JP2010212271A - Low-profile inductor - Google Patents

Low-profile inductor Download PDF

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JP2010212271A
JP2010212271A JP2009053340A JP2009053340A JP2010212271A JP 2010212271 A JP2010212271 A JP 2010212271A JP 2009053340 A JP2009053340 A JP 2009053340A JP 2009053340 A JP2009053340 A JP 2009053340A JP 2010212271 A JP2010212271 A JP 2010212271A
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core
resin bobbin
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magnetic
bobbin
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Yutaka Ikeda
豊 池田
Genichiro Suzuki
元一郎 鈴木
Yuko Kanazawa
祐子 金澤
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FDK Corp
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FDK Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To cope with a large current and a high voltage, and to further reduce height while maintaining sufficient reliability. <P>SOLUTION: In a low-profile inductor, winding 22 is wound around a resin bobbin 20 in a flat structure including flanges 26, 28 at both the ends of a cylindrical drum section 24, a magnetic core is assembled, and a center magnetic path including a required magnetic gap and a peripheral magnetic path are formed inside the drum of the resin bobbin and outside the resin bobbin, respectively by the magnetic core. The magnetic core includes at least an upper core 30 and a lower core 32, the winding axis of the resin bobbin is in a direction vertical to a mount surface, and the upper and lower cores are adhered to the upper and lower flanges, respectively, of the resin bobbin for assembly. The upper and lower cores are mutually in a non-collision state (gap is present) in the peripheral magnetic path. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、巻軸が実装面（実装基板との対向面）に垂直となるように巻線を施した偏平な樹脂ボビンに、上コアと下コアを組み付ける縦配置形式のインダクタに関し、更に詳しく述べると、上コアを樹脂ボビンの上フランジに、下コアを樹脂ボビンの下フランジに、それぞれ密着させ、外周磁路でコア同士が互いに非衝合状態（接触しておらず、隙間が空いている状態）となっている低背型インダクタに関するものである。この技術は、例えば電源回路で使用する薄型のトランスやチョークコイル等に有用である。   The present invention relates to a vertically arranged inductor in which an upper core and a lower core are assembled to a flat resin bobbin that is wound so that a winding axis is perpendicular to a mounting surface (a surface facing a mounting substrate). In other words, the upper core is in close contact with the upper flange of the resin bobbin, and the lower core is in close contact with the lower flange of the resin bobbin. The low-profile inductor. This technique is useful for thin transformers and choke coils used in power supply circuits, for example.

近年、各種電子機器の小型化、薄型化の要求に伴い、電源回路に用いるチョークコイルやトランス等のインダクタについても小型化、薄型化が進められている。これに伴い、偏平構造（フランジ径に対して軸方向長さが短い構造）の樹脂ボビンに巻線を施し、該樹脂ボビンに上コアと下コアからなる磁気コアを組み付ける低背型（実装時の高さ寸法が小さい）のインダクタが用いられている。   In recent years, along with demands for various electronic devices to be reduced in size and thickness, inductors such as choke coils and transformers used in power supply circuits have also been reduced in size and thickness. Along with this, a low profile type (when mounting), winding a resin bobbin with a flat structure (a structure with a short axial length relative to the flange diameter) and assembling a magnetic core consisting of an upper core and a lower core on the resin bobbin Inductors with a small height dimension) are used.

従来技術の例を図５に示す。通常、樹脂ボビン１０は円筒型の巻胴部の両端にフランジを備えた一体構造であり、上コアと下コアは、同形の縦断面Ｅ型のコア１２，１４の組み合わせ（図５の（Ａ）参照）、あるいは縦断面Ｉ型のコア１６と縦断面Ｅ型のコア１８の組み合わせ（図５の（Ｂ）参照）である。樹脂ボビンの巻胴部内を通る中央磁路に必要な磁気ギャップを設け、外周磁路では上コアと下コアを衝き合わせて固定し閉磁路とする。その場合、磁気コアの寸法公差及び樹脂ボビンの寸法変化などを考慮し、コア外脚部の寸法（長さ）を樹脂ボビンの高さよりも長く設定し、上コア及び下コアと樹脂ボビンとの嵌め込み部分に一定のクリアランスを確保しておく必要がある。つまり、磁気コアは、樹脂ボビンの少なくとも一方のフランジには接触せず、ある程度の隙間ｃが空いた状態で組み付けられている。そのような関係にしておかなければ、磁気コアの寸法公差、あるいは樹脂ボビンの周囲温度変動による膨張／収縮により磁気コアに過大なストレスがかかり、コア割れ等の不具合が発生する恐れがあるためである。   An example of the prior art is shown in FIG. In general, the resin bobbin 10 has an integral structure with flanges at both ends of a cylindrical winding body, and the upper core and the lower core are a combination of cores 12 and 14 having the same shape of the vertical section E (FIG. 5A). )) Or a combination of a core 16 having a longitudinal section I and a core 18 having a longitudinal section E (see FIG. 5B). A necessary magnetic gap is provided in the central magnetic path passing through the winding body of the resin bobbin, and the upper magnetic core and the lower core are abutted and fixed in the outer peripheral magnetic path to form a closed magnetic path. In that case, considering the dimensional tolerance of the magnetic core and the dimensional change of the resin bobbin, the dimension (length) of the core outer leg is set to be longer than the height of the resin bobbin, and the upper and lower cores and the resin bobbin It is necessary to ensure a certain clearance at the fitting portion. That is, the magnetic core does not contact at least one flange of the resin bobbin and is assembled with a certain gap c. Otherwise, the magnetic core may be overstressed due to dimensional tolerances of the magnetic core or expansion / contraction due to fluctuations in the ambient temperature of the resin bobbin, which may cause problems such as core cracks. is there.

