JPH0518237B2 - - Google Patents
Info
- Publication number
- JPH0518237B2 JPH0518237B2 JP61024578A JP2457886A JPH0518237B2 JP H0518237 B2 JPH0518237 B2 JP H0518237B2 JP 61024578 A JP61024578 A JP 61024578A JP 2457886 A JP2457886 A JP 2457886A JP H0518237 B2 JPH0518237 B2 JP H0518237B2
- Authority
- JP
- Japan
- Prior art keywords
- detection circuit
- induction heating
- circuit
- small object
- high frequency
- 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
- 238000001514 detection method Methods 0.000 claims description 63
- 238000010438 heat treatment Methods 0.000 claims description 45
- 230000006698 induction Effects 0.000 claims description 31
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 235000003599 food sweetener Nutrition 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003765 sweetening agent Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Description
【発明の詳細な説明】
〔技術分野〕
本考案は、小物検知回路を備えた高周波誘導加
熱調理器に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a high frequency induction heating cooker equipped with a small object detection circuit.
一般に、高周波誘導加熱調理器の加熱プレート
上にスプーン等の小物を置いて加熱すると、スプ
ーン等が過熱して火傷を起こす危険がある。この
ため、高周波誘導加熱調理器には、従来より、加
熱プレート上に不適性な被加熱物を置いた場合に
加熱を中止させるようにするための安全装置であ
る小物検知回路が設けられていた。
Generally, when a small item such as a spoon is placed on the heating plate of a high-frequency induction heating cooker and heated, there is a risk that the spoon or the like will overheat and cause burns. For this reason, high-frequency induction heating cookers have traditionally been equipped with a small object detection circuit as a safety device to stop heating if an inappropriate object to be heated is placed on the heating plate. .
この従来の高周波誘導加熱調理器の回路図を第
５図に示す。 A circuit diagram of this conventional high frequency induction heating cooker is shown in FIG.
まず、高周波誘導加熱調理器の電力回路を説明
する。１は商用の低周波交流電源、２は整流回
路、３はインバータ回路であり、電源１からの低
周波交流を整流回路２で一旦整流してインバータ
回路３で高周波交流に変換している。そして、こ
の高周波交流をインバータ回路３内の誘導加熱コ
イル４に通じることにより、図外の加熱プレート
上に高周波磁界を生じさせ被加熱物を加熱するこ
とができる。次に、この高周波誘導加熱調理器の
小物検知回路を説明する。５は、電源電流検出回
路であり、変流器６によつて電源１からの低周波
交流の電流を検出し、この値を直流電圧値に変換
して出力する回路である。１６は、電源電流検出
回路５の出力と誘導加熱コイル４の近傍に設けら
れた検出用二次コイル７からの高周波磁界検出回
路１５からの出力とを比較して被加熱物の適性、
不適性を検出する小物検知回路、８は該小物検知
回路１６が不適性の場合に加熱を中止させる主制
御回路である。尚、９はダイオードブリツジ回
路、１０はチヨークコイル、１１は平滑用コンデ
ンサー、１２は共振コンデンサー、１３はスイツ
チング素子、１４はダイオード、１８は操作部で
ある。 First, the power circuit of the high frequency induction heating cooker will be explained. 1 is a commercial low frequency AC power supply, 2 is a rectifier circuit, and 3 is an inverter circuit. The low frequency AC from the power supply 1 is once rectified by the rectifier circuit 2, and then converted to high frequency AC by the inverter circuit 3. By passing this high-frequency alternating current to the induction heating coil 4 in the inverter circuit 3, a high-frequency magnetic field can be generated on a heating plate (not shown) to heat the object to be heated. Next, the small object detection circuit of this high frequency induction heating cooker will be explained. Reference numeral 5 denotes a power supply current detection circuit, which detects a low frequency AC current from the power supply 1 using a current transformer 6, converts this value into a DC voltage value, and outputs the same. 16 compares the output of the power supply current detection circuit 5 and the output from the high frequency magnetic field detection circuit 15 from the detection secondary coil 7 provided near the induction heating coil 4 to determine the suitability of the object to be heated;
A small object detection circuit 8 for detecting unsuitability is a main control circuit that stops heating when the small object detection circuit 16 is unsuitable. In addition, 9 is a diode bridge circuit, 10 is a chain coil, 11 is a smoothing capacitor, 12 is a resonance capacitor, 13 is a switching element, 14 is a diode, and 18 is an operating section.
