KR20180026090A - Adjustable Capacitor. - Google Patents

Abstract

The present invention relates to a variable capacitor for selectively connecting an electrode in parallel to vary capacitance of a capacitor. According to the present invention, the variable capacitor comprises: a first electrode of a plate shape made of one conductor; an insulator of a plate shape located on one surface of the first electrode; and a second electrode of a plate shape to which each unit electrode is connected in parallel through each switch wherein several conductors are separately arranged on one surface of the insulator to form unit electrodes. By sequentially turning the switches on, unit electrodes of the second electrode are sequentially connected to vary capacitance of a capacitor. According to the present invention, capacitance of the capacitor is easily adjusted by using the variable capacitor to adjust a desired time constant and a desired resonant frequency and improve a power factor value.

Description

{Adjustable Capacitor}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a variable capacitor capable of adjusting a capacitance, and more particularly, to a variable capacitor that selectively varies the capacitance of a capacitor by connecting electrodes in parallel.

In the electronic circuit, there are a typical passive element such as a resistor (R), a capacitor (C), and an inductor (L). Dual capacitors have many functions such as time constant circuit and noise elimination role, coupling capacitor, and integrator circuit application in the circuit by applying basic characteristics of charge accumulation and discharge. It is the most diverse, complex, and most commonly used electronic component.

Generally, most capacitors are fixed capacity capacitors that are manufactured with fixed capacitance values. They are used for adjusting the time constant in the time constant circuit and oscillation circuit, adjusting the resonance frequency in the resonance circuit, improving the power factor of the load, Several capacitors can be combined in series or in parallel to obtain the capacitance value of the desired capacitor. However, it is impossible to adjust the capacitance of the capacitor from time to time, and a complicated configuration is required to obtain the capacitance value of the desired capacitor, so that the volume becomes large and it is difficult to make the capacitance value of the desired capacitor.

Korean Patent Publication No. 10-2016-0074240 (variable capacitor module and control method thereof)

An object of the present invention is to provide an apparatus for varying the capacitance of a capacitor by changing an area of a capacitor electrode plate through a switch.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

According to a first aspect of the present invention, there is provided a variable capacitor comprising: a plate-shaped first electrode composed of one conductor; a plate-shaped insulator disposed on one surface of the first electrode; A plurality of unit conductors arranged in a spaced relation to each other to form unit electrodes, and each of the unit electrodes includes a plate-shaped second electrode connected in parallel through respective switches, and the switches are sequentially turned on, The capacitance of the capacitor can be varied by adjusting the electrode plate area of the capacitor by sequentially connecting the unit electrodes of the two electrodes.

The unit electrodes of the second electrode may have the same area, the first electrode may be a cathode, and the second electrode may be a cathode.

The first electrode, the insulator, and the second electrode having the laminated structure may be formed in a roll shape.

The variable capacitor according to the second embodiment of the present invention includes a first electrode in the form of a single cylinder, an insulator surrounding the outer side of the first electrode, and a plurality of conductors spaced apart from each other, Wherein each unit electrode includes a second electrode connected in parallel through each switch and sequentially turns on the switch so that the unit electrodes of the second electrode sequentially connect to each other, The capacitance of the capacitor can be varied by adjusting the electrode plate area.

The unit electrodes of the second electrode may have the same area, the first electrode may be a cathode, and the second electrode may be a cathode.

The second electrodes may be spaced apart from each other along the outer circumferential surface of the insulator so as to correspond to the curvature of the insulator.

The second electrode may have an annular shape and may be spaced apart from the insulator in a vertical direction.

In addition, other features and advantages of the present invention may be newly understood through embodiments of the present invention.

In the case of varying the capacitance of the capacitor according to the present invention, it is possible to adjust the desired time constant, adjust the resonance frequency, and improve the power factor value by easily adjusting the capacitance of the capacitor.

