Apparatus for end-of-life detection of fluorescent lamps

Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation

Reexamination Certificate

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Details

C315S276000, C315S291000

Reexamination Certificate

active

07368883

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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