WO2012127875A1 - Variable inductor - Google Patents

Variable inductor Download PDF

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WO2012127875A1
WO2012127875A1 PCT/JP2012/002032 JP2012002032W WO2012127875A1 WO 2012127875 A1 WO2012127875 A1 WO 2012127875A1 JP 2012002032 W JP2012002032 W JP 2012002032W WO 2012127875 A1 WO2012127875 A1 WO 2012127875A1
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variable inductor
ceramic capacitor
coil
multilayer ceramic
capacitor
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PCT/JP2012/002032
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French (fr)
Japanese (ja)
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卓司 金丸
宮本　力
佐藤　隆史
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京セラ株式会社
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/40—Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
    • H01F21/08—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by varying the permeability of the core, e.g. by varying magnetic bias
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/30—Stacked capacitors

Definitions

  • the present invention relates to a variable inductor capable of arbitrarily adjusting inductance characteristics.
  • variable inductor In the conventional variable inductor, the inductance characteristic is arbitrarily varied by taking in and out the magnetic core inserted into the coil.
  • the conventional variable inductor is not suitable for miniaturization because the magnetic core is inserted into and removed from the coil by mechanical driving. Therefore, even now, basically, variable inductors are not used.
  • a variable inductor used as a matching circuit element that performs impedance matching between a transmitter of a radio and an antenna is known (for example, see Patent Document 1).
  • variable inductor by mechanical drive is basically not used. Therefore, a fixed inductor and a variable capacitor are used for frequency tuning in a radio. However, there is a limit to downsizing with the method of frequency tuning using a fixed inductor and a variable capacitor. There is a need for variable inductors that can be used.
  • the present invention has been made in view of such problems, and an object of the present invention is to provide a variable inductor capable of arbitrarily varying an inductance value without mechanical drive.
  • variable inductor according to the first aspect of the present invention is characterized by including a capacitor having a change in permittivity and permeability inside the coil.
  • variable inductor it is preferable that the dielectric constant and the magnetic permeability change by applying a voltage to the capacitor.
  • the capacitor is preferably a multilayer ceramic capacitor.
  • a dielectric corresponding to an F characteristic product is used for the multilayer ceramic capacitor.
  • variable inductor according to the second aspect of the present invention is characterized in that a coil is provided inside a capacitor whose permittivity and permeability change.
  • variable inductor according to the second aspect preferably includes a plurality of the coils, and each of the coils is connected in series.
  • variable inductor according to the second aspect preferably includes a plurality of the coils, and each of the coils is connected in parallel.
  • the dielectric constant and magnetic permeability inside the coil change, so that the inductance value can be arbitrarily changed without mechanical driving.
  • FIG. 1 is a diagram illustrating a change characteristic of capacitance of a multilayer ceramic capacitor.
  • the vertical axis represents the capacitance change rate (%), and the horizontal axis represents the DC voltage (V).
  • a high dielectric constant type multilayer ceramic capacitor that uses barium titanate (BaTiO 3 ) as a dielectric material, when a DC voltage (DC bias) is applied to the multilayer ceramic capacitor, The capacitance has a property of changing with the bias.
