JP3543028B2

JP3543028B2 - Converter transformer

Info

Publication number: JP3543028B2
Application number: JP10333495A
Authority: JP
Inventors: 重慶金谷; 千秋立岡
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 1995-04-27
Filing date: 1995-04-27
Publication date: 2004-07-14
Anticipated expiration: 2019-07-14
Also published as: JPH08298218A

Description

【０００１】
【産業上の利用分野】
本発明はビデオテープレコーダ、ディスプレイ、プリンタ等の各種電子機器に組み込まれるスイッチング電源に使用するコンバータトランスに関するものである。
【０００２】
【従来の技術】
近年、各種電子機器に組み込まれるスイッチング電源は、小型・軽量・高効率であるとともに、ノイズ性能の良いことが重要な課題となっている。この課題を解決するために、小型・軽量・高効率で良好なノイズ性能を実現できるコンバータトランスの技術開発が非常に重要である。
【０００３】
以下に従来のコンバータトランスの一例を図７および図８を用いて説明する。図７は半断面図を示すものであり、図８は巻線の結線図を示すものである。図７および図８において、１は一次側電源の入力巻線（以下、一次巻線と呼ぶ）で１ａおよび１ｂは一次巻線１の分割巻線、３，４，５，６および７は二次側負荷に電力を供給する出力巻線（以下、二次巻線と呼ぶ）であり、３および４は二次側負荷に大電力を供給する主の二次巻線で、５，６および７は二次側負荷に小電力を供給する補助の二次巻線である。また、２は一次側の制御ＩＣの電源に電力を供給する出力巻線（以下、一次補助巻線と呼ぶ）、８はコイルボビン、１１は各巻線間の絶縁材料、１０はフェライトコアからなる磁芯である。
【０００４】
この種のコンバータトランスは、コイルボビン８に一次巻線１の分割巻線１ａ、二次巻線３〜７、一次巻線１の分割巻線１ｂ、一次補助巻線２の順に各巻線間に厚さが２５μｍまたは５０μｍのポリエチレンテレフタレート粘着テープ１１を巻装して絶縁し、フェライトコアからなる磁芯１０を組込んで形成されている。この場合、二次巻線３，４，５，６および７は一次巻線１の分割巻線１ａと１ｂの間に巻装され、一次巻線１の分割巻線１ａと１ｂは直列に接続されるのが一般的である。
【０００５】
次に従来のコンバータトランスの他の例を図９および図１０を用いて説明する。なお、上述の従来例と同一部分には同一番号を付与して説明する。図９は半断面図を示すものであり、図１０は巻線の結線図を示すものである。図９および図１０において、１は一次巻線で１ａおよび１ｂは一次巻線１の分割巻線、３，４，５，６および７は二次巻線であり、３および４は二次側負荷に大電力を供給する主の二次巻線で、５，６および７は二次側負荷に小電力を供給する補助の二次巻線である。また、２は一次補助巻線、８ａはコイルボビン、１０はフェライトコアからなる磁芯である。
【０００６】
この種のコンバータトランスは、３個の巻溝９を有するコイルボビン８ａの１番目の巻溝９ａに一次巻線１の分割巻線１ａを巻装し、２番目の巻溝９ｂに二次巻線３，４，５，６および７を巻装し、３番目の巻溝９ｃに一次巻線１の分割巻線１ｂと一次補助巻線２を巻装し、一次巻線１の分割巻線１ａと１ｂを直列に接続し、フェライトコアからなる磁芯を組込んで形成している。
【０００７】
【発明が解決しようとする課題】
