JPH1027720A - Voltage boosting transformer for high frequency heat-cooking apparatus - Google Patents
Voltage boosting transformer for high frequency heat-cooking apparatusInfo
- Publication number
- JPH1027720A JPH1027720A JP8183014A JP18301496A JPH1027720A JP H1027720 A JPH1027720 A JP H1027720A JP 8183014 A JP8183014 A JP 8183014A JP 18301496 A JP18301496 A JP 18301496A JP H1027720 A JPH1027720 A JP H1027720A
- Authority
- JP
- Japan
- Prior art keywords
- winding
- heater
- transformer
- magnetron
- secondary winding
- 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
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)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、マグネトロン発振
によるマイクロ波加熱を利用して加熱調理を行う高周波
加熱調理器用昇圧トランス構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step-up transformer structure for a high-frequency heating cooker for performing cooking using microwave heating by magnetron oscillation.
【０００２】[0002]
【従来の技術】以下に従来の高周波加熱調理器用昇圧ト
ランスについて、図３、図４に基づいて説明する。2. Description of the Related Art A conventional step-up transformer for a high-frequency heating cooker will be described below with reference to FIGS.
【０００３】商用電源を整流して得られる単方向電源７
と、スイッチングによって発生するノイズが、電源ライ
ンに重畳されることを防止する機能を持つ平滑回路を含
むインバータ回路８は、マグネトロン１１へ高電圧を印
加する昇圧トランス１０の１次巻線１に接続されてい
る。昇圧トランス１０は１次巻線１、２次巻線２、ヒー
タ巻線３、コア４、巻線固定用のボビン５からなり、コ
ア４はＵ字型を突き合わせる構造になっており、さらに
磁束漏洩用のギャップ６が設けられている。昇圧トラン
ス１０の２次巻線２は、巻線間の耐圧を高めるために巻
線固定用のボビン５によって複数にほぼ均等分割されて
いる。２次巻線出力は、コンデンサとダイオードによっ
て倍電圧整流回路として構成され、マグネトロン１１に
接続されている。また、ヒータ巻線出力はマグネトロン
１１のカソード１２に接続される。A unidirectional power supply 7 obtained by rectifying a commercial power supply
And an inverter circuit 8 including a smoothing circuit having a function of preventing noise generated by switching from being superimposed on a power supply line, connected to a primary winding 1 of a step-up transformer 10 for applying a high voltage to a magnetron 11. Have been. The step-up transformer 10 includes a primary winding 1, a secondary winding 2, a heater winding 3, a core 4, and a bobbin 5 for fixing the winding. The core 4 has a U-shaped butted structure. A gap 6 for magnetic flux leakage is provided. The secondary winding 2 of the step-up transformer 10 is substantially equally divided into a plurality of parts by a winding fixing bobbin 5 in order to increase the breakdown voltage between the windings. The secondary winding output is formed as a voltage doubler rectifier circuit by a capacitor and a diode, and is connected to the magnetron 11. The heater winding output is connected to the cathode 12 of the magnetron 11.
【０００４】以上の構成で、高周波加熱時にはインバー
タ回路８のスイッチング素子９をオンオフすることによ
って、昇圧トランス１０の１次巻線１に電流が流れ、発
生した高周波磁束の大部分はコア４を通り、２次側に約
２ｋＶの高電圧を誘起させ、さらにコンデンサとダイオ
ードによって倍電圧整流され、マグネトロン１１に約４
ｋＶの高電圧を印加すると同時に、ヒータ巻線３に十数
アンペアの電流を流し、マグネトロンカソード１２を適
正温度範囲（１９００〜２１００Ｋ）の中で約２０００
Ｋまで加熱しエミッションを可能にすることと、コア４
に設けられた磁束漏洩用のギャップ６によって、２次側
から見た１次側のインピーダンスを高くして昇圧トラン
ス１０に定電流特性を持たせることによって、安定にマ
イクロ波を発生させるものである。In the above configuration, during high-frequency heating, by switching on and off the switching element 9 of the inverter circuit 8, current flows through the primary winding 1 of the step-up transformer 10, and most of the generated high-frequency magnetic flux passes through the core 4. A high voltage of about 2 kV is induced on the secondary side, and the voltage is doubled by a capacitor and a diode.
At the same time as applying a high voltage of kV, a current of tens of amperes is passed through the heater winding 3 to bring the magnetron cathode 12 to a temperature of about 2,000 in an appropriate temperature range (1900 to 2100K).
