JP2013138151A - Step-up transformer for high frequency heating apparatus - Google Patents

Step-up transformer for high frequency heating apparatus Download PDF

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JP2013138151A
JP2013138151A JP2011289256A JP2011289256A JP2013138151A JP 2013138151 A JP2013138151 A JP 2013138151A JP 2011289256 A JP2011289256 A JP 2011289256A JP 2011289256 A JP2011289256 A JP 2011289256A JP 2013138151 A JP2013138151 A JP 2013138151A
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transformer
winding
ferrite core
frequency heating
insulating member
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Shinichi Masuda
愼一 増田
Kenji Yahata
健志 八幡
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Sharp Corp
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Priority to PCT/JP2012/082302 priority patent/WO2013099622A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H01F27/325—Coil bobbins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/08—High-leakage transformers or inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a step-up transformer which can be made compact and lightweight as a whole while reducing the cost, by making a ferrite core compact and lightweight, and decreasing the number of turns of primary winding and secondary winding.SOLUTION: Ends 242c, 542c of ferrite cores 242, 542 are placed in the center hole of a bobbin shaped insulation member 252, and the tips of the ends 242c, 542c are connected with each other by a conductive adhesive 71. There is no gap in the central part 62 of the ferrite cores 242, 542 located in the center hole. The primary winding 20 and secondary winding 21 have winding widths W1, W2 smaller than the stacking thicknesses T1, T2 thereof, and have a flat winding shape.

Description

この発明は、高周波加熱装置用昇圧変圧器に関する。   The present invention relates to a step-up transformer for a high-frequency heating device.

電子レンジのような高周波加熱装置においては、商用交流電源を整流した直流電圧をインバータ回路によって高周波電圧に変換し、この高周波電圧を高周波加熱装置用昇圧変圧器で昇圧してマグネトロンに供給するようにしている。   In a high-frequency heating device such as a microwave oven, a DC voltage obtained by rectifying commercial AC power is converted into a high-frequency voltage by an inverter circuit, and this high-frequency voltage is boosted by a step-up transformer for the high-frequency heating device and supplied to the magnetron. ing.

従来、この種の高周波加熱装置用昇圧変圧器としては、特許第３７２６０１０号公報（特許文献１）に記載のものがある。   Conventionally, this kind of step-up transformer for a high-frequency heating device is described in Japanese Patent No. 3722010 (Patent Document 1).

この従来の高周波加熱装置用昇圧変圧器は、本願発明者等が発明したもので、大量に製造されており、好評を得ているものであり、中心孔を有するボビン形状の絶縁部材と、この絶縁部材の中心孔に挿入された中央部を有するフェライトコアと、上記絶縁部材に巻回され、その絶縁部材によって相互に絶縁される共に、巻線幅方向に互いに間隔をおいて対向するように、かつ、相互の結合係数が０．６５〜０．８になるように配された１次巻線および２次巻線とを備えている。そして、上記１次巻線および上記２次巻線のそれぞれの巻線幅が、上記１次巻線および上記２次巻線のそれぞれの重ね厚みより小さく、上記２次巻線が、分割されることなく１つのブロックとして形成されており、さらに、上記フェライトコアの中央部には、ギャップを設けている。   This conventional step-up transformer for a high-frequency heating device was invented by the inventors of the present application, has been mass-produced, has been well received, and has a bobbin-shaped insulating member having a center hole, A ferrite core having a central portion inserted in the central hole of the insulating member, and wound around the insulating member, insulated from each other by the insulating member, and opposed to each other at an interval in the winding width direction And a primary winding and a secondary winding arranged so that the mutual coupling coefficient is 0.65 to 0.8. And each winding width of the said primary winding and the said secondary winding is smaller than each overlap thickness of the said primary winding and the said secondary winding, and the said secondary winding is divided | segmented It is formed as one block without any gap, and a gap is provided in the central portion of the ferrite core.

上記従来の高周波加熱装置用昇圧変圧器は、上述のように、１次巻線および２次巻線のそれぞれの巻線幅が、１次巻線および２次巻線のそれぞれの重ね厚みより小さくて、１次巻線および２次巻線の形状が扁平であって、小型であるため、高周波加熱装置（構造が複雑な上に高電圧線が配線されている）の内部に、容易に取り付けることができる上に、上記フェライトコアの中央部にギャップを設けているため、磁気飽和を防止できて、過電流、スイッチング素子の破壊を防止できるという優れた利点を有する。   In the conventional step-up transformer for a high-frequency heating device, as described above, the winding widths of the primary winding and the secondary winding are smaller than the respective overlapping thicknesses of the primary winding and the secondary winding. Because the shape of the primary and secondary windings is flat and small, it can be easily installed inside a high-frequency heating device (having a complicated structure and high-voltage wires wired) In addition, since the gap is provided in the central portion of the ferrite core, the magnetic saturation can be prevented, and the overcurrent and the switching element can be prevented from being destroyed.

特許第３７２６０１０号公報Japanese Patent No. 3722010

しかしながら、上記従来の小型な高周波加熱装置用昇圧変圧器であっても、さらなる小型化とコストダウンをしなければならないという課題がある。特に、小型化、コストに大きく影響するコア、１次巻線および２次巻線の小型、軽量化に対する強い要請がある。   However, even the conventional small step-up transformer for a high-frequency heating device has a problem that it must be further reduced in size and cost. In particular, there is a strong demand for miniaturization and miniaturization and weight reduction of the core, primary winding and secondary winding, which greatly affect the cost.

