Voice-coil motor control with zero-current sensing

Details Voice-coil motor control with zero-current sensing Voice-coil motor control with zero-current sensing

2011-04-12

2011-04-12

Duda, Rina I (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S459000

Reexamination Certificate

active

07923954

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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