JP3543029B2

JP3543029B2 - Converter transformer

Info

Publication number: JP3543029B2
Application number: JP13011595A
Authority: JP
Inventors: 正彦宮門; 志郎浦部; 浜三萩野
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 1995-05-29
Filing date: 1995-05-29
Publication date: 2004-07-14
Anticipated expiration: 2019-07-14
Also published as: JPH08330150A

Description

【０００１】
【産業上の利用分野】
本発明はインバータエアコン、汎用インバータ電源等の各種モータ制御機器に組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】
近年各種モータ制御機器に組込まれるスイッチング電源は、低コスト・高性能で安定性が高いことが重要な課題になっている。
【０００３】
この課題を解決するために低コスト・高性能で高安定性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。
【０００４】
以下に従来のコンバータトランスを図９、図１０により説明する。
【０００５】
同図によると、１は１次側電源の入力巻線（以下、１次主巻線と呼ぶ）、３，４，５，６および７は２次側負荷に電力を供給する出力巻線であり、７は２次側に大電力を供給する主の２次巻線（以下、２次主巻線と呼ぶ）で、３，４，５および６は２次側負荷に小電力を供給する補助の２次巻線（以下、２次補助巻線と呼ぶ）である。また、２は１次側のスイッチング素子に電力を供給する出力巻線（以下、１次補助巻線と呼ぶ）、８ａおよび８ｂは分割コイルボビン、１１は各巻線間の絶縁テープ、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、分割コイルボビン８ａに１次主巻線１、２次主巻線７、１次補助巻線２の順に各巻線間を厚さが２５μｍまたは５０μｍのポリエチレンテレフタレートの絶縁テープ１１を介して巻装し、４個の巻溝９を有する分割コイルボビン８ｂの１番目の巻溝９ａに２次補助巻線３、２番目の巻溝９ｂに２次補助巻線４、３番目の巻溝９ｃに２次補助巻線５、４番目の巻溝９ｄに２次補助巻線６をそれぞれ巻装し、分割コイルボビン８ａと分割コイルボビン８ｂを嵌合し、フェライトコアからなる磁芯１０を通した構成とするものである。
【０００７】
【発明が解決しようとする課題】
しかしながら、以上のコンバータトランスの構成では、次のような課題がある。
【０００８】
（１）分割コイルボビン８ａと分割コイルボビン８ｂの２個のボビンが必要であり、１次主巻線１、２次主巻線７と１次補助巻線２をそれぞれ絶縁するために絶縁テープ１１を使用するため部品点数も多く材料費が高くなる。
【０００９】
（２）また、分割コイルボビン８ａと分割コイルボビン８ｂの２個のボビンを嵌合する工程が必要となり組立工程が増えコストアップになる。
【００１０】
（３）１次主巻線１、２次主巻線７と１次補助巻線２をそれぞれ絶縁するための絶縁テープ１１は２５μｍまたは５０μｍと非常に薄いため巻き乱れ、巻き崩れが発生しやすく巻線の歩留まりが悪くなる。また、１次主巻線１、２次主巻線７と１次補助巻線２の巻線位置がばらつくために２次主巻線７、２次補助巻線３，４，５，６の出力電圧、レギュレーション特性が悪化する。
【００１１】
本発明は上記課題を解決するもので、低コストで高結合、出力電圧特性が良く、かつ、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。
【００１２】
【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、巻溝は少なくとも３つ設け、中央の巻溝に１次主巻線を巻装し、１次主巻線の外周に２次主巻線と１次補助巻線を順に巻装しており、中央の巻溝の両サイドの巻溝に２次補助巻線を巻装した構成にしたものである。
【００１３】
【作用】
この構成によって、従来２個のコイルボビンで構成していたものを１個のコイルボビンにすることができ、１次主巻線と２次主巻線および１次補助巻線間を絶縁していたポリエチレンテレフタレートの絶縁テープも削除できて部品点数の削減、工数低減ができる。
【００１４】
また、１次主巻線及び２次主巻線と２次補助巻線との結合を低くすることができるため、２次主巻線出力の負荷が変動しても２次補助巻線の出力電圧の変動を小さくできる効果を有するものである。
【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である第１の実施例を図１および図２により説明する。
【００１６】
３個の巻溝９を有するコイルボビン８に１次主巻線１をコイルボビン８の２番目の中央の巻溝９ｂに巻装し、多層の絶縁物から成る電線を用いた主出力である２次主巻線７を１次主巻線１の上に巻装し、さらに１次補助巻線２を２次主巻線７の上に巻装する。
【００１７】
さらに、１番目の巻溝９ａに補助出力の２次補助巻線３，４を、３番目の巻溝９ｃには補助出力の２次補助巻線５，６を巻装し、フェライトコアからなる磁芯１０を組込んで構成するものである。
【００１８】
この実施例によれば、主出力である２次主巻線７に多層の絶縁物から成る電線を用いることにより各巻線間の絶縁に用いていたポリエチレンテレフタレートの粘着テープを削除できるため、部品点数削減、工数低減によるコストダウン、さらに絶縁テープの巻き乱れによる巻線の巻き乱れが起きないため、安定した出力電圧レギュレーション特性を得ることができるものである。
【００１９】
（実施例２）
以下、第２の実施例を図３、図４により説明する。
【００２０】
３個の巻溝９を有するコイルボビン８に１次主巻線１をコイルボビン８の２番目の中央の巻溝９ｂに巻装し、多層の絶縁物から成る電線を用いた主出力である２次主巻線７を１次主巻線１の上に巻装し、１次補助巻線２を２次主巻線７の上に巻装し、また、１番目の巻溝９ａに２次主巻線７より電力の小さい補助出力の２次補助巻線３，４を、３番目の巻溝９ｃにも２次主巻線７より電力の小さい補助出力の２次補助巻線５，６を巻装し、フェライトコアからなる磁芯１０を組込んで構成するものである。