Heating to K to enable emissions and core 4
The microwaves are generated stably by increasing the impedance on the primary side as viewed from the secondary side by the gap 6 for magnetic flux leakage provided in the step-up transformer and giving the step-up transformer 10 a constant current characteristic. .
【０００５】[0005]
【発明が解決しようとする課題】このような従来の昇圧
トランスを用いた高周波加熱調理器では、マグネトロン
に備えられている永久磁石が作る磁界は、カソードから
アノードに向かって放出される電子に対して垂直方向に
作用し、電子に旋回運動を与えるものである。マグネト
ロンの入出力は約７０％の効率であるため、アノードは
２００℃近くまで温度が上昇し、これに伴って永久磁石
が作る磁界が小さくなる。ここでマグネトロンは図５に
示すような電圧電流特性をもっているため、アノード電
圧が低下し昇圧トランスの２次巻線出力も小さくなる。
１ターンで構成されているヒータ巻線は、１次巻線だけ
でなく２次巻線とも結合しているため、２次巻線出力が
小さくなればヒータ巻線の出力も小さくなり、時間経過
によるアノード温度上昇とともに起動時約２０００Ｋの
カソード温度が下がり、カソードのエミッションが可能
な適正温度範囲からはずれてしまい、モーディングと言
われる異常発振が発生し易くなる。ここで、ヒータ巻線
を２ターンにした場合、カソードに与える電力が大幅に
大きくなって、起動時において適正温度の上限２１００
Ｋを超えてしまうため、ヒータ巻線数は１ターンにせざ
るを得ないという課題を有しているものである。In such a conventional high-frequency heating cooker using a step-up transformer, the magnetic field generated by the permanent magnet provided in the magnetron is less than the electron emitted from the cathode toward the anode. Acting in the vertical direction to impart a swirling motion to the electrons. Since the input and output of the magnetron is about 70% efficient, the temperature of the anode rises to near 200 ° C., and the magnetic field created by the permanent magnet decreases accordingly. Here, since the magnetron has the voltage-current characteristics as shown in FIG. 5, the anode voltage decreases and the secondary winding output of the step-up transformer also decreases.
Since the heater winding composed of one turn is coupled not only to the primary winding but also to the secondary winding, if the output of the secondary winding is reduced, the output of the heater winding is also reduced, and time elapses. As the anode temperature rises, the cathode temperature at the time of startup decreases by about 2000 K, and the temperature falls out of an appropriate temperature range in which the cathode can be emitted, so that abnormal oscillation called moding easily occurs. Here, when the heater winding has two turns, the electric power applied to the cathode is greatly increased, and the upper limit of the appropriate temperature 2100 at the time of startup is increased.
Since the temperature exceeds K, the number of turns of the heater must be reduced to one turn.
【０００６】本発明は上記従来の問題点を解決するもの
で、マイクロ波発生時間の経過とともにマグネトロンの
アノード温度が上昇して２次巻線出力が低下しても、ヒ
ータ電力を変動させずにモーディングの発生を抑える高
周波調理器用昇圧トランスを提供することを目的として
いる。The present invention solves the above-mentioned conventional problems. Even if the temperature of the anode of the magnetron rises and the output of the secondary winding decreases with the passage of microwave generation time, the heater power is not changed. An object of the present invention is to provide a step-up transformer for a high-frequency cooker that suppresses the occurrence of moding.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
に本発明の高周波加熱調理器用昇圧トランスは、数百タ
ーンからなる２次巻線を巻線固定用のボビンによって複
数に分割し、さらにヒータ巻線に近い領域の巻線数を他
の領域の巻線数に比べて少なくなるようにして、ヒータ
巻線と２次巻線との磁気結合を小さくすることによっ
て、ヒータ巻線と１次巻線との結合度を相対的に向上さ
せ、マグネトロン発熱時の２次巻線出力電圧の低下に対
して、ヒータ巻線に発生する電力の変動を抑えたもので
ある。In order to solve the above-mentioned problems, a step-up transformer for a high-frequency heating cooker according to the present invention divides a secondary winding having several hundred turns into a plurality of parts by a winding fixing bobbin. By reducing the number of turns in the area close to the heater winding compared to the number of turns in the other areas to reduce the magnetic coupling between the heater winding and the secondary winding, the number of turns of the heater winding is reduced. The degree of coupling with the secondary winding is relatively improved, and fluctuations in the power generated in the heater winding are suppressed in response to a decrease in the secondary winding output voltage during magnetron heating.
