Time division modulation with average current regulation for...

Details Time division modulation with average current regulation for... Time division modulation with average current regulation for...

2011-03-08

2011-03-08

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S18500S, C315S192000, C315S308000

Reexamination Certificate

active

07902771

ABSTRACT:
Exemplary apparatus, method and system embodiments provide for separately and independently sourcing current to a series of light emitting diodes of a plurality of series of light-emitting diodes. An exemplary apparatus comprises a power converter which generates a current, a first multiplexer, and a controller. The controller provides for sequential and separate switching of the current through the first multiplexer to each of the series of light-emitting diodes for a corresponding period of time. An average current provided by the power converter is determined as substantially equal to a sum of the corresponding currents through the plurality of series of light-emitting diodes. A total period for switching current to all of the series of light-emitting diodes is also determined. A corresponding time period for switching current to a selected corresponding series of light-emitting diodes is substantially equal to a proportion of the total period determined as a ratio of the corresponding current for the selected corresponding series of light-emitting diodes to the average current provided by the power converter.

REFERENCES:
patent: 5694208 (1997-12-01), Ichikawa
patent: 2005/0151489 (2005-07-01), Lys et al.
patent: 2006/0192663 (2006-08-01), Bryan et al.
patent: 2006/0211055 (2006-09-01), Hafeman et al.
patent: 2006/0220571 (2006-10-01), Howell et al.

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