しかしながら、図７および図８に示すようなコンバータトランスの構成では、各巻線の巻幅寸法を大きくできるため、一次巻線１と二次巻線３〜７の対向面積も大きくでき、また、各巻線間の絶縁を薄いフィルムで構成できるため、一次巻線１と二次巻線３〜７の対向距離も小さくできる。この結果、一次巻線１と二次巻線３，４，５，６および７のそれぞれの結合を非常に高くでき、変換効率の良いコンバータトランスが得られる。
【０００８】
その反面、主の二次巻線３および４が供給している主の出力負荷が変動した場合、補助の二次巻線５，６および７は、一次巻線１との結合が高いため、出力電圧の変動が大きくなる。さらに、巻線の位置が変化しやすい構造であり、かつ、結合も非常に高いため、巻線の位置が少し変化するだけでも結合が大きく変化し、出力電圧も変化する。また、一次巻線１と全二次巻線３〜７の浮遊容量が大きく、インピーダンスも小さくなるため、高周波のノイズ成分が伝達しやすく、ノイズ性能が悪い。
【０００９】
一方、図９および図１０に示すようなコンバータトランスの構成では、コイルボビン８の１番目の巻溝９ａに一次巻線１の分割巻線１ａを巻装し、３番目の巻溝９ｃに一次巻線１の分割巻線１ｂを巻装し、その間の２番目の巻溝９ｂに全ての二次巻線３〜７を巻装しているため、２番目の巻溝９ｂの幅を大きくする必要がある。
【００１０】
このことから、主の二次巻線３および４は、巻線の巻幅が大きくなるため、一次巻線１と二次巻線３および４の対向距離も大きくなり、また、巻線の高さが小さくなるため、一次巻線１と二次巻線３および４の対向面積も小さくなる。この結果、一次巻線１と全二次巻線３〜７の浮遊容量を小さくでき、インピーダンスが大きくなるため、高周波のノイズ成分が伝達しにくく、ノイズ性能が良い。
【００１１】
その反面、一次巻線１と二次巻線３および４のそれぞれの結合が低くなり、変換効率が悪くなる。また、補助の二次巻線５，６および７は、主の二次巻線３および４が供給している主の出力負荷が変動した場合、補助の二次巻線５，６および７と一次巻線１との結合が、主の二次巻線３および４と一次巻線１との結合とほぼ近い値であるため、出力電圧の変動が大きくなる。
【００１２】
本発明は上記課題を解決するもので、効率、出力電圧特性、ノイズ性能が良く、かつ、高信頼性の高いコンバータトランスを提供することを目的とする。
【００１３】
【課題を解決するための手段】
この課題を解決するために本発明は、複数の巻溝を有するコイルボビンに、一次巻線と複数の二次巻線をともに巻装し、磁芯を組込んだ構造のコンバータトランスにおいて、コイルボビンのほぼ中央の巻溝に一次巻線を巻装し、一次巻線の両側の巻溝に主の主力負荷に供給する二次巻線を巻装し、主の主力負荷に供給する二次巻線のさらに外側の巻溝に補助の出力負荷に供給する二次巻線を巻装しており、主の主力負荷に供給する二次巻線は２つの分割巻線からなる複数の二次巻線を互いに接続してなり、この２つの分割巻線を一次巻線の両側の巻溝にそれぞれ巻装した構成である。
【００１４】
【作用】
この構成によって、一次巻線と主の出力負荷に供給する二次巻線の対向距離を小さくし、かつ、対向面積を大きくすることで、結合を高くすることができるとともに、一次巻線と補助の出力負荷に供給する二次巻線の対向距離を大きくすることで、結合を低くすることができるものである。
【００１５】
【実施例】
（実施例１）
以下、本発明のコンバータトランスの一実施例を図１および図２を用いて説明する。４個の巻溝２９を有するコイルボビン２８に、一次巻線２１をコイルボビン２８の２番目の巻溝２９ｂに巻装し、主の出力負荷に供給する二次巻線２３および２４をそれぞれ２つの分割巻線２３ａ，２３ｂおよび２４ａ，２４ｂにして一次巻線２１の両側の１番目の巻溝２９ａと３番目の巻溝２９ｃのそれぞれ巻装して並列に接続し、補助の出力負荷に供給する二次巻線２５，２６および２７をさらに外側の４番目の巻溝２９ｄに巻装し、フェライトコアからなるＥ−Ｅ形の磁芯３０を組込んで構成している。なお、一次補助巻線２２は一次巻線２１を巻装している２番目の巻溝２９ｂに巻装されている。
【００１６】
