JPH09306754A - Choke coil - Google Patents
Choke coilInfo
- Publication number
- JPH09306754A JPH09306754A JP14356796A JP14356796A JPH09306754A JP H09306754 A JPH09306754 A JP H09306754A JP 14356796 A JP14356796 A JP 14356796A JP 14356796 A JP14356796 A JP 14356796A JP H09306754 A JPH09306754 A JP H09306754A
- Authority
- JP
- Japan
- Prior art keywords
- center
- leg
- core
- legs
- inductance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Coils Or Transformers For Communication (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、整流回路やスイッ
チングレギュレータなどの電気的なフィルタとして使用
されるチョークコイルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a choke coil used as an electric filter such as a rectifier circuit and a switching regulator.
【０００２】[0002]
【従来の技術】従来、チョークコイルは、例えば図５に
示すように、環状の磁気回路Ａの途中の中心部から外れ
た片側に断面積が小さくなるようにギャップＧを形成
し、磁気回路Ａに巻回したコイルＣの負荷電流が小さ
く、ギャップを設けた部分の磁気回路が飽和しない状態
ではインダクタンスが大きく、負荷電流が大きくなり、
ギャップを設けた部分の磁気回路が飽和した状態ではイ
ンダクタンスが小さくなるようにしたものが開示されて
いる（例えば、特開昭６２−１６５３１０号公報）。ま
た、例えば図６に示すように、Ｅ型コアとＩ型コアを突
き合わせて磁気回路Ａを形成し、Ｅ型コアとＩ型コアの
間に、Ｅ型コアとＩ型コアよりも透磁率の高い軟磁性体
材Ｂをはさみ込むとともに、Ｅ型コアの中央脚Ａ1 にコ
イルＣを巻付け、コイルに流す電流が小さいうちはイン
ダクタンスが大きくなるようにし、電流が大きくなると
インダクタンスが小さくなるようにしたものが開示され
ている（例えば、特開昭６３−２２８６０５号公報）。2. Description of the Related Art Conventionally, as shown in FIG. 5, for example, a choke coil has a gap G formed on one side of a ring-shaped magnetic circuit A deviating from the central portion so as to have a small cross-sectional area. When the load current of the coil C wound around is small and the magnetic circuit in the portion where the gap is provided is not saturated, the inductance is large and the load current is large,
Japanese Patent Application Laid-Open No. 62-165310 discloses a device in which the inductance is reduced when the magnetic circuit in the portion where the gap is provided is saturated. Further, as shown in FIG. 6, for example, an E-type core and an I-type core are butted to form a magnetic circuit A, and a magnetic circuit having a higher magnetic permeability than the E-type core and the I-type core is formed between the E-type core and the I-type core. While sandwiching the high soft magnetic material B, the coil C is wound around the central leg A 1 of the E-shaped core so that the inductance increases while the current flowing through the coil is small, and the inductance decreases when the current increases. Japanese Patent Laid-Open No. 63-228605 has been disclosed.
【０００３】[0003]
【発明が解決しようとする課題】ところが、上記前者の
従来技術では、磁気回路の中心部から外れた片側にギャ
ップを設けてあるため、磁束の片よりが生じ、磁気特性
が不安定になるという問題があった。また、上記後者の
従来技術では、Ｅ型コアとＩ型コアの間に、軟磁性体材
をはさみ込んでいるが、軟磁性体材に直流磁界が印加さ
れると磁石になる偏磁を生じ、電流が小さいうちに磁束
が早く飽和するので、インダクタンスはほとんど変化し
ない時と同じになってしまうという問題があった。本発
明は、磁気特性が安定し、負荷電流の変化に応じてイン
ダクタンスを変えることができる構造が簡単なチョーク
コイルを提供することを目的とするものである。However, in the former prior art described above, since a gap is provided on one side of the magnetic circuit, which is deviated from the central portion of the magnetic circuit, a magnetic flux is generated and the magnetic characteristics become unstable. There was a problem. Further, in the latter prior art, the soft magnetic material is sandwiched between the E-shaped core and the I-shaped core. However, when a DC magnetic field is applied to the soft magnetic material, demagnetization which becomes a magnet occurs. However, since the magnetic flux saturates quickly while the current is small, there is a problem that the inductance becomes the same as when it hardly changes. It is an object of the present invention to provide a choke coil having a stable magnetic characteristic and a simple structure capable of changing the inductance according to a change in load current.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するた
め、本発明は、互いに対向する二つの基部と、前記基部
の両端を結ぶ端部脚と、前記二つの基部を中央で結ぶ中
央脚とを設けた強磁性体からなるコアと、前記中央脚に
巻回したコイルとを備えたチョークコイルにおいて、前
記中央脚に前記中央脚より小さい断面積を有し、前記コ
アと同一材料からなる狭隘部を設けたものである。In order to solve the above-mentioned problems, the present invention provides two bases facing each other, end legs connecting both ends of the base, and a central leg connecting the two bases at the center. In a choke coil including a core made of a ferromagnetic material and a coil wound around the central leg, the narrow leg made of the same material as the core has a cross-sectional area smaller than that of the central leg. Parts are provided.
