JP2006040779A - Induction heating cooker - Google Patents

Induction heating cooker Download PDF

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JP2006040779A
JP2006040779A JP2004221314A JP2004221314A JP2006040779A JP 2006040779 A JP2006040779 A JP 2006040779A JP 2004221314 A JP2004221314 A JP 2004221314A JP 2004221314 A JP2004221314 A JP 2004221314A JP 2006040779 A JP2006040779 A JP 2006040779A
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input power
water amount
boiling
amount determination
detection means
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JP4285355B2 (en
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Masayo Haji
雅代 土師
Naoaki Ishimaru
直昭 石丸
Masamichi Komada
雅道 駒田
Yoshihiro Yamashita
佳洋 山下
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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    • 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
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating cooker capable of precisely detecting boiling even if an input power changes. <P>SOLUTION: This induction heating cooker is provided with an infrared detection means 5 detecting infrared emitted from a bottom surface of a cooking container 1, a temperatures detection means 6 detecting the temperature of the cooking container 1 from the output of the infrared detection means 5, a water quantity determining means 8 determining the amount of water in the cooking container 1 according to the output of the temperature detection means 6 and a boiling detection means 7 detecting boiling from the output of the temperature detection means 6. The boiling detection means 7 changes a boiling detection condition when the input power changes after determining the boiling detection condition based on the determination of the water quantity determining means 8. Therefore, an optimal boiling detection condition can be determined according to the amount of water when the input power changes after determining the boiling detection condition for precisely detecting boiling. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、入力電力の変化にかかわらず精度良く沸騰検知をすることができる誘導加熱調理器に関するものである。   The present invention relates to an induction heating cooker that can accurately detect boiling regardless of a change in input power.

従来、誘導加熱調理器において、調理容器の温度を検出するためにサーミスタを用いるもの（例えば、特許文献１参照）や、赤外線センサを用いるもの（例えば、特許文献２参照）が知られている。
特開２００３−７４４４号公報 特開平３−１８４２９５号公報 Conventionally, in an induction heating cooker, one using a thermistor to detect the temperature of a cooking container (for example, see Patent Document 1) and one using an infrared sensor (for example, see Patent Document 2) are known.
JP 2003-7444 A Japanese Patent Laid-Open No. 3-184295

しかしながら、前記従来の構成では、いずれも入力電力の変化に対する配慮がなされていない。例えば、誘導加熱調理器の一つの加熱部を使用して湯沸かし調理する場合と全体（複数）の加熱部を使用して湯沸かし調理する場合とでは、同じ加熱部を使用していてもその入力電力が変化するものである。したがって、従来の構成では、いずれも、入力電力の変化があれば、精度良く沸騰検知をすることができないという課題があった。   However, none of the conventional configurations considers the change in input power. For example, when using one heating unit of an induction heating cooker for boiling water cooking and when using the whole (multiple) heating unit for boiling water cooking, even if the same heating unit is used, its input power Is something that changes. Therefore, all the conventional configurations have a problem that boiling cannot be detected accurately if there is a change in input power.

本発明は、前記従来の課題を解決するもので、入力電力が変化した場合にも精度良く沸騰検知をすることができる誘導加熱調理器を提供することを目的とする。   This invention solves the said conventional subject, and it aims at providing the induction heating cooking appliance which can detect a boiling accurately even when input electric power changes.

前記従来の課題を解決するために、本発明の誘導加熱調理器は、調理容器の底面から放射される赤外線を検知する赤外線検出手段と、赤外線検出手段の出力から調理容器の温度を検出する温度検知手段と、温度検知手段の出力より調理容器内の水量を判定する水量判定手段と、温度検知手段の出力より沸騰を検知する沸騰検知手段とを備え、沸騰検知手段は、水量判定手段の判定に基づく沸騰検知条件を決定した後に入力電力が変化した場合、沸騰検知条件を変更するものである。   In order to solve the above-described conventional problems, an induction heating cooker according to the present invention includes an infrared detector that detects infrared rays emitted from the bottom surface of a cooking vessel, and a temperature that detects the temperature of the cooking vessel from the output of the infrared detector. A detection means; a water amount determination means for determining the amount of water in the cooking container from the output of the temperature detection means; and a boiling detection means for detecting boiling from the output of the temperature detection means. The boiling detection means is determined by the water amount determination means. When the input power changes after determining the boiling detection condition based on, the boiling detection condition is changed.