そこで、本願発明者は、鋭意、特にコアの小型化、巻線の巻数の低減を検討した。高周波加熱装置では、優れた高周波特性と耐熱性が要求されるため、現在のフェライトコアを他の材料に代えることができない。現在のフェライトコアを珪素鋼板等の鉄系コア材料に代えると、鉄損が大きくなって高周波特性が悪くなり、また、メタルコンポジット材（金属磁性粉末と樹脂を混ぜて成形したもの）に代えると、耐熱性が悪くなるため、フェライトコアのままで、小型化することが必要である。   Therefore, the inventor of the present application has studied diligently, in particular, reducing the size of the core and reducing the number of windings. In a high-frequency heating device, excellent high-frequency characteristics and heat resistance are required, so that the current ferrite core cannot be replaced with other materials. If the current ferrite core is replaced with an iron-based core material such as a silicon steel plate, the iron loss will increase and the high-frequency characteristics will deteriorate, and if it is replaced with a metal composite material (molded by mixing metal magnetic powder and resin) Since heat resistance deteriorates, it is necessary to reduce the size of the ferrite core as it is.

そこで、本願発明者は、フェライトコアにおいては、フェライトコアの中央部に、磁気飽和を防止するために、当然にギャップを設けることが必須であるという当業者の常識を疑って、万に一つの可能性を考えて、上記従来の高周波加熱装置用昇圧変圧器のフェライトコアの中央部を連結して、ギャップを無くして、試みた。そうすると、当業者の予想に反して、磁気飽和が生じないことを発見した。   Therefore, the inventor of the present application suspects the common knowledge of those skilled in the art that it is essential to provide a gap in the ferrite core in order to prevent magnetic saturation at the center of the ferrite core. Considering the possibility, an attempt was made by connecting the central part of the ferrite core of the conventional step-up transformer for a high-frequency heating device to eliminate the gap. In doing so, it was discovered that no magnetic saturation occurred, contrary to the expectation of those skilled in the art.

その詳細な理由は、定かではないが、次のように、考えられる。図１１の模式図に示すように、巻線５０１，５０２を扁平にすると、巻線５０１，５０２の互いに対向する面積が大きくなって、コア５１１，５１２を通らずに、巻線５０１，５０２間で直接結合する矢印ＤＦで示す磁束が増えると考えられる。その結果、コア５１１，５１２を通る磁束の量が減少して、磁気飽和限界が高くなったと考えられる。なお、５２０は、一般的に考えられている磁路を示し、ＬＦは漏れ磁束を示している。   Although the detailed reason is not certain, it can be considered as follows. As shown in the schematic diagram of FIG. 11, when the windings 501 and 502 are flattened, the areas of the windings 501 and 502 facing each other increase, so that the windings 501 and 502 do not pass through the cores 511 and 512. It is considered that the magnetic flux indicated by the arrow DF that is directly coupled with increases in number. As a result, it is considered that the amount of magnetic flux passing through the cores 511 and 512 has decreased and the magnetic saturation limit has increased. Note that 520 indicates a generally considered magnetic path, and LF indicates a leakage magnetic flux.

上記理由によって、本願発明者等による扁平な構成の高周波加熱装置用昇圧変圧器によると、磁気飽和限界が非常に高くなっているため、ギャップが無くても、磁気飽和に至らなかったのであると考えられる。   For the above reasons, according to the step-up transformer for a high-frequency heating device having a flat configuration by the inventors of the present application, the magnetic saturation limit is very high, so that even if there was no gap, magnetic saturation was not reached. Conceivable.

この発明の高周波加熱装置用昇圧変圧器は、上記発見に基づいてなされたもので、
中心孔を有するボビン形状の絶縁部材と、
上記絶縁部材の中心孔内に配置された中央部を有するフェライトコアと、
上記絶縁部材に巻回され、その絶縁部材によって相互に絶縁される共に、巻線幅方向に互いに間隔をおいて対向するように、かつ、相互の結合係数が０．６５〜０．８になるように配された１次巻線および２次巻線と
を備え、
上記１次巻線および上記２次巻線のそれぞれの巻線幅が、上記１次巻線および上記２次巻線のそれぞれの重ね厚みより小さく、
上記２次巻線が、分割されることなく１つのブロックとして形成されており、
上記フェライトコアの中央部は連結していてギャップが無い
ことを特徴としている。 The step-up transformer for a high-frequency heating device of the present invention is made based on the above discovery,
A bobbin-shaped insulating member having a central hole;
A ferrite core having a central portion disposed in the central hole of the insulating member;
The coil is wound around the insulating member, insulated from each other by the insulating member, facing each other at an interval in the winding width direction, and the mutual coupling coefficient is 0.65 to 0.8. A primary winding and a secondary winding arranged as follows:
The respective winding widths of the primary winding and the secondary winding are smaller than the respective overlapping thicknesses of the primary winding and the secondary winding;
The secondary winding is formed as one block without being divided,
The central part of the ferrite core is connected and has no gap.

上記構成の高周波加熱装置用昇圧変圧器によれば、上記フェライトコアの中央部にギャップが無いから、ギャップがあるものに比べて、インダクタンス値が上がり、したがって、１次巻線および２次巻線の巻数を低減して、小型、軽量化およびコストダウンを達成できる。   According to the step-up transformer for a high-frequency heating device having the above-described configuration, since there is no gap in the central portion of the ferrite core, the inductance value is increased as compared with those having a gap, and therefore the primary winding and the secondary winding. It is possible to reduce the number of turns, and to achieve a reduction in size, weight and cost.

