Lamp ballast with near unity power factor and low harmonic conte

Details Lamp ballast with near unity power factor and low harmonic conte Lamp ballast with near unity power factor and low harmonic conte

1983-08-12

1985-08-27

Dixon, Harold

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315223, 315278, H05B 3702

Patent

active

045380945

ABSTRACT:
A magnetic ballast circuit for a fluorescent lamp providing improved power factor, reduced harmonic content and increased efficiency. A ballast circuit with three inductances connected to a junction, preferably with the first and second inductances comprising a tapped autotransformer, with the third inductance connected between a line terminal and the tap, with the first inductance connected in series with a capacitance to the other line terminal, and with the second inductance connected to the load. The first inductance may be provided totally as part of the autotransformer, or may be supplemented with a second inductance in series. In an alternative embodiment, separate inductances may be utilized.

REFERENCES:
patent: 2025471 (1935-12-01), Osborne
patent: 2928990 (1960-03-01), Siljeholm et al.
patent: 3781595 (1973-12-01), Samuels
patent: 4045711 (1977-08-01), Pitel
patent: 4105931 (1978-08-01), Prichard et al.

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