A circuit arrangement for connecting a plurality of LED modules in parallel comprises a positive pole terminal and a negative pole terminal for connecting a driver, a positive pole terminal line for electrically connecting the positive pole terminal to the modules, a negative pole terminal line for electrically connecting the negative pole terminal to the modules, a plurality of positive pole terminal contacts for electrically connecting the positive pole terminal line to anode terminal contacts of the modules, and a plurality of negative pole terminal contacts for electrically connecting the negative pole terminal line to cathode terminal contacts of the modules.

A lighting device may include an elongated housing that defines a cavity. The lighting device may include plurality of emitter printed circuit boards configured to be received within the cavity. Each of the plurality of emitter printed circuit boards may include a plurality of emitter modules mounted thereto. Each of the plurality of emitter printed circuit boards may include a control circuit configured to control the plurality of emitter modules mounted to the respective emitter printed circuit board based on receipt of one or more messages. The lighting device may include a total internal reflection lens for each of the plurality of emitter printed circuit boards. The total internal reflection lens may be configured to diffuse light emitted by the emitter modules of the plurality of emitter printed circuit boards.

A lighting assembly that includes a heatsink housing, a plurality of light emitting diode (LED) modules, and a power supply disposed within a power supply casing, wherein the power supply is for providing power to the LED modules. Each LED module includes a plurality of LEDs and is thermally connected to the heatsink housing. The power supply casing includes a structure for cooling the power supply.

A lighting circuit turns on multiple semiconductor light sources. Multiple current sources are each coupled in series with a corresponding one from among the semiconductor light sources. A switching converter supplies a driving voltage V.sub.OUT across each of multiple series connection circuits formed of the multiple semiconductor light sources and the multiple current sources. A converter controller controls a switching transistor of the switching converter based on a relation between a voltage across one from among the multiple current sources and a reference voltage having a positive correlation with the temperature T.sub.j.

A lighting circuit turns on multiple semiconductor light sources. Multiple current sources are each coupled in series with a corresponding one from among the semiconductor light sources. A switching converter supplies a driving voltage V.sub.OUT across each of multiple series connection circuits formed of the multiple semiconductor light sources and the multiple current sources. A converter controller controls a switching transistor of the switching converter based on a relation between a voltage across one from among the multiple current sources and a reference voltage having a positive correlation with the temperature T.sub.j.

A light emitter board includes a substrate having a mount surface on which first and second light emitters are mountable, and at least one pixel unit on the mount surface, including a drive circuit and first and second drive lines. The first drive line as a primary line and the second drive line as a redundant line are connected in parallel to the drive circuit. The pixel unit includes, on the mount surface, first positive and negative electrode pads connectable to the first light emitter, and second positive and negative electrode pads to the second light emitter. The first positive or negative electrode pad is connected to the first drive line, and the second positive or negative electrode pad to the second drive line.

A minimum voltage detector circuit is disclosed. The circuit includes a plurality of LED strings each having a plurality of series-coupled LEDs. The minimum voltage detector circuit is configured to detect a minimum voltage from among the plurality of LED strings, and also to perform open/short detection among the plurality of LED strings. The minimum voltage detector circuit includes a plurality of voltage comparators and correspondingly coupled replica circuits. Each of the voltage comparators includes an amplifier having a first input coupled to a cathode of a last LED of one of the plurality of LED strings, an output, and a second input coupled to the output. Each voltage comparator further includes a replica circuit coupled to the amplifier. The replica circuit is configured to maintain an output transistor of the amplifier in an active state when the amplifier is in an unbalanced state.

A circuit arrangement comprises a first terminal for connection to a voltage source, a second terminal for connection to a first current sink and a third terminal for supplying a potential signal. A first diode string can be connected to the voltage source on the anode side and to the first current sink on the cathode side. The third terminal can be coupled to the cathode side of the first diode string by a resistor. An adjustable reference current sink is coupled to the third terminal, for generating a reference current, and comparison unit coupled to the third terminal on the input side for providing a short-circuit detection signal in dependence on a difference between the potential signal and an adjustable reference voltage. The potential signal can be supplied in dependence on a first short-circuit voltage across the first diode string and in dependence on the reference current.

An LED lighting system, an automotive lighting system and a method of detecting failure in an LED lighting system are described herein. An LED lighting system includes an LED lighting circuit and a failure detection circuit. The LED lighting circuit includes a first string of a first plurality of LEDs electrically coupled in series with a first inductor and a second string of a second plurality of LEDs electrically coupled in series with a second inductor. The first and second strings each have an equal total forward voltage. The failure detection circuit is configured to detect a failure in the LED lighting circuit based on detection of a voltage difference between the first inductor and the second inductor.

A LED controller for an LED pixel array includes a serial interface to an external data bus, along with an address generator connected to the serial interface and the LED pixel array. An image frame buffer is connected to the interface to receive image data and further connected to the address generator to receive an image frame buffer address. A command and control module is connected to the serial interface and configured to modify image frame buffer output signals. A calibration data storage module is connected to the command and control module to store calibration data related to pixel voltage response in the LED pixel array and enable modification of voltage provided by the dynamic power supply at least in part based on the image presented by the LED pixel array.