Lighting controller for lighting device for vehicle

Details Lighting controller for lighting device for vehicle Lighting controller for lighting device for vehicle

2006-10-16

2009-12-22

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Special application

Vehicle

C315S076000

Reexamination Certificate

active

07635952

ABSTRACT:
In a process in which a current is supplied from a switching regulator to multi-chip LEDs, the forward voltages of the LEDs are respectively detected in forward detecting circuits. The detected values are sent to a microcomputer. In the microcomputer, detected values when the multi-chip LEDs are initially turned on are stored as initial values. A first abnormality deciding value is set from the initial value. The detected values are sequentially stored as updated values. Second abnormality deciding values having conditions stricter than those of the first abnormality deciding value are sequentially set in accordance with the stored updated value. A read value is compared with the first abnormality deciding value or the read value is compared with the second abnormality deciding value to decide whether or not the abnormality of the LEDs is present. When it is decided that the LEDs are abnormal, an LED is turned on to inform a driver of the presence of the abnormality.

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German Office Action issued in German Application No. 10 2006 049 291.9-31 dated Jan. 15, 2007 and English translation thereof, 14 pages.

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