JP2009010207A - Common mode choke coil - Google Patents

Common mode choke coil Download PDF

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JP2009010207A
JP2009010207A JP2007170790A JP2007170790A JP2009010207A JP 2009010207 A JP2009010207 A JP 2009010207A JP 2007170790 A JP2007170790 A JP 2007170790A JP 2007170790 A JP2007170790 A JP 2007170790A JP 2009010207 A JP2009010207 A JP 2009010207A
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common mode
choke coil
mode choke
core
magnetic
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JP4835946B2 (en
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Kanji Tanaka
寛司 田中
Zenei Nishikawa
善栄 西川
Masaya Hirai
真哉 平井
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/045—Fixed inductances of the signal type  with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F2017/0093—Common mode choke coil

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a common mode choke coil improved in immunity characteristics by forming its coil structure in to the one which can prevent malfunctions of a transmitting IC and a receiving IC at the time of an immunity test. <P>SOLUTION: The common mode choke coil is provided with a core 2, outside electrodes 3-1 to 3-4, a pair of coils 4-1 and 4-2, and a top plate 5. The core 2 is composed of a winding core part 20 and flanges 21, 22. Also, the pair of coils 4-1 and 4-2 are wound around the winding core part 20 of the core 2, and ends of the coils 4-1 and 4-2 are connected to the outside electrodes 3-1 to 3-4, respectively. Furthermore, a resistance part 6 is interposed between a top plate 5 and the flanges 21, 22. This resistance part 6 is constituted by alternately laminating three layers of metal films 61-63 and two layers of magnetic plate pieces 51 and 52, and bonded to upper end surfaces of the flanges 21 and 22 with an adhesive 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、伝送線路上のコモンモードノイズを除去するための巻線型のコモンモードチョークコイルに関するものである。   The present invention relates to a winding type common mode choke coil for removing common mode noise on a transmission line.

従来、この種のコモンモードチョークコイルとしては、例えば特許文献１や特許文献２に開示の技術がある。
このコモンモードチョークコイルは、２本の巻線を、両端に鍔部を有したコアの巻芯部に巻回し、巻線の両端を鍔部の電極に接続すると共に、フェライト板を、鍔部の上面側に渡した構成をなす。
かかる構成により、差動伝送路等に侵入したコモンモードノイズを除去することができるようになっている。 Conventionally, as this type of common mode choke coil, for example, there are technologies disclosed in Patent Document 1 and Patent Document 2.
In this common mode choke coil, two windings are wound around a core part of a core having flanges at both ends, both ends of the winding are connected to the electrodes of the flanges, and the ferrite plate is The configuration passed to the top side of the.
With this configuration, it is possible to remove common mode noise that has entered the differential transmission path and the like.

特開２００３−１６８６１１号公報JP 2003-168611 A 特開２０００−１３３５２２号公報JP 2000-133522 A

しかし、上述した従来のコモンモードチョークコイルでは次のような問題がある。
通常、製品を市販する前に、製品を想定し得る電磁妨害等に曝し、各種電磁妨害に耐えうるかどうかのイミュニティ試験が行われる。
コモンモードチョークコイルのコモンモードノイズに対するイミュニティ試験では、被試験品であるコモンモードチョークコイルを、差動伝送路を通じて送信ＩＣ（Integrated Circuit）に接続された受信ＩＣの前段に配する。そして、差動信号を差動伝送路を通じて送信ＩＣから受信ＩＣに送信すると共に、低周波のコモンモードノイズを差動伝送路上に発生させて、このコモンモードノイズを差動信号に載せる。かかる状態で、送信ＩＣや受信ＩＣが誤動作を起こすかどうかを確認する。
しかしながら、かかるイミュニティ試験時において、被試験品のコモンモードチョークコイルのインダクタンスと受信ＩＣの入力容量とが共振回路を構成するため、この共振回路の共振周波数及びその近傍の周波数帯域においてコモンモードノイズを抑制する割合が低下する。かかる場合には、送信ＩＣや受信ＩＣが誤動作し、被試験品がイミュニティ試験をパスしないという問題が生じる。 However, the above-described conventional common mode choke coil has the following problems.
Usually, before a product is put on the market, the product is exposed to an electromagnetic interference that can be assumed, and an immunity test is performed to determine whether the product can withstand various electromagnetic interferences.
In an immunity test for common mode noise of a common mode choke coil, a common mode choke coil, which is a device under test, is disposed in front of a reception IC connected to a transmission IC (Integrated Circuit) through a differential transmission path. Then, the differential signal is transmitted from the transmission IC to the reception IC through the differential transmission path, and low-frequency common mode noise is generated on the differential transmission path, and this common mode noise is placed on the differential signal. In this state, it is confirmed whether or not the transmission IC or the reception IC malfunctions.
However, during such immunity test, the inductance of the common mode choke coil of the device under test and the input capacitance of the receiving IC constitute a resonance circuit, so that common mode noise is generated at the resonance frequency of this resonance circuit and the frequency band in the vicinity thereof. The rate of suppression decreases. In such a case, there is a problem that the transmission IC and the reception IC malfunction and the product under test does not pass the immunity test.

この発明は、上述した課題を解決するためになされたもので、コイルの構造をイミュニティ試験時における送信ＩＣや受信ＩＣの誤動作を防止可能な構造にして、イミュニティ特性の改善を図ったコモンモードチョークコイルを提供することを目的とする。   The present invention has been made to solve the above-described problems. The common mode choke is designed to improve the immunity characteristics by making the coil structure prevent the malfunction of the transmitting IC and the receiving IC during the immunity test. An object is to provide a coil.

