Arrangement in connection with a coupling device of a fluorescent lamp
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United States of America Patent
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Jul 11, 2006
Grant Date -
Jun 30, 2005
app pub date -
Dec 17, 2004
filing date -
Dec 19, 2003
priority date (Note) -
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Abstract
An arrangement in connection with a coupling device of a fluorescent lamp, the coupling device comprising a supply transformer, whose secondary is coupled in parallel with a fluorescent tube, the arrangement comprising an indicator circuit configured to indicate the working condition of the fluorescent lamp. The arrangement comprises a signal transformer comprising a first primary coil, to which an alternating voltage signal supply is coupled, a secondary coil, coupled as part of a current path generated by cathodes of the fluorescent lamp and a secondary of the supply transformer and configured to supply alternating current to said current path, the indicator circuit comprising transformer members configured to generate a signal responsive to the alternating current of the current circuit.
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