Hella Gmbh & Co Kgaa

Hella Kgaa Hueck and Company

Nietfeld, Dieter

Dieter Nietfeld

Shaham Nemati

Jacek Roslak

Bernd Schulte-Eversum

Christoph Foecking

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 lighting unit having a light-emitting diode matrix and a controllable power source, in particular for a headlight. The light-emitting diode matrix is equipped with at least one first supply connection, a number m of first switches which have a first connection that is connected to the first supply connection, at least one second supply connection, a number n of second switches which have a second connection that is connected to the second supply connection, a number of m*n inorganic light-emitting diodes, a first connection of which is connected to a second connection of one of the first switches and a second connection of which is connected to a first connection of one of the second switches.

Lighting unit, in particular headlight, comprising a light-emitting diode matrix and a controlled power source

A control and/or regulating system is provided for controlling and/or regulating an LED field with n LEDs, with outputs at which control and/or regulating signals for controlling and/or regulating controllable switching elements can be tapped. The control and/or regulating system can be used to define activation times and/or deactivation times of impulses through the control signals and/or regulating signals and one and/or several controllable switching elements can be actuated during the determined impulses for closing or opening. A number of k groups can be specified or has been specified. Each LED is allocated to one of the k groups such that each one of the k groups mcontains LEDs, where 1≤j≤k and is Σm=n and the determined activation times and/or deactivation times of the impulses of every single group has been specified by the control and/or regulating system such that the impulses overlap as little as possible.

Control and/or regulating system, circuit arrangement and procedure 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.

Method for reducing the maximum demand of the current received by an LED matrix

An arrangement including a light-emitting diode array made up of light-emitting diodes, each light-emitting diode being switchable on and off with the aid of a controllable switch, and including a current source for supplying the light-emitting diode array with current. The arrangement including an interface, to which an input signal having image information for an image, which is displayable with the aid of the light-emitting diode array, may be applied, and the interface converting the input signal into digital signals in which information is contained for switching the controllable switches on and off. The arrangement including a counter, with the aid of which it is possible to detect how many switches are closed or are to be closed within a clock pulse. The current supplied by the current source is controllable as a function of the counter reading.

Method and means for setting a current source for a light-emitting diode array

A method for adjusting a voltage supply device for a multichannel LED control and power supply device having a determination of a number of LEDs that are connected to a multichannel LED control and power supply device or are a part of this device and that are switched on and supplied with current by the multichannel LED control and power supply device at a point in time, and a setting of a voltage with which the multichannel LED control and power supply device is supplied as a function of the number of LEDs determined that are switched on and supplied with current.

Method and device for adjusting a voltage supply device for a multichannel LED control and power supply device

A light-emitting diode assembly having at least one light-emitting diode, a controller which is designed to dim the at least one light-emitting diode by means of pulse width modulation, wherein the pulse width modulation is characterized by a clock pulse and a pulse duration during a clock pulse. The controller is designed to actuate the at least one light-emitting diode with packets of at least two clock pulses. The controller being optionally designed to actuate the at least one light-emitting diode in a first operating mode and at least one second operating mode, wherein the at least one light-emitting diode is actuated in the first operating mode with the same pulse durations within the packet and is actuated in the second operating mode with at least one different pulse duration within the packet.

Light-emitting diode assembly, and method for dimming a light-emitting diode of a light-emitting diode assembly

A method for operating a circuit configuration which includes a power source, a light diode field switched serially with the power source in which the light diode field comprises at least two serial circuits including at least one light diode and a switch, a control and/or regulating means for the light diode field, and a voltage sensor. The control and/or regulation means controlling the controllable switches and the power source such that the control and/or regulation means addresses the controllable switch of at least one serial circuit of the light diode field during a clock cycle for a pulse duration determined by the control and/or regulation means using a control pulse at the control input of the controllable switch for closing. The control and/or regulation means addresses the power source shortly before or at the latest simultaneous with the end of a pulse duration such that the current is reduced, namely by the amount of current through the serial circuit. The controllable switch at the end of the pulse duration is addressed by the control and/or regulation means for opening. During subsequent clock cycles the control and/or regulation means switch on only one of the controllable switches of the serial circuits for a period identified as diagnostics period.

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Paderborn, Germany

Dieter Nietfeld