KR0183294B1 - A spindle motor control method for reducing power - Google Patents

Abstract

Technical Field [0001] The present invention relates to a spindle motor control method for reducing power consumption of a disc drive recording apparatus.

The present invention is to provide a spindle motor control method that can reduce the power consumption by temporarily turning off the current applied to the spindle motor in the acceleration and deceleration section of the actuator in the seek mode of the disk drive recording apparatus.

3. Summary of Solution of the Invention: By using the law of inertia, the current level required for the constant speed rotation or temporarily interrupting the current applied to the spindle motor for the constant speed rotation in the section in which the movement speed of the actuator is accelerated and decelerated. The power consumption can be reduced by temporarily applying a smaller current level.

4. Significant use of the invention: Can be used to control the spindle motor to reduce the power consumption of the disc drive recorder.

Description

Spindle motor control method to reduce power consumption.

1 is a block diagram of a general hard disk drive.

2 is a characteristic diagram of the speed change of the actuator in the search mode.

3 is a characteristic diagram of current change applied to a voice coil motor (VCM) in a search mode.

4 is a flow chart of the spindle motor control according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor control for rotating a recording medium of a disc drive recording apparatus at constant speed, and more particularly to a spindle motor control method for reducing power consumed in a search mode.

Hard disk drive, which is a disk drive recording device, is a device for recording data on a rotating disk or reading data recorded on a disk. As a secondary memory device of a computer system, a large amount of data can be accessed at high speed. It is widely used.

1 is a block diagram of a general hard disk drive. In FIG. 1, the disk 10 is rotated by a spindle motor 32 and records data transmitted from the host computer in a magnetic form. The head 12 is located on the corresponding one of the disks 10 and faces the disks from the E-block assembly 14 coupled with a rotary voice coil motor (VCM) 28. It is installed to correspond to each of the support arms extending toward 10). The preamplifier 16 preamplifies the signal picked up by one of the heads 12 at the time of data read and applies the analog read signal to the read / write channel circuit 18, and the data write. Encoded Write Data (EWD) applied from the read / write channel circuit 18 is driven to drive the corresponding one of the heads 12 to be written on the disc. At this time, the preamplifier 16 selects one of the heads 12 under the control of the DDC (Dick Data Controller) 34 controlled by the microcontroller 22. The read / write channel circuit 18 detects and decodes a data pulse from a read signal applied from the preamplifier 16 to generate read data RDATA, and decodes the write data WDATA applied from the DDC 34 to decode the preamplifier ( 16). The read / write channel circuit 18 also demodulates head position information which is part of the servo information recorded on the disk to generate a position error signal (PES). PES generated from the read / write channel circuit 18 is applied to an analog-to-digital converter 20, and the A / D converter 20 sets the PES to a digital step value corresponding to its level. The microcontroller 22 converts the data to the microcontroller 22. The DDC 34 is controlled by the microcontroller 22 and writes data received from the host computer onto the disk 10 via the read / write channel circuit 18 and the preamplifier 16 or the disk 10. Data is read from the image and sent to the host computer. The DDC 34 also interfaces the communication between the host computer and the microcontroller 22. The microcontroller 22 controls the DDC 34 in response to read or write commands received from the host computer and controls track searching and track following. At this time, the microcontroller 18 controls the track tracking as described above using the PES value applied from the A / D controller 20. The microcontroller 22 includes a ROM having a control program of a hard disk drive and a RAM for temporarily storing data generated during a control operation. The digital-to-analog converter (D / A) 24 converts the control value U for position control of the heads 10 generated from the microcontroller 22 into an analog signal. The VCM driver 26 generates a driving current I (t) for driving the actuator by a signal applied from the D / A converter 24 and applies it to the VCM 28. The VCM 28 horizontally moves the head 12 on the disks 10 in response to the direction and level of the drive current input from the VCM driver 26. The spindle motor driver 30 rotates the disks 10 by driving the spindle motor 32 in accordance with a control value for the rotation control of the disk 10 generated from the microcontroller 22.

In the conventional hard disk drive having the above-described configuration, track search and track following must be performed to write data to a predetermined track or to read specific data from a predetermined track. In this case, in the conventional hard disk drive, the power consumption amount is controlled by continuously applying a predetermined level of current to the spindle motor 32 and the VCM 28 in the track search mode to control the constant rotation of the disk 10 and the horizontal movement of the actuator. There was an increasing problem.

Accordingly, an object of the present invention is to provide a spindle motor control method capable of reducing power consumption by temporarily turning off the current applied to the spindle motor in the acceleration / deceleration section of the actuator in the track search mode of the disc drive recording apparatus.

