JP2004201458A

JP2004201458A - Transformer for multiple-output power supply

Info

Publication number: JP2004201458A
Application number: JP2002369380A
Authority: JP
Inventors: Hideki Kojima; 秀樹小島
Original assignee: Toko Inc
Current assignee: Toko Inc
Priority date: 2002-12-20
Filing date: 2002-12-20
Publication date: 2004-07-15
Anticipated expiration: 2022-12-20
Also published as: JP3643581B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer for multiple-output power supply wherein the output voltage/current characteristics are provided with a drooping characteristic and necessity for an overcurrent protection circuit is obviated. <P>SOLUTION: The transformer is for a multiple-output power supply. The transformer comprises a non-contact power supply which is provided with a primary coil for supplying power and a secondary coil for receiving power and transmits power with the primary coil, and the secondary coil opposed to each other; and a power supply which obtains a plurality of direct-current output voltages from a tertiary coil provided coaxially with the winding axis of the primary coil. The transformer comprises the primary coil, secondary coil, and tertiary coil. The windings of the primary coil and the tertiary coil are wound on the same core shaft. The winding of the secondary coil is wound on another core shaft. A partition plate made of the core material is provided between the primary coil and the tertiary coil. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】本発明は、非接触で電力を供給する電源装置と複数の直流出力電圧とを同時に得られるマルチ出力電源装置に用いるトランスに関する。
【０００２】
【従来の技術】
【特許文献１】特開平９−１２１４８１号公報
【特許文献２】特開平６−１６９５６６号公報
【０００３】
例えば、コードレス電話装置のように、子機はコードレスで親機から非接触で二次電池を充電する充電電池を備え、親機は子機に電力を供給する電源を備えるとともに、複数の回路に応じた直流電源を出力できるマルチ出力電源装置が用いられている。（例えば、特許文献１参照）
【０００４】
部品点数が少なく、回路構成が簡単な自励発振型のマルチ出力電源装置の概略回路図を図５に示す。
図５に示すように、電力を供給する一次側は商用交流電源（ＡＣ１００Ｖ５０／６０Ｈｚ）から整流平滑回路を介して直流電圧を得る。その直流電圧を自励発振回路によりスイッチング素子をオンオフさせて、一次コイルＬ１に発生したエネルギーを、一次コイルＬ１と所定の間隔を隔てて対向させて配置した二次コイルＬ２に電力を供給し、非接触で出力端子ＣＮ２に所定の直流電圧を得る回路である。また、一次コイルＬ１のエネルギーを同じトランス内に設けられた三次コイルＬ３に伝え、出力端子ＣＮ３に所定の直流電圧を得る回路である。なお、回路図では、出力端子ＣＮ３は１出力であるが複数の出力を必要とする場合は三次コイルを複数設け、それぞれに応じた設定の直流電圧を得る。
【０００５】
このような構成のマルチ出力電源装置における従来のトランスを図６に示す。
図６に示すように、図６（ａ）は説明のための模式図であり、図２（ｂ）はその断面図である。
図６より、磁性材料から成る断面がＴ字状の一次側コア１に、巻線部１ｂに一次コイル３を卷回し、同じコア軸上に並べて、三次コイル４を卷回したものである。
二次コイルは磁性材料から成る断面がＩ字状の二次側コア９に二次コイル１０を卷回したものである。そして、一次側コア(一次コイルの巻線面を含む)面１ａと二次側コア(二次コイル巻線面を含む)面９ａが所定の間隔を置いて、対向した状態で二次コイル１０に電力を伝達する。
【０００６】
