Energy savings device and method for a resistive and/or an inductive load
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United States of America Patent
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Apr 20, 2004
Grant Date -
May 15, 2003
app pub date -
Jul 26, 2002
filing date -
Nov 14, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An energy savings device for an inductive or resistive load, such as a fluorescent light fixture having a magnetic ballast, which is powered by an AC voltage waveform. The energy savings devices includes a setting unit for setting a desired power operating level for the load. The energy savings device also includes a microprocessor configured to receive a signal from the setting unit indicative of the desired power operating level for the load, to determine a phase delay to be provided to an output AC voltage waveform that is to be provided to the load, and to output a control signal as a result thereof. The energy savings device further includes an active element provided between a line that provides the input AC voltage waveform and the load, the active element receiving the control signal and turning off and on at predetermined times in accordance with the control signal, so as to create the output AC voltage waveform from the AC voltage waveform.
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