Offline control circuit of LED driver to control the maximum...

Details Offline control circuit of LED driver to control the maximum... Offline control circuit of LED driver to control the maximum...

2008-01-03

2009-06-23

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S291000, C315S247000, C315S324000, C315S224000

Reexamination Certificate

active

07550933

ABSTRACT:
An offline control circuit of LED driver controls the maximum voltage and the maximum current of a plurality of LEDs. A switching circuit generates a plurality of LED currents through a transformer. A voltage-feedback circuit generates a voltage loop signal in response to the voltage across the LEDs. A current-feedback circuit senses a plurality of LED currents for generating a current loop signal in response the maximum current of the LEDs. A buffer circuit generates a feedback signal in accordance with the voltage loop signal and the current loop signal. The feedback signal is coupled to the switching circuit through an optical-coupler for controlling the maximum voltage and the maximum current of the LEDs.

REFERENCES:
patent: 2002/0154524 (2002-10-01), Yamanaka et al.
patent: 2008/0116818 (2008-05-01), Shteynberg et al.
patent: 2008/0129220 (2008-06-01), Shteynberg et al.

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