Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
November 24, 2009
Patent Application Number
11871110
Date Filed
October 11, 2007
Patent Primary Examiner
Patent abstract
A circuit for controlling a voice-coil motor (VCM) may incorporate a pulse-width modulation driver to drive the VCM, a zero-current detector to determine whether the current across the VCM is zero, and a Back-EMF voltage detector to measure the voltage across the VCM when the current across the VCM is determined to be zero. The circuit may determine the current velocity of the VCM and use this information to control the velocity of the VCM.
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