このようなトランスおける磁束の流れを図７に示す。
図７に示すとおり、一次コイル３で発生する磁束は一次側コアの面１ａから対向する二次側コア９、二次コイル２０を経て、一次側コアの鍔１ｃに入る磁束のループφ_１−２と、一次側コア１から一次側コアの面１ａを飛び出し鍔１ｃに入る磁束のループφ_１−３が考えられる。
これらは、一次コイル３と二次コイル４の結合係数ｋ_１−２と一次コイルと三次コイルの結合係数ｋ_１−３を測定することにより、一次コル、二次コイル、三次コイルの磁束の関係をあらわすことができる。
図６のトランスにおいて結合係数を測定した結果、一次コイルと二次コイルの結合係数Ｋ_１−２は０．２〜０．４であり、一次コイルと三次コイルの結合係数Ｋ_１−３は０．５〜０．８であった。
図５に示す回路図にこのトランスを用いた時、三次コイルの出力端子ＣＮ３の出力電圧電流特性は図４に示す曲線Ｂのようになった。
このような出力電圧電流特性では、外部負荷において短絡（ショート）した場合に過大な電流が流れ回路を焼損する恐れがある。これを防止するために保護回路を設けると回路が複雑となり大幅なコストアップとなる欠点があった。また、三次コイルに並列に共振コンデンサＣｏ（図５点線部）を挿入する方法があるが、一次コイルと三次コイルの結合係数ｋ_１−３が強くなりすぎて自励発振回路の発振が不安定となる。
【０００７】
【発明が解決しようとする課題】
本発明は以上のような従来の欠点に鑑み、三次コイルの出力電圧電流特性に垂下特性をもたせ、過電流保護回路を不要としたマルチ出力電源装置のトランスを提供することを目的としている。
【０００８】
【課題を解決するための手段】
上記目的を達成するために、本発明は、電力を供給する一次側コイルと電力を受電する二次側コイルを備え、一次側コイルと二次側コイルとを対向させて電力の伝達をおこなう非接触電源装置と、一次側コイルの巻線軸と同軸に設けた三次側コイルから複数の直流出力電圧を得る電源装置とを併せ持つマルチ出力電源装置のトランスにおいて、トランスは一次側コイル、二次側コイル、三次側コイルを具備している。一次側コイルと三次側コイルは同一のコア軸に巻線が卷回されている。二次側コイルは他のコア軸に巻線が卷回されている。そして、一次側コイルと三次側コイルとの間にコア材の仕切り板を設けた構成である。
【０００９】
【発明の実施の形態】
電力を供給する一次側コイルと電力を受け取る二次側コイルを備え、一次側コイルと二次側コイルとを対向させて電力の伝達を行なう非接触電源装置と、一次側コイルの巻線軸と同軸に設けた三次側コイルから複数の直流出力電圧を得る電源装置とを併せ持つマルチ出力電源装置のトランスにおいて、トランスは一次側コイル、二次側コイル、三次側コイルを具備している。
一次側コイルと三次側コイルは同一のコア軸に並べて巻線を卷回したり、または、一次側コイルと三次側コイルを同一のコア軸に重ねて巻線を卷回する。二次側コイルは他のコア軸に巻線を卷回する。一次側コイルと三次側コイルとの間にコア材の仕切り板を設けて磁気的結合を調整する。
仕切り板は一次側コイルと三次側コイルの結合係数を一次側コイルと二次側コイルの結合係数とほぼ同じ結合係数となるように所定の大きさとする。
または、一次側コアには、仕切り板を設けた形状のコアを一体にして形成したものを用いると部品点数を削減すると共に作業が容易となる。
【００１０】
【実施例】
本発明のマルチ出力電源装置のトランスの実施例を図１から図４を用いて説明する。
【００１１】
図１は一次コイルと二次コイルを巻線軸に並べて、磁気的結合を垂直方向に結合させたトランスで、図１（ａ）は説明のための模式図であり、図１（ｂ）はその断面図であり、図１（ｃ）は仕切り板の断面図である。
図１に示すように、トランスにおいて、１は磁性材料で断面がＴ字状に成型された一次側コア、２は磁性材料でリング状に成型された平板状の仕切り板、３は一次コイル、４は三次コイル、９は磁性材料で断面がＩ字状に成型された二次側コア、１０は二次コイルである。
【００１２】
仕切り板は一次コイルと三次コイルの結合係数ｋ_１−３が一次コイルと二次コイルの結合係数ｋ_１−２とほぼ同じになるようにコアを所定の大きさに設定したもので、その大きさは内径ｄ２を一次側コア１の巻線部径ｄ１とほぼ同じとし、外径ｗ２を一次側コア１の外径ｗ１とほぼ同じ（やや小さめ）とし、厚みｔを設けたものである。
なお、本願実施において一次コイルと三次コイルの結合係数ｋ_１−３を設定する際、仕切り板の外径ｗ２を変えると大きく結合が変わることより粗調整として予め行い、仕切り板の厚みｔで微調整行うことにより設定が容易に行なえる。なお、仕切り板の外径ｗ２を一次側コアの外形ｗ１より大きくすると、仕切り板２が出っ張ることになり、他の部品との接触およびトランスの配置に注意を要する。
また、一次側コアはコア１と仕切り板２を一体に形成したものでもよい。
【００１３】
このような構造のトランスの磁束の流れを図２に示す。
図２に示すように、一次コイル３で発生した磁束は一次側コア１から対向する二次側コア９、二次コイル１０を経て、一次コイル３と三次コイル４間に設けた仕切り板２を通るループφ_１−２を描く。また、一次コイルで発生した磁束φ１は二次側コア面９ａと対向する一次側コアの面１ａから飛び出し、仕切り板２に入る磁束のループと三次コイル４を通り一次側コアの鍔１ｃに入る磁束φ_１−３とが考えられる。
【００１４】
このように、磁性体の仕切り板２を設けることにより、一次コイル３で発生した磁束の一部は仕切り板２を通るループと三次コイル４を通るループφ_１−３に分かれる。いいかえれば、仕切り板の大きさ（ｗ２、ｔ）によって三次コイル４を通るループφ_１−３の磁束を調整することができる。
