Vishay Electronic Gmbh

Mustafa Dinc

Harald Lunt

Franz X Rettenmeier

Jörg Angerstein

Norbert Pieper

A circuit for operating a light-emitting diode assembly, wherein the light-emitting diode assembly comprises a plurality of strands connected in parallel of one or more light-emitting diodes which are arranged in series and through which in the operational state a particular partial current of an operating current flowing through the light-emitting diode assembly flows, comprises a current source for providing the operating current. The circuit is designed to detect the greatest partial current and to control an operational value provided by the partial current source on the basis of said greatest partial current such that none of the partial currents exceeds a predetermined maximum current.

Circuit for operating parallel light emitting diode strings

An illumination unit for illuminating large surfaces comprises a carrier device (), to which a plurality of light emitting diodes () is fastened in a two-dimensional arrangement. A plurality of separate reflector elements () is fastened to the carrier device between the light emitting diodes.

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Heilbronn, Germany

Mustafa Dinc