JPS6174312A - High-tension transformer for high-frequency heating apparatus - Google Patents

High-tension transformer for high-frequency heating apparatus

Info

Publication number
JPS6174312A
JPS6174312A JP59197116A JP19711684A JPS6174312A JP S6174312 A JPS6174312 A JP S6174312A JP 59197116 A JP59197116 A JP 59197116A JP 19711684 A JP19711684 A JP 19711684A JP S6174312 A JPS6174312 A JP S6174312A
Authority
JP
Japan
Prior art keywords
core
coil
secondary coil
distance
transformer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP59197116A
Other languages
Japanese (ja)
Inventor
Kiyoshi Itsuno
五野　潔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP59197116A priority Critical patent/JPS6174312A/en
Publication of JPS6174312A publication Critical patent/JPS6174312A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/10—Single-phase transformers
    • 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
    • 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
    • H01F2038/003—High frequency transformer for microwave oven

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Insulating Of Coils (AREA)

Abstract

PURPOSE:To enable the miniaturization of a high-tension transformer, by separating the secondary high tension side of an insulating transformer completely from a power source while enabling the generation of a secondary-side high tension with usual insulation specifications unvaried. CONSTITUTION:The primary coil 6 of an insulating transformer 3 is provided with terminals 15, and it is doubly insulated from a core 16 by insulating paper 17. A high-tension secondary coil 7 is divided from the primary coil 6 with larger separation therefrom than a necessary spatial distance. Moreover, a metal plate 8 is provided, and the distance of the metal plate 8 from the secondary coil 7 is made smaller sufficiently than the distance between the secondary coil 7 and the primary coil 6 and the distance between the components on the secondary high tension side and those on the primary power source side. By this construction, the secondary high tension side can be separated completely from the primary power source side while the insulation of the insulating transformer 3 and the components on the secondary high tension side is maintained as usual.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、二重絶縁構造にして、アース工事を不要にし
た、高周波加熱装置の高圧トランスの小形化に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to miniaturization of a high voltage transformer for a high frequency heating device, which has a double insulation structure and eliminates the need for grounding work.

従来例の構成とその問題点 従来の例えばアース端子付高周波加熱装置（以下単にレ
ンジと云う）は、万一の絶縁劣化によって、レンジの可
触金属部分に潴電した場合、これを知らずに触れて感電
することがあり、アース端子に大地アース工事を施こし
、感電々流をバイパスさせて人体に流れる感電々流を安
全なレベルまで減少させて安全を確保しようとするもの
であった。Conventional configurations and their problems Conventional high-frequency heating devices (hereinafter simply referred to as microwave ovens) with a ground terminal, for example, can be used without knowing that if electrical current is applied to accessible metal parts of the microwave oven due to insulation deterioration. In order to ensure safety, the electric shock current that flows through the human body can be reduced to a safe level by installing earth grounding work on the earth terminal to bypass the electric shock current that flows through the human body.

しかし、アース端子を設けていても、アース工事はレン
ジを購入後に行う訳であり、種々の理由により実施され
ない可能性がちシ、安全を確保することが難しかった。However, even if a grounding terminal is provided, grounding work must be done after the stove is purchased, and there is a high possibility that the work will not be done for various reasons, making it difficult to ensure safety.

即ち、高層マンションの場合、コンセントにアース端子
が設けられておればそれを利用すれば良い力；、これは
現在約３０形程度しか設けられていない為に、大部分は
数メートルから十数メートルもアース線を延長して大地
にアース極を打ち込む必要があシ、工事代がかさむ等の
理由で実施されない。特に、転勤、転宅時に、アース工
事をやり直す必要があるので益々実施が難しくなる傾向
にある。In other words, in the case of high-rise condominiums, if the electrical outlet has a ground terminal, it is sufficient to use it.Currently, there are only about 30 types of ground terminals, so most of them are from a few meters to more than 10 meters. However, this method is not implemented because it requires extending the ground wire and driving the ground pole into the ground, which increases the construction cost. In particular, when relocating or moving to another home, grounding work has to be redone, which tends to make it increasingly difficult to implement.

また、高層マンションでなくとも、アルミサツシュの窓
は密閉したいのでアース線を貫通させる孔を壁にあけな
ければならないとか、大地に打ち込もうとしても、コン
クリートであるため、アース匣が打ち込めないと云った
理由でアース工事が実施されないことも相当あるのが現
状である。Also, even if you are not in a high-rise apartment building, you may have to make a hole in the wall for the grounding wire to seal the aluminum satsui window, or if you try to drive it into the ground, you will be told that you cannot insert a grounding box because it is made of concrete. Currently, there are many cases in which grounding work is not carried out for various reasons.

ある調査によれば、約４０〜５０％のレンジが、アース
工事されないまに使用されているのが現状である。According to a survey, about 40 to 50% of microwave ovens are currently used without being grounded.

