JP3468186B2 - Step-up transformer device for magnetron drive - Google Patents
Step-up transformer device for magnetron driveInfo
- Publication number
- JP3468186B2 JP3468186B2 JP36987499A JP36987499A JP3468186B2 JP 3468186 B2 JP3468186 B2 JP 3468186B2 JP 36987499 A JP36987499 A JP 36987499A JP 36987499 A JP36987499 A JP 36987499A JP 3468186 B2 JP3468186 B2 JP 3468186B2
- Authority
- JP
- Japan
- Prior art keywords
- winding
- terminal
- terminal portion
- transformer
- magnetron
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
- Control Of High-Frequency Heating Circuits (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、電子レンジなどの
ようにマグネトロンを用いて誘導加熱を行う高周波加熱
装置に用いられ、主としてスイッチング電源によりマグ
ネトロンを駆動する昇圧トランス装置に関するものであ
る。
【０００２】
【従来の技術】従来、この種の装置のスイッチング電源
を用いたマグネトロン駆動用昇圧トランスは、図５に示
すように、一次巻線１と二次巻線２とヒータ巻線３が一
つの巻枠４に巻線され、Ｕ型磁性体５，６の同一軸上に
並列して置かれていた。そして、図６に示すように、一
次巻線端子部７は巻枠４の一次巻線１に隣接した巻枠鍔
部８に設けられ、高電位になる二次巻線端子部９とヒー
タ巻線端子部１０は、一次巻線１および一次巻線端子部
７との絶縁構成を考慮し、巻枠４のヒータ巻線３に隣接
した巻枠鍔部１１に設けられていた。また、高圧回路と
マグネトロンのヒータとスイッチング回路とが印刷配線
され、前記昇圧トランスを固定する印刷基盤１２には、
一次巻線端子部７と二次巻線端子部９とヒータ巻線端子
部１０を挿入する挿入孔１３が設けられ、それぞれ端子
部を挿入後、半田固定と印刷配線がなされていた。
【０００３】しかしながら、上記従来のマグネトロン駆
動用昇圧トランスは、一つの巻枠に複数の巻線を行える
と言う長所を持っているが、印刷基盤に半田固定・配線
された状態では、次のような課題があった。すなわち商
用電源に接続されているスイッチング回路に印刷配線さ
れた一次巻線端子部と、高電位になる高圧回路とマグネ
トロンのヒータに印刷配線される二次巻線端子部および
ヒータ巻線端子部とは、印刷基盤の裏面および表面で縁
面でつながっており、万一印刷基盤に塵埃の堆積、ある
いは海岸地域の塩分を含んだ空気による印刷基盤への結
露が生じると、高電位の二次巻線端子部あるいはヒータ
巻線端子部から縁面放電により一次巻線端子部へ高圧混
触になる可能性があった。
【０００４】これを防ぐため、図７に示すように印刷基
盤１４の銅箔印刷面には、一次巻線端子部７と二次巻線
端子部９およびヒータ巻線端子部１０との間に位置する
場所に、シャーシアースと同電位に印刷配線された銅箔
部１５を印刷し、高電位の二次巻線端子部９あるいはヒ
ータ巻線端子部１０からの放電を銅箔部１５に導きシャ
ーシアースへ接続して、一次巻線端子部への高圧混触を
防いでいた。また、印刷基盤１４の部品実装面には、一
次巻線端子部７と二次巻線端子部９およびヒータ巻線端
子部１０との間に位置する場所に、導電性の金属部品１
６を配置し、しかもその金属部品１６をシャーシアース
と同電位になるよう印刷配線していた。これにより高電
位の二次巻線端子部９あるいはヒータ巻線端子部１０か
らの放電を金属金具１６に導きシャーシアースへ接続し
て、一次巻線端子部への高圧混触を防いでいた。もし、
構造的に導電性の金属部品を配置できない場合は、図８
に示すように、印刷基盤１７に一次巻線端子部７と二次
巻線端子部９およびヒータ巻線端子部１０との縁面距離
を確保するためスリット１８を設けていた。これにより
高電位の二次巻線端子部９あるいはヒータ巻線端子部１
０から一次巻線端子部７までの縁面放電をスリット１８
により発生し難くしていた。
【０００５】
【発明が解決しようとする課題】しかしながら、このよ
うに印刷基盤の部品実装面での縁面放電による高電位の
二次巻線端子部あるいはヒータ巻線端子部から一次巻線
端子部への高圧混触を防ぐには、マグネトロン駆動用昇
圧トランスの一次巻線端子部と二次巻線端子部およびヒ
ータ巻線端子部との間に位置する場所に金属部品を配置
したり、あるいは印刷基盤にスリットを設ける必要があ
った。金属部品を設ける場合には、その金属部品と各巻
線間の絶縁も確保せねばならないので、マグネトロン駆
動用昇圧トランスの高さ方向が大きくなる課題を有して
いた。また、スリットを設ける場合には、一次巻線端子
部と二次巻線端子部およびヒータ巻線端子部を設ける巻
枠鍔部両端の距離即ちマグネトロン駆動用昇圧トランス
の巻枠の巻き幅方向を大きくしなければならない、また
印刷基盤にスリットを設けるので落下や振動で印刷基盤
が割れる恐れが増すと言う課題をも有していた。
【０００６】
【課題を解決するための手段】本発明は上記課題を解決
するため、昇圧トランスの第１の巻線と第２の巻線と第
３の巻線を、磁気回路を構成する磁性体に対し２つ以上
の巻枠に同心に積層して巻線し、かつ各巻枠の適所に巻