【０００８】[0008]
【発明の実施の形態】請求項１記載の発明は、昇圧トラ
ンスの１次巻線に電流を流した際にコアに発生する磁束
は、２次巻線に比べてヒータ巻線とより多く交番するた
め、ヒータ巻線と２次巻線との磁気結合が小さくなり、
ヒータ巻線と１次巻線の磁気結合度が相対的に向上する
ことになる。したがって、マグネトロンの発熱によって
アノード電圧が小さくなった場合でも、ヒータに与える
電力の低下が緩和され、カソード温度の変動が抑えられ
るため、モーディングが起こりにくくなるので、高周波
加熱調理器の安全性、信頼性を向上させることができる
ものである。DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, when a current flows through a primary winding of a step-up transformer, a magnetic flux generated in a core alternately increases with a heater winding as compared with a secondary winding. Therefore, the magnetic coupling between the heater winding and the secondary winding is reduced,
The degree of magnetic coupling between the heater winding and the primary winding is relatively improved. Therefore, even when the anode voltage decreases due to the heat generated by the magnetron, the reduction in the power applied to the heater is reduced, and the fluctuation in the cathode temperature is suppressed, so that moding is less likely to occur. The reliability can be improved.
【０００９】請求項２記載の発明は、昇圧トランスの１
次巻線で発生する磁束のうち、ヒータ巻線の内側を通る
磁束が増加するため、定常時においてカソードに与える
電力を増加させることができ、例えばファンロック等の
異常によってアノード温度が急激に上昇して２次巻線出
力が大幅に低下しても、モーディングが起こりにくくす
ることができるものである。According to a second aspect of the present invention, there is provided a step-up transformer.
Of the magnetic flux generated in the next winding, the magnetic flux passing through the inside of the heater winding increases, so that the power applied to the cathode in a steady state can be increased. For example, the anode temperature rises rapidly due to an abnormality such as fan lock. Thus, even if the output of the secondary winding is greatly reduced, the moding can be made difficult to occur.
【００１０】[0010]
（実施例１）以下本発明の第一の実施例について図面を
参照しながら説明する。図１（ａ）において、昇圧トラ
ンス１０は１次巻線１、２次巻線２１、ヒータ巻線３、
コア４、巻線固定用のボビン５からなり、コア４は２個
のＵ字型コアを突き合わせると同時に、磁束漏洩用とし
て約２ｍｍのギャップ６を構成している。それぞれの巻
線は巻線固定用のボビンによって、コア４の長手方向に
１次側、２次側、ヒータ巻線用に配置され、特にヒータ
巻線３を１次巻線１と２次巻線２１で挟むように並べら
れている。なお、２次側は耐圧を高くするために複数領
域に分割され、ヒータ巻線３に最も近い領域の巻線数を
他の領域の巻線数に比べて少なくなるように構成する。(Embodiment 1) A first embodiment of the present invention will be described below with reference to the drawings. In FIG. 1A, a step-up transformer 10 includes a primary winding 1, a secondary winding 21, a heater winding 3,
The core 4 comprises a bobbin 5 for fixing the windings. The core 4 abuts two U-shaped cores and forms a gap 6 of about 2 mm for magnetic flux leakage. The respective windings are arranged by a bobbin for fixing the windings in the longitudinal direction of the core 4 on the primary side, the secondary side, and the heater winding. In particular, the heater winding 3 is connected to the primary winding 1 and the secondary winding. They are arranged so as to be sandwiched by the line 21. The secondary side is divided into a plurality of regions in order to increase the breakdown voltage, and the number of windings in a region closest to the heater winding 3 is configured to be smaller than the number of windings in other regions.
