JP2007129125A

JP2007129125A - Transformer

Info

Publication number: JP2007129125A
Application number: JP2005321955A
Authority: JP
Inventors: Yoshihiro Kuniya; 佳弘国谷; Sadao Morimoto; 貞雄森元; Katsumi Matsumura; 勝己松村; Akiyuki Komatsu; 明幸小松
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2005-11-07
Filing date: 2005-11-07
Publication date: 2007-05-24
Anticipated expiration: 2025-11-07
Also published as: JP4747789B2

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the negative effect of a transformer generating leakage flux on another mounted component. <P>SOLUTION: A transformer to be provided includes an E-shaped core 4 having two outer legs 4A and 4B and one inner leg 4C, an E-shaped core 5 having two outer legs 5A and 5B and one inner leg 5C, and coils 6A and 6B each of which is wound on the E-shaped core 4 or the E-shaped core 5. The outer legs 5A and 5B of the E-shaped core 5 are made to be thicker than the outer legs 4A and 4B of the E-shaped core 4, and the inner leg 4C of the E-shaped core 4 is made to be thicker than the inner leg 5C of the E-shaped core 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、ディスプレイ装置等の各種電子機器に用いられるトランスに関するものである。 The present invention relates to a transformer used in various electronic devices such as a display device.

従来この種のトランスは、図７に示されるように、脚１Ａ、１Ｂ、１Ｃを有するＥ字コア１と、脚２Ａ、２Ｂ、２Ｃを有するＥ字コア２と、Ｅ字コア１、Ｅ字コア２に巻回したコイル３Ａ、３Ｂとを備え、Ｅ字コア２の有する脚２Ａ、２Ｂ、２ＣをＥ字コア１の有する脚１Ａ、１Ｂ、１Ｃよりも細い構成とすることにより、漏磁束を積極的に発生させることで、ディスプレイ装置用の電気回路等に用いる漏磁束トランスとして利用されていた。 Conventionally, as shown in FIG. 7, this type of transformer includes an E-shaped core 1 having legs 1A, 1B and 1C, an E-shaped core 2 having legs 2A, 2B and 2C, and an E-shaped core 1 and E-shaped. Magnetic flux leakage by including coils 3A, 3B wound around the core 2 and having the legs 2A, 2B, 2C of the E-shaped core 2 thinner than the legs 1A, 1B, 1C of the E-shaped core 1 Has been used as a magnetic flux transformer for use in electric circuits for display devices.

なお、この出願に関する先行技術文献情報としては、例えば、特許文献１が知られている。
特開平８−２８８１５９号公報 As prior art document information relating to this application, for example, Patent Document 1 is known.
JP-A-8-288159

このような従来のトランスは他の実装部品等に悪影響をもたらすことが問題となっていた。 Such a conventional transformer has a problem in that it adversely affects other mounted components.

すなわち、上記従来の構成においては、Ｅ字コア２の脚２Ａ、２Ｂ、２Ｃを細くすることによって、磁気抵抗を増やし、磁束を外へ締め出すようにして漏磁束を発生させていたため、図８に示すごとく、Ｅ字コア２のそれぞれの脚２Ａ、２Ｂ、２Ｃから放射状に漏磁束１３が発生してしまう。そのため、この漏磁束１３が他の部品を通過することに起因して、例えばその端子部分に過電流が発生するなどの悪影響をもたらしていた。 That is, in the above-described conventional configuration, the leakage flux is generated by increasing the magnetic resistance by narrowing the legs 2A, 2B, and 2C of the E-shaped core 2 so that the magnetic flux is shut out. As shown, the leakage flux 13 is generated radially from the legs 2A, 2B, 2C of the E-shaped core 2. For this reason, the leakage magnetic flux 13 passes through other components, resulting in adverse effects such as the occurrence of overcurrent at the terminal portion.

そこで本発明は、漏磁束を発生させるトランスにおいて、他の実装部品への悪影響を低減することを目的とする。 Therefore, an object of the present invention is to reduce adverse effects on other mounted parts in a transformer that generates a magnetic flux leakage.

そして、この目的を達成するために本発明は、第２のＥ字コアの外脚を前記第１のＥ字コアの外脚よりも太く、前記第１のＥ字コアの内脚を前記第２のＥ字コアの内脚よりも太くしたものである。 In order to achieve this object, according to the present invention, the outer leg of the second E-shaped core is thicker than the outer leg of the first E-shaped core, and the inner leg of the first E-shaped core is It is thicker than the inner leg of No. 2 E-core.

