JPH06124842A - Step-up transformer - Google Patents
Step-up transformerInfo
- Publication number
- JPH06124842A JPH06124842A JP29923292A JP29923292A JPH06124842A JP H06124842 A JPH06124842 A JP H06124842A JP 29923292 A JP29923292 A JP 29923292A JP 29923292 A JP29923292 A JP 29923292A JP H06124842 A JPH06124842 A JP H06124842A
- Authority
- JP
- Japan
- Prior art keywords
- winding
- bobbin
- transformer
- wound
- base portion
- 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.)
- Granted
Links
Landscapes
- Coils Of Transformers For General Uses (AREA)
- Insulating Of Coils (AREA)
- Advancing Webs (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶表示装置の背面照
明用の冷陰極管を点灯するためのインバータに用いるの
に好適な小型で薄形の昇圧トランスの構成に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a small and thin step-up transformer suitable for use as an inverter for lighting a cold cathode tube for back lighting of a liquid crystal display device.
【０００２】[0002]
【従来の技術】従来のインバータ用昇圧トランスは図７
のように構成されている。複数の鍔１を有する中空のボ
ビン２には、低圧側一次巻線Ｌ1 と高圧側二次巻線Ｌ2
が鍔１で分離して巻回されている。高電圧が発生する二
次巻線Ｌ2 は、さらに鍔１で複数段に分割して巻かれる
ことにより、重なり合う線間の電位差を低くして絶縁破
壊を防止するようにしてある。ボビン２の中空部３には
二つのＥ形コア４、５のそれぞれの中央脚６、７が挿入
され、コア４とコア５が互いに突き合わせて固定されて
いる。そして、これらのボビン２とコア４、５が、端子
を植設した絶縁性のベース（図示せず）の上に固定され
た構造であった。2. Description of the Related Art A conventional booster transformer for an inverter is shown in FIG.
It is configured like. A hollow bobbin 2 having a plurality of collars 1 includes a low-voltage side primary winding L 1 and a high-voltage side secondary winding L 2
Are separated by Tsuba 1 and wound. The secondary winding L 2 in which a high voltage is generated is further divided into a plurality of stages by the collar 1 and wound, so that the potential difference between the overlapping lines is reduced and dielectric breakdown is prevented. The central legs 6 and 7 of the two E-shaped cores 4 and 5 are inserted into the hollow portion 3 of the bobbin 2, and the core 4 and the core 5 are fixed by abutting each other. The bobbin 2 and the cores 4 and 5 are fixed on an insulating base (not shown) in which terminals are planted.
【０００３】[0003]
【発明が解決しようとする課題】この種のトランスは、
表示装置の狭い隙間に取付けられるように薄形に構成す
る必要がある。このため、ボビン２の断面形状が偏平な
長方形となり、巻数が同じでも巻線長が長くなって導体
抵抗が増え効率が低下する欠点があった。従来の角形ト
ランスは、ボビンやコアの下にベースを取付けるので薄
形化の上で５ｍｍ程度が限界であり、これ以上厚みを圧
縮して幅を広げると銅損が著しく増加する問題があっ
た。また、二次巻線Ｌ2 を分割巻きしなければならない
ので、巻線作業が複雑になり、全体の体積が増加する欠
点もあった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
It must be thin so that it can be mounted in a narrow gap of the display device. For this reason, the bobbin 2 has a flat rectangular cross section, and even if the number of turns is the same, the winding length becomes long, the conductor resistance increases, and the efficiency decreases. In the conventional rectangular transformer, the base is mounted under the bobbin and the core, so the thickness is limited to about 5 mm, and there is a problem that if the thickness is further compressed to increase the width, copper loss increases remarkably. . In addition, since the secondary winding L 2 has to be divided and wound, the winding work is complicated and the entire volume is increased.
【０００４】[0004]
【発明の目的】本発明は、銅損が小さく高効率で低背型
の昇圧トランスを提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a high efficiency and low profile step-up transformer having a small copper loss.
