A lighting circuit which lights a semiconductor light source, the lighting circuit includes a drive circuit configured to receive a PWM signal from a controller, to generate a drive current to the semiconductor light source, and to switch the drive current according to the PWM signal. When a non-input state of the PWM signal exceeds a predetermined time, the lighting circuit is configured to assert an abnormality detection signal and to output the abnormality detection signal to the controller.


    Access

    Download


    Export, share and cite



    Title :

    LIGHTING CIRCUIT AND VEHICLE LAMP


    Contributors:
    MATSUI KOTARO (author) / SUGIYAMA TAKAO (author) / OGO SUSUMU (author)

    Publication date :

    2018-02-01


    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





    VEHICLE LAMP AND LIGHTING CIRCUIT

    ICHIKAWA TOMOYUKI / SUZUKI TETSUYA / OZAWA ATSUSHI et al. | European Patent Office | 2020

    Free access

    Lighting circuit and vehicle lamp

    MURAKAMI TAKUYA / YOSHIDA SHUNICHIRO | European Patent Office | 2019

    Free access

    Vehicle lamp and lighting circuit

    ICHIKAWA TOMOYUKI / ITO TORU / OZAWA ATSUSHI | European Patent Office | 2022

    Free access