Voltage-mode drive for driving complex impedance loads

Details Voltage-mode drive for driving complex impedance loads Voltage-mode drive for driving complex impedance loads

2005-09-06

2005-09-06

Sniezek, Andrew L. (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S075000, C360S078040, C318S560000, C318S254100, C388S800000

Reexamination Certificate

active

06940685

ABSTRACT:
A method of driving an electrical load having a complex electrical impedance, such as a voice-coil motor controlling the position of a read/write head in a data storage disk drive system, comprises providing a voltage-mode driver generating drive signals for the electrical load in response to drive commands. Compensated commands for the voltage-mode driver are generated filtering the drive commands, compensating for a phase shift between electrical quantities delivered to the electrical load. The voltage-mode drive thus emulates a conventional, but more expensive, current-mode drive. In a preferred embodiment, the method comprises estimating characteristic parameters of the electrical load during the operation, and adapting the filtering to the estimated characteristic parameters. The estimation comprises implementing a Kalman filtering algorithm, particularly an extended Kalman filtering.

REFERENCES:
patent: 5859512 (1999-01-01), Büthker
patent: 5898283 (1999-04-01), Bennett
patent: 6285146 (2001-09-01), Harlan
patent: 6448726 (2002-09-01), Lukenich et al.
patent: 2002/0180392 (2002-12-01), Hill
patent: 0 822 649 (1998-02-01), None

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