【０００５】[0005]
【課題を解決するための手段】本発明の昇圧トランス
は、対向する二側面に端子を植設したベース部とこのベ
ース部のほぼ中央から上方に突出した円筒状の巻軸とを
有するボビンと、巻軸に巻回された一次巻線と、内側か
ら外側に向かって多層に整列巻きされ、ベース部の下方
に配置され一次巻線に電磁結合した二次巻線とを具え、
一次巻線のリード線と二次巻線のリード線をそれぞれボ
ビンの異なる側面の端子に接続した構成を特徴とする。A step-up transformer according to the present invention comprises a bobbin having a base portion in which terminals are planted on two opposite side surfaces and a cylindrical winding shaft projecting upward from substantially the center of the base portion. , A primary winding wound around a winding shaft, and a secondary winding that is aligned and wound in multiple layers from the inner side to the outer side, is disposed below the base portion, and is electromagnetically coupled to the primary winding,
A feature is that the lead wire of the primary winding and the lead wire of the secondary winding are connected to terminals on different side surfaces of the bobbin.
【０００６】[0006]
【実施例】図１〜図４は本発明による昇圧トランスの一
実施例を示すもので、図１は分解斜視図、図２は平面
図、図３は正面断面図、図４は側面断面図である。プラ
スチック製のボビン10は、対向する二側面に複数の端子
21、22、23を植設したベース部11と、このベース部11の
中央から上方に突出した円筒形の巻軸12を備えており、
巻軸12の上端には鍔13を設けてある。ボビン10の一側面
に設けた端子22、23は、二次巻線50のリード線接続用と
外部接続用とに分けてある。すなわち、端子22と短い端
子23は、１本ずつが対になっており、ベース部11の内部
で一体的に繋がった構成となっている。1 to 4 show an embodiment of a step-up transformer according to the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a plan view, FIG. 3 is a front sectional view, and FIG. 4 is a side sectional view. Is. Plastic bobbin 10 has multiple terminals on two opposite sides.
It is provided with a base portion 11 in which 21, 22, 23 are planted, and a cylindrical winding shaft 12 protruding upward from the center of the base portion 11,
A collar 13 is provided on the upper end of the winding shaft 12. The terminals 22 and 23 provided on one side surface of the bobbin 10 are divided into those for connecting the lead wire of the secondary winding 50 and those for external connection. That is, the terminal 22 and the short terminal 23 are paired one by one, and are integrally connected inside the base portion 11.
【０００７】図３及び図４に示すように、ボビン10の巻
軸12には低電圧側の一次巻線30が巻回してあり、ベース
部11の下面に設けた凹部14の中には、高電圧側の二次巻
線50が取付けてある。ベース部11の下方に位置する二次
巻線50は、ベース部11を介して対向した一次巻線30に電
磁結合している。二次巻線50は図６のように線材８を内
側から外側に向かって多層に整列巻きした状態で、図１
のように巻き固められている。このような二次巻線50
は、例えばポリウレタンで被覆した銅線の外側に熱可塑
性の融着性ワニス等を被せた、いわゆる自己融着線を用
い、この線材を加熱するか、あるいは溶剤を塗布しなが
ら、多層に整列巻きした後、冷却又は乾燥することによ
り得られる。As shown in FIGS. 3 and 4, the primary winding 30 of the low voltage side is wound around the winding shaft 12 of the bobbin 10, and in the recess 14 provided in the lower surface of the base portion 11, A secondary winding 50 on the high voltage side is attached. The secondary winding 50 located below the base portion 11 is electromagnetically coupled to the primary winding 30 that faces the secondary winding 50 via the base portion 11. As shown in FIG. 6, the secondary winding 50 is a state in which the wire rod 8 is wound in multiple layers in a line from the inner side to the outer side.
It is packed like. Such a secondary winding 50
For example, a so-called self-bonding wire in which a thermoplastic fusion-bonding varnish is coated on the outside of a copper wire coated with polyurethane is used, and this wire is heated or coated with a solvent, and wound in multiple layers. After that, it is obtained by cooling or drying.
