{
  "$type": "site.standard.document",
  "description": "A lighting circuit structured to turn on a plurality of semiconductor light sources is proposed, the lighting circuit comprising a plurality of current sources each of which is to be coupled to a corresponding semiconductor light source in series; a switching converter structured to supply a…",
  "path": "/patents/1406169",
  "publishedAt": "2025-03-05T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60Q1/04",
    "KOITO MFG CO LTD [JP]"
  ],
  "textContent": "A lighting circuit structured to turn on a plurality of semiconductor light sources is proposed, the lighting circuit comprising a plurality of current sources each of which is to be coupled to a corresponding semiconductor light source in series; a switching converter structured to supply a driving voltage across each of a plurality of series connection circuits each formed of the semiconductor light source and the current source; and a converter controller employing a ripple control method, wherein the plurality of current sources each comprise: a series transistor and a sensing resistor arranged in series with a corresponding semiconductor light source; and an error amplifier structured to adjust a voltage at a control electrode of the series transistor based on a voltage drop across the sensing resistor, and wherein the converter controller is structured to turn on the switching transistor of the switching converter in response to an output voltage of the error amplifier included in any one of the plurality of current sources satisfying a predetermined turn-on condition.",
  "title": "VEHICLE LAMP, ILLUMINATION CIRCUIT FOR SAME, CURRENT DRIVER CIRCUIT"
}