この実施例によれば、主の出力負荷に供給する大電力の二次巻線２３および２４のみをそれぞれ２つの分割巻線２３ａ，２３ｂおよび２４ａ，２４ｂにして、一次巻線２１を巻装した巻溝２９ｂの両側の巻溝２９ａと２９ｃのそれぞれに巻装して並列に接続するように構成しているため、二次巻線２３および２４と一次巻線２１との対向距離を小さくでき、かつ、対向面積を大きくできることによって結合が高くなり、コンバータトランスの変換効率を高くできるという効果が得られる。
【００１７】
また、一般的に主の出力負荷に供給する大電力の二次巻線２３および２４は低電圧・大電流であり、巻装するマグネットワイヤの線径が太く、コイルボビン２８の割れ、変形などの問題があるが、それぞれ２つの分割巻線２３ａ，２３ｂおよび２４ａ，２４ｂにして並列に接続することにより、巻装するマグネットワイヤの線径が細くでき、このような問題をなくすることができるという効果が得られる。
【００１８】
なお、主の出力負荷に供給する大電力の二次巻線２３および２４が高電圧・小電流であれば、それぞれ２つの分割巻線２３ａ，２３ｂおよび２４ａ，２４ｂを直列に接続することによって、同様の効果が得られる。
【００１９】
また、補助の出力負荷に供給する小電力の二次巻線２５，２６および２７をさらに外側の４番目の巻溝２９ｄに巻装するように構成しているため、二次巻線２５，２６および２７と一次巻線２１との対向距離を大きくでき、かつ、対向面積を小さくできることによって結合が低くなり、主の出力負荷が変動しても二次巻線２５，２６および２７の出力電圧の変動を小さくできるという効果が得られる。
【００２０】
さらに、一次巻線２１と主の出力負荷に供給する二次巻線２３および２４の結合と、一次巻線２１と補助の出力負荷に供給する二次巻線２５，２６および２７の結合にめりはりをもたせることで、一次巻線２１と全二次巻線２３〜２７の浮遊容量が小さくなり、インピーダンスを大きくでき、高周波のノイズ成分を伝達しにくく、ノイズ性能が良くできるという効果が得られる。
【００２１】
（実施例２）
以下、本発明のコンバータトランスの第２の実施例を図３および図４を用いて説明する。５個の巻溝３９を有するコイルボビン３８に、一次巻線３１をコイルボビン３８の２番目の巻溝３９ｂと３番目の巻溝３９ｃに巻装し、主の出力負荷に供給する二次巻線３３および３４をそれぞれ２つの分割巻線３３ａ，３３ｂおよび３４ａ，３４ｂにして一次巻線３１の両側の１番目の巻溝３９ａと４番目の巻溝３９ｄのそれぞれに巻装して並列に接続し、補助の出力負荷に供給する二次巻線３５，３６および３７をさらに外側の５番目の巻溝３９ｅに巻装し、フェライトコアからなるＥ−Ｅ形の磁芯４０を組込んで構成している。なお、一次補助巻線３２は一次巻線３１を巻装している２番目の巻溝３９ｂまたは３９ｃに巻装されている。
【００２２】
この実施例によれば、一次巻線３１を連続する２個の巻溝３９ｂおよび３９ｃに巻装するように構成することにより、同一の巻溝に巻装されるコイルの巻始め部と巻終り部に印加される電圧が低くなり、マグネットワイヤの電圧劣化を小さくすることができ、長寿命化が実現できるという効果が得られる。
【００２３】
（実施例３）
以下、本発明のコンバータトランスの第３の実施例を図５および図６を用いて説明する。３個の巻溝４９を有するコイルボビン４８に、一次巻線４１をコイルボビン４８の２番目の巻溝４９ｂに巻装し、主の出力負荷に供給する二次巻線４３および４４をそれぞれ２つの分割巻線４３ａ，４３ｂおよび４４ａ，４４ｂにして一次巻線４１の両側の１番目の巻溝４９ａと３番目の巻溝４９ｃのそれぞれ巻装して並列に接続し、補助の出力負荷に供給する二次巻線４５，４６および４７のうち、二次巻線４５は、主の出力負荷に供給する二次巻線４３および４４の分割巻線４３ａと４４ａと同じ１番目の巻溝４９ａに巻装し、二次巻線４６および４７は、主の出力負荷に供給する二次巻線４３および４４の分割巻線４３ｂと４４ｂと同じ３番目の巻溝４９ｃに巻装し、フェライトコアからなるＥ−Ｅ形の磁芯５０を組込んで構成している。なお、一次補助巻線４２は一次巻線４１を巻装している２番目の巻溝４９ｂに巻装されている。
