JP2004220917A

JP2004220917A - Heating cooker

Info

Publication number: JP2004220917A
Application number: JP2003006781A
Authority: JP
Inventors: Hiroyasu Shiichi; 広康私市
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2003-01-15
Filing date: 2003-01-15
Publication date: 2004-08-05
Anticipated expiration: 2023-01-15
Also published as: JP4114484B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker which is safe and does not waste electric power even when the cooker is left energized, while fried food cooking is finished, or the fried food cooking is interrupted for long time. <P>SOLUTION: The heating cooker comprises: a temperature detecting means which detects a temperature of oil inside a cooking vessel; a control means which controls power supply to a heater or an induction heating coil so that the temperature of the oil inside the cooking vessel reaches a predetermined setting temperature; and a current detecting means which detects the current of the heater or the induction heating coil. The control means stops the power supply to the heater or the induction heating coil if the amount of the change in the current detected by the current detecting means lasts below a predetermined value for a predetermined period after the temperature of the oil reaches the setting temperature for the fried cooking. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、天ぷら調理ができる加熱調理器に関するものである。
【０００２】
【従来の技術】
図１３は、従来の加熱調理器の天ぷら調理時における制御動作の様子を示したものである。
従来の加熱調理器においては、検出温度が第１の基準温度となるように加熱コイルを制御して調理容器内部の油温度を立ち上げ、その後、前記検出温度が第２の基準温度となるように制御して、油温度が設定温度となるようにする。その間に前記検出温度が負荷投入検知温度以下になる状態が所定時間継続した場合、食材が投入されたと判定し、前記検出温度を前記第２の基準温度より高い第３の基準温度となるように制御して、食材投入による油温度の低下を迅速に回復させる（例えば特許文献１）。
【０００３】
【特許文献１】
特開２０００−１００５５４号公報
【０００４】
【発明が解決しようとする課題】
従来の加熱調理器は、調理完了後に調理装置の切り忘れや、調理中に長時間の調理中断が発生した場合でも、前記検出温度が第２の基準温度になるように制御しているので、この間の電力は無駄になり効率が悪く、安全上も問題があった。
【０００５】
本発明は上記のような問題点を解決するためになされたもので、調理完了後のスイッチの切り忘れや、調理中に長時間の調理中断が発生した場合でも、安全に、そして電力を無駄にすることのない加熱調理器を得ることを目的とする。
【０００６】
【課題を解決するための手段】
この発明に係わる加熱調理器は、調理容器内部の油の温度を検出する温度検出手段と、前記調理容器内部の油の温度が所定の設定温度となるようにヒータ又は誘導加熱コイルへの給電を制御する制御手段と、前記ヒータ又は誘導加熱コイルの電流を検出する電流検出手段とを備え、前記制御手段は、油の温度が天ぷら調理の設定温度に達した後、前記電流検出手段によって検出される電流の変化量が所定値以下の状態が所定時間継続した場合に、前記ヒータ又は誘導加熱コイルへの給電を停止させる。
【０００７】
【発明の実施の形態】
実施の形態１．
図１は、本実施の形態における加熱調理器の構成図である。
図１において、１は交流電源、２はスイッチ、３は制御回路、４は天ぷらモードスイッチ、５は出力調整ボリューム、６は図２に示すような、渦巻き状の誘導加熱コイル（以下、加熱コイル６という）、７は前記加熱コイル６の加熱コイル電流検出用抵抗、８は温度センサであり、図２に示すように前記加熱コイル６の中心部に配置され、天ぷら調理時の油の温度を間接的に検出する。９は耐熱ガラス、１０は前記耐熱ガラス９に載置され前記加熱コイル６と磁気結合して渦電流により誘導加熱される鍋である。
【０００８】
上記のように構成された加熱調理器の動作について説明する。
まず、前記スイッチ２が閉じられると、加熱調理器に前記交流電源１から電力が供給され動作を開始する。前記制御回路３は、前記加熱コイル６に高周波電流を流す。該加熱コイル６に高周波電流が流れると、磁束が発生し、この磁束が耐熱ガラス９に載置された前記鍋１０の底部と交差すると、該鍋１０の底部に渦電流が発生する。この渦電流と前記鍋１０の抵抗分でジュール熱が発生して鍋１０が発熱する。
【０００９】
前記出力調整ボリューム５は、前記加熱コイル６に流す電流を決定するもので、使用者が前記天ぷらモードスイッチ４をオフの状態で、前記出力調整ボリューム５を、図１に示すように（大）の右方向に回せば、前記制御回路３は前記加熱コイル６に流す電流を増やして前記鍋１０の温度を上げる。また、使用者が出力調整ボリューム５を（小）の左方向に回せば、前記制御回路３は前記加熱コイル６に流す電流を減らして前記鍋１０の温度を下げる。使用者は、調理状態を見て前記出力調整ボリューム５を調整して調理を行う。
【００１０】
そして、天ぷらモードスイッチ４がオフの状態においては、上述のように前記加熱コイル６へ流す電流は前記出力調整ボリューム５によって調整されるが、前記天ぷらモードスイッチ４がオンにされると、前記出力調整ボリューム５を無視して、前記制御回路３は前記温度センサ８によって検出した前記鍋１０内の油温度が、天ぷらを揚げるときの最適な設定温度、例えば１８０度となるように前記加熱コイル６の電流を制御する。
【００１１】
図３は、前記天ぷらモードスイッチ４をオンにして、天ぷらモードにした時の前記加熱コイル６の電流と前記温度センサ８の検出温度及び油の温度の変化の様子を表わしたものである。
尚、図中、（ａ）は油の温度、（ｂ）は温度センサ８の検出温度、（ｃ）は加熱コイル６の電流をそれぞれ示している。
天ぷらモードでは、前記制御回路３において目標の油の温度（図中Ｔ１）が例えば１８０度に設定されている。前記制御回路３は前記温度センサ８によって検出した鍋１０内の油の温度が、前記目標設定温度Ｔ１の１８０度となるように前記加熱コイル６の電流を制御する。図に示すように、実際の油の温度に対して、温度センサ８の検出温度は遅れて反応する。
【００１２】
その後、油の温度の温度上昇と共に前記加熱コイル６への投入電流を減らしていき、油の温度が天ぷら調理に最適な目標設定温度Ｔ１の１８０度に達したら、使用者は天ぷら調理を開始する。そして、天ぷら調理の食材を投入すると、鍋１０内の前記油の温度が図に示すように低下し、少し遅れて前記温度センサ８の検出温度も低下する。前記制御回路３は、前記温度センサ８の検出温度の低下情報を受けて、前記加熱コイル６への投入電流を図に示すように増加させ、前記油の温度が前記目標設定温度Ｔ１になるように制御する。
【００１３】
上記のように、前記温度センサ８からの検出温度によって前記鍋１０内の油の温度が目標設定温度Ｔ１に達したと判定した後、食材が投入されると油の温度が低下するので、その温度低下を補おうと、パルス的な加熱コイル６への電流を増加させる。前記加熱コイル電流検出用抵抗７は、流れる電流に応じて該加熱コイル電流検出用抵抗７の両端間に電圧降下が発生するので、この電圧降下を検出することで前記加熱コイル６へ流れる電流値が検知できる。前記制御回路３は、前記加熱コイル電流検出用抵抗７の電圧降下情報から電流の増加を検知して食材が投入されたと判定することができる。したがって、ここでは前記加熱コイル電流検出用抵抗７の電圧降下情報から、油の温度が前記設定温度Ｔ１に制御される加熱コイル電流の、所定値以上の電流変化量があった場合には、食材が投入されたと検知する。
