Dimming control circuit for light-emitting diodes

Details Dimming control circuit for light-emitting diodes Dimming control circuit for light-emitting diodes

2006-12-05

2006-12-05

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S308000, C315S360000, C315S224000, C315S169300, C315SDIG002

Reexamination Certificate

active

07145295

ABSTRACT:
A dimming control circuit generates a dimming control signal for determining brightness of at least one light-emitting diode. The dimming control signal has a plurality of bright-dark cycles, each of which consists of a bright phase and a dark phase. The bright phase starts with an adaptive rising portion. The adaptive rising portion restricts the brightness of the at least one light-emitting diode to increase gradually from zero.

REFERENCES:
patent: 6362578 (2002-03-01), Swanson et al.
patent: 6577072 (2003-06-01), Saito et al.
patent: 2006/0175986 (2006-08-01), Lee et al.
“Built-in OVP white LED Step-Up Converter.”, AIC 1648, Jul. 2004, pp. 1-10, Analog Integrations Corporation, Hsinchu, TW.
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“1.2A PWN Boost Regulator Photo Flash LED Driver.”, MIC2291, Aug. 2004, pp. 1-9, Micrel Inc., San Jose, CA, USA.
“Constant Current LED Driver.”, TPS61042, Jan. 2003, pp. 1-22, Texas Instruments Incorporated, Dallas, Texas, USA.

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