【００１５】
図５の回路において、三次コイルと並列に共振コンデンサＣｏ（点線部）を接続した共振型のマルチ出力電源装置に本願発明のトランスを用いて、三次コイルの出力端子ＣＮ３の出力電圧電流特性を測定した結果、図４の曲線Ａで示す特性を得た。
図４の曲線Ａに示すように垂下特性をもたせることができる。
このときの実施例である本願発明のトランスの各結合係数は、一次コイルと二次コイルの結合係数ｋ_１−２は０．２５〜０．３５で、一次コイル三次コイルの結合係数ｋ_１−３は０．２〜０．３であった。
【００１６】
このように、本発明のマルチ出力電源装置のトランスを用いることにより、
三次コイルの出力回路に保護回路が不要となり、コスト低減となる。また、三次コイルの出力端子ＣＮ３が電力制限されるため、無負荷時の２次側出力電圧が跳ね上がらず安全である。
【００１７】
次に、他の実施例であるマルチ出力電源装置のトランスを図３に示す。
図３は、一次コイルに二次コイルを重ねて卷回して高さを低く抑えた、磁気結合を水平方向に結合させたトランスで、図３（ａ）は説明のための模式図であり、図３（ｂ）はその断面図であり、図３（ｃ）は仕切り板の断面図である。
図３に示すように、トランスにおいて、１は磁性材料で断面がＥ字状に成型されたポット形の一次側コア、２は磁性材料で成型された筒状の仕切り板、３は一次コイル、４は三次コイル、９は磁性材料で断面がＩ字状に成型された二次側コア、１０は二次コイルである。
仕切り板２は一次コイルと三次コイルの結合係数Ｋ_１−３が一次コイルと二次コイルの結合係数ｋ_１−２より小さくなるように高さｈ２をコア１の脚１ｃと同じ高さｈ１寸法とし、厚みｔを所定の厚みに設定する。
なお、一次側コア１は仕切り板２を一体にして形成したものでもよい。
【００１８】
以上、本発明のマルチ出力電源装置のトランスの実施例を述べたが、これらの実施例に限られるものではない。例えば、コア形状を円筒で示したが、楕円、四角形、多角形を用いてもよい。一次コイル、二次コイル、三次コイルは予め巻線された空心コイルを用いてもよい。さらに、一次側コアと仕切り板の透磁率を異ならせた磁性材料を用いてもよい。さらに、自励型の共振回路を用いて説明したが他励の共振回路を用いても同様である。
【００１９】
【発明の効果】
以上の説明から明らかなように、本発明のマルチ出力電源装置のトランスは、一次コイルと三次コイルを同一のコア軸に巻線が卷回されており、一次コイルと三次コイルとの間に仕切り板を設け、一次コイルと三次コイルの結合を一次コイルと二次コイルの結合をほぼ同じにすることにより、三次コイルの出力端子の出力電圧電流特性に垂下特性を持たせている。それによって過電流を回避するため、複雑な過電流保護回路を必要としない安価なマルチ出力電源装置を提供することができる。
【図面の簡単な説明】
【図１】本発明の一実施例であるマルチ出力電源装置のトランスの模式図(ａ)とその断面図（ｂ）と仕切り板の断面図（ｃ）
【図２】図１に示したトランスの磁束の流れ図
【図３】本発明の他の実施例であるマルチ出力電源装置のトランスの模式図(ａ)とその断面図（ｂ）と仕切り板の断面図（ｃ）
【図４】三次側の出力端子の出力電圧電流特性図
【図５】マルチ出力電源装置の概略回路図
【図６】従来のマルチ出力電源装置のトランスの模式図(ａ)とその断面図（ｂ）
【図７】図６に示したトランスの磁束の流れ図
【符号の説明】
１一次側コア
２仕切り板
３一次コイル
４三次コイル
９二次側コア
１０二次コイル[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply for supplying electric power in a non-contact manner and a transformer used for a multi-output power supply capable of simultaneously obtaining a plurality of DC output voltages.
[0002]
[Prior art]
[Patent Document 1] Japanese Patent Application Laid-Open No. 9-121481 [Patent Document 2] Japanese Patent Application Laid-Open No. 6-169566
For example, like a cordless telephone device, the slave unit is provided with a charging battery that is cordless and charges a secondary battery from the master unit in a non-contact manner, and the master unit includes a power supply that supplies power to the slave unit and includes a plurality of circuits. A multi-output power supply device capable of outputting a corresponding DC power supply is used. (For example, see Patent Document 1)
[0004]
