Circuit for detecting end of life of fluorescent lamp

Details Circuit for detecting end of life of fluorescent lamp Circuit for detecting end of life of fluorescent lamp

2007-05-30

2009-02-03

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S291000, C315S194000, C315S308000, C315S307000, C315S2090SC

Reexamination Certificate

active

07486029

ABSTRACT:
A circuit for detecting the end of life of a fluorescent lamp is provided. In this circuit, a rectifier rectifies a voltage signal detected from a ballast. A phase detector detects the phase of the voltage signal and outputs at least one phase detection signal. A signal separator separates the rectified voltage on a phase basis to generate first and second voltage signals in response to the phase detection signal. A first maximum level detector detects the maximum level of the first voltage signal. A second maximum level detector detects the maximum level of the second voltage signal. A first comparison unit compares the first and second maximum levels and detects whether or not the difference is higher than a predetermined allowable level. A controller determines whether or not the fluorescent lamp is at the end of life in response to the detection from the first comparison unit.

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patent: 7064499 (2006-06-01), Lott
patent: 7378807 (2008-05-01), Feldtkeller et al.

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