback voltage derived from a pair of rectifiers and a dropping resistor in series with one of the DC blocking capacitors. An error amplifier with two gain settings, e.g., one for a range of 0-20% of maximum light dimming and the other for 20%-100% dimming, compares the feedback voltage to a setpoint. A threshold comparator establishes the switchover point between the two error gain ranges.
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A. Okude, "Development of an Elecytronic Dimming Ballast . . . ", Journal of Ill. Eng. Soc., Winter 1992.
C-P-M Lighting, Inc.
Pascal Robert
Philogene Haissa
Schatzel Thomas E.
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