線の端子部を設けると共に巻枠の１つには磁性体に導通
接触させた磁性体アースの端子部を設け、第１の巻線の
端子部と第２の巻線および第３の巻線の端子部は磁性体
を隔てて対峙するよう配置し、前記昇圧トランスの巻線
端子部を印刷基盤に半田固定し、第１の巻線はスイッチ
ング回路に、第２の巻線と第３の巻線は高圧回路および
マグネトロンのヒータに、磁性体アースの端子部はシャ
ーシアースに接続する構成としたものである。
【０００７】上記発明によれば、万一印刷基盤に塵埃の
堆積や、あるいは海岸地域の塩分を含んだ空気による印
刷基盤への結露が生じて、高電位の高圧回路およびマグ
ネトロンのヒータに接続された第２の巻線と第３の巻線
の端子部から、スイッチング回路に接続された第１の端
子部の方向に縁面放電し易くなる状態になっても、第２
の巻線および第３の巻線の端子部は磁性体を隔てて第１
の巻線の端子部と対峙しているので、第２の巻線と第３
の巻線の端子部から磁性体に対し放電し、磁性体から磁
性体アースの端子を通じて接続されたシャーシアースに
電流が流れることになり、スイッチング回路に接続され
た第１の巻線の端子部への高圧混触を防ぐことが可能に
なる。
【０００８】従って、従来のように印刷基板上で第１の
巻線の端子部と第２の巻線および第３の巻線の端子部と
の間に位置する場所に、導電性の金属部品を配置し、し
かもその金属部品をシャーシアースと同電位になるよう
印刷配線する必要もなく、また印刷基板上に第１の巻線
の端子部と第２の巻線および第３の巻線の端子部との間
に位置する場所に、スリットを設けて縁面距離を大きく
する必要もなくなり、昇圧トランスの小型化、あるいは
印刷基板の小型化および落下振動による印刷基板の割れ
に対しても強度が増すという特徴を有している。
【０００９】言い換えると、大出力化に対しても昇圧ト
ランスを小型化できるという特徴を有しており、電源の
小型化を実現することができる。
【００１０】
【発明の実施の形態】本発明の請求項１にかかるマグネ
トロン駆動用昇圧トランス装置は、マグネトロンと、前
記マグネトロンに高圧を供給する高圧回路と、前記マグ
ネトロンのヒータと前記高圧回路に駆動電圧を供給する
昇圧トランスと、前記昇圧トランスの一次側に接続され
たスイッチング回路と、前記昇圧トランスを固定および
前記高圧回路とマグネトロンのヒータとスイッチング回
路とを印刷配線した印刷基盤とからなり、前記昇圧トラ
ンスの第１の巻線と第２の巻線と第３の巻線は磁気回路
を構成する磁性体に対し２つ以上の巻枠に同心に積層し
て巻線され、各巻枠の適所に巻線の端子部を設けると共
に巻枠の１つには前記磁性体に導通接触させた磁性体ア
ースの端子部を設け、前記第２の巻線と前記第３の巻線
の端子部から前記磁性体に対し放電することで前記スイ
ッチング回路に接続された第１の巻線の端子部への高圧
混触を防ぐべく、第１の巻線の端子部と第２の巻線およ
び第３の巻線の端子部とは磁性体を隔てて対峙するよう
配置し、かつ前記第２の巻線の端子部と前記磁性体との
空間距離が、前記第１の巻線の端子部と前記第２の巻線
の端子部との空間距離の１／２より小さく、前記第３の
巻線の端子部と前記磁性体との空間距離が、前記第１の
巻線の端子部と前記第３の巻線の端子部との空間距離の
１／２より小さい構成とし、前記昇圧トランスの巻線端
子部を印刷基盤に半田固定し、第１の巻線はスイッチン
グ回路に、第２の巻線と第３の巻線は高圧回路およびマ
グネトロンのヒータに、磁性体アースの端子部はシャー
シアースに接続する構成としたものである。
【００１１】従って、万一印刷基盤に塵埃の堆積や、あ
るいは海岸地域の塩分を含んだ空気による印刷基盤への
結露が生じて、高電位の高圧回路およびマグネトロンの
ヒータに接続された第２の巻線と第３の巻線の端子部か
ら、スイッチング回路に接続された第１の端子部の方向
に縁面放電し易くなる状態になっても、第２の巻線およ
び第３の巻線の端子部は磁性体を隔てて第１の巻線の端
子部と対峙しているので、第２の巻線と第３の巻線の端
子部から磁性体に対し放電し、磁性体から磁性体アース
の端子を通じて接続されたシャーシアースに電流が流れ
ることになり、スイッチング回路に接続された第１の巻
線の端子部への高圧混触を防ぐことができる。
【００１２】また、第２の巻線の端子部と磁性体との空
間距離が、第１の巻線の端子部と第２の巻線の端子部と
の空間距離の１／２より小さく、第３の巻線の端子部と
磁性体との空間距離が、第１の巻線の端子部と第３の巻
線の端子部との空間距離の１／２より小さい構成とした
もので、さらに高圧混触を防ぐ効果を大にするものであ
る。
【００１３】
【実施例】（実施例１）
図１は本発明のマグネトロン駆動用昇圧トランスを用い
たマグネトロン駆動用昇圧トランス装置の構成図、図２
および図３は昇圧トランスの断面構成図である。
【００１４】図１に示すように、マグネトロン駆動電源
は、マグネトロン１９と、それに倍電圧整流された高圧
倍電圧整流回路部２０と、それに昇圧電圧を供給する昇
圧トランス２１と、シャーシアース２２と、昇圧トラン
ス２１の１次側に接続されたスイッチング回路部２３
と、直流電源２４からなる。
【００１５】図２に示すように、昇圧トランス２１は、
一次巻枠２５に巻線された一次巻線２６と、二次巻枠２
７に巻かれた二次巻線２８およびヒータ巻線２９と、Ｅ
型磁性体３０，３１とからなり、主磁気回路３２に対し
同心積層に１次巻線２６と二次巻線２８およびヒータ巻
線２９が巻線されている。また図３に示すように、一次
巻枠２５には一次巻線端子部３３が、二次巻枠２７には
二次巻線端子部３４およびヒータ巻線端子部３５が設け
られており、一次巻線端子部３３と二次巻線端子部３４
およびヒータ巻線端子部３５とは、Ｅ型磁性体３１を隔
てて対峙するように配置されている。そして、Ｅ型磁性
体３１に導通接触させた磁性体アース端子部３６が設け
