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公开(公告)号：US20220022300A1
公开(公告)日：2022-01-20
申请号：US17488850
申请日：2021-09-29
IPC分类号： H05B47/10 , H05B45/46 , H05B45/325 , B60Q1/04
摘要： A lighting circuit turns on a plurality of semiconductor light sources. Multiple current sources are each coupled to a corresponding semiconductor light source. A switching converter supplies a driving voltage VOUT across each of multiple series connection circuits each formed of the semiconductor light source and the current source. A converter controller employing a ripple control method turns on a switching transistor of the switching converter in response to a voltage across any one of the multiple current sources decreasing to a bottom limit voltage.
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公开(公告)号：US20210378070A1
公开(公告)日：2021-12-02
申请号：US17402941
申请日：2021-08-16
IPC分类号： H05B45/375 , F21S41/663 , F21S41/141 , H05B45/34 , H05B45/44 , B60Q1/14 , B60Q11/00 , H05B45/52 , H05B45/56
摘要： A lighting circuit turns on multiple semiconductor light sources. Multiple current sources are each coupled in series with a corresponding one from among the semiconductor light sources. A switching converter supplies a driving voltage VOUT across each of multiple series connection circuits formed of the multiple semiconductor light sources and the multiple current sources. A converter controller controls a switching transistor of the switching converter based on a relation between a voltage across one from among the multiple current sources and a reference voltage having a positive correlation with the temperature Tj.
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公开(公告)号：US20200275542A1
公开(公告)日：2020-08-27
申请号：US16874124
申请日：2020-05-14
IPC分类号： H05B45/46 , H05B45/325 , B60Q1/04
摘要： A lighting circuit turns on a plurality of semiconductor light sources. Multiple current sources are each coupled to a corresponding semiconductor light source. A switching converter supplies a driving voltage VOUT across each of multiple series connection circuits each formed of the semiconductor light source and the current source. A converter controller employing a ripple control method turns on a switching transistor of the switching converter in response to a voltage across any one of the multiple current sources decreasing to a bottom limit voltage.
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公开(公告)号：US20220022299A1
公开(公告)日：2022-01-20
申请号：US17488759
申请日：2021-09-29
IPC分类号： H05B47/10 , H05B45/46 , H05B45/325 , B60Q1/04
摘要： A lighting circuit turns on a plurality of semiconductor light sources. Multiple current sources are each coupled to a corresponding semiconductor light source. A switching converter supplies a driving voltage VOUT across each of multiple series connection circuits each formed of the semiconductor light source and the current source. A converter controller employing a ripple control method turns on a switching transistor of the switching converter in response to a voltage across any one of the multiple current sources decreasing to a bottom limit voltage.
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公开(公告)号：US20210016706A1
公开(公告)日：2021-01-21
申请号：US17064695
申请日：2020-10-07
IPC分类号： B60Q1/14 , F21S41/141 , F21S41/663 , H05B45/50 , H05B45/44 , H05B45/34 , B60Q11/00
摘要： A lighting circuit turns on multiple semiconductor light sources. Multiple current sources are each coupled in series with a corresponding one from among the semiconductor light sources. A switching converter supplies a driving voltage VOUT across each of multiple series connection circuits formed of the multiple semiconductor light sources and the multiple current sources. A converter controller controls a switching transistor of the switching converter based on a relation between a voltage across one from among the multiple current sources and a reference voltage having a positive correlation with the temperature Tj.
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