Device for driving light emitting diode strings

Details Device for driving light emitting diode strings Device for driving light emitting diode strings

2007-05-29

2007-05-29

Vu, David (Department: 2821)

Electric lamp and discharge devices: systems

Plural series connected load devices

Christmas lights

C315S169300, C315S307000

Reexamination Certificate

active

11085567

ABSTRACT:
A device for driving light emitting diode (LED) string, including a DC(direct current)-to-DC converter, a LED string, a switch and a feedback circuit. The DC-to-DC converter includes a first DC-to-DC converter end for outputting a DC voltage according to a feedback signal. The LED string is coupled to the first DC-to-DC converter end. The switch is coupled to the LED string. When the switch is turned on, the LED string is driven by the DC voltage, and then a DC current is flowed through the LED string. The feedback circuit outputs the feedback signal according to the DC current. When the switch is turned on, the LED string is quickly turned on to a predetermined brightness. When the switch is turned off, the LED string is quickly turned off.

REFERENCES:
patent: 7042164 (2006-05-01), Yazawa
patent: 2006/0001381 (2006-01-01), Robinson et al.

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