Electric lamp and discharge devices: systems – Condenser in the supply circuit – Inductance in the condenser circuit
Patent
1984-03-28
1987-03-31
Moore, David K.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Inductance in the condenser circuit
315258, 315283, 336160, 336165, 336178, 336234, H05B 4114, H01F 2726
Patent
active
046545638
ABSTRACT:
A circuit containing a ballast for one or more fluorescent lamps. The circuit includes a first inductor in series with a voltage input terminal and a first capacitor to form a series resonant circuit to provide a starting voltage to the lamps. A second, shunt inductors coupled between the first inductor and the capacitor and another input terminal of the circuit to eliminate the high Q of the series resonant circuit and prevent the first inductor from saturating. The inductors are mounted on the legs of an H-shaped core to provide inductive coupling between the inductors and allow a maximum winding area for the first inductor to reduce the series resistance of the lamp current path. The core also allows the shunt inductor to adjust power line power factor independently of lamp power factor. Improvements in system efficiency of up to 15% can be achieved over conventional core/coil type ballasts. An optional circuit portion can be added to the main circuit to turn off the starting circuit when the fluorescent lamps are lit.
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Energy Technologies Corp.
Moore David K.
Razavi M.
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