【００２４】
この実施例によれば、補助の主の出力負荷に供給する二次巻線４５，４６および４７を主の出力負荷に供給する二次巻線４３および４４の分割巻線４３ａ，４３ｂおよび４４ａ，４４ｂと同じ巻溝４９ａまたは４９ｃに分散して巻装するように構成することにより、巻溝４９の数量を少なくでき、コンバータトランスの小型化ができるという効果が得られる。
【００２５】
【発明の効果】
以上のように本発明のコンバータトランスは、コイルボビンのほぼ中央の巻溝に一次巻線を巻装し、一次巻線の両側の巻溝に主の主力負荷に供給する二次巻線を巻装し、主の主力負荷に供給する二次巻線のさらに外側の巻溝に補助の出力負荷に供給する二次巻線を巻装しており、主の主力負荷に供給する二次巻線は２つの分割巻線からなる複数の二次巻線を互いに接続してなり、この２つの分割巻線を一次巻線の両側の巻溝にそれぞれ巻装した構成にすることにより、
（１）一次巻線と主の主力負荷に供給する二次巻線の結合を高くすることができ、変換効率を良くすることができる。
（２）一次巻線と補助の出力負荷に供給する二次巻線の結合を低くすることができ、主の主力負荷が負荷変動しても二次巻線の出力電圧の変動を小さくできる。（３）一次巻線と主の出力負荷に供給する二次巻線の結合と、一次巻線と補助の出力負荷に供給する二次巻線の結合にめりはりをもたせることで、一次巻線と全二次巻線の浮遊容量を小さくし、インピーダンスを大きくして、高周波のノイズ成分が伝達しにくく、高ノイズ性能化を実現できる。
【００２６】
また、一次巻線を連続する２個の巻溝に巻装した構成にした場合には、
（４）一次巻線の線間に印加される電圧が低くなり、マグネットワイヤの電圧劣化を小さくすることができ、長寿命化が実現できる。
【００２７】
また、補助の出力負荷に供給する二次巻線を、主の出力負荷に供給する二次巻線の分割巻線と同じ巻溝に巻装した構成にした場合には
（５）巻溝の数量を減らせることができ、コンバータトランスのより小型化ができる。
等の多大な効果が得られ、効率、出力電圧特性、ノイズ性能が良く、かつ、信頼性の高いコンバータトランスを安価に提供することができ、工業的価値の大なるものである。
【図面の簡単な説明】
【図１】本発明のコンバータトランスの一実施例である実施例１の断面を示す半断面図
【図２】同巻線の結線を示す結線図
【図３】同第２の実施例の断面を示す半断面図
【図４】同巻線の結線を示す結線図
【図５】同第３の実施例の断面を示す半断面図
【図６】同巻線の結線を示す結線図
【図７】従来のコンバータトランスの断面を示す半断面図
【図８】同巻線の結線を示す結線図
【図９】同他の従来技術に係るコンバータトランスの断面を示す半断面図
【図１０】同巻線の結線を示す結線図
【符号の説明】
２１一次巻線
２１ａ一次巻線の分割巻線
２１ｂ一次巻線の分割巻線
２２一次補助巻線
２３二次巻線
２３ａ二次巻線２３の分割巻線
２３ｂ二次巻線２３の分割巻線
２４二次巻線
２４ａ二次巻線２４の分割巻線
２４ｂ二次巻線２４の分割巻線
２５二次巻線
２６二次巻線
２７二次巻線
２８コイルボビン
２９巻溝
２９ａ巻溝
２９ｂ巻溝
２９ｃ巻溝
２９ｄ巻溝
３０磁芯[0001]
[Industrial applications]
The present invention relates to a converter transformer used for a switching power supply incorporated in various electronic devices such as a video tape recorder, a display, and a printer.