上記課題を解決するために、請求項１の発明は、巻芯部及びこの巻芯部の両端部にそれぞれ設けられた第１及び第２の鍔部を有して成る磁性コアと、 第１及び第２の鍔部にそれぞれ形成された外部電極と、巻芯部に巻装され且つ各端部が外部電極まで引き出されて接合された１対の巻線と、 第１及び第２の鍔部の上に接合される磁性板とを備えたコモンモードチョークコイルであって、複数の金属膜と磁性板片とを、第１及び第２の鍔部の上端面と磁性板との間に交互に積層して抵抗部を形成し、この抵抗部を接着剤を介して第１及び第２の鍔部の上端面と磁性板との間に接合した構成とする。
かかる構成により、複数の金属膜と磁性板片とが積層された抵抗部が、第１及び第２の鍔部の上端面と磁性板との間に介在しているので、１対の巻線内の電流による磁力線が、この抵抗部を通り、各金属膜に渦電流が発生する。したがって、イミュニティ試験時におけるコモンモードチョークコイルのインダクタンスと受信ＩＣの入力部のキャパシタンスとで構成される共振回路の共振周波数及びその近傍の周波数帯域内のノイズに対する抵抗成分が、この抵抗部によって増加し、コモンモードノイズが抑圧される。この結果、イミュニティ試験における全ての周波数帯域のノイズに対して、良好なノイズ抑圧効果を発揮する。 In order to solve the above-mentioned problems, the invention of claim 1 includes a magnetic core having a winding core portion and first and second flange portions respectively provided at both ends of the winding core portion. And an external electrode formed on each of the second flanges, a pair of windings wound around the core and drawn out to the external electrodes and joined to each other, and the first and second flanges A common mode choke coil having a magnetic plate bonded on a portion, wherein a plurality of metal films and a magnetic plate piece are disposed between the upper end surface of the first and second flange portions and the magnetic plate. A resistance part is formed by alternately stacking, and the resistance part is joined between the upper end surfaces of the first and second flange parts and the magnetic plate via an adhesive.
With this configuration, the resistance portion in which a plurality of metal films and magnetic plate pieces are laminated is interposed between the upper end surfaces of the first and second flange portions and the magnetic plate, so that a pair of windings Magnetic field lines due to the current inside pass through this resistance portion, and an eddy current is generated in each metal film. Therefore, the resistance component increases the resistance component against the resonance frequency of the resonance circuit composed of the inductance of the common mode choke coil and the capacitance of the input part of the receiving IC during the immunity test and noise in the frequency band in the vicinity thereof. Common mode noise is suppressed. As a result, it exhibits a good noise suppression effect against noise in all frequency bands in the immunity test.

請求項２の発明は、請求項１に記載のコモンモードチョークコイルにおいて、金属膜を、鉄，コバルト，ニッケル，クロム，マンガン及び銅の内の少なくともいずれかを含む強磁性体で形成した構成とする。
かかる構成により、良好な磁気特性を保持しつつ、ノイズに対する抵抗成分をさらに増加させることができる。 The invention of claim 2 is the common mode choke coil according to claim 1, wherein the metal film is formed of a ferromagnetic material including at least one of iron, cobalt, nickel, chromium, manganese and copper; To do.
With this configuration, it is possible to further increase the resistance component against noise while maintaining good magnetic characteristics.

請求項３の発明は、請求項２に記載のコモンモードチョークコイルにおいて、金属膜を、ニクロムを主成分とする強磁性体の合金で形成した構成とする。   According to a third aspect of the present invention, in the common mode choke coil according to the second aspect, the metal film is formed of a ferromagnetic alloy containing nichrome as a main component.

請求項４の発明は、請求項１ないし請求項３のいずれかに記載のコモンモードチョークコイルにおいて、磁性コアと磁性板と磁性板片を、それぞれフェライトで形成した構成とする。
かかる構成により、コモンモードチョークコイルの磁気特性を向上させることができる。 According to a fourth aspect of the present invention, in the common mode choke coil according to any one of the first to third aspects, the magnetic core, the magnetic plate, and the magnetic plate piece are each formed of ferrite.
With this configuration, the magnetic characteristics of the common mode choke coil can be improved.

請求項５の発明は、請求項１ないし請求項４のいずれかに記載のコモンモードチョークコイルにおいて、接着剤に、磁粉を混入した構成とする。
かかる構成により、コモンモードチョークコイルの磁気特性をさらに向上させることができる。 According to a fifth aspect of the present invention, in the common mode choke coil according to any one of the first to fourth aspects, magnetic powder is mixed in the adhesive.
With this configuration, the magnetic characteristics of the common mode choke coil can be further improved.

以上詳しく説明したように、この発明のコモンモードチョークコイルによれば、抵抗部を第１及び第２の鍔部と磁性板との間に接合して、抵抗成分を増加させる構成としたので、イミュニティ特性の改善が図られ、この結果、イミュニティ試験における全ての周波数帯域のノイズに対する良好なノイズ抑圧効果を実現することができるという効果がある。
また、請求項２及び請求項３の発明によれば、ノイズに対する抵抗成分をさらに増加させることができるので、ノイズ抑圧効果をさらに高めることができる。
また、請求項４及び請求項５の発明によれば、コモンモードチョークコイルの磁気特性をさらに向上させることができる。 As described above in detail, according to the common mode choke coil of the present invention, the resistance portion is joined between the first and second flange portions and the magnetic plate, so that the resistance component is increased. Immunity characteristics are improved, and as a result, there is an effect that a good noise suppression effect for noise in all frequency bands in the immunity test can be realized.
Moreover, according to the invention of Claim 2 and Claim 3, since the resistance component with respect to noise can be further increased, the noise suppression effect can be further enhanced.
Moreover, according to the invention of Claim 4 and Claim 5, the magnetic characteristic of a common mode choke coil can further be improved.

