Digital ballast
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United States of America Patent
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Dec 11, 2007
Grant Date -
Apr 20, 2006
app pub date -
Nov 8, 2005
filing date -
May 31, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A ceiling fan including a lamp ballast in which the drive current frequency is controlled by a voltage-controlled oscillator (VCO) that is capable of precise output frequency control. The VCO frequency is controlled by a microcontroller. The microcontroller may control the VCO frequency in response to various input signals including a triac signal, a manual dimmer control signal, a remote control receiver signal, a light monitor signal, a motion detector signal, or a communication interface signal.
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