Striking and open lamp regulation for CCFL controller
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United States of America Patent
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Aug 4, 2009
Issued Date -
N/A
app pub date -
Jul 5, 2007
filing date -
Jul 6, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method for igniting a lamp during a strike mode of an inverter comprising: sequentially controlling a duty cycle sweep and a frequency sweep of driving signals in the inverter to provide an increasing output voltage to the lamp. One embodiment advantageously includes a closed feedback loop to implement the duty cycle sweep and the frequency sweep such that an open lamp voltage is reliably regulated during the strike mode. For example, the closed feedback loop stops the duty cycle sweep or the frequency sweep when the output voltage to the lamp reaches a predetermined threshold and makes adjustments to the duty cycle or frequency the driving signals as needed to keep the output voltage at approximately the predetermined threshold if the lamp has not ignited.
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