さらに、仮シにアース極が大地に打ち込まれ、アース工
事がされていたとしても、アース極を打ち込む場所が乾
いていだシ造成工事の都合から、表面にガラ石を敷いて
水はけを良好にした場所等であると低地抵抗が大きくな
ってしまい充分な安全が確保出来なくなる。その他、ア
ース樺の腐蝕や、アース線の断線の可能性もあり、従来
のアース極付レンジは信頼性の充分あるアース工事を前
提にして始めて、安全確保がなされる性質のものであっ
た。Furthermore, even if a grounding pole had been temporarily driven into the ground and grounding work had been carried out, the area where the grounding pole would be driven would dry out.For reasons of construction work, glass stones were laid on the surface to improve drainage. If the location is too low, the low ground resistance will increase and sufficient safety will not be ensured. In addition, there is the possibility of corrosion of the ground birch and breakage of the ground wire, so conventional ranges with a ground pole were designed to ensure safety only on the premise of reliable grounding work.

一方、最近、レンジの普及に伴い、軽量、小形化される
と伴に、使用場所も自由に選択できるとか、固定せずに
使えるものが求められる傾向がちシ、この点からも、ア
ース工事をしなければならない従来のアース端子付レン
ジは、不便なものであった。On the other hand, as microwave ovens have recently become more popular, they have become lighter and more compact, and there is a tendency for appliances that can be used freely and that can be used without being fixed. Conventional microwave ovens with ground terminals, which require grounding, are inconvenient.

発明の目的 本発明は、上記従来の欠点を解消するもので、レンジを
二電絶縁構造にすることを目的とするものであり、特に
、絶縁トランスの２次高圧側を、電源側から完全に分離
し、２次側高圧は従来の絶縁仕様のま−で、可能とする
ことにより、高圧トランスの小形化を実現することを目
的とする。Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and aims to provide a microwave oven with a two-electrical insulation structure.In particular, the secondary high-voltage side of the isolation transformer is completely isolated from the power supply side. The purpose is to realize miniaturization of the high voltage transformer by separating the secondary side high voltage and making it possible to maintain the conventional insulation specifications.

発明の構成 上記目的を達するため、本発明の絶縁トランスは、高電
圧の２次側の一端は従来通りマグネトロンが接続されて
いる加熱庫や外箱の金属部（以下ンヤーシと云う）に直
結し、シャーシに直結された金属板によって高電圧の２
次側の他端の高圧が１次電源側に漏電することのないよ
うにした構成であり、高電圧の２次側を、コアーに直結
した金属板によって実質的に、１次電源側からシャーシ
並びに金属板で囲うことにより万一絶縁劣化が発生して
も、２次側の高電圧が、１次電源側に橋絡することを完
全に阻止し、レンジの高電圧による怒電から、人体を安
全に保護しようとするものである。Structure of the Invention In order to achieve the above object, the insulating transformer of the present invention has one end of the high voltage secondary side directly connected to the metal part of the heating cabinet or outer box (hereinafter referred to as "Nyashi") to which the magnetron is connected. , a metal plate directly connected to the chassis allows high voltage 2
This configuration prevents the high voltage at the other end of the secondary side from leaking to the primary power supply side. In addition, by surrounding it with a metal plate, even if insulation deterioration occurs, the high voltage on the secondary side will be completely prevented from bridging to the primary power supply side, and the human body will be protected from the electric shock caused by the high voltage of the range. The aim is to safely protect the

実施例の説明 以下、本発明の一実施例について、図面に基づいて説明
する。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

第１図において、ンヤーシ１には、マグネトロン２が接
続され、マグネトロン２の駆動電源として絶縁トランス
３．高圧コンデンサ４．高圧ダイオード５があシ、これ
らは、レンジの後方にまとめられて取り付けられている
。絶縁トランス３は、電源側に接続される１次コイル６
と高圧２次コイ／Ｉ／７とが分割巻きされ、この間に、
混触防止板として金属板８が設けられ、これは、トラン
ス３のコアーに直結されている。マグネトロン２から延
出した金属板２２は、低圧１次コイ／Ｆ／６と高圧２次
配線の間に介在して取シ付けられている。高圧２次コイ
ル７の１端は、トランス３のコアーに直結されており、
コアーはシャーン１に導通している。従って、高圧２次
コイル７の１端並びに金属板８並びに金属板２２は、と
もにシャーシに接続されている。In FIG. 1, a magnetron 2 is connected to a magnetron 1, and an isolation transformer 3. High voltage capacitor 4. There are high voltage diodes 5, which are mounted together at the rear of the range. The isolation transformer 3 has a primary coil 6 connected to the power supply side.
and the high-voltage secondary coil/I/7 are dividedly wound, and during this time,
A metal plate 8 is provided as a contact prevention plate, and is directly connected to the core of the transformer 3. A metal plate 22 extending from the magnetron 2 is installed interposed between the low voltage primary coil/F/6 and the high voltage secondary wiring. One end of the high voltage secondary coil 7 is directly connected to the core of the transformer 3.
The core is electrically connected to Sharn 1. Therefore, one end of the high-voltage secondary coil 7 and the metal plates 8 and 22 are both connected to the chassis.

