JPS63318091A - High-frequency heating device - Google Patents

High-frequency heating device

Info

Publication number
JPS63318091A
JPS63318091A JP15385687A JP15385687A JPS63318091A JP S63318091 A JPS63318091 A JP S63318091A JP 15385687 A JP15385687 A JP 15385687A JP 15385687 A JP15385687 A JP 15385687A JP S63318091 A JPS63318091 A JP S63318091A
Authority
JP
Japan
Prior art keywords
circuit
magnetron
voltage
switching element
inverter
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.)
Granted
Application number
JP15385687A
Other languages
Japanese (ja)
Other versions
JPH0569273B2 (en
Inventor
Takatomo Matsumi
松實 孝友
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP15385687A priority Critical patent/JPS63318091A/en
Publication of JPS63318091A publication Critical patent/JPS63318091A/en
Publication of JPH0569273B2 publication Critical patent/JPH0569273B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE:To eliminate the deterioration of a semiconductor switching element in an automatic restarting method by detecting the abnormal operation of a magnetron driving circuit and a magnetron, and stopping the operation of an inverter circuit for a specific time after detecting the abnormal operation. CONSTITUTION:The collector voltage of a switching element 105 can be detected from the output voltage of an auxiliary winding 9, and the collector current of the switching element 105 can be detected by inputting the anode current of a magnetron from a high voltage secondary winding of a magnetron driving transformer 104 to an abnormality detecting circuit 109. It is determined whether the switching element 105 is within the safety operation area or not from the two inputs, and when the abnormality detecting circuit 109 is decided to exceed the safety area, an inverter protective circuit 110 is operated and the damping of the resonance voltage is started. In this case, after a specific time passes, the heating device is restarted. Therefore, since the collector voltage is lower than the clamp voltage of a damper diode 106 or the power supply voltage, the switching element 105 is never broken, and it can be restarted automatically.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 この発明は電子レンジ等のいわゆる誘電加熱を行うだめ
の高周波加熱装置の改良に関し、さらに詳しく述べれば
、その電源装置にインバータ回路を用い、インバータ回
路により高周波電力を発生し、昇圧トランスにて昇圧し
てマグネトロンを駆動するよう構成した高周波加熱装置
の改良に関するものである。
[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to the improvement of a high-frequency heating device for performing so-called dielectric heating such as a microwave oven. This invention relates to an improvement of a high-frequency heating device configured to generate high-frequency power using a circuit, boost the voltage using a step-up transformer, and drive a magnetron.

〈従来の技術〉 従来、この種の高周波加熱装置においてはインバータ回
路の負荷の異常、すなわちマグネトロンのモーディング
現象(空間電荷波の周期が乱れ、アノード臨界電圧が跳
躍するフィラメントエミ7ヨンが不足した時及びマグネ
トロンの負荷状態が異常の時に起こる。)による過大々
共振電圧の発生、或はマグネトロン駆動用変圧器のコア
の磁気飽和や高圧ダイオードの短絡による過大な電流の
発生を検出した場合インバ〜り回路、特に半導体スイッ
チング素子を保護する為に次の2つの方式がとられてい
る。1つはインバータ回路を含めてシステム全体をリセ
ツトしてしまい手動による再スタートを行なわせる方式
。もう1つはインバータ回路を停止させ、一定時間後に
共振電圧の位相の如何にかかわらず自動再スタートさせ
る方式である。
<Prior art> Conventionally, this type of high-frequency heating device has been used to detect abnormalities in the load of the inverter circuit, that is, the moding phenomenon of the magnetron (the period of the space charge wave is disturbed, and the anode critical voltage jumps due to insufficient filament emitters). (This occurs when the load condition of the magnetron is abnormal.) or the occurrence of an excessive current due to magnetic saturation of the core of the magnetron drive transformer or short circuit of a high voltage diode. The following two methods are used to protect circuits, especially semiconductor switching elements. One method is to reset the entire system, including the inverter circuit, and restart it manually. The other method is to stop the inverter circuit and restart it automatically after a certain period of time regardless of the phase of the resonant voltage.

