JPH0231471B2 - - Google Patents
Info
- Publication number
- JPH0231471B2 JPH0231471B2 JP56183271A JP18327181A JPH0231471B2 JP H0231471 B2 JPH0231471 B2 JP H0231471B2 JP 56183271 A JP56183271 A JP 56183271A JP 18327181 A JP18327181 A JP 18327181A JP H0231471 B2 JPH0231471 B2 JP H0231471B2
- Authority
- JP
- Japan
- Prior art keywords
- heating coil
- circuit
- magnetic
- pot
- capacitor
- 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 - Lifetime
Links
- 238000010438 heat treatment Methods 0.000 claims description 33
- 230000010355 oscillation Effects 0.000 claims description 27
- 238000010411 cooking Methods 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 238000009499 grossing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
Description
【発明の詳細な説明】
本発明は、たとえば高周波磁界を利用して調理
鍋を誘導加熱することによりその調理鍋内の食品
を加熱調理する調理器に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooking device that heats food in a cooking pot by induction heating the cooking pot using, for example, a high-frequency magnetic field.
一般にこの種の調理器は、加熱コイルとコンデ
ンサとで直列（または並列）共振回路を形成し、
上記加熱コイルに直列にトランジスタを接続し、
前記加熱コイルに流れる電流を検出する手段を設
け、この手段で検出された電流の方向および値に
基いてこの電流が正、負方向に交互に持続して流
れるように前記トランジスタをオン・オフ制御す
る制御回路を設けている。なお、調理器の構造と
しては、たとえば耐熱性ガラスなどで形成された
加熱台の裏側に環状の加熱コイルを設け、上記加
熱台の上にたとえば磁性体で形成された被加熱物
たとえば調理鍋を載置するようにしている。 Generally, this type of cooker forms a series (or parallel) resonant circuit with a heating coil and a capacitor.
Connect a transistor in series to the above heating coil,
Means for detecting the current flowing through the heating coil is provided, and based on the direction and value of the current detected by the means, the transistor is turned on and off so that the current continues to flow alternately in the positive and negative directions. A control circuit is provided to The structure of the cooker is such that an annular heating coil is provided on the back side of a heating table made of heat-resistant glass or the like, and an object to be heated, such as a cooking pot, made of a magnetic material is placed on the heating table. I'm trying to place it there.
而して、前記加熱コイルに高周波電流を流すこ
とにより高周波磁界を発生させ、その磁界を加熱
台を介して調理鍋に与えて渦電流損を生じさせ、
その渦電流損によつて調理鍋を自己発熱させるこ
とにより調理鍋内の食品を加熱調理するようにな
つている。 A high-frequency magnetic field is generated by passing a high-frequency current through the heating coil, and the magnetic field is applied to the cooking pot via the heating stand to cause eddy current loss,
The eddy current loss causes the cooking pot to self-heat, thereby cooking the food in the cooking pot.
ところで、従来の調理器は、使用可能な調理鍋
として鉄、鋳物等の磁性体鍋を指定する磁性体鍋
専用のものが多いが、誘導加熱原理からして非磁
性体である18−８ステンレス、銅、アルミニウム
等の調理鍋も加熱可能である。しかし、加熱コイ
ルのインダクタンスは調理鍋の材質によつて大き
く変化するものであり、磁性体鍋専用の調理器に
非磁性体鍋を使用すると加熱コイル、インバータ
用トランジスタ等の発振条件が変化し、インバー
タ用トランジスタの温度上昇が高くなつてしま
う。そこで、従来の磁性体鍋専用の調理器におい
ては、上記トランジスタの温度上昇により保護サ
ーマルスイツチを動作させ、このスイツチの動作
により加熱動作を停止させるように制御してい
る。けれども調理器としては、使用鍋の材質を限
定しない汎用性のあるものが望ましい。 By the way, many conventional cookers are designed specifically for magnetic pots, such as those made of iron or cast iron, but due to the principle of induction heating, 18-8 stainless steel is a non-magnetic material. Cooking pots made of copper, aluminum, etc. can also be heated. However, the inductance of the heating coil varies greatly depending on the material of the cooking pot, and if a non-magnetic pot is used in a cooker designed for magnetic pots, the oscillation conditions of the heating coil, inverter transistor, etc. will change. The temperature of the inverter transistor increases. Therefore, in a conventional cooker dedicated to a magnetic pot, a protective thermal switch is activated by the temperature rise of the transistor, and the heating operation is stopped by the operation of this switch. However, as a cooker, it is desirable to have a versatile one that does not limit the material of the pot that can be used.
