Power converting device
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United States of America Patent
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Feb 3, 2009
Grant Date -
Aug 23, 2007
app pub date -
Feb 23, 2006
filing date -
Feb 23, 2006
priority date (Note) -
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Abstract
A power converting device includes a single-phase multiplex converter used as an active filter and a control device. The single-phase multiplex converter includes multiple single-phase inverters connected in series at AC output sides. Each of the single-phase inverters converts DC power fed from a DC power supply into AC power. The control device includes hysteresis comparators and controls output voltage of the single-phase multiplex converter by gradational output voltage control, based on the sum of selectively combined output voltages of the multiple single-phase inverters. The control device controls the single-phase multiplex converter so that an output current follows a harmonic compensation reference current, canceling harmonics leaking from a load to which the power converting device is connected.
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