Current regulator for multimode operation of solid state...

Details Current regulator for multimode operation of solid state... Current regulator for multimode operation of solid state...

2007-02-02

2010-12-14

Vo, Tuyet Thi (Department: 2821)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S098000, C345S212000, C345S207000, C345S204000, C315S247000, C315S20000A, C315S201000, C315S312000

Reexamination Certificate

active

07852300

ABSTRACT:
An exemplary apparatus embodiment provides a plurality of operating modes for solid state lighting, such as a flash mode and a constant or background lighting mode for use with devices such as cameras. An exemplary apparatus comprises a memory adapted to store a plurality of average current parameters; and a controller adapted to modulate an energizing cycle time period (“T”) for providing power to the solid state lighting as proportional to the product of the selected average current parameter (“a”) and a reset time period (“TR”) for an inductor current to return to a substantially zero level from a predetermined peak level (T∝a·TR). The average current parameter is predetermined as substantially proportional to a ratio of a peak inductor current level (“IP”) to an average output D.C. current level(“IO”)⁢(a∝IPIO).

REFERENCES:
patent: 5949198 (1999-09-01), Nakamura et al.
patent: 7130468 (2006-10-01), Meyer et al.
patent: 2007/0267978 (2007-11-01), Shteynberg et al.
patent: 2008/0116818 (2008-05-01), Shteynberg et al.

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