〈発明が解決しようとする問題点〉 しかしながら、前記の異常状態のうち高圧ダイオードの
短絡を除いたマグネトロンのモーディング現象やコアの
磁気飽和はマグネトロンの負荷状態や電源電圧の瞬時変
動等により一時的に起こることが有る。それに対してイ
ンバータ回路特に半導体スイッチング素子を保護する為
に、即、インバータ回路の動作を停止させることは必要
であるが、従来方式の前者のよう々手動再スタート方式
では非常に使い勝手が悪い。まだ後者の場合、共振電圧
のN山〃(電圧のピーク)の位相タイミングで自動再ス
タートがかかってしまうと、スイッチング損失により半
導体スイッチング素子が損傷してしまう。との発明はこ
のような事情に鑑みてなされたもので、使い勝手の良い
、自動再スタート方式でありながら半導体スイッチング
素子を劣化させないインバータ保護回路を備えだ高周波
加熱装置を提供するものである。
<Problems to be Solved by the Invention> However, among the abnormal conditions mentioned above, the moding phenomenon of the magnetron and the magnetic saturation of the core, excluding the short circuit of the high-voltage diode, are temporary due to the load condition of the magnetron, instantaneous fluctuations in the power supply voltage, etc. There are things that happen. On the other hand, in order to protect the inverter circuit, particularly the semiconductor switching elements, it is necessary to immediately stop the operation of the inverter circuit, but the former manual restart method of the conventional method is very inconvenient. In the latter case, if automatic restart is applied at the phase timing of the N peak of the resonant voltage, the semiconductor switching element will be damaged due to switching loss. The invention was made in view of these circumstances, and provides a high-frequency heating device that is easy to use, has an automatic restart system, and is equipped with an inverter protection circuit that does not deteriorate semiconductor switching elements.

〈問題点を解決するだめの手段〉 この発明の構成を第1図に示す。1,01は商用電源を
整流・平滑して直流電源を作る整流・平滑回路、102
はインバータ回路であり、マグネトロン、駆動用変圧器
104とそれに並列接続された共振コンデンサ103と
、変圧器104に直列に接続されたスイッチング素子1
o5及びダイオード106より構成される。108は制
御回路であり、マグネトロンの発振と同期したオン・オ
フパルス信号を駆動回路107に与えてスイッチング素
子105を20KH2〜100KH2程度の周波数テス
イソチング動作させる。110はインバータ保護回路で
あり、異常検出回路109が過大なアノード電圧或はア
ノード電流を検出した場合に制御回路108のオン−オ
フパルス信号出力を一定時間停止させる。そして共振電
圧の\\谷〃の時間領域で自動再スタートさせる。或は
、共振電圧が十分減衰したことを検出してから自動再ス
タートさせる。
<Means for solving the problem> The configuration of this invention is shown in FIG. 1,01 is a rectifier/smoothing circuit that rectifies and smoothes commercial power to create DC power; 102
is an inverter circuit, which includes a magnetron, a driving transformer 104, a resonant capacitor 103 connected in parallel to it, and a switching element 1 connected in series to the transformer 104.
o5 and a diode 106. Reference numeral 108 denotes a control circuit, which applies an on/off pulse signal synchronized with the oscillation of the magnetron to the drive circuit 107 to operate the switching element 105 at a frequency of approximately 20 KH2 to 100 KH2. Reference numeral 110 denotes an inverter protection circuit, which stops the on-off pulse signal output of the control circuit 108 for a certain period of time when the abnormality detection circuit 109 detects excessive anode voltage or anode current. Then, it is automatically restarted in the time domain of the \\valley of the resonance voltage. Alternatively, it is automatically restarted after detecting that the resonant voltage has sufficiently attenuated.

111はマグネトロン駆動回路、112はマグネトロン
である。
111 is a magnetron drive circuit, and 112 is a magnetron.