これによって、沸騰検知条件を決定した後に入力電力が変化すれば水量に応じて最適な沸騰検知条件を決定し、精度良く沸騰検知をすることができる。   Thus, if the input power changes after the boiling detection condition is determined, the optimum boiling detection condition can be determined according to the amount of water, and the boiling detection can be performed with high accuracy.

本発明の誘導加熱調理器は、入力電力が変化した場合にも精度良く沸騰検知をすることができる。   The induction cooking device of the present invention can accurately detect boiling even when input power changes.

第１の発明は、調理容器を加熱する加熱コイルと、前記加熱コイルの上部で前記調理容器を保持する天板と、前記天板の下に設置され前記調理容器の底面から放射される赤外線を検知する赤外線検出手段と、前記赤外線検出手段の出力から前記調理容器の温度を検出する温度検知手段と、前記温度検知手段の出力より調理容器内の水量を判定する水量判定手段と、前記温度検知手段の出力より沸騰を検知する沸騰検知手段とを備え、前記沸騰検知手段は、前記水量判定手段の判定に基づく沸騰検知条件を決定した後に入力電力が変化した場合、沸騰検知条件を変更する誘導加熱調理器としたことにより、沸騰検知条件を決定した後に入力電力が変化すれば水量に応じて最適な沸騰検知条件を決定し、精度良く沸騰検知をすることができる。   1st invention is the heating coil which heats a cooking container, the top plate which hold | maintains the said cooking container on the said heating coil, and the infrared rays radiated | emitted from the bottom face of the said cooking container installed under the said top plate Infrared detection means for detecting, temperature detection means for detecting the temperature of the cooking container from the output of the infrared detection means, water amount determination means for determining the amount of water in the cooking container from the output of the temperature detection means, and the temperature detection A boiling detection means for detecting boiling from the output of the means, and the boiling detection means is a guide for changing the boiling detection condition when the input power changes after determining the boiling detection condition based on the determination of the water amount determination means. By using the cooking device, if the input power changes after the boiling detection condition is determined, the optimum boiling detection condition can be determined according to the amount of water, and the boiling can be detected with high accuracy.

第２の発明は、特に、第１の発明において、水量判定手段は、水量判定開始前に入力電力が変化した場合、入力電力の変化に応じた水量判定方法を選択することにより、入力電力に関わらず選択された最適な水量判定方法で水量を判定するため、精度良く沸騰を検知することができる。   In particular, according to a second aspect of the present invention, in the first aspect, when the input power changes before the water amount determination is started, the water amount determination means selects the water amount determination method according to the change in the input power, thereby changing the input power. Regardless, since the water amount is determined by the selected optimal water amount determination method, boiling can be detected with high accuracy.

第３の発明は、特に、第１の発明において、水量判定手段は、水量判定中に入力電力が変化した場合、入力電力の変化に応じた水量判定方法へ変更することにより、入力電力に関わらず変更された最適な水量判定方法で水量を判定するため、精度良く沸騰を検知することができる。   According to a third aspect of the invention, in particular, in the first aspect of the invention, when the input power changes during the water amount determination, the water amount determination means is changed to a water amount determination method according to the change in the input power. Since the water amount is determined by the changed optimal water amount determination method, boiling can be detected with high accuracy.

第４の発明は、特に、第１の発明において、沸騰検知手段は、水量判定手段の判定に基づく沸騰検知条件を決定した後に入力電力が変化した場合、水量判定中の入力電力に応じた沸騰検知条件へ変更することにより、入力電力に関わらず最適な沸騰検知条件を決定するため、精度良く沸騰を検知することができる。   According to a fourth aspect of the present invention, in particular, in the first aspect, when the boiling power detecting means changes the input power after determining the boiling detection condition based on the determination of the water amount determining means, the boiling according to the input power during the water amount determination. By changing to the detection condition, the optimum boiling detection condition is determined regardless of the input power, so that boiling can be detected with high accuracy.

第５の発明は、特に、第１の発明において、沸騰検知手段は、沸騰検知中に入力電力が変化した場合、沸騰検知をリセットすることにより、沸騰検知条件の変化に対応できるため、精度良く沸騰を検知することができる。   The fifth aspect of the invention is particularly accurate in the first aspect of the invention because the boiling detection means can respond to changes in the boiling detection condition by resetting the boiling detection when the input power changes during the boiling detection. Boiling can be detected.