以下、この発明の最良の形態について図面を参照して説明する。   The best mode of the present invention will be described below with reference to the drawings.

図１は、この発明の一実施例に係るコモンモードチョークコイルを示す斜視図であり、図２は、実施例のコモンモードチョークコイルの正面図であり、図３は、コモンモードチョークコイルの底面を示す斜視図である。   1 is a perspective view showing a common mode choke coil according to one embodiment of the present invention, FIG. 2 is a front view of the common mode choke coil of the embodiment, and FIG. 3 is a bottom view of the common mode choke coil. FIG.

コモンモードチョークコイル１は、表面実装型の巻線コイルであり、図１及び図２に示すように、磁性コアとしてのコア２と、４つの外部電極３−１〜３−４と、１対の巻線４−１，４−２と、磁性板としての天板５とを備えている。   The common mode choke coil 1 is a surface mount type winding coil, and as shown in FIGS. 1 and 2, a core 2 as a magnetic core, four external electrodes 3-1 to 3-4, and a pair Windings 4-1 and 4-2, and a top plate 5 as a magnetic plate.

コア２は、Mn-Zn系フェライト、Ni-Zn系フェライト等のフェライトで形成されており、中央の巻芯部２０とその両端に設けられた第１の鍔部としての鍔部２１及び第２の鍔部としての鍔部２２とで構成されている。   The core 2 is made of ferrite such as Mn—Zn ferrite, Ni—Zn ferrite, etc., and has a central core portion 20 and flange portions 21 and 2 as first flange portions provided at both ends thereof. It is comprised with the collar part 22 as a collar part.

外部電極３−１〜３−４は、鍔部２１，２２の下部に形成されている。
具体的には、図３に示すように、外部電極３−１，３−２が鍔部２１の脚部２１ａ，２１ｂにそれぞれ形成され、外部電極３−３，３−４が鍔部２２の脚部２２ａ，２２ｂにそれぞれ形成されている。 The external electrodes 3-1 to 3-4 are formed below the flange portions 21 and 22.
Specifically, as shown in FIG. 3, the external electrodes 3-1 and 3-2 are formed on the legs 21 a and 21 b of the flange 21, and the external electrodes 3-3 and 3-4 are of the flange 22. Legs 22a and 22b are formed respectively.

図２において、１対の巻線４−１，４−２は、それぞれ銅線を絶縁膜で被覆して成るラインであり、コア２の巻芯部２０に巻装され、図３にも示すように、巻線４−１，４−２の端部４−１ａ，４−２ａが外部電極３−１，３−２側に引き出されて、外部電極３−１，３−２にそれぞれ接合されると共に、巻線４−１，４−２の端部４−１ｂ，４−２ｂが外部電極３−３，３−４側に引き出されて、外部電極３−３，３−４にそれぞれ接合されている。   In FIG. 2, a pair of windings 4-1 and 4-2 are lines each formed by coating a copper wire with an insulating film, wound around the core portion 20 of the core 2, and also shown in FIG. As described above, the ends 4-1a and 4-2a of the windings 4-1 and 4-2 are drawn out to the external electrodes 3-1 and 3-2 and joined to the external electrodes 3-1 and 3-2, respectively. At the same time, the ends 4-1b and 4-2b of the windings 4-1 and 4-2 are drawn out to the external electrodes 3-3 and 3-4, and are respectively connected to the external electrodes 3-3 and 3-4. It is joined.

図１に示す天板５もコア２と同様に、Mn-Zn系フェライト、Ni-Zn系フェライト等のフェライトで形成されている。そして、図２にも示すように、この天板５の下側には、この実施例の特徴である抵抗部６が接着剤７によって鍔部２１，２２の上端面２１ｃ，２２ｃに接合されている。なお、この接着剤７には、磁粉が混入されており、コア２と抵抗部６とを接合するだけでなく、これらの間の磁気特性をも向上させている。   Similarly to the core 2, the top plate 5 shown in FIG. 1 is also made of ferrite such as Mn—Zn ferrite, Ni—Zn ferrite. As shown in FIG. 2, the resistance portion 6, which is a feature of this embodiment, is joined to the upper end surfaces 21 c and 22 c of the flange portions 21 and 22 by the adhesive 7 below the top plate 5. Yes. Note that magnetic powder is mixed in the adhesive 7, and not only the core 2 and the resistance portion 6 are joined, but also the magnetic characteristics between them are improved.

