Intelligent drive circuit for a light emitting diode (LED)...

Details Intelligent drive circuit for a light emitting diode (LED)... Intelligent drive circuit for a light emitting diode (LED)...

2006-11-07

2006-11-07

Wong, Don (Department: 2163)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C372S031000

Reexamination Certificate

active

07132805

ABSTRACT:
A controller for controlling a light emitting diode (LED) light engine. The controller includes a temperature sensor configured to sensor temperature at the LED light engine. A current sensor senses a drive current of the LED light engine. A voltage differential sensor senses a voltage differential across LEDs of the LED light engine. A timer monitors a time of operation of the LED light engine. Further, a control device controls the drive current to the LED light engine based on the sensed temperature, the sensed drive current, the sensed voltage differential, and the monitored time of operation. Further, the control device outputs an indication of intensity degradation of an LED, and if the intensity degradation exceeds a predetermined threshold the control can output an indication of such to a user, so that the user can be apprised that the LED needs to be changed.

REFERENCES:
patent: 5019769 (1991-05-01), Levinson
patent: 6292497 (2001-09-01), Nakano
patent: 6914395 (2005-07-01), Yamauchi et al.
patent: 2004/0150590 (2004-08-01), Cok et al.
patent: 2005/0030267 (2005-02-01), Tanghe et al.

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