【０００８】60、70は非導電性の磁性体からなるコアで
ある。一対の磁性体コア60、70は、ボビン10を上下方向
から挾んで互いに突き合わされて閉磁路を形成してい
る。図４から明らかなように、上側のコア60は、平板部
61とその両端に一体に形成された外脚62、及び平板部61
の中央に一体に形成された円柱形の中央脚63を有する断
面Ｅ形で、中央脚63は巻軸12の中空部に挿入されてい
る。一方、ボビン10の下側に取付けられたコア70は平板
形をしている。Reference numerals 60 and 70 are cores made of a non-conductive magnetic material. The pair of magnetic cores 60 and 70 sandwich the bobbin 10 from above and below and are abutted against each other to form a closed magnetic circuit. As is clear from FIG. 4, the upper core 60 is a flat plate portion.
61, outer legs 62 integrally formed on both ends thereof, and a flat plate portion 61
The cross-section has an E-shaped section having a cylindrical central leg 63 integrally formed at the center of the central leg 63, and the central leg 63 is inserted into the hollow portion of the winding shaft 12. On the other hand, the core 70 attached to the lower side of the bobbin 10 has a flat plate shape.
【０００９】図３及び図４に示すように、コア60とコア
70の間には絶縁材料からなる薄いシート40を挿入して、
磁気飽和が起きにくい構造としてある。シート40には、
図１に示すようにコア60の中央脚63の横断面よりも僅か
に大きい貫通孔41と、一側面から貫通孔41まで達するス
リット42を設けてある。スリット42の貫通孔41寄りの端
部は、切欠部45を設けて幅広くしてある。また、シート
40の四隅の位置で二つのコア60、70を互いに接着できる
ようにシート40の四隅に切欠部43を形成し、一側面に
は、二次巻線50を取付けたボビン10の凹部14の中にワニ
スのような絶縁性の凝固剤を注入できるように切欠き44
を設けてある。As shown in FIGS. 3 and 4, the core 60 and the core
Insert a thin sheet 40 made of insulating material between 70,
The structure is such that magnetic saturation does not easily occur. Seat 40 has
As shown in FIG. 1, a through hole 41 slightly larger than the cross section of the central leg 63 of the core 60 and a slit 42 extending from one side surface to the through hole 41 are provided. The end of the slit 42 near the through hole 41 is widened by providing a notch 45. Also a sheet
Cutouts 43 are formed in the four corners of the sheet 40 so that the two cores 60, 70 can be adhered to each other at the four corners of the 40, and one side of the recess 14 of the bobbin 10 with the secondary winding 50 mounted therein. Notch to allow injection of an insulating coagulant such as varnish into the 44
Is provided.
【００１０】一次巻線30のリード線31は、図２のように
ベース部11上を通してボビン10の一方の側面に植設され
た端子21に接続してある。巻軸12には、一次巻線30の他
に帰還発振用巻線等が一緒に巻回されることがあり、ま
た途中でタップが取り出されることもある。その場合
は、４本〜６本のリード線が各端子21に接続されること
になる。The lead wire 31 of the primary winding 30 is connected to a terminal 21 which is planted on one side surface of the bobbin 10 through the base portion 11 as shown in FIG. In addition to the primary winding 30, a feedback oscillation winding or the like may be wound around the winding shaft 12, and a tap may be taken out on the way. In that case, 4 to 6 lead wires are connected to each terminal 21.
【００１１】図５に示すように、二次巻線50のリード線
51は、スリット42から引出してシート40の下を通し、さ
らにボビン10の下面に設けた溝15を通して端子23に接続
してある。二次巻線50において、巻き始め側のリード線
51ａと他の部分との間の電位差は、外側の巻き終わり部
分に近くなるほど大きくなる。そこで、絶縁破壊を防止
するために巻き始め側のリード線51ａは、電位差の大き
い部分と絶縁されるようスリット42の奥の切欠部45から
引き出し、シート40の下面を通して端子23に接続してあ
る。また、巻き終わり側のリード線51ｂは、スリット42
から引き出して別の端子23に接続してある。As shown in FIG. 5, the lead wire of the secondary winding 50.
