Open protection circuit for backlight module

Details Open protection circuit for backlight module Open protection circuit for backlight module

2008-05-13

2008-05-13

Tran, Thuy V. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S312000, C361S093700

Reexamination Certificate

active

11604620

ABSTRACT:
An open protection circuit (300) for a backlight module includes a PWM (350) with a control port (351) to disable the PWM. A switch (371) has a gate and a source connected to the control port. A plurality of first input circuits (330) includes first diodes (331), each of which has a first positive terminal connected to the gate and a negative terminal connected to ground. A plurality of second input circuits (340) include input resistors (341) connected to the control port. A plurality of detecting circuits (310, 380) are connected to the fluorescent lamps (311) and the first and second input circuits respectively. Each detecting circuit includes a sampling resistor (313) connected to one of the negative terminals of the first diodes, thereby the control port of the PWM is pulled low when either one of the fluorescent lamps are open-circuit.

REFERENCES:
patent: 5680017 (1997-10-01), Veldman et al.
patent: 5923129 (1999-07-01), Henry
patent: 6011360 (2000-01-01), Gradzki et al.
patent: 6084360 (2000-07-01), Yokokawa et al.
patent: 6376999 (2002-04-01), Li et al.
patent: 6947024 (2005-09-01), Lee et al.
patent: 2005/0127851 (2005-06-01), Song et al.
patent: 2005/0253537 (2005-11-01), Jang et al.
patent: 2005/0269970 (2005-12-01), Jang et al.

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