Abstract: A motor vehicle headlight element is specified which has at least one light-emitting diode and at least one control apparatus. The control apparatus is suitable for processing a signal which is dependent on a measurement variable and for applying a current, corresponding to the signal, to the light-emitting diode. The control apparatus and the light-emitting diode are arranged on a common mount.

Abstract: An illumination unit for vehicle headlights may include a light-emitting diode device, a housing and an assembly board on which components of an operating circuit for operating the light-emitting diode device are arranged, wherein the housing and the assembly board define an interior space, wherein the assembly board has at least one electrically conductive inner layer that is connected to a ground reference potential of the operating circuit and on its surface the assembly board has at least one electrical contact surface which is contacted with at least one electrically conductive inner layer, and the housing has an electromagnetic shielding structure configured to provide electromagnetic shielding of the interior space, wherein the electromagnetic shielding structure is connected to the at least one electrical contact surface.

Abstract: An arrangement for cooling semiconductor light sources (5), wherein the semiconductor light sources (5) are arranged on a heat-conducting module (11), which is operatively connected to an evaporator zone (27) of a heat pipe (20), wherein a first condensation zone (23) of the heat pipe (20) is connected to a first heat sink (33), wherein the heat pipe (20) is connected to at least one second condensation zone (25) with at least one second heat sink (25), and a heat flow can be switched over between the condensation zones (23, 25) or the second condensation zone (25) can be switched in.

Abstract: A semiconductor light module comprising: integrated drive electronics, a semiconductor light source applied to a disk-shaped module, the surface of which is electrically conductive, and wherein the module has good thermal conductivity. The drive electronics are positioned around the semiconductor light source, and the drive electronics comprise a circuit board having at least first and second conductor track levels. The first track level is oriented outward in the light emission direction in the installed state, and the second track level is enclosed by a closed cavity incorporated into the module. Ground-carrying lines of the circuit board are electrically connected to the surface of the module.

Abstract: A motor vehicle headlight element is specified which has at least one light-emitting diode and at least one control apparatus. The control apparatus is suitable for processing a signal which is dependent on a measurement variable and for applying a current, corresponding to the signal, to the light-emitting diode. The control apparatus and the light-emitting diode are arranged on a common mount.

Abstract: A motor vehicle headlight element is specified which has at least one light-emitting diode and at least one control apparatus. The control apparatus is suitable for processing a signal which is dependent on a measurement variable and for applying a current corresponding to the signal, to the light-emitting diode. The control apparatus and the light-emitting diode are arranged on a common mount.

Abstract: An illumination unit for vehicle headlights may include a light-emitting diode device, a housing and an assembly board on which components of an operating circuit for operating the light-emitting diode device are arranged, wherein the housing and the assembly board define an interior space, wherein the assembly board has at least one electrically conductive inner layer that is connected to a ground reference potential of the operating circuit and on its surface the assembly board has at least one electrical contact surface which is contacted with at least one electrically conductive inner layer, and the housing has an electromagnetic shielding structure configured to provide electromagnetic shielding of the interior space, wherein the electromagnetic shielding structure is connected to the at least one electrical contact surface.

Abstract: The invention relates to a circuit unit for a semiconductor unit which produces radiation, with a forward voltage Uf being applied during operation to the semiconductor unit which produces radiation, and with a forward current If flowing through the semiconductor unit which produces radiation, with the circuit unit regulating the forward current If such that an actual value Vact which depends on the forward current If and the forward voltage Uf assumes a predetermined nominal value Vnom. The invention also relates to a radiation source.

Abstract: An arrangement for cooling semiconductor light sources (5), wherein the semiconductor light sources (5) are arranged on a heat-conducting module (11), which is operatively connected to an evaporator zone (27) of a heat pipe (20), wherein a first condensation zone (23) of the heat pipe (20) is connected to a first heat sink (33), wherein the heat pipe (20) is connected to at least one second condensation zone (25) with at least one second heat sink (25), and a heat flow can be switched over between the condensation zones (23, 25) or the second condensation zone (25) can be switched in.

Abstract: A semiconductor light module comprising: integrated drive electronics, a semiconductor light source applied to a disk-shaped module, the surface of which is electrically conductive, and wherein the module has good thermal conductivity. The drive electronics are positioned around the semiconductor light source, and the drive electronics comprise a circuit board having at least first and second conductor track levels. The first track level is oriented outward in the light emission direction in the installed state, and the second track level is enclosed by a closed cavity incorporated into the module. Ground-carrying lines of the circuit board are electrically connected to the surface of the module.

Abstract: A motor vehicle headlight element is specified which has at least one light-emitting diode and at least one control apparatus. The control apparatus is suitable for processing a signal which is dependent on a measurement variable and for applying a current, corresponding to the signal, to the light-emitting diode. The control apparatus and the light-emitting diode are arranged on a common mount.

Abstract: The invention relates to a circuit unit for a semiconductor unit which produces radiation, with a forward voltage Uf being applied during operation to the semiconductor unit which produces radiation, and with a forward current If flowing through the semiconductor unit which produces radiation, with the circuit unit regulating the forward current If such that an actual value Vact which depends on the forward current If and the forward voltage Uf assumes a predetermined nominal value Vnom. The invention also relates to a radiation source.

