Apparatus to detect the zero-cross of the BEMF of a three-phase electric motor and related method
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United States of America Patent
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Jul 12, 2016
Grant Date -
Jan 1, 2015
app pub date -
Jun 18, 2014
filing date -
Jun 28, 2013
priority date (Note) -
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Abstract
A device may detect the zero-cross event of a BEMF of an electric motor with first, second, and third phase windings driven by respective first, second, and third power driving stages. The device may include a control circuit configured to place at an impedance state the third power driving stage relative to the third phase winding, the third phase winding being coupled to a zero-cross detecting circuit, introduce a masking signal to mask an output signal of the zero-cross detecting circuit in correspondence with each rising edge of a first driving signal of the first power driving stage relative to the first phase winding, and determine whether a first duty-cycle of the first driving signal is such that a duration of a masking window of the masking signal is greater than an on-time period of the first driving signal.
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