AC power supply apparatus and methods providing output control based on estimated instantaneous reactive power
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United States of America Patent
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Apr 15, 2003
Grant Date -
Jan 23, 2003
app pub date -
Jul 19, 2001
filing date -
Jul 19, 2001
priority date (Note) -
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Abstract
An AC power supply, e.g., an uninterruptible power supply (UPS), includes an output, a reference signal generator circuit operative to generate a reference signal representative of a desired voltage waveform at a node connected to the output, a power determiner circuit operative to generate an estimate of instantaneous reactive power transferred between the output and the node, and a reference signal compensator circuit responsive to the reference signal generator circuit and to the power determiner circuit and operative to generated a compensated reference signal from the reference signal responsive to the estimate of instantaneous reactive power. An AC voltage generator circuit is responsive to the reference signal compensator and operative to transfer current between the output and the node responsive to the compensated reference signal. For example, the AC voltage generator circuit may include a controlled inverter that includes an output voltage control loop that receives the compensate reference signal at a reference input thereof. Related methods are also described.
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