また、上記フェライトコアの中央部にギャップがある上記従来の高周波加熱装置用昇圧変圧器と、１次巻線および２次巻線の巻数を同じにした場合、この発明では、上記フェライトコアの中央部にギャップが無いから、フェライトコアの径を小さくしても、インダクタンス値を確保できて、フェライトコアを小型、軽量化できて、生産効率を向上でき、コストダウンを達成できる。   When the number of turns of the conventional step-up transformer for a high-frequency heating device having a gap at the center of the ferrite core is the same as that of the primary winding and the secondary winding, Since there is no gap in the part, even if the diameter of the ferrite core is reduced, the inductance value can be secured, the ferrite core can be reduced in size and weight, production efficiency can be improved, and cost reduction can be achieved.

１実施形態では、
上記フェライトコアの中央部のうちの隣接する２つの部分は、導電性接着剤で接続されている。 In one embodiment,
Two adjacent portions of the central portion of the ferrite core are connected by a conductive adhesive.

上記実施形態によれば、上記フェライトコアの中央部のうちの隣接する２つの部分は、導電性接着剤で接続されているから、中央部にギャップの無い一体構造のフェライトコアを、簡単、安価に製造できる。   According to the above embodiment, since two adjacent portions of the central portion of the ferrite core are connected by the conductive adhesive, a single-piece ferrite core having no gap in the central portion is simple and inexpensive. Can be manufactured.

１実施形態では、
上記フェライトコアの中央部のうちの隣接する２つの部分は、互いに当接している。 In one embodiment,
Two adjacent portions of the central portion of the ferrite core are in contact with each other.

上記実施形態によれば、上記フェライトコアの中央部のうちの隣接する２つの部分は、互いに当接しているから、簡単、安価に、中央部にギャップの無いフェライトコアを、簡単、安価に製造できる。   According to the above embodiment, since two adjacent portions of the central portion of the ferrite core are in contact with each other, a ferrite core having no gap in the central portion can be easily and inexpensively manufactured. it can.

１実施形態では、
上記フェライトコアは、インサート成形によって上記絶縁部材の中に埋め込まれている。 In one embodiment,
The ferrite core is embedded in the insulating member by insert molding.

上記実施形態によれば、上記フェライトコアは、インサート成形によって上記絶縁部材の中に埋め込まれているから、上記フェライトコアと上記絶縁部材が一体化されていて、取り扱いが容易になり、かつ、絶縁のための安全規格等の制約を受けなくすることができる。   According to the embodiment, since the ferrite core is embedded in the insulating member by insert molding, the ferrite core and the insulating member are integrated, handling becomes easy, and insulation is achieved. It is possible to eliminate the restrictions such as safety standards.

この発明によれば、１次巻線および２次巻線が扁平で、磁気飽和を防止できる上に、ボビン形状の絶縁部材の中心孔に配置されたフェライトコアの中央部にギャップが無いから、インダクタンス値が上がって、フェライトコアを小型、軽量化でき、かつ、１次巻線および２次巻線の巻数を低減して、小型、軽量化でき、コストダウンを達成できる。   According to this invention, the primary winding and the secondary winding are flat, magnetic saturation can be prevented, and there is no gap in the central portion of the ferrite core disposed in the central hole of the bobbin-shaped insulating member. The inductance value increases, the ferrite core can be reduced in size and weight, and the number of turns of the primary winding and the secondary winding can be reduced to reduce the size and weight, thereby achieving cost reduction.

この発明の実施形態１の昇圧変圧器の構造を示す断面図である。It is sectional drawing which shows the structure of the step-up transformer of Embodiment 1 of this invention. この発明の実施形態２の昇圧変圧器の構造を示す断面図である。It is sectional drawing which shows the structure of the step-up transformer of Embodiment 2 of this invention. この発明の実施形態３の昇圧変圧器の構造を示す断面図である。It is sectional drawing which shows the structure of the step-up transformer of Embodiment 3 of this invention. この発明の実施形態４の昇圧変圧器の構造を示す断面図である。It is sectional drawing which shows the structure of the step-up transformer of Embodiment 4 of this invention. この発明の実施形態５の昇圧変圧器の構造を示す断面図である。It is sectional drawing which shows the structure of the step-up transformer of Embodiment 5 of this invention. この発明の実施形態６の昇圧変圧器の構造を示す断面図である。It is sectional drawing which shows the structure of the step-up transformer of Embodiment 6 of this invention. この発明の実施形態７の昇圧変圧器の構造を示す断面図である。It is sectional drawing which shows the structure of the step-up transformer of Embodiment 7 of this invention. この発明の実施形態８の昇圧変圧器の構造を示す断面図である。It is sectional drawing which shows the structure of the step-up transformer of Embodiment 8 of this invention. この発明の実施形態９の昇圧変圧器の構造を示す断面図である。It is sectional drawing which shows the structure of the step-up transformer of Embodiment 9 of this invention. この発明の実施形態９の昇圧変圧器の概観構造を示す斜視図である。It is a perspective view which shows the general | schematic structure of the step-up transformer of Embodiment 9 of this invention. この発明の概念を示す模式図である。It is a schematic diagram which shows the concept of this invention.