本発明のトランスは、意識的に太くした第２のＥ字コアの外脚と意識的に太くした第１のＥ字コアの内脚との間において、局所的に漏磁束を発生させるため、放射状の漏磁束の発生量を増やすことがなく、他の実装部品への悪影響を低減することができる。 The transformer of the present invention generates a magnetic flux leakage locally between the outer leg of the second E-shaped core that is consciously thickened and the inner leg of the first E-shaped core that is consciously thickened. Without increasing the amount of radial magnetic flux leakage, adverse effects on other mounted components can be reduced.

（実施の形態１）
以下、本発明の実施の形態１におけるトランスについて図面を参照しながら説明する。 (Embodiment 1)
Hereinafter, the transformer according to the first embodiment of the present invention will be described with reference to the drawings.

図１において、二つのＥ字コア４、５はそれぞれ外脚４Ａ、４Ｂ、外脚５Ａ、５Ｂを背脚４Ｄ、背脚５Ｄの両端部分に有しており、背脚４Ｄ、背脚５Ｄの略中央部分にはそれぞれ、内脚４Ｃ、内脚５Ｃを有している。そして、この二つのＥ字コア４、５を対向する位置に配置している。 In FIG. 1, two E-shaped cores 4 and 5 have outer legs 4A and 4B and outer legs 5A and 5B, respectively, at both ends of the back leg 4D and the back leg 5D. Each substantially central portion has an inner leg 4C and an inner leg 5C. And these two E-shaped cores 4 and 5 are arrange | positioned in the position which opposes.

そして、Ｅ字コア４の内脚４Ｃの太さをＥ字コア５の内脚５Ｃの太さよりも太くし、Ｅ字コア５の外脚５Ａ、５ＢをそれぞれＥ字コア４の外脚４Ａ、４Ｂよりも太くしている。 Then, the thickness of the inner leg 4C of the E-shaped core 4 is made thicker than the thickness of the inner leg 5C of the E-shaped core 5, and the outer legs 5A, 5B of the E-shaped core 5 are respectively connected to the outer legs 4A of the E-shaped core 4. It is thicker than 4B.

そして、Ｅ字コア４の内脚４Ａには一次コイル６Ａを、Ｅ字コア５の内脚５Ａには二次コイル６Ｂを巻回している。 A primary coil 6A is wound around the inner leg 4A of the E-shaped core 4, and a secondary coil 6B is wound around the inner leg 5A of the E-shaped core 5.

このような構成にしたため、磁束は図２に示すような流れになる。即ち、Ｅ字コア４の内脚４Ｃに巻回した一次コイル６Ａに電流が流れると、磁束７Ａが発生し、この磁束７ＡがＥ字コア５の内脚５Ｃを通ることにより、この内脚５Ｃに巻回された二次コイル６Ｂに電流が流れる。そして、Ｅ字コア４の内脚４Ｃと、Ｅ字コア５の外脚５Ａ、５Ｂとを、意識的に太くすることで接近させ、内脚４Ｃと外脚５Ａ、５Ｂとの間において漏磁束７Ｂを局所的に発生させることができる。 Due to such a configuration, the magnetic flux flows as shown in FIG. That is, when a current flows through the primary coil 6A wound around the inner leg 4C of the E-shaped core 4, a magnetic flux 7A is generated, and this magnetic flux 7A passes through the inner leg 5C of the E-shaped core 5, thereby causing the inner leg 5C. A current flows through the secondary coil 6B wound around. Then, the inner leg 4C of the E-shaped core 4 and the outer legs 5A, 5B of the E-shaped core 5 are brought close to each other by consciously thickening, and the magnetic flux leakage between the inner leg 4C and the outer legs 5A, 5B. 7B can be generated locally.

このように、放射状の漏磁束（図示せず）を大量に発生させることなく、漏磁束７Ｂを局所的に発生させることにより、ランプを用いるディスプレイ装置等の電源回路において有効に利用することができ、且つ他の実装部品に対する悪影響を低減することができる。 Thus, by generating the magnetic flux 7B locally without generating a large amount of radial magnetic flux (not shown), it can be used effectively in a power supply circuit such as a display device using a lamp. In addition, adverse effects on other mounted components can be reduced.

なお、一次コイル６Ａ及び二次コイル６Ｂは、本願構成と異なる部分に巻回しても構わないが、最も大きな磁束７Ａの流れが発生する一次コイル６Ａ巻回部分は、意識的に太くしたＥ字コア４の内脚４Ｃとすることが望ましい。 The primary coil 6A and the secondary coil 6B may be wound around different parts from the configuration of the present application, but the primary coil 6A winding part where the flow of the largest magnetic flux 7A is generated is consciously thickened E-shaped. The inner leg 4C of the core 4 is desirable.

