PROBLEM TO BE SOLVED: To prevent an overcurrent from flowing through a light-emitting element not bypassed, when bypassing the drive current for some light-emitting elements of a light source unit.SOLUTION: A lighting circuit includes a voltage conversion unit performing voltage conversion by receiving a DC voltage, and supplying a drive current to a light source unit, and having a smoothing capacitor for smoothing the voltage at the output stage, and a bypass switch for connecting and disconnecting a by-path for bypassing the drive current for some light-emitting elements of the light source unit connected with a plurality of light-emitting elements in series. The by-path includes a resistance component connected in series with the bypass switch.SELECTED DRAWING: Figure 1

    【課題】光源部の一部の発光素子に対して駆動電流をバイパスさせるときに、バイパスされない発光素子に過電流が流れることが生じないようにする。【解決手段】直流電圧を受けて電圧変換を行い、光源部に駆動電流を供給するとともに、出力段に電圧を平滑する平滑コンデンサを有する電圧変換部と、複数の発光素子が直列接続された光源部の一部の発光素子に対して駆動電流をバイパスさせるバイパス路を断接するバイパススイッチとを備える。この場合にバイパス路においてバイパススイッチと直列接続された抵抗成分を備えるようにする。【選択図】図1


    Access

    Download


    Export, share and cite



    Title :

    LIGHTING CIRCUIT, LIGHTING FIXTURE FOR VEHICLE


    Additional title:

    点灯回路、車両用灯具


    Contributors:

    Publication date :

    2017-02-09


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    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 AND VEHICLE LIGHTING FIXTURE

    KOBAYASHI RYO / NAKAOKA YUTO | European Patent Office | 2024

    Free access

    LIGHTING CIRCUIT AND VEHICLE LIGHTING FIXTURE

    YAGITSU SHOHEI / ITO MASAYASU / MURAMATSU TAKAO | European Patent Office | 2018

    Free access

    LIGHTING CIRCUIT AND VEHICLE LIGHTING FIXTURE

    ICHIKAWA TOMOYUKI / HARASAKI MASATO | European Patent Office | 2020

    Free access

    LIGHTING CIRCUIT AND VEHICLE LIGHTING FIXTURE

    ICHIKAWA TOMOYUKI / HARASAKI MASATO | European Patent Office | 2020

    Free access

    VEHICLE LIGHTING FIXTURE SYSTEM AND LIGHTING CIRCUIT

    YAMAZAKI ATSUSHI / SASAKI TATSUYA | European Patent Office | 2020

    Free access