本発明は上記の事情に鑑みてなされたもので、
磁性体鍋、非磁性体鍋の区別により制御回路の発
振周波数を可変するため加熱コイルおよびコンデ
ンサを切換制御することによつて、上記二種類の
鍋のどちらを使用した場合でも能率よく加熱で
き、さらに磁気検出装置により上記鍋の区別を自
動的に行なつて上記切換制御を行なうことにより
取扱いが簡単になる調理器を提供するものであ
る。 The present invention was made in view of the above circumstances, and
By switching and controlling the heating coil and capacitor to vary the oscillation frequency of the control circuit depending on whether the pot is a magnetic pot or a non-magnetic pot, efficient heating can be achieved no matter which of the two types of pots are used. Furthermore, the present invention provides a cooking appliance that is easy to handle by automatically distinguishing between the pots using a magnetic detection device and performing the switching control.
以下、図面を参照して本発明の一実施例を詳細
に説明する。 Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
第１図において、１１は交流電源プラグ、１２
は後述するトランジスタを保護するためのサーマ
ルスイツチ、１３は電源整流回路、１４は平滑回
路であり、これらの整流回路１３および平滑回路
１４は直流電源を形成しており、この電源の出力
端間には高周波発振回路１５が接続されている。
この発振回路１５は、各一端が共通接続された第
１、第２の加熱コイルL1，L2と、この加熱コイ
ルL1，L2の各他端を切換選択する切換スイツチ
S1と、このスイツチS1に直列接続された切換スイ
ツチS2と、このスイツチS2により各一端が切換選
択され、各他端が共通接続された第１、第２のコ
ンデンサC1，C2と、この切換スイツチS2および
上記コンデンサC1あるいはC2の直列回路にそれ
ぞれ並列接続されたスイツチングトランジスタ１
６およびこれを保護するためのダイオード１７よ
りなる。 In Figure 1, 11 is an AC power plug, 12
13 is a power supply rectifier circuit, and 14 is a smoothing circuit. These rectifier circuit 13 and smoothing circuit 14 form a DC power supply, and there is a connection between the output terminals of this power supply. is connected to the high frequency oscillation circuit 15.
This oscillation circuit 15 includes first and second heating coils L 1 and L 2 whose respective ends are connected in common, and a changeover switch which switches and selects the respective other ends of the heating coils L 1 and L 2 .
S1 , a changeover switch S2 connected in series to this switch S1 , and first and second capacitors C1 and C, each one end of which is switched and selected by this switch S2 , and each other end of which is commonly connected . 2 , and a switching transistor 1 connected in parallel to the series circuit of the changeover switch S 2 and the capacitor C 1 or C 2 , respectively.
6 and a diode 17 for protecting it.
一方、１８は制御発振回路であり、切換スイツ
チS3により切換可能な２個の発振時定数回路１９
１，１９2と、この時定数回路により発振周波数が
定まる発振回路２０と、その他の信号処理を行な
う制御回路を有している。しかして、制御発振回
路１８の出力は上記トランジスタ１６のベース・
エミツタ間に供給されるようになつている。２１
は前記電源整流回路１３の一次側電源線に流れる
電流入力を検出するための電流トランスであり、
その出力は前記制御発振回路１８に供給されるよ
うになつている。 On the other hand, 18 is a controlled oscillation circuit, which includes two oscillation time constant circuits 19 that can be switched by a changeover switch S3 .
1 , 19 2 , an oscillation circuit 20 whose oscillation frequency is determined by this time constant circuit, and a control circuit that performs other signal processing. Therefore, the output of the controlled oscillation circuit 18 is connected to the base of the transistor 16.
It is designed to be supplied between the emitters. 21
is a current transformer for detecting the current input flowing to the primary power line of the power rectifier circuit 13,
Its output is supplied to the controlled oscillation circuit 18.
