Apparatus for end-of-life detection of fluorescent lamps

Details Apparatus for end-of-life detection of fluorescent lamps Apparatus for end-of-life detection of fluorescent lamps

2008-05-06

2008-05-06

Tran, Thuy V. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S276000, C315S291000

Reexamination Certificate

active

11402126

ABSTRACT:
In fluorescent lamp lighting, it is required that when the lamp reaches its end of life there has to be some mechanism to shut down the power supply to the lamp for safety. In the present invention, an apparatus is proposed to fulfill this requirement. This invention comprises of a lamp, means to sense currents at the lamp filaments and the imbalance of the currents is detected and turn off the power source to the lamp. Several embodiments are included to illustrate the execution of this invention.

REFERENCES:
patent: 5237243 (1993-08-01), Chung
patent: 5398181 (1995-03-01), Yeh
patent: 6057652 (2000-05-01), Chen et al.
patent: 2003/0107332 (2003-06-01), Newman et al.

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