Electric lamp and discharge devices: systems – Time-controlled
Reexamination Certificate
2011-03-29
2011-03-29
Philogene, Haissa (Department: 2821)
Electric lamp and discharge devices: systems
Time-controlled
C315S169300, C315S291000, C315S307000, C345S077000, C345S076000, C345S212000
Reexamination Certificate
active
07915839
ABSTRACT:
The invention relates to a method for compensating the ageing-related loss of luminosity of an electroluminescence element, according to which the cumulative electrical energy supply, i.e. the integral of the supplied electrical power over the period of operation, is used as a criteria for the compensating regulation of the operating voltage. The processing unit continuously integrates the supplied electrical power over time. The relation between the operating voltage and the emission luminosity of the electroluminescence element is stored in the memory for different cumulative electrical energy supplies. The stored data can be defined by means of a model or estimated on the basis of empirical values. The relation can be stored in the form of values stored in a tabular manner or as an analytical function in the memory. The processing unit determines the associated effective operating voltage Ui for the luminosity nominal value B and the cumulative energy supply /Pi dt, and adjusts the voltage supply to the value by means of a control signal emitted from the signal output.
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Collard & Roe P.C.
Philogene Haissa
Schreiner Group GmbH & Co. KG
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