Abnormality detecting device of electric power converting device and abnormality detecting method
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United States of America Patent
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Jun 8, 2010
Grant Date -
Jan 8, 2009
app pub date -
Jun 30, 2008
filing date -
Jul 4, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Each of three-phase arm of an inverter has first and second switching elements connected in series together at a connection point to the corresponding phase coil of the three-phase motor. Control device turns on the first switching element of the i-th (i is a natural number smaller than four) for a predetermined time period, and determines that the second switching element of the i-th arm has a short fault, when an overcurrent exceeding a predetermined threshold is detected within the predetermined time period. The predetermined time period is shorter than a time period from a time point of turning on the first switching element of the i-th arm to a time point of attaining the predetermined threshold by a current flowing through a path extending from a power supply line through the second switching element of the remaining arm other than the i-th arm to a ground line.
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