【００２１】
この実施例によれば、２次主巻線７より電力の小さい補助出力の２次補助巻線３，４，５，６を１次主巻線１と２次主巻線７の巻装されている中央の巻溝９ｂの両サイドの巻溝９ａ，９ｃに巻装する構成により、２次補助巻線３，４，５，６と１次巻線との対向距離が大きくなることによって結合が低くなり、主出力の負荷が変動しても２次補助巻線３，４，５，６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ものである。
【００２２】
（実施例３）
以下、第３の実施例を図５、図６により説明する。
【００２３】
３個の巻溝９を有するコイルボビン８に１次主巻線１をコイルボビン８の２番目の中央の巻溝９ｂに巻装し、多層の絶縁物から成る電線を用いた主出力である２次主巻線７を１次主巻線１の上に巻装し、さらに１次補助巻線２を２次主巻線７の上に巻装し、１番目の巻溝９ａに２次主巻線７より電力の小さい補助出力の２次補助巻線３および多層の絶縁物から成る電線を用いた２次補助巻線４（多層の絶縁物から成る電線を用いるのは２次補助巻線３でもよい）をそれぞれ巻装し、その３番目の巻溝９ｃにも２次主巻線７より電力の小さい補助出力の２次補助巻線５および多層の絶縁物から成る電線を用いた２次補助巻線６（多層の絶縁物から成る電線を用いるのは２次補助巻線５でもよい）をそれぞれ巻装し、フェライトコアからなる磁芯１０を組込んで構成するものである。
【００２４】
この実施例によれば、補助出力の２次補助巻線３、２次補助巻線４間および２次補助巻線５、２次補助巻線６間の絶縁は一方が多層の絶縁部から成る電線で構成していることにより、巻線間の絶縁を絶縁テープ、コイルボビン等を使用することなく高い信頼性で実現できるというものである。
【００２５】
（実施例４）
以下、第４の実施例を図７、図８により説明する。
【００２６】
５個の巻溝９を有するコイルボビン８に１次主巻線１をコイルボビン８の３番目の中央の巻溝９ｃに巻装し、多層の絶縁物から成る電線を用いた主出力である２次主巻線７を１次主巻線１の上に巻装し、さらに１次補助巻線２を２次主巻線７の上に巻装し、２次主巻線７より電力の小さい補助出力の２次補助巻線３は巻溝９ｂ、２次補助巻線４は巻溝９ａ、２次補助巻線５は巻溝９ｅ、２次補助巻線６は巻溝９ｄにそれぞれ巻装し、フェライトコアから成る磁芯１０を組込んで構成するものである。
【００２７】
この実施例によれば、補助出力の２次補助巻線３、２次補助巻線４間および２次補助巻線５、２次巻線をコイルボビン８にて分割する構成にしていることにより、２次補助巻線の中でも電力の大きい２次補助巻線を１次主巻線１と隣合う巻溝に巻回することにより、他の２次補助巻線より１次主巻線１との結合が高くなり電力を多くとることによって起こる電圧降下を防止することができるという効果が得られるものである。
【００２８】
【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、巻溝は少なくとも３つ設け、中央の巻溝に１次主巻線を巻装し、１次主巻線の外周に２次主巻線と１次補助巻線を順に巻装しており、中央の巻溝の両サイドの巻溝に２次補助巻線を巻装した構成にすることにより、
（１）ポリエチレンテレフタレートの絶縁テープの巻き乱れによる巻線の巻き乱れが起きないため安定した出力電圧レギュレーション特性を得ることができる。そして、１次主巻線及び２次主巻線と２次補助巻線との結合を低くすることができ、主出力の負荷が変動しても２次補助巻線の出力電圧の変動を小さくできるものである。
【００２９】
また、中央の巻溝の両サイドにそれぞれ巻溝を複数個設け多数ある２次補助巻線の中でも電力の大きい２次補助巻線を１次主巻線に近い巻溝に巻装したものにあっては、
（２）他の２次補助巻線より１次主巻線と結合が高くなり、電力を多くとることによって起こる電圧降下を防止することができるものである。
【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第１の実施例の要部の断面図
【図２】同巻線の結線図
【図３】同第２の実施例の要部の断面図
【図４】同図３の巻線の結線図
【図５】同第３の実施例の要部の断面図
【図６】同図５の巻線の結線図
【図７】同第４の実施例の要部の断面図
【図８】同図７の巻線の結線図
【図９】従来のコンバータトランスの要部の断面図
【図１０】同巻線の結線図
【符号の説明】
１１次主巻線
２１次補助巻線
３〜６２次補助巻線
７２次主巻線
８コイルボビン
９，９ａ〜９ｅ巻溝
１０磁芯[0001]
[Industrial applications]
The present invention relates to a converter transformer used for a switching power supply incorporated in various motor control devices such as an inverter air conditioner and a general-purpose inverter power supply.
[0002]
[Prior art]
In recent years, it has become an important issue for switching power supplies incorporated in various motor control devices that low cost, high performance, and high stability are required.
[0003]
In order to solve this problem, it is very important to develop a converter transformer that can realize low cost, high performance and high stability.
[0004]
Hereinafter, a conventional converter transformer will be described with reference to FIGS.
[0005]
