Driving circuit and driving method of stepping motor and electronic machine using the same
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United States of America Patent
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Feb 15, 2022
Grant Date -
Sep 17, 2020
app pub date -
Mar 11, 2020
filing date -
Mar 14, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
A back electromagnetic force detection circuit detects a counter EMF generated in a coil of a stepping motor. A revolution count detection circuit generates a revolution count detection signal. A determining circuit generates a determination signal that is asserted if the revolution count detection signal is stable across multiple consecutive cycles. A current value setting circuit generates a current setting value indicating a target value of a coil current. The current value setting circuit sets the current setting value to a predetermined value in a period in which the determination signal is negated, and adjusts the current setting value according to the counter EMF in a period in which the determination signal is asserted. A constant current chopper circuit generates a pulse modulation signal that modulates by way of having a detection value of a coil current approach close to a target value of the current setting value.
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