られている。この昇圧トランス２１は、印刷基盤３７の
挿入孔３８に、それぞれ端子部を挿入し、半田固定さ
れ、一次巻線２６がスイッチング回路部２３に、二次巻
線が高圧倍電圧整流回路部２０に、ヒータ巻線２９がマ
グネトロン１９のヒータに、Ｅ型磁性体３１の磁性体ア
ース端子部３６はシャーシアース２２に接続する構成に
成っている。
【００１６】次に動作、作用について説明すると、一次
巻枠２５には一次巻線端子部３３を、二次巻枠２７には
二次巻線端子部３４およびヒータ巻線端子部３５を設
け、一次巻線端子部３３と二次巻線端子部３４およびヒ
ータ巻線端子部３５は、Ｅ型磁性体３１を隔てて対峙す
るように配置してある。そして、Ｅ型磁性体３１に導通
接触させた磁性体アース端子部３６を設けてある。した
がって、万一印刷基盤に塵埃の堆積、あるいは海岸地域
の塩分を含んだ空気による印刷基盤への結露が生じて、
高電位の高圧倍電圧整流回路部２０のおよびマグネトロ
ン１９のヒータに接続された二次巻線端子部３４および
ヒータ巻線端子部３５から、スイッチング回路部２３に
接続された一次巻線端子部３３の方向に縁面放電し易く
なる状態になっても、一次巻線端子部３３と二次巻線端
子部３４およびヒータ巻線端子部３５の間にＥ型磁性体
３１が介在し、しかもそのＥ型磁性体３１の磁性体アー
ス端子部３６がシャーシアース２２に接続してあるの
で、二次巻線端子部３４またはヒータ巻線端子部３５か
らＥ型磁性体３１に電流が流れ、磁性体アース端子部３
６を通じてシャーシアース２２に流れ、スイッチング回
路部２３に接続された一次巻線端子部３３への高圧混触
を防ぐことになる。
【００１７】なお、本発明では一次巻線２６を外側、二
次巻線２８およびヒータ巻線２９を内側として説明した
が、当然その反対も同じであることは言うまでもない。
【００１８】また、磁性体の形状を１対のＥ型磁性体で
説明したが、１対のＥＩ型磁性体であったり、あるいは
磁性体の断面を長方形で説明したが、丸型や楕円型であ
っても、同じ端子部と磁性体の構成にすれば、効果が同
じであることも言うまでもない。
【００１９】（実施例２）
図４は本発明の実施例２のマグネトロン駆動用昇圧トラ
ンスを示す。図の説明は実施例１と同じであり、説明を
省略する。
【００２０】図４において、一次巻線端子部３３と二次
巻線端子部３４およびヒータ巻線端子部３５との空間距
離をＡ寸法とし、二次巻線端子部３４とＥ型磁性体３１
との空間距離をＢ寸法とすると、Ｂ寸法をＡ寸法の１／
２より小さく構成したものである。
【００２１】次に動作、作用について説明すると、Ｂ寸
法をＡ寸法の１／２より小さく構成したので、万一印刷
基盤に塵埃の堆積、あるいは海岸地域の塩分を含んだ空
気による印刷基盤へ結露が生じて、高電位の高圧倍電圧
整流回路部２０のおよびマグネトロン１９のヒータに接
続された二次巻線端子部３４およびヒータ巻線端子部３
５から、スイッチング回路部２３に接続された一次巻線
端子部３３の方向に縁面放電し易くなる状態になって
も、二次巻線端子部３４またはヒータ巻線端子部３５か
らＥ型磁性体３１に電流が更に流れ易くなり、磁性体ア
ース端子部３６を通じてシャーシアース２２に流れ、ス
イッチング回路部２３に接続された一次巻線端子部３３
への高圧混触を防ぐ効果を増すことになる。
【００２２】
【発明の効果】以上説明したように本発明によれば、高
電位の高圧回路およびマグネトロンのヒータに接続され
た第２の巻線と第３の巻線の端子部から、スイッチング
回路に接続された第１の端子部の方向に縁面放電し易く
なる状態になっても、第２の巻線および第３の巻線の端
子部は磁性体を隔てて第１の巻線の端子部と対峙してい
るので、第２の巻線と第３の巻線の端子部から磁性体に
対し放電し、磁性体から磁性体アースの端子を通じて接
続されたシャーシアースに電流が流れることになり、ス
イッチング回路に接続された第１の巻線の端子部への高
圧混触を防ぐ効果を有している。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a high-frequency heating apparatus for performing induction heating using a magnetron, such as a microwave oven, and mainly drives the magnetron by a switching power supply. The present invention relates to a step-up transformer device. 2. Description of the Related Art Conventionally, a step-up transformer for driving a magnetron using a switching power supply of this type of apparatus has a primary winding 1, a secondary winding 2 and a heater winding 3 as shown in FIG. It was wound around one winding frame 4 and was placed in parallel on the same axis of U-shaped magnetic bodies 5 and 6. As shown in FIG. 6, the primary winding terminal 7 is provided on a winding frame flange 8 adjacent to the primary winding 1 of the winding frame 4, and the secondary