FIG. 5 is a schematic circuit diagram of a self-excited oscillation type multi-output power supply device having a small number of components and a simple circuit configuration.
As shown in FIG. 5, the primary side that supplies power obtains a DC voltage from a commercial AC power supply (100 VAC, 50/60 Hz) via a rectifying and smoothing circuit. The DC voltage is turned on and off by a self-excited oscillation circuit, and the energy generated in the primary coil L1 is supplied to a secondary coil L2 disposed opposite to the primary coil L1 at a predetermined interval, This is a circuit for obtaining a predetermined DC voltage at the output terminal CN2 in a non-contact manner. Further, the circuit transmits the energy of the primary coil L1 to the tertiary coil L3 provided in the same transformer, and obtains a predetermined DC voltage at the output terminal CN3. In the circuit diagram, the output terminal CN3 has one output, but when a plurality of outputs are required, a plurality of tertiary coils are provided, and a DC voltage set according to each is obtained.
[0005]
FIG. 6 shows a conventional transformer in such a multi-output power supply device.
As shown in FIG. 6, FIG. 6A is a schematic diagram for explanation, and FIG. 2B is a sectional view thereof.
As shown in FIG. 6, the primary coil 3 is wound around the winding portion 1b around the primary core 1 having a T-shaped section made of a magnetic material, and the tertiary coil 4 is wound around the same core axis.
The secondary coil is formed by winding a secondary coil 10 around a secondary core 9 made of a magnetic material and having an I-shaped cross section. Then, the primary coil (including the winding surface of the primary coil) surface 1a and the secondary core (including the winding surface of the secondary coil) surface 9a are spaced apart from each other by a predetermined distance. To transmit power.
[0006]
FIG. 7 shows the flow of magnetic flux in such a transformer.
As shown in FIG. 7, the magnetic flux generated in the primary coil 3 passes from the surface 1 a of the primary core, passes through the opposed secondary core 9 and the secondary coil 20, and enters a loop φ _{1-1 of the} magnetic flux entering the flange 1 c of the primary core. _2, the magnetic flux loop phi _1-3 of entering the flange 1c from the primary side core 1 jump out a surface 1a of the primary side core can be considered.
