Data processing: structural design – modeling – simulation – and em – Simulating electronic device or electrical system
Reexamination Certificate
2007-07-10
2007-07-10
Rodriguez, Paul (Department: 2123)
Data processing: structural design, modeling, simulation, and em
Simulating electronic device or electrical system
C702S038000, C318S615000, C360S264700
Reexamination Certificate
active
09464315
ABSTRACT:
A circuit (90) and method are presented to accurately determine a BEMF voltage of a VCM coil (20) after termination of a driving current in a first current direction in the coil (20). The circuit includes a circuit for activating selected VCM coil driver transistors (44–47) to apply a current to the coil (20) in a direction opposite the first current direction to generate a magnetic field to oppose eddy currents established in structures adjacent the coil (20) by the driving current. The time that the eddy current opposing current may be applied may be determined, for example, by determining a magnitude of the original current command, a time that the coil spends in flyback, or a magnitude of the original driving current, and adjusting the time of application of the eddy current opposing current accordingly.
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“Design and operation of a fully integrated BiC/DMOS head-actuator PIC for computer hard-disk drives,” Williams, R.K.; Chang, A.; Cornell, M.E.; Concklin, B. IEEE Trans on Electron Devices, vol. 38, Issue 7, Jul. 1991, pp. 1590-1599.
Du Tan
Rote John K.
Brady III Wade J.
Craig Dwin McTaggart
Rodriguez Paul
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