Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1984-07-09
1987-06-09
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363126, 323208, 315244, H02M 112
Patent
active
046725229
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: 1860102 (1932-03-01), Kouyoumjian
patent: 3010064 (1961-11-01), Ross
patent: 3818268 (1974-06-01), Peltz
patent: 3986076 (1976-10-01), Rottier
patent: 4222096 (1980-09-01), Cadewell
patent: 4376911 (1983-03-01), Kaneda
Schatzel Thomas E.
Wong Peter S.
XO Industries, Inc.
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