KR20180024207A - Apparatus for selecting noise filter including the tunable elements - Google Patents

Abstract

The present invention relates to a noise filter selection device including a tunable element, capable of maximizing a noise removing effect. In particular, the device comprises: input and output terminal units (10, 20) connected to input and output terminals of a device generating noise, respectively; a noise filter unit (100) including noise filters (110 to 170) with a preset circuit configuration to filter the noise inputted through the input terminal unit (10); a switch unit (200) including a filter selection switch (210) to select any one of the noise filters (110 to 170) of the noise filter unit (100); a tunable element unit (300) including a plurality of tunable elements (310 to 360) varying characteristics of elements forming the noise filters (110 to 170) of the noise filter unit (100); and an output unit (400) including a first display unit (410) to display the noise inputted through the input terminal unit (10) as a signal waveform and a second display unit (420) to display the noise, which is filtered by the noise filter unit (100) and is outputted through the output terminal unit (20), as a waveform.

Description

TECHNICAL FIELD [0001] The present invention relates to a noise filter including a tunable element,

The present invention relates to an apparatus for selecting a noise filter including a variable element, and more particularly, to an apparatus and method for selecting a noise filter by selecting an optimal noise filter according to characteristics of electromagnetic noise generated in an industrial field, And more particularly, to a noise filter selection device including a variable element that can easily change the elements constituting the noise filter and maximize the noise removal effect.

Generally, electromagnetic noise refers to unnecessary or harmful noise generated in an electric or electronic equipment installed in an industrial field. It refers to an internal noise generated in various parts installed inside the electric and electronic equipment, There is an external noise such as a sparking phenomenon which occurs when the light emitting diode is inserted.

For example, in an electric motor, high frequency noise generated by a switching element of a drive is inevitably accompanied by such electromagnetic noise, which interferes with data input / output between a control, a measuring instrument, and a control object to input / output an erroneous value, .

Accordingly, in order to attenuate or eliminate electromagnetic noise, a noise filter has been developed, and a noise filter has to be selected according to the characteristics of electromagnetic noise generated in an industrial field to be used, Can not be calculated.

For this reason, current noise filters are being manufactured in a general manner, and there is a limitation in that all the electromagnetic noise in the industrial field can not be removed by a single selected noise filter.

In addition, the conventional noise filter is limited to the elimination of power supply noise, and the LPF or HPF filter is constructed by using a fixed value of inductance and capacitance elements to block the noise. In the power noise, however, all frequency bands It is impossible to effectively block a noise signal in a desired frequency band.

That is, there is a disadvantage in that a frequency that can be blocked is determined through a noise filter constructed using resistors, inductances, and capacitance elements having fixed values, and the range that can be used (applied) is limited.

In this regard, in the domestic patent No. 10-1080863 (registered on November 11, 2011, entitled "Fault-Sensing Noise Filter of Industrial Harmonic Heater", hereinafter referred to as Prior Art 1), in the 30 MHz to 1 GHz band A failure detection function is added between the magnetrons provided with the noise filter for shielding and attenuating the radioactive and conductive noise and the high voltage transformer applying the high voltage to the magnetron respectively so that a plurality of magnetrons and high voltage transformers A fault detection type noise filter for an industrial high frequency heater is disclosed which can accurately recognize which component in an industrial high frequency heater has been broken down to greatly reduce the time and expense required for maintenance and greatly improve reliability.

As described above, the prior art document 1 is configured to remove noise on a fixed value, and the problem that the usable range is limited is included as it is.

Domestic Patent Patent No. 10-1080863 (Registered: November 11, 2011, Name: Fault-Sensing Noise Filter of Industrial High Frequency Heater)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide an apparatus and method for selecting an optimal noise filter to remove noise according to characteristics of electromagnetic noise generated in an industrial field The present invention also provides a selection device for a noise filter including a variable element which further includes a variable element to easily change the elements constituting the noise filter and maximize the effect of removing noise.

An apparatus for selecting a noise filter including a variable element according to an embodiment of the present invention includes input and output terminal units 10 and 20 connected to input and output terminals of a device that generates noise, A noise filter unit 100 provided with filters 110 to 170 for filtering noise inputted through the input terminal unit 10 and a noise filter 110 to 170 of the noise filter unit 100 A switch unit 200 including a selected filter selection switch 210 and a plurality of tunable elements (not shown) for varying the characteristics of elements constituting the noise filters 110 to 170 of the noise filter unit 100 A first display part 410 for displaying the noise inputted through the input terminal part 10 in the form of a signal waveform, a second display part 410 for outputting the noise through the output terminal part 20, And a waveform output unit 400 including a second display unit 420 for displaying the noise filtered by the noise filter unit 100 as a signal waveform.