【００１１】上記の様に構成された高周波加熱調理器用
昇圧トランスについて、以下にその動作を説明する。被
加熱物をマイクロ波加熱する場合、インバータ回路８の
スイッチング素子９をオンオフさせて１次巻線１に高周
波電流を流すことで高周波磁界を発生させる。発生した
磁束の大部分はコアを通りヒータ巻線３、２次巻線２１
と交番し、２次側に約２ｋＶの高電圧を誘起させ、さら
にコンデンサとダイオードによって倍電圧整流され、マ
グネトロン１１に約４ｋＶの高電圧を印加すると同時
に、ヒータ巻線２に十数アンペアの電流を流し、マグネ
トロン１１のカソード１２を約２０００Ｋの適正温度ま
で加熱する。但し、マグネトロン１１の入出力効率は約
７０％であり、残りの３０％は損失としてマグネトロン
１１自身を発熱させるため、時間経過とともにアノード
温度が上昇し、永久磁石の磁界を弱めるので、２次巻線
２１、ヒータ巻線３の出力が小さくなっていく。しか
し、２次巻線の均等分割の場合に比べて、２次巻線２１
とヒータ巻線３の磁気結合度が小さいため、図１（ｂ）
に示すようにアノード温度が上昇して２次巻線２１の出
力が低下しても、ヒータ巻線３の出力低下を小さく抑え
ることができる。したがって、カソード１２に与える電
力の変動を小さくすることができ、安定したカソード１
２のエミッションを得ることができる。The operation of the step-up transformer for a high-frequency heating cooker constructed as described above will be described below. When microwave heating the object to be heated, a high-frequency magnetic field is generated by turning on / off the switching element 9 of the inverter circuit 8 and flowing a high-frequency current through the primary winding 1. Most of the generated magnetic flux passes through the core, the heater winding 3, the secondary winding 21
Alternately, a high voltage of about 2 kV is induced on the secondary side, the voltage is rectified by a capacitor and a diode, and a high voltage of about 4 kV is applied to the magnetron 11. To heat the cathode 12 of the magnetron 11 to an appropriate temperature of about 2000K. However, the input / output efficiency of the magnetron 11 is about 70%, and the remaining 30% causes the magnetron 11 itself to generate heat as a loss, so that the anode temperature rises with time and the magnetic field of the permanent magnet is weakened. The output of the wire 21 and the heater winding 3 decreases. However, compared to the case of the equal division of the secondary winding, the secondary winding 21
1 (b) because the degree of magnetic coupling between the heater coil 3 and
As shown in (2), even when the anode temperature rises and the output of the secondary winding 21 decreases, the decrease in the output of the heater winding 3 can be kept small. Therefore, the fluctuation of the power applied to the cathode 12 can be reduced, and the stable cathode 1
2 emissions can be obtained.
【００１２】以上の様に本実施例によれば、昇圧トラン
スの形状を大きくすることなく、１次巻線１と２次巻線
２１との磁気結合度を小さくして、１次巻線１とヒータ
巻線３の磁気結合度を相対的に向上させて、マグネトロ
ン１１のアノード温度に対して依存性の少ないヒータ電
力を確保することができるため、モーディングを起こし
にくくすることが可能となる、高周波調理器用昇圧トラ
ンスを実現することができる。As described above, according to this embodiment, the degree of magnetic coupling between the primary winding 1 and the secondary winding 21 is reduced without increasing the shape of the step-up transformer. And the degree of magnetic coupling between the heater coil 3 and the heater coil 3 can be relatively improved, and heater power that is less dependent on the anode temperature of the magnetron 11 can be secured. Thus, a step-up transformer for a high-frequency cooker can be realized.
【００１３】（実施例２）以下本発明の第二の実施例に
ついて図面を参照しながら説明する。図２（ａ）におい
て図１（ａ）の構成と異なるのは、昇圧トランス１０の
ヒータ巻線３１の内径を１次巻線１の外径よりも大きく
するような構成とした点である。上記以外の構成要素は
第一の実施例と同等であり説明を省略する。(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. 2A is different from the configuration of FIG. 1A in that the heater winding 31 of the step-up transformer 10 has an inner diameter larger than the outer diameter of the primary winding 1. Components other than the above are the same as those in the first embodiment, and a description thereof will be omitted.
【００１４】上記の様に構成された高周波加熱調理器用
昇圧トランスについて、以下にその動作を説明する。本
実施例では、１次巻線１に電流を流すことよって発生す
る磁束の多くはコア４を介してヒータ巻線３１と交番す
るが、ヒータ巻線３１の内径を１次巻線１の外径に比べ
て大きくすることによって、コア４に設けられたギャッ
プ６の効果からコア４の外部に漏洩する磁束の一部につ
いてもヒータ巻線３１内を通すことが可能になるため、
１次巻線１とヒータ巻線３１との磁気結合度を上げるこ
とになり、ヒータ巻線３１に誘起される出力電圧も大き
くすることができる。The operation of the step-up transformer for a high-frequency heating cooker constructed as described above will be described below. In the present embodiment, most of the magnetic flux generated by passing a current through the primary winding 1 alternates with the heater winding 31 via the core 4, but the inner diameter of the heater winding 31 is outside the primary winding 1. By making the diameter larger than the diameter, a part of the magnetic flux leaking to the outside of the core 4 can pass through the heater winding 31 due to the effect of the gap 6 provided in the core 4.
