The drive circuit receives an input voltage, and to supply a drive current ILED stabilized to a target amount IREF to the semiconductor light source. A plurality of bypass switches is respectively connected in parallel to a corresponding part of the plurality of light-emitting elements. The bypass control unit generates phase-shifted gate pulse signals, and controls the bypass switches in correspondence to the gate pulse signals. The bypass control unit changes a duty ratio of each gate pulse signal in correspondence to a target luminance of a corresponding part, and corrects the duty ratio of each gate pulse signal based on the input voltage.
LIGHTING CIRCUIT AND VEHICLE LAMP
2020-06-11
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 |
European Patent Office | 2016
|European Patent Office | 2016
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