PROBLEM TO BE SOLVED: To provide a lighting circuit having enhanced stability of a driving current.SOLUTION: An error amplifier 212 amplifies an error between a first current detection signal Vaccording to any direct current component of coil current I, input current and output current Iof a switching converter 102 and an analog signal Vindicating a driving current Ito a semiconductor light source 10 to generate an error signal V. A comparator 214 compares a second current detection signal Vaccording to any one of coil current I, input current and output current Iwith a threshold signal Vdetermined according to the error signal V. A switching transistor M1 becomes a first state in a predetermined time after the second current detection signal Vcoincides with the threshold signal V, and becomes a second state until the second current detection signal Vcoincides with the threshold signal V.SELECTED DRAWING: Figure 5

    【課題】駆動電流の安定性を高めた点灯回路を提供する。【解決手段】エラーアンプ212は、スイッチングコンバータ102のコイル電流IL、入力電流、出力電流ILのいずれかの直流成分に応じた第1電流検出信号VCS1と半導体光源10への駆動電流ILAMPを指示するアナログ信号VADIMとの誤差を増幅し、誤差信号VERRを生成する。コンパレータ214は、コイル電流IL、入力電流、出力電流IOUTのいずれかに応じた第2電流検出信号VCS2を、誤差信号VERRに応じて定まるしきい値信号VTHと比較する。スイッチングトランジスタM1は、第2電流検出信号VCS2がしきい値信号VTHと一致してから所定時間の間、第1状態となり、次に第2電流検出信号VCS2がしきい値信号VTHと一致するまでの間、第2状態となる。【選択図】図5


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    Title :

    LIGHTING FIXTURE FOR VEHICLE AND LIGHTING CIRCUIT OF LIGHT SOURCE


    Additional title:

    車両用灯具および光源の点灯回路


    Contributors:

    Publication date :

    2017-12-21


    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




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