さらに、Ｅ字コア４の内脚４Ｃの長さ及びＥ字コア５の内脚５Ｃの長さを可変することにより、漏磁束７Ｂの量を可変することができる。例えば、図３に示すように、Ｅ字コア４の内脚４Ｃを長くし、Ｅ字コア５の内脚５Ｃをその分短くすることで、意識的に太くしたＥ字コア４の内脚４Ｃと、意識的に太くしたＥ字コア５の外脚５Ａ、５Ｂとの対向する面積が増えることにより、図４に示すごとく漏磁束７Ｂの発生量を大きくすることができる。逆に、Ｅ字コア４の内脚４Ｃを短くし、Ｅ字コア５の内脚５Ｃをその分長くすることで、内脚４Ｃと外脚５Ａ、５Ｂとの対向する面積を減少させることにより、漏磁束７Ｂの発生量を小さくすることができる。 Further, by changing the length of the inner leg 4C of the E-shaped core 4 and the length of the inner leg 5C of the E-shaped core 5, the amount of the magnetic flux 7B can be varied. For example, as shown in FIG. 3, the inner leg 4C of the E-shaped core 4 is consciously thickened by lengthening the inner leg 4C of the E-shaped core 4 and shortening the inner leg 5C of the E-shaped core 5 accordingly. Then, by increasing the area of the E-core 5 that is consciously thickened and facing the outer legs 5A and 5B, the amount of leakage flux 7B can be increased as shown in FIG. Conversely, by shortening the inner leg 4C of the E-shaped core 4 and increasing the length of the inner leg 5C of the E-shaped core 5 by that amount, the opposing area between the inner leg 4C and the outer legs 5A, 5B is reduced. The amount of magnetic flux 7B generated can be reduced.

（実施の形態２）
以下、本発明の実施の形態２におけるトランスについて図面を参照しながら説明する。 (Embodiment 2)
Hereinafter, the transformer according to the second embodiment of the present invention will be described with reference to the drawings.

図５において、二つのＵ字コア８、９は、それぞれ脚８Ａ、８Ｂ、脚９Ａ、９Ｂを背脚８Ｃ、背脚９Ｃの両端部分に有しており、互いに対向する位置に配置されている。 In FIG. 5, two U-shaped cores 8 and 9 have legs 8A and 8B and legs 9A and 9B at the opposite ends of the back leg 8C and the back leg 9C, respectively, and are arranged at positions facing each other. .

そして、Ｕ字コア８の脚８Ｂの太さをＵ字コア９の脚９Ｂの太さよりも太くし、Ｕ字コア９の脚９ＡをＵ字コア８の脚８Ａよりも太くしている。 The leg 8B of the U-shaped core 8 is thicker than the leg 9B of the U-shaped core 9, and the leg 9A of the U-shaped core 9 is thicker than the legs 8A of the U-shaped core 8.

そして、Ｕ字コア８の脚８Ｂには一次コイル１０Ａを、Ｕ字コア９の背脚９Ｃには二次コイル１０Ｂを巻回している。 The primary coil 10A is wound around the leg 8B of the U-shaped core 8, and the secondary coil 10B is wound around the back leg 9C of the U-shaped core 9.

このような構成にしたため、磁束は図６に示すような流れになる。即ち、Ｕ字コア８の背脚８Ｃに巻回した一次コイル１０Ａに電流が流れると、磁束１１Ａが発生し、この磁束１１ＡがＵ字コア９の背脚９Ｃを通ることにより、この背脚９Ｃに巻回された二次コイル１０Ｂに電流が流れる。そして、Ｕ字コア８の脚８Ｂと、Ｕ字コア９の脚９Ａとを、意識的に太くすることで接近させ、脚８Ｂ、脚９Ａ間において、漏磁束１１Ｂを局所的に発生させることができる。 Due to such a configuration, the magnetic flux flows as shown in FIG. That is, when a current flows through the primary coil 10A wound around the back leg 8C of the U-shaped core 8, a magnetic flux 11A is generated, and this magnetic flux 11A passes through the back leg 9C of the U-shaped core 9 so that the back leg 9C. A current flows through the secondary coil 10B wound around. Then, the leg 8B of the U-shaped core 8 and the leg 9A of the U-shaped core 9 are brought close to each other by consciously thickening, and a leakage magnetic flux 11B is locally generated between the legs 8B and 9A. it can.

