A dimmable LED reading light unit (8), in particular for a passenger transportation vehicle, such as an airplane, a bus or a ship, comprises an input (10) which is connectable to a potentiometer (6) that outputs a direct voltage having a voltage intensity corresponding to a selected potentiometer position; a load current source (12) being configured to generate a predetermined load current; a current controller (16) providing an operating current for operating at least one LED (18); and an electronic measuring and control unit (14); wherein the load current source (12) and the current controller (16) are connected to the input (10) in parallel; wherein the electronic measuring and control unit (14) is configured to measure the voltage when no load current is generated by the load current source (12); to drive the load current source (12) to generate a predetermined load current and to measure the voltage when the predetermined load current is generated; to determine the position of the potentiometer (6), based on the measured voltages, based on the load current, and based on a predetermined nominal resistance value of the potentiometer (6); and to control the current controller (16) to supply driving current to the at least one LED (18) necessary to emit light with a luminous flux corresponding to the position of the potentiometer (6).


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    Title :

    Dimmable LED reading light unit, arrangement of power supply and dimmable LED reading light unit, method of operating a dimmable LED reading light unit in a power supply system, and method of replacing a dimmable light unit by a dimmable LED reading light unit


    Additional title:

    Dimmbare LED-Leselichteinheit, Anordnung aus Stromversorgung und dimmbarer LED-Leselichteinheit sowie Verfahren zum Ersetzen einer dimmbaren Leseinheit durch eine dimmbare LED-Leselichteinheit
    Unité de lumière de lecture DEL à intensité réglable, agencement d'alimentation et unité de lumière de lecture DEL à intensité réglable, procédé de fonctionnement d'une unité de lumière de lecture DEL à intensité réglable dans un système d'alimentation électrique et procédé de remplacement d'une unité de lumière à intensité réglable par une unité de lumière de lecture DEL à intensité réglable


    Contributors:

    Publication date :

    2015-09-23


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein / H05B ELECTRIC HEATING , Elektrische Heizung