The selection device of the noise filter including the variable element may further include selection means for selecting any one of the noise filters 110 to 170 of the noise filter unit 100 selected by the filter selection switch 210 of the switch unit 200. [ And a filter display unit (500) including filter display means (510 to 570) for indicating whether or not the filter is displayed.

The input terminal portion 10 includes a positive terminal 11, a negative terminal 12 and a ground terminal 13. The output terminal portion 20 includes a positive terminal 21, (-) terminal 22 and a ground terminal 23, as shown in Fig.

Furthermore, the switch unit 200 may further include a power selection switch 220 for selecting a DC power source or an AC power source.

In addition, the switch unit 200 may further include a ground selection switch 230 for selecting either a grounding mode or a grounding mode depending on whether the device uses a grounding wire.

The apparatus for selecting a noise filter including the variable element of the present invention having the above-described structure can remove noise by selecting an optimal noise filter according to characteristics of electromagnetic noise generated in an industrial field, Further, it is possible to optimize the characteristics of the set noise filter in real time, and to completely remove the noise.

This makes it possible to prevent malfunction and malfunction of the electromagnetic equipment due to electromagnetic noise.

In addition, since the signal waveform before and after filtering can be monitored in real time, the administrator can confirm the noise elimination state in real time, and reliability of the noise filter selection apparatus including the variable element of the present invention can be enhanced.

1 is a perspective view showing an apparatus for selecting a noise filter including a variable element according to an embodiment of the present invention.
FIG. 2 is a configuration diagram showing a selection device of a noise filter including a variable element according to an embodiment of the present invention.
3 is a configuration diagram illustrating a noise filter circuit that can be selected through a selection device of a noise filter including a variable device according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus for selecting a noise filter including a variable element according to the present invention will be described in detail with reference to the accompanying drawings. The following drawings are provided as examples for allowing a person skilled in the art to sufficiently convey the idea of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms. In addition, like reference numerals designate like elements throughout the specification.

In this case, unless otherwise defined, technical terms and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the following description and the accompanying drawings, A description of known functions and configurations that may unnecessarily obscure the description of the present invention will be omitted.

1 and 3, an apparatus for selecting a noise filter including a variable element according to an embodiment of the present invention includes input and output terminal units 10 and 20, a noise filter unit 100, a switch unit 200 A variable element unit 300, and a waveform output unit 400, and can be connected to electromagnetic equipment used in an industrial field to remove noise generated in the electromagnetic equipment.

To learn more about each configuration,

The input terminal portion 10 includes a positive terminal 11, a negative terminal 12 and a ground terminal 13. The output terminal portion 20 is also connected to the positive terminal 21, A terminal 22 and a ground terminal 23.

The input terminal unit 10 is connected to a ground line of an electromagnetic device (battery electronic device) that generates electromagnetic noise in an industrial field,

The output terminal unit 20 can interface noise-filtered data with a user-desired measuring device.

The noise filter unit 100 includes noise filters 110 to 170 having a predetermined circuit configuration, that is, as shown in FIG. 2, the first noise filter 110, the second noise filter 120, A noise filter 130, a fourth noise filter 140, a fifth noise filter 150, a sixth noise filter 160 and a seventh noise filter 170 are installed, The noise inputted through the input terminal unit 10 can be filtered using the noise filter.

For a detailed description of each noise filter,

2, the first noise filter 110 simply connects the input terminal portion 10 and the output terminal portion 20 via a relay (not shown) without any other passive element.

The second noise filter 120 connects the input terminal portion 10 and the output terminal portion 20 with a relay (not shown) and a resistor R as shown in FIG.

The third noise filter 130 connects the input terminal portion 10 and the output terminal portion 20 via a relay (not shown) and a capacitor C1 as shown in FIG.

At this time, the capacitor C1 is preferably connected in parallel.

2, the fourth noise filter 140 connects the input terminal unit 10 and the output terminal unit 20 via a relay (not shown), and the input terminal unit 10 includes an inductor L1, The inductor L2 is connected in series and the output terminal 20 is connected in parallel through the capacitor C1.

2, the fifth noise filter 150 connects the input terminal unit 10 and the output terminal unit 20 via a relay (not shown), and the input terminal unit 10 includes an inductor L1, The inductor L2 is connected in series and the output terminal 20 is connected in parallel through two capacitors C1 and C2 connected in series.