このように、放射状の漏磁束（図示せず）を大量に発生させることなく、漏磁束１１Ｂを局所的に発生させることにより、ランプを用いるディスプレイ装置等の電源回路において有効に利用することができ、且つ他の実装部品に対する悪影響を低減することができる。 Thus, by generating the magnetic flux leakage 11B locally without generating a large amount of radial magnetic flux leakage (not shown), it can be effectively used in a power supply circuit such as a display device using a lamp. In addition, adverse effects on other mounted components can be reduced.

なお、一次コイル１０Ａ及び二次コイル１０Ｂは、本願構成と異なる部分に巻回しても構わないが、最も大きな磁束の流れが発生する一次コイル１０Ａ巻回部分は、意識的に太くしたＵ字コア８の脚８Ｂとすることが望ましい。 The primary coil 10A and the secondary coil 10B may be wound around different parts from the configuration of the present application, but the primary coil 10A winding part where the largest magnetic flux flow is generated is a U-shaped core consciously thickened. Eight legs 8B are desirable.

本発明のトランスは、他の実装部品への悪影響を低減することができるという効果を有し、漏磁束を積極的に利用するディスプレイ装置等の電源回路などにおいて有用である。 The transformer of the present invention has an effect that adverse effects on other mounted components can be reduced, and is useful in a power supply circuit such as a display device that actively uses leakage flux.

本発明の実施の形態１におけるトランスの上面図Top view of transformer in embodiment 1 of the present invention 本発明の実施の形態１におけるトランスの斜視図The perspective view of the trans | transformer in Embodiment 1 of this invention 本発明の実施の形態１の変形例のトランスの上面図Top view of a transformer according to a modification of the first embodiment of the present invention 本発明の実施の形態１の変形例のトランスの斜視図The perspective view of the transformer of the modification of Embodiment 1 of this invention 本発明の実施の形態２の変形例のトランスの上面図The top view of the transformer of the modification of Embodiment 2 of this invention 本発明の実施の形態２の変形例のトランスの斜視図The perspective view of the transformer of the modification of Embodiment 2 of this invention 従来のトランスの上面図Top view of conventional transformer 従来のトランスの斜視図A perspective view of a conventional transformer

Explanation of symbols

４Ｅ字コア
４Ａ外脚
４Ｂ外脚
４Ｃ内脚
５Ｅ字コア
５Ａ外脚
５Ｂ外脚
５Ｃ内脚
６Ａ一次コイル（コイル）
６Ｂ二次コイル（コイル） 4 E-shaped core 4A Outer leg 4B Outer leg 4C Inner leg 5 E-shaped core 5A Outer leg 5B Outer leg 5C Inner leg 6A Primary coil (coil)
6B Secondary coil (coil)

Claims

A first E-shaped core having two outer legs and one inner leg, and having two outer legs and one inner leg, and disposed opposite to the first E-shaped core. A second E-shaped core and a coil wound around at least one of the first E-shaped core or the second E-shaped core, and an outer leg of the second E-shaped core is the first E-shaped core. A transformer in which the outer legs of the first E-shaped core are thicker than the outer legs of the first E-shaped core, and the inner legs of the first E-shaped core are thicker than the inner legs of the second E-shaped core.

The inner leg of the first E-shaped core is longer than the outer leg of the first E-shaped core, and the inner leg of the second E-shaped core is shorter than the outer leg of the second E-shaped core. The transformer according to 1.

The inner leg of the first E-shaped core is shorter than the outer leg of the first E-shaped core, and the inner leg of the second E-shaped core is longer than the outer leg of the second E-shaped core. The transformer according to 1.

A first U-core having a first leg and a second leg; a second U-core having a first leg and a second leg and disposed opposite to the first U-core; A U-core, and a coil wound around at least one of the first U-core or the second U-core, and the first leg of the second U-core is the first leg A transformer that is thicker than the first leg of the U-shaped core, and the second leg of the first U-shaped core is thicker than the second leg of the second U-shaped core.

The second leg of the first U-shaped core is longer than the first leg of the first U-shaped core, and the second leg of the second U-shaped core is the first of the second U-shaped core. The transformer according to claim 4, wherein the transformer is shorter than the leg of the base.

The second leg of the first U-shaped core is shorter than the first leg of the first U-shaped core, and the second leg of the second U-shaped core is the first of the second U-shaped core. The transformer according to claim 1, wherein the transformer is longer than the leg.