【０００５】[0005]
【発明の実施の形態】以下、本発明を図に示す実施例に
ついて説明する。図１は本発明の実施例を示す（ａ）正
面図および（ｂ）側面図である。図において、１はコア
で、２個のＥ形コア２の基部３の両端に形成された端部
脚３ａ，３ｂおよび中央部に形成された中央脚３ｃを突
き合わせて形成し、中央脚３ｃと基部３と端部脚３ａを
通る一方の磁気回路と、中央脚３ｃと基部３と端部脚３
ｂを通る他方の磁気回路を形成してある。二つの中央脚
３ｃの先端には中央脚３ｃより断面積が小さくなるよう
に絞った突起部４を設けてある。したがって、二つのＥ
形コア２を突き合わせたときに、中央脚３ｃの中央には
二つの突起部４によって狭隘部５が形成されている。６
は中央脚３ｃの回りに巻回されたコイルである。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to embodiments shown in the drawings. FIGS. 1A and 1B are a front view and a side view showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a core, which is formed by abutting end legs 3a and 3b formed at both ends of a base 3 of two E-shaped cores 2 and a central leg 3c formed at a central portion, One magnetic circuit passing through the base 3 and the end leg 3a, the central leg 3c, the base 3 and the end leg 3
The other magnetic circuit passing through b is formed. At the tips of the two central legs 3c, there are provided protrusions 4 that are narrowed so that their cross-sectional areas are smaller than those of the central legs 3c. Therefore, two E
When the shaped cores 2 are butted, a narrow portion 5 is formed by the two protrusions 4 in the center of the central leg 3c. 6
Is a coil wound around the central leg 3c.
【０００６】このような構成で、コイル５に流れる負過
電流が小さいときは、負荷電流によって誘起される磁束
Φ1 は、コア１の端部脚３ａ，３ｂおよび中央脚３ｃを
流れるが、中央脚３ｃに流れる磁束Φ1 は、図２（ａ）
に示すように、全て狭隘部５を通過し、チョークコイル
としてのインダクタンスＬ1 は、図３に示すように、大
きい値になる。負荷電流が大きくなると、磁束は大きく
なり、図２（ｂ）に示すように、狭隘部５は磁気飽和を
起こし、中央脚３ｃに流れる磁束Φ2 は狭隘部５を通過
しない磁束が発生し、図３に示すように、チョークコイ
ルとしてのインダクタンスＬ2は小さくなる。このよう
に、中央脚３ｃに磁気飽和が生じる狭隘部５を設けてあ
るので、負荷電流が小さい時はインダクタンスを大きく
し、負荷電流が大きい時は磁気飽和を発生させてインダ
クタンスを小さくなる二重特性を持たせることができ
る。このとき、磁気飽和が発生しても、外部に漏れるこ
とがなく、また磁束の片よりが生じるともなく、磁気特
性が安定する。また、狭隘部５は強磁性体であるコアと
同じ材質であるので、偏磁が生じることもなく、負荷電
流の変化に応じてインダクタンスを変えることができ
る。なお、コア１の狭隘部５は、図４に示すように、中
央脚３ｃの先端に複数の歯４１からなる突起部４を持っ
たＥ形コア２を積層して形成してもよい。また、上記実
施例ではＥ形コアを二つ突き合わせてコアを形成した例
について説明したが、Ｅ形コアとＩ形コアを組み合わ
せ、中央脚とＩ形コアの間に狭隘部を形成し、中央脚の
両側に二つの磁気回路を形成してもよい。With such a structure, when the negative overcurrent flowing through the coil 5 is small, the magnetic flux Φ 1 induced by the load current flows through the end legs 3a and 3b of the core 1 and the central leg 3c, but at the center. The magnetic flux Φ 1 flowing in the leg 3c is as shown in FIG.
As shown in FIG. 3, all pass through the narrow portion 5, and the inductance L 1 as a choke coil has a large value as shown in FIG. When the load current increases, the magnetic flux increases, and as shown in FIG. 2B, the narrow portion 5 causes magnetic saturation, and the magnetic flux Φ 2 flowing through the central leg 3c generates a magnetic flux that does not pass through the narrow portion 5, As shown in FIG. 3, the inductance L 2 as a choke coil becomes small. In this way, since the narrow portion 5 where magnetic saturation occurs is provided in the central leg 3c, the inductance is increased when the load current is small, and magnetic saturation is generated when the load current is large to reduce the inductance. It can have characteristics. At this time, even if magnetic saturation occurs, there is no leakage to the outside and no magnetic flux is generated, and the magnetic characteristics are stable. Further, since the narrow portion 5 is made of the same material as that of the core which is a ferromagnetic material, it is possible to change the inductance according to the change of the load current without causing the demagnetization. Note that the narrow portion 5 of the core 1 may be formed by stacking the E-shaped core 2 having the protruding portion 4 including the plurality of teeth 41 at the tip of the central leg 3c, as shown in FIG. Further, in the above embodiment, an example in which two E-shaped cores are butted against each other to form a core has been described. However, the E-shaped core and the I-shaped core are combined to form a narrow portion between the central leg and the I-shaped core, and the central portion is formed. Two magnetic circuits may be formed on both sides of the leg.