而して、上記構成において、切換スイツチS1，
S2，S3は連動するものであり、磁性体鍋の使用時
には、第１の加熱コイルL1、第１のコンデンサ
C1および第１の時定数回路１９1を選択し、第１
の加熱コイルL1と第１のコンデンサC1とで直列
共振回路を形成するとともに、その共振周波数に
対応する周波数f1の制御パルス出力を制御発振回
路１８から得るようにしている。そして、制御発
振回路１８の制御パルス出力によりトランジスタ
１６をオン、オフ駆動して高周波発振回路１５を
発振動作させることにより、第１の加熱コイル
L1から高周波磁界を発生させ、磁性体鍋内の食
品を加熱調理する。 Therefore, in the above configuration, the changeover switch S 1 ,
S 2 and S 3 are interlocked, and when using a magnetic pot, the first heating coil L 1 and the first capacitor
C 1 and the first time constant circuit 19 1 are selected, and the first
The heating coil L 1 and the first capacitor C 1 form a series resonant circuit, and a control pulse output having a frequency f 1 corresponding to the resonant frequency is obtained from the control oscillation circuit 18 . Then, by driving the transistor 16 on and off by the control pulse output of the controlled oscillation circuit 18 and causing the high frequency oscillation circuit 15 to operate in oscillation, the first heating coil
A high-frequency magnetic field is generated from L 1 to heat and cook the food in the magnetic pot.
これに対して、非磁性体鍋の使用時には、第２
の加熱コイルL2、第２のコンデンサC2および第
２の時定数回路１９2を選択し、第２の加熱コイ
ルL2と第２のコンデンサC2とで直列共振回路を
形成するとともに、その共振周波数に対応する周
波数f2の制御パルス出力を制御発振回路１８から
得るようにしている。そして、制御発振回路１８
の制御パルス出力によりトランジスタ１６をオ
ン、オフ駆動して高周波発振回路１５を発振動作
させることにより、第２の加熱コイルL2から高
周波磁界を発生させ、磁性体鍋内の食品を加熱調
理する。この場合、たとえば18−８ステンレス鍋
に対しては磁性体鍋に対するよりも前記周波数を
高く（2＜1）設定すればよいことが実験的に求
められている。 On the other hand, when using a non-magnetic pot, the second
The heating coil L 2 , the second capacitor C 2 and the second time constant circuit 19 2 are selected to form a series resonant circuit with the second heating coil L 2 and the second capacitor C 2 . A control pulse output having a frequency f 2 corresponding to the resonance frequency is obtained from the control oscillation circuit 18 . And the controlled oscillation circuit 18
The transistor 16 is turned on and off by the control pulse output, and the high frequency oscillation circuit 15 is driven to oscillate, thereby generating a high frequency magnetic field from the second heating coil L2 and cooking the food in the magnetic pot. In this case, it has been experimentally determined that the frequency should be set higher ( 2 < 1 ) for an 18-8 stainless steel pot than for a magnetic pot.
なお、電流トランス２１の出力により交流電源
入力の過大時（たとえば加熱コイルの負荷となる
調理鍋がないとか小さい場合など）が検出される
と、制御発振回路１８の出力は発振回路１５の発
振動作を停止させるようになり、加熱動作が停止
する。 Note that when an excessive AC power input is detected by the output of the current transformer 21 (for example, when there is no cooking pot serving as a load on the heating coil or the cooking pot is small), the output of the controlled oscillation circuit 18 is activated by the oscillation operation of the oscillation circuit 15. The heating operation will stop.
また、上記実施例における発振形態（周波数）
の切換は、手動操作によつてもよいが、磁気検出
スイツチを用いて調理鍋が磁性体か非磁性体かを
判別し、この判別結果によりたとえばリレーを制
御して自動的な切換を行なうようにしてもよい。 In addition, the oscillation form (frequency) in the above example
The switching may be done manually, but it is also possible to use a magnetic detection switch to determine whether the cooking pot is magnetic or non-magnetic, and use this determination result to control, for example, a relay to perform automatic switching. You may also do so.
なお非磁性体鍋として18−８ステンレス鍋の使
用を限定する場合には、この18−８ステンレス鍋
に対する発振条件と磁性体鍋に対する発振条件と
が近いので、加熱コイルとして１種類を共用し、
コンデンサC1，C2および時定数回路１９1，１９2
を切換えるようにしてもよい。 In addition, when limiting the use of an 18-8 stainless steel pot as a non-magnetic pot, the oscillation conditions for this 18-8 stainless steel pot and the oscillation conditions for a magnetic pot are similar, so one type of heating coil should be used in common.
Capacitors C 1 , C 2 and time constant circuits 19 1 , 19 2
It is also possible to switch between the two.