上記のように構成された従来の高周波誘導加熱
調理器は任意に設定された一定のパルス幅でイン
バータ回路３を駆動すると、加熱プレート上に十
分大きな鉄鍋等の被加熱物を置いた場合には電源
電流検出回路５の出力が高周波磁界検出回路１５
からの出力よりも大きくなるので小物検知回路１
６は適性を有すると判断し主制御回路８によつて
加熱を中止されることはない。 In the conventional high-frequency induction heating cooker configured as described above, when the inverter circuit 3 is driven with an arbitrarily set constant pulse width, when a sufficiently large object to be heated such as an iron pot is placed on the heating plate, The output of the power supply current detection circuit 5 is the high frequency magnetic field detection circuit 15.
Small object detection circuit 1
6 is determined to be suitable, and the main control circuit 8 does not stop the heating.
次に、加熱プレート上にスプーン等の小物を置
いた場合には、電源１からの低周波交流の電流が
あまり流れず電源電流検出回路５の出力が高周波
磁界検出回路１５からの出力よりも小さくなるの
で上記小物検知回路１６が不適性であると判断
し、主制御回路８が働いて加熱が中止される。 Next, when a small object such as a spoon is placed on the heating plate, the low frequency AC current from the power source 1 does not flow much and the output of the power source current detection circuit 5 is smaller than the output from the high frequency magnetic field detection circuit 15. Therefore, the small object detection circuit 16 determines that the small object is inappropriate, and the main control circuit 8 operates to stop heating.
以上が高周波誘導加熱調理器と小物検知回路１
６の動作であるが、此の種のものに於いては使用
者が小さい鍋等を加熱させようとした場合でも上
記小物検知回路１６が作動して誘導加熱機構が作
動しないという不都合があつた。 The above is the high frequency induction heating cooker and small object detection circuit 1
6, this type of device has the disadvantage that even if the user attempts to heat a small pot, etc., the small object detection circuit 16 is activated and the induction heating mechanism is not activated. .
本発明は上記小物検知回路の動作レベルを可変
する可変手段を設け、該可変手段の可変操作によ
り小物検知回路の検知レベルを変化させることで
規定外の小物負荷（小さい鍋）の場合でも加熱で
きる高周波誘導加熱調理器を提供せんとしたもの
である。
The present invention provides a variable means for varying the operating level of the small object detection circuit, and by changing the detection level of the small object detection circuit by variable operation of the variable means, it is possible to heat even an unspecified small object load (small pot). The purpose is to provide a high frequency induction heating cooker.
１は商用の低周波交流電源、２はダイオードブ
リツジ回路、チヨークコイル１０及び平滑用コン
デンサー１１からなる整流回路、３は主制御回路
８によつて制御されるインバータ回路にして、誘
導熱コイル４と共振用コンデンサ１２との並列回
路に直列にスイツチング素子１３を接続したもの
であり、このスイツチング素子１３のコレクター
エミツタ間にはダイオード１４が逆方向に接続さ
れている。
1 is a commercial low frequency AC power supply, 2 is a rectifier circuit consisting of a diode bridge circuit, a chiyoke coil 10 and a smoothing capacitor 11, and 3 is an inverter circuit controlled by a main control circuit 8, which is connected to an induction heating coil 4. A switching element 13 is connected in series to a parallel circuit with a resonance capacitor 12, and a diode 14 is connected between the collector and emitter of this switching element 13 in the opposite direction.