【００１４】
そして、前記制御回路３内に例えばタイマー等（図示せず）を備えて、図３に示すように所定時間Ａ（例えば１分）が経過しても、食材の投入が検知されなかった場合（つまり、前記電流変化量が所定値以下）は、例えば使用者が調理を終了したにも拘わらず、加熱調理器の前記スイッチ２を切り忘れているか、または、調理中に電話等があり、調理を中断していると判定して、前記制御回路３で前記加熱コイル６への電流を遮断する。
【００１５】
以上のように、本実施の形態においては、加熱コイルへ流れる電流の変化量から、天ぷら調理中の食材の投入を検知し、天ぷら調理に最適な設定温度Ｔ１（例えば１８０度）で所定時間が経過しても食材の投入が検知されなければ、前記加熱コイルへの電流を遮断するようにしたので、調理完了にも拘わらずスイッチの切り忘れや、調理中に長時間の調理中断が発生した場合にも、安全に、そして電力を無駄にすることのない加熱調理器を得ることができる。
【００１６】
尚、本実施の形態においては、加熱手段として磁気結合して渦電流により鍋を誘導加熱する加熱コイルを一例として説明したが、これに限られるものではなく、例えば通常の電気ヒータでもよく、その際にも上述した同様の動作を行うことができる。
【００１７】
また、本実施の形態においては、油の温度を間接的に検出するようにしたが、これに限られるものではなく、例えば温度センサを鍋に取りつけて直接検出するようにしてもよい。
【００１８】
実施の形態２．
本実施の形態２における加熱調理器の構成は、上記実施の形態１の図１、図２と同様であるので、ここでの構成図及び説明を省略する。
図４は、本実施の形態２に係わる、天ぷらモード時の前記加熱コイル６の電流と前記温度センサ８の検出温度及び油の温度の変化の様子を表わしたものである。図４中、（ａ）は油の温度、（ｂ）は温度センサ８の検出温度、（ｃ）は加熱コイル６の電流をそれぞれ示している。また、図中、Ｔ１、Ｔ２、Ｔ３、Ｔ４は油の設定温度をそれぞれ示している。尚、図において加熱開始から油の温度が目標設定温度Ｔ１に達するまでの立ち上がり時の変化については、図示と説明を省略する。
【００１９】
天ぷらモード時、上記実施の形態１同様に、前記温度センサ８からの検出温度によって前記鍋１０内の油の温度が、天ぷら調理に最適な目標設定温度Ｔ１（例えば１８０度）に達したと判定した後、食材が投入されると油の温度が低下するので、その温度低下を補おうと、前記加熱コイル６への電流を増加させる。前記加熱コイル電流検出用抵抗７は、流れる電流に応じて該加熱コイル電流検出用抵抗７の両端間に電圧降下が発生するので、この電圧降下を検出することで前記加熱コイル６へ流れる電流値が検知できる。前記制御回路３は、前記加熱コイル電流検出用抵抗７の電圧降下情報から電流の増加を検知して食材が投入されたと判定することができる。したがって、ここでは前記加熱コイル電流検出用抵抗７の電圧降下情報から、油の温度が前記設定温度Ｔ１に制御される加熱コイル電流の、所定値以上の電流変化量があった場合には、食材が投入されたと検知する。尚、後述する設定温度Ｔ２、Ｔ３、Ｔ４においても同様に、夫々の設定温度に制御される加熱コイル電流の、所定値以上の電流変化量があった場合には、食材が投入されたと検知する。
【００２０】
そして、前記制御回路３内に上記実施の形態１同様に、例えばタイマー等を備えて、図４に示すように所定時間Ａ（例えば１分）が経過しても、食材の投入が検知されなかった場合（つまり、前記電流変化量が所定値以下）は、前述のように例えば使用者が調理を終了したにも拘わらず、前記スイッチ２を切り忘れているか、または、調理中に電話等があり、調理を中断していると判定して、油の温度の目標設定温度を前記天ぷら調理に最適な温度Ｔ１より低い、Ｔ２に設定して、その設定温度になるように制御回路３は前記加熱コイル６への投入電流を制御動作させる。
【００２１】
そして、図４に示すように所定時間Ｂ（例えば３０秒）が経過しても、食材の投入が検知されなかった場合は、油の温度の設定温度を前記Ｔ２より更に低いＴ３に設定して、その設定温度になるように制御回路３は前記加熱コイル６への投入電流を制御動作させる。そして、前記同様所定時間Ｂが経過しても、食材の投入が検知されなかった場合は、さらに前記油の温度の設定温度を前記Ｔ３より更に低いＴ４に設定して、その設定温度になるように制御回路３は前記加熱コイル６への投入電流を制御動作させ、前記同様所定時間Ｂが経過しても、食材の投入が検知されなかった場合は、前記制御回路３で前記加熱コイル６への電流を遮断する。このように、前記天ぷら調理に最適な油の設定温度Ｔ１で、所定時間Ａが経過しても食材の投入が検知されなかった場合、前記油の設定温度Ｔ１をＴ２、Ｔ３、Ｔ４と段階的に徐々に下げつつ、夫々前記所定時間Ｂで待機し、前記設定温度Ｔ４で前記所定時間Ｂが経過しても、食材の投入が検知されなかった場合は、前記制御回路３で前記加熱コイル６への電流を遮断する。
【００２２】
尚、本実施の形態において、油の設定温度をＴ１からＴ４の４段階として説明したが、これに限られるものではない。
【００２３】
ここで、例えば前記設定温度Ｔ２で前記所定時間Ｂの待機中に食材が投入され、前記制御回路３は、前記加熱コイル電流検出用抵抗７の電圧降下情報により、前述した加熱コイル電流の電流変化量から食材の投入が検知された場合について、図５を基に説明する。
図５中、（ａ）は油の温度、（ｂ）は温度センサ８の検出温度、（ｃ）は加熱コイル６の電流をそれぞれ示している。尚、加熱開始から前記油の温度が目標設定温度に達するまでの立ち上がり時の変化については、図示を省略する。
【００２４】
前記天ぷら調理に最適な設定温度Ｔ１（例えば１８０度）より低い、前記設定温度Ｔ２での前記所定時間Ｂの待機中に、図５に示すように、食材が投入されると油の温度が低下するので、その温度低下を補おうと、前記制御回路３は加熱コイル６への投入電流を増やすよう制御動作し、前記加熱コイル６の電流が増加する。
前記制御回路３は、前記加熱コイル電流検出用抵抗７の電圧降下情報で、前述した加熱コイル電流の電流変化量から食材の投入を検知し、前記油の設定温度をＴ２から前記天ぷら調理に最適な設定温度Ｔ１に戻し、再び前記設定温度Ｔ１になるように、加熱コイル６への投入電流を制御動作する。これによって、図５に示すように、加熱コイル６の電流や油の温度が上昇し、前記天ぷら調理に最適な設定温度Ｔ１で食材が調理される。
【００２５】
尚、上記実施の形態においては、前記設定温度Ｔ２での待機中に食材の投入が検知された場合に、該設定温度Ｔ２から前記天ぷら調理に最適な油の設定温度Ｔ１に戻す前記制御回路３の制御動作について説明したが、これに限られるものではなく、前記複数の設定温度での夫々の所定時間の待機中に、食材の投入を検知した場合も同様に、各設定温度から前記天ぷら調理に最適な油の設定温度Ｔ１に戻し、該設定温度Ｔ１になるように加熱コイル６への投入電流を前記制御回路３は制御動作させる。
【００２６】
以上のように、本実施の形態においては、加熱コイルへ流れる電流変化量から食材の投入を検知し、天ぷら調理に最適な油の設定温度Ｔ１（例えば１８０度）で所定時間Ａが経過しても食材の投入が検知されなければ、前記油の設定温度Ｔ１をＴ２、Ｔ３、Ｔ４と段階的に徐々に下げつつ、夫々所定時間Ｂで待機し、前記設定温度Ｔ４で所定時間Ｂが経過しても食材の投入が検知されなければ、前記加熱コイルへの電流を遮断するようにしたので、調理完了にも拘わらずスイッチの切り忘れや、調理中に長時間の調理中断が発生した場合にも、安全に、そして電力を無駄にすることがない。また、前記各設定温度Ｔ２、Ｔ３、Ｔ４での所定時間Ｂの待機中に例えば食材の投入が検知された場合には、各設定温度から前記天ぷら調理に最適な油の設定温度Ｔ１に戻すようにしたので、迅速に最適な油の温度での調理に対応することのできる加熱調理器を得ることができる。
【００２７】
尚、本実施の形態においては、加熱手段として磁気結合して渦電流により鍋を誘導加熱する加熱コイルを一例として説明したが、これに限られるものではなく、例えば通常の電気ヒータでもよく、その際にも上述した同様の動作を行うことができる。
【００２８】
また、本実施の形態においては、油の温度を間接的に検出するようにしたが、これに限られるものではなく、例えば温度センサを鍋に取りつけて直接検出するようにしてもよい。
【００２９】
実施の形態３．
図６は、本実施の形態３における加熱調理器の構成図である。尚、図６において、上記実施の形態１の図１と同一または相当部分には同一符号を付し説明を省略する。
図６において、１７は加熱調理器の入力電流検出用抵抗である。
【００３０】
