A lighting circuit applied to a vehicle lighting tool includes: a power supply line to which power supply voltage is supplied in a first period of time out of a predetermined cycle including the first period of time and a second period of time, the supply of the power supply voltage being stopped in the second period of time; a regulator that supplies driving current to a light source based on the power supply voltage across the power supply line; a detection circuit that detects whether there is an abnormality in the light source; a signal output circuit that operates based on the power supply voltage across the power supply line and outputs a signal according to a detection result of the detection circuit; and a control circuit that stops an operation of the regulator when the signal indicating that there is an abnormality in the light source is output.
LIGHTING CIRCUIT AND VEHICLE LIGHTING TOOL
2025-02-13
Patent
Electronic Resource
English
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 |
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