These, by measuring the primary coil 3 and the coupling coefficient k _1-2 and coupling coefficient k _1-3 of the primary coil and the tertiary coil of the secondary coil 4, primary Col secondary coil, the magnetic flux of the tertiary coil relations Can be represented.
Results of the measurement of the coupling coefficient in the transformer of FIG. 6, the coupling coefficient _{K 1-2} of the primary coil and the secondary coil is 0.2 to 0.4, the primary coil and coupling coefficient _{K 1-3} of the tertiary coil 0 0.5 to 0.8.
When this transformer is used in the circuit diagram shown in FIG. 5, the output voltage-current characteristic of the output terminal CN3 of the tertiary coil is as shown by a curve B shown in FIG.
In such an output voltage-current characteristic, when a short circuit occurs in an external load, an excessive current flows and the circuit may be burned. If a protection circuit is provided to prevent this, the circuit becomes complicated and there is a disadvantage that the cost is greatly increased. Further, the resonance in parallel with the tertiary coil capacitor Co there is a method of inserting a (FIG. 5 dotted line), unstable oscillation of the self-excited oscillation circuit becomes too strong coupling coefficient k _1-3 of the primary coil and tertiary coil It becomes.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described conventional drawbacks, and has as its object to provide a transformer of a multi-output power supply device in which the output voltage-current characteristics of a tertiary coil have drooping characteristics and an overcurrent protection circuit is not required.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes a primary coil for supplying electric power and a secondary coil for receiving electric power, and a non-electric power transmission device in which the primary coil and the secondary coil are opposed to each other to transmit electric power. In a transformer of a multi-output power supply device having a contact power supply device and a power supply device that obtains a plurality of DC output voltages from a tertiary coil provided coaxially with a winding axis of a primary coil, the transformer is a primary coil and a secondary coil. , A tertiary coil. The primary coil and the tertiary coil are wound around the same core shaft. The secondary coil has a winding wound around another core shaft. And it is the structure which provided the partition board of the core material between the primary side coil and the tertiary side coil.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
A non-contact power supply device that includes a primary coil that supplies power and a secondary coil that receives power, and transmits power by facing the primary coil and the secondary coil, and is coaxial with the winding axis of the primary coil. In the transformer of the multi-output power supply device having a power supply device for obtaining a plurality of DC output voltages from the tertiary coil provided in the above, the transformer includes a primary coil, a secondary coil, and a tertiary coil.
The primary side coil and the tertiary side coil are arranged side by side on the same core axis and the winding is wound, or the primary side coil and the tertiary side coil are superposed on the same core axis and the winding is wound. The secondary coil winds a winding around another core shaft. A magnetic core is adjusted by providing a partition plate made of a core material between the primary coil and the tertiary coil.
The partition plate has a predetermined size such that the coupling coefficient between the primary coil and the tertiary coil is substantially the same as the coupling coefficient between the primary coil and the secondary coil.
Alternatively, if a core formed integrally with a core having a partition plate is used as the primary side core, the number of components is reduced and the work is facilitated.
[0010]
【Example】
An embodiment of the transformer of the multi-output power supply device of the present invention will be described with reference to FIGS.
[0011]
FIG. 1 shows a transformer in which a primary coil and a secondary coil are arranged on a winding axis and a magnetic coupling is vertically coupled. FIG. 1A is a schematic diagram for explanation, and FIG. FIG. 1C is a cross-sectional view of the partition plate.
As shown in FIG. 1, in the transformer, 1 is a primary core formed of a magnetic material in a T-shaped cross section, 2 is a flat partition plate formed of a magnetic material in a ring shape, 3 is a primary coil, Reference numeral 4 denotes a tertiary coil, 9 denotes a secondary core made of a magnetic material and has an I-shaped cross section, and 10 denotes a secondary coil.
[0012]
The partition plate has a core set to a predetermined size such that the coupling coefficient k _1-3 between the primary coil and the tertiary coil is substantially the same as the coupling coefficient k _1-2 between the primary coil and the secondary coil. The inner diameter d2 is substantially the same as the winding diameter d1 of the primary core 1, the outer diameter w2 is substantially the same as (slightly smaller than) the outer diameter w1 of the primary core 1, and the thickness t is provided.
