Power supply apparatus for fluorescent lamp

Details Power supply apparatus for fluorescent lamp Power supply apparatus for fluorescent lamp

1984-03-22

1985-10-01

Dixon, Harold

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315223, 315224, 315244, 315245, 315289, 315DIG7, H05B 3702

Patent

active

045448639

ABSTRACT:
A power supply apparatus for a fluorescent lamp comprises an inverter circuit for converting AC line power to a high-frequency drive voltage having a square waveform, this high-frequency drive voltage being applied to a fluorescent lamp through an inductor and a capacitor connected in series to form a series-resonance circuit which provides a ballast impedance after ignition of the fluorescent lamp has been achieved. A sufficiently high voltage to ensure reliable ignition of the fluorescent lamp is ensured by a ringing oscillation which is produced across another capacitor, connected across the lamp, when the fluorescent lamp is in the high-impedance state prior to ignition.

REFERENCES:
patent: 3084283 (1963-04-01), Grunwaldt
patent: 3644780 (1972-02-01), Koyama et al.
patent: 4053813 (1977-10-01), Kornrumpf
patent: 4207497 (1980-06-01), Capewell
patent: 4259614 (1981-03-01), Kohler

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