The sixth noise filter 160 connects the input terminal portion 10 and the output terminal portion 20 through a relay (not shown), an inductor L1 and a capacitor C1 as shown in FIG. 2 At this time, it is preferable that the capacitors C1 are connected in parallel.

2, the seventh noise filter 170 connects the input terminal portion 10 and the output terminal portion 20 by a relay (not shown), and the output terminal portion 20 is connected to the input terminal portion 10 and the inductor L1 connected in series with the input terminal unit 10 and the inductor L1, the capacitor C1, the inductor L2 and the capacitor C2 are connected in series.

Any one of the noise filters can be selected through the switch unit 200.

1 and 3, the switch unit 200 may include a filter selection switch 210, a power selection switch 220, and a ground selection switch 230.

As described above, when the user selects one of the first noise filter 110, the second noise filter 120, the third noise filter 130, the fourth noise filter 140, the fifth noise It is possible to select a noise filter of any one of the filter 150, the sixth noise filter 160 and the seventh noise filter 170 and to filter the noise input through the input terminal unit 10 using the selected noise filter can do.

At this time, the first noise filter 110 can determine whether the selection device of the noise filter including the variable device according to the embodiment of the present invention operates normally.

That is, since the first noise filter 110 has no element structure as described above, when the noise filter selecting apparatus including the variable element according to an embodiment of the present invention operates normally, the inputted noise is filtered Without outputting it. Accordingly, it is possible to determine whether or not the selection device of the noise filter including the variable device according to the embodiment of the present invention operates normally.

The power source selection switch 220 may be a DC power source or an AC power source. In detail, when the direct current power source is selected, it means that the AC power source is not secured in the industrial field, and the power source is applied from the battery built in the noise filter selecting device including the variable device according to the embodiment of the present invention .

When AC power is selected, a power plug is connected to a power outlet provided at an industrial site to apply power. At this time, it is preferable to operate the constant voltage DC supply so that the DC converted power is finally applied to the internal circuit .

The ground selection switch 230 may be selected as a grounding mode or a grounding mode depending on whether or not the grounding line of the electromagnetic equipment (equipment) generating the noise is used.

The grounding line of the electromagnetic equipment is connected to the ground terminal 13 of the input terminal unit 10 and the ground line of the electromagnetic equipment connected to the input / output terminal unit 10, 20 depending on the use of the grounding line of the electromagnetic equipment generating the electromagnetic noise connected to the input / When connected to the ground terminal 23 of the terminal unit 20, the ground selection switch 230 is selected as the grounding mode.

The variable element unit 300 includes a plurality of tunable elements 310 for varying the characteristics of the passive elements R, L and C constituting the noise filters 110 to 170 of the noise filter unit 100, To 360).

1 and 3, the variable element unit 300 varies characteristics of R, L1, L2, L3, C1, and C2, which are passive elements of the noise filters 110 to 170 , The filter can be controlled under optimum conditions according to the noise.

At this time, the variable elements 310 to 360 can be adjusted by a manager using a tool such as a small driver if necessary, so that the characteristics of elements constituting the noise filters 110 to 170 can be varied.

The waveform output unit 400 may include a first display unit 410 and a second display unit 420 as shown in FIGS. 1 and 3. As shown in FIG. 1, May be installed in the main body of the noise filter selecting apparatus including the variable element according to an embodiment of the present invention, but may be output using an oscilloscope or a terminal monitor used in an industrial field.

The noise can be easily checked by the administrator by comparing the signal waveforms output from the first display unit 410 and the second display unit 420. In this way, The reliability of the selection device of the noise filter including the noise filter can be improved.

The first display unit 410 of the waveform output unit 400 displays the noise inputted through the input terminal unit 10 as a signal waveform. In other words, the signal waveform output through the first display unit 410 is a signal waveform including noise before passing through the noise filters 110 through 170.

The second display unit 420 of the waveform output unit 400 displays the noise filtered by the noise filter unit 100 output through the output terminal unit 20 as a signal waveform. That is, the signal waveform output through the second display unit 420 is a signal waveform through which noise is removed through any one of the noise filters 110 to 170.

Accordingly, the manager can compare the signal waveforms output through the first display unit 410 and the second display unit 420 to check the actual noise removal state, thereby enhancing the reliability of the operation.

In addition, the signal waveform output through the second display unit 420 of the waveform output unit 400 may be changed in accordance with the degree of noise removal while passing through any one of the noise filters 110 to 170, It is preferable that a direct current signal of a straight line shape is displayed from this highly irregular waveform.

That is, the closer the signal waveform output through the second display unit 420 of the waveform output unit 400 is to the straight line, the more the optimal noise filter is selected.