Incidentally, when setting the coupling coefficient k _1-3 of the primary coil and the tertiary coil in the present application embodiment, performed in advance as coarse than to increase binding changing the outer diameter w2 of the partition plate is changed, the fine in the thickness of the partition plate t Setting can be easily performed by performing adjustment. If the outer diameter w2 of the partition plate is larger than the outer diameter w1 of the primary core, the partition plate 2 will protrude, and attention must be paid to contact with other components and arrangement of the transformer.
Further, the primary side core may be one in which the core 1 and the partition plate 2 are integrally formed.
[0013]
FIG. 2 shows the flow of the magnetic flux of the transformer having such a structure.
As shown in FIG. 2, the magnetic flux generated in the primary coil 3 passes through the secondary core 9 and the secondary coil 10 from the primary core 1 to the partition plate 2 provided between the primary coil 3 and the tertiary coil 4. draw a loop φ _1-2 through. Further, the magnetic flux φ1 generated by the primary coil jumps out of the primary core surface 1a facing the secondary core surface 9a, passes through the loop of the magnetic flux entering the partition plate 2 and the tertiary coil 4, and enters the primary core flange 1c. The magnetic flux φ _1-3 can be considered.
[0014]
Thus, by providing the partition plate 2 of the magnetic body, a part of the magnetic flux generated by the primary coil 3 is divided into a loop phi _1-3 through the loop and tertiary coil 4 through the partition plate 2. In other words, it is possible to adjust the magnetic flux loop phi _1-3 through the tertiary coil 4 by the size (w2, t) of the partition plate.
[0015]
In the circuit of FIG. 5, the output voltage-current characteristic of the output terminal CN3 of the tertiary coil is measured using the transformer of the present invention in a resonance type multi-output power supply device in which a resonance capacitor Co (dotted line) is connected in parallel with the tertiary coil. As a result, the characteristic shown by the curve A in FIG. 4 was obtained.
As shown by the curve A in FIG. 4, a drooping characteristic can be provided.
Each coupling coefficient of the transformer of the present invention is an example of this case, the coupling coefficient k _1-2 of the primary coil and the secondary coil is 0.25-0.35, the coupling coefficient of the primary coil tertiary coil k _{1- 3} was 0.2-0.3.
[0016]
Thus, by using the transformer of the multi-output power supply device of the present invention,
The protection circuit is not required in the output circuit of the tertiary coil, and the cost is reduced. In addition, since the power of the output terminal CN3 of the tertiary coil is limited, the output voltage on the secondary side during no-load does not jump up and is safe.
[0017]
Next, FIG. 3 shows a transformer of a multi-output power supply device according to another embodiment.
FIG. 3 shows a transformer in which a secondary coil is superposed and wound on a primary coil to keep the height low, and magnetic coupling is coupled in the horizontal direction. FIG. 3 (a) is a schematic diagram for explanation. FIG. 3B is a cross-sectional view thereof, and FIG. 3C is a cross-sectional view of a partition plate.
As shown in FIG. 3, in the transformer, 1 is a pot-shaped primary core formed of a magnetic material in a cross section of an E-shape, 2 is a cylindrical partition plate formed of a magnetic material, 3 is a primary coil, Reference numeral 4 denotes a tertiary coil, 9 denotes a secondary core made of a magnetic material and has an I-shaped cross section, and 10 denotes a secondary coil.
Partitioning plate 2 is the primary coil and the same height h1 dimension the height h2 to be smaller than the coupling coefficient k _1-2 leg 1c of the core 1 of the coupling coefficient K _1-3 primary and secondary coils of the tertiary coil And the thickness t is set to a predetermined thickness.
In addition, the primary side core 1 may be formed by integrally forming the partition plate 2.
