Lighting system and method for testing whether at least two gas discharge lamps to be operated with a ballast are of the same type

The method involves directly or indirectly measuring a coil voltage and a coil current of heating coils (W1b, W2b) of gas-discharge lamps (L1, L2) at a time period. Coil resistances of the heating coils are measured from the measured values of the coil voltage and the coil current of the heating coi...

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Bibliographic Details
Main Authors FLAX, DIRK, HOEGL, ANDREAS, MITTERBACHER, ANDRE
Format Patent
LanguageEnglish
French
German
Published 05.02.2014
Subjects
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
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Summary:The method involves directly or indirectly measuring a coil voltage and a coil current of heating coils (W1b, W2b) of gas-discharge lamps (L1, L2) at a time period. Coil resistances of the heating coils are measured from the measured values of the coil voltage and the coil current of the heating coils of the gas-discharge lamps. An absolute differential resistance from the coil resistances is smaller than a high reference value. The gas-discharge lamps are determined as not same-type, when the absolute differential resistance lies between the high reference value and a low reference value. Independent claims are also included for the following: (1) a circuit e.g. integrated circuit, for implementing a method for testing whether two gas-discharge lamps are of same-type (2) an electronic ballast comprising a unit for generating a constant coil voltage.
Bibliography:Application Number: EP20110164424