winding terminal 9 having a high potential and the heater winding The wire terminal portion 10 is provided on the winding frame flange portion 11 of the winding frame 4 adjacent to the heater winding 3 in consideration of an insulation configuration between the primary winding 1 and the primary winding terminal portion 7. Further, a high-voltage circuit, a heater of the magnetron and a switching circuit are printed and wired, and a printing board 12 for fixing the step-up transformer includes:
Insertion holes 13 into which the primary winding terminal 7, the secondary winding terminal 9, and the heater winding terminal 10 are inserted are provided, and after each terminal is inserted, solder fixing and printed wiring are performed. [0003] However, the above-mentioned conventional step-up transformer for driving a magnetron has an advantage that a plurality of windings can be formed on a single winding frame. Challenges. That is, a primary winding terminal portion printed and wired to a switching circuit connected to a commercial power supply, a secondary winding terminal portion and a heater winding terminal portion which are printed and wired to a high-voltage circuit and a magnetron heater that become high potential. Are connected at the edges on the back and front sides of the printed circuit board.If dust accumulates on the printed circuit board or dew forms on the printed circuit board due to salty air in coastal areas, a high potential secondary winding There was a possibility that high-voltage contact would occur from the wire terminal portion or the heater winding terminal portion to the primary winding terminal portion due to edge discharge. In order to prevent this, as shown in FIG. 7, the copper foil printed surface of the printed board 14 is provided between the primary winding terminal 7 and the secondary winding terminal 9 and the heater winding terminal 10. A copper foil portion 15 printed and wired at the same potential as the chassis ground is printed at a location where the electric potential from the secondary winding terminal portion 9 or the heater winding terminal portion 10 having a high potential is guided to the copper foil portion 15. It was connected to the chassis ground to prevent high voltage contact with the primary winding terminal. In addition, on the component mounting surface of the printed board 14, a conductive metal component 1 is provided at a location between the primary winding terminal 7, the secondary winding terminal 9, and the heater winding terminal 10.
