Lamp abnormality detecting device and inverter, backlight...

Details Lamp abnormality detecting device and inverter, backlight... Lamp abnormality detecting device and inverter, backlight...

2011-08-23

2011-08-23

Tran, Anh Q (Department: 2819)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S224000, C315S291000, C315S307000

Reexamination Certificate

active

08004215

ABSTRACT:
One embodiment of the present invention relates to a lamp abnormality detecting device that detects an abnormality in a lamp. A maximum/minimum extraction circuit outputs, as a maximum current, a current having a maximum current value among currents supplied thereto from lamp drive circuits and outputs, as a minimum current, a current having a minimum current value. A subtraction circuit calculates a difference between the maximum current and the minimum current and outputs an amplified difference as a differential voltage. A comparison circuit compares the differential voltage with a predetermined threshold voltage and outputs a result of the comparison as a control signal. A control circuit stops the operation of the lamp drive circuit when the control signal indicates that the differential voltage is higher than the threshold voltage.

REFERENCES:
patent: 6954364 (2005-10-01), Min
patent: 2002/0130628 (2002-09-01), Shin
patent: 2006/0038592 (2006-02-01), Inoue et al.
patent: 64-050395 (1989-02-01), None
patent: 1-167986 (1989-07-01), None
patent: 2002-231034 (2002-08-01), None
patent: 2006-66220 (2006-03-01), None

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