Load failure protection circuit and discharge lamp driving...

Details Load failure protection circuit and discharge lamp driving... Load failure protection circuit and discharge lamp driving...

2007-11-06

2007-11-06

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S291000, C315S312000, C315S224000, C315S2090SC

Reexamination Certificate

active

11401974

ABSTRACT:
The present invention provides a load failure protection circuit and a discharge lamp driving apparatus, which can exactly detect a failure even if the failure arises in any of a plurality of discharge lamps, and can stop drive of the discharge lamp. A part of currents of corresponding CCFLs (201and202) flows into two bypass resistors (21aand21b), further, a full current of the bypass resistors (21aand21b) flows into a resistor for full current detection (22), and its voltage drop is inputted into a control IC (1) as a feedback signal. On the other hand, cathodes of Zener diodes (25aand25b) are connected to end parts of the bypass resistors (21aand21b) on each CCFL side. When potential of any one of the cathodes rises by a load failure, a corresponding one of the Zener diodes (25aand25b) generates a Zener voltage for a transistor (26) to become conductive. Therefore, since a feedback signal line connected to the collector of the transistor (26) is made at the ground potential forcibly, it is decided to be a load failure by the control IC (1), and drive of the discharge lamp is stopped.

REFERENCES:
patent: 5621281 (1997-04-01), Kawabata et al.
patent: 6359391 (2002-03-01), Li
patent: 6498437 (2002-12-01), Chang et al.
patent: 2002/0163822 (2002-11-01), Lin
patent: 2004/0212310 (2004-10-01), Ito et al.
patent: 2004/0240235 (2004-12-01), Min
patent: 2004/0263092 (2004-12-01), Liu
patent: 1 617 712 (2006-01-01), None
patent: 2004-265868 (2004-09-01), None

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