Circuit, having multiple series resonant paths, for lighting a b

Details Circuit, having multiple series resonant paths, for lighting a b Circuit, having multiple series resonant paths, for lighting a b

1993-04-21

1994-08-16

Pascal, Robert J.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

315216, 315226, 315241R, 315242, 315106, 315107, H05B 3900

Patent

active

053381106

ABSTRACT:
A circuit for lighting a fluorescent lamp. The present invention takes into account the fastidious characteristics of the fluorescent lamp, and during the momentary lighting of the fluorescent lamp. In order to reduce the temperature fluctuations, a separate pre-heating power is supplied. The circuit includes: a first resonance circuit consisting of a first capacitor connected to the opposite ends of the fluorescent lamp, a resonance inductor, a second capacitor, a first switch and a DC power source, serially connected; a second resonance circuit consisting of a second switch, a first capacitor, a resonance inductor, a third capacitor and a DC power source, serially connected; a switch control circuit for activating the first and second switches in an alternate manner. Before the lighting of the fluorescent lamp, the first and second resonance circuits are put to a resonance state, while, after the lighting of the fluorescent lamp, the resonance is eliminated.

REFERENCES:
patent: 4346297 (1982-08-01), Suzuki et al.
patent: 4763239 (1988-08-01), Ball
patent: 5250877 (1993-10-01), Fischer
patent: 5251119 (1993-10-01), MacHara

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