Digitally controlled current regulator for high power solid...

Details Digitally controlled current regulator for high power solid... Digitally controlled current regulator for high power solid...

2007-05-18

2011-11-29

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S18500S, C315S224000, C315S291000, C315S312000, C345S102000, C345S082000, C345S204000, C345S212000

Reexamination Certificate

active

08067896

ABSTRACT:
An exemplary apparatus embodiment provides for controlling current supplied to solid state lighting, such as light emitting diodes. An exemplary apparatus comprises a memory adapted to store a plurality of current parameters; and a control circuit adapted to modulate an energizing cycle time period for providing a substantially constant DC average current to the solid state lighting in response to a selected current parameter of the plurality of current parameters. In an exemplary embodiment, the control circuit modulates a current provided to the solid state lighting in response to a predetermined minimum current level (IMIN) parameter and a predetermined peak current level (IP) parameter, such that the DC average current level (IO) is substantially proportional to one-half of a sum of a predetermined peak current level (“IP”) and a predetermined minimum current levelIM⁡(IO∝IP+IMIN2).

REFERENCES:
patent: 6801003 (2004-10-01), Schanberger et al.
patent: 7116052 (2006-10-01), Ito et al.
patent: 7659673 (2010-02-01), Lys
patent: 2002/0047624 (2002-04-01), Stam et al.

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