第６の発明は、特に、第２または第３の発明において、水量判定手段は、水量判定中は入力電力が一定となるように制御することにより、入力電力の変化の影響を受けずに水量判定できるため、精度良く沸騰を検知することができる。   In a sixth aspect of the invention, in particular, in the second or third aspect of the invention, the water amount determination means controls the input power to be constant during the water amount determination, so that the amount of water is not affected by changes in the input power. Since it can be determined, boiling can be detected with high accuracy.

第７の発明は、特に、第２、第３、第６のいずれか１つの発明において、水量判定手段は、水量判定開始から所定時間経過後に計測を開始することにより、入力電力の変化の影響を受けずに水量判定できるため、精度良く沸騰を検知することができる。   In particular, according to a seventh aspect of the present invention, in any one of the second, third, and sixth aspects, the water amount determination unit starts measuring after a predetermined time has elapsed from the start of the water amount determination. Since the amount of water can be determined without receiving water, boiling can be detected with high accuracy.

第８の発明は、特に、第１〜第７のいずれか１つの発明において、沸騰検知手段は、入力電力が変化した後は入力電力が所定範囲内に収まるように制御することにより、水量判定を繰り返し実施せずにすむため、確実に沸騰検知を実施することができる。   In an eighth aspect of the invention, in particular, in any one of the first to seventh aspects of the invention, the boiling detection means controls the amount of water by controlling the input power to be within a predetermined range after the input power changes. Therefore, it is possible to reliably perform the boiling detection.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、本実施の形態によって本発明が限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiment.

（実施の形態１）
図１〜図３は、本発明の実施の形態１における誘導加熱調理器を示すものである。 (Embodiment 1)
1 to 3 show an induction heating cooker according to Embodiment 1 of the present invention.

図１に示すように、本実施の形態における誘導加熱調理器は、鍋などの調理容器１を加熱する加熱コイル３と、前記加熱コイル３の上部で前記調理容器１を保持する天板２と、前記加熱コイル３に高周波電流を供給し、調理容器１を誘導加熱で発熱させる高周波インバータ４と、前記天板２の下に設置され前記調理容器１の底面から放射される赤外線を検知する赤外線検出手段５と、前記赤外線検出手段５の出力から前記調理容器１の温度を検出する温度検知手段６と、前記温度検知手段６の出力より調理容器１内の水量を判定する水量判定手段８と、前記加熱コイル３に供給する電力を制御し、温度検知手段６の出力より沸騰を検知する沸騰検知手段７とを備えている。   As shown in FIG. 1, the induction heating cooker in the present embodiment includes a heating coil 3 that heats a cooking container 1 such as a pan, and a top plate 2 that holds the cooking container 1 above the heating coil 3. , A high-frequency inverter 4 for supplying a high-frequency current to the heating coil 3 to heat the cooking vessel 1 by induction heating, and an infrared ray that is installed under the top plate 2 and detects infrared rays emitted from the bottom surface of the cooking vessel 1 A detecting means 5; a temperature detecting means 6 for detecting the temperature of the cooking container 1 from the output of the infrared detecting means 5; and a water amount determining means 8 for determining the amount of water in the cooking container 1 from the output of the temperature detecting means 6. And boil detecting means 7 for controlling the power supplied to the heating coil 3 and detecting the boiling from the output of the temperature detecting means 6.

そして、前記沸騰検知手段７は、前記水量判定手段８の判定に基づく沸騰検知条件を決定した後に入力電力が変化した場合、沸騰検知条件を変更するものである。その後、沸騰検知手段７は、図２に示すように、所定時間Δｔにおける調理容器１の温度差ΔＴ１またはΔＴ２を１秒ごとに算出し、所定温度差ΔＴ以内であることを連続的に検知した場合に調理容器１内の水が沸騰したと判定する構成となっている。   The boiling detection means 7 changes the boiling detection condition when the input power changes after determining the boiling detection condition based on the determination of the water amount determination means 8. Thereafter, as shown in FIG. 2, the boiling detection means 7 calculates the temperature difference ΔT1 or ΔT2 of the cooking container 1 at a predetermined time Δt every second, and continuously detects that it is within the predetermined temperature difference ΔT. In this case, it is determined that the water in the cooking container 1 has boiled.

なお、本実施の形態における誘導加熱調理器は、図示していないが、加熱コイル３からなる単一または複数の加熱部や、他の手段による加熱部などを有しており、単一の加熱部の使用および複数の加熱部の同時使用が必要に応じて適宜できるようになっているものである。   In addition, although the induction heating cooking appliance in this Embodiment is not shown in figure, it has the single or several heating part which consists of the heating coil 3, and the heating part by another means, etc., and single heating The use of the unit and the simultaneous use of the plurality of heating units can be appropriately performed as necessary.