一方、電源コード９は、操作板１０に接続され、制御回
路用駆動電源トランス１１や、冷却モータ１２、リレー
１３等の１次電源に直結した部品が、マグネトロン２や
トランス３等の金属壁で２次高圧部から分離されて、操
作バネ）ｖ　（図示せず）のある前面に近く取り付けら
れている。尚、これら１次電源に直結された部品は、電
源とシャーシ１等の可融部から二重絶縁されている。前
方には、被加熱物である食品を出し入れする扉１４が設
けられている。On the other hand, the power cord 9 is connected to the operation panel 10, and parts directly connected to the primary power source, such as the drive power transformer 11 for the control circuit, the cooling motor 12, and the relay 13, are connected to the metal wall such as the magnetron 2 and transformer 3. It is separated from the secondary high pressure section and is attached close to the front face with an operating spring (not shown). Note that these parts directly connected to the primary power source are double insulated from the power source and the fusible parts of the chassis 1 and the like. A door 14 is provided at the front to take in and take out food, which is an object to be heated.

第２図は、絶縁トランス３の斜視図で、１次コイル６に
は、電源回路に配線する端子１６があシ、コアー１６と
の間には、絶縁紙１７により、二重絶縁されている。高
圧２次コイ／ｖ７は、１次コイ／Ｌ’６と分割され、必
要な空間距離、例えば１３ｍｍ以上離して分割されてい
る。従来この部分は、並びに２次コイルとコアー１６と
の間は１０１１１ｍ以上の空間距離が要求されていた。FIG. 2 is a perspective view of the insulating transformer 3. The primary coil 6 has a terminal 16 for wiring to the power supply circuit, and the core 16 is double insulated with an insulating paper 17. . The high-voltage secondary coil/v7 is separated from the primary coil/L'6 by a necessary spatial distance, for example, 13 mm or more. Conventionally, a spatial distance of 10111 m or more was required between this part and the secondary coil and the core 16.

コアー１６との間には同じく絶縁紙１８により絶縁され
ており、２次コイルとコアー１６との間は１０［ｎｍ以
上の空間距離がとられているが二重絶縁されてはいない
。The secondary coil is insulated from the core 16 by an insulating paper 18, and there is a spatial distance of 10 nm or more between the secondary coil and the core 16, but no double insulation is provided between the secondary coil and the core 16.

高圧２次回路には約２０００ｖの交流が発生するが、今
仮シに二重絶縁するにはこの部分並びに、２次コイルと
コアーとの間は、それぞれ２０ｍｍ以上の空間距離をと
ることが必要となるが、例えばコアーと２次コイルとの
間の空間距離２０ｍ［１１以上を満足する絶縁紙１８は
、コイルの高さ寸法より大きくなりか−る高圧トランス
を考えることは、非現実的である。また、現在、２００
０’／程度の高電圧に対する二重絶縁については、明解
な規格なシ、設計基準が定められているわけでなく、絶
縁紙１８の二重絶縁構造として国際的な定見は示されて
いないのが現状であるため、二重絶縁構造のレンジは実
現されていない。Approximately 2000v of alternating current is generated in the high-voltage secondary circuit, but in order to provide temporary double insulation, it is necessary to provide a space distance of 20mm or more between this part and the secondary coil and the core. However, for example, it is unrealistic to consider a high-voltage transformer in which the insulating paper 18 that satisfies the spatial distance of 20 m [11 or more] between the core and the secondary coil is larger than the height of the coil. be. Also, currently 200
There are no clear standards or design standards for double insulation against high voltages of about 0'/0, and no international consensus has been provided for the double insulation structure of insulating paper 18. Due to the current situation, a microwave oven with double insulation structure has not been realized.

本発明では、金属板８並びに金属板２２等を設け、２次
コイ／Ｌ’７からの金属板８の距離並びに２次高圧側の
部品と金属板２２等との距離を、２次ニイル７から１次
コイ／ｌ／６の距離並びに、２次高圧側の部品と１次電
源側の部品との距離にくらべ充分小さくすることにより
、はゾ従来通りの寸法の絶縁トランス３並びに２次高圧
側の部品の従来通）の絶縁のま＼で２次高圧側を１次電
源側から完全に分離することにより、二重絶縁構造のレ
ンジを実現すると共に、高圧トランス３のコアー１６に
設けた金属板８の構造を工夫することによって、はｙ従
来の寸法並びにコストのま一上記の構造を実現し得たも
のである。In the present invention, the metal plate 8, the metal plate 22, etc. are provided, and the distance of the metal plate 8 from the secondary coil/L'7 and the distance between the parts on the secondary high voltage side and the metal plate 22, etc. By making the distance from the primary coil/l/6 sufficiently small compared to the distance between the components on the secondary high voltage side and the components on the primary power supply side, the isolation transformer 3 and the secondary high voltage By completely separating the secondary high-voltage side from the primary power supply side while maintaining the conventional insulation of the side parts, a double-insulated range was realized. By devising the structure of the metal plate 8, it was possible to realize the above-mentioned structure while keeping the dimensions and costs of the conventional ones.

