KR101682878B1 - The variable capacitor module and the method for controlling that - Google Patents

Abstract

The present invention relates to a variable capacitor having a variable capacitance whose capacitance is changed by changing the facing area of a rotating shaft electrode and a stator electrode, a driving unit configured to rotate a rotating shaft connected to the rotating shaft electrode, a rotating unit rotating together with the rotating shaft, A sensing unit configured to measure a rotation position from the first identification unit and to measure a rotation number of the rotation axis, a target capacitance input unit configured to receive a target capacitance value, to detect a rotation number of the rotation axis sensed by the sensing unit, And a control unit for driving the driving unit to change the capacitance value of the capacitor.
The variable vacuum capacitor according to the present invention has the effect of reducing the cumulative error occurring between the control signal value and the capacitance value so that it is possible to perform precise control even if it is repeatedly used. Even if the power of the equipment is cut off, So that it is possible to perform control based on the final position even when restarting.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a variable capacitor module and a control method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable capacitor module and a control method thereof, and more particularly, to a variable capacitor module having a capacitor whose capacitance value changes according to rotation of a motor and a method of controlling the variable capacitor module.

A capacitor is a basic component of an electric circuit, and a variable capacitor whose capacitance value is changed to control a system including a circuit is often used.

In the case of changing the capacitance value by rotating the rotor, the electrostatic capacity is changed by changing the effective opposing area (EFFECTIVE OVERLAPPING AREA) formed between the stator electrode and the rotating axis electrode.

In general, a motor is used to rotate the rotary shaft electrode, and an encoder for measuring a rotation angle is used to control a capacitance value of a capacitor according to a rotation angle.

However, in the case of the incremental encoder, it can be seen how the axis of rotation of the capacitor moved from the previous position. However, if the initial position is not known, there is a disadvantage that the actual position can not be grasped. There is a problem that the difference in value becomes large. In addition, there is a problem in that when the power supply of the apparatus is turned off, there is no information holding function for the current rotational position, so that the variable capacitor is reset after initialization from the initial value.

Korean Patent Publication No. 1999-029632

The present invention relates to a variable capacitor module and a control method therefor, which can solve the problem that an error is largely generated due to repeated use of the related art, The purpose is to provide.

According to the present invention, there is provided a variable capacitor comprising: a variable capacitor configured to change a capacitance value by changing a facing area of a rotating shaft electrode and a stator electrode; a driving unit configured to rotate a rotating shaft connected to the rotating shaft electrode; A sensing unit configured to measure a rotation position from the first identification unit and to measure a rotation number of the rotation axis, a target capacitance input unit configured to receive a target capacitance value, And a control unit for driving the driving unit to use the information about the position and change the capacitance value of the capacitor.

Meanwhile, the control unit may be configured to drive the driving unit using the trend data of the capacitance value according to the rotational speed and the rotational position.

The trend data can be generated by measuring the actual capacitance value according to the actual rotation angle and the actual rotation frequency.

Furthermore, the first identification unit may include a plurality of patterns spaced at a predetermined angle in the rotation direction so as to provide information on the rotation position, and the sensing unit may include an encoder unit that measures the rotation position of the rotation shaft from the first identification unit. have.

The detection unit may further include a second identification unit for providing information on the number of revolutions, and the sensing unit may further include a counter unit for measuring the number of revolutions of the rotation shaft from the second identification unit.

The first identification unit may be formed in a radial direction of the disk, and the first identification unit may include a unique pattern formed in a unit sector of the disk.

On the other hand, the capacitor may be constituted by a variable vacuum capacitor.

The driving unit may be configured to be rotated by a predetermined angle unit, and the encoder unit may be configured to measure the first identifying unit using the light emitting diode.

Here, the first identification unit, the sensing unit, and the control unit may be provided inside the driving unit.

The method includes the steps of: inputting a target capacitance value; controlling a target rotation position of the rotation axis corresponding to the target capacitance value and a target rotation position of the rotation axis corresponding to the target capacitance value, A position calculating step of calculating the number of revolutions, and a driving step of rotating the rotating shaft by driving the driving part to have the target rotating position and the target rotating speed.

