LED driving circuitry with light intensity feedback to control o

Details LED driving circuitry with light intensity feedback to control o LED driving circuitry with light intensity feedback to control o

1999-07-09

2000-11-28

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315149, 315150, 315156, G05F 100

Patent

active

061539856

ABSTRACT:
An LED indicator system with at least one LED, and driving circuitry for driving the at least one LED. A power supply supplies a drive current to the at least one LED. A photodetector detects a luminous output of the at least one LED and correspondingly outputs a detection signal. A conditioning circuit removes signal components indicative of stray light from at least one source other than the at least one LED, for example from sunlight reflected off of an LED array including the at least one LED, from the detection signal. As a result, the conditioning circuit generates a synthesized intensity feedback signal to provide to the power supply. The LED indicator system and driving circuitry for the at least one LED may further include a controller which compares the current supplied by the power supply to the at least one LED with the synthesized intensity feedback signal. A transmitter may transmit a signal indicating a result of the comparison executed by the controller.

REFERENCES:
patent: 5608225 (1997-03-01), Kamimura et al.

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