Converter, motor driving module, and refrigerating apparatus
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United States of America Patent
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Sep 30, 2014
Grant Date -
Dec 20, 2012
app pub date -
Mar 31, 2010
filing date -
Mar 31, 2010
priority date (Note) -
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Abstract
A converter includes three AC reactors, a three-phase diode bridge, a plurality of smoothing capacitors connected in series between a DC output side of the three-phase diode bridge and a DC load, two flywheel diodes connected to positive and negative terminals on the DC side of the three-phase diode bridge, respectively. A reactor is inserted between the midpoint of the two flywheel diodes and the midpoint of the smoothing capacitors, three both-way energizing switches are arranged between the AC side of the three-phase diode bridge and the midpoint of the two flywheel diodes. The three both-way energizing switches are controlled to reduce higher harmonic components of power source current, and by the reactor interposed between the midpoint of the two flywheel diodes and the midpoint of the smoothing capacitors, reverse recovery currents of the three-phase diode bridge during turn-on of the three both-way energizing switches are suppressed.
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