The present invention for achieving the above object is a spindle motor control method for reducing the power consumption of the disk drive recording apparatus, the process of checking the moving speed of the actuator when the spindle motor rotates at constant speed in the search mode, and the check In the acceleration and deceleration section of the actuator when the actuator is characterized in that the process is made to turn off and then re-drive the spindle motor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, numerous feature details, such as specific process flows, are shown to provide a more general understanding of the present invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

FIG. 2 shows a characteristic diagram of a change in the movement speed of the actuator in the seek mode, and FIG. 3 shows a characteristic diagram of the current change applied to the Voice Coll Moror 28 in the search mode. First, when the microcontroller 22 needs to move the head 12 to the target track in response to the data read / write command received from the host computer, the microcontroller 22 must control the moving speed of the actuator as shown in FIG. Referring to FIG. 2, first, the microcontroller 22 accelerates and controls the movement speed of the actuator from the track A in which the head 12 is currently located to the track B (the constant speed section), and the actuator from the track B to the track C. The movement speed of the actuator is controlled at constant speed (registration section), and the movement speed of the actuator is reduced (deceleration section) from track C to track D. 3 shows changes in the current direction and the current level applied to the VCM 28 under the control of the microcontroller 22. That is, the current applied to the VCM 28 in the acceleration section is a positive (+) direction current having the current level of E level, and the current applied to the VMC 28 in the constant velocity section is the amount having a small current level of F level ( The current is applied in the +) direction, and the current applied to the VCM 28 in the deceleration section is the reverse (-) current of the G level. In FIG. 3, the current direction and the acceleration / deceleration section may vary according to the search direction of the actuator.

4 is a flowchart illustrating a control flow of the microcontroller 22 according to a temporary embodiment of the present invention. Hereinafter, a control process of the spindle motor 32 for reducing power consumption will be described with reference to FIGS. 1 and 4. Shall be. First, the microcontroller 22 checks whether the search mode is received in step 40 when a command for reading data written in a predetermined track is received from the host computer or a command for writing data on a predetermined track is received.

If the inspection result is a search mode for searching a predetermined track, the microcontroller 22 proceeds to step 42 to check whether the spindle motor 32 rotates at a constant speed. As a result of the inspection, when the spindle motor 32 does not rotate at a constant speed, the microcontroller 22 proceeds to step 50 and controls the spindle motor 32 at constant speed, and then proceeds to step 48. On the other hand, when the check result of step 42, the spindle motor 32 is rotated at constant speed, the microcontroller 22 proceeds to step 44 to check whether the movement speed of the actuator is accelerating and decelerating. That is, it is checked whether the actuator is located in the acceleration / deceleration section. If the actuator is located within the acceleration / deceleration section as a result of step 44, the microcontroller 22 proceeds to step 46 to temporarily stop the spindle motor 32 in constant speed, and then control the constant speed drive again. Thereafter, the microcontroller 22 checks whether the track search is completed in step 48 and switches to the track following mode when the search is completed to control the head 12 on-track. On the other hand, if the track search is not completed as a result of step 48, the process returns to step 40 and repeats the above steps 40 to 46. As an example of the case where the track search is not completed, when the actuator moves from the current track to the target track, it is necessary to pass through the constant speed section and the deceleration section sequentially after the initial acceleration section, and thus, the above-described steps 40 to 48 for all track searches are performed. This results in repeating the step twice. Therefore, when the actuator is located in the acceleration / deceleration section, the power consumption can be reduced by reducing the amount of current applied to the spindle motor 32 by temporarily stopping the spindle motor 32. Even if the current applied to the spindle motor 32 is interrupted in the acceleration / deceleration section of the actuator, the spindle motor 32 may maintain the rotational motion for a predetermined time by the law of inertia.

Meanwhile, the above-described control process of the spindle motor 32 should be performed at every servo control, and continuously monitoring the rotation of the spindle motor 32 to temporarily block the current applied to the spindle motor 32 in the actuator acceleration / deceleration section. Alternatively, power consumption may be reduced by applying a current having a level smaller than that of a prescribed level required for constant speed rotation of the spindle motor 32.

As described above, the present invention has the advantage of reducing the amount of power continuously consumed by temporarily interrupting the current applied to the spindle motor in the section in which the actuator is accelerated and decelerated in the track search mode.

Claims (3)

A spindle motor control method for reducing power consumption of a disc drive recording device, comprising: a first process of checking a moving speed of an actuator when the spindle motor rotates at a constant speed in a seek mode; and in an acceleration and deceleration section of the actuator during the checking Spindle motor control method comprising the step of turning off the spindle motor in constant speed rotation and then re-drive. The method of claim 1, wherein the first process and the second process are performed at every servo control. A spindle motor control method for reducing power consumption of a disc drive recording apparatus, the method comprising: a first process of checking a moving speed of an actuator when the spindle motor rotates at a constant speed in a seek mode; The second process of temporarily blocking the current of the prescribed level required for the constant speed rotation of the spindle motor in the section and re-applying, and the request for the constant speed rotation of the spindle motor in the section in which the movement speed of the actuator is reduced And a third process of temporarily applying a current of a level smaller than a current of a specified level and then reapplying a current of a specified level.