【０００７】[0007]
【発明の効果】以上述べたように、本発明によれば、コ
アの中央脚に磁気飽和が生じる狭隘部を設けてあるの
で、一つのチョークコイルで偏磁が生じることもなく、
安定して負荷電流の変化に応じてインダクタンスを変え
ることができるチョークコイルを提供できる効果があ
る。As described above, according to the present invention, the central leg of the core is provided with the narrow portion where magnetic saturation occurs, so that there is no demagnetization in one choke coil.
There is an effect that it is possible to provide a choke coil that can stably change the inductance according to changes in the load current.
【図１】 本発明の実施例を示す（ａ）正面図および
（ｂ）側面図である。FIG. 1A is a front view and FIG. 1B is a side view showing an embodiment of the present invention.
【図２】 本発明の実施例の中央脚を磁束が通過する状
態を示す説明図である。FIG. 2 is an explanatory diagram showing a state in which magnetic flux passes through the central leg of the embodiment of the present invention.
【図３】 本発明の実施例の負荷電流とインダクタンス
の関係を示すグラフである。FIG. 3 is a graph showing the relationship between the load current and the inductance in the example of the present invention.
【図４】 本発明の他の実施例を示す正面図であるFIG. 4 is a front view showing another embodiment of the present invention.
【図５】 従来例を示す正面図であるFIG. 5 is a front view showing a conventional example.
【図６】 他の従来例を示す正面図であるFIG. 6 is a front view showing another conventional example.
１：コア、２：Ｅ形コア、３：基部、３ａ，３ｂ：端部
脚、３ｃ：中央脚、４：突起部、４１：歯、５：狭隘
部、６：コイル1: core, 2: E-shaped core, 3: base part, 3a, 3b: end leg, 3c: central leg, 4: protrusion part, 41: tooth, 5: narrow part, 6: coil
Claims (1)
の両端を結ぶ端部脚と、前記二つの基部を中央で結ぶ中
央脚とを設けた強磁性体からなるコアと、前記中央脚に
巻回したコイルとを備えたチョークコイルにおいて、前
記中央脚に前記中央脚より小さい断面積を有し、前記コ
アと同一材料からなる狭隘部を設けたことを特徴とする
チョークコイル。1. A core made of a ferromagnetic material having two bases facing each other, an end leg connecting both ends of the base, and a central leg connecting the two bases at the center, and a center leg. A choke coil comprising a wound coil, wherein the central leg has a cross-sectional area smaller than that of the central leg, and a narrow portion made of the same material as the core is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14356796A JPH09306754A (en) | 1996-05-13 | 1996-05-13 | Choke coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14356796A JPH09306754A (en) | 1996-05-13 | 1996-05-13 | Choke coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09306754A true JPH09306754A (en) | 1997-11-28 |
Family
ID=15341763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14356796A Pending JPH09306754A (en) | 1996-05-13 | 1996-05-13 | Choke coil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09306754A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011176253A (en) * | 2010-01-28 | 2011-09-08 | Toyota Industries Corp | Induction apparatus |
| JP2011211102A (en) * | 2010-03-30 | 2011-10-20 | Toyota Industries Corp | Reactor |
| US8159323B2 (en) | 2007-09-19 | 2012-04-17 | Panasonic Corporation | Transformer and power supply apparatus using the same |
-
1996
- 1996-05-13 JP JP14356796A patent/JPH09306754A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8159323B2 (en) | 2007-09-19 | 2012-04-17 | Panasonic Corporation | Transformer and power supply apparatus using the same |
| JP4930596B2 (en) * | 2007-09-19 | 2012-05-16 | パナソニック株式会社 | Transformer and power supply using the same |
| JP2011176253A (en) * | 2010-01-28 | 2011-09-08 | Toyota Industries Corp | Induction apparatus |
| JP2011211102A (en) * | 2010-03-30 | 2011-10-20 | Toyota Industries Corp | Reactor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Effective date: 20051017 Free format text: JAPANESE INTERMEDIATE CODE: A971007 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20051026 |
|
| A02 | Decision of refusal |
Effective date: 20060301 Free format text: JAPANESE INTERMEDIATE CODE: A02 |