HIGH EFFICIENCY LIGHT SOURCE WITH INTEGRATED BALLAST
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United States of America Patent
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Issued Date -
Aug 19, 2010
app pub date -
Oct 27, 2008
filing date -
Oct 26, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to regulated power supplies or ballasts integrated with an LED light source. The invention provides a power factor correction scheme producing a greater circuit power factor and improved frequency spectrum characteristics, in which a voltage corresponding to the instantaneous inductor current is sampled and compared to a scaled sample of the rectified input AC line voltage. The line voltage sample modulates the inductor peak charge current in the envelope of the rectified AC voltage waveform. This drives the LED output voltage at a frequency of twice the input line voltage frequency, such that no flicker is perceived in the light output because the persistence in LED phosphor assists in averaging the flux output.
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