JP2008218754A - Transformer - Google Patents

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Publication number
JP2008218754A
JP2008218754A JP2007054783A JP2007054783A JP2008218754A JP 2008218754 A JP2008218754 A JP 2008218754A JP 2007054783 A JP2007054783 A JP 2007054783A JP 2007054783 A JP2007054783 A JP 2007054783A JP 2008218754 A JP2008218754 A JP 2008218754A
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Prior art keywords
transformer
electric wire
peripheral side
secondary winding
coil
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Hiromitsu Muto
洋光 武藤
Soshiyo Takizawa
素章 滝沢
Toshiyuki Osabe
敏之 長部
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TDK Lambda Corp
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TDK Lambda Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer providing a reduced size by effectively using a space of a bobbin, meanwhile, capable of increasing the number of adjacent turns on an identical bobbin. <P>SOLUTION: The transformer 1 comprises a core 2, a primary winding 3 having a coil 7 with a wire 6 wound on an outer circumference of the core 2 more than once in a larger diameter direction, and a secondary winding 4 comprising one turn structured metal plate material. The primary winding 3 comprises one end 6a of the wire 6 arranged on an inner periphery side of the coil 7, and the other end 6a of the wire 6 arranged on an outer periphery of the coil 7. The secondary winding 4 comprises a through-hole 10 going through the core 5, a pair of terminal parts 11, and a guiding means 12 for guiding one end of the wire 6 arranged on an inner periphery side of the coil 7 from the inner periphery side to the outer periphery side of the coil 7 with the surface of the secondary winding 4 press contacted to the surface of the coil 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、トランスに関し、特に大容量のスイッチング電源装置に適用され、１次巻線に電線を用い、２次巻線に板状部材を用いたトランスに関するものである。   The present invention relates to a transformer, and more particularly to a transformer that is applied to a large-capacity switching power supply apparatus and uses a wire as a primary winding and a plate-like member as a secondary winding.

従来、大容量のスイッチング電源装置に適用されるトランスは、２次側に大電流が流れることから、２次巻線に金属板を用いている（例えば、特許文献１）。通常、トランスの巻線には、１次巻線、２次巻線共に電線が用いられるが、上記特許文献１では、２次巻線に金属板を用いることにより、大電流が流れる２次巻線の抵抗値を下げるように構成されている。   Conventionally, a transformer applied to a large-capacity switching power supply device uses a metal plate for a secondary winding because a large current flows on the secondary side (for example, Patent Document 1). Normally, electric wires are used for both the primary winding and the secondary winding in the transformer winding. However, in Patent Document 1, a secondary winding in which a large current flows by using a metal plate for the secondary winding. It is configured to lower the resistance value of the line.

一般に、この種の１次巻線は、図５に示すように、電線101を平面状に径大方向へ順に巻いてコイル部102を形成するので、電線の一端103はコイル部102の内周側、他端104はコイル部102の外周側に配置されることになる。従って、１次巻線は、前記電線101の一端103を前記コイル部102の内周側から外周側へコイル部102を跨いで外部に送出させ、その電線101の他端104をコイル部102の外周側からそのまま外部に送出させることにより、それら一端103及び他端104を外部部品と電気的に接続するように構成される。   Generally, in this type of primary winding, as shown in FIG. 5, the electric wire 101 is wound in a flat shape in order in the diameter increasing direction to form the coil portion 102, so The other end 104 is disposed on the outer peripheral side of the coil portion 102. Therefore, the primary winding causes one end 103 of the electric wire 101 to be sent to the outside from the inner peripheral side to the outer peripheral side of the coil portion 102 across the coil portion 102, and the other end 104 of the electric wire 101 is connected to the coil portion 102. It is configured to electrically connect the one end 103 and the other end 104 to an external component by sending them to the outside as they are from the outer peripheral side.

そしてトランスは、ボビンの円筒状の巻枠の外周に、上記１次巻線を設置し、その上から絶縁シートを介して２次巻線が巻き回されて構成される。
特開昭６４−３０４６３号公報 The transformer is configured by installing the primary winding on the outer periphery of a cylindrical winding frame of a bobbin and winding the secondary winding through an insulating sheet from above.
JP-A 64-30463

しかしながら、上記のような１次巻線で構成したトランスでは、電線101の一端103がコイル部102を内周側から外周側へかけて跨ぐため、１次巻線の表面に巻き回した２次巻線が、電線101の直径分だけ浮き上がり、その分トランス全体が厚くなる。すなわち、この電線101の直径に対応する部分105は、デッドスペースとなり、トランス全体としては、巻枠を有効に利用できないという問題がある。   However, in the transformer configured with the primary winding as described above, since the one end 103 of the electric wire 101 straddles the coil portion 102 from the inner peripheral side to the outer peripheral side, the secondary wound around the surface of the primary winding. The winding is lifted by the diameter of the electric wire 101, and the entire transformer is thickened accordingly. That is, the portion 105 corresponding to the diameter of the electric wire 101 becomes a dead space, and there is a problem that the winding frame cannot be used effectively as the entire transformer.