周知のように、最近の液晶テレビでは益々薄型化が進んでいる。それに対応すべく、例えばバックライトパネルの放電管駆動回路に使用するインダクタ（インバータトランスやチョークコイル）も、より一層の薄型化が求められており、上記のような磁気コアと樹脂ボビンとのクリアランス分の厚みすら無視できなくなりつつある。   As is well known, recent liquid crystal televisions are becoming thinner and thinner. To cope with this, for example, inductors (inverter transformers and choke coils) used in the discharge tube drive circuit of the backlight panel are required to be further reduced in thickness, and the clearance between the magnetic core and the resin bobbin as described above is required. Even the thickness of the minute is becoming difficult to ignore.

インダクタを薄型化するための方策としては、一方のフランジを省いたような形状の樹脂ボビンを使用する構成（特許文献１参照）、あるいは融着コイルを用い、絶縁フィルムを介して上下のコアで融着コイルを挟む構成（特許文献２参照）などが提案されている。しかし、電源回路に用いるインダクタでは大電流化、高耐圧化の要求があるが、前者のような構成では、コイルとコアとの間の絶縁性（耐電圧）の点で問題がある。また、後者のような構成では、融着性絶縁電線を巻線した融着コイルが必要なこと、及び絶縁フィルムを融着コイルと上下のコアとの間に介装する必要があることなどのため、大電流を流すような用途には不向きであるし、製造が煩瑣になる欠点がある。   As a measure for reducing the thickness of the inductor, a configuration using a resin bobbin with one flange omitted (see Patent Document 1), or using a fusion coil, with an upper and lower core through insulating films The structure (refer patent document 2) etc. which pinch | fuse a fusion | melting coil are proposed. However, an inductor used in a power supply circuit is required to have a large current and a high breakdown voltage, but the former configuration has a problem in terms of insulation (withstand voltage) between the coil and the core. In the latter configuration, a fusion coil wound with a fusion-bonded insulated wire is necessary, and an insulation film needs to be interposed between the fusion coil and the upper and lower cores. For this reason, it is unsuitable for applications in which a large current flows, and there are drawbacks in that the production becomes cumbersome.

特開平１１−３４００６０号公報JP-A-11-340060 特開平７−２６３２５４号公報JP-A-7-263254

本発明が解決しようとする課題は、大電流、高電圧に対応でき、十分な信頼性を維持しつつ一層の低背化を図ることができるようにすることである。   The problem to be solved by the present invention is to be able to cope with a large current and a high voltage and to further reduce the height while maintaining sufficient reliability.

本発明は、巻線を施した樹脂ボビンの上フランジに上コアを、下フランジに下コアを、それぞれ密着させ、前記樹脂ボビンの外側の外周磁路でコア同士が互いに衝合せず隙間が空いた状態になっている低背型インダクタである。このように本発明では、上下のコアとフランジとが密着状態となっていて、磁気コアの寸法公差や樹脂ボビンの周囲温度変動に起因する寸法変化（膨張／収縮）などを、コアとボビンとのクリアランスで吸収するのではなく、コア同士を非衝合とし隙間を設けることで吸収するように構成しており、その点に主要な特徴がある。   In the present invention, the upper core is attached to the upper flange of the resin bobbin with the winding, and the lower core is closely attached to the lower flange, and the cores do not collide with each other in the outer peripheral magnetic path of the resin bobbin so that there is no gap. This is a low-profile inductor that is in a closed state. As described above, in the present invention, the upper and lower cores and the flange are in close contact with each other, and the dimensional tolerance (expansion / contraction) due to the dimensional tolerance of the magnetic core and the ambient temperature fluctuation of the resin bobbin Instead of absorbing with the clearance of the core, the cores are configured to absorb by disengaging the cores and providing a gap, and this is a major feature.

