Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1997-04-10
2000-02-01
Le, Hoanganh
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315307, 315324, H05B 3702
Patent
active
060206896
ABSTRACT:
A fluorescent lamp ballast having an integrated circuit driver which avoids lamp flicker caused by momentary dips in mains voltage during lamp turn on. The anti-flicker scheme within the fluorescent lamp ballast driver distinguishes between operating conditions during and after preheat of the lamp electrodes. By maintaining the voltage for powering the integrated circuit driver above its minimum threshold, the driver does not momentarily shut off during lamp turn on.
REFERENCES:
patent: 5696431 (1997-12-01), Giannopoulos et al.
patent: 5796216 (1998-08-01), Beasley
patent: 5798620 (1998-08-01), Wacyk et al.
patent: 5834906 (1998-11-01), Chou et al.
patent: 5872429 (1999-02-01), Xia et al.
Gradzki Pawel M.
Wacyk Ihor T.
Blocker Edward
Franzblau Bernard
Le Hoang-anh
Lee Wilson
Philips Electronics North America Corporation
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