図４は、抵抗部６を示す部分拡大断面図である。
抵抗部６は、図４に示すように、３層の金属膜６１〜６３と２層の磁性板片５１，５２とを、鍔部２１（２２）の上端面２１ｃ（２２ｃ）と天板５の下面５ｂとの間に交互に積層した構成を成す。具体的には、金属膜６１が天板５の下面５ｂに形成され、下面に金属膜６２を有した磁性板片５１が、金属膜６１の下に接着剤７１を介して接合されている。さらに、下面に金属膜６３を有した磁性板片５２が、金属膜６２の下に接着剤７２を介して接合されている。そして、金属膜６３が、鍔部２１（２２）の上端面２１ｃ（２２ｃ）に塗布された接着剤７に接合されている。
このような抵抗部６において、磁性板片５１，５２も、天板５と同様に、Mn-Zn系フェライト、Ni-Zn系フェライト等のフェライトで形成され、接着剤７１，７２も、接着剤７と同様に磁粉が混入されている。
また、金属膜６１〜６３は、鉄，コバルト，ニッケル，クロム，マンガン及び銅の内の少なくともいずれかを含む強磁性体によって形成されている。但し、ニクロムを主成分とする強磁性体で形成することがより好ましい。 FIG. 4 is a partial enlarged cross-sectional view showing the resistance portion 6.
As shown in FIG. 4, the resistance portion 6 includes three layers of metal films 61 to 63 and two layers of magnetic plate pieces 51 and 52, an upper end surface 21 c (22 c) of the flange portion 21 (22), and the top plate 5. The structure which laminated | stacked alternately between lower surface 5b of this is comprised. Specifically, the metal film 61 is formed on the lower surface 5 b of the top plate 5, and the magnetic plate piece 51 having the metal film 62 on the lower surface is joined to the metal film 61 via the adhesive 71. Further, a magnetic plate piece 52 having a metal film 63 on the lower surface is joined to the metal film 62 via an adhesive 72. The metal film 63 is bonded to the adhesive 7 applied to the upper end surface 21c (22c) of the flange portion 21 (22).
In such a resistance portion 6, the magnetic plate pieces 51 and 52 are also formed of ferrite such as Mn—Zn ferrite and Ni—Zn ferrite, as with the top plate 5, and the adhesives 71 and 72 are also adhesives. As in 7, magnetic powder is mixed.
The metal films 61 to 63 are formed of a ferromagnetic material including at least one of iron, cobalt, nickel, chromium, manganese, and copper. However, it is more preferable to use a ferromagnetic material mainly composed of nichrome.

次に、抵抗部６の機能について説明する。
図５は、抵抗部６の機能を説明するための図１の矢視Ａ−Ａ断面図であり、図６は、金属膜６１〜６３に発生する渦電流Ｉを示す部分拡大断面図である。
コモンモードチョークコイル１が上記構成を採ることにより、所定周波数の信号がコモンモードチョークコイル１に入力されると、図５の矢印で示すように、信号に対応した磁力線Ｈが、巻芯部２０と鍔部２１，２２と天板５とに沿って発生する。
このとき、抵抗部６が、磁力線Ｈの通過部位に形成されているので、この抵抗部６がコモンモードチョークコイル１の抵抗成分として機能する。
具体的には、図６に示すように、鍔部２１（２２）から天板５に至る磁力線Ｈが、抵抗部６の金属膜６１〜６３を通るため、この磁力線Ｈによって、渦電流Ｉが、金属膜６１〜６３の各表面に発生する。この結果、１対の巻線４−１，４−２（図５参照）を流れる信号のエネルギーが消耗され、抵抗部６の金属膜６１〜６３が１対の巻線４−１，４−２を流れる信号に対する抵抗として機能することとなる。 Next, the function of the resistance unit 6 will be described.
FIG. 5 is a cross-sectional view taken along the line AA of FIG. 1 for explaining the function of the resistance portion 6, and FIG. 6 is a partial enlarged cross-sectional view showing the eddy current I generated in the metal films 61 to 63. .
When the common mode choke coil 1 adopts the above-described configuration, when a signal having a predetermined frequency is input to the common mode choke coil 1, the magnetic field lines H corresponding to the signal are shown in FIG. And along the flanges 21 and 22 and the top plate 5.
At this time, since the resistance portion 6 is formed at the passage of the magnetic lines of force H, the resistance portion 6 functions as a resistance component of the common mode choke coil 1.
Specifically, as shown in FIG. 6, since the magnetic lines H extending from the flange 21 (22) to the top plate 5 pass through the metal films 61 to 63 of the resistor 6, the eddy current I is generated by the magnetic lines H. And occurs on each surface of the metal films 61 to 63. As a result, the energy of the signal flowing through the pair of windings 4-1 and 4-2 (see FIG. 5) is consumed, and the metal films 61 to 63 of the resistance portion 6 are paired with the pair of windings 4-1 and 4- 2 will function as a resistance to the signal flowing through 2.

次いで、このようなコモンモードチョークコイル１の製造方法について説明する。
図７は、コモンモードチョークコイル１の製造方法の第１工程を示す工程図であり、図８は、コモンモードチョークコイル１の製造方法の第２工程を示す工程図である。
第１工程は、図７に示すように、コモンモードチョークコイル本体を製造する工程である。具体的には、図７の（ａ）に示すように、コア２を形成した後、図７の（ｂ）に示すように、外部電極３−１〜３−４をコア２の鍔部２１，２２下部に塗布する。そして、図７の（ｃ）に示すように、巻線４−１，４−２をコア２の巻芯部２０に巻回して、端部４−１ａ，４−２ａと端部４−１ｂ，４−２ｂとを、外部電極３−１，３−２と外部電極３−３，３−４とにそれぞれ接合する。しかる後、図７の（ｄ）に示すように、接着剤７を鍔部２１，２２の上端面に塗布する。 Next, a method for manufacturing such a common mode choke coil 1 will be described.
FIG. 7 is a process diagram showing a first process of the method for manufacturing the common mode choke coil 1, and FIG. 8 is a process chart showing a second process of the method for manufacturing the common mode choke coil 1.
The first step is a step of manufacturing a common mode choke coil body as shown in FIG. Specifically, as shown in FIG. 7A, after the core 2 is formed, the external electrodes 3-1 to 3-4 are connected to the flange portion 21 of the core 2 as shown in FIG. , 22 is applied to the bottom. Then, as shown in FIG. 7C, the windings 4-1 and 4-2 are wound around the core part 20 of the core 2, and the end parts 4-1 a and 4-2 a and the end part 4-1 b. , 4-2b are joined to the external electrodes 3-1 and 3-2 and the external electrodes 3-3 and 3-4, respectively. Thereafter, as shown in FIG. 7D, the adhesive 7 is applied to the upper end surfaces of the flange portions 21 and 22.