  • the capacitance is reduced by about 20% in the case of the B characteristic product, and the capacitance is reduced in the case of the F characteristic product. Reduce by 80%. It can be seen from FIG. 1 that the F characteristic product has a particularly large decrease in capacitance.
  • FIG. 2 is a diagram showing the configuration of the variable inductor according to the embodiment of the present invention.
  • the coil 11 includes a multilayer ceramic capacitor 12 inside the coil.
  • a direct voltage (DC bias) is applied to the electrode 13 of the multilayer ceramic capacitor 12.
  • DC bias direct voltage
  • the variable width is increased, it is preferable to use a dielectric corresponding to an F-characteristic product having a large capacitance variation for the multilayer ceramic capacitor 12.
  • the variable inductor shown in FIG. 1 As described above, by changing the DC voltage (DC bias) applied to the multilayer ceramic capacitor 12, the dielectric constant and magnetic permeability inside the coil change. Therefore, the variable inductor shown in FIG. The inductance value can be arbitrarily changed without any problem.
  • FIG. 3 is used to confirm that the inductance value of the coil provided with the multilayer ceramic capacitor actually changes when the DC voltage (DC bias) applied to the electrode of the multilayer ceramic capacitor is changed.
  • 1 is a diagram showing a Colpitts type oscillation circuit. In the circuit of FIG. 3, the oscillation frequency at VoutV was measured when the DC bias applied to the electrode of the multilayer ceramic capacitor was increased by 1V. Table 1 shows the measurement result of the oscillation frequency and the amount of change in the oscillation frequency.
  • FIG. 4 is a graph of Table 1, showing the amount of change in oscillation frequency based on the transmission frequency when the DC bias is 0V.
  • the horizontal axis indicates the applied voltage (V), and the vertical axis indicates the amount of change (ppm). It has been experimentally confirmed that as the DC bias is increased, the coil inductance value moves in the direction of increasing, and the oscillation frequency is lowered.
  • Table 2 shows the inductance value L of the coil calculated from the transmission frequency of the measurement result and the amount of change in the inductance value.
  • the inductance value changes although the change amount and the number of digits of the capacitance are different.
  • the amount of change in the inductance value is small.
  • the coil is wound around the capacitor. This is because it is affected only indirectly.
  • a coil may be formed by the internal electrode of the capacitor, and the coil may be built in the capacitor.
  • FIG. 5 is a diagram illustrating an example of a configuration of a variable inductor in which a coil is built in a capacitor.
  • the multilayer ceramic capacitor 22 includes a coil 21 inside the capacitor.
  • a direct voltage (DC bias) is applied to the electrode 23 of the multilayer ceramic capacitor 22.
  • FIG. 6 is a diagram showing another example of a configuration of a variable inductor in which a coil is built in a capacitor.
  • a plurality of coils 31 are formed in a multilayer pattern inside the multilayer ceramic capacitor 32.
  • a direct current voltage (DC bias) is applied to the electrode 33 of the multilayer ceramic capacitor 32.
  • a variable inductor having a large inductance value can be formed by connecting the coils 31 in series. Further, a variable inductor having a large current capacity can be formed by connecting the coils 31 in parallel.
  • a multilayer ceramic capacitor is used.
  • the present invention is not limited to a multilayer ceramic capacitor, and any capacitor can be used as long as the dielectric constant and permeability change depending on the applied voltage. May be.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

