KR100257193B1 - Slider motor operation voltage control device - Google Patents

Abstract

PURPOSE: A controlling device for a driving voltage of a slide motor is provided to conveniently control the slide motor in track search through programming a slide motor driving voltage and a control start location at each location by using a DSP(Digital Signal Processor). CONSTITUTION: A DSP unit(21) contains a programmed slide motor control method. A D/A(Digital/Analog) converter(22) converts a digital value outputted from the DSP unit into an analog value for driving a motor. A motor drive unit(23) drives a slide motor(24) by using the analog value from the D/A unit. An FG signal generate unit(25) generates an FG signal corresponding to a driving slide motor. A microcomputer(20) programs and controls the DSP unit. Herein, an ROM(26) connected to the DSP unit contains a speed table from the control start location to a target location.

Description

Slide motor drive voltage controller

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk system, and more particularly, to a slide motor driving voltage control apparatus which performs a track search of a disk by programming a control position and a driving voltage of a control position in advance when driving a slide motor.

In general, in order to reach the desired point on the optical disc, the laser beam generated by the pickup must be accurately tracked from the current track to the target track and tracked on the target track. This is called search.

This search operation calculates the number of tracks to the target track, and if the number of tracks to be jumped is hundreds or thousands of tracks or more, the pickup motor is moved near the desired track by moving the slide motor. You will find a track.

At this time, for high speed search, the track jump needs to be fast and accurate and stable.

Conventionally, in order to search for a target position from the inner circumference to the outer circumference, as shown in FIG. 1A, first, the slide driving voltage is raised to a level to drive the slide motor, and then the reverse voltage is applied to the slide motor at the control start position before the target position. have.

If the driving voltage is suddenly set to 0 V at the target position without applying the reverse voltage to the slide motor at the control start position, the pickup connected to the slide shaft stops beyond the target track position due to the movement inertia of the slide motor.

This causes more time to find the target position, which results in longer access time.

To prevent this, the motor is controlled backward from the control start position before the target position so that the pickup stops at the target position.

At this time, in order to stop the pickup at the target position more accurately, the speed acceleration / deceleration is repeated at a predetermined cycle of the slide motor from the control start position to the target position.

On the other hand, Figure 1b is another method of the conventional track search, the drive voltage is linearly reduced from the control start position, the drive voltage is set to 0V at the target position to prevent the track slip of the slide motor.

In the case of moving from the outer circumference to the inner circumference, the above-described case may be reversed.

However, since Fig. 1A and Fig. 1B are difficult to determine the control start position, the control start position and the target position are usually determined by the experimental value, so that the brake motor is braked too late or too early to pick up at the position before or after the target track. The case where this is stopped occurs and therefore the access time becomes late.

In addition, the slide driving voltage is also changed according to the number of tracks to be moved, which causes the microcomputer to set the slide driving voltage every time according to the tracks to be moved, making it difficult to control the slide motor.

That is, the microcomputer checks and determines the control start position or the control voltages instantaneously by counting the number of frequency generation (FG) signals generated in proportion to the rotational speed from the motor and calculating the number of moving tracks. Dependence and burden becomes too high.

The higher the dependence and burden of the microcomputer, the slower the processing speed of the microcomputer, and the longer the access time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to use a digital signal processor (DSP) to pre-program a slide motor driving voltage and a control start position at each position to track search. The present invention provides a slide motor driving voltage control device that facilitates control of a slide motor without controlling the microcomputer.

Another object of the present invention is to set up a plurality of control points when reducing the driving voltage from the control start position to the target position, check the FG period at each control point to accelerate and decelerate the driving voltage, thereby making accurate and fast track search. The present invention provides a slide motor driving voltage control device.

A characteristic of the slide motor driving voltage control apparatus according to the present invention for achieving the above object is a DSP unit programmed with various data used for track search and a slide motor control method using the data, and output from the DSP unit. A motor driver for driving the slide motor by converting the slide motor driving voltage into an analog value, and an FG signal generator for generating an FG signal corresponding to the slide motor when the slide motor is driven and outputting the FG signal to the DSP unit; And a microcomputer for programming and controlling the DSP unit.

1A is a waveform diagram illustrating a first example of a slide motor driving voltage control process in a conventional track search;

1B is a waveform diagram illustrating a second example of a slide motor driving voltage control process in a conventional track search;

2 is a block diagram of a slide motor driving voltage control apparatus according to the present invention;

3 is a waveform diagram illustrating a control process of a slide motor driving voltage during track search according to the present invention;

Explanation of symbols for main parts of the drawings

20: Micom 21: DSP unit

22: digital / analog converter 23: motor drive unit

24: slide motor 25: FG signal generator

26: Roman

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram illustrating a slide motor driving voltage control apparatus according to the present invention. In the search, a DSP unit 21 in which a slide motor control method is programmed and a digital value output from the DSP unit 21 may drive a motor. Digital / Analog (A / D) converter 22 for converting an analog value to a digital value, and a motor driver 23 for driving the slide motor 24 with an analog value output from the D / A converter 22. ), An FG signal generator 25 generating a corresponding FG signal when the slide motor 24 is driven, and a microcomputer 20 for programming and controlling the DSP unit 21.

The ROM 26 connected to the DSP unit 21 includes a speed table from a control start position to a target position, which determines, in advance, an accurate and fast control by reducing the driving voltage at a rate through experiments. The determined speed data is programmed and embedded.

The DSP unit 21 has a plurality of registers (not shown) for implementing the present invention.

That is, the initial drive voltage of the slide motor 24 is set in the register. This initial drive voltage varies depending on the number of moving tracks to be searched and is set in advance for each step by experiment.