以上のように構成された誘導加熱調理器について、以下その動作、作用を説明する。   About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

まず、図示していない電源を投入し操作スイッチで湯沸かしを開始すると、沸騰検知手段７からの制御により高周波インバータ４から加熱コイル３に電力を供給する。この加熱コイル３に電力が供給されると、加熱コイル３に誘導磁界が発生し、天板２上の調理容器１が加熱される。この誘導加熱によって調理容器１の温度が上昇し、調理容器１内の被加熱物である、例えば、水が沸騰するものである。   First, when a power supply (not shown) is turned on and boiling water is started with an operation switch, electric power is supplied from the high frequency inverter 4 to the heating coil 3 under the control of the boiling detection means 7. When electric power is supplied to the heating coil 3, an induction magnetic field is generated in the heating coil 3, and the cooking container 1 on the top plate 2 is heated. Due to this induction heating, the temperature of the cooking container 1 rises, and water to be heated, for example, water in the cooking container 1 boils.

ここで、調理容器１の温度が上昇すると、その温度に合わせた赤外線が調理容器１から放射される。天板２に使用されるガラスセラミックなどは２．５μｍ以下の波長域の赤外線を効率よく透過できるため、赤外線検知手段５は、例えば、２．５μｍ以下の波長を検出することができるフォトダイオードなどで構成されており、天板２を通ったこの波長域の赤外線が赤外線検知手段５に入射される。また、赤外線検出手段５は、反射率の高い鏡面反射板を用いてより多くの赤外線を集光し、かつ、調理容器１以外からの赤外線を遮断する構成を採っており精度の向上を図っている。   Here, when the temperature of the cooking vessel 1 rises, infrared rays corresponding to the temperature are emitted from the cooking vessel 1. Since the glass ceramic or the like used for the top plate 2 can efficiently transmit infrared rays having a wavelength range of 2.5 μm or less, the infrared detection means 5 is, for example, a photodiode that can detect wavelengths of 2.5 μm or less. The infrared rays in this wavelength range that have passed through the top plate 2 are incident on the infrared detection means 5. Moreover, the infrared detection means 5 employ | adopts the structure which condenses more infrared rays using a highly reflective specular reflector, and cuts off infrared rays from those other than the cooking container 1, and aims at the improvement of precision. Yes.

温度検知手段６は、調理容器１からの赤外線のみが赤外線検出手段５に入射し、その赤外線量にあわせたダイオード電流を、Ｉ−Ｖ変換した上で増幅し、温度に変換する。この温度情報が沸騰検知手段７および水量判定手段８に入力される。水量判定手段８は、温度検知手段６の出力に応じて調理容器１内の水量を判定して、それに基づく沸騰検知条件を決定し、沸騰検知手段７は最適な沸騰検知時の所定時間Δｔおよび所定温度差ΔＴを決定する。そして、沸騰検知手段７は、既述したように、所定時間Δｔでの温度差ΔＴ１またはΔＴ２を１秒ごとに算出し、所定温度差ΔＴ以内であることを連続的に検知した場合に水が沸騰していると判定する。   In the temperature detection means 6, only infrared rays from the cooking container 1 enter the infrared detection means 5, and a diode current corresponding to the amount of infrared rays is subjected to IV conversion, amplified, and converted into temperature. This temperature information is input to the boiling detection means 7 and the water amount determination means 8. The water amount determination means 8 determines the amount of water in the cooking container 1 according to the output of the temperature detection means 6 and determines the boiling detection condition based thereon, and the boiling detection means 7 determines the predetermined time Δt at the time of optimal boiling detection and A predetermined temperature difference ΔT is determined. Then, as described above, the boiling detection means 7 calculates the temperature difference ΔT1 or ΔT2 at a predetermined time Δt every second, and water is detected when it is continuously detected that it is within the predetermined temperature difference ΔT. Judge that it is boiling.