A coil (11) is provided with a laminated ceramic capacitor (12) on the inside of the coil. A direct current voltage (DC bias) is applied to an electrode (13) of the laminated ceramic capacitor (12). When the direct current voltage (DC bias) is applied to the laminated ceramic capacitor (12), permittivity ε and magnetic permeability µ change, and the electrostatic capacity changes. The inductance value of the coil (11) is changed by changing the magnetic permeability µ.

Description

可変インダクタVariable inductor 関連出願へのクロスリファレンスCross-reference to related applications
　本願は、日本国特許出願第２０１１－０６６１５８号（２０１１年３月２４日出願）の優先権の利益を主張し、これらの全内容を参照により本願明細書に取り込むものとする。 This application claims the benefit of the priority of Japanese Patent Application No. 2011-066158 (filed on Mar. 24, 2011), the entire contents of which are incorporated herein by reference.
　本発明は、インダクタンス特性を任意に調整できる可変インダクタに関する。 The present invention relates to a variable inductor capable of arbitrarily adjusting inductance characteristics.
　従来の可変インダクタは、コイルの中に挿入する磁性体コアを出し入れしてインダクタンス特性を任意に可変していた。従来の可変インダクタは、機械的駆動によりコイルの中に磁性体コアを出し入れするために、小型化には不向きである。したがって、現在でも、基本的に可変インダクタは利用されていない。
　なお、従来技術として、無線機の送信部とアンテナとの間のインピーダンス整合をとる整合回路素子として用いられる可変インダクタが知られている（例えば、特許文献１参照）。 In the conventional variable inductor, the inductance characteristic is arbitrarily varied by taking in and out the magnetic core inserted into the coil. The conventional variable inductor is not suitable for miniaturization because the magnetic core is inserted into and removed from the coil by mechanical driving. Therefore, even now, basically, variable inductors are not used.
As a conventional technique, a variable inductor used as a matching circuit element that performs impedance matching between a transmitter of a radio and an antenna is known (for example, see Patent Document 1).
特開平８－５５７３３号公報JP-A-8-55733
　上述したように、現在でも、基本的には機械的駆動による可変インダクタは利用されていない。そのため、無線機における周波数チューニングでは、固定インダクタと可変コンデンサが用いられているが、固定インダクタと可変コンデンサにより周波数チューニングを行う方法では、小型化には限界があるため、機械的駆動のない小型化が可能な可変インダクタが必要とされている。 As described above, even today, a variable inductor by mechanical drive is basically not used. Therefore, a fixed inductor and a variable capacitor are used for frequency tuning in a radio. However, there is a limit to downsizing with the method of frequency tuning using a fixed inductor and a variable capacitor. There is a need for variable inductors that can be used.
　本発明は、このような問題点に鑑みてなされたものであり、本発明の目的は、機械的駆動によることなくインダクタンス値を任意に可変できる可変インダクタを提供することにある。 The present invention has been made in view of such problems, and an object of the present invention is to provide a variable inductor capable of arbitrarily varying an inductance value without mechanical drive.
　上記目的を達成するため、本発明の第１の態様に係る可変インダクタは、コイル内部に、誘電率および透磁率が変化するコンデンサを備えることを特徴とする。 In order to achieve the above object, the variable inductor according to the first aspect of the present invention is characterized by including a capacitor having a change in permittivity and permeability inside the coil.
　第１の態様に係る可変インダクタにおいて、前記コンデンサに電圧を印加することにより前記誘電率および透磁率が変化することが好ましい。 In the variable inductor according to the first aspect, it is preferable that the dielectric constant and the magnetic permeability change by applying a voltage to the capacitor.
　第１の態様に係る可変インダクタにおいて、前記コンデンサは、積層セラミックコンデンサであることが好ましい。また、前記積層セラミックコンデンサには、Ｆ特性品に相当する誘電体が用いられることが好ましい。 In the variable inductor according to the first aspect, the capacitor is preferably a multilayer ceramic capacitor. In addition, it is preferable that a dielectric corresponding to an F characteristic product is used for the multilayer ceramic capacitor.
