System and method for selectively dimming an LED
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United States of America Patent
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-
Mar 27, 2012
Grant Date -
Sep 23, 2010
app pub date -
Jan 18, 2010
filing date -
May 22, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Embodiments of the present disclosure include an LED ballast circuit for dimming one or more LEDs using a phase controlled dimmer switch. The LED ballast circuit has a power conditioning unit which includes a substantially fixed duty cycle clock for outputting a clock cycle and a transformer configured to store energy and discharge a substantial portion of the stored energy once per clock cycle in order to power one or more LEDs. The LED ballast circuit and load collectively behave like a resistor.
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