Further, the control method of the variable capacitor module measures the final rotational position and the final rotational frequency after the driving phase, and restarts the driving unit to reduce the error when the error occurs with the target rotational position and the target rotational frequency And the like.

The variable vacuum capacitor module and the control method thereof according to the present invention can reduce the cumulative error occurring between the control signal value and the capacitance value even when it is repeatedly used, so that the durability is high and the control can be precisely performed.

In addition, since the power of the apparatus is cut off, the current rotation angle can be confirmed without storing information about the current rotation number and rotation angle, and the control can be performed based on the current rotation number.

1 is a side view of a first embodiment according to the present invention.
2 is a plan view of a disc according to the present invention.
3 is a control flowchart of the first embodiment according to the present invention.
4 is a control flowchart of the second embodiment according to the present invention.
5 is a side view of a third embodiment according to the present invention.

Hereinafter, a variable capacitor module according to an embodiment of the present invention and a control method thereof will be described in detail with reference to the accompanying drawings. In the following description of the embodiments, the names of the respective components may be referred to as other names in the art. However, if there is a functional similarity and an equivalence thereof, the modified structure can be regarded as an equivalent structure. In addition, reference numerals added to respective components are described for convenience of explanation. However, the contents of the drawings in the drawings in which these symbols are described do not limit the respective components to the ranges within the drawings. Likewise, even if the embodiment in which the structure on the drawing is partially modified is employed, it can be regarded as an equivalent structure if there is functional similarity and uniformity. Further, in view of the level of ordinary skill in the art, if it is recognized as a component to be included, a description thereof will be omitted.

Hereinafter, a first embodiment of the variable-voltage capacitor module according to the present invention will be described with reference to FIGS. 1 to 3. FIG.

1 is a side view of a first embodiment according to the present invention. The variable vacuum capacitor module according to the present invention includes a variable vacuum capacitor 10, a motor 20, an encoder unit 40, a disk 30, a second identification unit 50, a counter unit 60, And may include a support portion 70.

The variable vacuum capacitor 10 is composed of a fixed portion and a rotating shaft. The fixed portion is provided with a fixed electrode, and the rotating shaft is provided with a rotating shaft electrode corresponding thereto. A dielectric ceramic is provided between the rotation axis electrode and the fixed electrode, and the rotation axis electrode is provided facing the stator electrode.

The variable vacuum capacitor 10 changes the opposing effective facing area between the rotation axis electrode and the fixed electrode to change the capacitance value. At this time, a method of rotating the rotating shaft to change the effective facing area is often used. The rotor is configured to have a plurality of rotation ranges to finely change the capacitance value. On the other hand, since the configuration of the variable vacuum capacitor 10 is widely used, a detailed description thereof will be omitted.

The motor 20 is connected to the rotation axis of the variable vacuum capacitor 10 and receives electric power from the outside to transmit the rotational force to the rotation axis so as to change the capacitance value. The motor 20 may include a fixed portion, a rotor, a housing, and the like. The housing constitutes the overall contour of the motor 20 and the rotor is connected to the rotary shaft of the variable vacuum capacitor 10. [ The fixing portion may be provided inside the housing.

The motor 20 may be constituted by a stepping motor 20 that rotates in a specific angle unit corresponding to a predetermined angle of a first identification part 31 to be described later. Since the configuration of the motor 20 is also widely used, the detailed description will be omitted.

The supporting portion 70 is configured to connect and fix the housing of the variable vacuum capacitor 10 and the motor 20, and is provided in each of the four directions.

Although not shown, the motor 20 and the rotary shaft may be directly connected to each other without a separate connection portion to prevent a control error due to twisting when the motor 20 and the rotary shaft are connected. Correspondingly, the support portion 70 may also be constructed somewhat shorter. However, such a configuration is merely an example and can be variously changed.

