Control circuit of electronic ballast for fluorescent lamp

Details Control circuit of electronic ballast for fluorescent lamp Control circuit of electronic ballast for fluorescent lamp

2006-02-14

2006-02-14

Lee, Wilson (Department: 2821)

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

C315S127000, C315S225000, C315SDIG002

Reexamination Certificate

active

06998786

ABSTRACT:
Disclosed is a control circuit of an electronic ballast for a fluorescent lamp, wherein the control circuit comprises a protection circuit and an automatic re-lamp circuit. The protection circuit detects an abnormal voltage condition resulted from a defective lamp tube, stops an oscillation circuit of the electronic ballast from generating high voltage output, and thereby protects a worker from an electric shock when the worker attempts to replace the defective lamp tube. The automatic re-lamp circuit turns on a newly installed lamp tube without switching off and on a power supply to the fluorescent lamp first.

REFERENCES:
patent: 5574335 (1996-11-01), Sun
patent: 5635799 (1997-06-01), Hesterman
patent: 6222322 (2001-04-01), Stack
patent: 6501225 (2002-12-01), Konopka
patent: 6781326 (2004-08-01), Stack
Michael Bairanzade, Efficient Safety Circuit For Electronic Ballast, Motorola Inc., Mar. 1998.

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