A lighting circuit 400 drives a light source 310 including N (N represents an integer of 2 or more) multiple light-emitting elements 312 coupled in series. A bypass switch circuit 450 includes N multiple bypass switches 452, each coupled in parallel to a corresponding light-emitting element 312. A constant current driving circuit 440 supplies a driving current stabilized to a target current to the light source 310. A light distribution controller 470 controls the bypass switch circuit 450. For a given light distribution pattern, the duty ratio D(%) is determined for each of the N multiple light-emitting elements. Multiple light-emitting elements are formed as control units having a sum total of duty ratios that is less than 100%. The light distribution controller 470 controls the multiple bypass switches 452 such that the multiple light-emitting elements included in the same control unit are not turned on at the same time.
LIGHTING CIRCUIT, VEHICLE LAMP, AND DRIVING METHOD FOR LIGHT SOURCE
BELEUCHTUNGSSCHALTUNG, FAHRZEUGLAMPE UND VERFAHREN ZUR ANSTEUERUNG EINER LICHTQUELLE
CIRCUIT D'ÉCLAIRAGE, LAMPE DE VÉHICULE ET PROCÉDÉ DE COMMANDE DE SOURCE DE LUMIÈRE
2020-03-25
Patent
Elektronische Ressource
Englisch
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 / F21S Ortsfeste Leuchten , NON-PORTABLE LIGHTING DEVICES |
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