上記のように構成されたこの実施例の高周波誘
導加熱調理器の電力回路は、電源１からの低周波
交流を整流回路２で一旦整流してインバータ回路
３に供給する。インバータ回路３では、スイツチ
ング素子１３がスイツチング動作を行い整流回路
２からの直流を高周波交流に変換している。スイ
ツチングのタイミングは主制御回路８がスイツチ
ング素子１３のベース端子に駆動パルスを送るこ
とによりインバータ回路３の共振周期に同期させ
る。すなわち、スイツチング素子１３をONとし
て整流回路２から誘導加熱コイル４に流れ込む電
流がある程度大きくなつた時に、スイツチング素
子１３をOFFとする。すると、今度はダイオー
ド１４を介して逆方向の電流が流れることにな
り、この逆方向の電流がある程度小さくなつた時
に再びスイツチング素子１３をONする。以下こ
の動作を繰り返すことにより、直流を高周波交流
に変換している。 The power circuit of the high frequency induction heating cooker of this embodiment configured as described above rectifies the low frequency alternating current from the power source 1 in the rectifier circuit 2 and supplies it to the inverter circuit 3. In the inverter circuit 3, the switching element 13 performs a switching operation to convert the direct current from the rectifier circuit 2 into high frequency alternating current. The switching timing is synchronized with the resonance period of the inverter circuit 3 by the main control circuit 8 sending a drive pulse to the base terminal of the switching element 13. That is, when the switching element 13 is turned on and the current flowing from the rectifier circuit 2 to the induction heating coil 4 becomes large to a certain extent, the switching element 13 is turned off. Then, a current in the opposite direction flows through the diode 14, and when this current in the reverse direction becomes small to a certain extent, the switching element 13 is turned on again. By repeating this operation, direct current is converted to high frequency alternating current.
又、この実施例の高周波誘導加熱調理器の小物
検知は電源電流検出回路５、高周波磁界検出回路
１５、小物検知回路１６からなつている。上記電
源電流検出回路５は電源１からの回路中に設けた
変流器６の二次電流を直流電圧に変換して出力す
る検出回路であり、高周波磁界検出回路１５は誘
導加熱コイル４の近傍に設けられた検出用二次コ
イル７に励起された誘導電流を直流電圧に変換し
て出力する検出回路である。 Further, small object detection in the high frequency induction heating cooker of this embodiment consists of a power supply current detection circuit 5, a high frequency magnetic field detection circuit 15, and a small object detection circuit 16. The power supply current detection circuit 5 is a detection circuit that converts the secondary current of a current transformer 6 provided in the circuit from the power supply 1 into a DC voltage and outputs it, and the high frequency magnetic field detection circuit 15 is located near the induction heating coil 4. This is a detection circuit that converts the induced current excited in the detection secondary coil 7 provided in the DC voltage into a DC voltage and outputs the DC voltage.
そして、上記電源電流検出回路５からの出力と
高周波磁界検出回路１５からの出力とを小物検知
回路１６で比較し、前記電源電流検出回路５から
の出力が高周波磁界検出回路１５からの出力より
大きい場合には被加熱物が適性であると判断して
小物検出回路１６の出力端子がHighとなり、又
その反対に電源電流検出回路５からの出力が高周
波磁界検出回路１５からの出力より小さい場合に
は被加熱物が不適性であると判断して小物検知回
路１６の出力端子がLowとなるようになつてい
る。 Then, the output from the power supply current detection circuit 5 and the output from the high frequency magnetic field detection circuit 15 are compared by the small object detection circuit 16, and the output from the power supply current detection circuit 5 is larger than the output from the high frequency magnetic field detection circuit 15. In this case, it is determined that the object to be heated is suitable and the output terminal of the small object detection circuit 16 becomes High, and conversely, when the output from the power supply current detection circuit 5 is smaller than the output from the high frequency magnetic field detection circuit 15. It is determined that the object to be heated is inappropriate, and the output terminal of the small object detection circuit 16 becomes Low.
１７は高周波磁界検出回路１５からの出力側に
設けられた電圧調整用の可変抵抗器（可変手段）
にして、該可変抵抗器１７の抵抗値を変化させる
ことにより小物検知回路１６の動作レベルを変え
るものである。即ち、可変抵抗器１７の抵抗値
を、高周波磁界検出回路１５からの出力が電源電
流検出回路５からの出力に比して小さくなるよう
に設定することにより小物荷であつても小物検知
回路１６の出力がHighとなり誘導加熱機構を作
動し得る。又、上記可変抵抗器１７の抵抗値を最
大にした場合には従来と同様に小物検知回路１６
が動作し、一定以下の小物鍋等を被加熱物として
加熱プレート上に載置しても加熱されないことと
なる。 17 is a variable resistor (variable means) for voltage adjustment provided on the output side from the high frequency magnetic field detection circuit 15
By changing the resistance value of the variable resistor 17, the operating level of the small object detection circuit 16 is changed. That is, by setting the resistance value of the variable resistor 17 so that the output from the high frequency magnetic field detection circuit 15 is smaller than the output from the power supply current detection circuit 5, the small object detection circuit 16 The output becomes High and the induction heating mechanism can be activated. Also, when the resistance value of the variable resistor 17 is maximized, the small object detection circuit 16
operates, and even if a small pot or the like that is smaller than a certain size is placed on the heating plate as an object to be heated, it will not be heated.