ここで、例えば、単一に加熱部の使用から全体（複数）の加熱部の同時使用に切り替えた場合、使用中である加熱部の入力電力は、図２に波線で示すように小さくなり、入力電力が一定の場合に比べて温度変化が小さく温度差ΔＴ１からΔＴ２となるため、水量判定手段８の結果を受けて決定された所定時間Δｔおよび所定温度差ΔＴでは水が沸騰していないにもかかわらずに、沸騰していると判定する可能性が生じる。そこで、水量判定手段８の判定に基づく沸騰検知条件を決定した後に入力電力が変化した場合、沸騰検知条件を変更することによって、入力電力が変化した場合でも水が沸騰していると判定するようにしている。   Here, for example, when switching from the use of the heating unit to the simultaneous use of the entire (plurality) of heating units, the input power of the heating unit being used becomes small as shown by the wavy line in FIG. Since the temperature change is small compared with the case where the input power is constant, the temperature difference ΔT1 to ΔT2, so that the water does not boil at the predetermined time Δt and the predetermined temperature difference ΔT determined based on the result of the water amount determination means 8. Nevertheless, there is a possibility that it is determined to be boiling. Therefore, when the input power changes after determining the boiling detection condition based on the determination of the water amount determination means 8, the boiling detection condition is changed to determine that the water is boiling even when the input power changes. I have to.

以下、図３を用いて沸騰検知手段７における沸騰検知判定方法のアルゴリズムの一例を説明する。   Hereinafter, an example of the algorithm of the boiling detection determination method in the boiling detection means 7 will be described with reference to FIG.

ステップ（以下、Ｓと表示する）１において、入力電力が変化していなければＳ２へ進み、変化していればＳ５へ進む。Ｓ２において、所定時間Δｔでの温度差ΔＴ１が所定温度差ΔＴ以内であればＳ３へ進み、所定温度差ΔＴ以内でなければＳ１に戻る。Ｓ３において、検知回数ｎをカウントする。Ｓ４において、検知回数ｎが所定回数Ｎ以上であれば加熱を終了し、所定回数Ｎ未満であればＳ１に戻る。Ｓ５においては、水量に応じて最適な沸騰検知条件に変更する。そして、Ｓ６において、検知回数ｎをリセットしてＳ１に戻る。   In step (hereinafter referred to as S) 1, if the input power has not changed, the process proceeds to S2, and if it has changed, the process proceeds to S5. In S2, if the temperature difference ΔT1 at the predetermined time Δt is within the predetermined temperature difference ΔT, the process proceeds to S3, and if not within the predetermined temperature difference ΔT, the process returns to S1. In S3, the number of detections n is counted. In S4, if the number of detections n is equal to or greater than the predetermined number N, the heating is terminated. In S5, it changes to the optimal boiling detection conditions according to the amount of water. In S6, the number of detections n is reset and the process returns to S1.

なお、沸騰検知に用いられる所定時間Δｔおよび所定温度差ΔＴは予め最適な値を実験的に決定するものである。   Note that the predetermined time Δt and the predetermined temperature difference ΔT used for boiling detection are experimentally determined in advance as optimum values.

以上のように、本実施の形態では、沸騰検知条件を決定した後に入力電力が変化すれば水量に応じて最適な沸騰検知条件を決定し、精度良く沸騰検知をすることができる。また、上記説明では沸騰検知時の入力電力が変化したかどうかで沸騰検知条件を変更しているが、水量判定中の入力電力に応じて、複数の沸騰検知条件へ変更すれば、沸騰検知の精度を向上させることができる。なお、沸騰検知手段７は、沸騰検知中に入力電力が変化した場合、沸騰検知をリセットすることにより、沸騰検知条件の変化に対応できるため、精度良く沸騰を検知することができるものである。   As described above, in the present embodiment, if the input power changes after the boiling detection condition is determined, the optimum boiling detection condition can be determined according to the amount of water, and the boiling can be detected with high accuracy. In the above description, the boiling detection condition is changed depending on whether or not the input power at the time of boiling detection has changed, but if the change is made to a plurality of boiling detection conditions according to the input power during water volume determination, the boiling detection condition is changed. Accuracy can be improved. In addition, when the input electric power changes during boiling detection, the boiling detection means 7 can detect the boiling with high accuracy because it can cope with the change in the boiling detection condition by resetting the boiling detection.

（実施の形態２）
図４、図５は、本発明の実施の形態２における誘導加熱調理器を示すものである。実施の形態１と基本構成は同じであるので、相違点を中心に説明する。 (Embodiment 2)
4 and 5 show an induction heating cooker according to Embodiment 2 of the present invention. Since the basic configuration is the same as that of the first embodiment, differences will be mainly described.

