Sensed motor winding current adapting blanking period between max/min values
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United States of America Patent
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Jul 19, 2016
Grant Date -
Jan 29, 2015
app pub date -
Apr 21, 2014
filing date -
Jul 29, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
Stepper motor winding current regulation methods and apparatus adapt a maximum blanking period to generate an adapted blanking period that is proportional to a currently-selected current regulation set-point. Sensed winding current feedback is ignored at a current regulation controller during the adapted blanking period or during a minimum blanking period, whichever longer, to avoid attempting to track noise imposed upon a sensed winding current feedback signal at an initiation of rapid current changes di/dt. Doing so may decrease ripple in the motor winding current waveform and reduce zero-crossing distortion by decreasing overshoot of the current regulation set-point by the sensed winding current.
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