Since the degree of magnetic coupling between the primary winding 1 and the heater winding 31 is increased, the output voltage induced on the heater winding 31 can be increased.
【００１５】以上の様に本実施例によれば、巻数を増や
すことなくヒータ電力を増加させ、図２（ｂ）に示すよ
うに、マグネトロン起動時のカソード温度を、適正温度
の上限である２１００Ｋに近づけることができるため、
カソード温度の適正温度範囲を上限から下限まで広く使
用することが可能となり、時間経過によるマグネトロン
１１の発熱に起因するヒータ電力の低下を許容できるの
で、例えばファンロック等の異常によってアノード温度
が急激に上昇して２次巻線出力が大幅に低下しても、モ
ーディング発生をより起こしにくい高周波加熱調理器用
昇圧トランスを提供することが可能である。As described above, according to the present embodiment, the heater power is increased without increasing the number of turns, and as shown in FIG. 2B, the cathode temperature at the time of starting the magnetron is reduced to 2100 K, which is the upper limit of the appropriate temperature. Can be approached,
The appropriate temperature range of the cathode temperature can be widely used from the upper limit to the lower limit, and a decrease in the heater power due to the heat generation of the magnetron 11 with the passage of time can be tolerated. It is possible to provide a step-up transformer for a high-frequency heating cooker that is less likely to cause moding even when the output of the secondary winding is increased and the output of the secondary winding is significantly reduced.
【００１６】[0016]
【発明の効果】以上のように、請求項１記載の発明によ
れば、昇圧トランスの１次巻線に電流を流した際にコア
に発生する磁束は、２次巻線に比べてヒータ巻線とより
多く交番するため、ヒータ巻線と２次巻線との磁気結合
が小さくなり、マグネトロンの発熱によってアノード電
圧及び２次巻線出力電圧が小さくなった場合でも、ヒー
タに与える電力が低下しにくくなり、カソード温度の変
動が抑えられるため、モーディングを起こりにくくする
ことができる。As described above, according to the first aspect of the present invention, when a current flows through the primary winding of the step-up transformer, the magnetic flux generated in the core is smaller than that of the secondary winding by the heater winding. Since the number of turns alternates with the number of wires, the magnetic coupling between the heater winding and the secondary winding decreases, and even when the anode voltage and the output voltage of the secondary winding decrease due to the heat generated by the magnetron, the power supplied to the heater decreases. And the fluctuation of the cathode temperature is suppressed, so that the moding can be made less likely to occur.
【００１７】また、請求項２記載の発明によれば、昇圧
トランスの１次巻線で発生する磁束のうち、漏洩磁束の
一部についてもヒータ巻線の内側を通すことにより、定
常時においてカソードに与える電力を増加させることが
できるので、例えばファンロック等の異常によってアノ
ード温度が急激に上昇して２次巻線出力が大幅に低下し
ても、モーディングが起こりにくくなることで、より装
置の安全性、信頼性を高めることができる。According to the second aspect of the present invention, of the magnetic flux generated in the primary winding of the step-up transformer, a part of the leakage magnetic flux also passes through the inside of the heater winding, so that the cathode can be operated in a steady state. Power can be increased, for example, even if the anode temperature rises rapidly due to an abnormality such as fan lock and the secondary winding output drops significantly, moding is less likely to occur, and the device becomes more difficult. Safety and reliability can be improved.