2 is a plan view of a disc 30 according to the present invention. As shown in the figure, the disc 30 is fixed to the rotor of the motor 20 and rotates together with the rotor, and is formed in a disk shape to provide information about the rotation angle. The first identification portion 31 is provided .

The first identification unit 31 is constituted by a plurality of patterns uniformly spaced in the rotational direction, and is configured to provide information on the rotational angle of the rotational shaft. The first identification unit 31 may have a pattern unique to a unit sector formed by a predetermined unit angle of the disk 30. The inherent pattern is composed of a set of opaque portions that are formed in the disc 30 as transparent portions and arcs. 8 ends are formed from the central portion to the outer diameter of the disk 30. In the case of 8 stages, the number of opaque portions regularly formed in the rotational direction is 2, 2 2, 2 3, 2 4 , 2 ^ 5, 2 ^ 6, 2 ^ 7, and 2 ^ 8. In other words, 256 patterns composed of combinations of these shapes are formed at intervals of about 1.4, so that it is possible to measure the current rotation angle only by recognizing the pattern. However, the structure of such a pattern is merely an example, and it can be configured as a reflection type or a non-reflection type, and the number of the patterns and the number of the stages are also examples and can be variously applied. As an example, a disc 30 that is applied to an absolute encoder may be used.

The encoder unit 40 measures the first identification unit 31 and is configured to recognize a unique pattern disposed at predetermined angular intervals to provide information on the rotation angle. The encoder unit 40 may include a light emitting diode and a sensor. Eight light emitting diodes each having a number corresponding to the number of the ends of the first identification unit are disposed on one side of the disk 30, and eight sensors corresponding to the light emitting diodes are provided on the other side. Therefore, in the pattern according to the current angle of the disk 30, the light emitted from the transparent portion is detected by the sensor, and the digital output is obtained. For example, if the digital output is 1 when the sensor is detected through the transparent part, 0 is the digital output of the sensor that is not detected in the opaque part, and the digital output value of the sensor is 00101111 And the digital output value of the sensor has a unique value of 00110111 when it is located at D2. Since these values have inherent values according to a specific angle, the rotation angle of the disk 30 can be directly measured. However, the configuration of the encoder unit 40 is merely an example, and can be configured to recognize a pattern using various sensors.

The second identification unit 50 is provided in the rotor for measuring the number of rotations of the rotor and the rotary shaft and is rotated together with the rotor. The second identification unit 50 is provided at one side of the rotor so as to generate a signal repeated every rotation.

The counter unit 60 is configured to sense the second identification unit 50 and measure the number of revolutions. The counter unit 60 is fixedly installed and is configured to receive the signal of the second identification unit 50 and to measure the current number of revolutions.

The first identification part 31, the encoder part 40, the second identification part 50 and the counter part 60 are provided integrally with the motor 20 and are provided inside the housing 20 of the closed motor 20 So as to prevent malfunction of the sensor due to external exposure or the like.

Hereinafter, a method of controlling the variable-voltage capacitor module according to the first embodiment will be described with reference to FIG.

3 shows a control procedure of the first embodiment according to the present invention. The capacitance value ranges from 50 to 550 pF and increases by 50 pF per revolution. A control procedure applied to the variable vacuum capacitor 10 having a control range of 10 rotations will be described.

First, the position having the minimum value of 50 pF is set as the home position, and the rotation number is set to 0 and the rotation angle to 0.

When the input value is set to 120pF, the rotation axis is rotated 144 degrees in order to increase the initial value to 50pF by 50pF by one rotation and further by 20pF. That is, the motor 20 is controlled so that the number of rotations obtained by the counter 60 is 1, and the rotation angle obtained by the encoder 40 is rotated to a position of the inherent pattern corresponding to 144 degrees.

The motor 20 is controlled so as to have the corresponding number of revolutions and the rotation angle immediately without calculating the angle to be changed from the previously set capacitance value. Therefore, it is possible to determine the exact position of the rotation axis according to the input without the information on the starting point. In addition, even when a control error occurs, since the error is not reflected in the control to the next position without using the previous position information, errors are not accumulated.