According to the figure, reference numeral 1 denotes an input winding of a primary-side power supply (hereinafter referred to as a primary main winding), and reference numerals 3, 4, 5, 6, and 7 denote output windings for supplying power to a secondary-side load. There is a main secondary winding 7 for supplying a large power to the secondary side (hereinafter referred to as a secondary main winding), and 3, 4, 5 and 6 for supplying a small power to the secondary load. An auxiliary secondary winding (hereinafter, referred to as a secondary auxiliary winding). Reference numeral 2 denotes an output winding for supplying power to the primary-side switching element (hereinafter, referred to as a primary auxiliary winding); 8a and 8b, split coil bobbins; 11, an insulating tape between the windings; It is a magnetic core consisting of
[0006]
A converter transformer of this type includes a polyethylene terephthalate insulating tape 11 having a thickness of 25 μm or 50 μm between windings on a split coil bobbin 8 a in the order of a primary main winding 1, a secondary main winding 7, and a primary auxiliary winding 2. And a secondary auxiliary winding 3 in the first winding groove 9a of the divided coil bobbin 8b having four winding grooves 9, a secondary auxiliary winding 4 in the second winding groove 9b, and a third auxiliary winding. The secondary auxiliary winding 5 is wound around the winding groove 9c, and the secondary auxiliary winding 6 is wound around the fourth winding groove 9d, and the split coil bobbin 8a and the split coil bobbin 8b are fitted. This is a configuration that has passed through.
[0007]
[Problems to be solved by the invention]
However, the above configuration of the converter transformer has the following problems.
[0008]
(1) Two bobbins, a split coil bobbin 8a and a split coil bobbin 8b, are required, and an insulating tape 11 is used to insulate the primary main winding 1, the secondary main winding 7 and the primary auxiliary winding 2 respectively. Since it is used, the number of parts is large and the material cost is high.
[0009]
(2) In addition, a step of fitting two bobbins, the split coil bobbin 8a and the split coil bobbin 8b, is required, which increases the number of assembling steps and increases the cost.
[0010]
(3) Since the insulating tape 11 for insulating the primary main winding 1, the secondary main winding 7 and the primary auxiliary winding 2 is very thin, 25 μm or 50 μm, turbulence and unwinding easily occur. The yield of the winding becomes poor. Also, since the winding positions of the primary main winding 1, the secondary main winding 7 and the primary auxiliary winding 2 vary, the secondary main winding 7, the secondary auxiliary windings 3, 4, 5, 6 Output voltage and regulation characteristics deteriorate.
[0011]
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 with low cost, high coupling, good output voltage characteristics.