く作 用〉 制御回路108が出力するオン・オフパルス信号は駆動
回路107で増幅されて、スイッチング素子105に与
えられる。スイッチング素子105の動作状態を第2図
に示す。制御回路108がオン信号を出力すると、スイ
ッチング素子コ−05は導通して、第2図中の破線のコ
レクタ電流Icをマグネトロン駆動用変圧器104に共
給する。そして制御回路108がオフ信号を出力すると
スイッチング素子105は非導通になり、共振コンデン
サ103とマグネトロン駆動用変圧器104とが共振回
路を構成し共振電圧がスイッチング素子105のコレク
タ電圧VCHにあられれる。インバータ回路102は2
0KH2〜100KH2程度の周波数で動作しており、
電源周期でのスイッチング素子105のコレクタ電圧波
形は第3図のようになる。
Function> The on/off pulse signal outputted by the control circuit 108 is amplified by the drive circuit 107 and given to the switching element 105. FIG. 2 shows the operating state of the switching element 105. When the control circuit 108 outputs an on signal, the switching element Co-05 becomes conductive and supplies the collector current Ic indicated by the broken line in FIG. 2 to the magnetron driving transformer 104. When the control circuit 108 outputs an off signal, the switching element 105 becomes non-conductive, the resonant capacitor 103 and the magnetron drive transformer 104 form a resonant circuit, and a resonant voltage is applied to the collector voltage VCH of the switching element 105. The inverter circuit 102 is 2
It operates at a frequency of about 0KH2 to 100KH2,
The collector voltage waveform of the switching element 105 during the power supply cycle is as shown in FIG.

マグネトロン駆動用変圧器104に、マグネトロン駆動
回路111の入力電圧と相似な電圧波形を得られる補巻
線9を設け、マグネトロンの発振の同期信号を制御回路
108に入力すると共に異常検出回路109に入力し、
マグネトロンのアノード電圧を検出している。この補巻
線9の出力電圧は、マグネトロンのアノード電圧、マグ
ネトロン下動用変圧器104の共振電圧と相似である。
The magnetron drive transformer 104 is provided with an auxiliary winding 9 that can obtain a voltage waveform similar to the input voltage of the magnetron drive circuit 111, and a synchronizing signal for magnetron oscillation is input to the control circuit 108 and also to the abnormality detection circuit 109. death,
Detecting the magnetron anode voltage. The output voltage of this auxiliary winding 9 is similar to the anode voltage of the magnetron and the resonant voltage of the magnetron downward transformer 104.

従って補巻線9の出力電圧からスイッチング素子105
のコレクタ電圧を検出できる。また、マグネトロン、駆
動用変圧器104の高圧2次巻線(マグネトロン1駆動
回路側)からマグネトロンのアノード電流を異常検出回
路109に入力することによりスイッチング素子105
のコレクタ電流を検出できる。この2つの入力からスイ
ッチング素子105が安全動作領域内であるかを判定し
、異常検出回路109がそれを越えたと判断するとイン
バータ保護回路110が作動する。すなわち制御回路1
08内のパルス信号発生を一定時間停止させる。インバ
ータ回路のスイッチング動作が停止すると共振コンデン
サ103とマグネトロン駆動用変圧器104とが共振し
、スイッチング素子105のコレクタには、ダンパーダ
イオード106でクランプされた電圧があられれる。(
第4図)第4図中■時点でインバータ保護回路110が
作動すると共振電圧は減衰を始める。一定時間T経過後
コレクタ電圧のへ谷〃の領域■中に再スタートさせるな
らばコレクタ電圧VCEはダンパーダイオード106の
クランプ電圧若しくは、電源電圧より低い電圧であるか
らスイッチング損失はわずかでスイッチング素子105
がこわれることはない。
Therefore, from the output voltage of the auxiliary winding 9, the switching element 105
collector voltage can be detected. In addition, by inputting the anode current of the magnetron from the high-voltage secondary winding (magnetron 1 drive circuit side) of the magnetron and drive transformer 104 to the abnormality detection circuit 109, the switching element 105
collector current can be detected. Based on these two inputs, it is determined whether the switching element 105 is within the safe operation range, and when the abnormality detection circuit 109 determines that the range has been exceeded, the inverter protection circuit 110 is activated. That is, control circuit 1
The pulse signal generation within 08 is stopped for a certain period of time. When the switching operation of the inverter circuit stops, the resonant capacitor 103 and the magnetron drive transformer 104 resonate, and the voltage clamped by the damper diode 106 is applied to the collector of the switching element 105. (
FIG. 4) When the inverter protection circuit 110 is activated at point 3 in FIG. 4, the resonant voltage begins to attenuate. If the collector voltage VCE is restarted in the trough region of the collector voltage after a certain period of time T has elapsed, the switching loss is small because the collector voltage VCE is lower than the clamp voltage of the damper diode 106 or the power supply voltage.
will not be broken.