[0018]
Although the embodiments of the transformer of the multi-output power supply device of the present invention have been described above, the present invention is not limited to these embodiments. For example, although the core shape is shown as a cylinder, an ellipse, a square, or a polygon may be used. As the primary coil, the secondary coil, and the tertiary coil, an air-core coil wound in advance may be used. Further, a magnetic material having different magnetic permeability between the primary core and the partition plate may be used. Furthermore, the self-excited resonance circuit has been described, but the same applies to the use of a separately-excited resonance circuit.
[0019]
【The invention's effect】
As is apparent from the above description, the transformer of the multi-output power supply device of the present invention has a primary coil and a tertiary coil wound around the same core shaft, and a partition is provided between the primary coil and the tertiary coil. By providing a plate and making the coupling between the primary coil and the tertiary coil substantially the same as the coupling between the primary coil and the secondary coil, the output voltage / current characteristic of the output terminal of the tertiary coil has a drooping characteristic. Thus, an inexpensive multi-output power supply device that does not require a complicated overcurrent protection circuit to avoid overcurrent can be provided.
[Brief description of the drawings]
FIG. 1A is a schematic view of a transformer of a multi-output power supply device according to one embodiment of the present invention, FIG. 1B is a cross-sectional view thereof, and FIG.
FIG. 2 is a flow diagram of the magnetic flux of the transformer shown in FIG. 1. FIG. 3 is a schematic view (a) and a cross-sectional view (b) of a transformer of a multi-output power supply device according to another embodiment of the present invention. Sectional view (c)
FIG. 4 is an output voltage-current characteristic diagram of an output terminal on the tertiary side. FIG. 5 is a schematic circuit diagram of a multi-output power supply device. FIG. 6 is a schematic diagram (a) of a transformer of a conventional multi-output power supply device and a sectional view thereof. b)
7 is a flow chart of the magnetic flux of the transformer shown in FIG.
DESCRIPTION OF SYMBOLS 1 Primary core 2 Partition plate 3 Primary coil 4 Tertiary coil 9 Secondary core 10 Secondary coil

Claims

A non-contact power supply device comprising a primary coil for supplying power and a secondary coil for receiving power, and a non-contact power supply device for transmitting power by facing the primary coil and the secondary coil; and In a transformer of a multi-output power supply device having a power supply device for obtaining a plurality of DC output voltages from a secondary coil provided coaxially with a winding axis,
The transformer includes a primary coil, a secondary coil, and a tertiary coil,
The primary coil and the tertiary coil are wound around the same core axis, and the secondary coil is wound around another core axis.
A multi-output power supply transformer, wherein a partition plate made of a core material is provided between the primary coil and the tertiary coil.

A non-contact power supply device that includes a primary coil that supplies power and a secondary coil that receives power, and that transmits power by facing the primary coil and the secondary coil; and In a transformer of a multi-output power supply device having a power supply device for obtaining a plurality of DC output voltages from a secondary coil provided coaxially with a winding axis,
The transformer includes a primary coil, a secondary coil, and a tertiary coil,
The primary coil and the tertiary coil are wound around the same core axis,
The secondary side coil is wound around another core shaft,
A transformer for a multi-output power supply device, wherein a partition plate made of a core material is provided between the primary coil and the tertiary coil.

A non-contact power supply device that includes a primary coil that supplies power and a secondary coil that receives power, and that transmits power by facing the primary coil and the secondary coil; and In a transformer of a multi-output power supply device having a power supply device for obtaining a plurality of DC output voltages from a secondary coil provided coaxially with a winding axis,
The transformer includes a primary coil, a secondary coil, and a tertiary coil,
The primary coil and the tertiary coil are wound around the same core axis, and a winding is wound around the core coil. The secondary coil is wound around another core axis, and the primary coil and the tertiary coil are wound around the core coil. A transformer for a multi-output power supply device, wherein a partition plate made of a core material is provided between the transformer.

4. The transformer for a multi-output power supply device according to claim 1, wherein the core around which the primary coil and the tertiary coil are wound is formed by integrating a partition plate.

3. The partition plate according to claim 1, wherein the coupling coefficient between the primary side coil and the tertiary side coil has a predetermined size so as to be substantially equal to the coupling coefficient between the primary side coil and the secondary side coil. 5. The transformer of the multi-output power supply device according to claim 3, wherein: