Electronic ballast with dimming control from power line sensing
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United States of America Patent
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Jul 19, 2011
Grant Date -
Nov 4, 2010
app pub date -
May 1, 2009
filing date -
May 1, 2009
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention discloses an electronic ballast with dimming control from power line sensing for a fluorescent lamp, comprising: a line switching sensing circuit, used to generate a switching sensing signal by performing a voltage comparison operation on a DC voltage, and generate a reset signal according to the off time of the power line; a dimming voltage generator, used to generate a dimming voltage according to a count of the switching sensing signal; and a phase-controlled non-overlapping driver, used to generate a high side driving signal and a low side driving signal for delivering a lamp current according to the dimming voltage, wherein the dimming voltage is used to generate a phase, and the phase is used to generate the lamp current.
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