そこで、本発明は上記した問題点に鑑み、巻枠のスペースを有効に利用して小型化することができ、一方、同じ巻枠であれば巻き数を増やすことができるトランスを提供することを目的とする。   Therefore, in view of the above-described problems, the present invention provides a transformer that can effectively reduce the size of the reel by using the space of the reel, and can increase the number of turns if the reel is the same. Objective.

上記目的を達成するために、請求項１に係る発明は、コアと、前記コアの外周に電線を径大方向へ順に複数回巻装したコイル部を備える１次巻線と、一回巻構造の金属板材からなる２次巻線とを備えるトランスにおいて、前記１次巻線は、前記電線の一端を前記コイル部の内周側に配置し、前記電線の他端を前記コイル部の外周側に配置してなり、前記２次巻線は、前記コアを挿通する貫通穴と、一対の端子部と、前記２次巻線の表面を前記コイル部の表面に当接させたまま、前記コイル部の内周側に配置された前記電線の一端を、前記コイル部の内周側から外周側へ誘導する誘導手段とを備えることを特徴とする。   In order to achieve the above object, the invention according to claim 1 includes a core, a primary winding including a coil portion in which an electric wire is wound around the outer periphery of the core in order in a large diameter direction, and a single turn structure. A transformer having a secondary winding made of a metal plate material, wherein the primary winding has one end of the electric wire disposed on the inner peripheral side of the coil portion, and the other end of the electric wire is positioned on the outer peripheral side of the coil portion. The secondary winding includes the through-hole through which the core is inserted, a pair of terminal portions, and the surface of the secondary winding in contact with the surface of the coil portion. And a guiding means for guiding one end of the electric wire disposed on the inner peripheral side of the coil portion from the inner peripheral side to the outer peripheral side of the coil portion.

また、請求項２に係る発明は、前記誘導手段は、前記貫通穴の周縁に形成されていることを特徴とする。   The invention according to claim 2 is characterized in that the guiding means is formed at the periphery of the through hole.

また、請求項３に係る発明は、前記誘導手段は、凹部であることを特徴とする。   The invention according to claim 3 is characterized in that the guiding means is a recess.

また、請求項４に係る発明は、前記誘導手段は、有底の溝部であることを特徴とする。   The invention according to claim 4 is characterized in that the guiding means is a bottomed groove.

また、請求項５に係る発明は、前記１次巻線と前記２次巻線とを交互に複数配置したことを特徴とする。   The invention according to claim 5 is characterized in that a plurality of the primary windings and the secondary windings are alternately arranged.

本発明の請求項１記載のトランスによれば、誘導手段を備えたことにより、前記２次巻線の表面を前記コイル部の表面に当接させたまま、前記コイル部の内周側に配置された前記電線の一端を、前記コイル部の内周側から外周側へ誘導できるので、巻枠のスペースを有効に利用して小型化することができ、一方、同じ巻枠であれば巻き数を増やすことができる。   According to the transformer of the first aspect of the present invention, the induction means is provided, so that the surface of the secondary winding is disposed on the inner peripheral side of the coil portion while being in contact with the surface of the coil portion. Since one end of the electric wire can be guided from the inner peripheral side to the outer peripheral side of the coil portion, the space of the winding frame can be effectively used, and the size can be reduced. Can be increased.

また、請求項２に記載のトランスによれば、コアの外周面となるコイル部の内周側に配置された電線の一端を確実に外周側に誘導することができる。   Moreover, according to the transformer of Claim 2, the end of the electric wire arrange | positioned at the inner peripheral side of the coil part used as the outer peripheral surface of a core can be reliably guide | induced to the outer peripheral side.

また、請求項３に記載のトランスによれば、上方から電線の一端の位置を視認することができるので、容易に２次巻線を位置決めして、設置することができる。   According to the transformer of the third aspect, since the position of one end of the electric wire can be visually recognized from above, the secondary winding can be easily positioned and installed.