Hereinafter, a control method of the control unit (not shown) will be described.

The control unit (not shown) may be configured to remove the error at the start of the control. Upon receiving the target capacitance value, the initial rotational position and the initial rotational speed of the rotational shaft measured by the encoder unit 40 and the counter unit 60 are measured. The rotation angle for changing to the target capacitance value based on the initial rotation position may be calculated and configured to drive the motor 20 by the calculated rotation angle. In this case, since the capacitor is driven based on the initial position before each drive, it is possible to initialize the error at the start of control.

 In addition, the control unit (not shown) may be configured to remove the control end error. When the target capacitance value is inputted, the motor 20 is driven so as to be the target rotation position and the target rotation number of the rotation axis corresponding to the target capacitance value, and the final position is fed back from the encoder unit 40 and the counter unit 60 And the drive can be terminated at the target position. In such a case, since the target position can be confirmed at the end of each drive, the error at the end of control can be initialized.

In addition, the control unit (not shown) may be configured to eliminate errors both at the start of control and at the end of control. Upon receiving the target capacitance value, the initial rotational position and the initial rotational speed of the rotational shaft measured by the encoder unit 40 and the counter unit 60 are measured. The rotation angle for changing to the target capacitance value based on the initial rotation position may be calculated and configured to drive the motor 20 by the calculated rotation angle. At the end of the driving, the encoder 40 and the counter 60 feedback the final rotational position and the final rotational speed, and can terminate the driving when the target position is reached. In this case, since it is possible to confirm the initial position and the target position at the start and end of each drive, the error can be initialized.

Hereinafter, the control procedure of the second embodiment according to the present invention will be described with reference to FIG.

4 shows a control procedure of the second embodiment according to the present invention. In the second embodiment, the same components as those in the first embodiment can be included, and a description thereof will be omitted in order to avoid redundant description.

The second embodiment according to the present invention may include a control unit (not shown). A control unit (not shown) is configured to control the motor 20 to change the capacitance value of the variable resonance capacitor 10 to a desired value. The control unit (not shown) uses the trend data of the capacitance value corresponding to the rotation angle and the rotation number of the rotary shaft obtained from the encoder unit 40 and the counter unit 60. [ And generates a signal for controlling the motor 20 to have a rotation angle corresponding to a desired input value based on the acquired trend data. On the other hand, the trend data can use the provided data, and the measured value of the actual capacitance value according to the actual rotation position and the actual rotation angle can be used.

In the present embodiment, the variable capacitance capacitor 10 has a capacitance value in the range of 50 to 550 pF and has a control range of 10 rotations.

Prior to the control of the variable vacuum capacitor 10, a matching step of building trend data of the capacitance value of the variable capacitor 10 corresponding to the number of revolutions and the rotation axis is performed. Therefore, it corresponds to the unique number of rotations and the value of the axis of rotation according to the capacitance value.

 The controller 20 controls the motor 20 to move to a position based on the rotation number and the rotation angle corresponding to the input capacitance value using the trend data.

Thereafter, the current rotation angle is confirmed from the encoder unit 40, the current rotation number is confirmed by the counter unit 60, and the movement position is confirmed and the movement is completed.

When such trend data is used, the trend data is generated reflecting the errors existing individually in the variable vacuum capacitors, and since the trend data reflecting the trend data is used, more precise control becomes possible.

5 is a side view of a third embodiment according to the present invention. As shown in the figure, the third embodiment of the present invention includes a first identification unit 31, an encoder unit 40, a second identification unit 50, a counter unit 60, and a controller (not shown) And a gear box 80 may be provided.

The first identification unit 31 and the second identification unit 50 may be provided on the rotary shaft of the variable vacuum capacitor 10. The encoder unit 40 and the counter unit 60 may be provided correspondingly. So that it is possible to minimize the influence of errors due to twisting occurring in the rotor or the like provided on the actual rotation axis of the variable vacuum capacitor 10.