上記実施の形態１、２においては、前記加熱コイル電流検出用抵抗７によって、該加熱コイル電流検出用抵抗７の両端間に発生する電圧降下情報により前記加熱コイル６へ流れる電流の電流変化量から食材の投入を検知するようにした。前記加熱コイル６へ流れる電流は、加熱調理器の入力電流と比例関係にあるので、本実施の形態においては、前記加熱コイル電流検出用抵抗７の代わりに、前記入力電流検出用抵抗１７を付加して、該入力電流検出用抵抗１７の両端間に発生する電圧降下情報から得られる加熱調理器への入力電流の電流変化量から食材投入を検知するようにしたものである。
【００３１】
本実施の形態では、上述の前記入力電流検出用抵抗１７の両端間に発生する電圧降下情報から得られる加熱調理器への入力電流の電流変化量から、食材投入を検知するようにしたことが上記実施の形態１、２と異なるもので、他の前記制御回路３の制御動作等は上記実施の形態１、２と同様であるので、ここでの説明を省略する。
【００３２】
以上のように、本実施の形態においては、加熱調理器への入力電流の電流変化量から食材の投入を検知し、天ぷら調理に最適な油の設定温度Ｔ１（例えば１８０度）で所定時間Ａが経過しても食材の投入が検知されなければ、前記加熱コイルへの電流を遮断する。または、前記最適な油の設定温度Ｔ１で所定時間Ａが経過しても食材の投入が検知されなければ、前記設定温度Ｔ１をＴ２、Ｔ３、Ｔ４と段階的に徐々に下げつつ、夫々所定時間Ｂで待機し、前記設定温度Ｔ４で所定時間Ｂが経過しても食材の投入が検知されなければ、前記加熱コイルへの電流を遮断するようにしたので、上記実施の形態１、２同様に、調理完了にも拘わらずスイッチの切れ忘れや、調理中に長時間の調理中断が発生した場合にも、安全に、そして電力を無駄にすることがない。また、前記各設定温度Ｔ２、Ｔ３、Ｔ４での所定時間Ｂの待機中に食材の投入が検知された場合には、前記各設定温度から前記天ぷら調理に最適な油の設定温度Ｔ１に戻すようにしたので、迅速に最適な油の温度での調理に対応することのできる加熱調理器を得ることができる。
【００３３】
尚、本実施の形態においては、加熱手段として磁気結合して渦電流により鍋を誘導加熱する加熱コイルを一例として説明したが、これに限られるものではなく、例えば通常の電気ヒータでもよく、その際にも上述した同様の動作を行うことができる。
【００３４】
また、本実施の形態においては、油の温度を間接的に検出するようにしたが、これに限られるものではなく、例えば温度センサを鍋に取りつけて直接検出するようにしてもよい。
【００３５】
実施の形態４．
図７は、本実施の形態４における加熱調理器の構成図である。尚、図７において、上記実施の形態１の図１と同一または相当部分には同一符号を付し説明を省略する。
【００３６】
本実施の形態は、上記実施の形態１の他の形態を示すものである。
上記実施の形態１では、加熱コイル６への電流を検出するための前記加熱コイル電流検出用抵抗７を備え、該加熱コイル電流検出用抵抗７での電圧降下情報から得られる加熱コイル電流の電流変化量から食材の投入を検知し、所定時間Ａ（例えば１分）が経過しても食材の投入が検知されなかった場合（つまり、上述した例えば電流変化量が所定値以下）は、前記制御回路３で前記加熱コイル６への電流を遮断するようにした。
【００３７】
本実施の形態においては、図７に示すように前記加熱コイル電流検出用抵抗７は備えておらず、上記実施の形態１で説明したように、食材が投入されると油の温度及び温度センサ８の検出温度が天ぷら調理の油の設定温度Ｔ１から低下するので、その温度変化を利用して、前記温度センサ８の検出温度に所定値以上（つまり設定温度Ｔ１に対して所定値以上）の温度変化量があった場合には、その温度変化量から前記制御回路３で食材の投入を検知し、所定時間Ａ（例えば１分）が経過しても前記温度センサ８の検出温度に前記所定値以上の温度変化量がない場合、つまり食材の投入が検知されなかった場合、前記制御回路３で前記加熱コイル６への電流を遮断するようにしたものである。
【００３８】
上記のように、本実施の形態では、温度センサ８の検出温度の温度変化量から食材の投入を検知し、所定時間Ａが経過しても前記温度センサ８の検出温度に所定値以上の温度変化量がない場合に、前記加熱コイル６への電流を遮断するようにしたことが、上記実施の形態１と異なるもので、他の前記制御回路３の制御動作等は上記実施の形態１と同様であるので、ここでの説明を省略する。
【００３９】
図８に本実施の形態に係る前記加熱コイル６の電流と前記温度センサ８の検出温度及び油の温度の変化の様子を表わす。
図８中、（ａ）は油の温度、（ｂ）は温度センサ８の検出温度、（ｃ）は加熱コイル６の電流をそれぞれ示している。尚、加熱開始から油の温度が目標設定温度Ｔ１に達するまでの立ち上がり時の変化については、図示を省略する。
【００４０】
以上のように、本実施の形態においては、温度センサの検出温度の温度変化量から食材の投入を検知し、天ぷら調理に最適な設定温度Ｔ１（例えば１８０度）で所定時間が経過しても前記温度センサの検出温度に所定値以上の温度変化量がない、つまり食材投入の検知がなければ、前記加熱コイルへの電流を遮断するようにしたので、上記実施の形態１に比べ、より簡易な構成で、例えば調理完了にも拘わらずスイッチの切り忘れや、調理中に長時間の調理中断が発生した場合にも、上記実施の形態１同様に安全に、そして電力を無駄にすることのない加熱調理器を得ることができる。
【００４１】
尚、本実施の形態においては、加熱手段として磁気結合して渦電流により鍋を誘導加熱する加熱コイルを一例として説明したが、これに限られるものではなく、例えば通常の電気ヒータでもよく、その際にも上述した同様の動作を行うことができる。
【００４２】
また、本実施の形態においては、油の温度を間接的に検出するようにしたが、これに限られるものではなく、例えば温度センサを鍋に取りつけて直接検出するようにしてもよい。
【００４３】
実施の形態５．
本実施の形態５における加熱調理器の構成は、上記実施の形態４の図７と同様であるので、ここでの構成図及び説明を省略する。
【００４４】
本実施の形態は、上記実施の形態２の他の形態を示すものである。
上記実施の形態２では実施の形態１と同様に、前記加熱コイル電流検出用抵抗７での電圧降下情報から得られる加熱コイル６への電流変化量から食材の投入を検知し、天ぷら調理に最適な油の設定温度Ｔ１（例えば１８０度）で所定時間Ａ（例えば１分）が経過しても、所定値以上の電流変化量がない、つまり食材の投入が検知されなかった場合、前記油の設定温度Ｔ１をＴ２、Ｔ３、Ｔ４と段階的に徐々に下げつつ、夫々所定時間Ｂ（例えば３０秒）で待機し、前記設定温度Ｔ４で前記所定時間Ｂが経過しても食材の投入が検知されなかった場合は、前記制御回路３で前記加熱コイル６への電流を遮断するようにした。
【００４５】
また、上記実施の形態２では、例えば前記設定温度Ｔ２で前記所定時間Ｂの待機中に、加熱コイル６への電流変化量から食材の投入が検知された場合には、前記制御回路３で前記油の設定温度Ｔ２から前記天ぷら調理に最適な油の設定温度Ｔ１に戻し、再び前記設定温度Ｔ１になるように、加熱コイル６への投入電流を制御動作した。
【００４６】
本実施の形態においては、上記実施の形態４と同様に、前記温度センサ８の検出温度の温度変化量から食材の投入を検知し、前記天ぷら調理に最適な油の設定温度Ｔ１（例えば１８０度）で所定時間Ａ（例えば１分）が経過しても、前記温度センサ８の検出温度に所定値以上（つまり、前述した設定温度Ｔ１に対して所定値以上）の温度変化量がない、つまり食材の投入が検知されなかった場合は、前記油の設定温度Ｔ１をＴ２、Ｔ３、Ｔ４と段階的に徐々に下げつつ、夫々所定時間Ｂ（例えば３０秒）で待機し、前記設定温度Ｔ４で前記所定時間Ｂが経過しても食材の投入が検知されなかった場合は、前記制御回路３で前記加熱コイル６への電流を遮断するものである。尚、前記設定温度Ｔ２、Ｔ３、Ｔ４においても同様に、夫々の設定温度に対しての所定値以上の温度変化量があった場合には、食材が投入されたと検知する。
【００４７】
また、本実施の形態においては、例えば前記設定温度Ｔ２で前記所定時間Ｂの待機中に、前記温度センサ８の検出温度に所定値以上の温度変化量があった場合、つまり食材の投入が検知された場合には、前記制御回路３で前記油の設定温度Ｔ２から前記天ぷら調理に最適な油の設定温度Ｔ１に戻し、再び前記設定温度Ｔ１になるように、加熱コイル６への投入電流を制御動作するものである。
【００４８】
上記のように、本実施の形態では、温度センサ８の検出温度の温度変化量から食材の投入を検知し、その温度センサ８の検出温度変化情報を基に、所定時間Ａ及び所定時間Ｂで待機させるようにしたことが、上記実施の形態２と異なるもので、他の前記制御回路３の制御動作等は上記実施の形態２と同様であるので、ここでの説明を省略する。
【００４９】
図９に本実施の形態に係る前記加熱コイル６の電流と前記温度センサ８の検出温度及び油の温度の変化の様子を、図１０に例えば前記設定温度Ｔ２で所定時間の待機中に食材の投入が検知された場合の、前記加熱コイル６の電流と前記温度センサ８の検出温度及び油の温度の変化の様子をそれぞれ示す。