本発明に係る低背型インダクタは、コアとボビンとの間にクリアランスが無い（互いに密着している）ため、そのクリアランス分に相当する高さ寸法を短縮でき、より一層の低背化（薄型化）が可能となる。その際、本発明では、両端にフランジを備えた樹脂ボビンを用いるため、コアと巻線との絶縁性は良好であり、十分な耐圧性能を確保できる。そのため、高電圧が印加され大電流が流れる電源回路などでも十分に使用できる高信頼性の低背型インダクタが得られる。   The low-profile inductor according to the present invention has no clearance between the core and the bobbin (it is in close contact with each other), so the height dimension corresponding to the clearance can be shortened, and the profile is further reduced (thinned) ). In that case, since the resin bobbin provided with the flanges at both ends is used in the present invention, the insulation between the core and the winding is good, and sufficient pressure resistance performance can be secured. Therefore, a highly reliable low-profile inductor that can be sufficiently used even in a power supply circuit in which a high voltage is applied and a large current flows can be obtained.

本発明に係る低背型インダクタの一実施例を示す説明図。Explanatory drawing which shows one Example of the low profile type inductor which concerns on this invention. 本発明の他の実施例を示す説明図。Explanatory drawing which shows the other Example of this invention. 本発明の更に他の実施例を示す説明図。Explanatory drawing which shows the further another Example of this invention. 本発明の他の実施例を示す説明図。Explanatory drawing which shows the other Example of this invention. 従来技術の説明図。Explanatory drawing of a prior art.

本発明は、筒型の巻胴部の両端にフランジを備えた樹脂ボビンに、巻線を施し、該樹脂ボビンに磁気コアを組み付け、該磁気コアによって、樹脂ボビンの巻胴部内に必要な磁気ギャップを設けた中央磁路を、樹脂ボビンの外側に外周磁路を、それぞれ形成するインダクタにおいて、前記磁気コアは、少なくとも上コアと下コアを有し、樹脂ボビンは、その巻軸が実装面に対して垂直となる向きとして、上コアを樹脂ボビンの上フランジに、下コアを樹脂ボビンの下フランジに、それぞれ密着し、コア同士は外周磁路で互いに非衝合状態になっていることを特徴とする低背型インダクタである。ここで磁気コアは、縦断面形状がＥ型のコア（以下、単に「Ｅ型コア」と略記することがある）同士の組み合わせ、あるいはＥ型コアと縦断面形状がＩ型のコア（以下、単に「Ｉ型コア」と略記することがある）との組み合わせなどである。   According to the present invention, winding is performed on a resin bobbin having flanges at both ends of a cylindrical winding body part, a magnetic core is assembled to the resin bobbin, and the magnetic core required by the magnetic core is provided in the winding body part of the resin bobbin. In an inductor for forming a central magnetic path with a gap and an outer peripheral magnetic path on the outside of a resin bobbin, the magnetic core has at least an upper core and a lower core, and the winding axis of the resin bobbin is a mounting surface The upper core is in close contact with the upper flange of the resin bobbin, the lower core is in close contact with the lower flange of the resin bobbin, and the cores are in a non-abutting state with the outer peripheral magnetic path. Is a low-profile inductor. Here, the magnetic core is a combination of cores having an E-shaped longitudinal section (hereinafter sometimes simply referred to as “E-shaped core”), or a core having an E-shaped core and an I-shaped longitudinal section (hereinafter, referred to as an “E-shaped core”). Or a combination thereof may be simply abbreviated as “I-type core”.

例えば、上コアと下コアが共にＥ型コアであって、上コアと下コアの中脚部が樹脂ボビンの巻胴部内に挿入され、それらの対向面間で必要な磁気ギャップを設け、上コアと下コアの外脚部は、それらの長さの合計が樹脂ボビンの高さよりも短く設定され、それによって上コアと下コアとの対向面が非衝合状態になっている構成がある。   For example, the upper core and the lower core are both E-shaped cores, and the middle legs of the upper core and the lower core are inserted into the winding body of the resin bobbin, and a necessary magnetic gap is provided between the opposing surfaces, The outer leg portion of the core and the lower core has a configuration in which the total length thereof is set to be shorter than the height of the resin bobbin so that the opposing surfaces of the upper core and the lower core are in a non-abutting state. .

あるいは、上コアと下コアは、一方がＥ型コア、他方がＩ型コアであって、Ｅ型コアの中脚部が樹脂ボビンの巻胴部内に挿入され、前記中脚部の先端面とＩ型コアとの間で必要な磁気ギャップを設け、Ｅ型コアの外脚部は、その長さが樹脂ボビンの高さよりも短く設定され、それによってＥ型コアの両外脚部の先端面とＩ型コアとが非衝合状態になっている構成もある。   Alternatively, one of the upper core and the lower core is an E-type core and the other is an I-type core, and the middle leg portion of the E-type core is inserted into the winding body portion of the resin bobbin, A necessary magnetic gap is provided between the I-type core and the length of the outer leg portion of the E-type core is set to be shorter than the height of the resin bobbin. There is also a configuration in which the I-type core and the I-type core are out of contact.

