System and method for driving LED

Details System and method for driving LED System and method for driving LED

2007-10-02

2007-10-02

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S308000, C315S247000, C315S312000, C315S224000, C323S282000, C323S280000, C323S304000

Reexamination Certificate

active

11142859

ABSTRACT:
A system drives one or plurality of LEDs regulating their brightness by controlling LEDs average current or voltage. The system includes a switching power converter and an integrated digital regulator with at least one of electrical, thermal and optical feedbacks. The regulator is constructed as a hysteretic peak current mode controller for continuous mode of operation of the power converter. For discontinuous mode of operation of the power converter a pulse averaging sliding mode control is being used. Average LED current is measured by integrating LED pulse current at off time and hysteretically adjusting on time of the power switch. Input battery is protected from discharging at abnormally low impedance of the output.

REFERENCES:
patent: 5465029 (1995-11-01), Hanazaki et al.
patent: 6239558 (2001-05-01), Fujimura et al.
patent: 6515434 (2003-02-01), Biebl
patent: 6747420 (2004-06-01), Barth et al.
patent: 6853155 (2005-02-01), Yamamoto et al.

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