(11山〃の領域■では、スイッチング損失が大きい。(In the region (2) with 11 peaks, the switching loss is large.

)寸だ、共振電圧が十分減衰したこと(減衰OKレベル
以下)を検出0点してから再スタートする場合はタイミ
ングを気にすることなく、スイッチング素子105がこ
われることもない0 このようにして、マグネトロンのアノード電圧或はアノ
ード電流が異常に大きくなったことを検出してインバー
タ回路102を停止した後、一定時間経過してから、共
振電圧の谷の領域のタイミングで自動再スタートを行な
うが共振電圧が十分減衰したことを検知してから自動再
スタートを行なうようにすればスイッチング素子105
を損傷することがない。
) When restarting after detecting that the resonance voltage has sufficiently attenuated (below the attenuation OK level), there is no need to worry about the timing, and the switching element 105 will not be damaged. After detecting that the anode voltage or anode current of the magnetron has become abnormally large and stopping the inverter circuit 102, automatic restart is performed at the timing of the valley region of the resonance voltage after a certain period of time has passed. If automatic restart is performed after detecting that the resonant voltage has sufficiently attenuated, the switching element 105
without damaging it.

〈実施例〉 以下、図面に示す実施例に基づいてこの発明を詳述する
。なお、これによってこの発明が限定されるものではな
い。第5図は共振電圧の谷の領域のタイミングで自動再
スタートを行なう電気回路の一実施例を第1図に対応さ
せて示したものである。商用電源1にスイッチ2を介し
て整流・平滑回路101が接続されている。整流・平滑
回路101は整流ブリッジ3と、その出力端子にチョー
クコイル4と平滑コンデンサ5を接続して構成されてい
る。整流・平滑回路101の直流出力端子にはマグネト
ロン駆動用変圧器104の1次巻線6と共振コンデンサ
103の並列共振回路が接続され、またマグネトロン駆
動用変圧器104とスイッチング素子105の直列回路
が接続され、ダンパーダイオード106がスイッチング
素子105のコレクターエミッタ間に逆接続されている
。マグネトロン112を発振させるマグネトロン駆動回
路111ば、駆動用変圧器104を介してマグネトロン
ヒータ巻線7とマグネトロン入力巻線8を半波整流する
高圧ダイオード11と高圧コンデンサ10が接続されて
いる。制御回路108は電源トランス12と電源回路1
3により直流電源(−i2V)を作り、スイッチング素
子105を高周波スイッチングさせるだめのオン・オフ
パルス信号をパルス発生回路14で発生させている。マ
グネトロン、駆動用変圧器104のマグネトロン入力巻
線8と相似な電圧を出力する補巻線9から、マグネトロ
ン112の発振同期信号をタイミング回路17に入力し
て三角波発生回路16のタイミングを制御する。出力設
定部18からの入力と三角波電圧とを比較回路15でレ
ベル比較してパルス発生信号のオン・オフ時間幅が決ま
る。制御回路108各部の電圧波形を第6図に示す。補
巻線9の出力電圧は、マグネトロン112のアノード電
圧及びスイッチング素子105のコレクタ電圧と相似で
あるから、スイッチング素子105がオフの位相の電圧
をダイオード19で第1のコンパレータIC27に入力
し、抵抗23.24で決まる異常電圧検知レベルを越え
ると、抵抗25とコンデンサ26で決まる一定時間、ト
ランジスタ41゜42をオンにする。マグネトロン入力
巻線8からマグネトロンのアノード電流をダイオード3
5で第2のコンパレータIC38に入力し、抵抗33゜
34で決丑る異常電流検知レベルを越えると抵抗36と
コンデンサ37で決まる一定時間トランジスタ41.4
2をオンにする。トランジスタ42がオンになると出力
設定入力レベルをvD電圧レベルまで引き下げるので、
パルス信号のオン時間幅がゼロになシスイツチング素子
105のスイッチング動作が停止する。すると共振コン
デンサ103と1次巻線6が共振回路を構成し、第4図
のようになる。異常検出がなくなりトランジスタ41゜
42がオフになると(一定時間T経過後)、出力設定入
力レベルが復帰する。停止中の共振電圧のタイミングも
補巻線9を通じて入力し続けているから、自動再スター
トする位相は第4図のB領域の左端(山から谷へ移るゼ
ロクロスのタイミング)となり、スイッチング素子10
5のスイッチング損失を最小におさえることができてい
る。
<Examples> The present invention will be described in detail below based on examples shown in the drawings. Note that this invention is not limited to this. FIG. 5 shows, in correspondence with FIG. 1, an embodiment of an electric circuit that automatically restarts at the timing of the valley region of the resonant voltage. A rectifier/smoothing circuit 101 is connected to a commercial power source 1 via a switch 2 . The rectifier/smoothing circuit 101 includes a rectifier bridge 3, and a choke coil 4 and a smoothing capacitor 5 connected to its output terminal. A parallel resonant circuit of the primary winding 6 of a magnetron