その他、上コアと下コアは共に無外脚の形状であって、それらとは別の外脚コアを樹脂ボビンの外側に取り付け、該外脚コアは、その長さが樹脂ボビンの高さよりも短く設定され、それによって外周磁路を形成する上コアと外脚コア、外脚コアと下コアとが、いずれも非衝合状態になっている構成でもよい。   In addition, both the upper core and the lower core have the shape of outer legs, and an outer leg core different from them is attached to the outside of the resin bobbin, and the length of the outer leg core is longer than the height of the resin bobbin. The upper core and the outer leg core, and the outer leg core and the lower core, which are set short and thereby form the outer peripheral magnetic path, may be in a non-abutting state.

また、上コアと下コアは、一方がＥ型コア、他方がＩ型コアであって、Ｅ型コアの中脚部が樹脂ボビンの巻胴部内に挿入され、前記中脚部の先端面とＩ型コアとの間で必要な磁気ギャップを設け、Ｅ型コアの外脚部内幅寸法をＩ型コアの長さよりも大きく設定し、Ｉ型コアがＥ型コアの外脚部間に遊嵌し、それによってＥ型コアの両外脚部の先端内側面とＩ型コアの両先端面とが非衝合状態になっている構成でもよい。   In addition, the upper core and the lower core, one is an E-type core and the other is an I-type core, and the middle leg portion of the E-type core is inserted into the winding body portion of the resin bobbin, A necessary magnetic gap is provided between the I-type core, the inner leg of the E-type core is set larger than the length of the I-type core, and the I-type core is loosely fitted between the outer legs of the E-type core. And the structure by which the front end inner surface of both the outer leg parts of an E type | mold core and the both front end surfaces of an I type | mold core are in the non-abutting state may be sufficient.

図１は本発明に係る低背型インダクタの一実施例を示す説明図である。ここで（Ａ）は組立前の縦断面を、（Ｂ）は組立後の縦断面を、（Ｃ）は製品の正面を、それぞれ表している。樹脂ボビン２０に巻線２２を施し、磁気コアを組み付け、インダクタを構成する。インダクタは、トランスやコイル等である。樹脂ボビンには、必要に応じて絶縁電線により１種類もしくは２種類以上の巻線を施すことは言うまでもない。   FIG. 1 is an explanatory view showing an embodiment of a low-profile inductor according to the present invention. Here, (A) represents a longitudinal section before assembly, (B) represents a longitudinal section after assembly, and (C) represents a front surface of the product. A winding 22 is applied to the resin bobbin 20 and a magnetic core is assembled to form an inductor. The inductor is a transformer, a coil, or the like. It goes without saying that one type or two or more types of windings are applied to the resin bobbin with an insulated wire as required.

樹脂ボビン２０は、円筒型の巻胴部２４の両端にフランジを備えており、フランジ径に対して巻軸方向長さが短い偏平構造である。樹脂ボビン２０は、その巻軸が実装面（図面上では水平方向の面）に対して垂直となり、巻胴部２４の上端に上フランジ２６が、下端に下フランジ２８が、それぞれ一体的に設けられている。   The resin bobbin 20 is provided with flanges at both ends of a cylindrical winding body 24 and has a flat structure in which the length in the winding axis direction is short with respect to the flange diameter. The resin bobbin 20 has a winding axis perpendicular to the mounting surface (horizontal surface in the drawing), and an upper flange 26 is integrally provided at the upper end of the winding body 24 and a lower flange 28 is integrally provided at the lower end. It has been.

磁気コアは、上コア３０と下コア３２との組み合わせである。上コア３０と下コア３２は共にＥ型コア（縦断面Ｅ型のフェライトコア）で同形である。例えば、ＥＲコアやポットコアなどでよい。上コア３０と下コア３２の中脚部が樹脂ボビン２０の巻胴部２４内に挿入され、それらの対向面間で必要な磁気ギャップが形成される。上コア３０の外脚部の長さＬａと下コア３２の外脚部の長さＬｂの合計は、樹脂ボビン２０の高さＬｃよりも短く、即ち（Ｌａ＋Ｌｂ）＜Ｌｃとなるように、設定される。   The magnetic core is a combination of the upper core 30 and the lower core 32. Both the upper core 30 and the lower core 32 are E-shaped cores (vertical E-shaped ferrite cores) and have the same shape. For example, an ER core or a pot core may be used. Middle leg portions of the upper core 30 and the lower core 32 are inserted into the winding drum portion 24 of the resin bobbin 20, and a necessary magnetic gap is formed between the facing surfaces thereof. The sum of the length La of the outer leg portion of the upper core 30 and the length Lb of the outer leg portion of the lower core 32 is set to be shorter than the height Lc of the resin bobbin 20, that is, (La + Lb) <Lc. Is done.

