Control apparatus of fluorescent lamp

Details Control apparatus of fluorescent lamp Control apparatus of fluorescent lamp

1995-01-25

1996-06-11

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315DIG5, 315307, 315127, 315225, H05B 3702

Patent

active

055258700

ABSTRACT:
A control apparatus for a fluorescent lamp for detecting an end-of-life state of a fluorescent lamp for making it possible to take suitable countermeasures. In the control apparatus, a load circuit is formed of a capacitor connected between filaments of a fluorescent lamp and a choke coil connected in series with the filament, and there are provided a detection coil for detecting a tube current flowing through the load circuit and a detection circuit receiving an output voltage of a rectifier circuit rectifying the output of the detection coil for detecting a rise in the output voltage occurring when the output frequency of an oscillation circuit is modulated by a modulation circuit.

REFERENCES:
patent: 4060752 (1977-11-01), Walker
patent: 4251752 (1981-02-01), Stolz
patent: 4873471 (1989-10-01), Dean et al.
patent: 4952849 (1990-08-01), Fellows et al.
patent: 5015919 (1991-05-01), Vila-Mosot et al.
patent: 5097181 (1992-03-01), Kakitani
patent: 5142202 (1992-08-01), Sun et al.

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