Multiple current sources are coupled in series to corresponding light-emitting elements. Switching converter supplies driving voltage to the multiple light-emitting elements and current sources. Pulse modulator generates pulse signal that transits to on level when the smallest from among voltages across both ends of the multiple current sources falls to bottom limit voltage, and subsequently transits to off level. Frequency stabilization circuit controls pulse modulator such that the frequency of pulse signal approaches its target. Dummy load circuit is configured to lower driving voltage in the enable state, to be set to the enable state when switching transistor continues to be off for a predetermined time, and to be set to the disable state in response to the next turn-on of the switching transistor.


    Access

    Download


    Export, share and cite



    Title :

    Lighting circuit for automotive lamp


    Contributors:

    Publication date :

    2023-03-28


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    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



    LIGHTING CIRCUIT FOR AUTOMOTIVE LAMP

    ICHIKAWA TOMOYUKI | European Patent Office | 2022

    Free access

    LIGHTING CIRCUIT OF AUTOMOTIVE LAMP

    ICHIKAWA TOMOYUKI / MATSUHANA RYOSUKE / KIKUCHI SATOSHI et al. | European Patent Office | 2022

    Free access

    LIGHTING CIRCUIT OF AUTOMOTIVE LAMP

    ICHIKAWA TOMOYUKI / MATSUHANA RYOSUKE / KIKUCHI SATOSHI et al. | European Patent Office | 2022

    Free access

    Lighting circuit of automotive lamp

    ICHIKAWA TOMOYUKI / MATSUHANA RYOSUKE / KIKUCHI SATOSHI et al. | European Patent Office | 2022

    Free access

    Lighting circuit of automotive lamp

    ICHIKAWA TOMOYUKI / MATSUHANA RYOSUKE / KIKUCHI SATOSHI et al. | European Patent Office | 2023

    Free access