本実施の形態において、水量判定手段８は、水量判定開始前に入力電力が変化した場合、入力電力の変化に応じた水量判定方法を選択するようにしたものである。   In the present embodiment, the water amount determination means 8 selects a water amount determination method according to the change in the input power when the input power changes before the water amount determination is started.

図４は、温度判定値Ｔ１からＴ２までの到達時間によって調理容器１内の水量を判定する水量判定方法において、入力電力が一定の場合と、水量判定開始前に入力電力が小さくなった場合の温度変化をグラフに表したものである。入力電力が一定の時の到達時間をｔ１、入力電力が小さくなった時の到達時間をｔ２とすると、入力電力が小さくなった場合には温度変化が小さくなるため、同じ水量であっても到達時間が長くなり、ｔ１＜ｔ２のような関係が成立する。この関係は特に水量が多い場合に顕著になるため、水量が多い場合の沸騰検知の精度が悪くなるおそれがある。これを解消するために、入力電力が変化した場合には、第２の水量判定方法を選択するものである。   FIG. 4 shows a case where the input power is constant and the input power is reduced before the water amount determination is started in the water amount determination method for determining the amount of water in the cooking container 1 based on the arrival time from the temperature determination values T1 to T2. It shows the temperature change in a graph. Assuming that the arrival time when the input power is constant is t1, and the arrival time when the input power is small, t2, the temperature change is small when the input power is small. As time increases, a relationship such as t1 <t2 is established. Since this relationship becomes prominent particularly when the amount of water is large, the accuracy of boiling detection when the amount of water is large may be deteriorated. In order to eliminate this, when the input power changes, the second water amount determination method is selected.

図５を用いて水量判定方法のアルゴリズムの一例を説明する。   An example of the algorithm of the water amount determination method will be described with reference to FIG.

Ｓ１１において、入力電力が変化したことがあるかどうかを判定し、変化したことがなければＳ１２へ進み、変化したことがあればＳ１３へ進む。Ｓ１２において、第１の水量判定方法を用いて温度検知手段６の出力に応じて調理容器１内の水量を判定する。Ｓ１３において、第２の水量判定方法を用いて温度検知手段６の出力に応じて調理容器１内の水量を判定する。   In S11, it is determined whether or not the input power has changed, and if not changed, the process proceeds to S12, and if changed, the process proceeds to S13. In S12, the amount of water in the cooking container 1 is determined according to the output of the temperature detection means 6 using the first water amount determination method. In S13, the amount of water in the cooking container 1 is determined according to the output of the temperature detection means 6 using the second water amount determination method.

なお、入力電力が変化したかどうかで水量判定方法を変更しているが、入力電力の変化度合いに応じて複数の水量判定方法より選択すれば、水量判定の精度を向上させることができる。   Although the water amount determination method is changed depending on whether the input power has changed, the accuracy of water amount determination can be improved by selecting from a plurality of water amount determination methods according to the degree of change in the input power.

また、第２の水量判定方法を用いて水量判定を実施する場合、入力電力が一定になるように制御すれば、入力電力の変化の影響を受けずに水量判定を実施することができるため、水量判定の精度を向上することができる。   In addition, when performing the water volume determination using the second water volume determination method, if the input power is controlled to be constant, the water volume determination can be performed without being affected by the change in the input power. The accuracy of water volume determination can be improved.

さらに、第２の水量判定方法を用いて水量判定を実施する場合、水量判定開始から所定時間経過後に計測を開始すれば、入力電力の変化の影響を受けずに水量判定を実施することができるため、水量判定の精度を向上することができる。   Furthermore, when performing the water amount determination using the second water amount determination method, the water amount determination can be performed without being affected by the change in the input power if the measurement is started after a predetermined time has elapsed from the start of the water amount determination. Therefore, the accuracy of water volume determination can be improved.

以上のように、本実施の形態では、水量判定手段８は、水量判定開始前に入力電力が変化した場合、入力電力の変化に応じた水量判定方法を選択することにより、入力電力に関わらず選択された最適な水量判定方法で精度良く水量を判定するため、精度良く沸騰を検知することができる。   As described above, in the present embodiment, when the input power changes before the water amount determination starts, the water amount determination unit 8 selects the water amount determination method according to the change in the input power, regardless of the input power. Since the water amount is accurately determined by the selected optimum water amount determination method, boiling can be detected with high accuracy.

