MOTOR DRIVE HAVING FUNCTION OF DETECTING DC LINK CURRENT
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United States of America Patent
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Issued Date -
Mar 9, 2017
app pub date -
Aug 25, 2016
filing date -
Sep 4, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A motor drive according to the present invention includes an inverter circuit for converting a direct current into an alternating current by the switching of power elements and supplying the alternating current to a motor; a drive circuit for controlling the switching of the power elements; a fuse connected in series between a terminal of a DC link unit and a terminal of the inverter circuit through a conductor; a DC link current detection circuit for detecting a DC link current based on at least one of a voltage across the fuse, a voltage across a circuit including the fuse and part of the conductor, and a voltage across part of the conductor; and a DC link overcurrent detection circuit for detecting an overcurrent when the DC link current exceeds a predetermined value, and outputting a power element off command to turn off at least one of the power elements.
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