Lamp power supply and protection circuit
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United States of America Patent
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N/A
Issued Date -
Oct 25, 2007
app pub date -
Apr 21, 2006
filing date -
Apr 21, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A power supply device for a CCFL or other lamp type regulates a current output to the CCFL regardless of lamp length and/or short circuit conditions. The power supply device for a lamp comprises a voltage regulating module that receives an input voltage signal and generates an output voltage signal that is substantially constant. A voltage driving module receives the output voltage signal and a detection signal, and generates a driving voltage signal. A current limiting module receives the driving voltage signal and generates a current supply signal that is substantially constant regardless of an impedance of a load that receives the current supply signal. A detection module communicates generates the detection signal. The detection signal is indicative of a voltage across the load. The voltage driving module discontinues the driving voltage signal if the detection signal indicates that the voltage is greater than a threshold.
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