一方、第２工程は、図８に示すように、天板５と抵抗部６とを製造する工程であり、第１工程と平行して実行される。
具体的には、図８の（ａ）に示すように、天板５を形成する。そして、図８の（ｂ）に示すように、メッキ等の手段により、抵抗部６の金属膜６１をこの天板５の下面５ｂに形成する。次に、図８の（ｃ）に示すように、磁性板片５１の下面に金属膜６２を形成した後、この磁性板片５１を金属膜６１の下に接着剤７１を介して接合する。そして、図８の（ｄ）に示すように、最後に、磁性板片５２の下面に金属膜６３を形成した後、この磁性板片５２を金属膜６２の下に接着剤７２を介して接合する。これにより、抵抗部６が天板５の下面５ｂに形成される。 On the other hand, as shown in FIG. 8, the second step is a step of manufacturing the top plate 5 and the resistance portion 6 and is performed in parallel with the first step.
Specifically, the top plate 5 is formed as shown in FIG. Then, as shown in FIG. 8B, a metal film 61 of the resistance portion 6 is formed on the lower surface 5b of the top plate 5 by means such as plating. Next, as shown in FIG. 8C, after a metal film 62 is formed on the lower surface of the magnetic plate piece 51, the magnetic plate piece 51 is bonded to the metal film 61 via an adhesive 71. 8D, finally, after forming a metal film 63 on the lower surface of the magnetic plate piece 52, the magnetic plate piece 52 is bonded under the metal film 62 via an adhesive 72. To do. As a result, the resistance portion 6 is formed on the lower surface 5 b of the top plate 5.

上記第１及び第２工程を実行した後、図２に示すように、第１工程で作成された抵抗部６付きの天板５を、第１工程で作成されたコア２の鍔部２１，２２の上端面２１ｃ，２２ｃに接着剤７で接着させることにより、コモンモードチョークコイル１を製造することができる。   After performing the first and second steps, as shown in FIG. 2, the top plate 5 with the resistance portion 6 created in the first step is replaced with the flange portion 21 of the core 2 created in the first step. The common mode choke coil 1 can be manufactured by adhering to the upper end surfaces 21c, 22c of the 22 with the adhesive 7.

次に、この実施例のコモンモードチョークコイルが示す作用及び効果について説明する。
図９は、イミュニティ試験におけるコモンモードチョークコイル１の作用及び効果を説明するための概略ブロック図である。
図９において、符号１００，１０１は、送信ＩＣ，受信ＩＣであり、これら送信ＩＣ１００と受信ＩＣ１０１とが差動伝送路１１１，１１２で接続されている。そして、コモンモードノイズＮを発生させるためのノイズ発生器１２０が送信ＩＣ１００側の差動伝送路１１１，１１２部位に配置されている。
コモンモードチョークコイル１は、このような差動伝送路１１１，１１２上であって、受信ＩＣ１０１側に近い部位に接続した。具体的には、外部電極３−２，３−４を差動伝送路１１１に接続すると共に、外部電極３−１，３−３を差動伝送路１１２に接続した。
かかる状態で、差動信号Ｓ１，Ｓ１′を送信ＩＣ１００から差動伝送路１１１，１１２に出力すると共に、ノイズ発生器１２０を用いて、所定周波数範囲のコモンモードノイズＮを差動伝送路１１１，１１２上に発生させる。
すると、コモンモードノイズＮが載った差動信号Ｓ２，Ｓ２′がコモンモードチョークコイル１側に向かって伝送され、外部電極３−１，３−２を通じてコモンモードチョークコイル１内に入力される。そして、この差動信号Ｓ２，Ｓ２′が巻線４−１，４−２と抵抗Ｒ，Ｒを通り、外部電極３−３，３−４を通じて、差動信号Ｓ３，Ｓ３′として差動伝送路１１１，１１２に出力される。 Next, the operation and effect of the common mode choke coil of this embodiment will be described.
FIG. 9 is a schematic block diagram for explaining the operation and effect of the common mode choke coil 1 in the immunity test.
In FIG. 9, reference numerals 100 and 101 denote a transmission IC and a reception IC, and the transmission IC 100 and the reception IC 101 are connected by differential transmission paths 111 and 112. And the noise generator 120 for generating the common mode noise N is arrange | positioned in the differential transmission path 111,112 site | part by the side of transmission IC100.
The common mode choke coil 1 is connected to a portion on the differential transmission lines 111 and 112 close to the receiving IC 101 side. Specifically, the external electrodes 3-2 and 3-4 were connected to the differential transmission path 111, and the external electrodes 3-1 and 3-3 were connected to the differential transmission path 112.
In this state, the differential signals S1 and S1 ′ are output from the transmission IC 100 to the differential transmission lines 111 and 112, and the common mode noise N in a predetermined frequency range is transmitted to the differential transmission lines 111 and 112 using the noise generator 120. 112 is generated.
Then, the differential signals S2 and S2 ′ carrying the common mode noise N are transmitted toward the common mode choke coil 1 and input into the common mode choke coil 1 through the external electrodes 3-1 and 3-2. The differential signals S2 and S2 'pass through the windings 4-1 and 4-2 and the resistors R and R, and are differentially transmitted as differential signals S3 and S3' through the external electrodes 3-3 and 3-4. It is output to the paths 111 and 112.

