Electric lamp and discharge devices: systems – With automatic shunt and/or cutout
Reexamination Certificate
2006-05-30
2011-10-04
Choi, Jacob Y (Department: 2821)
Electric lamp and discharge devices: systems
With automatic shunt and/or cutout
C315S308000, C315S307000, C315S277000, C315S291000, C315S224000
Reexamination Certificate
active
08030850
ABSTRACT:
In an apparatus for driving a CCFL, a first inverter outputs a first alternating current (AC) voltage to one end of the CCFL. A second inverter outputs a second AC voltage having a reversed phase to the first AC voltage to the other end of the CCFL. A first current-voltage converting circuit converts a secondary current of a first transformer in the first inverter to a voltage and outputs the voltage as a first detection voltage. A second current-voltage converting circuit converts a secondary current of a second transformer in the second inverter to a voltage and outputs the voltage as a second detection voltage. A first abnormality detection circuit determines a circuit abnormality when the potential difference between the first and second detection voltages exceeds a predetermined first threshold voltage.
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Alemu Ephrem
Cantor & Colburn LLP
Choi Jacob Y
Rohm & Co., Ltd.
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