[0012]
[Means for Solving the Problems]
In order to solve this problem, according to the present invention, at least three winding grooves are provided, a primary main winding is wound around a central winding groove, and a secondary main winding and a primary winding are arranged around the outer periphery of the primary main winding. The auxiliary winding is wound in order, and the secondary auxiliary winding is wound around the winding groove on both sides of the center winding groove.
[0013]
[Action]
According to this configuration, the conventional structure composed of two coil bobbins can be replaced with one coil bobbin, and the polyethylene that insulates the primary main winding from the secondary main winding and the primary auxiliary winding is provided. The insulating tape of terephthalate can also be eliminated, which reduces the number of parts and man-hours.
[0014]
Further, since the coupling between the primary main winding and the secondary main winding and the secondary auxiliary winding can be reduced, the output of the secondary auxiliary winding can be changed even if the load of the output of the secondary main winding fluctuates. This has the effect of reducing voltage fluctuations.
[0015]
【Example】
(Example 1)
Hereinafter, a first embodiment which is an embodiment of the converter transformer of the present invention will be described with reference to FIGS.
[0016]
The primary main winding 1 is wound around a coil bobbin 8 having three winding grooves 9 in a second central winding groove 9b of the coil bobbin 8, and a secondary output which is a main output using an electric wire made of a multilayer insulating material. The main winding 7 is wound on the primary main winding 1, and the primary auxiliary winding 2 is wound on the secondary main winding 7.
[0017]
Furthermore, secondary auxiliary windings 3 and 4 of auxiliary output are wound around the first winding groove 9a, and secondary auxiliary windings 5 and 6 of auxiliary output are wound around the third winding groove 9c, and are made of a ferrite core. It is configured by incorporating the magnetic core 10.
[0018]
According to this embodiment, since the secondary main winding 7, which is the main output, is made of a multilayered electric wire, the polyethylene terephthalate adhesive tape used for insulation between the windings can be eliminated. Since the winding is not disturbed by the reduction in the number of steps and the man-hour, and the winding of the insulating tape is not disturbed, a stable output voltage regulation characteristic can be obtained.
[0019]
(Example 2)
Hereinafter, a second embodiment will be described with reference to FIGS.
[0020]
The primary main winding 1 is wound around a coil bobbin 8 having three winding grooves 9 in a second central winding groove 9b of the coil bobbin 8, and a secondary output which is a main output using an electric wire made of a multilayer insulating material. The main winding 7 is wound on the primary main winding 1, the primary auxiliary winding 2 is wound on the secondary main winding 7, and the secondary winding 9a is wound on the first winding groove 9a. The secondary auxiliary windings 3 and 4 having an auxiliary output smaller in electric power than the winding 7 and the secondary auxiliary windings 5 and 6 having an auxiliary output smaller in electric power than the secondary main winding 7 are also provided in the third winding groove 9c. It is configured by winding and incorporating a magnetic core 10 made of a ferrite core.
[0021]
According to this embodiment, the secondary auxiliary windings 3, 4, 5, and 6 having auxiliary outputs smaller in power than the secondary main winding 7 are wound around the primary main winding 1 and the secondary main winding 7. The windings 9a and 9c on both sides of the center winding groove 9b are wound around the secondary windings 3, 4, 5, 6 and the primary winding so that the opposing distance is increased. And the fluctuation of the output voltage of the secondary auxiliary windings 3, 4, 5, 6 can be reduced even if the load of the main output fluctuates.
[0022]
(Example 3)
Hereinafter, a third embodiment will be described with reference to FIGS.
[0023]
The primary main winding 1 is wound around a coil bobbin 8 having three winding grooves 9 in a second central winding groove 9b of the coil bobbin 8, and a secondary output which is a main output using an electric wire made of a multilayer insulating material. The main winding 7 is wound on the primary main winding 1, the primary auxiliary winding 2 is wound on the secondary main winding 7, and the secondary main winding is wound in the first winding groove 9a. A secondary auxiliary winding 3 having an auxiliary output smaller than the power of the wire 7 and a secondary auxiliary winding 4 using an electric wire made of multilayer insulation (an electric wire made of multilayer insulation is used for the secondary auxiliary winding 3) And the third winding groove 9c is also provided with a secondary auxiliary winding 5 having an auxiliary output smaller in electric power than the secondary main winding 7 and a secondary wire using a multilayer insulating material. Auxiliary windings 6 (a secondary auxiliary winding 5 may be used if an electric wire made of a multi-layered insulator is used), and a magnetic core made of a ferrite core And it constitutes incorporates a 0.