（実施の形態３）
図６、図７は、本発明の実施の形態３における誘導加熱調理器を示すものである。実施の形態１と基本構成は同じであるので、相違点を中心に説明する。 (Embodiment 3)
6 and 7 show an induction heating cooker according to Embodiment 3 of the present invention. Since the basic configuration is the same as that of the first embodiment, differences will be mainly described.

本実施の形態において、水量判定手段８は、水量判定中に入力電力が変化した場合、入力電力の変化に応じた水量判定方法へ変更するようにしたものである。   In the present embodiment, when the input power changes during the water amount determination, the water amount determination means 8 is changed to a water amount determination method according to the change in the input power.

図６は、温度判定値Ｔ１からＴ２までの到達時間によって調理容器１内の水量を判定する水量判定方法において、入力電力が一定の場合と水量判定中に入力電力が小さくなった場合の温度変化をグラフに表したものである。入力電力が一定の時の到達時間をｔ３、入力電力が小さくなった時の到達時間をｔ４とすると、入力電力が小さくなった場合には温度変化が小さくなるため、同じ水量であっても到達時間が長くなり、ｔ３＜ｔ４のような関係が成立する。その結果、最適な沸騰検知条件を選択できない可能性があるため、沸騰検知の精度が悪くなるおそれがある。これを解消するために、入力電力が変化した場合には第２の水量判定方法を選択するものである。   FIG. 6 shows a change in temperature when the input power is constant and when the input power is reduced during the water amount determination in the water amount determination method for determining the amount of water in the cooking container 1 based on the arrival time from the temperature determination value T1 to T2. Is represented in a graph. Assuming that the arrival time when the input power is constant is t3 and the arrival time when the input power is small is t4, the temperature change is small when the input power is small. As time increases, a relationship such as t3 <t4 is established. As a result, there is a possibility that the optimum boiling detection condition cannot be selected, so that the accuracy of boiling detection may be deteriorated. In order to eliminate this, when the input power changes, the second water amount determination method is selected.

図７を用いて水量判定方法のアルゴリズムの一例を説明する。   An example of the algorithm of the water amount determination method will be described with reference to FIG.

Ｓ２１において、温度検知手段６で算出した温度Ｔが温度判定値Ｔ１以上であればＳ２２へ進み、温度判定値Ｔ１未満であればＳ２１に戻る。Ｓ２２において、タイマーが時間計測ｔｔを開始する。Ｓ２３において、入力電力が変化したことがあるかどうかを判定し、変化したことがあればＳ２４へ進み、変化したことがなければＳ２５へ進む。Ｓ２４において、第２の水量判定方法を用いて温度検知手段６の出力に応じて調理容器１内の水量を判定する。Ｓ２５において、温度検知手段６で算出した温度Ｔが温度判定値Ｔ２以上であればＳ２６へ進み、温度判定値Ｔ２未満であればＳ２３に戻る。Ｓ２６において、タイマーを停止し、計測時間ｔｔを得る。Ｓ２７において、計測時間ｔｔより調理容器１内の水量を判定する。   In S21, if the temperature T calculated by the temperature detection means 6 is equal to or higher than the temperature determination value T1, the process proceeds to S22, and if it is less than the temperature determination value T1, the process returns to S21. In S22, the timer starts time measurement tt. In S23, it is determined whether or not the input power has changed, and if it has changed, the process proceeds to S24, and if it has not changed, the process proceeds to S25. In S24, the amount of water in the cooking container 1 is determined according to the output of the temperature detection means 6 using the second water amount determination method. In S25, if the temperature T calculated by the temperature detection means 6 is not less than the temperature determination value T2, the process proceeds to S26, and if it is less than the temperature determination value T2, the process returns to S23. In S26, the timer is stopped and the measurement time tt is obtained. In S27, the amount of water in the cooking container 1 is determined from the measurement time tt.

なお、入力電力が変化したかどうかで水量判定方法を変更しているが、入力電力の変化度合いに応じて複数の水量判定方法より選択すれば、水量判定の精度を向上させることができる。   Although the water amount determination method is changed depending on whether the input power has changed, the accuracy of water amount determination can be improved by selecting from a plurality of water amount determination methods according to the degree of change in the input power.

また、第２の水量判定方法を用いて水量判定を実施する場合、入力電力が一定になるように制御すれば、入力電力の変化の影響を受けずに水量判定を実施することができるため、水量判定の精度を向上することができる。   In addition, when performing the water volume determination using the second water volume determination method, if the input power is controlled to be constant, the water volume determination can be performed without being affected by the change in the input power. The accuracy of water volume determination can be improved.