第２図は上記可変手段である可変抵抗器１７を
電源電流検出回路５の出力端子側に設けたもので
あり、該電源電流検出回路５からの出力を可変す
ることで小物検知回路１６の動作レベルを変える
ようにしたものである。即ち、可変抵抗器１７の
抵抗値を、電源電流検出回路５からの出力が高周
波磁界検出回路１５からの出力に比して大きくな
るように設定することにより小物負荷であつても
小物検知回路１６の出力がHighとなり誘導加熱
機構を作動し得る。又、上記可変抵抗器１７の抵
抗値を最大にした場合には従来と同様に小物検知
回路１６が動作し、一定以下の小物鍋等を被加熱
物として加熱プレート上に載置しても加熱されな
いこととなる。 In FIG. 2, a variable resistor 17, which is the variable means described above, is provided on the output terminal side of the power supply current detection circuit 5, and the operation of the small object detection circuit 16 is controlled by varying the output from the power supply current detection circuit 5. It is designed to change the level. That is, by setting the resistance value of the variable resistor 17 so that the output from the power supply current detection circuit 5 is larger than the output from the high frequency magnetic field detection circuit 15, the small object detection circuit 16 can be used even when the load is a small object. The output becomes High and the induction heating mechanism can be activated. Furthermore, when the resistance value of the variable resistor 17 is maximized, the small object detection circuit 16 operates as in the conventional case, and even if a small pot or the like that is below a certain value is placed on the heating plate as an object to be heated, it will not be heated. It will not be done.
第３図、第４図は第１図、第２図の可変抵抗器
１７をスイツチに置き変えたものであり、第３図
ではスイツチ１９をONにした時、高周波磁界検
出回路１５の出力を検出しないよう二次コイル７
の出力をグランドに接続している。このため、第
３図のスイツチ１９をONした時には第１図の可
変抵抗器１７を最小（０）にした時と同様に小物
負荷でも加熱し、又スイツチ１９をOFFにした
時は上記可変抵抗器１７を最大にした時と同様に
小物検知回路１６が働き、加熱プレート上の被加
熱物は加熱されない。 3 and 4, the variable resistor 17 in FIGS. 1 and 2 is replaced with a switch, and in FIG. 3, when the switch 19 is turned on, the output of the high frequency magnetic field detection circuit 15 is Secondary coil 7 to avoid detection
The output of is connected to ground. Therefore, when the switch 19 in Figure 3 is turned ON, even the small load is heated in the same way as when the variable resistor 17 in Figure 1 is set to the minimum (0), and when the switch 19 is turned OFF, the variable resistor 17 shown in Figure 1 is heated. The small object detection circuit 16 operates in the same way as when the container 17 is maximized, and the object to be heated on the heating plate is not heated.
第４図はONにした時に電源電流検出回路５の
出力が電源Vccに接続されるようなスイツチ１９
を設けたものであり、該スイツチ１９をONにし
た時は第２図の可変抵抗器１７の最小動作位置に
設定した時と同様に（Vccの値は適宜設定され
る）小物負荷でも加熱することとなり、該スイツ
リ１９をOFFにした時は上記可変抵抗器１７を
最大にした時と同様に小物検知回路１６が働き、
加熱プレート上の被加熱物は加熱されない。 Figure 4 shows a switch 19 that connects the output of the power supply current detection circuit 5 to the power supply Vcc when turned on.
When the switch 19 is turned on, it heats even small loads in the same way as when the variable resistor 17 is set to the minimum operating position in Fig. 2 (the value of Vcc is set appropriately). Therefore, when the sweetener 19 is turned off, the small object detection circuit 16 operates in the same way as when the variable resistor 17 is set to the maximum value.
The object to be heated on the heating plate is not heated.