即ち、第３図に示すように、１次コイル６と２次コイル
７の空間距離は、従来から１０ｍｍ以上あることが要求
されているため、現在１２〜１５１１ｍになっているの
が普通である。これに対し、２次コイ／ｌ／７は、コア
ー１６から現在１７〜２ｏＯ］ｍの高さを有するが、例
えば本実施例では、これを１０〜１２［ＬＩＩＩｌとし
、かつ次に述べるような１１〜１２ＫＶ程度で２次コイ
ルア７とコアー１６間で放電ないしは、絶縁不良を発生
するような、絶縁仕様とすることにより、実質的に、１
次コイル６と２次コイル７が直接橋絡しない構造にする
ことができる。That is, as shown in Fig. 3, the spatial distance between the primary coil 6 and the secondary coil 7 has conventionally been required to be 10 mm or more, so it is currently generally 12 to 1511 m. . On the other hand, the secondary coil/l/7 currently has a height of 17 to 2oO]m from the core 16, but in this embodiment, for example, this height is set to 10 to 12[LIIIl, and as described below. By making the insulation specifications such that discharge or insulation failure occurs between the secondary coil 7 and the core 16 at approximately 11 to 12 KV, it is practically possible to
The structure can be such that the secondary coil 6 and the secondary coil 7 are not directly bridged.

第４図に、その絶縁仕様の一例について述べる。FIG. 4 describes an example of the insulation specifications.

（Ｑの場合は、コアー１６からシャープエツジ２７を有
する金属板８を２次コイ／ｌ／７に１次コイル６よりも
近づけて立て、シャープエツジ２７とコイ／Ｌ／７の距
離を１０〜１２ｍｍにすることにょシ、１次コイ／ｌ／
６と２次コイルＴの距１！ＩＩ（例えば１５ａｒｍ）よ
シ実質的に小さくし、かつシャープエツジ２７を設ける
一方、１次コイ／ｌ／６のエツジ部Ｒは例えば半径０．
５市以上の線径としてまるくすることにより２次コイ／
ｌ／７の絶縁劣化時に、２次コイル７と１次コイ／ｌ／
６間にくらべて２次コイ）Ｖ７とシャープエツジ２７間
でとび易くしている。(In the case of Q, the metal plate 8 having the sharp edge 27 from the core 16 is placed closer to the secondary coil/L/7 than the primary coil 6, and the distance between the sharp edge 27 and the coil/L/7 is set at 10~ I decided to make it 12mm, primary carp / l /
The distance between 6 and the secondary coil T is 1! II (for example, 15 arms) and provide a sharp edge 27, while the edge portion R of the primary coil/l/6 has a radius of, for example, 0.
Secondary carp/
When the insulation deteriorates at l/7, the secondary coil 7 and the primary coil /l/
It is easier to jump between the secondary carp) V7 and Sharp Edge 27 compared to 6.

（ｂ）の場合は、２次コイ／ｌ／６のコアー１６からの
高さを小さくし、かつ、コアー１６とコイル７間の絶縁
紙１８の重なり端面２８を、１次コイ／Ｆ／６と２次コ
イ／ｌ／７間の近くに持って来て、万一、２次コイルア
の絶縁劣化時に、この端面２８を通して２次コイル７と
コアー１６間に放電を発生し易くしている。表１は、絶
縁紙１８を介して２次コイ／ｌ／７とコアー１６の表面
距離ｇｓを１１［１１ｍとし、１次コイ／Ｌ’６と２次
コイ）Ｌ／７間の電圧を上げていった場合の絶縁破壊電
圧値と、破壊した部分を調べたのが表１である。ただし
、２次コイル７の一端はコアー１６にアースされ、２次
コイ／ｌ／７は整列巻きして、コアー１６から見て最上
端の電圧が最高となるように巻いてあり、最上端には端
子２９があって開放されている。（即ち、２次高圧側は
無負荷になっている。）この状態で１次巻線６の電圧と
周波数を上けていって、２次端子２９とコアー１６間の
電圧を上昇させ、破壊した時の値を絶縁破壊電圧として
いる。In the case of (b), the height of the secondary coil/F/6 from the core 16 is reduced, and the overlapping end surface 28 of the insulating paper 18 between the core 16 and the coil 7 is and the secondary coil /l/7, so that in the unlikely event that the insulation of the secondary coil A deteriorates, discharge can easily occur between the secondary coil 7 and the core 16 through this end face 28. Table 1 shows that the surface distance gs between the secondary coil/l/7 and the core 16 is set to 11 [11 m] through the insulating paper 18, and the voltage between the primary coil/L'6 and the secondary coil L/7 is increased. Table 1 shows the dielectric breakdown voltage values and the parts that broke down in the following cases. However, one end of the secondary coil 7 is grounded to the core 16, and the secondary coil/l/7 is wound in alignment so that the voltage at the top end is the highest when viewed from the core 16. has a terminal 29 which is open. (In other words, there is no load on the secondary high voltage side.) In this state, the voltage and frequency of the primary winding 6 are increased to increase the voltage between the secondary terminal 29 and the core 16, causing damage. The value at which this occurs is considered the dielectric breakdown voltage.

（以下余　白） 表１ 即ち、一般に、空中を通し絶縁破壊を起こす電圧は、第
５図に示すような値となり、これは、大気の温度・湿度
・絶縁物の材質・表面状態（汚れ等）により大きく左右
されるが、少くとも、表１の絶縁破壊は、２次コイ／ｌ
ｚ７の表面を経由してコ・アー１６に至るものであり、
第５図の試験結果を考慮して、上記の条件が変動しても
１次コイル６と２次コイ１Ｌｔ７の空中を通して直接橋
絡する恐れは、まず発生しないと考えて良い。(Left below) Table 1 In other words, in general, the voltage that passes through the air and causes dielectric breakdown is the value shown in Figure 5, which depends on the temperature and humidity of the atmosphere, the material and surface condition of the insulator (such as dirt, etc.). ), but at least the dielectric breakdown in Table 1 is based on the secondary coil/l
It reaches core 16 via the surface of z7,
Considering the test results shown in FIG. 5, it can be considered that even if the above-mentioned conditions change, there is no risk of direct bridging occurring between the primary coil 6 and the secondary coil 1Lt7 through the air.