図９、図１０中、（ａ）は油の温度、（ｂ）は温度センサ８の検出温度、（ｃ）は加熱コイル６の電流をそれぞれ示している。また、図中、Ｔ１、Ｔ２、Ｔ３、Ｔ４は油の設定温度をそれぞれ示している。
尚、加熱開始から油の温度が目標設定温度Ｔ１に達するまでの立ち上がり時の変化については、図示を省略する。
【００５０】
尚、本実施の形態において、前記設定温度Ｔ２の待機中に食材の投入が検知された場合に、該設定温度Ｔ２から前記天ぷら調理に最適な油の設定温度Ｔ１（例えば１８０度）に戻す前記制御回路３の制御動作について説明したが、これに限られるものではなく、前記複数の設定温度での夫々の所定時間の待機中に食材が投入された場合も同様に、各設定温度から前記天ぷら調理に最適な油の設定温度Ｔ１に戻し、該設定温度Ｔ１になるように、加熱コイル６への投入電流を前記制御回路３は制御動作させる。
【００５１】
また、本実施の形態において、油の設定温度をＴ１からＴ４の４段階として説明したが、これに限られるものではない。
【００５２】
以上のように、本実施の形態においては、温度センサの検出温度の温度変化量から食材の投入を検知し、天ぷら調理に最適な油の設定温度Ｔ１（例えば１８０度）で所定時間Ａ（例えば１分）が経過しても前記温度センサの検出温度に所定値以上の温度変化量がない、つまり食材投入の検知がなければ、前記油の設定温度Ｔ１を例えばＴ２、Ｔ３、Ｔ４と段階的に徐々に下げつつ、夫々所定時間Ｂ（例えば３０秒）で待機し、前記設定温度Ｔ４で前記所定時間Ｂが経過しても食材の投入が検知されなかった場合は、前記制御回路３で前記加熱コイル６への電流を遮断する。また、前記設定温度Ｔ２、Ｔ３、Ｔ４での夫々の前記所定時間Ｂの待機中に、例えば食材の投入が検知された場合には、前記各設定温度Ｔ２、Ｔ３、Ｔ４から前記天ぷら調理に最適な油の設定温度Ｔ１に戻すようにしたので、上記実施の形態２に比べ、より簡易な構成で、例えば調理完了にも拘わらずスイッチの切り忘れや、調理中に長時間の調理中断が発生した場合にも、安全に、そして電力を無駄にすることがない。また、迅速に最適な油の温度での調理に対応することのできる加熱調理器を得ることができる。
【００５３】
尚、本実施の形態においては、加熱手段として磁気結合して渦電流により鍋を誘導加熱する加熱コイルを一例として説明したが、これに限られるものではなく、例えば通常の電気ヒータでもよく、その際にも上述した同様の動作を行うことができる。
【００５４】
また、本実施の形態においては、油の温度を間接的に検出するようにしたが、これに限られるものではなく、例えば温度センサを鍋に取りつけて直接検出するようにしてもよい。
【００５５】
実施の形態６．
図１１は、本実施の形態６における加熱調理器の構成図である。
尚、図１１において、上記実施の形態１の図１と同一又は相当部分には同一符号を付し説明を省略する。
図１１において、１１は前記鍋１０内の油の中に食材が投入されたときの食材投入音を検出する例えばマイクロフォンである。
【００５６】
本実施の形態においては、上記実施の形態１の、さらに他の形態を示すものである。
図１２は本実施の形態に係る加熱コイル電流、温度センサ検出温度、油の温度及び食材投入音の動作変化の様子を表した図である。
図１２中、（ａ）は油の温度、（ｂ）は温度センサ８の検出温度、（ｃ）は加熱コイル６の電流、（ｄ）は食材投入音をそれぞれ示している。
【００５７】
本実施の形態においては、前記食材投入音を検出するマイクロフォン１１を付加して、食材の投入による前記マイクロフォン１１で検出される食材投入音レベルが、図１２に示すように例えばＳ１以上あり、かつ、前述した前記油の設定温度Ｔ１に制御される加熱コイル電流の、所定値以上の電流変化量があった場合には、前記制御回路３で食材が投入されたと検知するものである。
【００５８】
そして、所定時間Ａ（例えば１分）が経過しても食材の投入が検知されなかった場合（つまり、食材投入音レベルがＳ１以下で、前記電流変化量が所定値以下）は、例えば使用者が調理を終了したにも拘わらず、加熱調理器のスイッチを切り忘れているか、または、調理中に電話等があり、調理を中断していると判定して、前記制御回路３で前記加熱コイル６への電流を遮断する。
【００５９】
本実施の形態では、前記食材投入音を検出するマイクロフォン１１を付加して、前記制御回路３では、前記マイクロフォン１１による食材投入音レベル情報と、前記加熱コイル電流の電流変化量情報とで食材の投入を検知するようにしたことが上記実施の形態１と異なるもので、他の前記制御回路３の制御動作等は上記実施の形態１と同様であるので、ここでの説明を省略する。
【００６０】
以上のように、本実施の形態においては、例えば食材が投入されていないのに、ノイズ等により前記温度センサ８の検出温度が低下した場合、前記制御回路３は前記加熱コイル６への電流を増加させてしまうため、前記食材投入音を検出するマイクロフォン１１を付加したことによって、より確実に食材の投入を検知をすることができ、そして安全に、また電力を無駄にすることのない加熱調理器を得ることができる。
【００６１】
尚、本実施の形態においては、加熱手段として磁気結合して渦電流により鍋を誘導加熱する加熱コイルを一例として説明したが、これに限られるものではなく、例えば通常の電気ヒータでもよく、その際にも上述した同様の動作を行うことができる。
【００６２】
また、本実施の形態においては、油の温度を間接的に検出するようにしたが、これに限られるものではなく、例えば温度センサを鍋に取りつけて直接検出するようにしてもよい。
【００６３】
また、本実施の形態においては、加熱コイル電流検出用抵抗７を用いての電圧降下情報から得られる加熱コイル電流の電流変化量を用いた例で説明したが、上記実施の形態３の入力電流検出用抵抗１７を用いた場合にも同様の制御動作を行うことができるものである。
【００６４】
また、本実施の形態においては、前記食材投入音レベル情報と、前記加熱コイル電流の電流変化量情報とで食材の投入を検知するようにしたが、これに限られるものではなく、例えば前記食材投入音レベル情報と、前記温度センサの検出温度情報とで食材の投入を検知するようにして、上記同様の制御動作を行うようにしてもよい。
【００６５】
【発明の効果】
この発明は以上説明したように、調理容器内部の油の温度を検出する温度検出手段と、前記調理容器内部の油の温度が所定の設定温度となるようにヒータ又は誘導加熱コイルへの給電を制御する制御手段と、前記ヒータ又は誘導加熱コイルの電流を検出する電流検出手段とを備え、前記制御手段は、油の温度が天ぷら調理の設定温度に達した後、前記電流検出手段によって検出される電流の変化量が所定値以下の状態が所定時間継続した場合に、前記ヒータ又は誘導加熱コイルへの給電を停止させるようにしたので、例えば天ぷら調理完了にも拘わらずスイッチの切り忘れや、天ぷら調理中に長時間の調理中断が発生した場合にも、安全に、そして電力を無駄にすることのない加熱調理器を得ることができる。
【図面の簡単な説明】
【図１】この発明の実施の形態１における加熱調理器の構成図である。
【図２】実施の形態１に係る加熱コイルと温度センサ部分を表した図である。
【図３】実施の形態１に係る加熱コイル電流と温度センサ検出温度及び油の温度の動作変化の様子を表した図である。
【図４】この発明の実施の形態２における加熱コイル電流と温度センサ検出温度及び油の温度の動作変化の様子を表した図である。
【図５】実施の形態２に係る食材の投入を検知したときの加熱コイル電流と温度センサ検出温度及び油の温度の動作変化の様子を表した図である。
【図６】この発明の実施の形態３における加熱調理器の構成図である。
【図７】この発明の実施の形態４における加熱調理器の構成図である。
【図８】実施の形態４に係る加熱コイル電流と温度センサ検出温度及び油の温度の動作変化の様子を表した図である。
【図９】この発明の実施の形態５における加熱コイル電流と温度センサ検出温度及び油の温度の動作変化の様子を表した図である。
【図１０】実施の形態５に係る食材の投入を検知したときの加熱コイル電流と温度センサ検出温度及び油の温度の動作変化の様子を表した図である。
【図１１】この発明の実施の形態６における加熱調理器の構成図である。
【図１２】実施の形態６に係る加熱コイル電流、温度センサ検出温度、油の温度及び食材投入音の動作変化の様子を表した図である。
【図１３】従来の加熱調理器の動作変化の様子を表した図である。
【符号の説明】
１交流電源、２スイッチ、３制御回路、４天ぷらモードスイッチ、５出力調整ボリューム、６加熱コイル、７加熱コイル電流検出用抵抗、８温度センサ、９耐熱ガラス、１０鍋、１１マイクロフォン、１７入力電流検出用抵抗。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cooking device capable of cooking tempura.