Further, by varying the capacitance of the capacitor by using one capacitor, the structure of the circuit is simplified, and the entire circuit can be downsized.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

1 is a perspective view showing a general laminated capacitor.
2 is a perspective view illustrating a capacitor structure in which a second electrode according to the first embodiment of the present invention is laminated in a plate form.
3 is a perspective view showing a variable capacitor formed in a roll shape according to the first embodiment of the present invention.
4 is a perspective view showing a variable capacitor having a plurality of spaced apart electrodes arranged along an outer circumferential surface of an insulator such that a second electrode according to a second embodiment of the present invention corresponds to a curvature of the insulator.
5 is a perspective view showing a variable capacitor in which a plurality of second electrodes according to a second embodiment of the present invention are annularly arranged in a vertical direction on the outer side of an insulator.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

If any part is referred to as being "on" another part, it may be directly on the other part or may be accompanied by another part therebetween. In contrast, when a section is referred to as being "directly above" another section, no other section is involved.

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Terms indicating relative space such as "below "," above ", and the like may be used to more easily describe the relationship to other portions of a portion shown in the figures. These terms are intended to include other meanings or acts of the apparatus in use, as well as intended meanings in the drawings. For example, when inverting a device in the figures, certain parts that are described as being "below" other parts are described as being "above " other parts. Thus, an exemplary term "below" includes both up and down directions. The device can be rotated 90 degrees or rotated at different angles, and the term indicating the relative space is interpreted accordingly.

Unless otherwise defined, all terms including technical 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. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 is a perspective view showing a general flat plate capacitor.

1, a conventional flat plate capacitor 100 includes a first electrode 110 and a second electrode 130, which are conductors, and an insulator 120 that insulates the electrodes from each other. The first electrode 110 and the second electrode 130 are electrically connected to each other. ≪ / RTI > The capacitance of such a capacitor is determined by the area of the electrode, the distance between the electrodes, and the dielectric constant of the insulator, and can be calculated by the following equation (1).

C is the capacitance of the capacitor; ε is the dielectric constant of the insulator; d is the gap between the electrodes; A is the area of the electrode.

The capacitance of the capacitor can be varied by adjusting the area of the electrode.

2 is a perspective view illustrating a capacitor structure in which a second electrode according to the first embodiment of the present invention is laminated in a plate form.

2, the variable capacitor 200 according to the first embodiment includes a first electrode 210, an insulator 220, a second electrode 230, a switch 231, and a switch control unit (not shown) . That is, the variable capacitor 200 of the first embodiment has the switch 231 of the second electrode 230 in the form of a plate in which the first electrode 210, the insulator 220 and the second electrode 230 are stacked. The capacitance of the capacitor can be varied by adjusting the area of the second electrode 230 by controlling the capacitance of the capacitor.

The first electrode 210 is arranged to be in balance with the second electrode 230, and is configured in the form of a plate as one conductor.

The insulator 220 is disposed on one surface of the first electrode 210 and is formed in a plate shape. The insulator 220 may be composed of paper, mica, glass, ceramics, electrolyte, or the like. The variable capacitor 200 may have a polarity depending on the type of the insulator 220 and the presence or absence of polarity. When the variable capacitor 200 has a polarity, the first electrode 210 is a cathode and the second electrode 230 is an anode. The polarity is discriminated and voltage is applied to both electrodes.

The second electrode 230 is located on one side of the insulator 220. The second electrode 230 has a plurality of conductors spaced from each other to form a unit electrode, and each unit electrode is formed in a plate shape connected in parallel through each switch 231. Each of the unit electrodes may have the same area.

The plurality of switches 231 connect the unit electrodes of the second electrode 230 in parallel. The switch 231 is controlled by a switch control unit. When the plurality of switches 231 are sequentially turned on, the unit electrodes of the second electrode 230 are sequentially connected. When a voltage is applied to the variable capacitor 200, the switch 231 is turned on and current flows between the unit electrodes of the second electrode 230 connected thereto. The electrostatic capacitance per unit electrode of the variable capacitor 200 can be calculated according to the following equation (2).