drive transformer 104 and a resonant capacitor 103 is connected to the DC output terminal of the rectifier/smoothing circuit 101, and a series circuit of the magnetron drive transformer 104 and a switching element 105 is connected. A damper diode 106 is connected in reverse between the collector and emitter of the switching element 105. A magnetron drive circuit 111 that causes the magnetron 112 to oscillate is connected to a high voltage capacitor 10 and a high voltage diode 11 that performs half-wave rectification of the magnetron heater winding 7 and magnetron input winding 8 via a driving transformer 104. The control circuit 108 includes the power transformer 12 and the power circuit 1
3 to create a DC power supply (-i2V), and the pulse generation circuit 14 generates an on/off pulse signal for high-frequency switching of the switching element 105. The oscillation synchronization signal of the magnetron 112 is input to the timing circuit 17 from the auxiliary winding 9 which outputs a voltage similar to the magnetron input winding 8 of the magnetron/driving transformer 104 to control the timing of the triangular wave generating circuit 16. A comparison circuit 15 compares the levels of the input from the output setting section 18 and the triangular wave voltage to determine the on/off time width of the pulse generation signal. FIG. 6 shows voltage waveforms at various parts of the control circuit 108. Since the output voltage of the auxiliary winding 9 is similar to the anode voltage of the magnetron 112 and the collector voltage of the switching element 105, the voltage in the phase in which the switching element 105 is off is inputted to the first comparator IC 27 through the diode 19, and When the abnormal voltage detection level determined by 23.24 is exceeded, the transistors 41 and 42 are turned on for a certain period of time determined by the resistor 25 and capacitor 26. The anode current of the magnetron is transferred from the magnetron input winding 8 to the diode 3.
5 to the second comparator IC 38, and when the abnormal current detection level determined by the resistor 33 and 34 is exceeded, the transistor 41.4 is input for a certain period of time determined by the resistor 36 and capacitor 37.
Turn on 2. When transistor 42 turns on, it lowers the output setting input level to the vD voltage level, so
The on-time width of the pulse signal becomes zero, and the switching operation of switching element 105 stops. Then, the resonant capacitor 103 and the primary winding 6 constitute a resonant circuit as shown in FIG. When the abnormality is no longer detected and the transistors 41 and 42 are turned off (after a certain period of time T has elapsed), the output setting input level is restored. Since the timing of the resonant voltage during stoppage continues to be input through the auxiliary winding 9, the phase for automatic restart is at the left end of region B in FIG.
5 switching loss can be kept to a minimum.