[0002]
[Prior art]
FIG. 13 shows a state of a control operation during tempura cooking of a conventional heating cooker.
In the conventional heating cooker, the oil temperature inside the cooking vessel is raised by controlling the heating coil so that the detected temperature becomes the first reference temperature, and then the detected temperature becomes the second reference temperature. To make the oil temperature equal to the set temperature. In the meantime, when the state in which the detected temperature becomes equal to or lower than the load input detection temperature continues for a predetermined time, it is determined that food has been input, and the detected temperature is set to a third reference temperature higher than the second reference temperature. By controlling, the decrease in oil temperature caused by the input of food is quickly recovered (for example, Patent Document 1).
[0003]
[Patent Document 1]
JP 2000-100554 A
[0004]
[Problems to be solved by the invention]
The conventional heating cooker controls the detected temperature to be the second reference temperature even when the cooking device is forgotten to be turned off after the cooking is completed or when cooking is interrupted for a long time during cooking. Power was wasted and inefficient, and there was a problem with safety.
[0005]
The present invention has been made in order to solve the above-described problems, and can safely and waste power even when the switch is forgotten to be turned off after completion of cooking or when cooking is interrupted for a long time during cooking. It is an object of the present invention to obtain a heating cooker that does not perform cooking.
[0006]
[Means for Solving the Problems]
A heating cooker according to the present invention includes a temperature detecting unit that detects a temperature of oil inside a cooking vessel, and a power supply to a heater or an induction heating coil such that the temperature of oil inside the cooking vessel becomes a predetermined set temperature. Control means for controlling, and current detection means for detecting a current of the heater or the induction heating coil, wherein the control means is detected by the current detection means after the temperature of the oil reaches the set temperature of the tempura cooking. When the amount of change in the electric current is equal to or less than a predetermined value for a predetermined time, the power supply to the heater or the induction heating coil is stopped.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a heating cooker according to the present embodiment.
In FIG. 1, 1 is an AC power supply, 2 is a switch, 3 is a control circuit, 4 is a tempura mode switch, 5 is an output adjustment volume, and 6 is a spiral induction heating coil (hereinafter, heating coil) as shown in FIG. 6), 7 is a resistor for detecting the heating coil current of the heating coil 6, and 8 is a temperature sensor which is disposed at the center of the heating coil 6 as shown in FIG. Detect indirectly. 9 is a heat-resistant glass and 10 is a pot placed on the heat-resistant glass 9 and magnetically coupled to the heating coil 6 and induction-heated by eddy current.
[0008]
The operation of the heating cooker configured as described above will be described.
First, when the switch 2 is closed, the electric power is supplied from the AC power supply 1 to the cooking device to start the operation. The control circuit 3 supplies a high-frequency current to the heating coil 6. When a high-frequency current flows through the heating coil 6, a magnetic flux is generated. When the magnetic flux crosses the bottom of the pan 10 placed on the heat-resistant glass 9, an eddy current is generated at the bottom of the pan 10. Joule heat is generated by the eddy current and the resistance of the pot 10, and the pot 10 generates heat.
[0009]
The output adjustment volume 5 is for determining the current flowing through the heating coil 6. When the user turns off the tempura mode switch 4, the output adjustment volume 5 is adjusted as shown in FIG. 1 (large). When the control circuit 3 is turned clockwise, the control circuit 3 increases the current flowing through the heating coil 6 to increase the temperature of the pan 10. When the user turns the output adjustment volume 5 to the left (small), the control circuit 3 reduces the current flowing through the heating coil 6 to lower the temperature of the pan 10. The user adjusts the output adjustment volume 5 while watching the cooking state, and performs cooking.
[0010]
When the tempura mode switch 4 is off, the current flowing through the heating coil 6 is adjusted by the output adjustment volume 5 as described above. However, when the tempura mode switch 4 is turned on, the output is reduced. Disregarding the adjustment volume 5, the control circuit 3 sets the heating coil 6 so that the oil temperature in the pan 10 detected by the temperature sensor 8 becomes an optimal set temperature for frying the tempura, for example, 180 degrees. To control the current.
[0011]
FIG. 3 shows how the current of the heating coil 6, the temperature detected by the temperature sensor 8 and the temperature of the oil change when the tempura mode switch 4 is turned on to set the tempura mode.
In the drawings, (a) shows the temperature of the oil, (b) shows the temperature detected by the temperature sensor 8, and (c) shows the current of the heating coil 6, respectively.
In the tempura mode, the control circuit 3 sets the target oil temperature (T1 in the figure) to, for example, 180 degrees. The control circuit 3 controls the current of the heating coil 6 so that the temperature of the oil in the pan 10 detected by the temperature sensor 8 becomes 180 degrees of the target set temperature T1. As shown in the figure, the temperature detected by the temperature sensor 8 reacts with a delay with respect to the actual oil temperature.
[0012]
Thereafter, the input current to the heating coil 6 is reduced as the temperature of the oil increases, and when the temperature of the oil reaches 180 ° C., which is the target set temperature T1 optimal for cooking the tempura, the user starts cooking the tempura. . When the ingredients for cooking the tempura are introduced, the temperature of the oil in the pan 10 decreases as shown in the figure, and the detection temperature of the temperature sensor 8 also decreases a little later. The control circuit 3 receives the information on the decrease in the temperature detected by the temperature sensor 8 and increases the current supplied to the heating coil 6 as shown in the figure so that the oil temperature becomes the target set temperature T1. To control.
[0013]
As described above, after it is determined that the temperature of the oil in the pan 10 has reached the target set temperature T1 based on the temperature detected by the temperature sensor 8, the temperature of the oil drops when food is introduced, so that To compensate for the temperature drop, the pulsed current to the heating coil 6 is increased. The heating coil current detection resistor 7 generates a voltage drop across the heating coil current detection resistor 7 in accordance with the flowing current. By detecting this voltage drop, the current value flowing to the heating coil 6 Can be detected. The control circuit 3 can detect an increase in current from the voltage drop information of the heating coil current detection resistor 7 and determine that the food has been introduced. Therefore, in this case, based on the voltage drop information of the heating coil current detection resistor 7, if there is a current variation of a predetermined value or more in the heating coil current at which the oil temperature is controlled to the set temperature T1, the food material Is detected.
[0014]
Then, for example, a timer or the like (not shown) is provided in the control circuit 3, and even if a predetermined time A (for example, 1 minute) has elapsed as shown in FIG. That is, the current change amount is equal to or less than the predetermined value), for example, even though the user has finished cooking, he has forgotten to turn off the switch 2 of the heating cooker, or there is a telephone call during cooking, and When it is determined that the current is interrupted, the control circuit 3 cuts off the current to the heating coil 6.
[0015]
As described above, in the present embodiment, the input of the ingredients during the cooking of the tempura is detected from the change amount of the current flowing to the heating coil, and the predetermined time is set at the optimal set temperature T1 (for example, 180 degrees) for the tempura cooking. If the input of the food is not detected even after the lapse of time, the current to the heating coil is cut off, so if the switch is forgotten or the cooking is interrupted for a long time during the cooking even though the cooking is completed. In addition, it is possible to obtain a cooking device that is safe and does not waste power.
[0016]
In the present embodiment, as an example of the heating means, a heating coil that is magnetically coupled and induction-heats a pan by eddy current is described as an example.However, the present invention is not limited to this. For example, a normal electric heater may be used. At this time, the same operation as described above can be performed.
[0017]
Further, in the present embodiment, the temperature of the oil is indirectly detected. However, the present invention is not limited to this. For example, the temperature may be directly detected by attaching a temperature sensor to a pot.
[0018]
Embodiment 2 FIG.
Since the configuration of the heating cooker according to the second embodiment is the same as that of FIGS. 1 and 2 of the first embodiment, the configuration diagram and description thereof will be omitted.
FIG. 4 shows how the current of the heating coil 6, the temperature detected by the temperature sensor 8, and the temperature of the oil change in the tempura mode according to the second embodiment. 4A shows the temperature of the oil, FIG. 4B shows the temperature detected by the temperature sensor 8, and FIG. 4C shows the current of the heating coil 6, respectively. In the drawing, T1, T2, T3, and T4 indicate the set temperatures of the oil, respectively. It should be noted that, in the figure, the change at the time of starting from the start of heating until the oil temperature reaches the target set temperature T1 is not shown and described.