また、請求項４に記載のトランスによれば、誘導手段の設置に伴う２次巻線の断面積の減少を抑制することができる。   According to the transformer of the fourth aspect, it is possible to suppress a reduction in the cross-sectional area of the secondary winding accompanying the installation of the induction means.

また、請求項５に記載のトランスによれば、層数が増えた分だけリーケージを減少させることができる。   Further, according to the transformer of the fifth aspect, the leakage can be reduced by the amount of increase in the number of layers.

以下図面を参照して、本発明の好適な実施形態について説明する。図１に示すトランス１は、コア２、１次巻線３及び２次巻線４とを備える。このトランス１は、全体として、１次巻線３に断続的に電流を流すことにより、コア２内を通る磁束を発生、変化させる。このように発生、変化した磁束が２次巻線４と鎖交することにより、２次巻線４、すなわちトランス１の２次側に電圧を誘起し得るように構成されている。   Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. A transformer 1 shown in FIG. 1 includes a core 2, a primary winding 3, and a secondary winding 4. The transformer 1 generates and changes a magnetic flux passing through the core 2 by causing a current to flow intermittently through the primary winding 3 as a whole. The magnetic flux generated and changed in this way is linked to the secondary winding 4 so that a voltage can be induced on the secondary winding 4, that is, the secondary side of the transformer 1.

コア２は、例えば鉄心又はフェライトコアなどの高透磁率部材からなり、円筒状の脚部５を備える。１次巻線３は、従来と同様の３層絶縁電線６からなり、前記電線６を径大方向へ順に複数回巻き回して形成したコイル部７を備える。この前記１次巻線３は、巻始めとなる前記電線６の一端6aを前記コイル部７の内周側に配置し、巻き終りとなる前記電線６の他端6bを前記コイル部７の外周側に配置してなる。従って、１次巻線３の一端6aは、コイル部７の内周側から外周側へかけてコイル部７を跨いで外部へ送出される。一方、１次巻線３の他端6bは、コイル部７の外周側からそのまま外部へ送出される。この１次巻線３のコイル部７はコア２の脚部５に巻装される。２次巻線４は、例えば銅板などの扁平板状の金属板材から形成される。また、１次巻線３の中間には、絶縁板８が設けられている。   The core 2 is made of a high permeability member such as an iron core or a ferrite core, and includes a cylindrical leg portion 5. The primary winding 3 includes a three-layer insulated electric wire 6 similar to the conventional one, and includes a coil portion 7 formed by winding the electric wire 6 a plurality of times in the radial direction. In the primary winding 3, one end 6 a of the electric wire 6 at the beginning of winding is arranged on the inner peripheral side of the coil portion 7, and the other end 6 b of the electric wire 6 at the end of winding is connected to the outer periphery of the coil portion 7. It is arranged on the side. Accordingly, one end 6a of the primary winding 3 is sent to the outside across the coil portion 7 from the inner peripheral side to the outer peripheral side of the coil portion 7. On the other hand, the other end 6 b of the primary winding 3 is sent to the outside as it is from the outer peripheral side of the coil portion 7. The coil portion 7 of the primary winding 3 is wound around the leg portion 5 of the core 2. The secondary winding 4 is formed from a flat plate-like metal plate material such as a copper plate. An insulating plate 8 is provided in the middle of the primary winding 3.

２次巻線４は、前記コア２の脚部５を挿通する貫通穴10、一対の端子部11及び誘導手段としての凹部12とを備え、前記１次巻線３をサンドイッチ状に挟み込むように配置される。凹部12は、貫通穴10の周縁を「コ」字状に切り抜いて形成される。この凹部12は、貫通穴10の周縁から半径方向に延び、奥行きが巻き幅である１次巻線３の軸直角方向長さより長く形成され、幅が１次巻線３を構成する電線６の直径より長く形成される。   The secondary winding 4 includes a through hole 10 through which the leg portion 5 of the core 2 is inserted, a pair of terminal portions 11 and a concave portion 12 as a guiding means, and sandwiches the primary winding 3 in a sandwich shape. Be placed. The recess 12 is formed by cutting the periphery of the through hole 10 into a “U” shape. The recess 12 extends in the radial direction from the periphery of the through hole 10 and is formed to be longer than the length in the direction perpendicular to the axis of the primary winding 3 whose depth is the winding width, and the width of the electric wire 6 constituting the primary winding 3. It is formed longer than the diameter.

