Power converter and motor driving system
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United States of America Patent
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Apr 24, 2012
Grant Date -
Sep 16, 2010
app pub date -
Sep 11, 2009
filing date -
Sep 12, 2008
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An object of the present invention is to provide a power converter in which the open-phase can be detected in a broader frequency region even if a predetermined relation is kept between the output voltage and the frequency. In order to achieve the above objects, a power converter including: an inverter unit having phase unit inverters provided with a plurality of multiple connected single-phase cell inverters for every phase; an inverter controller for controlling the inverter unit so that a predetermined relation is kept between an output voltage and a frequency; and a plurality of transformers for detecting output voltages of the plurality of phase unit inverters, in which the inverter controller is provided with a fault detection unit for detecting whether a phase-to-phase voltage deviation calculated by the output voltage is within range of an allowable voltage deviation calculated as a function of the frequency is provided.
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