[0002]
[Prior art]
2. Description of the Related Art In recent years, switching power supplies incorporated in various electronic devices have become important issues in that they have small size, light weight, high efficiency, and good noise performance. To solve this problem, it is very important to develop a technology for a converter transformer that can achieve good noise performance with small size, light weight and high efficiency.
[0003]
An example of a conventional converter transformer will be described below with reference to FIGS. FIG. 7 shows a half sectional view, and FIG. 8 shows a connection diagram of windings. 7 and 8, reference numeral 1 denotes an input winding of a primary-side power supply (hereinafter, referred to as a primary winding), 1a and 1b denote split windings of the primary winding 1, and 3, 4, 5, 6, and 7 denote secondary windings. Output windings (hereinafter referred to as secondary windings) for supplying power to the secondary side load, and 3 and 4 are main secondary windings for supplying large power to the secondary side load. Reference numeral 7 denotes an auxiliary secondary winding for supplying a small power to the secondary load. Reference numeral 2 denotes an output winding for supplying power to the power supply of the primary-side control IC (hereinafter, referred to as a primary auxiliary winding); 8, a coil bobbin; 11, an insulating material between the windings; It is a wick.
[0004]
This type of converter transformer has a coil bobbin 8 in which a split winding 1a of a primary winding 1, secondary windings 3 to 7, a split winding 1b of a primary winding 1, and a primary auxiliary winding 2 are sequentially thickened between respective windings. It is formed by winding a polyethylene terephthalate adhesive tape 11 having a thickness of 25 μm or 50 μm for insulation, and incorporating a magnetic core 10 made of a ferrite core. In this case, the secondary windings 3, 4, 5, 6 and 7 are wound between the divided windings 1a and 1b of the primary winding 1, and the divided windings 1a and 1b of the primary winding 1 are connected in series. Generally, it is done.
[0005]
Next, another example of a conventional converter transformer will be described with reference to FIGS. The same parts as those in the above-described conventional example will be described by giving the same numbers. FIG. 9 shows a half sectional view, and FIG. 10 shows a connection diagram of windings. 9 and 10, 1 is a primary winding, 1a and 1b are divided windings of the primary winding 1, 3, 4, 5, 6 and 7 are secondary windings, and 3 and 4 are secondary windings. Main secondary windings for supplying large power to the load, and auxiliary secondary windings 5, 6, and 7 for supplying small power to the secondary load. 2 is a primary auxiliary winding, 8a is a coil bobbin, and 10 is a magnetic core made of a ferrite core.
[0006]
In this type of converter transformer, the divided winding 1a of the primary winding 1 is wound on the first winding groove 9a of the coil bobbin 8a having three winding grooves 9, and the secondary winding is wound on the second winding groove 9b. 3, 4, 5, 6 and 7 are wound, and the divided winding 1b of the primary winding 1 and the primary auxiliary winding 2 are wound around the third winding groove 9c, and the divided winding 1a of the primary winding 1 is wound. And 1b are connected in series, and are formed by incorporating a magnetic core made of a ferrite core.
[0007]
[Problems to be solved by the invention]
However, in the configuration of the converter transformer as shown in FIGS. 7 and 8, since the winding width of each winding can be increased, the facing area between the primary winding 1 and the secondary windings 3 to 7 can be increased. Since the insulation between the wires can be constituted by a thin film, the facing distance between the primary winding 1 and the secondary windings 3 to 7 can be reduced. As a result, the coupling between the primary winding 1 and the secondary windings 3, 4, 5, 6, and 7 can be made extremely high, and a converter transformer with good conversion efficiency can be obtained.