このように構成されたトランス１は、２次巻線４の表面をコイル部７の表面に当接させ、２次巻線４で１次巻線３をサンドイッチ状に挟み込むようにして構成されている。ここで、上記したように１次巻線３は、一端6aがコイル部７の内周側から外周側へかけてコイル部７を跨いで送出されているので、１次巻線３全体の軸方向長さは、コイル部７の高さに電線６の直径分を加えた長さとなる。従って、金属板材からなる通常の２次巻線４で１次巻線３を挟み込むと、２次巻線４の表面がコイル部７の表面よりが電線６の直径分だけ浮き上がり、２次巻線４の表面とコイル部７との間にデッドスペースが生じる。ところが、本発明に係る凹部12を備えた２次巻線４によれば、図２に示すように、凹部12に電線６の一端6aを挿通することにより、前記２次巻線４の表面を前記１次巻線３の表面に当接させたまま、コイル部７を跨いでいる電線６の一端6aを凹部12によってコイル部７の内周側から外周側へ誘導することができる。従って、トランス１は、電線６の直径分だけ軸方向長さを短くすることができるので、巻枠のスペースを有効に利用して小型化を実現することができる。   The transformer 1 configured as described above is configured such that the surface of the secondary winding 4 is brought into contact with the surface of the coil portion 7 and the primary winding 3 is sandwiched between the secondary windings 4. Yes. Here, as described above, the primary winding 3 is fed with the end 6a straddling the coil portion 7 from the inner peripheral side to the outer peripheral side of the coil portion 7, so that the axis of the entire primary winding 3 is transmitted. The direction length is a length obtained by adding the diameter of the electric wire 6 to the height of the coil portion 7. Accordingly, when the primary winding 3 is sandwiched between the normal secondary winding 4 made of a metal plate material, the surface of the secondary winding 4 is lifted from the surface of the coil portion 7 by the diameter of the electric wire 6. A dead space is generated between the surface of 4 and the coil portion 7. However, according to the secondary winding 4 having the recess 12 according to the present invention, the surface of the secondary winding 4 is formed by inserting one end 6a of the electric wire 6 into the recess 12 as shown in FIG. One end 6a of the electric wire 6 straddling the coil portion 7 can be guided from the inner peripheral side to the outer peripheral side of the coil portion 7 by the concave portion 12 while being in contact with the surface of the primary winding 3. Therefore, the transformer 1 can be shortened in the axial direction by the diameter of the electric wire 6, so that the size reduction can be realized by effectively utilizing the space of the winding frame.

また、トランス１では、２次巻線４の表面を前記１次巻線３の表面に当接させておくことができるので、１次巻線３と２次巻線４との磁気的な結合を改善することができる。また、トランス１は、実際には１次巻線３と２次巻線４とを軸方向に複数、層状に重ねて構成するので、層数が増えると、その分だけリーケージを減少させることができる。   In the transformer 1, the surface of the secondary winding 4 can be brought into contact with the surface of the primary winding 3, so that the primary winding 3 and the secondary winding 4 are magnetically coupled. Can be improved. In addition, since the transformer 1 is actually configured by laminating a plurality of primary windings 3 and secondary windings 4 in the axial direction in layers, the leakage can be reduced by an increase in the number of layers. it can.

一方、同じ巻枠とした場合、すなわち軸方向長さを従来と同じ長さとした場合には、従来に比べ単位長さあたりの層数を増やすことができる。従来に比べ単位長さあたりの層数が増えると、本発明のトランス１では１次巻線３及び２次巻線４共に、単位長さあたりの断面積を増加させることができるので、熱の上昇を抑制することができる。   On the other hand, when the same reel is used, that is, when the axial length is the same as the conventional length, the number of layers per unit length can be increased compared to the conventional one. When the number of layers per unit length is increased as compared with the conventional case, in the transformer 1 of the present invention, the cross-sectional area per unit length can be increased for both the primary winding 3 and the secondary winding 4. The rise can be suppressed.

さらに、誘導手段を凹部12としたことにより、上方から電線６の一端6aの位置を視認することができるので、１次巻線３に対し２次巻線４を容易に、かつ確実に位置決めして、設置することができる。   Further, since the guiding means is the recess 12, the position of the one end 6a of the electric wire 6 can be visually confirmed from above, so that the secondary winding 4 can be easily and reliably positioned with respect to the primary winding 3. Can be installed.