51 is drawn out from the slit 42 and passed under the seat 40, and is further connected to the terminal 23 through the groove 15 provided on the lower surface of the bobbin 10. Lead wire on the winding start side of the secondary winding 50
The potential difference between 51a and the other part increases as it approaches the outer winding end part. Therefore, in order to prevent dielectric breakdown, the lead wire 51a on the winding start side is drawn out from the notch 45 at the back of the slit 42 so as to be insulated from a portion having a large potential difference, and is connected to the terminal 23 through the lower surface of the sheet 40. . Further, the lead wire 51b on the winding end side is provided with the slit 42
And is connected to another terminal 23.
【００１２】図６に示すように、線材８を矢印方向に多
層に巻き重ねていくと、どの層も巻き始めの部分と次層
目の巻き終わりの部分が隣合うことになる。しかし、上
述のトランス構造において、二次巻線50の両端にかかる
電圧が２ｋＶある場合でも、二次巻線50を例えば40層に
巻回すれば、両者間にかかる電圧は２０００÷２０であ
り１００Ｖとなるので、鍔で二次巻線Ｌ2 を複数段に分
割して巻いた従来例と同様、重なり合う線材間の電位差
が低くなり絶縁破壊が防止される。インバータ用の昇圧
トランスの中には二次巻線側の電圧が小さいもので１０
００Ｖ以下のものもあるが、絶縁破壊を防止するために
は、二次巻線50の高さＨを小さくし巻幅Ｗを大きくすれ
ばよい。As shown in FIG. 6, when the wire rod 8 is wound in multiple layers in the direction of the arrow, the winding start portion and the winding end portion of the next layer are adjacent to each other. However, in the above-mentioned transformer structure, even if the voltage applied to both ends of the secondary winding 50 is 2 kV, if the secondary winding 50 is wound, for example, in 40 layers, the voltage applied between them is 2000/20. Since the voltage is 100 V, the potential difference between the overlapping wire rods is reduced, and dielectric breakdown is prevented, as in the conventional example in which the secondary winding L 2 is divided into a plurality of stages and wound by the collar. Some booster transformers for inverters have a small voltage on the secondary winding side.
Although there is a voltage of 00 V or less, the height H of the secondary winding 50 may be reduced and the winding width W may be increased in order to prevent dielectric breakdown.
【００１３】線材を断面が円形の巻軸に巻回する丸形ト
ランスの形状は、角形のものに比べて巻線線材が短縮さ
れるので、同じ磁性材料で同一の性能を実現する場合、
銅損が減り、体積も小さくできる点で有利である。特
に、インバータトランスとして使用する場合は一次巻線
に数１０ｋＨｚの大振幅共振電流が流れるため一次巻線
の銅損低減はトランスの変換効率の改善に大きく寄与で
きる要因となる。The shape of a round transformer in which a wire rod is wound around a winding shaft having a circular cross section has a shorter winding wire rod than that of a rectangular transformer. Therefore, when the same magnetic material achieves the same performance,
It is advantageous in that the copper loss is reduced and the volume can be reduced. In particular, when used as an inverter transformer, a large amplitude resonance current of several tens of kHz flows in the primary winding, and therefore reduction of copper loss in the primary winding is a factor that can greatly contribute to improvement in conversion efficiency of the transformer.
【００１４】[0014]
【発明の効果】本発明によれば、低背形で底面積が小さ
いばかりでなく、巻線線材が短縮されることにより、銅
損が少なく効率のよい昇圧トランスが得られる。According to the present invention, not only a low profile and a small bottom area but also a winding wire material is shortened, whereby a highly efficient step-up transformer with less copper loss can be obtained.
【図１】 本発明のトランスの一実施例を示す一部を切
欠した分解斜視図FIG. 1 is an exploded perspective view with one part cut away showing an embodiment of a transformer of the present invention.
【図２】 同トランスの平面図FIG. 2 is a plan view of the transformer.
【図３】 同トランスの正面断面図FIG. 3 is a front sectional view of the transformer.
【図４】 同トランスの側面断面図FIG. 4 is a side sectional view of the transformer.