ところで、受信ＩＣ１０１の終端の容量は終端で生じる多くの容量の総和として生じる。ここでは、理解を容易にするために、これらの容量をキャパシタンス１０２で表示した。このように、受信ＩＣ１０１の終端には、キャパシタンス１０２が存在するので、コモンモードチョークコイル１の巻線４−１，４−２のインダクタンスとこのキャパシタンス１０２とが共振回路を構成する。そして、この共振回路の共振周波数は、ノイズ発生器１２０で発生させるコモンモードノイズＮの周波数範囲内に含まれるおそれがある。かかる状態では、この共振周波数及びその近傍の周波数帯域内のコモンモードノイズＮが十分抑圧されず、コモンモードノイズＮが載った差動信号Ｓ３，Ｓ３′が出力されるおそれがある。   By the way, the terminal capacitance of the receiving IC 101 is generated as a sum of many capacities generated at the terminal. Here, in order to facilitate understanding, these capacitances are represented by capacitance 102. Thus, since the capacitance 102 exists at the end of the receiving IC 101, the inductance of the windings 4-1 and 4-2 of the common mode choke coil 1 and the capacitance 102 constitute a resonance circuit. The resonance frequency of this resonance circuit may be included in the frequency range of common mode noise N generated by the noise generator 120. In this state, the common mode noise N in the resonance frequency and the frequency band in the vicinity thereof is not sufficiently suppressed, and the differential signals S3 and S3 ′ carrying the common mode noise N may be output.

しかしながら、この実施例のコモンモードチョークコイル１では、３層の金属膜６１〜６３を備える抵抗部６を天板５の下面５ｂと鍔部２１（２２）の上端面２１ｃ（２２ｃ）との間に介設して、図５及び図６に示したように、磁力線Ｈがこの抵抗部６の金属膜６１〜６３を必ず通過するようにしたので、金属膜６１〜６３上における渦電流Ｉの発生によって、上記共振周波数及びその近傍の周波数帯域内のコモンモードノイズＮに対する抵抗成分Ｒが増加し、この抵抗成分ＲがコモンモードノイズＮを抑圧する。この結果、イミュニティ試験における全ての周波数帯域のコモンモードノイズＮに対して、良好なノイズ抑圧効果を発揮する。   However, in the common mode choke coil 1 of this embodiment, the resistance portion 6 including the three layers of the metal films 61 to 63 is disposed between the lower surface 5b of the top plate 5 and the upper end surface 21c (22c) of the flange portion 21 (22). As shown in FIGS. 5 and 6, the magnetic lines of force H always pass through the metal films 61 to 63 of the resistance portion 6, so that the eddy current I on the metal films 61 to 63 is increased. Due to the occurrence, the resistance component R with respect to the common mode noise N in the resonance frequency and the frequency band in the vicinity thereof increases, and the resistance component R suppresses the common mode noise N. As a result, a good noise suppression effect is exhibited for common mode noise N in all frequency bands in the immunity test.

かかる作用及び効果を確認すべく、発明者は次のような実験を行った。
図１０は、抵抗部６の金属膜の層数とコモンモードチョークコイルのコモンモードの抵抗成分Ｒの値との関係を示す線図であり、図１１は、実験に使用したコモンモードチョークコイルの寸法説明図である。 In order to confirm this action and effect, the inventor conducted the following experiment.
FIG. 10 is a diagram showing the relationship between the number of metal film layers of the resistor section 6 and the value of the common mode resistance component R of the common mode choke coil. FIG. 11 shows the common mode choke coil used in the experiment. It is dimension explanatory drawing.

この実験では、抵抗部６の金属膜が０層，１層及び２層の各コモンモードチョークコイルを作成し、各コモンモードチョークコイルに対して、３ＭＨｚの信号を入力し、各コモンモードチョークコイルのコモンモードの抵抗成分Ｒの値（Ω）を測定した。
具体的には、図１１の（ａ）及び（ｂ）に示すように、誤差±０．２ｍｍの範囲で、長さＬ１，幅Ｌ２及び高さＨが４．５ｍｍ，３．２ｍｍ及び２．６ｍｍで、各外部電極３−１（３−２〜３−４）の縦Ｍ１及び横Ｍ２が０．６ｍｍ及び０．８ｍｍで、１対の巻線４−１，４−２のターン数が２９ターンであるコモンモードチョークコイルを作成した。そして、抵抗部６の幅Ｌ３を０．８５ｍｍに設定し、金属膜が０層，１層及び２層の各コモンモードチョークコイルに対して、上記周波数の信号を入力した。
すると、図１０の曲線Ｓで示すように、金属膜が０層の場合、即ち抵抗部６を設けない場合には、抵抗成分Ｒの値は、約３８０Ωであり、金属膜が１層の抵抗部６を設けた場合には、抵抗成分Ｒの値は、約７００Ωに上昇し、金属膜が２層の抵抗部６を設けた場合には、抵抗成分Ｒの値は、約８５０Ωに達した。
すなわち、抵抗部６の金属膜の層数の増加に従って、抵抗成分Ｒの抵抗値も増加することが確認された。つまり、金属膜が多い抵抗部６を設けることにより、イミュニティ試験における全ての周波数帯域のコモンモードノイズＮに対して、より良好なノイズ抑圧効果を得ることができることを確認することができた。 In this experiment, each of the common mode choke coils in which the metal film of the resistance portion 6 has 0 layer, 1 layer, and 2 layers is created, and a 3 MHz signal is input to each common mode choke coil. The value (Ω) of the resistance component R of the common mode was measured.
Specifically, as shown in FIGS. 11A and 11B, the length L1, the width L2, and the height H are 4.5 mm, 3.2 mm, and 2. 6 mm, the vertical M1 and horizontal M2 of each external electrode 3-1 (3-2 to 3-4) are 0.6 mm and 0.8 mm, and the number of turns of the pair of windings 4-1 and 4-2 is A common mode choke coil with 29 turns was created. Then, the width L3 of the resistance portion 6 was set to 0.85 mm, and a signal having the above frequency was input to each of the common mode choke coils having the 0th layer, the first layer, and the second layer of the metal film.
Then, as shown by the curve S in FIG. 10, when the metal film has zero layer, that is, when the resistance portion 6 is not provided, the resistance component R has a value of about 380Ω, and the metal film has one layer of resistance. When the portion 6 is provided, the value of the resistance component R increases to about 700Ω, and when the metal film is provided with the two-layer resistance portion 6, the value of the resistance component R reaches about 850Ω. .
That is, it was confirmed that the resistance value of the resistance component R increases as the number of layers of the metal film of the resistance portion 6 increases. That is, it was confirmed that by providing the resistor portion 6 with a large amount of metal film, a better noise suppression effect can be obtained for the common mode noise N in all frequency bands in the immunity test.