In Equation (2), C1 denotes a capacitance per unit electrode of the variable capacitor 200. Also,? Refers to the dielectric constant of the insulator 220. D is the distance between the first electrode 210 and the second electrode 230, and A 1 is the unit electrode area of the second electrode 230.

The switch control unit controls on / off of each of the switches 231 connected to each unit electrode so that the unit electrode functions as an electrode of the capacitor according to the capacitance of the set capacitor. Such a switch control section may be implemented by analog control or digital control.

The capacitance of the variable capacitor 200 can be varied by the sum of the capacitances per unit electrode conducted according to the control of the switch 231 of the switch control unit. For example, if the electrostatic capacitance of the second electrode 230 is 10 nF (nano farad) and the capacitance of the second electrode 230 is 10 nanometers (10 nanometers), the capacitance of the variable capacitor 200 is 50 nF , The switch control unit turns on the switches S1 to S4 connected in parallel from the first mono-wing electrode to the fifth mono-wing electrode connected to the lead to make the five unit electrodes of the second electrode 230 conductive On.

3 is a perspective view showing a variable capacitor formed in a roll shape according to the first embodiment of the present invention.

3, the variable capacitor 300 includes a first electrode 310, an insulator 320, and a second electrode 330. The variable capacitor 300 includes a first electrode 310, an insulator 320, Two electrodes 330 are stacked. The variable capacitor 300 configured in the form of a roll can be reduced in volume to downsize the capacitor.

4 is a perspective view showing a variable capacitor having a plurality of spaced apart electrodes arranged along an outer circumferential surface of an insulator such that a second electrode according to a second embodiment of the present invention corresponds to a curvature of the insulator.

4, the variable capacitor 400 according to the second embodiment includes a first electrode 410, an insulator 420, a second electrode 430, a switch 431, and a switch control unit (not shown) . That is, the variable capacitor 400 includes a first electrode 410 in a cylindrical shape, an insulator 420 surrounding the first electrode 410, a second electrode 430 located outside the insulator, and a second electrode 430 formed of a unit electrode. The capacitance of the capacitor can be varied by controlling the switch 431 to adjust the area of the second electrode 430. [

The first electrode 410 is surrounded by the second electrode 430 and has a cylindrical shape, which is one conductor.

The insulator 420 surrounds the outside of the first electrode 410 and may be composed of paper, mica, glass, ceramics, electrolyte, or the like. The variable capacitor 400 may have a polarity depending on the type and polarity of the insulator 420. When the variable capacitor 400 has a polarity, the first electrode 410 is a cathode and the second electrode 430 is an anode.

The second electrode 430 is located on the outer side of the insulator 420, and several conductors are spaced apart to form unit electrodes, and the unit electrodes are connected in parallel through the respective switches 431. Each of the unit electrodes may have the same area. The second electrodes 430 are disposed apart from each other along the outer circumferential surface of the insulator so as to correspond to the curvature of the insulator.

The switch 431 connects the unit electrodes of the second electrode 430 in parallel. The switch 431 is controlled by a switch control unit, and the control method by the switch control unit is the same as or similar to the control method described with respect to the variable capacitor 200. When the switch 431 is sequentially turned on, the unit electrodes of the second electrode 430 are sequentially connected. When a voltage is applied to the variable capacitor 400, the switch 431 is turned on so that current flows between the unit electrodes of the second electrode 430 connected thereto. The capacitance per unit electrode of the variable capacitor 400 can be calculated according to the following equation (3).

In Equation (3), C1 is the capacitance per unit electrode of the variable capacitor 400; ? is the dielectric constant of the insulator 420; l is a cylinder height of the first electrode 410; r1 is the radius of the first electrode 410; r2 is the radius of curvature of the second electrode 420; and a represents the curved surface length of the unit electrode.