The gear box 80 is provided between the rotor of the motor 20 and the rotary shaft of the variable vacuum capacitor 10 so as to change the rotation ratio of both sides. When the gear ratio of the gear box 80 is low, that is, when the rotation angle of the rotary shaft is lower than the rotation angle of the motor 20, the rotation of the rotary shaft of the variable vacuum capacitor 10 can be controlled more precisely The control precision can be increased. However, since the configuration of the gear box 80 can be variously applied according to the control range of the capacitor and the type of the motor 20, a detailed description of the gear ratio of the gear box 80 will be omitted.

Even when the gear ratio is changed by the gear box 80, the capacitance value corresponding to the rotation angle and the rotation speed of the rotation shaft is uniquely determined. Therefore, the control unit can control the motor 20 so that it can be changed to a desired capacitance value by using the trend data.

As described above, since the variable capacitor module 10 according to the present invention can control the capacitor by using the information about the number of revolutions and the angle of rotation in parallel with the encoder unit 40 and the counter unit 60, Even if the initial value or the value of the previous state is not known, it can be controlled to the correct position. In addition, even if an error occurs due to repeated use, the control can be performed according to the rotation angle and the rotation speed, thereby increasing the reliability of the control.

Further, even when the power of the equipment is cut off, the control of the capacitance value can be carried out with the stability of the rotation angle because the rotation angle can be conserved and the information about the previous position is not required in the control.

In addition, since the error range can be reduced through the gear ratio, the control capability can be improved.

  While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, . Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

10: Variable Vacuum Capacitor
20: Motor
30: Disk
31: First identification unit
40: encoder section
50: Second identification part
60:
70: Support
80: Gearbox

Claims (13)

A variable capacitor configured to change a capacitance value by changing a facing area of the rotating shaft electrode and the stator electrode;
A driving unit configured to rotate a rotation axis connected to the rotation axis electrode;
A first identification unit configured to rotate together with the rotation axis and to provide information on the rotation position of the rotation axis;
An encoder unit configured to measure the rotational position from the first identification unit;
A second identification unit that rotates together with the rotation axis and provides information on the rotation number of the rotation axis;
A counter for measuring the number of revolutions of the rotary shaft from the second identification unit; And
A control unit for receiving the target capacitance value and using the information about the rotation speed and the rotation position of the rotation axis sensed by the encoder unit and the counter unit and for driving the driving unit to change the capacitance value of the capacitor, And a variable capacitor module. The method according to claim 1,
Wherein the control unit drives the driving unit using the trend data of the capacitance value according to the rotation number and the rotation position. 3. The method of claim 2,
Wherein the trend data is generated by measuring an actual capacitance value according to an actual rotation angle and an actual rotation frequency. The method according to claim 1,
Wherein the first identification unit comprises a plurality of patterns spaced at a predetermined angle in the rotation direction to provide information on the rotational position.
delete 3. The method of claim 2,
Further comprising a disk rotating with the rotation axis,
Wherein the first identification unit has a pattern formed in the radial direction of the disk. The method according to claim 6,
Wherein the first identification unit includes a unique pattern formed in a unit sector of the disk. 3. The method of claim 2,
Wherein the capacitor is a variable vacuum capacitor. 3. The method of claim 2,
Wherein the driving unit is configured to be rotated by a predetermined angle unit. 3. The method of claim 2,
The encoder unit uses a light emitting diode
And the first identification unit is measured. 3. The method of claim 2,
Wherein the first identification unit, the encoder unit, and the control unit are provided inside the driving unit. A method of controlling a variable capacitor configured to change a capacitance value by changing an area of a counter electrode between a rotating shaft electrode and a stator electrode,
An input step of receiving a target capacitance value;
A position calculation step of calculating a target rotation position and a target rotation number of a rotation axis corresponding to the target capacitance value; And
And driving the driving unit to rotate the rotation shaft so as to have the target rotation position and the target rotation speed. 13. The method of claim 12,
And a restarting step of restarting the driving unit so as to reduce the error when an error is generated with respect to the target rotation position and the target rotation speed by measuring a final rotation position and a final rotation number after the driving step, Control method of module.

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