以上の（ａ）及び（ｂ）の構造は、従来の高圧トランス
３の寸法を、少くとも二重絶縁構造にする為に大きくし
なければならないと云うものではない。むしろ、（２Ｌ
）及び（ｂ）の構造を組み合せることによシ、従来よシ
小形化することすら可能であることを示唆している。The above structures (a) and (b) do not mean that the dimensions of the conventional high voltage transformer 3 must be increased in order to have at least a double insulation structure. Rather, (2L
This suggests that by combining the structures of ) and (b), it is even possible to make the structure smaller than before.

以下上記構成における作用について説明する。The operation of the above configuration will be explained below.

第６図に、本発明の一実施回路を示す。FIG. 6 shows one implementation circuit of the present invention.

人体１９がレンジを操作していて例えば加熱庫に触れて
いるとする。加熱庫並びに箱体の金属部は前述のように
シャーシ１を構成している。Suppose that the human body 19 is operating the microwave and is touching the heating chamber, for example. The heating chamber and the metal part of the box constitute the chassis 1 as described above.

今、柱上トランスから引込まれた電源にレンジを接続し
ているので、１００Ｖの電源２Ｑの１端２１は、大地に
アースされている。Since the range is now connected to the power source drawn from the pole transformer, one end 21 of the 100V power source 2Q is grounded to the ground.

１００Ｖの電源回路に直結される冷却モータ１２、リレ
ー１３．制御回路駆動電源トランス１１、電源コード９
並びに絶縁トランス３の１次コイ／Ｌ／６等の電源側の
部品は、シャーシ１から全て二重絶縁によって保護され
ているので、面電の心配はないと云える。A cooling motor 12 and a relay 13 directly connected to a 100V power supply circuit. Control circuit drive power transformer 11, power cord 9
In addition, all parts on the power supply side such as the primary coil/L/6 of the isolation transformer 3 are protected from the chassis 1 by double insulation, so there is no concern about surface electricity.

一方、絶縁トランス３の２次コイ／Ｌ／７には、約２０
００Ｖの高電圧が発生している。２次コイル７の一端２
２は、シャーシ１にトランス３のコアー１６を介して接
続されている。コアー１６に直結された金属板８並びに
シャーシに直結された金属板２２が、実質的に電源側と
高圧側を分離しているので、万一２次高圧側の例えば２
次コイ／Ｌ／７の人魚が絶縁劣化しても、１次コイ／ｌ
ｚ６とは直接に橋絡されることはない。On the other hand, the secondary coil /L/7 of the isolation transformer 3 has approximately 20
A high voltage of 00V is generated. One end 2 of the secondary coil 7
2 is connected to the chassis 1 via the core 16 of the transformer 3. Since the metal plate 8 directly connected to the core 16 and the metal plate 22 directly connected to the chassis substantially separate the power supply side and the high voltage side, in the unlikely event that the secondary high voltage side
Even if the insulation of the next carp/L/7 mermaid deteriorates, the primary carp/L
It is not directly bridged with z6.

例えば、絶縁劣化した結果、シャーシ１に高電圧が導通
した場合を考える。導通したＡ点からンヤーン１に低抵
抗ｒを介してつながった場合、電流は、シャーン１を通
して流れるのみで人体１９に流れることはない。For example, consider a case where a high voltage is conducted to the chassis 1 as a result of insulation deterioration. When the conductive point A is connected to the yarn 1 via a low resistance r, the current flows only through the yarn 1 and does not flow to the human body 19.

即ち、第７図に示すように、従来のアース端子付レンジ
では１次コイルア６と２次コイルアの間で橋絡が発生し
た場合は、人体１９を通して２０００Ｖの高電圧によっ
て感電電流が流れ極めて危険な状態になる。That is, as shown in Fig. 7, in the case of a conventional range with a ground terminal, if a bridge occurs between the primary coil 6 and the secondary coil 1, an electric shock current will flow through the human body 19 due to a high voltage of 2000 V, which is extremely dangerous. It becomes a state.