　また、本発明の第２の態様に係る可変インダクタは、誘電率および透磁率が変化するコンデンサの内部にコイルを備えることを特徴とする。 The variable inductor according to the second aspect of the present invention is characterized in that a coil is provided inside a capacitor whose permittivity and permeability change.
　第２の態様に係る可変インダクタにおいて、前記コイルを複数有し、前記コイルそれぞれは、直列接続されていることが好ましい。 The variable inductor according to the second aspect preferably includes a plurality of the coils, and each of the coils is connected in series.
　第２の態様に係る可変インダクタにおいて、前記コイルを複数有し、前記コイルそれぞれは、並列接続されていることが好ましい。 The variable inductor according to the second aspect preferably includes a plurality of the coils, and each of the coils is connected in parallel.
　本発明は、積層セラミックコンデンサに印加する電圧を可変することにより、コイル内部の誘電率、透磁率が変化するので、機械的駆動によることなくインダクタンス値を任意に変化させることができる。 In the present invention, by changing the voltage applied to the multilayer ceramic capacitor, the dielectric constant and magnetic permeability inside the coil change, so that the inductance value can be arbitrarily changed without mechanical driving.
積層セラミックコンデンサの静電容量の変化特性を示す図である。It is a figure which shows the change characteristic of the electrostatic capacitance of a multilayer ceramic capacitor. 本発明の実施の形態に係る可変インダクタの構成を示す図である。It is a figure which shows the structure of the variable inductor which concerns on embodiment of this invention. インダクタンス値が変化することを確認するために用いたコルピッツ型の発振回路を示す図である。It is a figure which shows the Colpitts type | mold oscillation circuit used in order to confirm that an inductance value changes. 発振周波数の変化量を示す図である。It is a figure which shows the variation | change_quantity of an oscillation frequency. コイルがコンデンサに内蔵された可変インダクタの構成の一例を示す図である。It is a figure which shows an example of a structure of the variable inductor by which the coil was incorporated in the capacitor | condenser. コイルがコンデンサに内蔵された可変インダクタの構成の他の例を示す図である。It is a figure which shows the other example of a structure of the variable inductor by which the coil was incorporated in the capacitor | condenser.
　本発明の可変インダクタの実施の形態について説明する前に、積層セラミックコンデンサの特性について説明する。図１は、積層セラミックコンデンサの静電容量の変化特性を示す図である。縦軸は静電容量変化率（％）を示しており、横軸は直流電圧（Ｖ）を示している。誘電体材料にチタン酸バリウム（ＢａＴｉＯ３）を使う高誘電率系の積層セラミックコンデンサは、図１に示すように、積層セラミックコンデンサに直流電圧（ＤＣバイアス）を印加すると、高容量コンデンサでは、静電容量がそのバイアスと共に変化する性質を有している。例えば、定格電圧が１０Ｖで静電容量が１０μＦの積層セラミックコンデンサに直流４Ｖを印加すると、Ｂ特性品の場合は静電容量が約２０％減少し、Ｆ特性品の場合は静電容量が約８０％減少する。図１からＦ特性品が特に静電容量の減少が大きいことが分かる。 Before describing the embodiment of the variable inductor of the present invention, the characteristics of the multilayer ceramic capacitor will be described. FIG. 1 is a diagram illustrating a change characteristic of capacitance of a multilayer ceramic capacitor. The vertical axis represents the capacitance change rate (%), and the horizontal axis represents the DC voltage (V). As shown in FIG. 1, a high dielectric constant type multilayer ceramic capacitor that uses barium titanate (BaTiO 3 ) as a dielectric material, when a DC voltage (DC bias) is applied to the multilayer ceramic capacitor, The capacitance has a property of changing with the bias. For example, if 4V DC is applied to a monolithic ceramic capacitor with a rated voltage of 10V and a capacitance of 10μF, the capacitance is reduced by about 20% in the case of the B characteristic product, and the capacitance is reduced in the case of the F characteristic product. Reduce by 80%. It can be seen from FIG. 1 that the F characteristic product has a particularly large decrease in capacitance.
　積層セラミックコンデンサの静電容量が印加電圧によって変化するのは、バイアス電圧の印加により見かけ上の誘電率εが変化するからである。
　静電容量Ｃは、
　Ｃ＝εＳ／Ｄ
　　ε：誘電率
　　Ｓ：電極面積
　　Ｄ：電極間距離
で表される。積層セラミックコンデンサに、直流電圧（ＤＣバイアス）を印加することにより、静電容量Ｃが変化するということは、電極面積Ｓおよび電極間距離Ｄは一定であるから、積層セラミックコンデンサ１２の見かけ上の誘電率εが変化しているということである。 The reason why the capacitance of the multilayer ceramic capacitor varies with the applied voltage is that the apparent dielectric constant ε varies with the application of the bias voltage.