なお、この発明は、上記実施例に限定されるものではなく、発明の要旨の範囲内において種々の変形や変更が可能である。
例えば、上記実施例では、抵抗部６の金属膜の層数を３としたが、金属膜の層数は、２以上であれば、その数に限定はない。
また、上記実施例では、コア２と天板５と磁性板片５１，５２とを、それぞれフェライトで形成したが、これらの部材をフェライト以外の磁性体で形成したコモンモードチョークコイルを、この発明の範囲から除外する意ではない。
さらに、上記実施例では、磁粉を接着剤７，７１，７２に混入した例を示したが、磁粉が混入されていない接着剤を使ったコモンモードチョークコイルをこの発明の範囲から除外する意ではない。
さらに、上記実施例では外部電極３−１〜３−４をコア２の鍔部２１，２２に直接塗布して形成したが、他の形態、例えば金属端子により鍔部２に外部電極を形成したコモンモードチョークコイルをこの発明の範囲から除外する意ではない。 In addition, this invention is not limited to the said Example, A various deformation | transformation and change are possible within the range of the summary of invention.
For example, in the above embodiment, the number of metal films of the resistance portion 6 is three, but the number of metal films is not limited as long as the number of metal films is two or more.
Moreover, in the said Example, although the core 2, the top plate 5, and the magnetic plate pieces 51 and 52 were each formed with the ferrite, the common mode choke coil which formed these members with magnetic bodies other than a ferrite is this invention. It is not intended to be excluded from the scope.
Furthermore, in the said Example, although the example which mixed the magnetic powder in the adhesives 7, 71, and 72 was shown, it does not mean that the common mode choke coil using the adhesive in which the magnetic powder is not mixed is excluded from the scope of the present invention. Absent.
Further, in the above embodiment, the external electrodes 3-1 to 3-4 are formed by directly applying to the flange portions 21 and 22 of the core 2, but the external electrodes are formed on the flange portion 2 by other forms, for example, metal terminals. The common mode choke coil is not intended to be excluded from the scope of the present invention.

この発明の一実施例に係るコモンモードチョークコイルを示す斜視図である。It is a perspective view which shows the common mode choke coil which concerns on one Example of this invention. 実施例のコモンモードチョークコイルの正面図である。It is a front view of the common mode choke coil of an Example. コモンモードチョークコイルの底面を示す斜視図である。It is a perspective view which shows the bottom face of a common mode choke coil. 抵抗部を示す部分拡大断面図である。It is a partial expanded sectional view which shows a resistance part. 抵抗部の機能を説明するための図１の矢視Ａ−Ａ断面図である。It is arrow AA sectional drawing of FIG. 1 for demonstrating the function of a resistance part. 金属膜に発生する渦電流を示す部分拡大断面図である。It is a partial expanded sectional view which shows the eddy current which generate | occur | produces in a metal film. コモンモードチョークコイルの製造方法の第１工程を示す工程図である。It is process drawing which shows the 1st process of the manufacturing method of a common mode choke coil. コモンモードチョークコイルの製造方法の第２工程を示す工程図である。It is process drawing which shows the 2nd process of the manufacturing method of a common mode choke coil. イミュニティ試験におけるコモンモードチョークコイルの作用及び効果を説明するための概略ブロック図である。It is a schematic block diagram for demonstrating the effect | action and effect of a common mode choke coil in an immunity test. 抵抗部の金属膜の層数とコモンモードチョークコイルのコモンモードの抵抗成分の値との関係を示す線図である。It is a diagram which shows the relationship between the number of layers of the metal film of a resistance part, and the value of the resistance component of the common mode of a common mode choke coil. 実験に使用したコモンモードチョークコイルの寸法説明図である。It is dimension explanatory drawing of the common mode choke coil used for experiment.