[0008]
On the other hand, when the main output load supplied by the main secondary windings 3 and 4 fluctuates, the auxiliary secondary windings 5, 6 and 7 have a high coupling with the primary winding 1, so that The output voltage fluctuates greatly. Furthermore, since the structure is such that the position of the winding is easily changed and the coupling is very high, even a small change in the position of the winding greatly changes the coupling and the output voltage. In addition, since the stray capacitance of the primary winding 1 and all the secondary windings 3 to 7 is large and the impedance is small, a high-frequency noise component is easily transmitted, and the noise performance is poor.
[0009]
On the other hand, in the configuration of the converter transformer as shown in FIGS. 9 and 10, the divided winding 1 a of the primary winding 1 is wound around the first winding groove 9 a of the coil bobbin 8, and the primary winding is wound around the third winding groove 9 c. Since the secondary windings 1b of the wire 1 are wound and all the secondary windings 3 to 7 are wound in the second winding groove 9b therebetween, it is necessary to increase the width of the second winding groove 9b. There is.
[0010]
For this reason, the main secondary windings 3 and 4 have a large winding width, so that the facing distance between the primary winding 1 and the secondary windings 3 and 4 also increases, and the height of the windings increases. Therefore, the facing area between the primary winding 1 and the secondary windings 3 and 4 also decreases. As a result, the stray capacitance of the primary winding 1 and all the secondary windings 3 to 7 can be reduced, and the impedance increases, so that high-frequency noise components are not easily transmitted, and the noise performance is good.
[0011]
On the other hand, the coupling between the primary winding 1 and the secondary windings 3 and 4 is low, and the conversion efficiency is low. The auxiliary secondary windings 5, 6 and 7 are connected to the auxiliary secondary windings 5, 6 and 7 when the main output load supplied by the main secondary windings 3 and 4 fluctuates. Since the coupling with the primary winding 1 is almost the same as the coupling between the primary secondary windings 3 and 4 and the primary winding 1, the output voltage fluctuates greatly.
[0012]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a highly reliable converter transformer having good efficiency, output voltage characteristics, and noise performance.
[0013]
[Means for Solving the Problems]
In order to solve this problem, the present invention provides a converter bobbin having a structure in which a primary winding and a plurality of secondary windings are wound together on a coil bobbin having a plurality of winding grooves and a magnetic core is incorporated. almost a primary winding in the center of the winding groove by winding, the primary winding on both sides of the winding secondary winding for supplying to major main load groove wound instrumentation of the secondary winding for supplying to major main load A secondary winding for supplying an auxiliary output load is wound on a winding groove further outside of the secondary winding , and a secondary winding for supplying a main main load is a plurality of secondary windings composed of two divided windings. Are connected to each other, and the two divided windings are wound around the winding grooves on both sides of the primary winding .
[0014]
[Action]
With this configuration, the distance between the primary winding and the secondary winding to be supplied to the main output load can be reduced, and the facing area can be increased to increase the coupling. The coupling can be reduced by increasing the distance between the secondary windings to be supplied to the output load.
[0015]
【Example】
(Example 1)
An embodiment of the converter transformer according to the present invention will be described below with reference to FIGS. The primary winding 21 is wound around the second winding groove 29b of the coil bobbin 28 on the coil bobbin 28 having four winding grooves 29, and the secondary windings 23 and 24 for supplying the main output load are each divided into two parts. The windings 23a, 23b and 24a, 24b are wound around the first winding groove 29a and the third winding groove 29c on both sides of the primary winding 21 and connected in parallel, and are supplied to an auxiliary output load. The next windings 25, 26, and 27 are wound around the outer fourth winding groove 29d, and an EE type magnetic core 30 made of a ferrite core is incorporated therein. The primary auxiliary winding 22 is wound around a second winding groove 29b around which the primary winding 21 is wound.
[0016]
According to this embodiment, only the secondary windings 23 and 24 of high power supplied to the main output load are divided into two divided windings 23a and 23b and 24a and 24b, and the primary winding 21 is wound. Since the windings 29a and 29c on both sides of the winding groove 29b are wound and connected in parallel, the facing distance between the secondary windings 23 and 24 and the primary winding 21 can be reduced. In addition, the coupling area is increased by increasing the facing area, and the effect of increasing the conversion efficiency of the converter transformer is obtained.
