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

2007-10-11

2009-11-24

Duda, Rina I (Department: 2837)

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

C318S811000, C318S400320, C318S400340, C388S928100

Reexamination Certificate

active

07622880

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.

REFERENCES:
patent: 5615064 (1997-03-01), Blank et al.
patent: 6040671 (2000-03-01), Brito et al.
patent: 6611118 (2003-08-01), Abe et al.

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