Electronic watch
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United States of America Patent
Stats
-
Sep 30, 2014
Grant Date -
Dec 6, 2012
app pub date -
Feb 9, 2011
filing date -
Feb 15, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
When recovering power from a motor driver, a forward voltage across a parasitic diode can reduce the recovery efficiency, and control of a power recovery operation can take an unnecessarily long time. In order to address this problem, the power recovery operation is performed as follows without being affected by a parasitic diode: near a peak position of a waveform of an induced current resulting from free oscillation of a rotor after a drive pulse is output, a recovery pulse having such a level that the rotor does not rotate is output from a terminal different from a motor driver terminal to which the drive pulse was output. Also, by adjusting the width and output timing of the recovery pulse based on a power supply voltage, the power recovery can be optimized for the power supply voltage.
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