[0017]
Generally, the secondary windings 23 and 24 of high power supplied to the main output load are low voltage and large current, the wire diameter of the wound magnet wire is large, and the coil bobbin 28 has cracks and deformation. Although there is a problem, the diameter of the magnet wire to be wound can be reduced by connecting two parallel windings 23a, 23b and 24a, 24b in parallel, thereby eliminating such a problem. The effect is obtained.
[0018]
If the high-power secondary windings 23 and 24 supplied to the main output load have a high voltage and a small current, the two divided windings 23a and 23b and 24a and 24b are connected in series, respectively. Similar effects can be obtained.
[0019]
Further, since the secondary windings 25, 26 and 27 of small electric power to be supplied to the auxiliary output load are wound around the fourth winding groove 29d further outside, the secondary windings 25, 26 and 27 are formed. And 27 and the primary winding 21 can have a large opposing distance and a small opposing area, so that the coupling is low and the output voltage of the secondary windings 25, 26 and 27 can be changed even if the main output load fluctuates. The effect is obtained that the fluctuation can be reduced.
[0020]
Further, only the connection between the primary winding 21 and the secondary windings 23 and 24 supplying the main output load, and the connection between the primary winding 21 and the secondary windings 25, 26 and 27 supplying the auxiliary output load. By providing the beam, the stray capacitance of the primary winding 21 and all the secondary windings 23 to 27 is reduced, the impedance can be increased, the high frequency noise component is hardly transmitted, and the noise performance can be improved. Can be
[0021]
(Example 2)
Hereinafter, a second embodiment of the converter transformer of the present invention will be described with reference to FIGS. The primary winding 31 is wound around the second winding groove 39b and the third winding groove 39c of the coil bobbin 38 on the coil bobbin 38 having five winding grooves 39, and the secondary winding 33 is supplied to the main output load. And 34 are respectively divided into two divided windings 33a, 33b and 34a, 34b, wound around each of the first winding groove 39a and the fourth winding groove 39d on both sides of the primary winding 31 and connected in parallel. The secondary windings 35, 36, and 37 to be supplied to the auxiliary output load are further wound around the outer fifth winding groove 39e, and an EE type magnetic core 40 made of a ferrite core is incorporated therein. I have. The primary auxiliary winding 32 is wound around the second winding groove 39b or 39c around which the primary winding 31 is wound.
[0022]
According to this embodiment, by configuring the primary winding 31 to be wound around two continuous winding grooves 39b and 39c, a winding start portion and a winding end portion of a coil wound around the same winding groove are formed. The voltage applied to the portion is reduced, the voltage degradation of the magnet wire can be reduced, and the effect of extending the life can be obtained.
[0023]
(Example 3)
Hereinafter, a third embodiment of the converter transformer of the present invention will be described with reference to FIGS. The primary winding 41 is wound around the second winding groove 49b of the coil bobbin 48 on the coil bobbin 48 having three winding grooves 49, and the secondary windings 43 and 44 for supplying the main output load are each divided into two parts. The windings 43a, 43b and 44a, 44b are wound around the first winding groove 49a and the third winding groove 49c on both sides of the primary winding 41, respectively, and connected in parallel to supply the auxiliary output load. Among the secondary windings 45, 46 and 47, the secondary winding 45 is wound around the same first winding groove 49a as the split windings 43a and 44a of the secondary windings 43 and 44 for supplying the main output load. The secondary windings 46 and 47 are wound around the same third winding groove 49c as the split windings 43b and 44b of the secondary windings 43 and 44 for supplying the main output load, and are formed of an E ferrite core. -E-shaped magnetic core 50 is incorporated . The primary auxiliary winding 42 is wound around a second winding groove 49b around which the primary winding 41 is wound.
[0024]
According to this embodiment, the split windings 43a, 43b and 44a of the secondary windings 43 and 44 for supplying the secondary output loads to the secondary windings 45, 46 and 47 for supplying the auxiliary primary output load. By arranging the winding in a distributed manner in the same winding groove 49a or 49c as 44b, the number of winding grooves 49 can be reduced, and the effect of downsizing the converter transformer can be obtained.