前記の、共振電圧が十分減衰したことを検出する方式の
場合は、ダイオード19を介して補巻線9からの入力電
圧を第1のコンパレータ■C27に入力し、その比較レ
ベル電圧を十分低く設定し、そのコンパレータの出力信
号と前記トランジスタ42の出力信号とでフリップフロ
ップ回路を構成することにより容易に実現できる。
In the case of the above-mentioned method of detecting that the resonant voltage has sufficiently attenuated, the input voltage from the auxiliary winding 9 is input to the first comparator C27 via the diode 19, and the comparison level voltage is set sufficiently low. However, this can be easily realized by constructing a flip-flop circuit using the output signal of the comparator and the output signal of the transistor 42.

〈発明の効果〉 本発明によれば、マグネトロンの負荷状態や電源電圧の
瞬時変動等により一時的に起こる、マグネトロンのアノ
ード電圧及びアノード電流の増大に対して瞬時にインバ
ータ回路を一定時間停止させた後、スイッチング素子を
損傷させることなく自動再スタートさせることができる
<Effects of the Invention> According to the present invention, the inverter circuit is instantly stopped for a certain period of time in response to an increase in the anode voltage and anode current of the magnetron, which occurs temporarily due to the load condition of the magnetron or instantaneous fluctuations in the power supply voltage. After that, automatic restart can be performed without damaging the switching elements.

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

第1図はこの発明の構成を示すブロック図、第2図(a
)は制御回路の出力信号、第2図(b)はスイッチング
素子のコレクタ電流、コレクタ電圧を示す波形図、 第3図は電源周期のスイッチング素子のコレクタ電圧波
形図、 第4図(a)はインバータ停止後の共振電圧、第4図(
b)はスイッチング素子のコレクタ電圧を示す波形図、 第5図はこの発明の一実施例を示す電気回路図、第6図
は第5図中の制御回路の各部の電圧波形である。 103:共振コンデンサ、1o4:マグ料ロン駆動用変
圧2105ニスイツチング素子、106 :ダイオード
、107:駆動回路、    1o8:制御回路、10
9:異常検出回路、   111:マグネトロン駆動回
路。
FIG. 1 is a block diagram showing the configuration of this invention, and FIG.
) is the output signal of the control circuit, Figure 2 (b) is a waveform diagram showing the collector current and collector voltage of the switching element, Figure 3 is the collector voltage waveform diagram of the switching element at the power cycle, and Figure 4 (a) is the waveform diagram showing the collector current and collector voltage of the switching element. Resonant voltage after inverter stop, Figure 4 (
b) is a waveform diagram showing the collector voltage of the switching element, FIG. 5 is an electric circuit diagram showing an embodiment of the present invention, and FIG. 6 is a voltage waveform of each part of the control circuit in FIG. 103: Resonance capacitor, 1o4: Magron drive transformer 2105 Niswitching element, 106: Diode, 107: Drive circuit, 1o8: Control circuit, 10
9: Abnormality detection circuit, 111: Magnetron drive circuit.

Claims (1)

