Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1981-11-23
1983-11-15
Dixon, Harold A.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315209R, 315216, 315247, 315287, G05F 100, H05B 3702
Patent
active
044158394
ABSTRACT:
An electronic ballast for energizing one or more gaseous-discharge lamps and for regulating the power consumed thereby, the ballast including a power supply for providing a source of DC power between a pair of outputs, a pair of transistors connected as switches in series between the power-supply outputs, the transistors for selectively coupling to the juncture thereof positive and negative potentials, a voltage-conditioning and current-limiting network for energizing the lamp from the potential developed between the transistor juncture and a power-supply common, and a pulse generator for developing pulses for driving each of the transistors in turn whereby a potential is developed at the transistor juncture which alternates as positive-going and negative-going pulses each separated by a dead time, the pulse generator for monitoring the power consumption level of the lamp and responsive thereto operative to vary the frequency and/or the width of the transistor driving pulses whereby the lamp consumption is regulated. Also included is a third harmonic trap for coupling the power supply to the AC power line to improve the power factor.
REFERENCES:
patent: 3541421 (1970-11-01), Buchman
patent: 3753071 (1973-08-01), Engel et al.
patent: 3890537 (1975-06-01), Park
patent: 4042856 (1977-08-01), Steigerwald
patent: 4127795 (1978-11-01), Knoll
patent: 4170747 (1979-10-01), Holmes
patent: 4251752 (1981-02-01), Stolz
patent: 4277728 (1981-07-01), Stevens
Dixon Harold A.
Schatzel Thomas E.
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