以下、この発明を図示の実施形態により詳細に説明する。   Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

（実施形態１）
図１はこの発明の実施形態１の高周波加熱装置用昇圧変圧器の構造を示している。この昇圧変圧器は、図１に示すように、巻線は、１次巻線２０，２次巻線２１およびフィラメント巻線２３によって構成され、ボビン形状の絶縁部材２５に、絶縁部材２５の分割壁により互いに絶縁された状態で、巻回されている。 (Embodiment 1)
FIG. 1 shows the structure of a step-up transformer for a high-frequency heating device according to Embodiment 1 of the present invention. In this step-up transformer, as shown in FIG. 1, the winding is composed of a primary winding 20, a secondary winding 21 and a filament winding 23, and the insulating member 25 is divided into a bobbin-shaped insulating member 25. It is wound while being insulated from each other by walls.

この１次巻線２０，２次巻線２１を結合させるための磁性体として、２個のＵ字形のフェライトコア２４，５４の中央部となる部分２４ｃ，５４ｃが、絶縁部材２５の中心孔２５ｃ内に配置されている。上記部分２４ｃ，５４ｃの先端は、導電性接着剤７１によって互いに接続されて、上記フェライトコア２４，５４は一体構造になっている。上記部分２４ｃ，５４ｃは、一体構造のフェライトコア２４，５４の中央部６０を構成し、この中央部６０は、絶縁部材２５の中心孔２５ｃ内に位置する。上記部分２４ｃ，５４ｃは、中央部６０のうちの互いに隣接する部分２４ｃ，５４ｃであって、導電性接着剤７１によって互いに連結されていて、中央部６０には、ギャップが無い。   As magnetic bodies for coupling the primary winding 20 and the secondary winding 21, the portions 24 c and 54 c that are the central portions of the two U-shaped ferrite cores 24 and 54 are the center holes 25 c of the insulating member 25. Is placed inside. The tips of the portions 24c and 54c are connected to each other by a conductive adhesive 71, and the ferrite cores 24 and 54 have an integral structure. The portions 24 c and 54 c constitute a central portion 60 of the integrally formed ferrite cores 24 and 54, and the central portion 60 is located in the central hole 25 c of the insulating member 25. The portions 24c and 54c are adjacent portions 24c and 54c in the central portion 60 and are connected to each other by the conductive adhesive 71, and the central portion 60 has no gap.

上記１次巻線２０の巻線幅Ｗ１は、１次巻線２０の重ね厚みＴ１よりも小さくて、１次巻線２０の巻線形状としては扁平になっている。つまり、１次巻線２０は、Ｗ１＜Ｔ１として、好ましくは、Ｔ１の値がＷ１の値の１.２〜９倍、好ましくは１.５〜９倍になるようにしている。上記２次巻線２１の巻線幅Ｗ２と重ね厚みＴ２についても、１次巻線２１と同様のＷ２＜Ｔ２の関係となっている。   The winding width W1 of the primary winding 20 is smaller than the overlapping thickness T1 of the primary winding 20, and the primary winding 20 has a flat winding shape. That is, the primary winding 20 is preferably configured such that W1 <T1, and the value of T1 is 1.2 to 9 times, preferably 1.5 to 9 times the value of W1. The winding width W2 and the overlap thickness T2 of the secondary winding 21 also have the same relationship of W2 <T2 as the primary winding 21.

上記２次巻線２１においては、巻線幅Ｗ２を重ね厚みＴ２よりも短くしたことにより、従来のように２次巻線を絶縁部材で２〜３ブロックに分割する必要が無くなって、巻線を落ち込みにくくすることができる。その結果、昇圧変圧器の巻線形成工程における巻線の段落ちに起因して生じる絶縁破壊、つまり、段落ちした巻線に高電圧が印加されることによって生じる巻線の絶縁破壊を防止することができる。   In the secondary winding 21, since the winding width W2 is made shorter than the overlapped thickness T2, it is not necessary to divide the secondary winding into 2 to 3 blocks with an insulating member as in the prior art. Can be made difficult. As a result, it is possible to prevent dielectric breakdown caused by stepping of the winding in the step-up transformer winding forming process, that is, winding breakdown caused by applying a high voltage to the stepped winding. be able to.

また、この実施形態１では、上記２次巻線２１は、分割されることなく１つのブロックになっていて、上記絶縁部材２５の分割壁のうち、２次巻線２１を複数に分割する分割壁が無いから、その分だけ昇圧変圧器の高さＨを低くできる。すなわち、図１の昇圧変圧器は、巻線の総断面積を変えることなく、その高さＨが低くなっている。なお、上記絶縁部材２５は、１次巻線２０および２次巻線２１をそれぞれ収納する２つの空間と、これら２つの空間によって挟まれる位置に、上記２つの空間とは分割壁を隔てて形成される他の空間とを構成している。なお、２６は１次、２次巻線２０，２１とコア２４，５４との間の絶縁を確保するための絶縁材である。   In the first embodiment, the secondary winding 21 is divided into one block without being divided, and the division of the dividing wall of the insulating member 25 divides the secondary winding 21 into a plurality of divisions. Since there is no wall, the height H of the step-up transformer can be lowered accordingly. That is, the step-up transformer of FIG. 1 has a low height H without changing the total cross-sectional area of the winding. The insulating member 25 is formed in two spaces for accommodating the primary winding 20 and the secondary winding 21, respectively, and at a position sandwiched between the two spaces, with the two spaces being separated from each other. Constitutes the other space to be used. Reference numeral 26 denotes an insulating material for ensuring insulation between the primary and secondary windings 20 and 21 and the cores 24 and 54.

