LED drive circuit

Details LED drive circuit LED drive circuit

2005-01-18

2005-01-18

Ton, My-Trang Nu (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S514000

Reexamination Certificate

active

06844760

ABSTRACT:
A drive circuit for LEDs or other light-emitting elements with which the influence of the changes in temperature or power supply voltage and the element variations can be restrained in order to output a pulse current with a constant level. When n-type MOS transistor10is on, power is supplied from switching power supply60to the LED, and the current of LED is detected by resistor20. The error signal Serr between said detection signal Sfb and setpoint signal Sref is generated by error signal generating unit30and is averaged by signal holding unit40. The power supplied to the LED is controlled corresponding to the averaged error signal SerrA. When n-type MOS transistor10is turned off from the on state, the power supplied to the LED is stopped, and error signal SerrA is held in signal holding unit40. When n-type MOS transistor10is turned on from the off state, the averaging of error signal Serr is started with the signal level of the held error signal SerrA used as the initial level.

REFERENCES:
patent: 5514989 (1996-05-01), Sato et al.
patent: 6472854 (2002-10-01), Ootani
patent: 6628252 (2003-09-01), Hoshino et al.
patent: 6724376 (2004-04-01), Sakura et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3385172