上コア３０は樹脂ボビン２０の上フランジ２６に、下コア３２は樹脂ボビン２０の下フランジ２８に、それぞれ密着させて組み立てる。典型的にはコアとフランジとを接着するが、コアとフランジとを密着させた状態で粘着テープを巻き回し固定することも可能である。勿論、接着とテープ固定を組み合わせてもよい。上コアと下コアの外脚部の長さの合計が樹脂ボビンの高さよりも短く設定されているので、外周磁路では上コアと下コアとは互いに非衝合状態（接触せず、隙間ｇができる状態）になる。   The upper core 30 is assembled in close contact with the upper flange 26 of the resin bobbin 20, and the lower core 32 is assembled in close contact with the lower flange 28 of the resin bobbin 20. Typically, the core and the flange are bonded, but it is also possible to wind and fix the adhesive tape in a state where the core and the flange are in close contact. Of course, bonding and tape fixing may be combined. Since the total length of the outer legs of the upper core and lower core is set to be shorter than the height of the resin bobbin, the upper core and the lower core are not in contact with each other (no contact, gap g is ready).

実際の製品では、樹脂ボビン２０の巻胴部下端もしくは下フランジに取付ベース３４が一体的に成形されており（図１の（Ｃ）参照）、該取付ベース３４には必要な個数の端子３６が植設されている。それらの端子３６を使用して巻線の端末処理と実装基板への取り付けが行われる。これらは、以下の実施例でも同様である。   In an actual product, a mounting base 34 is integrally formed on the lower end or lower flange of the winding body portion of the resin bobbin 20 (see FIG. 1C), and a necessary number of terminals 36 are provided on the mounting base 34. Has been planted. These terminals 36 are used for terminal processing of the windings and attachment to the mounting board. The same applies to the following embodiments.

このようにして得られたインダクタは、上コアと樹脂ボビンと下コアが密着して積み重ねられた状態となり、コアと樹脂ボビンとの間のクリアランスが不要なため、インダクタとしての全体の高さが最小となる。   In the inductor thus obtained, the upper core, the resin bobbin, and the lower core are in close contact with each other and no clearance is required between the core and the resin bobbin. Minimal.

図２は本発明に係る低背型インダクタの他の実施例を示す説明図である。ここで（Ａ）は組立前の縦断面を、（Ｂ）は組立後の縦断面を表している。絶縁電線を巻線した樹脂ボビンに磁気コアを組み付けることによって、インダクタを構成する。なお、樹脂ボビンについては、以下の実施例でも実施例１と同様の構造でよいので、説明を簡略化するため同一符号を用いている。樹脂ボビン２０は、巻軸が実装面に対して垂直な向きとなる円筒型の巻胴部２４の上端に上フランジ２６が、下端に下フランジ２８が、それぞれ設けられており、フランジ径に対して巻軸方向長さが短い偏平構造である。巻胴部２４に必要な巻線２２が施される。   FIG. 2 is an explanatory view showing another embodiment of the low-profile inductor according to the present invention. Here, (A) represents a longitudinal section before assembly, and (B) represents a longitudinal section after assembly. An inductor is configured by assembling a magnetic core to a resin bobbin wound with an insulated wire. In addition, about the resin bobbin, since the structure similar to Example 1 may be sufficient also in the following Examples, the same code | symbol is used in order to simplify description. The resin bobbin 20 is provided with an upper flange 26 at the upper end of a cylindrical winding body portion 24 whose winding axis is perpendicular to the mounting surface, and a lower flange 28 at the lower end. And a flat structure with a short length in the winding axis direction. The necessary winding 22 is applied to the winding body 24.

磁気コアは上コア４０と下コア４２の組み合わせである。上コア４０はＩ型コア（例えば、平板コア）であり、下コア４２はＥ型コア（例えば、ＥＲコアやポットコアなど）である。下コア４２の中脚部が樹脂ボビン２０の巻胴部２４内に挿入され、上コア４０との対向面間で必要な磁気ギャップが形成される。下コア４２の外脚部の長さＬｄは、樹脂ボビン２０の高さＬｃよりも短く（即ち、Ｌｄ＜Ｌｃ）設定される。   The magnetic core is a combination of the upper core 40 and the lower core 42. The upper core 40 is an I-type core (for example, a flat core), and the lower core 42 is an E-type core (for example, an ER core or a pot core). The middle leg portion of the lower core 42 is inserted into the winding drum portion 24 of the resin bobbin 20, and a necessary magnetic gap is formed between the surfaces facing the upper core 40. The length Ld of the outer leg portion of the lower core 42 is set to be shorter than the height Lc of the resin bobbin 20 (that is, Ld <Lc).

上コア４０を樹脂ボビン２０の上フランジ２６に、下コア４２を樹脂ボビン２０の下フランジ２８に、それぞれ接着する。下コア４２の外脚部の長さＬｄが樹脂ボビン２０の高さＬｃよりも短いので、外周磁路では上コア４０と下コア４２とは互いに非衝合状態（隙間ｇがある状態）になる。このようにして得られたインダクタは、上コア４０と樹脂ボビン２０と下コア４２が密着して積み重ねられた状態となるため、インダクタとしての全体の高さが最小となる。なお、上下を逆にして、上コアをＥ型コア、下コアをＩ型コアとしてもよいことは言うまでもない。   The upper core 40 is bonded to the upper flange 26 of the resin bobbin 20, and the lower core 42 is bonded to the lower flange 28 of the resin bobbin 20. Since the length Ld of the outer leg portion of the lower core 42 is shorter than the height Lc of the resin bobbin 20, the upper core 40 and the lower core 42 are in a non-abutting state (a state where there is a gap g) in the outer peripheral magnetic path. Become. In the inductor thus obtained, the upper core 40, the resin bobbin 20 and the lower core 42 are in close contact and stacked, so that the overall height of the inductor is minimized. It goes without saying that the upper core may be an E-type core and the lower core may be an I-type core upside down.