また、上記１次巻線２０および２次巻線２１の重ね厚みＴ１，Ｔ２が巻線幅Ｗ１，Ｗ２よりも大きくしているため、昇圧変圧器の高さ方向に配列されている１次巻線２０および２次巻線２１間の対向する面積が増加している。その結果、コア２４，５４を介さずに、１次、２次巻線２０，２１相互間での直接結合を大きくすることができ、コア２４，５４を通る磁束量を低減できる。また、上記１次巻線２０および２次巻線２１の相互の結合係数は、０．６５〜０．８としている。   Further, since the overlapping thicknesses T1 and T2 of the primary winding 20 and the secondary winding 21 are larger than the winding widths W1 and W2, the primary windings arranged in the height direction of the step-up transformer. The opposing area between the wire 20 and the secondary winding 21 has increased. As a result, the direct coupling between the primary and secondary windings 20 and 21 can be increased without using the cores 24 and 54, and the amount of magnetic flux passing through the cores 24 and 54 can be reduced. The mutual coupling coefficient between the primary winding 20 and the secondary winding 21 is set to 0.65 to 0.8.

この実施形態１の高周波加熱装置用昇圧変圧器によれば、上記フェライトコア２４，５４の中央部６０にギャップが無くても、磁気飽和が起こらないことが確認された。その理由としては、概念的には、次のように、考えられる。図１１の模式図に示すように、巻線５０１，５０２を扁平にすると、巻線５０１，５０２の互いに対向する面積が大きくなって、コア５１１，５１２を通らずに、巻線５０１，５０２間で直接結合する矢印ＤＦで示す磁束が増えると考えられる。その結果、コア５１１，５１２を通る磁束の量が減少して、磁気飽和限界が高くなったと考えられる。   According to the step-up transformer for the high-frequency heating device of the first embodiment, it was confirmed that magnetic saturation does not occur even if there is no gap in the central portion 60 of the ferrite cores 24 and 54. The reason can be conceptually as follows. As shown in the schematic diagram of FIG. 11, when the windings 501 and 502 are flattened, the areas of the windings 501 and 502 facing each other increase, so that the windings 501 and 502 do not pass through the cores 511 and 512. It is considered that the magnetic flux indicated by the arrow DF that is directly coupled with increases in number. As a result, it is considered that the amount of magnetic flux passing through the cores 511 and 512 has decreased and the magnetic saturation limit has increased.

また、上記フェライトコア２４，５４の中央部６０にギャップが無いから、ギャップがあるものに比べて、インダクタンス値が上がり、したがって、１次巻線２０および２次巻線２１の巻数を低減して、小型、軽量化およびコストダウンを達成できる。特に、１次巻線２０および２次巻線２１の材料である銅線は高価であり、かつ、重量が大きいから、巻数を低減することにより、コストダウンの大きな効果が得られ、軽量化の大きな効果が得られる。   Further, since there is no gap in the central portion 60 of the ferrite cores 24 and 54, the inductance value is increased as compared with those having a gap, and therefore the number of turns of the primary winding 20 and the secondary winding 21 is reduced. Small size, light weight and cost reduction can be achieved. In particular, the copper wire that is the material of the primary winding 20 and the secondary winding 21 is expensive and has a large weight. Therefore, by reducing the number of turns, a great effect of cost reduction can be obtained and the weight can be reduced. A big effect is acquired.

また、フェライトコアの中央部にギャップがある上記従来の高周波加熱装置用昇圧変圧器の１次巻線および２次巻線と、この実施形態の１次巻線２０および２次巻線２１の巻数を同じにした場合、この発明では、上記フェライトコア２４，５４の中央部６０にギャップが無いから、フェライトコアの２４，５４の中央部６０の径を小さくしても、インダクタンス値を確保できて、フェライトコア２４，５４を小型、軽量化できて、生産効率を向上でき、コストダウンを達成できる。   In addition, the number of turns of the primary winding and the secondary winding of the conventional step-up transformer for a high-frequency heating device having a gap at the center of the ferrite core, and the primary winding 20 and the secondary winding 21 of this embodiment In the present invention, since there is no gap in the central portion 60 of the ferrite cores 24 and 54, the inductance value can be secured even if the diameter of the central portion 60 of the ferrite cores 24 and 54 is reduced. The ferrite cores 24 and 54 can be reduced in size and weight, production efficiency can be improved, and cost reduction can be achieved.

（実施形態２）
図２に、この発明の実施形態２の昇圧変圧器の構造を示す。図２において、図１に示された実施形態１の構成要素と同一構成要素については、図１の構成要素と同一の参照番号を付して、詳しい説明は省略する。 (Embodiment 2)
FIG. 2 shows the structure of the step-up transformer according to the second embodiment of the present invention. 2, the same components as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals as those of FIG. 1, and detailed description thereof is omitted.

図２に示すように、ボビン形状の絶縁部材２５１の中心孔２５１ｃには、フェライトコア２４１，５４１の端部２４１ｃ，５４１ｃを配置し、この端部２４１ｃ，５４１ｃの先端を導電性接着剤７１によって互いに連結している。したがって、上記互いに連結された端部２４１ｃ，５４１ｃからなるフェライトコア２４１，５４１の中央部６１には、ギャップが無い。   As shown in FIG. 2, end portions 241 c and 541 c of ferrite cores 241 and 541 are arranged in the center hole 251 c of the bobbin-shaped insulating member 251, and the tips of the end portions 241 c and 541 c are connected by a conductive adhesive 71. Are connected to each other. Therefore, there is no gap in the central portion 61 of the ferrite cores 241 and 541 composed of the end portions 241c and 541c connected to each other.