According to an embodiment of noise reduction of a noise filter selected by a noise filter selection apparatus including a variable element according to an embodiment of the present invention,

The first noise filter 110 is effective for eliminating inductive voltage noise caused when the ground potential between the electromagnetic equipment is unequal when the ground mode is selected in the ground selection switch 230.

When the grounding mode is selected at the ground selection switch 230, the second noise filter 120 may convert the inductive current noise between the negative (-) signal and the ground, resulting from the inequality of the ground potential between the electromagnetic equipments, R) by the exothermic action.

The third noise filter 130 removes irregular surge noise generated when the ground potential of the electromagnetic equipment is unequal when the grounding mode is selected in the ground selection switch 230, It is effective to remove the surge noise introduced between the (+) signal and the (-) signal when the grounded mode is selected in the step 230.

When the grounding mode is selected by the ground selection switch 230, the fourth noise filter 140 removes noise mixed with the high frequency noise and the surge noise introduced through the ground line, Noise mode in which the high frequency noise and the surge noise introduced between the (+) signal and the (-) signal are mixed is effectively removed.

The fifth noise filter 150 is a typical low-high filter when the grounding mode is selected by the ground selection switch 230 so as to eliminate all of the low frequency or high frequency introduced into the electromagnetic equipment And when the ground selection mode is selected by the ground selection switch 230, it takes a form of a filter similar to the fourth noise filter 140, but is effective for eliminating the surge noise with a small amplitude.

The sixth noise filter 160 is effective for noise reduction and high frequency attenuation for the normal mode noise (symmetric noise) with respect to the common mode noise (asymmetric noise).

The apparatus for selecting a noise filter including a variable element according to an embodiment of the present invention can select an optimal noise filter 110 to 170 according to a characteristic of electromagnetic noise generated in an industrial field, And variable elements 310 to 360 capable of varying the characteristics of the passive elements (R, L1, L2, L3, C1, C2) constituting the noise filter, The elements can be easily varied, and the effect of removing noise can be maximized through an optimal noise filter.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

10: Input terminal part
11: (+) terminal 12: (-) terminal
13: Ground terminal
20: Output terminal portion
21: (+) terminal 22: (-) terminal
23: Ground terminal
100: Noise filter
110: first noise filter 120: second noise filter
130: Third Noise Filter 140: Fourth Noise Filter
150: fifth noise filter 160: sixth noise filter
170: Seventh noise filter
200:
210: Filter selection switch 220: Power selection switch
230: Ground selection switch
300: Variable element part
310: first variable element 320: second variable element
330: third variable element 340: fourth variable element
350: fifth variable element 360: sixth variable element
400: Waveform output section
410: first display section 420: second display section
500: filter indicator
510: first filter display means 520: second filter display means
530: Third filter display means 540: Fourth filter display means
550: fifth filter display means 560: sixth filter display means
570: seventh filter display means

Claims (5)

Input and output terminal portions (10, 20) respectively connected to input and output terminals of a device generating noise;
A noise filter unit (100) provided with noise filters (110 to 170) having a predetermined circuit configuration to filter noise input through the input terminal unit (10);
A switch unit 200 including a filter selection switch 210 in which one of the noise filters 110 to 170 of the noise filter unit 100 is selected;
A variable element unit 300 including a plurality of tunable elements 310 to 360 for varying characteristics of elements constituting the noise filters 110 to 170 of the noise filter unit 100; And
A first display unit 410 for displaying the noise inputted through the input terminal unit 10 in a signal waveform and a second display unit 410 for filtering the noise filtered by the noise filter unit 100 outputted through the output terminal unit 20, A waveform output section (400) including a second display section (420) for displaying a waveform;
Wherein the variable filter comprises a variable element.
The method according to claim 1,
The selection device of the noise filter including the variable element
And filter display means 510 to 570 for indicating whether or not any one of the noise filters 110 to 170 of the noise filter unit 100 selected by the filter selection switch 210 of the switch unit 200 is selected A filter display unit 500;
Wherein the noise filter further comprises a variable element.
The method according to claim 1,
The input terminal portion 10
(+) Terminal 11, (-) terminal 12, and ground terminal 13,
The output terminal portion 20
(+) Terminal (21), (-) terminal (22), and ground terminal (23).
The method according to claim 1,
The switch unit 200
A power source selection switch 220 in which a DC power source or an AC power source is selected;
Wherein the noise filter further comprises a variable element.
The method according to claim 1,
The switch unit 200
A ground selection switch 230 in which a grounding mode or a grounding mode is selected depending on whether or not the device uses a grounding line;
Wherein the noise filter further comprises a variable element.

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