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公开(公告)号：US12017580B2
公开(公告)日：2024-06-25
申请号：US17793098
申请日：2021-01-13
发明人： Shinji Ohta , Susumu Ogo
IPC分类号： H05B47/155 , B60Q1/38 , B60Q1/40 , H05B45/37 , H05B45/48
CPC分类号： B60Q1/381 , B60Q1/40 , H05B47/155
摘要： A linear regulator supplies a first drive current to a first light source in a first period in which the first light source is turned on and a second light source is not turned on, and in a second period in which the first light source and the second light source are turned on, and stops the supply of the first drive current in a third period in which the first light source and the second light source are turned off. A switching regulator supplies a second drive current to the second light source in the second period, and stops the supply of the second drive current in the third period.
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公开(公告)号：US10173580B2
公开(公告)日：2019-01-08
申请号：US15662095
申请日：2017-07-27
发明人： Kotaro Matsui , Takao Sugiyama , Susumu Ogo
摘要： A lighting circuit which lights a semiconductor light source, the lighting circuit includes a drive circuit configured to receive a PWM signal from a controller, to generate a drive current to the semiconductor light source, and to switch the drive current according to the PWM signal. When a non-input state of the PWM signal exceeds a predetermined time, the lighting circuit is configured to assert an abnormality detection signal and to output the abnormality detection signal to the controller.
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公开(公告)号：US20180029526A1
公开(公告)日：2018-02-01
申请号：US15662095
申请日：2017-07-27
发明人： Kotaro Matsui , Takao Sugiyama , Susumu Ogo
CPC分类号： B60Q1/1423 , B60Q11/00 , B60Q11/002 , H05B33/0884
摘要： A lighting circuit which lights a semiconductor light source, the lighting circuit includes a drive circuit configured to receive a PWM signal from a controller, to generate a drive current to the semiconductor light source, and to switch the drive current according to the PWM signal. When a non-input state of the PWM signal exceeds a predetermined time, the lighting circuit is configured to assert an abnormality detection signal and to output the abnormality detection signal to the controller.
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