Ballast circuit for starting fluorescent lamps

Details Ballast circuit for starting fluorescent lamps Ballast circuit for starting fluorescent lamps

1988-09-06

1990-02-13

Mis, David

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Discharge device and/or rectifier in the cathode or heater...

315 97, 315106, 315DIG2, H05B 4114, H05B 4136

Patent

active

049009869

ABSTRACT:
An improved ballast circuit for fluorescent lamps includes an electronic bilateral triggering device and a capacitor connected in series combination across the secondary winding output terminals of a ballasting transformer and in shunt with the fluorescent lamps. The triggering device and the capacitor operate to produce high frequency oscillations superimposed on the high AC voltage applied across the lamp cathodes to improve the capacitive coupling between the lamps and their mounting fixture during starting. The triggering device becomes nonconductive to effectively remove itself and the capacitor from the starting circuit while the lamps are lit.

REFERENCES:
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patent: 3631317 (1971-12-01), Miyajima
patent: 3644780 (1972-02-01), Koyama et al.
patent: 3665243 (1972-05-01), Kaneda et al.
patent: 3701925 (1972-10-01), Nozawa et al.
patent: 3866088 (1975-02-01), Kaneda et al.
patent: 3875459 (1975-04-01), Remery et al.
patent: 4210850 (1980-07-01), Britton
patent: 4238708 (1980-12-01), Kaneda
patent: 4323824 (1982-04-01), Roche et al.
patent: 4460848 (1984-07-01), Fahnrich
patent: 4649319 (1987-03-01), Shurgan

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