[0019]
In the tempura mode, similarly to the first embodiment, it is determined that the temperature of the oil in the pan 10 has reached the target set temperature T1 (for example, 180 degrees) that is optimal for cooking the tempura based on the temperature detected by the temperature sensor 8. After that, when the food is put in, the temperature of the oil drops, so the current to the heating coil 6 is increased to compensate for the temperature drop. The heating coil current detection resistor 7 generates a voltage drop across the heating coil current detection resistor 7 in accordance with the flowing current. By detecting this voltage drop, the current value flowing to the heating coil 6 Can be detected. The control circuit 3 can detect an increase in current from the voltage drop information of the heating coil current detection resistor 7 and determine that the food has been introduced. Therefore, in this case, based on the voltage drop information of the heating coil current detection resistor 7, if there is a current variation of a predetermined value or more in the heating coil current at which the oil temperature is controlled to the set temperature T1, the food material Is detected. Similarly, at the set temperatures T2, T3, and T4 to be described later, if there is a change in the heating coil current controlled to each set temperature equal to or more than a predetermined value, it is detected that the food has been input. .
[0020]
Then, similarly to the first embodiment, for example, a timer or the like is provided in the control circuit 3, and even if a predetermined time A (for example, one minute) elapses as shown in FIG. (That is, the current change amount is equal to or less than a predetermined value), as described above, for example, the user has forgotten to turn off the switch 2 despite the completion of cooking, or there is a telephone call during cooking. It is determined that cooking is interrupted, and the control circuit 3 sets the target set temperature of the oil temperature to T2, which is lower than the optimum temperature T1 for the cooking of the tempura, and sets the target temperature to the set temperature. A control is performed to control a current supplied to the coil 6.
[0021]
Then, as shown in FIG. 4, even if the predetermined time B (for example, 30 seconds) elapses, if the input of the food is not detected, the set temperature of the oil temperature is set to T3 which is lower than T2. The control circuit 3 controls the supply current to the heating coil 6 so that the set temperature is reached. If the input of the food is not detected even after the lapse of the predetermined time B as described above, the set temperature of the oil temperature is further set to T4 lower than the T3 so as to reach the set temperature. The control circuit 3 controls the input current to the heating coil 6 to control the operation. If the input of the food is not detected even after the predetermined time B has elapsed as described above, the control circuit 3 controls the input to the heating coil 6. Cut off the current. As described above, when the input of the food is not detected after the predetermined time A has elapsed at the optimal oil setting temperature T1 for the tempura cooking, the oil setting temperature T1 is gradually changed to T2, T3, and T4. When the food is not detected even after the predetermined time B has elapsed at the set temperature T4, the control circuit 3 controls the heating coil 6 to stand by. Cut off the current to the.
[0022]
In this embodiment, the set temperature of the oil is described as four steps from T1 to T4, but the present invention is not limited to this.
[0023]
Here, for example, during the standby for the predetermined time B at the set temperature T2, food is put in, and the control circuit 3 uses the voltage drop information of the heating coil current detection resistor 7 to change the heating coil current described above. The case where the input of the foodstuff is detected from the amount will be described with reference to FIG.
5A shows the oil temperature, FIG. 5B shows the temperature detected by the temperature sensor 8, and FIG. 5C shows the current of the heating coil 6. It should be noted that the change at the time of rising from the start of the heating until the temperature of the oil reaches the target set temperature is not shown.
[0024]
As shown in FIG. 5, during the standby for the predetermined time B at the set temperature T2, which is lower than the set temperature T1 (for example, 180 degrees) that is optimal for the tempura cooking, as shown in FIG. Therefore, to compensate for the temperature drop, the control circuit 3 performs a control operation so as to increase the input current to the heating coil 6, and the current of the heating coil 6 increases.
The control circuit 3 detects, based on the voltage drop information of the heating coil current detection resistor 7, the input of foodstuffs from the above-described current change amount of the heating coil current, and sets the oil set temperature from T2 to the tempura cooking optimally. The temperature is returned to the preset temperature T1, and the current supplied to the heating coil 6 is controlled so as to return to the preset temperature T1 again. As a result, as shown in FIG. 5, the current of the heating coil 6 and the temperature of the oil rise, and the food is cooked at the set temperature T1 that is optimal for the above-mentioned tempura cooking.
[0025]
In the above-described embodiment, when the input of the food is detected during the standby at the set temperature T2, the control circuit 3 returns the set temperature T2 to the oil set temperature T1 optimal for the cooking of the fried chicken. However, the present invention is not limited to this, and when the input of food is detected during the standby of each of the plurality of set temperatures for a predetermined time, the cooking of the tempura is similarly performed from each set temperature. The control circuit 3 controls the supply current to the heating coil 6 so as to return to the optimum oil set temperature T1 so as to reach the set temperature T1.
[0026]
As described above, in the present embodiment, the input of food is detected from the amount of change in the current flowing to the heating coil, and the predetermined time A has elapsed at the oil setting temperature T1 (eg, 180 degrees) that is optimal for tempura cooking. If the input of the foodstuff is not detected, the set temperature T1 of the oil is gradually decreased stepwise to T2, T3, and T4, and the apparatus stands by for a predetermined time B, and the predetermined time B elapses at the set temperature T4. Even if the input of food is not detected, the current to the heating coil is cut off, so even if the user forgets to turn off the switch despite completion of cooking or if cooking is interrupted for a long time during cooking. Safe, no power wasted. If, for example, the input of food is detected during the predetermined time B at each of the set temperatures T2, T3, and T4, the temperature is returned from each set temperature to the optimum oil set temperature T1 for the tempura cooking. Therefore, it is possible to obtain a heating cooker that can quickly cope with cooking at an optimum oil temperature.
[0027]
In the present embodiment, as an example of the heating means, a heating coil that is magnetically coupled and induction-heats the pan by eddy current is described as an example.However, the present invention is not limited to this. At this time, the same operation as described above can be performed.
[0028]
Further, in the present embodiment, the temperature of the oil is indirectly detected. However, the present invention is not limited to this. For example, the temperature may be directly detected by attaching a temperature sensor to a pot.
[0029]
Embodiment 3 FIG.
FIG. 6 is a configuration diagram of the heating cooker according to the third embodiment. In FIG. 6, the same or corresponding parts as in FIG. 1 of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
In FIG. 6, reference numeral 17 denotes an input current detection resistor of the cooking device.
[0030]
In the first and second embodiments, the amount of change in the current flowing to the heating coil 6 is determined by the heating coil current detection resistor 7 based on voltage drop information generated between both ends of the heating coil current detection resistor 7. Detecting the input of food. Since the current flowing to the heating coil 6 is proportional to the input current of the heating cooker, in the present embodiment, the input current detection resistor 17 is added instead of the heating coil current detection resistor 7. Then, the input of food is detected from the amount of change in the input current to the heating cooker obtained from the voltage drop information generated between both ends of the input current detection resistor 17.
[0031]
In the present embodiment, the input of food is detected from the current change amount of the input current to the heating cooker obtained from the voltage drop information generated between both ends of the input current detection resistor 17 described above. The third embodiment is different from the first and second embodiments, and the control operation and the like of the other control circuit 3 are the same as those of the first and second embodiments.
[0032]
As described above, in the present embodiment, the input of food is detected from the amount of change in the input current to the heating cooker, and a predetermined time A is set at the optimal oil set temperature T1 (for example, 180 degrees) for tempura cooking. If the input of the food is not detected even after elapse, the current to the heating coil is cut off. Alternatively, if the input of the food is not detected even after the predetermined time A has elapsed at the optimal oil set temperature T1, the set temperature T1 is gradually decreased to T2, T3, and T4, and the predetermined temperature is gradually decreased. B, the current to the heating coil is cut off if the input of food is not detected even after the predetermined time B has elapsed at the set temperature T4, as in the first and second embodiments. Even if the user forgets to turn off the switch despite the completion of cooking, or if cooking is interrupted for a long time during cooking, power is not safely and safely wasted. In addition, when the input of food is detected during the standby for the predetermined time B at each of the set temperatures T2, T3, and T4, the temperature is returned from the set temperature to the optimum oil set temperature T1 for the tempura cooking. Therefore, it is possible to obtain a heating cooker that can quickly cope with cooking at an optimum oil temperature.
[0033]
In the present embodiment, as an example of the heating means, a heating coil that is magnetically coupled and induction-heats the pan by eddy current is described as an example.However, the present invention is not limited to this. At this time, the same operation as described above can be performed.
[0034]
Further, in the present embodiment, the temperature of the oil is indirectly detected. However, the present invention is not limited to this. For example, the temperature may be directly detected by attaching a temperature sensor to a pot.
[0035]
Embodiment 4 FIG.
FIG. 7 is a configuration diagram of the heating cooker according to the fourth embodiment. In FIG. 7, the same or corresponding parts as those in FIG. 1 of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0036]
This embodiment shows another embodiment of the first embodiment.
In the first embodiment, the heating coil current detection resistor 7 for detecting the current to the heating coil 6 is provided, and the current of the heating coil current obtained from the voltage drop information at the heating coil current detection resistor 7 is provided. If the input of the food is detected from the change amount, and the input of the food is not detected even after the predetermined time A (for example, 1 minute) has elapsed (that is, the above-described current change amount is equal to or less than the predetermined value), the control is performed. The circuit 3 cuts off the current to the heating coil 6.