6 and the metal parts 16 are printed and wired so as to have the same potential as the chassis ground. As a result, the discharge from the high potential secondary winding terminal 9 or the heater winding terminal 10 is guided to the metal fitting 16 and is connected to the chassis ground, thereby preventing high-voltage contact with the primary winding terminal. if,
If the conductive metal parts cannot be arranged structurally, FIG.
As shown in (1), a slit 18 is provided in the printing board 17 to secure the edge distance between the primary winding terminal 7, the secondary winding terminal 9, and the heater winding terminal 10. Thereby, the high potential secondary winding terminal 9 or the heater winding terminal 1
The edge discharge from 0 to the primary winding terminal 7 is slit 18
Was hardly caused by the [0005] However, as described above, the high potential secondary winding terminal or the heater winding terminal to the primary winding terminal due to the edge discharge on the component mounting surface of the printed board. To prevent high-voltage contact with the magnet, place metal parts in a location between the primary winding terminal, the secondary winding terminal, and the heater winding terminal of the step-up transformer for magnetron driving, or print It was necessary to provide a slit on the base. When a metal component is provided, insulation between the metal component and each of the windings must be ensured, so that the height direction of the step-up transformer for driving the magnetron has a problem. When a slit is provided, the distance between both ends of the winding frame flange portion where the primary winding terminal portion, the secondary winding terminal portion, and the heater winding terminal portion are provided, that is, the winding width direction of the winding frame of the step-up transformer for magnetron driving. There is also a problem that the size of the print base must be increased, and the slit is provided in the print base, so that the print base may be more likely to be broken by dropping or vibration. In order to solve the above-mentioned problems, the present invention provides a step-up transformer in which a first winding, a second winding, and a third winding are connected to a magnetic circuit constituting a magnetic circuit. A magnetic body grounded with two or more winding frames concentrically laminated and wound on the body, and a terminal portion of the winding provided at an appropriate position on each winding frame, and one of the winding frames being brought into conductive contact with a magnetic material. And a terminal portion of the first winding and a terminal portion of the second winding and the third winding are arranged so as to face each other with a magnetic material therebetween, and a winding terminal portion of the step-up transformer is provided. A configuration in which the first winding is connected to a switching circuit, the second winding and the third winding are connected to a high-voltage circuit and a heater of a magnetron, and the terminal of the magnetic ground is connected to a chassis ground. It is what it was. [0007] According to the above invention, the accumulation of dust on the printing board or the dew condensation on the printing board due to the salty air in the coastal area occurs, and the printing board is connected to the high-potential high-voltage circuit and the magnetron heater. Even if the edge portion discharges easily from the terminal portions of the second and third windings toward the first terminal portion connected to the switching circuit,
And the terminal portions of the third and third windings are separated from each other by a magnetic material.
And the second winding and the third winding
The terminal of the first winding discharges from the terminal of the winding to the magnetic body, and the current flows from the magnetic body to the chassis ground connected through the terminal of the magnetic ground, and the terminal of the first winding connected to the switching circuit. It is possible to prevent high pressure contact with the Therefore, a conductive metal part is provided on a printed circuit board in a place conventionally located between the terminal of the first winding and the terminals of the second and third windings. There is no need to print and wire the metal parts so that they have the same potential as the chassis ground, and the terminal of the first winding and the terminals of the second and third windings are printed on the printed circuit board. It is no longer necessary to provide a slit in the location between the terminal and the edge to increase the edge surface distance. Has the characteristic of increasing. In other words, it has a feature that the boosting transformer can be reduced in size even when the output is increased, and the power supply can be reduced in size. A step-up transformer for driving a magnetron according to a first aspect of the present invention drives a magnetron, a high-voltage circuit for supplying a high voltage to the magnetron, a heater of the magnetron and the high-voltage circuit. A step-up transformer for supplying a voltage, a switching circuit connected to the primary side of the step-up transformer, and a printing board in which the step-up transformer is fixed and the high-voltage circuit, the heater of the magnetron and the switching circuit are printed and wired, and The first winding, the second winding, and the third winding of the step-up transformer are wound concentrically on two or more winding frames with respect to a magnetic material constituting a magnetic circuit. And a terminal of a magnetic earth which is brought into conductive contact with the magnetic material is provided on one of the winding frames, and the second winding and the third winding are provided.
By discharging the magnetic material from the terminal portion of the
High voltage to the terminal of the first winding connected to the switching circuit
In order to prevent contact, the terminal portion of the first winding and the terminal portions of the second winding and the third winding are arranged so as to face each other with a magnetic material therebetween, and the terminal of the second winding is disposed. Between the part and the magnetic material
The space distance between the terminal of the first winding and the second winding
Smaller than 1/2 of the spatial distance to the terminal part of
The spatial distance between the terminal portion of the winding and the magnetic body is the first distance.