【図１】（ａ）は、本発明の第一の実施例における高周
波加熱調理器用昇圧トランスの断面図 （ｂ）は、同、高周波加熱調理器用昇圧トランスのマグ
ネトロンのアノード温度とカソード温度との関係図FIG. 1A is a cross-sectional view of a step-up transformer for a high-frequency heating cooker according to a first embodiment of the present invention. FIG. 1B is a diagram showing the relationship between the anode temperature and the cathode temperature of the magnetron of the step-up transformer for the high-frequency heating cooker. Relationship diagram
【図２】（ａ）は、本発明の第二の実施例における高周
波加熱調理器用昇圧トランスの断面図 （ｂ）は、同、高周波加熱調理器用昇圧トランスのマグ
ネトロンのアノード温度とカソード温度との関係図FIG. 2A is a sectional view of a step-up transformer for a high-frequency heating cooker according to a second embodiment of the present invention; FIG. 2B is a sectional view of the anode temperature and the cathode temperature of the magnetron of the step-up transformer for the high-frequency cooker; Relationship diagram
【図３】従来例の高周波加熱調理器用昇圧トランスの断
面図FIG. 3 is a sectional view of a conventional step-up transformer for a high-frequency heating cooker.
【図４】一般的な高周波加熱調理器用制御装置の回路図FIG. 4 is a circuit diagram of a control device for a general high-frequency heating cooker.
【図５】同、高周波加熱調理器用制御装置のマグネトロ
ンの電圧電流特性図FIG. 5 is a diagram showing a voltage-current characteristic of a magnetron of the control device for a high-frequency heating cooker.
１ １次巻線 ２１ ２次巻線 ３１ ヒータ巻線 ４ コア ５ ボビン ６ ギャップ ７ 単方向電源 ８ インバータ回路 ９ スイッチング素子 １０ 昇圧トランス １１ マグネトロン １２ カソード DESCRIPTION OF SYMBOLS 1 Primary winding 21 Secondary winding 31 Heater winding 4 Core 5 Bobbin 6 Gap 7 Unidirectional power supply 8 Inverter circuit 9 Switching element 10 Step-up transformer 11 Magnetron 12 Cathode
───────────────────────────────────────────────────── フロントページの続き (72)発明者 河野 一典 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazunori Kono 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.
Claims (2)
と、スイッチング素子、共振コンデンサ、及び平滑回路
を有するインバータ回路と、高周波磁界を発生させる１
次巻線、磁束を通すコア、マグネトロンに高電圧を印加
する２次巻線、及びマグネトロンのカソードに電力を与
えるヒータ巻線を有する昇圧トランスとを備え、前記昇
圧トランスの２次巻線は、巻線固定用のボビンによって
コアの長手方向に複数領域に分割され、ヒータ巻線に近
い領域の巻線数を他の領域の巻線数に比べて少なくして
なる高周波加熱調理器用昇圧トランス。1. A unidirectional power supply obtained by rectifying a commercial power supply, an inverter circuit having a switching element, a resonance capacitor, and a smoothing circuit, and a high-frequency magnetic field is generated.
A secondary winding for applying a high voltage to the magnetron, and a booster transformer having a heater winding for supplying power to the cathode of the magnetron, and the secondary winding of the booster transformer includes: A step-up transformer for a high-frequency heating cooker, which is divided into a plurality of regions in the longitudinal direction of a core by a winding fixing bobbin, and has a smaller number of windings in a region close to the heater winding than in other regions.
比べて大きくしてなる請求項１記載の高周波加熱調理器
用昇圧トランス。2. The step-up transformer for a high-frequency heating cooker according to claim 1, wherein the inner diameter of the heater winding is larger than the outer diameter of the primary winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8183014A JPH1027720A (en) | 1996-07-12 | 1996-07-12 | Voltage boosting transformer for high frequency heat-cooking apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8183014A JPH1027720A (en) | 1996-07-12 | 1996-07-12 | Voltage boosting transformer for high frequency heat-cooking apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1027720A true JPH1027720A (en) | 1998-01-27 |
Family
ID=16128237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8183014A Pending JPH1027720A (en) | 1996-07-12 | 1996-07-12 | Voltage boosting transformer for high frequency heat-cooking apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1027720A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6956456B2 (en) * | 2002-03-12 | 2005-10-18 | Matsushita Electric Industrial Co., Ltd. | Magnetron drive boosting transformer |
| US7535331B2 (en) | 2003-04-15 | 2009-05-19 | Panasonic Corporation | Booster transformer for driving magnetron and transformer unit having the booster transformer |
-
1996
- 1996-07-12 JP JP8183014A patent/JPH1027720A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6956456B2 (en) * | 2002-03-12 | 2005-10-18 | Matsushita Electric Industrial Co., Ltd. | Magnetron drive boosting transformer |
| US7535331B2 (en) | 2003-04-15 | 2009-05-19 | Panasonic Corporation | Booster transformer for driving magnetron and transformer unit having the booster transformer |
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