公开(公告)号：US20180255614A1

公开(公告)日：2018-09-06

申请号：US15759862

申请日：2016-09-27

申请人： KELSEY-HAYES COMPANY

发明人： Jeffrey A. Sewell

IPC分类号： H05B33/08

CPC分类号： H05B33/0815 ,  B60Q3/18 ,  B60Q3/80 ,  H05B33/0848 ,  H05B33/089 ,  H05B33/0893 ,  Y02B20/347

摘要： A closed-loop LED drive circuit includes at least one LED, a voltage source, and a voltage regulator connected to the voltage source to provide a regulated voltage output. A one-time-programmable voltage source is connected to an output of the voltage regulator and a current controlled drive circuit is connected to the one-time-programmable voltage source for providing a drive current to the at least one LED in response to an output from the one-time-programmable voltage source. An end of line tester monitors the light intensity of the LED device and provides a signal indicative thereof to said one-time-programmable voltage source. The one-time-programmable voltage source stores the light intensity value and uses the light intensity value to control its output voltage to the current control drive circuit.