[0025]
【The invention's effect】
Converter transformer of the present invention as described above, wound a primary winding substantially at the center of the winding groove of the coil bobbin, winding instrumentation both sides of the winding secondary winding for supplying to major main load into the groove of the primary winding The secondary winding to supply to the auxiliary output load is wound around the winding groove further outside the secondary winding to supply to the main main load, and the secondary winding to supply to the main main load is A plurality of secondary windings composed of two divided windings are connected to each other, and the two divided windings are wound around grooves on both sides of the primary winding, respectively .
(1) The coupling between the primary winding and the secondary winding supplied to the main main load can be increased, and the conversion efficiency can be improved.
(2) The coupling between the primary winding and the secondary winding supplied to the auxiliary output load can be reduced, and the fluctuation of the output voltage of the secondary winding can be reduced even if the main main load changes. (3) The primary winding is provided with a connection between the primary winding and the secondary winding supplied to the main output load, and the coupling between the primary winding and the secondary winding supplied to the auxiliary output load. The stray capacitance of the wire and all the secondary windings is reduced, the impedance is increased, and high-frequency noise components are not easily transmitted, and high noise performance can be realized.
[0026]
When the primary winding is wound around two continuous winding grooves,
(4) The voltage applied between the lines of the primary winding is reduced, the voltage deterioration of the magnet wire can be reduced, and the service life can be extended.
[0027]
When the secondary winding supplied to the auxiliary output load is wound around the same winding groove as the split winding of the secondary winding supplied to the main output load, (5) the winding groove The quantity can be reduced and the size of the converter transformer can be reduced.
Thus, a highly reliable converter transformer having good efficiency, output voltage characteristics, noise performance, and high reliability can be provided at a low cost, which is of great industrial value.
[Brief description of the drawings]
FIG. 1 is a half cross-sectional view showing a cross section of a first embodiment which is an embodiment of the converter transformer of the present invention. FIG. 2 is a connection diagram showing connection of the same winding. FIG. 3 is a cross section of the second embodiment. FIG. 4 is a connection diagram showing a connection of the same winding. FIG. 5 is a half cross section showing a cross section of the third embodiment. FIG. 6 is a connection diagram showing a connection of the same winding. 7 is a half cross-sectional view showing a cross section of a conventional converter transformer. FIG. 8 is a wiring diagram showing connection of the same winding. FIG. 9 is a half cross-sectional view showing a cross section of another conventional converter transformer. Connection diagram showing connection of the same winding [Explanation of reference numerals]
21 Primary winding 21a Primary winding division winding 21b Primary winding division winding 22 Primary auxiliary winding 23 Secondary winding 23a Secondary winding 23 division winding 23b Secondary winding 23 division winding 24 Secondary winding 24a Split winding 24b of secondary winding 24 Split winding 25 of secondary winding 24 Secondary winding 26 Secondary winding 27 Secondary winding 28 Coil bobbin 29 Winding groove 29a Winding groove 29b Winding Groove 29c Winding groove 29d Winding groove 30 Magnetic core

Claims

In a converter transformer having a structure in which a primary winding and a plurality of secondary windings are wound together on a coil bobbin having a plurality of winding grooves and a magnetic core is incorporated, the primary winding is wound around a winding groove substantially at the center of the coil bobbin. Otherwise, wound instrumentation secondary winding for supplying to both sides of the winding grooves in the main main load of the primary winding, the output load of the further auxiliary outside the winding grooves of the secondary winding for supplying to major main load The secondary winding to be supplied to the main main load is formed by connecting a plurality of secondary windings composed of two divided windings to each other. A converter transformer with windings wound around winding grooves on both sides of the primary winding .

The converter transformer according to claim 1, wherein the primary winding is wound around a plurality of continuous winding grooves.

2. The converter transformer according to claim 1, wherein a plurality of secondary windings including two divided windings are connected in parallel with each other .