【図５】 下側のコアを除いた同トランスの下面図FIG. 5: Bottom view of the same transformer without the lower core
【図６】 多層に整列巻きした巻線の片側の横断面の説
明図FIG. 6 is an explanatory view of a cross section on one side of a winding wire wound in multiple layers.
【図７】 従来のトランスの分解斜視図FIG. 7 is an exploded perspective view of a conventional transformer
10 ボビン 11 ベース部 12 巻軸 21・22・23 端子 30 一次巻線 40 シート 50 二次巻線 60・70 コア 63 中央脚 10 Bobbin 11 Base part 12 Revolving shaft 21 ・ 22 ・ 23 Terminal 30 Primary winding 40 Seat 50 Secondary winding 60 ・ 70 Core 63 Center leg
───────────────────────────────────────────────────── フロントページの続き (72)発明者 新明 昭 埼玉県鶴ヶ島市大字五味ヶ谷18番地 東光 株式会社埼玉事業所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Shinmei 18 Gomigaya, Tsurugashima City, Saitama Prefecture Toko Co., Ltd. Saitama Plant
Claims (2)
部と該ベース部のほぼ中央から上方に突出した円筒状の
巻軸とを有する絶縁性のボビンと、該巻軸に巻回された
一次巻線と、内側から外側に向かって多層に整列巻きさ
れ、且つベース部の下方に配置されて一次巻線に電磁結
合した二次巻線とを具え、一次巻線のリード線と二次巻
線のリード線をそれぞれボビンの異なる側面の端子に接
続したことを特徴とする昇圧トランス。1. An insulative bobbin having a base portion in which terminals are planted on opposite two side surfaces and a cylindrical winding shaft projecting upward from substantially the center of the base portion, and the winding bobbin is wound around the winding shaft. A primary winding and a secondary winding that is wound in multiple layers from the inner side to the outer side and that is arranged below the base portion and electromagnetically coupled to the primary winding. A step-up transformer characterized in that the lead wires of the next winding are connected to terminals on different side surfaces of the bobbin.
て閉磁路を形成する非導電性の磁性体からなる一対のコ
アを具え、少なくとも一方のコアに設けた円柱形の中央
脚をボビンの巻軸の中に挿入した請求項１の昇圧トラン
ス。2. A bobbin winding is provided with a pair of cores made of a non-conductive magnetic material that are vertically butted against each other with a bobbin interposed therebetween to form a closed magnetic circuit, and a cylindrical central leg provided on at least one of the cores. The step-up transformer according to claim 1, which is inserted in the shaft.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4299232A JP2525756B2 (en) | 1992-10-12 | 1992-10-12 | Step-up transformer |
| US07/983,682 US5359313A (en) | 1991-12-10 | 1992-12-01 | Step-up transformer |
| DE4241689A DE4241689C2 (en) | 1991-12-10 | 1992-12-10 | Step-up (high voltage) transformer |
| TW82106282A TW266299B (en) | 1992-10-12 | 1993-08-05 | |
| TW82106288A TW267972B (en) | 1992-10-12 | 1993-08-06 | Method and device for widening thermoplastic thin films |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4299232A JP2525756B2 (en) | 1992-10-12 | 1992-10-12 | Step-up transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06124842A true JPH06124842A (en) | 1994-05-06 |
| JP2525756B2 JP2525756B2 (en) | 1996-08-21 |
Family
ID=17869858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4299232A Expired - Fee Related JP2525756B2 (en) | 1991-12-10 | 1992-10-12 | Step-up transformer |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2525756B2 (en) |
| TW (1) | TW267972B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6201463B1 (en) | 1998-10-13 | 2001-03-13 | Toko, Inc. | Inverter transformer |
-
1992
- 1992-10-12 JP JP4299232A patent/JP2525756B2/en not_active Expired - Fee Related
-
1993
- 1993-08-06 TW TW82106288A patent/TW267972B/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6201463B1 (en) | 1998-10-13 | 2001-03-13 | Toko, Inc. | Inverter transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2525756B2 (en) | 1996-08-21 |
| TW267972B (en) | 1996-01-11 |
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