Adaptive algorithm for camera flash LED power control vs....

Details Adaptive algorithm for camera flash LED power control vs.... Adaptive algorithm for camera flash LED power control vs....

2011-08-02

2011-08-02

Chang, Daniel D (Department: 2819)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S24100S, C315S297000

Reexamination Certificate

active

07990074

ABSTRACT:
A method for driving a light-emitting semiconductor is provided. A supply voltage is converted into a secondary output voltage for supplying the light-emitting semiconductor with an output voltage. A level for the supply voltage at the beginning of a high current phase of the light-emitting semiconductor is sensed. A threshold voltage level for the supply voltage level is determined based on the sensed level. The high current phase with the light-emitting semiconductor is stated. The sensed level is continuously compared with the threshold voltage level, and an output current through the light-emitting semiconductor is controlled such that the sensed level does not drop below the threshold voltage level.

REFERENCES:
patent: 6791283 (2004-09-01), Bowman et al.
patent: 7265681 (2007-09-01), Chen
patent: 7782018 (2010-08-01), Voigt
patent: 7880404 (2011-02-01), Deng et al.
patent: 2003/0076051 (2003-04-01), Bowman et al.
patent: 10333418 (2005-02-01), None
patent: 2006081613 (2006-08-01), None

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