[0037]
In the present embodiment, as shown in FIG. 7, the heating coil current detecting resistor 7 is not provided, and as described in the first embodiment, when the food is supplied, the oil temperature and the temperature sensor are set. 8, the temperature detected by the temperature sensor 8 is lower than a predetermined value (that is, a predetermined value or more with respect to the set temperature T1). If there is a temperature change, the control circuit 3 detects the input of the food from the temperature change, and keeps the temperature detected by the temperature sensor 8 at the predetermined temperature A even after a predetermined time A (for example, one minute) has elapsed. When there is no temperature change amount equal to or more than the value, that is, when the input of food is not detected, the control circuit 3 cuts off the current to the heating coil 6.
[0038]
As described above, in the present embodiment, the input of food is detected from the amount of change in the temperature detected by the temperature sensor 8 and the temperature detected by the temperature sensor 8 exceeds the predetermined value even after the predetermined time A has elapsed. The fact that the current to the heating coil 6 is cut off when there is no change is different from the first embodiment, and the control operation of the other control circuit 3 is the same as that of the first embodiment. The description is omitted here because it is the same.
[0039]
FIG. 8 shows the state of changes in the current of the heating coil 6, the temperature detected by the temperature sensor 8, and the oil temperature according to the present embodiment.
8, (a) shows the temperature of the oil, (b) shows the temperature detected by the temperature sensor 8, and (c) shows the current of the heating coil 6, respectively. It is to be noted that the change at the time of rising from the start of heating until the oil temperature reaches the target set temperature T1 is not shown.
[0040]
As described above, in the present embodiment, the input of food is detected from the amount of change in the temperature detected by the temperature sensor, and even if a predetermined time has elapsed at the set temperature T1 (for example, 180 degrees) that is optimal for tempura cooking. If the detected temperature of the temperature sensor does not have a temperature change amount equal to or more than a predetermined value, that is, if there is no detection of food input, the current to the heating coil is cut off, which is simpler than in the first embodiment. With this configuration, for example, even when the user forgets to turn off the switch despite the completion of cooking, or when cooking is interrupted for a long time during cooking, as in the first embodiment, there is no waste of power and safety. A heating cooker can be obtained.
[0041]
In the present embodiment, as an example of the heating means, a heating coil that is magnetically coupled and induction-heats a pan by eddy current is described as an example.However, the present invention is not limited to this. For example, a normal electric heater may be used. At this time, the same operation as described above can be performed.
[0042]
Further, in the present embodiment, the temperature of the oil is indirectly detected. However, the present invention is not limited to this. For example, the temperature may be directly detected by attaching a temperature sensor to a pot.
[0043]
Embodiment 5 FIG.
Since the configuration of the heating cooker according to the fifth embodiment is the same as that of FIG. 7 of the fourth embodiment, the configuration diagram and description thereof will be omitted.
[0044]
This embodiment shows another embodiment of the second embodiment.
In the second embodiment, as in the first embodiment, the input of food is detected from the amount of current change to the heating coil 6 obtained from the voltage drop information at the heating coil current detection resistor 7, and is most suitable for tempura cooking. Even if a predetermined time A (for example, 1 minute) elapses at a set temperature T1 (for example, 180 degrees) of the oil, if there is no current change amount equal to or more than a predetermined value, that is, if the input of food is not detected, the oil While gradually lowering the set temperature T1 to T2, T3, and T4, each of them waits for a predetermined time B (for example, 30 seconds). Even if the predetermined time B elapses at the set temperature T4, the input of the food is detected. If not, the control circuit 3 cuts off the current to the heating coil 6.
[0045]
Further, in the second embodiment, for example, during the standby for the predetermined time B at the set temperature T2, when the input of food is detected from the amount of change in current to the heating coil 6, the control circuit 3 The oil setting temperature T2 was returned to the oil setting temperature T1 optimal for the cooking of the tempura, and the current supplied to the heating coil 6 was controlled so as to return to the setting temperature T1 again.
[0046]
In the present embodiment, as in the above-described fourth embodiment, the input of food is detected from the amount of change in the temperature detected by the temperature sensor 8, and the optimal oil setting temperature T1 (for example, 180 ° C.) ), The detected temperature of the temperature sensor 8 does not have a temperature change amount equal to or more than a predetermined value (that is, a predetermined value or more with respect to the above-described set temperature T1) even if a predetermined time A (for example, one minute) elapses. When the input of the food is not detected, the set temperature T1 of the oil is gradually decreased stepwise to T2, T3, and T4, and waits for a predetermined time B (for example, 30 seconds). If the input of food is not detected even after the predetermined time B has elapsed, the control circuit 3 cuts off the current to the heating coil 6. In the same manner, at the set temperatures T2, T3, and T4, when there is a temperature change amount that is equal to or more than a predetermined value with respect to each set temperature, it is detected that the food has been introduced.
[0047]
Further, in the present embodiment, for example, during the standby for the predetermined time B at the set temperature T2, if the detected temperature of the temperature sensor 8 has a temperature change amount equal to or more than a predetermined value, that is, the input of the food is detected. In this case, the control circuit 3 returns the oil setting temperature T2 from the oil setting temperature T2 to the oil setting temperature T1 that is optimal for the cooking of the tempura, and changes the input current to the heating coil 6 so as to return to the setting temperature T1 again. Control operation is performed.
[0048]
As described above, in the present embodiment, the input of food is detected from the amount of temperature change in the temperature detected by the temperature sensor 8, and based on the detected temperature change information of the temperature sensor 8, the predetermined time A and the predetermined time B are used. The difference from the second embodiment is that the standby state is set, and the other control operations of the control circuit 3 are the same as those in the second embodiment.
[0049]
FIG. 9 shows how the current of the heating coil 6, the temperature detected by the temperature sensor 8 and the temperature of the oil according to the present embodiment are changed. FIG. The state of changes in the current of the heating coil 6, the temperature detected by the temperature sensor 8, and the temperature of the oil when the injection is detected is shown.
9 and 10, (a) shows the temperature of the oil, (b) shows the temperature detected by the temperature sensor 8, and (c) shows the current of the heating coil 6, respectively. In the drawing, T1, T2, T3, and T4 indicate the set temperatures of the oil, respectively.
It is to be noted that the change at the time of rising from the start of heating until the oil temperature reaches the target set temperature T1 is not shown.
[0050]
In the present embodiment, when the input of food is detected during the standby of the set temperature T2, the set temperature T2 is returned to the oil set temperature T1 (for example, 180 degrees) which is optimal for the tempura cooking. Although the control operation of the control circuit 3 has been described, the present invention is not limited to this. Similarly, when food is introduced during the standby for a predetermined time at each of the plurality of set temperatures, the tempura is similarly reduced from each set temperature. The control circuit 3 controls the supply current to the heating coil 6 so as to return to the set temperature T1 of the oil which is optimal for cooking and to set the set temperature T1.
[0051]
Further, in the present embodiment, the set temperature of the oil is described as four steps from T1 to T4, but the present invention is not limited to this.
[0052]
As described above, in the present embodiment, the input of food is detected from the amount of change in the temperature detected by the temperature sensor, and the oil is set at a temperature T1 (for example, 180 degrees) optimal for tempura cooking for a predetermined time A (for example, 180 degrees). If the detected temperature of the temperature sensor does not have a temperature change amount equal to or more than a predetermined value even after 1 minute) has elapsed, that is, if there is no detection of food input, the set temperature T1 of the oil is gradually changed to, for example, T2, T3, T4. While waiting for a predetermined time B (for example, 30 seconds), and if the input of food is not detected even after the predetermined time B has elapsed at the set temperature T4, the control circuit 3 The current to the heating coil 6 is cut off. In addition, when, for example, the input of food is detected during the standby for each of the predetermined times B at the set temperatures T2, T3, and T4, the optimum tempura cooking is performed from the set temperatures T2, T3, and T4. Since the oil temperature is returned to the set temperature T1, the configuration is simpler than in the second embodiment. For example, forgetting to turn off the switch or interrupting cooking for a long time during cooking occur even though cooking is completed. Even in a safe and no waste of power. In addition, it is possible to obtain a heating cooker that can quickly cope with cooking at an optimum oil temperature.
[0053]
In the present embodiment, as an example of the heating means, a heating coil that is magnetically coupled and induction-heats a pan by eddy current is described as an example.However, the present invention is not limited to this. For example, a normal electric heater may be used. At this time, the same operation as described above can be performed.
[0054]
Further, in the present embodiment, the temperature of the oil is indirectly detected. However, the present invention is not limited to this. For example, the temperature may be directly detected by attaching a temperature sensor to a pot.
[0055]
Embodiment 6 FIG.
FIG. 11 is a configuration diagram of the heating cooker according to the sixth embodiment.
In FIG. 11, the same or corresponding parts as those in FIG. 1 of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
In FIG. 11, reference numeral 11 denotes, for example, a microphone for detecting a food input sound when the food is input into the oil in the pan 10.
[0056]
In the present embodiment, still another embodiment of the first embodiment is shown.
