Gas-discharge lamp controller utilizing a novel preheating phase control mechanism
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United States of America Patent
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May 28, 2013
Grant Date -
Nov 24, 2011
app pub date -
May 20, 2010
filing date -
May 20, 2010
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Abstract
A gas-discharge lamp controller utilizing a novel preheating phase control mechanism, having: a supply voltage tracking reference voltages generator, biased between a supply voltage and a reference ground, for generating a first reference voltage which is proportional to the supply voltage; and a control unit, for generating a high threshold signal according to the first reference voltage and a saw-tooth signal, the peak value of the saw-tooth signal being proportional to the supply voltage, wherein the control unit has a preheating phase, the high threshold signal is coupled with the first reference voltage during the preheating phase, and the time duration of the preheating phase is set by a predetermined number of periods of the saw-tooth signal.
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