本発明は、以上の如く構成されるものであるか
ら、動作レベル可変手段により小物検知回路の動
作レベルを可変することにより、規定の大きさの
被加熱容器より小さな規定外の被加熱容器であつ
ても誘導加熱を行うことができ、しかも、小物検
知回路の動作レベルを可変するものであるので、
規定外の被加熱容器を全て誘導加熱加熱可能にす
るものではなく、従来と同様にスプーンやナイフ
等の小物については誘導加熱を禁止することがで
き、安全性の高い非常に便利の良い高周波誘導加
熱調理器を提供することができるものである。
Since the present invention is configured as described above, by varying the operation level of the small object detection circuit by the operation level variable means, it is possible to detect a non-standard heated container smaller than a specified size heated container. Induction heating can be performed even when the object is detected, and the operating level of the small object detection circuit can be varied.
It does not allow induction heating of all non-standard heated containers, but it does prohibit induction heating of small items such as spoons and knives as before, making it a very safe and convenient high-frequency induction method. It is possible to provide a heating cooker.
第１図は本発明の高周波誘導加熱調理器の電気
回路図、第２図乃至第４図は同上高周波誘導加熱
調理器に於ける他実施例の電気回路図、第５図は
従来の高周波誘導加熱調理器の電気回路図を示
す。
３：インバータ回路、４：誘導加熱コイル、
５：電源電流検出回路、６：変流器、１５：高周
波磁界検出回路、１６：小物検知回路、１７：可
変手段。
Fig. 1 is an electric circuit diagram of the high frequency induction heating cooker of the present invention, Figs. 2 to 4 are electric circuit diagrams of other embodiments of the same high frequency induction heating cooker, and Fig. 5 is an electric circuit diagram of a conventional high frequency induction heating cooker. The electric circuit diagram of the heating cooker is shown. 3: Inverter circuit, 4: Induction heating coil,
5: Power supply current detection circuit, 6: Current transformer, 15: High frequency magnetic field detection circuit, 16: Small object detection circuit, 17: Variable means.
Claims (1)
ト上に載置した時に誘導加熱機構を作動させない
ように動作する小物検知回路を備えた高周波誘導
加熱調理器に於いて、 上記小物検知回路の動作レベルを、スプーンや
ナイフ等の小物以外で規定の大きさの被加熱容器
より小さな規定外の被加熱容器を載置した時に誘
導加熱機構を作動可能にするために可変する動作
レベル可変手段を設けたことを特徴とする高周波
誘導加熱調理器。[Scope of Claims] 1. In a high-frequency induction heating cooker equipped with a small object detection circuit that operates to prevent the induction heating mechanism from operating when a heated container of an unspecified size is placed on the top plate, The operation level of the small object detection circuit is varied in order to enable the induction heating mechanism to operate when a non-standard heated container smaller than a specified size heated container other than small objects such as spoons and knives is placed. A high-frequency induction heating cooker characterized by being provided with an operation level variable means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61024578A JPS62180985A (en) | 1986-02-05 | 1986-02-05 | Radio frequency induction heating cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61024578A JPS62180985A (en) | 1986-02-05 | 1986-02-05 | Radio frequency induction heating cooker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62180985A JPS62180985A (en) | 1987-08-08 |
| JPH0518237B2 true JPH0518237B2 (en) | 1993-03-11 |
Family
ID=12142045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61024578A Granted JPS62180985A (en) | 1986-02-05 | 1986-02-05 | Radio frequency induction heating cooker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62180985A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5725496B2 (en) * | 1974-11-12 | 1982-05-29 | ||
| JPS6116491A (en) * | 1984-06-30 | 1986-01-24 | 株式会社東芝 | Induction heating cooking device |
| JPS6124189A (en) * | 1984-07-13 | 1986-02-01 | 株式会社東芝 | Induction heating cooking device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6213351Y2 (en) * | 1980-07-19 | 1987-04-06 |
-
1986
- 1986-02-05 JP JP61024578A patent/JPS62180985A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5725496B2 (en) * | 1974-11-12 | 1982-05-29 | ||
| JPS6116491A (en) * | 1984-06-30 | 1986-01-24 | 株式会社東芝 | Induction heating cooking device |
| JPS6124189A (en) * | 1984-07-13 | 1986-02-01 | 株式会社東芝 | Induction heating cooking device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62180985A (en) | 1987-08-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |