Electric power conversion systems – Current conversion – Including automatic or integral protection means
Reexamination Certificate
2005-10-11
2005-10-11
Laxton, Gary L (Department: 2838)
Electric power conversion systems
Current conversion
Including automatic or integral protection means
C315S255000, C315S277000
Reexamination Certificate
active
06954364
ABSTRACT:
A backlight inverter for an LCD panel which is capable of detecting a fault in a transformer device or an open-lamp condition and performing a control operation to stop its operation upon detecting the fault in the transformer device or the open-lamp condition. The inverter supplies a PWM signal through a switch in normal operation. The inverter also detects a voltage corresponding to current flowing through each lamp in a lamp device and determines from the detected voltage whether the open-lamp condition has occurred. The inverter further detects a voltage at a midpoint of secondary windings of the transformer device and determines from the detected voltage whether the fault exists in the transformer device. In the event of the open-lamp condition or the fault in the transformer device, the inverter turns off the switch.
REFERENCES:
patent: 4344122 (1982-08-01), Jones
patent: 6181066 (2001-01-01), Adamson
patent: 6259615 (2001-07-01), Lin
patent: 6359391 (2002-03-01), Li
patent: 6570334 (2003-05-01), Kastner
Laxton Gary L
Lowe Hauptman & Berner LLP
Samsung Electro-Mechanics Co. Ltd.
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