この実施形態２においては、１次巻線２０および２次巻線２１を偏平にしたことによって、図２に示す矢印Ｅ部のフェライトコア２４１，５４１の磁気的な結合度合いが高くなっていることを利用して、フェライトコア２４１，５４１の腕から、絶縁部材２５１の外周部、すなわち、巻線が施された溝部の開放端への回り込みをなくしている。これにより、実施形態１における絶縁部材２６を不要とした上に、巻線を巻く前にフェライトコア２４１，５４１を絶縁部材２５１へ取り付けることができる。   In the second embodiment, since the primary winding 20 and the secondary winding 21 are flattened, the degree of magnetic coupling between the ferrite cores 241 and 541 in the arrow E part shown in FIG. 2 is increased. Is used to eliminate the wraparound from the arm of the ferrite cores 241 and 541 to the outer peripheral portion of the insulating member 251, that is, the open end of the groove portion provided with the winding. This eliminates the need for the insulating member 26 in Embodiment 1, and allows the ferrite cores 241 and 541 to be attached to the insulating member 251 before winding.

なお、上記絶縁部材２５１の内壁には、接地用の板ばね２８を設けている。   A grounding leaf spring 28 is provided on the inner wall of the insulating member 251.

この実施形態２の高周波加熱装置用昇圧変圧器によれば、上記フェライトコア２４１，５４１の中央部６１にギャップが無くても、磁気飽和が起こりにくいことが確認された。   According to the step-up transformer for a high-frequency heating device of the second embodiment, it was confirmed that magnetic saturation hardly occurs even if there is no gap in the central portion 61 of the ferrite cores 241 and 541.

また、上記フェライトコア２４１，５４１の中央部６１にギャップが無いから、ギャップがあるものに比べて、インダクタンス値が上がり、したがって、１次巻線２０および２次巻線２１の巻数を低減して、小型、軽量化およびコストダウンを達成できる。   Further, since there is no gap in the central portion 61 of the ferrite cores 241 and 541, the inductance value is increased as compared with those having a gap, and therefore the number of turns of the primary winding 20 and the secondary winding 21 is reduced. Small size, light weight and cost reduction can be achieved.

また、フェライトコアの中央部にギャップがある上記従来の高周波加熱装置用昇圧変圧器の１次巻線および２次巻線と、この実施形態の１次巻線２０および２次巻線２１の巻数を同じにした場合、この実施形態２では、上記フェライトコア２４１，５４１の中央部６１にギャップが無いから、フェライトコアの２４１，５４１の中央部６１の径を小さくしても、インダクタンス値を確保できて、フェライトコア２４１，５４１を小型、軽量化できて、生産効率を向上でき、コストダウンを達成できる。   In addition, the number of turns of the primary winding and the secondary winding of the conventional step-up transformer for a high-frequency heating device having a gap at the center of the ferrite core, and the primary winding 20 and the secondary winding 21 of this embodiment In the second embodiment, since there is no gap in the central portion 61 of the ferrite cores 241 and 541, the inductance value is secured even if the diameter of the central portion 61 of the ferrite cores 241 and 541 is reduced. Thus, the ferrite cores 241 and 541 can be reduced in size and weight, the production efficiency can be improved, and the cost can be reduced.

さらに、上記フェライトコアの２４１，５４１の中央部６１にギャップが無いから、漏れ磁束の発生を防止できる。   Furthermore, since there is no gap in the central portion 61 of the ferrite cores 241 and 541, the occurrence of leakage magnetic flux can be prevented.

（実施形態３）
図３は、この発明の実施形態３の昇圧変圧器の断面図である。図３において、図１，２に示された実施形態１および２の構成要素と同一構成要素については、図１，２の構成要素と同一の参照番号を付して、詳しい説明は省略する。以下、同様。 (Embodiment 3)
FIG. 3 is a cross-sectional view of a step-up transformer according to Embodiment 3 of the present invention. In FIG. 3, the same components as those of the first and second embodiments shown in FIGS. 1 and 2 are denoted by the same reference numerals as those of FIGS. 1 and 2, and detailed description thereof is omitted. The same applies hereinafter.

図３に示すように、ボビン形状の絶縁部材２５２の中心孔には、フェライトコア２４２，５４２の端部２４２ｃ，５４２ｃを配置し、この端部２４２ｃ，５４２ｃの先端を導電性接着剤７１によって互いに連結している。したがって、上記互いに連結された端部２４２ｃ，５４２ｃからなるフェライトコア２４２，５４２の中央部６２には、ギャップが無い。   As shown in FIG. 3, end portions 242 c and 542 c of the ferrite cores 242 and 542 are arranged in the center hole of the bobbin-shaped insulating member 252, and the ends of the end portions 242 c and 542 c are connected to each other by the conductive adhesive 71. It is connected. Accordingly, there is no gap in the central portion 62 of the ferrite cores 242 and 542 composed of the end portions 242c and 542c connected to each other.

このように、上記フェライトコア２４２，５４２の中央部６２にギャップが無いから、ギャップがあるものに比べて、インダクタンス値が上がり、したがって、１次巻線２０および２次巻線２１の巻数を低減して、小型、軽量化およびコストダウンを達成できる。   As described above, since there is no gap in the central portion 62 of the ferrite cores 242 and 542, the inductance value is increased as compared with the case where there is a gap, and therefore the number of turns of the primary winding 20 and the secondary winding 21 is reduced. Thus, a reduction in size, weight and cost can be achieved.

