Controller for power transducers
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United States of America Patent
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Jun 1, 1999
Grant Date -
N/A
app pub date -
Jun 20, 1997
filing date -
Feb 5, 1997
priority date (Note) -
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Abstract
A controller for controlling power transducers to maintain a balanced three-phase output voltage with no influence on current control even when an unbalanced load is connected to a three-phase output of an inverter of the power transducer. The controller provides a stable high-precision three-phase voltage to a load by suppressing higher harmonic voltage components even when a non-linear load is connected. The controller includes a voltage regulator circuit having, for each phase, circuitry calculating a mean value of the output voltage of the inverter. The controller detects and controls deviation in the output voltage from a single-phase mean voltage command. The controller determines a voltage deviation ratio from the deviation and multiplies each output voltage value by the voltage deviation ratio and uses the product as a new voltage detection value.
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