１次コイ／Ｌ／６と２次コイ／Ｌ／７が抵抗値Ｒ（Ｒ嬌
０）で橋絡した場合、矢印の回路が形成されて、電源１
ｏＯｖを含み、高圧２次電圧の２０００Ｖの電圧がこの
回路に加わるために、例えば人体抵抗が、６ｏ○Ωに低
下していると２０ム近い感電電流が人体を通過し瞬時に
死に至る。この時、従来のレンジにアース端子を設け、
仮シに規定通シ１００Ωで大地にアース工事がされてい
たと仮定しても、人体には約３．４人の電流が流れるこ
とになる。この電流が人体に流れた場合現在国際的には
、３０ｍ人、　ＳｅＣの通電電流時間積が心臓ショック
死を起こさない安全限界と考えられているので、この場
合は、何と、０．０１秒以上感電状態が続けば、危険と
なることがわかる。When the primary coil/L/6 and the secondary coil/L/7 are bridged with a resistance value R (R 嬌0), the circuit shown by the arrow is formed, and the power supply 1
Since a high voltage secondary voltage of 2000V including oOv is applied to this circuit, for example, if the resistance of the human body is reduced to 6O○Ω, an electrocution current of nearly 20μ will pass through the human body, resulting in instant death. At this time, we installed a ground terminal on the conventional range,
Even if we assume that the earth was grounded to the earth with a specified resistance of 100 ohms, approximately 3.4 currents would flow through the human body. If this current were to flow through the human body, it is currently internationally considered that the current-time product of 30 m of SeC is the safe limit that will not cause death from cardiac shock, so in this case, it will last for more than 0.01 seconds. If the electric shock condition continues, it can become dangerous.

従って、現在のところ、大地アースをとっていても、絶
縁トランスの１次コイルと２次コイル間で、絶縁不良に
よって橋絡した場合には、極めて危険であり、安全が保
障できていないと云うことがいえる。Therefore, even if the transformer is grounded to the ground, if a bridge occurs between the primary and secondary coils of an isolation transformer due to poor insulation, it is extremely dangerous and safety cannot be guaranteed. I can say that.

この点、本実施例では、２０００Ｙの２次高電圧で感電
する恐れは全くなくなるので、従来にくらべ、極めて安
全な構造であると云える。In this respect, in this embodiment, there is no risk of electric shock due to the secondary high voltage of 2000 Y, so it can be said that the structure is extremely safe compared to the conventional structure.

又、第１図で、２次高電圧回路の部品である高圧コンデ
ンサ４や、高圧ダイオード５は、トランス３のコアー６
やマグネトロン２の金属ケース並びに金属板２２によっ
て、電源回路の部品から分離されている。In addition, in FIG. 1, the high voltage capacitor 4 and high voltage diode 5, which are components of the secondary high voltage circuit, are connected to the core 6 of the transformer 3.
It is separated from the components of the power supply circuit by the metal case of the magnetron 2 and the metal plate 22.

即ち、高電圧２次側の部品とシャーシとの距離は、低圧
の電源側の部品と高電圧２次側の部品との距離よりも短
くなるよう構成されているため、高電圧２次側が、低圧
の電源側につながる恐れは全くない。In other words, since the distance between the components on the high voltage secondary side and the chassis is configured to be shorter than the distance between the components on the low voltage power supply side and the components on the high voltage secondary side, the high voltage secondary side There is no risk of it being connected to the low voltage power supply side.

また、高圧トランス３の１次コイ／ｌ／６と２次コイル
７が構造的に最も近づき易いことになるが、本実施例に
述べたように、実質的に１次コイ）Ｌ／６と２次コイ／
Ｌ／７の距離よりも、２次コイ／Ｌ／７とコアー１６の
距離を短くし、確実に、１次コイル６と２次コイ／Ｌ／
７の間の橋絡を阻止すると共に、トランス３の小形化も
可能になる。Furthermore, although the primary coil L/6 and the secondary coil 7 of the high voltage transformer 3 are structurally the easiest to approach, as described in this embodiment, the primary coil L/6 and Secondary carp/
Make the distance between the secondary coil /L/7 and the core 16 shorter than the distance of L/7 to ensure that the primary coil 6 and the secondary coil /L/
In addition to preventing bridging between the transformers 7 and 7, it is also possible to downsize the transformer 3.

さらに、金属板８は、コアー１６の最外部の積層板の一
部を切り起こすと云う構造をとることもできるので、極
めて構造も簡単で、二重絶縁構造にするだめの余分な金
属板を追加しなくてもよい。Furthermore, the metal plate 8 can have a structure in which a part of the outermost laminated plate of the core 16 is cut and raised, so the structure is extremely simple, and the extra metal plate that would otherwise be required for the double insulation structure can be removed. You don't need to add it.

このように、本実施例によれば、高電圧２次側の一端を
シャーシに直結した絶縁トランスにおいて、高圧２次コ
イルと低圧の電源側１次コイルを分割巻きし、かつ２次
コイルと１次コイル間に、コアーに直結した金属板を設
けるか或いは、２次コイルとコアー間の距離と１次コイ
ルとＱ距離よりも小さくすると共に、当該金属板と２次
コイルとの距離を、２次コイルと１次コイルとの距離よ
臓も短くし・かつ金属板２２や７・−７に直結した金属
壁で高電圧２次側の部品とシャーシとの距離を、高電圧
２次側の部品と電源側の部品との距離よりも短くすると
共に、１次コイル並びに電源側につながる部品をシャー
シから二重絶縁することによシ、アース工事を不要とす
るだけでなく、高電圧２次側の電圧による万一の感電事
故が防止でき、従来に較べて、極めて安全性の高いレン
ジを可能にするという効果を有する。As described above, according to the present embodiment, in the isolation transformer in which one end of the high voltage secondary side is directly connected to the chassis, the high voltage secondary coil and the low voltage power supply side primary coil are wound separately, and the secondary coil and the primary coil are wound separately. Provide a metal plate directly connected to the core between the secondary coils, or make the distance between the secondary coil and the core smaller than the Q distance between the primary coil and the distance between the metal plate and the secondary coil. The distance between the secondary coil and the primary coil is shortened, and the distance between the high voltage secondary side parts and the chassis is shortened by the metal wall directly connected to the metal plates 22, 7 and -7. By making the distance between the components shorter than those on the power supply side and double insulating the primary coil and components connected to the power supply side from the chassis, it not only eliminates the need for grounding work, but also eliminates the need for high-voltage secondary This has the effect of preventing an accidental electric shock due to side voltage, and making it possible to use a range that is extremely safe compared to conventional microwave ovens.

