Backlight LED drive circuit

Details Backlight LED drive circuit Backlight LED drive circuit

2008-10-21

2011-10-04

Chang, Daniel D (Department: 2819)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S308000, C315S224000, C315S291000, C345S102000

Reexamination Certificate

active

08030857

ABSTRACT:
A backlight LED drive circuit20includes a step-up DC/DC converter22for stepping up a DC power voltage based on a PWM signal and supplying the voltage to the anode of an LED device12c, a voltage detector24for detecting a feedback voltage FBV based on a voltage at a terminal22bcoupled to the cathode of the LED device, a PWM control circuit26for outputting a PWM signal to the step-up DC/DC converter22so that the feedback voltage FBV may become a predetermined voltage, and a PWM stop circuit28for stopping the PWM signal when the feedback voltage FBV is below a second predetermined voltage set smaller than the predetermined voltage. Thereby, such backlight LED drive circuit causes no troubles even when terminal to which the LED device is connected is rendered open.

REFERENCES:
patent: 6909249 (2005-06-01), Otake
patent: 7531971 (2009-05-01), Weng
patent: H03-255684 (1991-11-01), None
patent: 2007-013183 (2007-01-01), None
patent: 2007-096296 (2007-04-01), None

Affiliated with

Also associated with

Rating

Backlight LED drive circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Backlight LED drive circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Backlight LED drive circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4275350