Abstract: A color adaptive lighting system for creating a mixture of light that lies on the Planck's radiation course, includes: a housing (2; 17; 27); a first light source in the form of at least one low-pressure gas discharge lamp; a second light source in the form of at least two light-emitting diodes (LED's) (9, 10; 21, 22; 33, 34); at least one reflector (3; 17; 27) that is placed behind the low-pressure gas discharge lamp (4; 18, 28) in the direction of emission of the lighting system; optionally a diffusing disc and/or cover disc (13, 14; 19, 20), and; a ballast for operating the light sources and for controlling the intensity of the light sources. The at least two LED's (9, 10; 21, 22; 33, 34) are arranged in the lighting system in such a manner that the main direction of emission of the LED's (9, 10; 21, 22; 33, 34) points toward the reflector.

Abstract: An illumination system has at least two light sources of which at least one light source includes an LED, and a driver device designed to operate at least the one LED with a DC signal; a sensor device for determining at least one feature of the light output; an actual value storage device connected to the sensor device for storing an actual value of the feature; a setpoint selection device for storing a setpoint of the feature; and a control device connected on the input side to the actual value storage device for of transmitting the actual value, and to the setpoint selection device for transmitting the setpoint, and which provides the driver device with a control signal that changes a characteristic of the DC signal used for driving the LED such that the actual value approaches the setpoint.

Abstract: A description is given of an illumination device which emits mixed-color light containing light of at least two different color channels (R, R1, G, G1, B, B1). The illumination device contains at least one primary light source (1) of a first color, the light of which forms a first color channel (R, R1, G, G1, B, B1), and at least one primary light source (1) of a second color, the light of which forms a second color channel (R, R1, G, G1, B, B1), at least one sensor device (3), which is positioned such that it can receive mixed-color light and is suitable for detecting brightness of light of a wavelength range comprising the color channels (R, R1, G, G1, B, B1) and which determines the brightnesses of the different color channels (R, R1, G, G1, B, B1) separately and repeatedly during operation.

Abstract: Drive circuit for at least one LED strand, with a switch being arranged in series with each LED strand and with each LED strand having a supply connection via which it can be connected to a supply voltage, in which case each switch can be driven so as to allow a current to flow in the associated LED strand, having a first control loop which is designed to drive the switch of the at least one LED strand such that an adjustable mean value is achieved for the current flowing through the LED strand, with the drive circuit also having: a second control loop which is designed to provide a supply voltage for the at least one LED strand as a function of the peak value of the current flowing through the at least one LED strand.

Abstract: A description is given of an illumination device which emits mixed-color light containing light of at least two different color channels (R, R1, G, G1, B, B1). The illumination device contains at least one primary light source (1) of a first color, the light of which forms a first color channel (R, R1, G, G1, B, B1), and at least one primary light source (1) of a second color, the light of which forms a second color channel (R, R1, G, G1, B, B1), at least one sensor device (3), which is positioned such that it can receive mixed-color light and is suitable for detecting brightness of light of a wavelength range comprising the color channels (R, R1, G, G1, B, B1) and which determines the brightnesses of the different color channels (R, R1, G, G1, B, B1) separately and repeatedly during operation.

Abstract: An illumination system has at least two light sources of which at least one light source includes an LED, and a driver device designed to operate at least the one LED with a DC signal; a sensor device for determining at least one feature of the light output; an actual value storage device connected to the sensor device for storing an actual value of the feature; a setpoint selection device for storing a setpoint of the feature; and a control device connected on the input side to the actual value storage device for of transmitting the actual value, and to the setpoint selection device for transmitting the setpoint, and which provides the driver device with a control signal that changes a characteristic of the DC signal used for driving the LED such that the actual value approaches the setpoint.

Abstract: A drive circuit for an LED array comprises a first LED cluster and at least one second LED cluster. A control loop is designed to drive a switch of the first LED cluster so as to achieve a constant mean value of the current (ILED) flowing through the first LED cluster the control loop being designed for also driving switches of the further LED clusters. The drive circuit also comprises a total current detection device (RMES) with the aid of which it is possible to determine an actual magnitude (UMess) which corresponds to the sum of the currents through at least two of the second LED cluster.

Abstract: Drive circuit for at least one LED strand (D1 to D4), with a switch (T1) being arranged in series with each LED strand and with each LED strand having a supply connection via which it can be connected to a supply voltage, in which case each switch (T1) can be driven so as to allow a current to flow in the associated LED strand, having a first control loop which is designed to drive the switch (T1) of the at least one LED strand such that an adjustable mean value ({overscore (i)}LEDnom) is achieved for the current (iLED) flowing through the LED strand, with the drive circuit also having: a second control loop which is designed to provide a supply voltage (UA) for the at least one LED strand (D1 to D4) as a function of the peak value (îLED) of the current (iLED) flowing through the at least one LED strand. The present invention also relates to a corresponding method for operating at least one LED strand.