The capacitance of the variable capacitor 400 can be varied by the sum of the capacitances per unit electrode conducted according to the control of the switch 431. [

5 is a perspective view showing a variable capacitor in which a plurality of second electrodes according to a second embodiment of the present invention are annularly arranged in a vertical direction on the outer side of an insulator.

5, the variable capacitor 500 includes a first electrode 510, an insulator 520, a second electrode 530, a switch 531, and a switch control unit (not shown).

The first electrode 510 is surrounded by the second electrode 530 and is formed in a cylindrical shape as one conductor.

The insulator 520 surrounds the outside of the first electrode 510 and may be composed of paper, mica, glass, ceramics, electrolyte, or the like.

The second electrode 530 is located outside the insulator 520 and several conductors are spaced apart to form a unit electrode, and each unit electrode is connected in parallel through each switch 531. The switch 531 is controlled by the switch control unit, and the control method by the switch control unit is the same as or similar to the control method described with respect to the variable capacitor 200. Each of the unit electrodes may have the same area. The two electrodes 530 are annularly arranged so as to be spaced from each other in a direction perpendicular to the outer axis of the insulator, and the unit electrodes are electrically connected by switch control. The capacitance per unit electrode of the variable capacitor 500 can be calculated according to the following equation (4).

In Equation (3), C1 is the capacitance per unit electrode of the variable capacitor 500; epsilon is the dielectric constant of the insulator 520; l1 is an annular height of the second electrode 510; r1 is the radius of the first electrode 510; and r2 is the radius of the second electrode 520. [

The capacitance of the variable capacitor 500 can be varied by the sum of the capacitance per unit electrode conducted according to the switch control.

In the case of varying the capacitance of the capacitor according to the present invention, it is possible to adjust the desired time constant, adjust the resonance frequency, and improve the power factor value by easily adjusting the capacitance of the capacitor. Further, by varying the capacitance of the capacitor by using one capacitor, the structure of the circuit is simplified, and the entire circuit can be downsized.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. 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.

110: first electrode 120: insulator
130: second electrode 210: first electrode
220: insulator 230: second electrode
231: switch 310: first electrode
320: Insulator 330: Second electrode
410: first electrode 420: insulator
430: second electrode 431: switch
510: first electrode 520: insulator
530: second electrode 531: switch

Claims (9)

A first electrode in the form of a plate composed of one conductor;
A plate-shaped insulator located on one surface of the first electrode; And
And a second electrode in the form of a plate having a plurality of conductors spaced from each other on one surface of the insulator to form a unit electrode and each of the unit electrodes being connected in parallel through respective switches,
And the unit electrodes of the second electrode are sequentially connected by turning on the switches sequentially.
The method according to claim 1,
And the unit electrodes of the second electrode have the same area.
The method according to claim 1,
Wherein the first electrode is a cathode and the second electrode is an anode.
The method according to claim 1,
Wherein the first electrode, the insulator, and the second electrode are laminated in a rolled form.
A first electrode of a cylindrical shape having one conductor;
An insulator surrounding the outside of the first electrode;
And a second electrode disposed on the outer side of the insulator to form a plurality of conductors spaced apart from each other to form a unit electrode and each of the unit electrodes being connected in parallel through respective switches,
And the unit electrodes of the second electrode are sequentially connected by turning on the switches sequentially.
6. The method of claim 5,
And the unit electrodes of the second electrode have the same area.
6. The method of claim 5,
Wherein the first electrode is a cathode and the second electrode is an anode.
6. The method of claim 5,
And the second electrodes are spaced apart from each other along the outer circumferential surface of the insulator so as to correspond to the curvature of the insulator.
6. The method of claim 5,
Wherein the second electrode is formed in an annular shape and is arranged at a plurality of positions spaced apart from each other in a vertical direction on the outer side of the insulator.

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