Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1996-04-30
1998-11-17
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 75, G11B 554
Patent
active
058385150
ABSTRACT:
A voice coil motor (VCM) driver has four field effect transistors connected to a motor coil as an H-bridge. A sense resistor in series with the coil and the H-bridge senses coil current. A feedback amplifier provides a feedback signal from a voltage developed across the sense resistor. A summing junction sums current command signals with the feedback signal. A transconductance loop compensation amplifier has an inverting input connected to the summing junction, has a non-inverting input connected to a reference level, and has an output control signal node. The control level is connected to control linear transconductance differential driver amplifiers including the four field effect transistors during a linear drive mode. A pulse width modulation (PWM) generator connected to the output control signal node generates variable duty cycle pulses related to the control level during a PWM drive mode applies the pulses to a first one of the four field effect transistors, and a polarity control circuit responds to a driving current direction signal by controlling another one of the four field effect transistors during the PWM drive mode.
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Data Sheet, TLS2204 Voice-Coil Motor Driver, Spindle Motor Driver, and Voltage Monitor Texas Instruments, Inc., Dallas, Texas, Oct. 1992.
Ataee Mehran
Mortazavi Sassan
Chun Debra A.
Harrison David B.
Klauzinski Robert V.
Psitos Aristotelis M.
Quantum Corporation
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