Ams Ag

Stefan Wiegele

Peter Trattler

Manfred Pauritsch

Helmut Theiler

Thomas Jessenig

Werner Schögler

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

A voltage supply arrangement for driving an electrical load, particularly a light-emitting diode, comprises a driver circuit (). The driver circuit () features a driver output () for making available a driver signal (SB) for controlling a load path () that comprises a means () for connecting the electrical load (). The driver circuit () furthermore comprises a device () for determining an AC signal component of the driver signal (SB), the input side of which is coupled to the driver output () and at the output side of which can be tapped a measurement signal (SI) that is dependent on the AC signal component of the driver signal (SB) and according to which a supply voltage (VOUT) of the load path () can be adjusted.

Voltage supply arrangement and method for supplying voltage to an electrical load with transistor saturation control

In one embodiment, a DC converter has a frequency adjusting device with a frequency selection circuit, a frequency change-over switch (), a frequency generator (), a threshold signal generator (), a state machine () and a unit () for providing a ready signal (S). The frequency selection circuit has an output (), at which a control signal (S) is provided, which is set up to select a frequency of the switching frequency signal (DCLK) of the DC converter. The invention further relates to a method for selecting a frequency of the DC converter.

DC converter and method for selecting a frequency of same

A current source (), comprising a bipolar transistor () including a control terminal and a controlled path, a first terminal on the controlled path, to which first terminal an electrical load (D, D) may be connected, a second terminal on the controlled path, which second terminal may be connected to a reference potential via a resistor (), a measuring device () coupled to the control terminal for measuring a control current on the control terminal, a compensation device () coupled to the measuring device () and the bipolar transistor () in such a manner that the control current of the bipolar transistor () is compensated for at the first terminal of the controlled path.

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Graz, Austria

Stefan Wiegele