Of the spatial distance between the terminal of the winding and the terminal of the third winding
And smaller than 1/2 configuration, the solder fixing the winding terminal portion of the step-up transformer to the print base, the first winding to the switching circuit, the second winding and the third winding high voltage circuit and a magnetron And the terminal of the magnetic earth is connected to the chassis earth. Therefore, in the unlikely event that dust accumulates on the printing board or dew forms on the printing board due to the salty air in the coastal area, the second board connected to the high-potential high-voltage circuit and the heater of the magnetron. The second winding and the third winding are connected to the first winding connected to the switching circuit from the terminal of the winding and the third winding. Since the terminal portion of the first winding faces the terminal portion of the first winding with the magnetic material interposed therebetween, the discharge from the second winding and the terminal portion of the third winding to the magnetic material causes A current flows through the chassis ground connected through the body ground terminal, and it is possible to prevent high-voltage contact with the terminal portion of the first winding connected to the switching circuit. [0012] Also, the spatial distance between the first terminal portion of the second winding and the magnetic material is smaller than half the space distance between the terminal portion of the terminal portion of the first winding second winding The spatial distance between the terminal of the third winding and the magnetic material is smaller than 1/2 of the spatial distance between the terminal of the first winding and the terminal of the third winding. This further enhances the effect of preventing high-pressure contact. (Embodiment 1) FIG. 1 is a block diagram of a magnetron driving step-up transformer device using a magnetron driving step-up transformer of the present invention, FIG.
And FIG. 3 is a cross-sectional configuration diagram of the step-up transformer. As shown in FIG. 1, the magnetron drive power supply includes a magnetron 19, a high-voltage doubler rectifier circuit unit 20 that has been doubled, a booster transformer 21 that supplies a boosted voltage thereto, and a chassis ground 22. Switching circuit unit 23 connected to the primary side of step-up transformer 21
And a DC power supply 24. As shown in FIG. 2, the step-up transformer 21 comprises:
A primary winding 26 wound on a primary winding frame 25;
7, a secondary winding 28 and a heater winding 29, and E
A primary winding 26, a secondary winding 28, and a heater winding 29 are wound concentrically around a main magnetic circuit 32. As shown in FIG. 3, the primary winding frame 25 is provided with a primary winding terminal portion 33, and the secondary winding frame 27 is provided with a secondary winding terminal portion 34 and a heater winding terminal portion 35. Winding terminal 33 and secondary winding terminal 34
The heater winding terminal portion 35 is disposed so as to face the E-shaped magnetic body 31 with a space therebetween. Further, a magnetic material ground terminal portion 36 that is brought into conductive contact with the E-type magnetic material 31 is provided. The step-up transformer 21 has terminals inserted into the insertion holes 38 of the printing board 37 and fixed by soldering. The primary winding 26 is connected to the switching circuit 23 and the secondary winding is connected to the high-voltage doubler rectifier 20. The heater winding 29 is connected to the heater of the magnetron 19, and the magnetic ground terminal 36 of the E-shaped magnetic body 31 is connected to the chassis ground 22. Next, the operation and operation will be described. The primary winding frame 25 is provided with a primary winding terminal portion 33, and the secondary winding frame 27 is provided with a secondary winding terminal portion 34 and a heater winding terminal portion 35. The primary winding terminal 33, the secondary winding terminal 34, and the heater winding terminal 35 are arranged so as to face each other with the E-shaped magnetic body 31 therebetween. Further, a magnetic body ground terminal portion 36 that is brought into conductive contact with the E-type magnetic body 31 is provided. Therefore, in the unlikely event that dust accumulates on the printing board or dew forms on the printing board due to salty air in the coastal area,
From the secondary winding terminal section 34 and the heater winding terminal section 35 connected to the heater of the high potential high voltage doubler rectifier circuit section 20 and the magnetron 19, the primary winding terminal section 33 connected to the switching circuit section 23. , The E-shaped magnetic body 31 is interposed between the primary winding terminal portion 33, the secondary winding terminal portion 34, and the heater winding terminal portion 35. Since the magnetic earth terminal portion 36 of the E-shaped magnetic material 31 is connected to the chassis ground 22, a current flows from the secondary winding terminal portion 34 or the heater winding terminal portion 35 to the E-shaped magnetic material 31, Ground terminal 3
6 to the chassis ground 22 to prevent high-voltage contact with the primary winding terminal 33 connected to the switching circuit 23. In the present invention, the primary winding 26 has been described as the outer side, and the secondary winding 28 and the heater winding 29 have been described as the inner side. However, it is needless to say that the opposite is also true. Although the shape of the magnetic material has been described as a pair of E-type magnetic materials, the shape of the magnetic material has been described as a pair of EI-type magnetic materials or the cross section of the magnetic material has been described as a rectangle, but a round shape or an elliptical shape has been described. However, needless to say, the effects are the same if the same terminal portion and magnetic material are used. FIG. 4 shows a step-up transformer for driving a magnetron according to a second embodiment of the present invention. The description of the figure is the same as that of the first embodiment, and the description is omitted. In FIG. 4, the spatial distance between the primary winding terminal portion 33, the secondary winding terminal portion 34 and the heater winding terminal portion 35 is A, and the secondary winding terminal portion 34 and the E-shaped magnetic material 31
Assuming that the spatial distance from the A is B, the B is 1 / A of the A
It is configured to be smaller than 2. Next, the operation and operation will be described. Since the dimension B is smaller than 1/2 of the dimension A, dust accumulates on the printing board or dew forms on the printing board due to the salty air in the coastal area. Occurs, and the secondary winding terminal portion 34 and the heater winding terminal portion 3 connected to the high-potential high-voltage doubler rectifier circuit portion 20 and the heater of the magnetron 19 are formed.