発明の効果 以上のように本発明によれば、撞めて簡単な構造であり
ながら、二重絶縁構造のレンジを実現でき、次のように
安全性が高く、かつ高圧トランスは従来にくらべて、同
じかむしろ小形化が可能になると云う多くの効果を得る
ことができる。Effects of the Invention As described above, according to the present invention, it is possible to realize a microwave oven with a double insulation structure while having a simple structure, and it is highly safe as shown below, and the high voltage transformer is better than the conventional one. , it is possible to obtain many effects such as the same or even miniaturization.

（１）　　レンジとしてはアース工事が不要になるので
、工事費用がいらないだけでなく、次のような利点があ
る。(1) Since the microwave oven does not require any grounding work, it not only eliminates construction costs but also has the following advantages.

■　レンジの設置場所を移動することが自在となり、特
に軽量・小形のレンジは、必要な場所までレンジを移動
して使用することができるようになった。■ It has become possible to move the installation location of the microwave oven, especially lightweight and small microwave ovens, which can now be moved to the required location for use.

■　アース工事では、経年的に、アース極の腐蝕やアー
ス線の断線等の心配があったが、その心配は、全くなく
なった。■ During grounding work, over time there were concerns about corrosion of the ground electrode and breakage of the ground wire, but those concerns have completely disappeared.

（噂　従来とはソ同じ形状で、二重絶縁構造とすること
が可能なため、レンジの寸法やコストとも安く、簡単な
対策で実施できるので、従来のアース極や、アース工事
費を考えた場合、却ってコストが安くできるようになっ
た。(Rumor) Since it has the same shape as the conventional one and can have a double insulation structure, the size and cost of the range are low, and it can be implemented with simple measures, so it is possible to replace the conventional grounding pole and grounding construction costs. In fact, the cost has become cheaper.

特に、高圧トランスは、レンジの部品のうちで大形であ
るだけでなく、１次コイルと２次コイルが近接している
ため二重絶縁が困難であったが、金属板８あるいは、２
次コイルの高ざを小さくして、コアーとの距離を小さく
し、かつ１次コイルにくらベコアーに橋絡し易い構造に
することによって、従来とはソ同じ寸法で、むしろ小形
化が可能になる等の啄めて大きな効果も期待できるよう
になった。In particular, high-voltage transformers are not only large among the microwave components, but also have their primary and secondary coils close to each other, making double insulation difficult.
By reducing the height of the secondary coil, reducing the distance from the core, and creating a structure that allows easy bridging between the primary coil and the core, the size is the same as that of the conventional model, and it is actually possible to downsize. It is now possible to expect great effects such as naru.

また、金属板も、積層した最外部のコアーの一部を切り
起こすだけの簡単な構成にするなど、二重絶縁構造にす
るだめのコストアップを低くおさえることができる。In addition, the metal plate can be constructed simply by cutting out a part of the outermost layered core, thereby reducing the cost increase that would otherwise be required for a double insulation structure.

（３）従来のアース端子材のレンジでは、例えば２次高
電圧が１次コイルに橋絡した場合には、感電防止が殆ん
ど不可能でめったが、本発明のものであれば、この心配
は全くなくなるため、極めて安全性の高いレンジを実現
することが出来た。(3) With conventional ranges using ground terminal materials, it is almost impossible to prevent electric shock if, for example, a secondary high voltage bridges the primary coil, but with the one of the present invention, this can be prevented. Since there is no need to worry, we were able to create an extremely safe range.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例であるレンジの側面図、第２
図は同実施例の絶縁トランスの斜視図、第３図は１次コ
イルと２次コイル並びにコアー間の距離を示す図、第４
図は同高圧トランスの寸法関係を示す図、第６図は空中
・沿面の絶縁破壊試験結果を示す図、第６図は本発明の
一実施例である回路図、第７図は従来のアース端子付レ
ンジの感電電流の経路を説明する図である。 １−・−・・・シャーシ、２・・・・・・マクネトロン
、３・・・・・・絶縁トランス、６・・・・・・１次コ
イル、７・・・・・・２次コ人体、２ｏ・・・・・・電
源、２１・・−・・・電源の大地アースされた一端、２
７：・・・・・シャープ；ツジ、２８・・・・・・絶縁
紙端部。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名第１
図 ′ｌ 第２図 第５図 三関距＃ｌ慨恨 第６図 第　７　図Fig. 1 is a side view of a microwave oven which is an embodiment of the present invention;
The figure is a perspective view of the insulation transformer of the same embodiment, Figure 3 is a diagram showing the distance between the primary coil and secondary coil and the core, and Figure 4 is a diagram showing the distance between the primary coil and secondary coil and the core.
The figure shows the dimensional relationship of the high-voltage transformer, Figure 6 shows the results of insulation breakdown tests in air and creeping, Figure 6 is a circuit diagram of an embodiment of the present invention, and Figure 7 shows the conventional grounding method. It is a figure explaining the path of the electric shock current of the range with a terminal. 1--Chassis, 2--Macnetron, 3--Isolation transformer, 6--Primary coil, 7--Secondary human body , 2o...Power source, 21...--One end of the power source that is grounded, 2
7: Sharp; Tsuji, 28: Edge of insulating paper. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 'l Figure 2 Figure 5 Sankan distance #l Resentment Figure 6 Figure 7

