Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 8, 2011
Patent Application Number
11913368
Date Filed
May 4, 2005
Patent Primary Examiner
Patent abstract
A driving method for a discharge lamp having two cathodes includes providing a supply input voltage for providing an alternating voltage at the terminals of the cathodes, monitoring a condition of each of the cathodes and measuring a first direct voltage signal of the waveform of the voltage of the lamp that develops when the lamp approaches an ageing condition, deactivating the alternating voltage when a variation of the first direct voltage signal occurs, and supplying a second direct voltage signal proportional to the supply input voltage for deactivating the alternating voltage when a variation of the first direct voltage signal occurs in relation to the second direct voltage signal.
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