図３は、本発明に係る低背型インダクタの更に他の実施例を示す説明図である。ここで（Ａ）は組立前の縦断面を、（Ｂ）は組立後の縦断面を表している。巻線２２を施した樹脂ボビン２０に磁気コアを組み付けることでインダクタを構成する。樹脂ボビン２０は、巻軸が実装面に対して垂直な向きとなる円筒型の巻胴部２４の上端に上フランジ２６が、下端に下フランジ２８が、それぞれ設けられており、フランジ径に対して巻軸方向長さが短い偏平構造である。   FIG. 3 is an explanatory view showing still another embodiment of the low profile inductor according to the present invention. Here, (A) represents a longitudinal section before assembly, and (B) represents a longitudinal section after assembly. An inductor is configured by assembling a magnetic core to the resin bobbin 20 provided with the winding 22. The resin bobbin 20 is provided with an upper flange 26 at the upper end of a cylindrical winding body portion 24 whose winding axis is perpendicular to the mounting surface, and a lower flange 28 at the lower end. And a flat structure with a short length in the winding axis direction.

磁気コアは、上コア４４と下コア４６、及び複数の角棒状の外脚コア４８などの組み合わせである。上コア４４及び下コア４６は共にＩ型コア（例えば、平板コア）である。ここでは、中脚コア４９を下コア４６の中央に固着し、該中脚コア４９が樹脂ボビン２０の巻胴部２４内に挿入されるようにし、上コア４４との対向面間で必要な磁気ギャップを形成する。外脚コア４８の長さＬｅは樹脂ボビン２０の高さＬｃよりも短く（即ち、Ｌｅ＜Ｌｃ）設定する。   The magnetic core is a combination of an upper core 44, a lower core 46, and a plurality of square rod-shaped outer leg cores 48. Both the upper core 44 and the lower core 46 are I-type cores (for example, flat plate cores). Here, the middle leg core 49 is fixed to the center of the lower core 46 so that the middle leg core 49 is inserted into the winding body portion 24 of the resin bobbin 20 and is necessary between the opposed surfaces of the upper core 44. A magnetic gap is formed. The length Le of the outer leg core 48 is set to be shorter than the height Lc of the resin bobbin 20 (that is, Le <Lc).

上コア４４を樹脂ボビン２０の上フランジ２６に、下コア４６を樹脂ボビン２０の下フランジ２８に、それぞれ接着する。そして、外脚コア４８を、上フランジ２６と下フランジ２８に接着する。外脚コア４８の長さが樹脂ボビン２０の高さよりも短いので、外周磁路では、上コア４４と外脚コア４８、外脚コア４８と下コア４６とは、少なくともいずれかが非衝合状態（隙間ｇがある状態）になる。このようにして得られたインダクタは、上コア４４と樹脂ボビン２０と下コア４６が密着して積み重ねられた状態となるため、インダクタとしての全体の高さが最小となる。   The upper core 44 is bonded to the upper flange 26 of the resin bobbin 20, and the lower core 46 is bonded to the lower flange 28 of the resin bobbin 20. Then, the outer leg core 48 is bonded to the upper flange 26 and the lower flange 28. Since the length of the outer leg core 48 is shorter than the height of the resin bobbin 20, at least one of the upper core 44 and the outer leg core 48 and the outer leg core 48 and the lower core 46 does not collide in the outer peripheral magnetic path. It becomes a state (a state with a gap g). In the inductor thus obtained, the upper core 44, the resin bobbin 20, and the lower core 46 are in close contact and stacked, so that the overall height of the inductor is minimized.

なお、この実施例では、上コア及び下コアを共にＩ型コアとし、別に中脚コアを用いているが、中脚コアと一体になった縦断面Ｔ型のフェライトコアを用いることもできる。つまり、Ｉ型コアとＴ型コアとの組み合わせ、あるいはＴ型コア同士の組み合わせとし、それらと外脚コアとにより磁気コアを構成してもよい。   In this embodiment, both the upper core and the lower core are I-type cores and a middle leg core is used separately. However, a ferrite core having a T-shaped longitudinal section integrated with the middle leg core can also be used. That is, a combination of an I-type core and a T-type core, or a combination of T-type cores may be used, and the magnetic core may be configured by the outer leg core.