5, even if the edge surface discharge becomes easy in the direction of the primary winding terminal portion 33 connected to the switching circuit portion 23, the secondary winding terminal portion 34 or the heater winding terminal portion 35 causes the E-shaped magnetic material to be discharged. The current flows more easily through the body 31, flows into the chassis ground 22 through the magnetic ground terminal 36, and is connected to the primary winding terminal 33 connected to the switching circuit 23.
This will increase the effect of preventing high-pressure cross-contact to the body. As described above, according to the present invention, the switching circuit is switched from the high-voltage circuit of the high potential and the terminals of the second and third windings connected to the heater of the magnetron. The terminal portions of the second winding and the third winding are separated from each other by a magnetic material even if the surface of the first winding is easily discharged in the direction of the first terminal connected to the first winding. Discharged from the terminals of the second and third windings to the magnetic body because it faces the terminal, and current flows from the magnetic body to the chassis ground connected through the magnetic ground terminal. This has the effect of preventing high-voltage contact with the terminal of the first winding connected to the switching circuit.
【図面の簡単な説明】
【図１】本発明のマグネトロン駆動用昇圧トランス装置
の回路構成図
【図２】同実施例１における昇圧トランス装置の断面構
成図
【図３】同実施例１における昇圧トランス装置の断面構
成図
【図４】本発明の実施例２における昇圧トランス装置の
断面構成図
【図５】従来のマグネトロン駆動用昇圧トランス装置の
断面構成図
【図６】従来のマグネトロン駆動用昇圧トランス装置の
断面構成図
【図７】従来の他のマグネトロン駆動用昇圧トランス装
置の断面構成図
【図８】従来の更に他のマグネトロン駆動用昇圧トラン
ス装置の断面構成図
【符号の説明】
１９ マグネトロン
２０ 高圧倍電圧整流回路部
２１ 昇圧トランス
２２ シャーシアース
２３ スイッチング回路部
２６ 一次巻線
２８ 二次巻線
２９ ヒータ巻線
３０、３１ Ｅ型磁性体
３３ 一次巻線端子部
３４ 二次巻線端子部
３５ ヒータ巻線端子部
３６ 磁性体アース端子部
３７ 印刷基盤
３８ 挿入孔BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit configuration diagram of a step-up transformer device for driving a magnetron according to the present invention; FIG. 2 is a cross-sectional configuration diagram of a step-up transformer device according to the first embodiment; FIG. 4 is a cross-sectional view of a step-up transformer device according to a second embodiment of the present invention. FIG. 5 is a cross-sectional view of a conventional step-up transformer device for driving a magnetron. FIG. 7 is a cross-sectional view of another conventional magnetron driving step-up transformer apparatus. FIG. 8 is a cross-sectional view of another conventional magnetron drive step-up transformer apparatus. Reference Signs List 20 high voltage doubler rectifier circuit section 21 step-up transformer 22 chassis ground 23 switching circuit section 26 primary winding 28 secondary winding 29 heater windings 30, 31 E-shaped magnetic body 33 Primary winding terminal section 34 Secondary winding terminal section 35 Heater winding terminal section 36 Magnetic body ground terminal section 37 Printing board 38 Insertion hole
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 実開 平４−120220（ＪＰ，Ｕ) 実開 平４−82819（ＪＰ，Ｕ) 実開 平１−153624（ＪＰ，Ｕ) 実開 昭61−38918（ＪＰ，Ｕ) 実開 昭62−8620（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01F 30/00 H05B 6/66 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 4-120220 (JP, U) JP-A 4-82819 (JP, U) JP-A 1-153624 (JP, U) JP-A 61- 38918 (JP, U) Full-fledged Sho 62-8620 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) H01F 30/00 H05B 6/66
Claims (1)
圧を供給する高圧回路と、前記マグネトロンのヒータと
前記高圧回路に駆動電圧を供給する昇圧トランスと、前
記昇圧トランスの一次側に接続されたスイッチング回路
と、前記昇圧トランスを固定および前記高圧回路とマグ
ネトロンのヒータとスイッチング回路とを印刷配線した
印刷基盤とからなり、前記昇圧トランスの第１の巻線と
第２の巻線と第３の巻線は磁気回路を構成する磁性体に
対し２つ以上の巻枠に同心に積層して巻線され、各巻枠
の適所に巻線の端子部を設けると共に巻枠の１つには前
記磁性体に導通接触させた磁性体アースの端子部を設
け、前記第２の巻線と前記第３の巻線の端子部から前記
磁性体に対し放電することで前記スイッチング回路に接
続された第１の巻線の端子部への高圧混触を防ぐべく、
第１の巻線の端子部と第２の巻線および第３の巻線の端
子部とは磁性体を隔てて対峙するよう配置し、かつ前記
第２の巻線の端子部と前記磁性体との空間距離が、前記
第１の巻線の端子部と前記第２の巻線の端子部との空間
距離の１／２より小さく、前記第３の巻線の端子部と前
記磁性体との空間距離が、前記第１の巻線の端子部と前
記第３の巻線の端子部との空間距離の１／２より小さい
構成とし、前記昇圧トランスの巻線端子部を印刷基盤に
半田固定し、第１の巻線はスイッチング回路に、第２の
巻線と第３の巻線は高圧回路およびマグネトロンのヒー