【特許請求の範囲】 1、商用電源を整流・平滑して直流電源にする整流・平
滑回路と、マグネトロン駆動用変圧器、該変圧器と並列
もしくは直列接続された共振コンデンサ、前記変圧器と
直列接続されたダイオード及び半導体スイッチング素子
にて構成されたインバータ回路と、前記半導体スイッチ
ング素子を駆動させる駆動回路と、該駆動回路を制御す
る制御回路と、マグネトロン駆動回路及びマグネトロン
を備えてなる高周波加熱装置において、 上記インバータ回路の負荷であるマグネトロン駆動回路
及びマグネトロンの異常動作を検出する異常検出回路と
、異常動作検出から所定時間インバータ回路の動作を停
止させるインバータ保護回路を設けたことを特徴とする
高周波加熱装置。 2、所定時間インバータ回路の動作を停止させた後、マ
グネトロン駆動用変圧器と共振コンデンサとで構成され
る共振回路の共振電圧が谷の時間領域においてインバー
タ回路を再動作させる制御回路を有する特許請求の範囲
第1項記載の高周波加熱装置。 3、所定時間インバータ回路の動作を停止させた後、マ
グネトロン駆動用変圧器と共振コンデンサとで構成され
る共振回路の共振電圧が十分減衰してからインバータ回
路を再動作させる制御回路を有する特許請求の範囲第1
項記載の高周波加熱装置。
[Claims] 1. A rectifier/smoothing circuit that rectifies and smoothes a commercial power source to convert it into a DC power source, a magnetron drive transformer, a resonant capacitor connected in parallel or series with the transformer, and a rectifier/smoothing circuit connected in series with the transformer. A high-frequency heating device comprising an inverter circuit configured with connected diodes and semiconductor switching elements, a drive circuit that drives the semiconductor switching element, a control circuit that controls the drive circuit, a magnetron drive circuit, and a magnetron. The high frequency device is characterized by being provided with an abnormality detection circuit that detects abnormal operation of the magnetron drive circuit and magnetron that are loads of the inverter circuit, and an inverter protection circuit that stops the operation of the inverter circuit for a predetermined period of time after the abnormal operation is detected. heating device. 2. A patent claim that includes a control circuit that restarts the inverter circuit in a time domain where the resonant voltage of the resonant circuit composed of a magnetron drive transformer and a resonant capacitor is at its trough after stopping the operation of the inverter circuit for a predetermined period of time. The high frequency heating device according to item 1. 3. A patent claim that includes a control circuit that restarts the inverter circuit after the resonant voltage of the resonant circuit composed of the magnetron driving transformer and the resonant capacitor has sufficiently attenuated after stopping the operation of the inverter circuit for a predetermined period of time. range 1
The high-frequency heating device described in Section 1.
JP15385687A 1987-06-18 1987-06-18 High-frequency heating device Granted JPS63318091A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15385687A JPS63318091A (en) 1987-06-18 1987-06-18 High-frequency heating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15385687A JPS63318091A (en) 1987-06-18 1987-06-18 High-frequency heating device

Publications (2)

Publication Number Publication Date
JPS63318091A true JPS63318091A (en) 1988-12-26
JPH0569273B2 JPH0569273B2 (en) 1993-09-30

Family

ID=15571601

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15385687A Granted JPS63318091A (en) 1987-06-18 1987-06-18 High-frequency heating device

Country Status (1)

Country Link
JP (1) JPS63318091A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03156878A (en) * 1989-11-15 1991-07-04 Mitsubishi Electric Home Appliance Co Ltd High-frequency heating device
JPH03156887A (en) * 1989-11-15 1991-07-04 Mitsubishi Electric Home Appliance Co Ltd High-frequency heating device
KR100452997B1 (en) * 2002-06-18 2004-10-15 엘지전자 주식회사 A inverter circuit of inverter microwave oven

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS551392U (en) * 1979-07-04 1980-01-07
JPS5738588A (en) * 1980-08-19 1982-03-03 Nippon Electric Co High frequency power source
JPS5776785A (en) * 1980-10-29 1982-05-13 Sanyo Electric Co Electronic range

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS542480A (en) * 1977-06-01 1979-01-10 Kogyo Gijutsuin Low temperature dyeing of polyamide and protein fiber material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS551392U (en) * 1979-07-04 1980-01-07
JPS5738588A (en) * 1980-08-19 1982-03-03 Nippon Electric Co High frequency power source
JPS5776785A (en) * 1980-10-29 1982-05-13 Sanyo Electric Co Electronic range

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03156878A (en) * 1989-11-15 1991-07-04 Mitsubishi Electric Home Appliance Co Ltd High-frequency heating device
JPH03156887A (en) * 1989-11-15 1991-07-04 Mitsubishi Electric Home Appliance Co Ltd High-frequency heating device
KR100452997B1 (en) * 2002-06-18 2004-10-15 엘지전자 주식회사 A inverter circuit of inverter microwave oven

Also Published As

Publication number Publication date
JPH0569273B2 (en) 1993-09-30

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