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Inhibition of power supply variations for gain error cancellation in pulse-width-modulated motor controllers

A technology of pulse width modulation and power supply voltage, which is applied in the direction of aligning the magnetic track on the disk, the configuration/installation of the recording head, and maintaining the alignment of the head frame, which can solve the problems of positioning error, lengthening the track determination time, etc.

Inactive Publication Date: 2007-05-09
TEXAS INSTR INC
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is believed that these gain changes lengthen the track settling times and, in severe cases, may cause positioning errors

Method used

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  • Inhibition of power supply variations for gain error cancellation in pulse-width-modulated motor controllers
  • Inhibition of power supply variations for gain error cancellation in pulse-width-modulated motor controllers
  • Inhibition of power supply variations for gain error cancellation in pulse-width-modulated motor controllers

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Embodiment Construction

[0027] The present invention will be described in connection with its preferred embodiment, that is, as it is implemented into a drive circuit for a voice coil motor in a modern computer disk drive system, since the advantages provided by the present invention are expected to be particularly beneficial for such applications. However, other applications of the invention are also contemplated to advantage, and such applications will be apparent to those skilled in the art in view of this specification.

[0028] Figure 3 generally depicts a disk drive system 10 constructed in accordance with a preferred embodiment of the present invention. Disk drive system 10 includes one or more magnetic media disks 12 that are rotated by a spindle motor 14 that is responsive to a spindle driver circuit 16 . Data sensor 18 is the read / write head of disk drive system 10 and is placed at the end of positioning arm 17 . In the case of multiple disks as shown in FIG. 1, a plurality of positioning ...

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Abstract

A positioning driver (32) for a voice coil motor (22) in a disk drive system is disclosed. Pulse-width-modulated prestage drivers (46) are coupled to power transistors (50PH, 50NH, 50PL, 50NL) arranged in an 'H' bridge for driving the voice coil motor (22), biased with a power supply voltage (VM). The pulse-width-modulated prestage drivers (46) drive the power transistors (50PH, 50NH, 50PL, 50NL) according to a comparison between an error signal from an error amplifier (36) and a ramp clock signal (RMP) generated by a ramp clock generator (48). The ramp clock generator (48) includes a control circuit that modulates the high and low limits of the ramp clock signal (RMP) in response to variations in the power supply voltage (VM). This modulation of the high and low limits compensates for variations in the gain of the power transistors (50) resulting from variations in the power supply voltage (VM). The control circuit may also modulate the slope of the ramp clock signal (RMP) according to variations in the power supply voltage (VM), for example to maintain a constant frequency.

Description

technical field [0001] This invention relates to the field of motor control, and more particularly to the control of voice coil motors for computer disk drive controllers. Background technique [0002] As is evident in the industry, disk drives or drives remain the primary technology for mass read / write storage in modern computers, including desktop workstations and portable "laptop" computers. Disk drives are also popular today in smaller portable systems such as portable audio systems and players. [0003] Modern disk drives typically include a "spindle" motor and a "voice coil" motor. During operation, the spindle motor spins the disk so that a certain radius of the disk's sectors pass the data sensor, or read / write "head". A "voice coil" motor positions the data sensor at a radial position on the disk surface that corresponds to the track position from which data is read or written. The data sensor is typically located at the distal end of a positioning arm that rotat...

Claims

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Application Information

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IPC IPC(8): G11B5/596
Inventor A·Y·依尔－切瑞夫E·F·普路托斯基K·W·则迈
Owner TEXAS INSTR INC
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