図４は本発明に係る低背型インダクタの他の実施例を示す説明図である。ここで（Ａ）は組立前の縦断面を、（Ｂ）は組立後の縦断面を表している。巻線２２を施した樹脂ボビン２０に磁気コアを組み付けることで、インダクタを構成する。樹脂ボビン２０は、巻軸が実装面に対して垂直な向きとなる円筒型の巻胴部２４の上端に上フランジ２６が、下端に下フランジ２８が、それぞれ設けられており、フランジ径に対して巻軸方向長さが短い偏平構造である。   FIG. 4 is an explanatory view showing another embodiment of the low profile inductor according to the present invention. Here, (A) represents a longitudinal section before assembly, and (B) represents a longitudinal section after assembly. An inductor is configured by assembling a magnetic core to the resin bobbin 20 provided with the winding 22. The resin bobbin 20 is provided with an upper flange 26 at the upper end of a cylindrical winding body portion 24 whose winding axis is perpendicular to the mounting surface, and a lower flange 28 at the lower end. And a flat structure with a short length in the winding axis direction.

磁気コアは上コア５０と下コア５２の組み合わせである。上コア５０はＥ型コア（例えば、ＥＲコアやポットコアなど）であり、下コア５２はＩ型コア（例えば、平板コア）である。上コア５０の中脚部が樹脂ボビン２０の巻胴部２４内に挿入され、下コア５２との対向面間で必要な磁気ギャップが形成される。なお、この実施例では、上コア５０の外脚部の長さＬｆから下コア５２の高さＬｇを差し引いた長さが樹脂ボビン２０の高さＬｃにほぼ一致するように（即ち、Ｌｆ−Ｌｇ≒Ｌｃ）設定される。更に、上コア５０の外脚部内幅寸法Ｌｈは、下コア５２の長さＬｉよりも大きく（即ち、Ｌｈ＞Ｌｉ）設定され、下コア５２が上コア５０の両外脚部間に遊嵌し、それによって上コア５０の両外脚部の先端内側面と下コア５２の両先端面とは隙間が空いた状態になっている。   The magnetic core is a combination of the upper core 50 and the lower core 52. The upper core 50 is an E-type core (for example, an ER core or a pot core), and the lower core 52 is an I-type core (for example, a flat core). The middle leg portion of the upper core 50 is inserted into the winding drum portion 24 of the resin bobbin 20, and a necessary magnetic gap is formed between the opposed surfaces of the lower core 52. In this embodiment, the length obtained by subtracting the height Lg of the lower core 52 from the length Lf of the outer leg portion of the upper core 50 substantially matches the height Lc of the resin bobbin 20 (that is, Lf− Lg≈Lc) is set. Furthermore, the inner leg width Lh of the upper core 50 is set to be larger than the length Li of the lower core 52 (that is, Lh> Li), and the lower core 52 is loosely fitted between both outer legs of the upper core 50. As a result, there is a gap between the inner surfaces of the distal ends of the outer legs of the upper core 50 and the distal surfaces of the lower core 52.

上コア５０を樹脂ボビン２０の上フランジ２６に、下コア５２を樹脂ボビン２０の下フランジ２８に、それぞれ接着する。上コア５０の外脚部内幅寸法が下コア５２の長さよりも大きいので、外周磁路では上コア５０と下コア５２とは互いに非接合状態（隙間がある状態）になる。磁気コアの寸法公差は上コア５０と下コア５２との隙間で吸収でき、周囲温度変動に伴う樹脂ボビンの寸法変化は上コアと下コアとが相対的に変位可能なことで吸収される。このようにして得られたインダクタは、上コアと樹脂ボビンと下コアが密着して積み重ねられた状態となるため、インダクタとしての全体の高さが最小となる。   The upper core 50 is bonded to the upper flange 26 of the resin bobbin 20, and the lower core 52 is bonded to the lower flange 28 of the resin bobbin 20. Since the inner leg width dimension of the upper core 50 is larger than the length of the lower core 52, the upper core 50 and the lower core 52 are not joined to each other (there is a gap) in the outer peripheral magnetic path. The dimensional tolerance of the magnetic core can be absorbed by the gap between the upper core 50 and the lower core 52, and the dimensional change of the resin bobbin accompanying the ambient temperature fluctuation is absorbed by the relative displacement of the upper core and the lower core. In the inductor thus obtained, the upper core, the resin bobbin, and the lower core are in close contact and stacked, so that the overall height of the inductor is minimized.

