Method for operating a fluorescent lamp that is connected to...

Details Method for operating a fluorescent lamp that is connected to... Method for operating a fluorescent lamp that is connected to...

2011-08-02

2011-08-02

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S224000, C315S2090SC, C315S247000

Reexamination Certificate

active

07990073

ABSTRACT:
A method for operating a fluorescent lamp which is connected to a series resonant circuit with a resonant circuit inductance and a resonant circuit capacitance. The method includes applying an excitation AC voltage at an excitation frequency to the series resonant circuit using a half bridge circuit, which has an output to which the series resonant circuit is coupled, and which has a first and a second switch which are alternately switched on and off on the basis of a frequency signal. A current flowing through the resonant circuit is monitored for the presence of a critical operating state. The switched-on times of the first and second switches are shortened in comparison to switched-on times which are predetermined by the frequency signal, upon detection of a critical operating state.

REFERENCES:
patent: 6525492 (2003-02-01), Ribarich
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patent: 1333707 (2003-08-01), None
patent: 1337133 (2003-08-01), None
Infineon Technologies AG, Smart Ballast Control IC for Fluorescent Lamp Ballasts, Preliminary Datasheet Version 1.5, Jun. 2005, 38 pages.

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