PROBLEM TO BE SOLVED: To provide a lighting circuit in which an overcurrent is suppressed.SOLUTION: A constant current output switching converter 202 is ripple controlled. A current smoothing circuit 220 smoothes an output current Iof the switching converter 202 and supplies it to a light source 102. The current smoothing circuit 220 changes a resonance frequency or impedance in response to a change of the target value Iof the output current Iof the switching converter 202.SELECTED DRAWING: Figure 4
【課題】過電流を抑制した点灯回路を提供する。【解決手段】定電流出力のスイッチングコンバータ202はリップル制御される。電流平滑回路220は、スイッチングコンバータ202の出力電流IOUTを平滑化し、光源102に供給する。電流平滑回路220は、スイッチングコンバータ202の出力電流IOUTの目標値IREFの変更に応答して、共振周波数またはインピーダンスが変化する。【選択図】図4
CONSTANT CURRENT DRIVING CIRCUIT AND VEHICULAR LAMP
定電流駆動回路および車両用灯具
2018-07-05
Patent
Electronic Resource
Japanese
IPC: | H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / 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 |
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