２０ 樹脂ボビン
２２ 巻線
２４ 巻胴部
２６ 上フランジ
２８ 下フランジ
３０ 上コア
３２ 下コア
３４ 取付ベース
３６ 端子 20 Resin bobbin 22 Winding 24 Winding body part 26 Upper flange 28 Lower flange 30 Upper core 32 Lower core 34 Mounting base 36 Terminal

Claims (5)

筒型の巻胴部の両端にフランジを備えた樹脂ボビンに、巻線を施し、該樹脂ボビンに磁気コアを組み付け、該磁気コアによって、樹脂ボビンの巻胴部内に必要な磁気ギャップを設けた中央磁路を、樹脂ボビンの外側に外周磁路を、それぞれ形成するインダクタにおいて、
前記磁気コアは、少なくとも上コアと下コアを有し、樹脂ボビンは、その巻軸が実装面に対して垂直となる向きとして、上コアを樹脂ボビンの上フランジに、下コアを樹脂ボビンの下フランジに、それぞれ密着し、コア同士は外周磁路で互いに非衝合状態になっていることを特徴とする低背型インダクタ。 Winding is applied to a resin bobbin having flanges at both ends of a cylindrical winding body, and a magnetic core is assembled to the resin bobbin, and the magnetic core provides a necessary magnetic gap in the winding body of the resin bobbin. In the inductor that forms the central magnetic path and the outer peripheral magnetic path outside the resin bobbin,
The magnetic core has at least an upper core and a lower core, and the resin bobbin is oriented so that its winding axis is perpendicular to the mounting surface, the upper core is the upper flange of the resin bobbin, and the lower core is the resin bobbin A low-profile inductor characterized in that each core is in close contact with the lower flange, and the cores are in a non-abutting state with an outer peripheral magnetic path. 上コアと下コアが共に縦断面Ｅ型であって、上コアと下コアの中脚部が樹脂ボビンの巻胴部内に挿入され、それらの対向面間で必要な磁気ギャップを設け、上コアと下コアの外脚部は、それらの長さの合計が樹脂ボビンの高さよりも短く設定され、それによって上コアと下コアとの対向面が非衝合状態になっている請求項１記載の低背型インダクタ。   Both the upper core and the lower core have an E-shaped longitudinal section, and the middle leg portion of the upper core and the lower core is inserted into the winding body portion of the resin bobbin, and a necessary magnetic gap is provided between the facing surfaces of the upper core and the upper core. The outer leg portions of the upper core and the lower core are set such that the total length thereof is shorter than the height of the resin bobbin, whereby the opposing surfaces of the upper core and the lower core are in a non-abutting state. Low profile inductor. 上コアと下コアは、一方が縦断面Ｅ型、他方が縦断面Ｉ型であって、Ｅ型コアの中脚部が樹脂ボビンの巻胴部内に挿入され、前記中脚部の先端面とＩ型コアとの間で必要な磁気ギャップを設け、Ｅ型コアの外脚部は、その長さが樹脂ボビンの高さよりも短く設定され、それによってＥ型コアの両外脚部の先端面とＩ型コアとは非衝合状態になっている請求項１記載の低背型インダクタ。   One of the upper core and the lower core has a vertical cross section E type, and the other has a vertical cross section I type, and the middle leg portion of the E type core is inserted into the winding body portion of the resin bobbin, A necessary magnetic gap is provided between the I-type core and the length of the outer leg portion of the E-type core is set to be shorter than the height of the resin bobbin. 2. The low profile inductor according to claim 1, wherein the I-type core and the I-type core are in a non-abutting state. 上コアと下コアは共に無外脚の形状であって、それらとは別の外脚コアを樹脂ボビンの外側に取り付け、該外脚コアは、その長さが樹脂ボビンの高さよりも短く設定され、それによって外周磁路を形成する上コアと外脚コア、外脚コアと下コアとが、いずれも非衝合状態になっている請求項１記載の低背型インダクタ。   Both the upper core and the lower core are shaped as outer legs, and another outer leg core is attached to the outside of the resin bobbin, and the length of the outer leg core is set shorter than the height of the resin bobbin. 2. The low profile inductor according to claim 1, wherein the upper core and the outer leg core, and the outer leg core and the lower core forming the outer peripheral magnetic path are in a non-abutting state. 上コアと下コアは、一方が縦断面Ｅ型、他方が縦断面Ｉ型であって、Ｅ型コアの中脚部が樹脂ボビンの筒型巻胴部内に挿入され、前記中脚部の先端面とＩ型コアとの間で必要な磁気ギャップを設け、Ｅ型コアの外脚部内幅寸法をＩ型コアの長さよりも大きく設定し、Ｉ型コアがＥ型コアの外脚部間に遊嵌し、それによってＥ型コアの両外脚部の先端内側面とＩ型コアの両先端面とが非衝合状態になっている請求項１記載の低背型インダクタ。   One of the upper core and the lower core has a vertical cross section E type, and the other has a vertical cross section I type, and the middle leg portion of the E type core is inserted into the cylindrical body of the resin bobbin. A necessary magnetic gap is provided between the surface and the I-type core, the inner leg width of the E-type core is set larger than the length of the I-type core, and the I-type core is located between the outer legs of the E-type core. 2. The low profile inductor according to claim 1, wherein the inner surface of the distal ends of both outer legs of the E-type core and the both end surfaces of the I-type core are in a non-abutting state.
JP2009053340A 2009-03-06 2009-03-06 Low-profile inductor Pending JP2010212271A (en)

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