上記した実施形態では誘導手段として凹部12を設けた場合について説明したが、図３に示すように、凹部12に替えて有底の溝部20を設けることとしてもよい。溝部20は、貫通穴10の周縁から半径方向に延びるように形成され、高さ方向の長さが少なくとも電線６の直径より長く、半径方向の長さが１次巻線３の軸直角方向長さより長く、円周方向の長さが１次巻線３を構成する電線６の直径より長くなるように形成される。このように誘導手段として有底の溝部20を設けることとしたことにより、誘導手段の設置に伴う２次巻線４の断面積の減少を抑制することができる。すなわち、誘導手段を溝部20とすることにより、上記凹部12を設ける場合に比べ、２次巻線４の断面積を増やすことができる。   In the embodiment described above, the case where the concave portion 12 is provided as the guiding means has been described. However, as shown in FIG. 3, a bottomed groove portion 20 may be provided instead of the concave portion 12. The groove portion 20 is formed so as to extend in the radial direction from the periphery of the through hole 10, has a length in the height direction that is at least longer than the diameter of the electric wire 6, and a length in the radial direction is a length perpendicular to the axis of the primary winding 3. The circumferential length is longer than the diameter of the electric wire 6 constituting the primary winding 3. Thus, by providing the bottomed groove portion 20 as the guiding means, it is possible to suppress a reduction in the cross-sectional area of the secondary winding 4 due to the installation of the guiding means. That is, by using the groove portion 20 as the guiding means, the cross-sectional area of the secondary winding 4 can be increased compared to the case where the concave portion 12 is provided.

また、誘導手段として、図４に示すように、貫通穴10とコア２との間から電線６の一端6aを外周側へ送出することとしてもよい。この場合、貫通穴10の周縁に設けた凹部12は、その奥行きが電線６の直径分の長さで足りるので、２次巻線４の断面積の減少をより抑制することができる。   Further, as the guiding means, as shown in FIG. 4, one end 6 a of the electric wire 6 may be sent to the outer peripheral side from between the through hole 10 and the core 2. In this case, since the recess 12 provided on the periphery of the through hole 10 has a depth sufficient for the diameter of the electric wire 6, the reduction in the cross-sectional area of the secondary winding 4 can be further suppressed.

本発明は、本実施形態に限定されるものではなく、本発明の要旨の範囲内で種々の変形実施が可能である。   The present invention is not limited to this embodiment, and various modifications can be made within the scope of the gist of the present invention.

本発明に係るトランスの全体構成を示す斜視図である。1 is a perspective view showing an overall configuration of a transformer according to the present invention. 同上、部分断面図である。It is a fragmentary sectional view same as the above. 同上、変形例を示す部分断面図である。It is a fragmentary sectional view showing a modification same as the above. 同上、別の変形例を示す部分断面図である。It is a fragmentary sectional view showing another modification same as the above. 同上、従来例を示す図であり、（Ａ）平面図、（Ｂ）正面図である。It is a figure which shows a prior art example same as the above, (A) Top view, (B) Front view.

符号の説明Explanation of symbols

１ トランス
２ コア
３ １次巻線
４ ２次巻線
６ 電線
７ コイル部
10 貫通穴
11 端子部
12 凹部（誘導手段）
20 溝部（誘導手段） 1 transformer 2 core 3 primary winding 4 secondary winding 6 electric wire 7 coil part
10 Through hole
11 Terminal
12 Recessed part (guidance means)
20 Groove (guidance means)

Claims (5)

