Ams Ag

Werner Schögler

Manfred Pauritsch

Stefan Wiegele

A driver assembly () for a lighting unit () comprises a control unit (). The lighting unit () comprises a plurality of strands (), wherein each strand comprises a series circuit () of light-emitting diodes and a current source () with a first and a second terminal (), and wherein the series circuit () of diodes is connected between a supply voltage input () of the lighting unit () and the first terminal of the current source () and the second terminal () of the current source is connected to a reference potential terminal via a resistor (). The control unit () is designed for generating a corresponding control signal for a voltage converter () from a respectively adjusted control value, wherein said voltage converter is designed for making available an output voltage at the supply voltage input () of the lighting unit () based on the control signal, for acquiring a measured value at each of the second terminals () of the current sources (), for storing an adjusted control value for each strand () based on the acquired measured values and for detecting whether an error condition exists in one of the strands () based on the stored control values.

Driver assembly and method for detecting an error condition of a lighting unit

An electronic circuit () to monitor a temperature of a light emitting diode () comprises a current generating circuit () to generate a current flow of at least a first and second current (IC, IC) through the light emitting diode () and a voltage monitoring circuit () to monitor a voltage of the light emitting diode (). The voltage monitoring circuit () is further arranged to determine a difference of a respective value of a first and second voltage (Vf, Vf) of the light emitting diode () to monitor the temperature of the light emitting diode (), wherein the first voltage (Vf) and second voltage (Vf) of the light emitting diode () is determined while driving the first and second current (IC) through the light emitting diode ().

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Graz, Austria

Werner Schögler