符号の説明Explanation of symbols

１…コモンモードチョークコイル、 ２…コア、 ３−１〜３−４…外部電極、 ４−１，４−２…巻線、 ４−１ａ，４−１ｂ，４−２ａ，４−２ｂ…端部、 ５…天板、 ５ｂ…下面、 ６…抵抗部、 ７，７１，７２…接着剤、 ２０…巻芯部、 ２１，２２…鍔部、 ２１ａ，２１ｂ，２２ａ，２２ｂ…脚部、 ２１ｃ，２２ｃ…上端面、 ５１，５２…磁性板片、 ６１〜６３…金属膜、 １００…送信ＩＣ、 １０１…受信ＩＣ、 １０２…キャパシタンス、 １１１，１１２…差動伝送路、 １２０…ノイズ発生器、 Ｈ…磁力線、 Ｉ…渦電流。   DESCRIPTION OF SYMBOLS 1 ... Common mode choke coil, 2 ... Core, 3-1 to 3-4 ... External electrode, 4-1, 4-2 ... Winding, 4-1a, 4-1b, 4-2a, 4-2b ... End 5 ... Top plate, 5b ... Lower surface, 6 ... Resistance part, 7,71,72 ... Adhesive, 20 ... Core, 21,22 ... Ring, 21a, 21b, 22a, 22b ... Leg, 21c , 22c ... upper end surface, 51, 52 ... magnetic plate pieces, 61-63 ... metal film, 100 ... transmission IC, 101 ... reception IC, 102 ... capacitance, 111, 112 ... differential transmission path, 120 ... noise generator, H ... Magnetic field lines, I ... Eddy current.

Claims (5)

巻芯部及びこの巻芯部の両端部にそれぞれ設けられた第１及び第２の鍔部を有して成る磁性コアと、上記第１及び第２の鍔部にそれぞれ形成された外部電極と、上記巻芯部に巻装され且つ各端部が上記外部電極まで引き出されて接合された１対の巻線と、上記第１及び第２の鍔部の上に接合される磁性板とを備えたコモンモードチョークコイルであって、
複数の金属膜と磁性板片とを、上記第１及び第２の鍔部の上端面と上記磁性板との間に交互に積層して抵抗部を形成し、この抵抗部を接着剤を介して上記第１及び第２の鍔部の上記上端面と上記磁性板との間に接合した、
ことを特徴とするコモンモードチョークコイル。 A magnetic core having first and second flanges provided on both ends of the winding core and the winding core, and external electrodes formed on the first and second flanges, respectively. A pair of windings wound around the winding core and each end portion being drawn out to the external electrode and joined, and a magnetic plate joined on the first and second flanges. A common mode choke coil comprising:
A plurality of metal films and magnetic plate pieces are alternately laminated between the upper end surfaces of the first and second flanges and the magnetic plate to form a resistance portion, and the resistance portion is interposed with an adhesive. The first and second flanges are joined between the upper end surface and the magnetic plate.
A common mode choke coil. 請求項１に記載のコモンモードチョークコイルにおいて、
上記金属膜を、鉄，コバルト，ニッケル，クロム，マンガン及び銅の内の少なくともいずれかを含む強磁性体で形成した、
ことを特徴とするコモンモードチョークコイル。 The common mode choke coil according to claim 1,
The metal film is formed of a ferromagnetic material including at least one of iron, cobalt, nickel, chromium, manganese, and copper.
A common mode choke coil. 請求項２に記載のコモンモードチョークコイルにおいて、
上記金属膜を、ニクロムを主成分とする強磁性体の合金で形成した、
ことを特徴とするコモンモードチョークコイル。 The common mode choke coil according to claim 2,
The metal film is formed of a ferromagnetic alloy mainly composed of nichrome,
A common mode choke coil. 請求項１ないし請求項３のいずれかに記載のコモンモードチョークコイルにおいて、
上記磁性コアと上記磁性板と磁性板片とを、それぞれフェライトで形成した、
ことを特徴とするコモンモードチョークコイル。 The common mode choke coil according to any one of claims 1 to 3,
Each of the magnetic core, the magnetic plate, and the magnetic plate piece is formed of ferrite.
A common mode choke coil. 請求項１ないし請求項４のいずれかに記載のコモンモードチョークコイルにおいて、
上記接着剤に、磁粉を混入した、
ことを特徴とするコモンモードチョークコイル。 The common mode choke coil according to any one of claims 1 to 4,
Magnetic powder was mixed in the adhesive,
A common mode choke coil.
JP2007170790A 2007-06-28 2007-06-28 Common mode choke coil Active JP4835946B2 (en)

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JP2010165862A (en) * 2009-01-15 2010-07-29 Tdk Corp Common mode filter
CN108962560A (en) * 2018-09-07 2018-12-07 广州金升阳科技有限公司 Micropower modular power source of the chip around line transformer and its manufacturing method and comprising the transformer
JP2019012894A (en) * 2017-06-29 2019-01-24 矢崎総業株式会社 Noise filter and noise reduction unit
CN109817411A (en) * 2017-11-18 2019-05-28 株式会社村田制作所 Coil component

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JP2002141230A (en) * 2000-11-02 2002-05-17 Tdk Corp Thin core and inductive device using the same
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JP2000269050A (en) * 1999-03-16 2000-09-29 Taiyo Yuden Co Ltd Common-mode choke coil
JP2001093756A (en) * 1999-09-20 2001-04-06 Tdk Corp Common mode filter
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Publication number Priority date Publication date Assignee Title
JP2010165862A (en) * 2009-01-15 2010-07-29 Tdk Corp Common mode filter
JP2019012894A (en) * 2017-06-29 2019-01-24 矢崎総業株式会社 Noise filter and noise reduction unit
US11049646B2 (en) 2017-06-29 2021-06-29 Yazaki Corporation Noise filter and noise reduction unit
CN109817411A (en) * 2017-11-18 2019-05-28 株式会社村田制作所 Coil component
CN108962560A (en) * 2018-09-07 2018-12-07 广州金升阳科技有限公司 Micropower modular power source of the chip around line transformer and its manufacturing method and comprising the transformer
CN108962560B (en) * 2018-09-07 2024-04-12 广州金升阳科技有限公司 Sheet-type wound transformer, manufacturing method thereof and micro-power module power supply comprising sheet-type wound transformer

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