コアと、
前記コアの外周に電線を径大方向へ順に複数回巻装したコイル部を備える１次巻線と、
一回巻構造の金属板材からなる２次巻線と
を備えるトランスにおいて、
前記１次巻線は、
前記電線の一端を前記コイル部の内周側に配置し、前記電線の他端を前記コイル部の外周側に配置してなり、
前記２次巻線は、
前記コアを挿通する貫通穴と、
一対の端子部と、
前記２次巻線の表面を前記コイル部の表面に当接させたまま、前記コイル部の内周側に配置された前記電線の一端を、前記コイル部の内周側から外周側へ誘導する誘導手段と
を備えることを特徴とするトランス。 The core,
A primary winding provided with a coil portion in which an electric wire is wound around the outer periphery of the core a plurality of times in the radial direction;
In a transformer having a secondary winding made of a metal plate material of a single turn structure,
The primary winding is
One end of the electric wire is arranged on the inner peripheral side of the coil part, and the other end of the electric wire is arranged on the outer peripheral side of the coil part,
The secondary winding is
A through hole for passing through the core;
A pair of terminal portions;
One end of the electric wire arranged on the inner peripheral side of the coil part is guided from the inner peripheral side to the outer peripheral side of the coil part while keeping the surface of the secondary winding in contact with the surface of the coil part. And a transformer. 前記誘導手段は、前記貫通穴の周縁に形成されていることを特徴とする請求項１記載のトランス。   The transformer according to claim 1, wherein the guide means is formed on a peripheral edge of the through hole. 前記誘導手段は、凹部であることを特徴とする請求項２記載のトランス。   The transformer according to claim 2, wherein the guiding means is a recess. 前記誘導手段は、有底の溝部であることを特徴とする請求項２記載のトランス。   The transformer according to claim 2, wherein the guide means is a bottomed groove portion. 前記１次巻線と前記２次巻線とを交互に複数配置したことを特徴とする請求項１〜４のうち何れか１項に記載のトランス。   The transformer according to any one of claims 1 to 4, wherein a plurality of the primary windings and the secondary windings are alternately arranged.
JP2007054783A 2007-03-05 2007-03-05 Transformer Pending JP2008218754A (en)

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Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0513027U (en) * 1991-07-26 1993-02-19 株式会社タムラ製作所 Sheet coil for transformer
JPH05166648A (en) * 1991-12-12 1993-07-02 Tdk Corp Power supply transformer
JPH0672229U (en) * 1993-03-26 1994-10-07 東光株式会社 Step-up transformer
JPH0897055A (en) * 1994-09-29 1996-04-12 Fuji Electric Co Ltd Power supply transformer
JPH08172017A (en) * 1994-12-15 1996-07-02 Tamura Seisakusho Co Ltd Thin transformer
JP2001035730A (en) * 1999-07-19 2001-02-09 Tamura Seisakusho Co Ltd High-frequency transformer
JP2001267153A (en) * 2000-03-21 2001-09-28 Tdk Corp Power transformer
JP2001313220A (en) * 2000-04-28 2001-11-09 Densei Lambda Kk Inductance part
JP2002093634A (en) * 2000-09-19 2002-03-29 Matsushita Electric Ind Co Ltd Low-profile transformer
JP2002280225A (en) * 2001-03-22 2002-09-27 Origin Electric Co Ltd Flat coil, its manufacturing method and transformer simple flat coil
JP2004253732A (en) * 2003-02-21 2004-09-09 Denso Corp Transformer and its assembling method
JP2005150195A (en) * 2003-11-12 2005-06-09 Matsushita Electric Ind Co Ltd Transformer
WO2005086187A1 (en) * 2004-03-09 2005-09-15 Matsushita Electric Industrial Co., Ltd. Transformer
JP2007035664A (en) * 2005-07-22 2007-02-08 Sumida Corporation Transformer unit

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0513027U (en) * 1991-07-26 1993-02-19 株式会社タムラ製作所 Sheet coil for transformer
JPH05166648A (en) * 1991-12-12 1993-07-02 Tdk Corp Power supply transformer
JPH0672229U (en) * 1993-03-26 1994-10-07 東光株式会社 Step-up transformer
JPH0897055A (en) * 1994-09-29 1996-04-12 Fuji Electric Co Ltd Power supply transformer
JPH08172017A (en) * 1994-12-15 1996-07-02 Tamura Seisakusho Co Ltd Thin transformer
JP2001035730A (en) * 1999-07-19 2001-02-09 Tamura Seisakusho Co Ltd High-frequency transformer
JP2001267153A (en) * 2000-03-21 2001-09-28 Tdk Corp Power transformer
JP2001313220A (en) * 2000-04-28 2001-11-09 Densei Lambda Kk Inductance part
JP2002093634A (en) * 2000-09-19 2002-03-29 Matsushita Electric Ind Co Ltd Low-profile transformer
JP2002280225A (en) * 2001-03-22 2002-09-27 Origin Electric Co Ltd Flat coil, its manufacturing method and transformer simple flat coil
JP2004253732A (en) * 2003-02-21 2004-09-09 Denso Corp Transformer and its assembling method
JP2005150195A (en) * 2003-11-12 2005-06-09 Matsushita Electric Ind Co Ltd Transformer
WO2005086187A1 (en) * 2004-03-09 2005-09-15 Matsushita Electric Industrial Co., Ltd. Transformer
JP2007035664A (en) * 2005-07-22 2007-02-08 Sumida Corporation Transformer unit

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