FIG. 12 is a diagram illustrating a change in operation of the heating coil current, the temperature detected by the temperature sensor, the oil temperature, and the food input sound according to the present embodiment.
12A shows the oil temperature, FIG. 12B shows the temperature detected by the temperature sensor 8, FIG. 12C shows the current of the heating coil 6, and FIG.
[0057]
In the present embodiment, a microphone 11 for detecting the food input sound is added, and the food input sound level detected by the microphone 11 due to the input of the food is, for example, S1 or more as shown in FIG. If there is a change in the heating coil current controlled to the above-mentioned oil set temperature T1 by a predetermined value or more, the control circuit 3 detects that food has been introduced.
[0058]
If the input of the food is not detected even after the predetermined time A (for example, one minute) has elapsed (that is, the food input sound level is equal to or less than S1 and the current change amount is equal to or less than the predetermined value), for example, the user It is determined that the cooker has forgotten to switch off the heating cooker despite the completion of cooking, or that there is a telephone call or the like during cooking and that cooking has been interrupted, Cut off the current to.
[0059]
In the present embodiment, a microphone 11 for detecting the food input sound is added, and the control circuit 3 uses the food input sound level information by the microphone 11 and the current change information of the heating coil current to output the food. This embodiment differs from the first embodiment in that the input is detected, and the other control operations of the control circuit 3 are the same as those in the first embodiment.
[0060]
As described above, in the present embodiment, for example, when the detected temperature of the temperature sensor 8 is reduced due to noise or the like even when no food is put in, the control circuit 3 controls the current to the heating coil 6. Because of the increase, the addition of the microphone 11 for detecting the food input sound makes it possible to more reliably detect the input of the food, and to perform the cooking safely and without wasting power. You can get a bowl.
[0061]
In the present embodiment, as an example of the heating means, a heating coil that is magnetically coupled and induction-heats a pan by eddy current is described as an example.However, the present invention is not limited to this. For example, a normal electric heater may be used. At this time, the same operation as described above can be performed.
[0062]
Further, in the present embodiment, the temperature of the oil is indirectly detected. However, the present invention is not limited to this. For example, the temperature may be directly detected by attaching a temperature sensor to a pot.
[0063]
Further, in the present embodiment, the example has been described in which the current change amount of the heating coil current obtained from the voltage drop information using the heating coil current detection resistor 7 is used. The same control operation can be performed when the detection resistor 17 is used.
[0064]
Further, in the present embodiment, the food input sound level information and the current change amount information of the heating coil current is configured to detect the input of the food, but is not limited thereto, for example, the food The control operation similar to the above may be performed by detecting the input of the food based on the input sound level information and the detected temperature information of the temperature sensor.
[0065]
【The invention's effect】
As described above, the present invention provides a temperature detecting means for detecting a temperature of oil in a cooking vessel, and a power supply to a heater or an induction heating coil so that the temperature of oil in the cooking vessel becomes a predetermined set temperature. Control means for controlling, and current detection means for detecting a current of the heater or the induction heating coil, wherein the control means is detected by the current detection means after the temperature of the oil reaches the set temperature of the tempura cooking. When the amount of change in the electric current is equal to or less than a predetermined value for a predetermined period of time, the power supply to the heater or the induction heating coil is stopped. Even if cooking is interrupted for a long time during cooking, a heating cooker that is safe and does not waste power can be obtained.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a heating cooker according to Embodiment 1 of the present invention.
FIG. 2 is a diagram illustrating a heating coil and a temperature sensor according to the first embodiment;
FIG. 3 is a diagram illustrating a state of an operation change of a heating coil current, a temperature detected by a temperature sensor, and a temperature of oil according to the first embodiment.
FIG. 4 is a diagram showing a state of an operation change of a heating coil current, a temperature detected by a temperature sensor, and a temperature of oil in Embodiment 2 of the present invention.
FIG. 5 is a diagram illustrating a state of an operation change of a heating coil current, a temperature detected by a temperature sensor, and an oil temperature when the input of food according to the second embodiment is detected.
FIG. 6 is a configuration diagram of a heating cooker according to Embodiment 3 of the present invention.
FIG. 7 is a configuration diagram of a heating cooker according to Embodiment 4 of the present invention.
FIG. 8 is a diagram showing a state of an operation change of a heating coil current, a temperature detected by a temperature sensor, and a temperature of oil according to a fourth embodiment.
FIG. 9 is a diagram showing a change in operation of a heating coil current, a temperature detected by a temperature sensor, and an oil temperature according to Embodiment 5 of the present invention.
FIG. 10 is a diagram illustrating a change in operation of a heating coil current, a temperature detected by a temperature sensor, and an oil temperature when the input of food according to the fifth embodiment is detected.
FIG. 11 is a configuration diagram of a heating cooker according to Embodiment 6 of the present invention.
FIG. 12 is a diagram illustrating a change in operation of a heating coil current, a temperature detected by a temperature sensor, an oil temperature, and a food input sound according to Embodiment 6.
FIG. 13 is a diagram showing a state of an operation change of a conventional cooking device.
[Explanation of symbols]
1 AC power supply, 2 switch, 3 control circuit, 4 Tempura mode switch, 5 Output adjustment volume, 6 Heating coil, 7 Heating coil current detection resistor, 8 Temperature sensor, 9 Heat resistant glass, 10 Pot, 11 Microphone, 17 Input current Detection resistor.

Claims

Temperature detection means for detecting the temperature of the oil inside the cooking vessel, control means for controlling power supply to a heater or an induction heating coil so that the temperature of the oil inside the cooking vessel becomes a predetermined set temperature, and the heater or Current detection means for detecting a current of the induction heating coil, wherein the control means is configured to, after the oil temperature reaches a set temperature for cooking the tempura, change the amount of current detected by the current detection means to a predetermined value or less. Wherein the power supply to the heater or the induction heating coil is stopped when the state of (1) has continued for a predetermined time.

Temperature detection means for detecting the temperature of the oil inside the cooking vessel, control means for controlling power supply to a heater or an induction heating coil so that the temperature of the oil inside the cooking vessel becomes a predetermined set temperature, and the heater or Current detection means for detecting a current of the induction heating coil, wherein the control means is configured to, after the oil temperature reaches a set temperature for cooking the tempura, change the amount of current detected by the current detection means to a predetermined value or less. A heating cooker which stops supplying power to the heater or the induction heating coil after a descent period in which the set temperature of the oil is reduced when the state of (1) continues for a predetermined time.

The controller or the induction unit is configured to return the oil temperature to a set temperature for cooking the tempura when the change amount of the current detected by the current detection unit during the descent period is equal to or more than a predetermined value. The heating cooker according to claim 2, wherein power supply to the heating coil is controlled.

3. The heating cooker according to claim 2, wherein the set temperature of the oil is gradually reduced during the descent period.

Temperature detecting means for detecting the temperature of the oil inside the cooking vessel, and control means for controlling power supply to a heater or an induction heating coil so that the temperature of the oil inside the cooking vessel becomes a predetermined set temperature; After the oil temperature reaches the set temperature of the cooking of the tempura, if the amount of change in the oil temperature detected by the temperature detecting means is equal to or less than a predetermined value for a predetermined time, the control means controls the heater or the induction. A heating cooker characterized by stopping power supply to a heating coil.

Temperature detecting means for detecting the temperature of the oil inside the cooking vessel, and control means for controlling power supply to a heater or an induction heating coil so that the temperature of the oil inside the cooking vessel becomes a predetermined set temperature; After the temperature of the oil reaches the set temperature of the cooking of the tempura, if the amount of change in the temperature of the oil detected by the temperature detecting means is equal to or less than a predetermined value for a predetermined period of time, the control means sets the temperature of the oil. A heating cooker, wherein power supply to the heater or the induction heating coil is stopped after a descent period for lowering the temperature.

The controller controls the heater to return the temperature of the oil to a set temperature for cooking the tempura when the amount of change in the temperature of the oil detected by the temperature detector during the descent period is equal to or greater than a predetermined value. 7. The heating cooker according to claim 6, wherein the power supply to the induction heating coil is controlled.

7. The cooking device according to claim 6, wherein the set temperature of the oil is gradually reduced during the descent period.

Temperature detection means for detecting the temperature of the oil inside the cooking vessel, control means for controlling power supply to a heater or an induction heating coil so that the temperature of the oil inside the cooking vessel becomes a predetermined set temperature, and the heater or Current detection means for detecting the current of the induction heating coil, and input sound detection means for detecting the input sound of the food when the food is input into the oil inside the cooking vessel, wherein the control means comprises an oil After the temperature of the food reaches the set temperature for cooking the tempura, the state in which the amount of change in the current detected by the current detecting means is equal to or less than a predetermined value continues for a predetermined time, and A heating cooker characterized in that when a state in which the input sound is lower than a predetermined level continues for a predetermined time, power supply to the heater or the induction heating coil is stopped.