Claims (4)

【特許請求の範囲】[Claims] （１）絶縁トランスの高圧２次側の一端をコアーに直結
し、高圧２次コイルと低圧の電源側の１次コイルを分割
し、この間に前記コアーに直結した金属板を設けると共
に、前記金属板と前記高圧２次コイルの距離を前記高圧
２次コイルと前記１次コイルの距離よりも短くし、かつ
、前記１次コイルは前記コアーより二重絶縁した構成と
する高周波加熱装置用高圧トランス。(1) One end of the high-voltage secondary side of the isolation transformer is directly connected to the core, the high-voltage secondary coil and the primary coil on the low-voltage power supply side are separated, and a metal plate directly connected to the core is provided between them, and the metal plate is connected directly to the core. A high voltage transformer for a high frequency heating device, wherein the distance between the plate and the high voltage secondary coil is shorter than the distance between the high voltage secondary coil and the primary coil, and the primary coil is double insulated from the core. . （２）金属板は、コアーの積層板の最外層の一部を切り
起こして構成した特許請求の範囲第１項記載の高周波加
熱装置用高圧トランス。(2) A high-voltage transformer for a high-frequency heating device according to claim 1, wherein the metal plate is constructed by cutting and raising a part of the outermost layer of a laminated plate of the core. （３）高圧コイルのコアーからの高さ寸法を、高圧２次
コイルと１次コイルの距離よりも小さくし、かつ、１次
コイルはコアーより二重絶縁した特許請求の範囲第１項
記載の高周波加熱装置用高圧トランス。(3) The height of the high voltage coil from the core is smaller than the distance between the high voltage secondary coil and the primary coil, and the primary coil is double insulated from the core. High voltage transformer for high frequency heating equipment. （４）高圧２次コイルに近接して、コアーに直結した金
属板を設けることにより、前記高圧２次コイルとコアー
からの実質的な高さ寸法を小さくして、小形化した特許
請求の範囲第１項記載の高周波加熱装置用高圧トランス
。(4) A claim in which the substantial height of the high-voltage secondary coil and the core from the core is reduced by providing a metal plate close to the high-voltage secondary coil and directly connected to the core. The high-voltage transformer for a high-frequency heating device according to item 1.
JP59197116A 1984-09-20 1984-09-20 High-tension transformer for high-frequency heating apparatus Pending JPS6174312A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59197116A JPS6174312A (en) 1984-09-20 1984-09-20 High-tension transformer for high-frequency heating apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59197116A JPS6174312A (en) 1984-09-20 1984-09-20 High-tension transformer for high-frequency heating apparatus

Publications (1)

Publication Number Publication Date
JPS6174312A true JPS6174312A (en) 1986-04-16

Family

ID=16368996

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59197116A Pending JPS6174312A (en) 1984-09-20 1984-09-20 High-tension transformer for high-frequency heating apparatus

Country Status (1)

Country Link
JP (1) JPS6174312A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5324527A (en) * 1976-08-18 1978-03-07 Matsushita Electric Ind Co Ltd Prevention device of electric shoc k

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5324527A (en) * 1976-08-18 1978-03-07 Matsushita Electric Ind Co Ltd Prevention device of electric shoc k

Similar Documents

Publication Publication Date Title
US6344786B1 (en) Telescoping bobbin
JP3648123B2 (en) Inverter system grounding structure
US5168422A (en) Self-enclosed neon transformer
US4031356A (en) Heat panel safety system
JPS6174312A (en) High-tension transformer for high-frequency heating apparatus
US3975653A (en) Creeping discharge and partial discharge prevention means for a coil end of a rotary electric machine
JPH0534798B2 (en)
JPS6168889A (en) High frequency heater
JP4051157B2 (en) Neon transformer ground fault detection circuit
US6177848B1 (en) High frequency snubber for transformers
JP2003510832A (en) Transformer
JPH046266B2 (en)
JPS61190910A (en) Gas insulated transformer
JPH0272587A (en) High frequency heater
CN107112114A (en) Essential safety transformer
EP1060483B1 (en) Winding transient suppression technique
JPH0720903Y2 (en) Noise shielding transformer
JPH02106008A (en) Device for limiting progress of layer short circuit of coil
JP3026859U (en) Inverter transformer
JPS5926582Y2 (en) oil-filled electrical equipment
JPS61188883A (en) High frequency heater
JPH054695Y2 (en)
JP2800441B2 (en) Insulated case with grounding part between phases
JPH0218014B2 (en)
KR200314191Y1 (en) Cabinet panel with surge cut-off transformer