Hella Gmbh & Co Kgaa

Shaham Nemati

Dieter Nietfeld

Jacek Roslak

Bernd Schulte-Eversum

A method is provided for operating a control and/or regulating system for a light emitting diode field. At least two first outputs are provided at which control signals for controlling controllable switch elements of the light emitting diode field are tapped. A second output is provided at which control and/or regulating signals for controlling and/or regulating a controllable and/or regulatable power source is tapped. The voltage drop across the light emitting diode field is measured by the first voltage sensor, and when the control and/or regulating signal of the control and/or regulating system falls below a designated voltage value, the controllable and/or regulatable power source is switched off. A constant sensor signal is present at the at least one measuring signal input, and the sensor signal is larger than the designated voltage value.

Control and/or regulating system, circuit arrangement and method for actuating light-emitting diodes (LEDs) in an LED field

A method for reducing the maximum demand of the current received by an LED matrix from a current source. Each LED of the LED matrix receiving a pulse width-modulated current from the current source, an activation period being assigned to each LED in an elementary period of the pulse width-modulated current, and/or a deactivation period is assigned, in which no current flows through the LED, the activation period and the deactivation period being able to be equal in length or shorter than the elementary period, and in the case that the activation period assigned to one of the LEDs and the deactivation period assigned to this LED are shorter than an elementary period, the activation period begins at an activation point in time and ends at a deactivation point in time, and the deactivation period begins at the deactivation point in time and ends at the activation point in time.

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Dortmund, Germany

Shaham Nemati