さらに、図２と図３との対比からも明らかなように、この実施形態３では、フェライトコア２４２，５４２の腕部２４２ａ，５４２ａは、放射状または円板状になっていて、腕部２４２ａ，５４２ａの肉厚は、実施形態２の場合に比べて薄くなっている。そのため、昇圧変圧器の高さＨをより低くできる上に、巻線を巻く前にフェライトコア２４２，５４２を取り付けた場合に、巻線時の回転モーメントを安定させることができ、その結果、巻線の巻乱れが生じにくくなるという利点がある。   Further, as is apparent from the comparison between FIG. 2 and FIG. 3, in the third embodiment, the arm portions 242a and 542a of the ferrite cores 242 and 542 are formed in a radial shape or a disc shape, and the arm portions 242a, The thickness of 542a is thinner than that of the second embodiment. Therefore, the height H of the step-up transformer can be further reduced, and when the ferrite cores 242 and 542 are attached before winding, the rotational moment at the time of winding can be stabilized. There is an advantage that the winding of the wire is less likely to occur.

（実施形態４〜７）
図４は、実施形態４を示し、図３に示した実施形態３の昇圧変圧器のフェライトコア２４２，５４２の中央部６２の導電性接着剤７１によって連結されている箇所とは、フェライトコア２４３，５４３の中央部６３の導電性接着剤７１によって連結されている箇所が異なるものである。 (Embodiments 4 to 7)
FIG. 4 shows the fourth embodiment, and the portion connected by the conductive adhesive 71 in the central portion 62 of the ferrite cores 242 and 542 of the step-up transformer of the third embodiment shown in FIG. 3 is the ferrite core 243. , 543 are connected to each other by the conductive adhesive 71 in the central portion 63.

また、図５は、実施形態５を示し、断面凸形状のフェライトコア２４４の凸部の先端と円板状または短冊状のフェライトコア５４４とを導電性接着剤７１によって連結している。この実施形態５では、フェライトコア５４４が円板状または短冊状であるから、その成形をより容易にすることができるという利点がある。   FIG. 5 shows the fifth embodiment, in which the tips of the convex portions of the ferrite core 244 having a convex cross section and the disc-shaped or strip-shaped ferrite core 544 are connected by the conductive adhesive 71. In the fifth embodiment, since the ferrite core 544 has a disk shape or a strip shape, there is an advantage that the molding can be made easier.

図６に示す実施形態６は、断面がＥ字形状のフェライトコア２４５と、円板状または短冊状のフェライトコア５４５を有する。上記フェライトコア２４５の中央部６５は、絶縁部材２５５の中心孔に挿通し、その中央部６５の先端をフェライトコア５４５の中心に導電性接着剤７１によって連結している。   Embodiment 6 shown in FIG. 6 has a ferrite core 245 having an E-shaped cross section and a ferrite core 545 having a disk shape or a strip shape. The central portion 65 of the ferrite core 245 is inserted through the central hole of the insulating member 255, and the tip of the central portion 65 is connected to the center of the ferrite core 545 by the conductive adhesive 71.

図７に示す実施形態７は、断面がＥ字形状のフェライトコア２４６と、断面がＥ字形状のフェライトコア５４６を有する。上記フェライトコア２４６，５４６の中央部を、絶縁部材２５５の中心孔に挿通し、両中央部の先端を導電性接着剤７１によって連結している。   7 includes a ferrite core 246 having an E-shaped cross section and a ferrite core 546 having an E-shaped cross section. The center portions of the ferrite cores 246 and 546 are inserted through the center hole of the insulating member 255, and the tips of both center portions are connected by the conductive adhesive 71.

（実施形態８）
図８に示す実施形態８では、ボビン形状の絶縁部材２５６の内部に、ボビン形状の一体のフェライトコア２４７をインサート成形等により埋め込んでいる。上記フェライトコア２４７の中央部６６には、ギャップが無い。 (Embodiment 8)
In Embodiment 8 shown in FIG. 8, a bobbin-shaped integral ferrite core 247 is embedded in a bobbin-shaped insulating member 256 by insert molding or the like. There is no gap in the central portion 66 of the ferrite core 247.

この実施形態８では、フェライトコア２４７が、そのフェライトコア２４７を封止している絶縁部材２５６によって絶縁されているから、安全規格等の要求に基づく接地を行なう必要がなくなると共に、フェライトコア２４７の取り付け工程を省略することができる。   In the eighth embodiment, since the ferrite core 247 is insulated by the insulating member 256 that seals the ferrite core 247, it is not necessary to perform grounding based on the requirements of safety standards and the like. The attachment process can be omitted.

（実施形態９）
図９および１０に示す実施形態９の昇圧変圧器は、ボビン形状の絶縁部材２５２の中心孔に、フェライトコア２４８の上端部とフェライトコア５４８の下端部とを配置し、コア固定バンド２７によって、フェライトコア２４８とフェライトコア５４８とを押圧して、この上端部と下端部とを互いに当接させている。これにより、フェライトコア２４８の上端部とフェライトコア５４８の下端部との間に、ギャップが無いようにしている。 (Embodiment 9)
In the step-up transformer of Embodiment 9 shown in FIGS. 9 and 10, the upper end portion of the ferrite core 248 and the lower end portion of the ferrite core 548 are disposed in the center hole of the bobbin-shaped insulating member 252, and the core fixing band 27 The ferrite core 248 and the ferrite core 548 are pressed to bring the upper end portion and the lower end portion into contact with each other. Thereby, there is no gap between the upper end portion of the ferrite core 248 and the lower end portion of the ferrite core 548.

なお、上記コア固定バンド２７の下側の端部２７ａが接地ピンとして機能している。   The lower end 27a of the core fixing band 27 functions as a ground pin.

