Electronic ballast with dimming control from power line sensing
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United States of America Patent
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Nov 29, 2011
Grant Date -
Jan 20, 2011
app pub date -
Jul 20, 2009
filing date -
Jul 20, 2009
priority date (Note) -
Expired
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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 control voltage generator, used to generate a control voltage according to a switching count of a power line; an oscillator, used to generate an oscillating signal, wherein the oscillating signal is of a fixed frequency and has a rising voltage portion and a falling voltage portion; and a comparator, used to generate a high side gating signal according to voltage comparison of the oscillating signal and the control voltage.
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