Multiple CCFL current balancing scheme for single controller topologies
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United States of America Patent
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-
Oct 1, 2002
Grant Date -
Sep 12, 2002
app pub date -
Apr 16, 2001
filing date -
Mar 7, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The multiple lamp circuit for minimizing lamp current imbalance comprises at least one transformer comprising primary windings and secondary windings. Multiple lamps are coupled in serial to the secondary windings of the transformer. Multiple separated lamp drive circuits are spliced from the transformer's secondary windings. A current balancing resistance is connected at a common node of the multiple lamps and other terminal of the current balancing resistance is connected to ground. The impedance of the current balancing resistance is relatively high compared to the ones of the multiple lamps to generate a balancing current for one of the multiple lamps, thereby resulting a current that flows through the multiple lamps is approximately equal.
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