上述したように本発明の調理器によれば、磁性
体鍋、非磁性体鍋の区別により制御回路の発振周
波数を切換制御し、従来不可能とされていた非磁
性体鍋をも加熱可能とすることによつて、上記二
種類の鍋のどちらを使用した場合でも能率よく加
熱できる。さらに、磁気検出装置により上記鍋の
区別を自動的に行なつて上記切換制御を行なうこ
とにより、調理器の取扱いが簡単になる等の利点
が得られる。 As described above, according to the cooker of the present invention, the oscillation frequency of the control circuit can be switched and controlled by distinguishing between magnetic and non-magnetic pots, and it is now possible to heat non-magnetic pots, which was previously considered impossible. By doing so, efficient heating can be achieved no matter which of the above two types of pots is used. Further, by automatically distinguishing between the pots using the magnetic detection device and performing the switching control, advantages such as ease of handling of the cooker can be obtained.
第１図は本発明に係る調理器の一実施例を示す
回路図である。
１３……電源整流回路、１４……平滑回路、
L1，L2……加熱コイル、C1，C2……コンデンサ、
１６……トランジスタ、１８……制御発振回路、
１９1，１９2……時定数回路、２０……発振回
路、S1，S2，S3……スイツチ。
FIG. 1 is a circuit diagram showing an embodiment of the cooking device according to the present invention. 13...Power rectifier circuit, 14...Smoothing circuit,
L 1 , L 2 ... Heating coil, C 1 , C 2 ... Capacitor,
16...transistor, 18...controlled oscillation circuit,
19 1 , 19 2 ... time constant circuit, 20 ... oscillation circuit, S 1 , S 2 , S 3 ... switch.
Claims (1)
誘導加熱する加熱コイルと、この加熱コイルとと
もに共振回路を形成するコンデンサと、前記加熱
コイル、コンデンサとともに高周波発振回路を形
成するトランジスタと、前記トランジスタのオ
ン、オフ駆動を制御する制御手段とを具備し、こ
の制御手段は前記被加熱物の材質に応じて前記ト
ランジスタのオン、オフ周波数を切換えるととも
に、前記共振回路は上記被加熱物の材質に応じて
共振周波数を切換えるようにコンデンサや加熱コ
イルの切換選択手段を備えたことを特徴とする調
理器。 ２ 前記被加熱物の材質を磁気検出装置により検
出し、この検出結果に応じて前記制御手段による
制御を自動的に行なうことを特徴とする特許請求
の範囲第１項記載の調理器。[Scope of Claims] 1. A DC power source, a heating coil connected to the power source for induction heating of an object to be heated, a capacitor that forms a resonant circuit together with the heating coil, and a high frequency oscillation circuit formed together with the heating coil and the capacitor. and control means for controlling on/off driving of the transistor, the control means switching the on/off frequency of the transistor according to the material of the object to be heated, and the resonant circuit A cooking appliance characterized by comprising a switching selection means for a capacitor and a heating coil so as to switch the resonant frequency according to the material of the object to be heated. 2. The cooking appliance according to claim 1, wherein the material of the object to be heated is detected by a magnetic detection device, and control by the control means is automatically performed according to the detection result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18327181A JPS5885293A (en) | 1981-11-16 | 1981-11-16 | Cooking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18327181A JPS5885293A (en) | 1981-11-16 | 1981-11-16 | Cooking device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5885293A JPS5885293A (en) | 1983-05-21 |
| JPH0231471B2 true JPH0231471B2 (en) | 1990-07-13 |
Family
ID=16132731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18327181A Granted JPS5885293A (en) | 1981-11-16 | 1981-11-16 | Cooking device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5885293A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6116491A (en) * | 1984-06-30 | 1986-01-24 | 株式会社東芝 | Induction heating cooking device |
| JPH0612699B2 (en) * | 1985-11-27 | 1994-02-16 | 株式会社東芝 | Induction heating cooker |
| JP2633546B2 (en) * | 1987-02-10 | 1997-07-23 | 株式会社東芝 | Induction heating cooker |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5458235A (en) * | 1977-10-18 | 1979-05-10 | Matsushita Electric Ind Co Ltd | Induction heating device for cooking |
-
1981
- 1981-11-16 JP JP18327181A patent/JPS5885293A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5458235A (en) * | 1977-10-18 | 1979-05-10 | Matsushita Electric Ind Co Ltd | Induction heating device for cooking |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5885293A (en) | 1983-05-21 |
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