Capacitance C is
C = εS / D
ε: Dielectric constant S: Electrode area D: Expressed by distance between electrodes. The capacitance C is changed by applying a DC voltage (DC bias) to the multilayer ceramic capacitor. Since the electrode area S and the inter-electrode distance D are constant, the multilayer ceramic capacitor 12 has an apparent appearance. That is, the dielectric constant ε changes.
　図２は、本発明の実施の形態に係る可変インダクタの構成を示す図である。コイル１１は、コイルの内部に、積層セラミックコンデンサ１２を備えている。積層セラミックコンデンサ１２の電極１３には、直流電圧（ＤＣバイアス）が印加される。可変幅を大きくする場合には、積層セラミックコンデンサ１２には、静電容量の変動の大きいＦ特性品に相当する誘電体を用いることが好ましい。 FIG. 2 is a diagram showing the configuration of the variable inductor according to the embodiment of the present invention. The coil 11 includes a multilayer ceramic capacitor 12 inside the coil. A direct voltage (DC bias) is applied to the electrode 13 of the multilayer ceramic capacitor 12. When the variable width is increased, it is preferable to use a dielectric corresponding to an F-characteristic product having a large capacitance variation for the multilayer ceramic capacitor 12.
　積層セラミックコンデンサ１２の電極１３に、直流電圧（ＤＣバイアス）が印加され、積層セラミックコンデンサ１２の見かけ上の誘電率εが変化すると、誘電率εと透磁率μとの間には、
　εμ＝１／ｖ２
　　ｖ：媒質中の光速
の関係があるので、それに伴い見かけ上の透磁率μも変化することになる。したがって、コイル１１の内部の積層セラミックコンデンサ１２の透磁率μが変化することになり、インダクタンスＬは、
　Ｌ＝μＳＮ２／ｄ
　　Ｓ：コイルの断面積
　　Ｎ：コイルの巻数
　　ｄ：コイルの長さ
で表されるので、透磁率μが変化することによりインダクタンスＬも変化することになる。 When a direct-current voltage (DC bias) is applied to the electrode 13 of the multilayer ceramic capacitor 12 and the apparent dielectric constant ε of the multilayer ceramic capacitor 12 changes, between the dielectric constant ε and the magnetic permeability μ,
εμ = 1 / v 2
v: Since there is a relationship with the speed of light in the medium, the apparent permeability μ also changes accordingly. Therefore, the magnetic permeability μ of the multilayer ceramic capacitor 12 inside the coil 11 changes, and the inductance L is
L = μSN 2 / d
S: Cross-sectional area of coil N: Number of turns of coil d: Expressed by length of coil, inductance L also changes as magnetic permeability μ changes.
　上述のように、積層セラミックコンデンサ１２に印加する直流電圧（ＤＣバイアス）を可変することにより、コイル内部の誘電率、透磁率が変化するので、図２で示した可変インダクタは、機械的駆動によることなくインダクタンス値を任意に変化させることができる。 As described above, by changing the DC voltage (DC bias) applied to the multilayer ceramic capacitor 12, the dielectric constant and magnetic permeability inside the coil change. Therefore, the variable inductor shown in FIG. The inductance value can be arbitrarily changed without any problem.
　図３は、積層セラミックコンデンサの電極に印加する直流電圧（ＤＣバイアス）を変化させたときに、積層セラミックコンデンサを内部に備えたコイルのインダクタンス値が、実際に変化することを確認するために用いたコルピッツ型の発振回路を示す図である。図３の回路にて、積層セラミックコンデンサの電極に印加するＤＣバイアスを１Ｖずつ増加させたときの、Ｖout における発振周波数を測定した。表１は、発振周波数の測定結果と発振周波数の変化量を示している。 FIG. 3 is used to confirm that the inductance value of the coil provided with the multilayer ceramic capacitor actually changes when the DC voltage (DC bias) applied to the electrode of the multilayer ceramic capacitor is changed. 1 is a diagram showing a Colpitts type oscillation circuit. In the circuit of FIG. 3, the oscillation frequency at VoutＶ was measured when the DC bias applied to the electrode of the multilayer ceramic capacitor was increased by 1V. Table 1 shows the measurement result of the oscillation frequency and the amount of change in the oscillation frequency.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　図４は、表１をグラフ化させたもので、ＤＣバイアスが０Ｖのときの発信周波数を基準にした発振周波数の変化量を示す図である。横軸が印加電圧（Ｖ）を示し、縦軸が変化量（ｐｐｍ）を示す。ＤＣバイアスを大きくしていくと、コイルのインダクタンス値が大きくなる方向に動き、発振周波数が下がっていることが実験的に確かめられた。 FIG. 4 is a graph of Table 1, showing the amount of change in oscillation frequency based on the transmission frequency when the DC bias is 0V. The horizontal axis indicates the applied voltage (V), and the vertical axis indicates the amount of change (ppm). It has been experimentally confirmed that as the DC bias is increased, the coil inductance value moves in the direction of increasing, and the oscillation frequency is lowered.
