Automatic resolution changing method and circuit for use in digital conversion of two-phase sinusoidal wave signals
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United States of America Patent
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Aug 19, 2003
Grant Date -
Jun 13, 2002
app pub date -
Sep 25, 2001
filing date -
Oct 20, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides an automatic resolution changing method and circuit for use in a high-precision digital conversion of two-phase sinusoidal wave signals. The angular velocity (d.phi./dt) of the rotor obtained from the difference between these two-phase sinusoidal wave signals is integrated by a counter. Subsequently, digital conversion of the rotation angle (.theta.) of the rotor with respect to the stator is performed, and a result of the digital conversion is outputted. At this time, in the case where the angular velocity (d.phi./dt) is equal to or higher than a first percentage of the follow-up speed at the current resolution of the counter, the resolution of the counter is reduced. Further, in the case where the angular velocity (d.phi./dt) is equal to or lower than a second percentage of the follow-up speed at the current resolution of the counter, the resolution of the counter is increased.
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