[0024]
According to this embodiment, the insulation between the secondary auxiliary windings 3 and the secondary auxiliary windings 4 of the auxiliary output and between the secondary auxiliary windings 5 and the secondary auxiliary windings 6 is composed of a multilayer insulating part. By using an electric wire, insulation between windings can be realized with high reliability without using an insulating tape, a coil bobbin, or the like.
[0025]
(Example 4)
Hereinafter, a fourth embodiment will be described with reference to FIGS.
[0026]
The primary main winding 1 is wound around a coil bobbin 8 having five winding grooves 9 in a third central winding groove 9c of the coil bobbin 8, and a secondary output which is a main output using an electric wire made of a multilayered insulator is provided. The main winding 7 is wound on the primary main winding 1 and the primary auxiliary winding 2 is wound on the secondary main winding 7. The output secondary auxiliary winding 3 is wound around the winding groove 9b, the secondary auxiliary winding 4 is wound around the winding groove 9a, the secondary auxiliary winding 5 is wound around the winding groove 9e, and the secondary auxiliary winding 6 is wound around the winding groove 9d. And a magnetic core 10 made of a ferrite core.
[0027]
According to this embodiment, the auxiliary output is divided between the secondary auxiliary winding 3 and the secondary auxiliary winding 4 and between the secondary auxiliary winding 5 and the secondary winding by the coil bobbin 8. By winding a secondary auxiliary winding having a large electric power among the secondary auxiliary windings in a winding groove adjacent to the primary main winding 1, the secondary auxiliary winding is connected to the primary main winding 1 more than other secondary auxiliary windings. The effect is obtained that the voltage drop caused by increasing the coupling and taking more power can be prevented.
[0028]
【The invention's effect】
As described above, in the converter transformer of the present invention, at least three winding grooves are provided, the primary main winding is wound around the central winding groove, and the secondary main winding and the primary main winding are arranged around the outer periphery of the primary main winding. Auxiliary windings are wound in order, and a secondary auxiliary winding is wound around both sides of the center winding groove.
(1) Stable output voltage regulation characteristics can be obtained because winding disturbance is not caused by winding disturbance of the insulating tape of polyethylene terephthalate. Further, the coupling between the primary main winding and the secondary main winding and the secondary auxiliary winding can be reduced, so that the fluctuation of the output voltage of the secondary auxiliary winding can be reduced even if the load of the main output changes. You can do it.
[0029]
Which Also, wound around the large secondary auxiliary winding of the power among the secondary auxiliary winding in each number provided a plurality of winding grooves on both sides of the central winding groove to the winding groove close to the primary main winding In
(2) The coupling with the primary main winding is higher than the other secondary auxiliary windings, so that a voltage drop caused by taking more power can be prevented.
[Brief description of the drawings]
FIG. 1 is a sectional view of a main part of a first embodiment which is an embodiment of a converter transformer according to the present invention. FIG. 2 is a connection diagram of the same winding. FIG. FIG. 4 is a cross-sectional view of a main part of the third embodiment. FIG. 6 is a cross-sectional view of a main part of the third embodiment. FIG. 6 is a cross-sectional view of a winding of FIG. FIG. 8 is a cross-sectional view of a main part of the embodiment of FIG. 7; FIG. 9 is a cross-sectional view of a main part of a conventional converter transformer; FIG. Description】
DESCRIPTION OF SYMBOLS 1 Primary main winding 2 Primary auxiliary winding 3-6 Secondary auxiliary winding 7 Secondary main winding 8 Coil bobbin 9, 9a-9e Winding groove 10 Magnetic core

Claims

A magnetic core, a coil bobbin incorporated in the magnetic core and provided with a plurality of winding grooves, a primary main winding connected to a primary power supply wound on the coil bobbin, and connected to a high-power load on a secondary side And a secondary auxiliary winding connected to a low-power load on the secondary side, and a primary auxiliary winding connected to a switching element on the primary side. In the converter transformer, one of the secondary main winding, the secondary auxiliary winding, and the primary auxiliary winding, each of which is wound adjacently and formed of an electric wire made of a multilayer insulator, At least three grooves are provided, and the primary main winding is wound around the center winding groove, and the secondary main winding and the primary auxiliary winding are sequentially wound around the outer periphery of the primary main winding. and which, converter Trang wound around the second auxiliary winding on the winding grooves on both sides of the center of the winding groove .

2. The secondary auxiliary winding having a higher electric power among the secondary auxiliary windings is wound around a winding groove close to the primary main winding, and a plurality of winding grooves on both sides of the central winding groove are provided. Converter transformer.