　表２は、測定結果の発信周波数から算出したコイルのインダクタンス値Ｌとインダクタンス値の変化量を示している。
Figure JPOXMLDOC01-appb-T000002
 Table 2 shows the inductance value L of the coil calculated from the transmission frequency of the measurement result and the amount of change in the inductance value.
Figure JPOXMLDOC01-appb-T000002
　図１に示す積層セラミックコンデンサの静電容量の変化特性と比較すると、静電容量の変化量と桁数が違うが、インダクタンス値が、変化していることが分かる。インダクタンス値の変化量が小さいのは、積層セラミックコンデンサは、印加電圧による電極間誘電率の変化により、容量値が変化しても、コイルは、コンデンサの周囲に巻き回しているため、誘電率変化の影響を間接的にしか受けないためである。 Compared with the change characteristics of the capacitance of the multilayer ceramic capacitor shown in FIG. 1, it can be seen that the inductance value changes although the change amount and the number of digits of the capacitance are different. The amount of change in the inductance value is small. In the multilayer ceramic capacitor, even if the capacitance value changes due to the change in the dielectric constant between electrodes due to the applied voltage, the coil is wound around the capacitor. This is because it is affected only indirectly.
　また、ＤＣバイアスを変化させたときに発振周波数の特性のみが変化し、他の特性に影響を与えていないことも確認できた。これにより、積層セラミックコンデンサへ印加するＤＣバイアスを可変とすることにより、コイルのインダクタンス値のみを可変できることが確認できた。 It was also confirmed that when the DC bias was changed, only the characteristics of the oscillation frequency changed and no other characteristics were affected. Thus, it was confirmed that only the inductance value of the coil can be varied by making the DC bias applied to the multilayer ceramic capacitor variable.
　また、本発明は、コンデンサの内部電極でコイルを形成して、コイルをコンデンサに内蔵するようにしてもよい。図５は、コイルがコンデンサに内蔵された可変インダクタの構成の一例を示す図である。積層セラミックコンデンサ２２は、コンデンサの内部に、コイル２１を備えている。積層セラミックコンデンサ２２の電極２３には、直流電圧（ＤＣバイアス）が印加される。 Further, in the present invention, a coil may be formed by the internal electrode of the capacitor, and the coil may be built in the capacitor. FIG. 5 is a diagram illustrating an example of a configuration of a variable inductor in which a coil is built in a capacitor. The multilayer ceramic capacitor 22 includes a coil 21 inside the capacitor. A direct voltage (DC bias) is applied to the electrode 23 of the multilayer ceramic capacitor 22.
　図６は、コイルがコンデンサに内蔵された可変インダクタの構成の他の例を示す図である。積層セラミックコンデンサ３２の内部に、多層パターンで複数個のコイル３１が形成されている。積層セラミックコンデンサ３２の電極３３には、直流電圧（ＤＣバイアス）が印加される。コイル３１を直列接続することで、大きなインダクタンス値の可変インダクタを形成することができる。また、コイル３１を並列接続することで、電流容量の大きな可変インダクタを形成することができる。 FIG. 6 is a diagram showing another example of a configuration of a variable inductor in which a coil is built in a capacitor. A plurality of coils 31 are formed in a multilayer pattern inside the multilayer ceramic capacitor 32. A direct current voltage (DC bias) is applied to the electrode 33 of the multilayer ceramic capacitor 32. A variable inductor having a large inductance value can be formed by connecting the coils 31 in series. Further, a variable inductor having a large current capacity can be formed by connecting the coils 31 in parallel.
　なお、上述した実施形態では、積層セラミックコンデンサを用いているが、本発明は、積層セラミックコンデンサに限らず、印加電圧によって誘電率、透磁率が変化するものであれば、どのようなコンデンサを用いてもよい。 In the above-described embodiment, a multilayer ceramic capacitor is used. However, the present invention is not limited to a multilayer ceramic capacitor, and any capacitor can be used as long as the dielectric constant and permeability change depending on the applied voltage. May be.
　１１、２１、３１　コイル
　１２、２２、３２　積層セラミックコンデンサ
　１３、３２、３３　電極 11, 21, 31 Coil 12, 22, 32 Multilayer ceramic capacitor 13, 32, 33 Electrode