タに、磁性体アースの端子部はシャーシアースに接続し
たマグネトロン駆動用昇圧トランス装置。(57) [Claim 1] A magnetron, a high voltage circuit for supplying a high voltage to the magnetron, a step-up transformer for supplying a drive voltage to a heater of the magnetron and the high voltage circuit, and a step-up transformer for the step-up transformer A switching circuit connected to the primary side, and a printed circuit board on which the step-up transformer is fixed and the high-voltage circuit, the heater of the magnetron and the switching circuit are printed and wired, and the first winding and the second winding of the step-up transformer are formed. The winding and the third winding are wound concentrically on two or more winding frames with respect to the magnetic material constituting the magnetic circuit, and a winding terminal portion is provided at an appropriate position on each winding frame. One is provided with a magnetic earth terminal portion that is brought into conductive contact with the magnetic material, and the terminal portion of the second winding and the third winding is
By connecting to the switching circuit by discharging the magnetic material
In order to prevent the high voltage contact with the terminal part of the connected first winding,
The terminal portion of the first winding and the terminal portions of the second winding and the third winding are arranged so as to face each other with a magnetic material therebetween, and
The spatial distance between the terminal portion of the second winding and the magnetic body is
Space between the terminal portion of the first winding and the terminal portion of the second winding
Less than half of the distance between the terminal of the third winding and
The spatial distance between the magnetic body and the terminal of the first winding is
Smaller than half the spatial distance between the third winding and the terminal portion
Configuration and then solder to secure the winding terminal portion of the step-up transformer to the print base, the first winding to the switching circuit, the second winding and the third winding to the heater of the high voltage circuit and a magnetron, a magnetic The terminal of the body ground is a step-up transformer device for driving the magnetron connected to the chassis ground.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36987499A JP3468186B2 (en) | 1999-12-27 | 1999-12-27 | Step-up transformer device for magnetron drive |
| PCT/JP2000/003892 WO2000078100A1 (en) | 1999-06-15 | 2000-06-15 | Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| EP00939070A EP1106036B1 (en) | 1999-06-15 | 2000-06-15 | Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| US09/762,791 US6449178B1 (en) | 1999-06-15 | 2000-06-15 | Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| DE60004311T DE60004311T2 (en) | 1999-06-15 | 2000-06-15 | CONTROL ELEMENTS OF AN INCREASE TRANSFORMER IN A MAGNETRON AND SUPPLY CURRENT CONTROL DEVICES FROM A TRANSFORMER IN A MAGNETRON |
| KR1020017001868A KR100625785B1 (en) | 1999-06-15 | 2000-06-15 | Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| AU54267/00A AU772157B2 (en) | 1999-06-15 | 2000-06-15 | Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| CNB008012601A CN1199207C (en) | 1999-06-15 | 2000-06-15 | Magnetron drive step-up transformer and transformer of magnetron drive power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36987499A JP3468186B2 (en) | 1999-12-27 | 1999-12-27 | Step-up transformer device for magnetron drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001185429A JP2001185429A (en) | 2001-07-06 |
| JP3468186B2 true JP3468186B2 (en) | 2003-11-17 |
Family
ID=18495531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36987499A Expired - Fee Related JP3468186B2 (en) | 1999-06-15 | 1999-12-27 | Step-up transformer device for magnetron drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3468186B2 (en) |
-
1999
- 1999-12-27 JP JP36987499A patent/JP3468186B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001185429A (en) | 2001-07-06 |
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