The number of FG signals up to the target position is stored in the register. This is the number of FG signals generated when the slide moves from the current position to the target position. The FG signal is calculated from the current time and the target time, and is updated each time a search command is input.

The control start position is set in the register. That is, a percentage of the number of FG signals at the target position set in the ⓑ register is set as the control start position. For example, if the number of FGs to the target position is 1000 and the control start position is set to 10%, the number of FGs of the control start position is set to 900, and when the counted FG number is 900, the driving voltage of the slide motor 24 is reached. Control begins.

In the ⓓ register, the slope of the control voltage for controlling the driving of the slide motor is set as shown in FIG.

At least one control point is set in the register. That is, the number of control points from the control start position to the target position is set. In this case, the higher the number of the set control points, the higher the accuracy and the resolution.

When the control drive voltage is 0V, that is, the period of the FG signal at the target position is set in the register, which is the c position of FIG.

Here, it is set in advance by the control and experiment of the microcomputer 20 except for the ⓑ register.

Therefore, when a search command is input, the DSP unit 21 outputs the value stored in the register to the D / A converter 22 and converts it into an analog value.

The converted analog value drives the slide motor 24 through the motor driver 23.

When the slide motor 24 is driven, the FG signal generator 25 mounted on the motor 24 generates an FG pulse for speed control, and the DSP unit 21 counts the number of input FG signals.

That is, the FG signal generator 25 generates magnetic pulses from a plurality of magnetic poles superimposed on the main magnet by a Hall element into voltage.

At this time, the DSP unit 21 counts the FG signal and detects the control start position. The DSP unit 21 compares whether the counted FG number is equal to the FG number stored in the © register, and if it is not the same, continues to count until it is the same. Since the position becomes the control start position, the drive voltage of the slide motor 24 is lowered. At the same time, save the FG cycle.

That is, when the control start position is reached, since the slope of each control point is set in the ⓓ register, the driving voltage of the slide motor 24 is lowered by the value set in the ⓓ register and outputted to the D / A converter 22.

Therefore, the motor drive unit 23 drives the slide motor 24 with the downed analog voltage, and the DSP unit 21 checks the control point position set in the ⓔ register while continuously counting the FG pulses.

The DSP unit 21 controls the driving voltage of the slide motor 24 by detecting the FG cycle for each control point set in the ⓔ register.

That is, when the control point set in the ⓔ register is detected, the corresponding speed table is selected from the ROM 26 using the FG period stored at the control start position and the FG period of the target position stored in the ⓕ register, and the motor set in the speed table is selected. Compare the movement speed with the movement speed at the current control point.

At this time, if the FG frequency of the current control point is large, the FG pulse is coming in too fast. Therefore, the driving voltage is lowered to increase the control voltage slope to further reduce the speed. This is like applying a brake suddenly. If the FG frequency is small, the control voltage is maintained as it is.

This process is repeatedly performed for each control point set in the ⓔ register, and when the target position is reached, the driving voltage is set to 0V and output to the D / A converter 22.

Therefore, the pickup speed stops accurately at the target position without slipping, thereby increasing the access speed.

At this time, the microcomputer 20 is necessary only when presetting the value in the register built in the DSP 21, and is rarely used during the track search.

Therefore, there is no burden on the microcomputer to check and control the control position or the control voltage at an instant, so that the search speed becomes faster.

As described above, according to the slide motor driving voltage control apparatus according to the present invention, the slide driving voltage and the control start position at each control position are programmed in advance by using a DSP to control the slide motor without controlling the microcomputer during track search. By performing the high speed track search, the motor control is easy.

In addition, when the driving voltage is decreased from the control start position to the target position, a plurality of control points are set, and the FG cycle at each control point is checked to adjust the slope of the driving voltage, thereby accurately stopping the pickup at the target position and accessing it. Time is faster.

Claims (5)

In the slide motor driving voltage control device for driving the slide motor to move the pickup to the target track, A digital signal processor which presets the slide motor driving voltage at each control position and the control position at the time of track search and controls the driving of the slide motor by using the set value and the input frequency generation (FG) signal; A motor driver for driving the slide motor by converting the slide motor driving voltage output from the digital signal processor into an analog value; An FG signal generator mounted on the slide motor to generate a corresponding frequency generation (FG) signal when the slide motor is driven and output to the digital signal processor; And a microcomputer to program and control the digital signal processor. The digital signal processor of claim 1, wherein the digital signal processor includes: Slider drive voltage control device characterized in that the ROM storing the speed data corresponding to a specific position from the control start position to the target position. The digital signal processor of claim 1, wherein the digital signal processor A register in which the initial driving voltage of the slide motor is set, a register in which the number of FG signals to a target position are stored, a register in which the control start position is set, and a slope of a control voltage for controlling the driving of the slide motor when the driving voltage is down is set. Registers, registers in which at least one control point is set, and registers in which the FG signal period at the target location is set, and are controlled by the microcomputer except for the registers in which the number of FG signals to the target location is stored. Slide motor drive voltage control device characterized in that the preset. 4. The digital signal processor of claim 3, wherein the digital signal processor When a search command is input, the slide motor is driven with the initial driving voltage stored in the register, and the FG pulse generated at this time is counted to determine the control start position. From the determined control start position, the drive voltage is decreased by the value set in the register. Slide motor drive voltage control device characterized in that the drive voltage is reduced to 0V when the FG pulse is counted to reach the target position. The method of claim 4, wherein the digital signal processing unit At least one control point is set in the register from a control start position to a target position, and the deceleration slope of the control point is adjusted by comparing the period of the FG frequency at each control point with a value stored in the ROM. Slide motor drive voltage control device.

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