A vehicle lamp driver circuit includes a first LED string and a second LED string in series with a control switch having a feedback circuit for maintaining constant current regulation to control the sum of the current in each LED string and reduce switching noise. When there is reduced input voltage, operation of the LED strings is provided by switching circuits that short-out one LED in each LED string.
Driver circuit for LED vehicle lamp
Antriebsschaltung für eine LED-Fahrzeugleuchte
Circuit de commande pour lampe de véhicule à DEL
2018-10-10
Patent
Electronic Resource
English
IPC: | H05B ELECTRIC HEATING , Elektrische Heizung / 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 / H01L Halbleiterbauelemente , SEMICONDUCTOR DEVICES |
VEHICLE LAMP, LIGHTING CIRCUIT THEREFOR, DRIVER CIRCUIT, AND DRIVER-INTEGRATED LIGHT SOURCE
European Patent Office | 2019
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