Claims (7)

  1. 　コイル内部に、誘電率および透磁率が変化するコンデンサを備えることを特徴とする可変インダクタ。 A variable inductor characterized in that a capacitor having a change in permittivity and permeability is provided inside the coil.
  2. 　前記コンデンサに電圧を印加することにより前記誘電率および透磁率が変化することを特徴とする請求項１に記載の可変インダクタ。 The variable inductor according to claim 1, wherein the dielectric constant and the magnetic permeability change by applying a voltage to the capacitor.
  3. 　前記コンデンサは、積層セラミックコンデンサであることを特徴とする請求項１に記載の可変インダクタ。 2. The variable inductor according to claim 1, wherein the capacitor is a multilayer ceramic capacitor.
  4. 　前記積層セラミックコンデンサには、Ｆ特性品に相当する誘電体が用いられていることを特徴とする請求項３に記載の可変インダクタ。 4. The variable inductor according to claim 3, wherein the multilayer ceramic capacitor uses a dielectric corresponding to an F characteristic product.
  5. 　誘電率および透磁率が変化するコンデンサの内部にコイルを備えることを特徴とする可変インダクタ。 A variable inductor comprising a coil inside a capacitor whose dielectric constant and permeability change.
  6. 　前記コイルを複数有し、
    　前記コイルそれぞれは、直列接続されていることを特徴とする請求項５に記載の可変インダクタ。     A plurality of the coils;
    The variable inductor according to claim 5, wherein each of the coils is connected in series.
  7. 　前記コイルを複数有し、
    　前記コイルそれぞれは、並列接続されていることを特徴とする請求項５に記載の可変インダクタ。     A plurality of the coils;
    The variable inductor according to claim 5, wherein each of the coils is connected in parallel.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014061672A1 (en) * 2012-10-18 2014-04-24 株式会社村田製作所 Coil component
CN109786080A (en) * 2019-03-11 2019-05-21 中国计量大学 A kind of light-operated integrated on-chip inductor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102325001B1 (en) * 2020-10-05 2021-11-10 김하정 Magnetic core with permeability control device and magnetic device with the same

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JPS61150204A (en) * 1984-12-24 1986-07-08 Nec Corp Current control type variable inductor
JPS62154706A (en) * 1985-12-27 1987-07-09 Hitachi Ltd Inductor
JPH0260220U (en) * 1988-10-25 1990-05-02

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61150204A (en) * 1984-12-24 1986-07-08 Nec Corp Current control type variable inductor
JPS62154706A (en) * 1985-12-27 1987-07-09 Hitachi Ltd Inductor
JPH0260220U (en) * 1988-10-25 1990-05-02

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014061672A1 (en) * 2012-10-18 2014-04-24 株式会社村田製作所 Coil component
CN109786080A (en) * 2019-03-11 2019-05-21 中国计量大学 A kind of light-operated integrated on-chip inductor

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