２０ １次巻線
２１ ２次巻線
２４，５４，２４１，５４１，２４２，５４２，２４３，５４３，２４４，５４４，２４６，５４６，２４７，２４８，５４８ フェライトコア
２５，２５１，２５２，２５５，２５６ 絶縁部材
６０，６１，６２，６３，６４，６５，６６ 中央部
Ｔ１ １次巻線の重ね厚み
Ｔ２ ２次巻線の重ね厚み
Ｗ１ １次巻線の巻線幅
Ｗ２ ２次巻線の巻線幅 20 Primary winding 21 Secondary winding 24, 54, 241, 541, 242, 542, 243, 543, 244, 544, 246, 546, 247, 248, 548 Ferrite core 25, 251, 252, 255, 256 Insulating member 60, 61, 62, 63, 64, 65, 66 Central portion T1 Primary winding overlap thickness T2 Secondary winding overlap thickness W1 Primary winding width W2 Secondary winding winding width

Claims (4)

中心孔を有するボビン形状の絶縁部材と、
上記絶縁部材の中心孔内に配置された中央部を有するフェライトコアと、
上記絶縁部材に巻回され、その絶縁部材によって相互に絶縁される共に、巻線幅方向に互いに間隔をおいて対向するように、かつ、相互の結合係数が０．６５〜０．８になるように配された１次巻線および２次巻線と
を備え、
上記１次巻線および上記２次巻線のそれぞれの巻線幅が、上記１次巻線および上記２次巻線のそれぞれの重ね厚みより小さく、
上記２次巻線が、分割されることなく１つのブロックとして形成されており、
上記フェライトコアの中央部は連結されていてギャップが無い
ことを特徴とする高周波加熱装置用昇圧変圧器。 A bobbin-shaped insulating member having a central hole;
A ferrite core having a central portion disposed in the central hole of the insulating member;
The coil is wound around the insulating member, insulated from each other by the insulating member, facing each other at an interval in the winding width direction, and the mutual coupling coefficient is 0.65 to 0.8. A primary winding and a secondary winding arranged as follows:
The respective winding widths of the primary winding and the secondary winding are smaller than the respective overlapping thicknesses of the primary winding and the secondary winding;
The secondary winding is formed as one block without being divided,
A step-up transformer for a high-frequency heating device, characterized in that the central part of the ferrite core is connected and has no gap. 請求項１に記載の高周波加熱装置用昇圧変圧器において、
上記フェライトコアの中央部のうちの隣接する２つの部分は、導電性接着剤で接続されていることを特徴とする高周波加熱装置用昇圧変圧器。 The step-up transformer for a high-frequency heating device according to claim 1,
A step-up transformer for a high-frequency heating device, wherein two adjacent portions of the central portion of the ferrite core are connected by a conductive adhesive. 請求項１に記載の高周波加熱装置用昇圧変圧器において、
上記フェライトコアの中央部のうちの隣接する２つの部分は、互いに当接していることを特徴とする高周波加熱装置用昇圧変圧器。 The step-up transformer for a high-frequency heating device according to claim 1,
A step-up transformer for a high-frequency heating device, wherein two adjacent portions of the central portion of the ferrite core are in contact with each other. 請求項１から３のいずれか１つに記載の高周波加熱装置用昇圧変圧器において、
上記フェライトコアは、インサート成形によって上記絶縁部材の中に埋め込まれていることを特徴とする高周波加熱装置用昇圧変圧器。 The step-up transformer for a high-frequency heating device according to any one of claims 1 to 3,
A step-up transformer for a high-frequency heating device, wherein the ferrite core is embedded in the insulating member by insert molding.
JP2011289256A 2011-12-28 2011-12-28 Step-up transformer for high frequency heating apparatus Pending JP2013138151A (en)

Priority Applications (2)

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JP2011289256A JP2013138151A (en) 2011-12-28 2011-12-28 Step-up transformer for high frequency heating apparatus
PCT/JP2012/082302 WO2013099622A1 (en) 2011-12-28 2012-12-13 Booster transformer for radio frequency heating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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DE102014205044B4 (en) * 2014-03-19 2020-01-30 SUMIDA Components & Modules GmbH Method of manufacturing a magnetic core

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002134266A (en) * 2000-10-24 2002-05-10 Sharp Corp High frequency heating equipment
JP2003086431A (en) * 2001-06-29 2003-03-20 Tabuchi Electric Co Ltd Electromagnetic inductor
JP2004111528A (en) * 2002-09-17 2004-04-08 Matsushita Electric Ind Co Ltd Step-up transformer for magnetron drive
JP2005057150A (en) * 2003-08-07 2005-03-03 Tabuchi Electric Co Ltd Thin electromagnetic induction machine
JP3726010B2 (en) * 1999-06-03 2005-12-14 シャープ株式会社 Step-up transformer for high-frequency heating equipment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3726010B2 (en) * 1999-06-03 2005-12-14 シャープ株式会社 Step-up transformer for high-frequency heating equipment
JP2002134266A (en) * 2000-10-24 2002-05-10 Sharp Corp High frequency heating equipment
JP2003086431A (en) * 2001-06-29 2003-03-20 Tabuchi Electric Co Ltd Electromagnetic inductor
JP2004111528A (en) * 2002-09-17 2004-04-08 Matsushita Electric Ind Co Ltd Step-up transformer for magnetron drive
JP2005057150A (en) * 2003-08-07 2005-03-03 Tabuchi Electric Co Ltd Thin electromagnetic induction machine

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