Electric lamp and discharge devices: systems – Current and/or voltage regulation – Plural load device regulation
Reexamination Certificate
2008-02-05
2010-10-12
Owens, Douglas W (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Plural load device regulation
C315S297000, C315S307000
Reexamination Certificate
active
07812552
ABSTRACT:
Controller of LED lighting to control the maximum voltage of LEDs and the maximum voltage across current sources is provided. A voltage-feedback circuit is coupled to the LEDs to sense a voltage-feedback signal for generating a voltage loop signal. Current sources are coupled to the LEDs to control the LED currents. A detection circuit senses the voltages of the current sources for generating a clamp signal in response to a maximum voltage of the current sources. Furthermore, a buffer circuit generates a feedback signal in accordance with the voltage loop signal and the clamp signal. The feedback signal controls the maximum voltage of the LEDs and the maximum voltage across the current sources.
REFERENCES:
patent: 7443209 (2008-10-01), Chang
patent: 7550933 (2009-06-01), Yang
patent: 7642729 (2010-01-01), Saitoh et al.
patent: 2006/0028148 (2006-02-01), Ichikawa et al.
patent: 2007/0273681 (2007-11-01), Mayell
patent: 2008/0136350 (2008-06-01), Tripathi et al.
patent: 2008/0192514 (2008-08-01), Zhou et al.
Le Tung X
Owens Douglas W
Shia Banger
System General Corp.
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