さらに、第２の水量判定方法を用いて水量判定を実施する場合、水量判定開始から所定時間経過後に計測を開始すれば、入力電力の変化の影響を受けずに水量判定を実施することができるため、水量判定の精度を向上することができる。   Furthermore, when performing the water amount determination using the second water amount determination method, the water amount determination can be performed without being affected by the change in the input power if the measurement is started after a predetermined time has elapsed from the start of the water amount determination. Therefore, the accuracy of water volume determination can be improved.

以上のように、本実施の形態では、水量判定手段８は、水量判定中に入力電力が変化した場合、入力電力の変化に応じた水量判定方法へ変更することにより、入力電力に関わらず変更された最適な水量判定方法で精度良く水量を判定するため、精度良く沸騰を検知することができる。   As described above, in the present embodiment, when the input power changes during the water amount determination, the water amount determination unit 8 changes the input amount regardless of the input power by changing to the water amount determination method according to the change in the input power. Since the water amount is accurately determined by the optimum water amount determination method, boiling can be detected with high accuracy.

（実施の形態４）
次に、本発明の実施の形態４における誘導加熱調理器について説明する。 (Embodiment 4)
Next, the induction heating cooker in Embodiment 4 of this invention is demonstrated.

本実施の形態において、沸騰検知手段７は、入力電力が変化した後は入力電力が所定範囲内に収まるように制御するようにしたものである。これ以外は実施の形態１と同様である。   In the present embodiment, the boiling detection means 7 controls the input power so that it falls within a predetermined range after the input power changes. The rest is the same as in the first embodiment.

以上のように、本実施の形態では、沸騰検知手段７は、入力電力が変化した後は入力電力が所定範囲内に収まるように制御するようにしたことにより、水量判定を繰り返し実施せずにすむため、確実に沸騰検知を実施することができる。   As described above, in the present embodiment, the boiling detection means 7 performs control so that the input power is within the predetermined range after the input power is changed, so that the water amount determination is not repeatedly performed. Therefore, it is possible to reliably perform boiling detection.

以上のように、本発明にかかる誘導加熱調理器は、入力電力が変化した場合にも精度良く沸騰検知をすることができるので、家庭用あるいは業務用など様々な誘導加熱調理器にも適用できる。   As described above, the induction heating cooker according to the present invention can accurately detect boiling even when the input power changes, and thus can be applied to various induction heating cookers such as home use and business use. .

本発明の実施の形態１における誘導加熱調理器の構成を示すブロック図The block diagram which shows the structure of the induction heating cooking appliance in Embodiment 1 of this invention. 同誘導加熱調理器における入力電力が変化した場合の温度変化の違いを示すグラフThe graph which shows the difference of the temperature change when the input electric power changes in the same induction heating cooker 同誘導加熱調理器における沸騰検知手段での処理内容を示すフローチャートThe flowchart which shows the processing content in the boiling detection means in the induction heating cooking appliance 本発明の実施の形態２における誘導加熱調理器の入力電力が変化した場合の温度変化の違いを示すグラフThe graph which shows the difference in the temperature change when the input electric power of the induction heating cooking appliance in Embodiment 2 of this invention changes. 同誘導加熱調理器における水量判定手段での処理内容を示すフローチャートThe flowchart which shows the processing content in the water quantity determination means in the induction heating cooking appliance 本発明の実施の形態３における誘導加熱調理器の入力電力が変化した場合の温度変化の違いを示すグラフThe graph which shows the difference in the temperature change when the input electric power of the induction heating cooking appliance in Embodiment 3 of this invention changes. 同誘導加熱調理器における水量判定手段での処理内容を示すフローチャートThe flowchart which shows the processing content in the water quantity determination means in the induction heating cooking appliance

符号の説明Explanation of symbols

１ 調理容器
２ 天板
３ 加熱コイル
４ 高周波インバータ
５ 赤外線検出手段
６ 温度検知手段
７ 沸騰検知手段
８ 水量判定手段 DESCRIPTION OF SYMBOLS 1 Cooking container 2 Top plate 3 Heating coil 4 High frequency inverter 5 Infrared detection means 6 Temperature detection means 7 Boiling detection means 8 Water quantity determination means

Claims (8)

調理容器を加熱する加熱コイルと、前記加熱コイルの上部で前記調理容器を保持する天板と、前記天板の下に設置され前記調理容器の底面から放射される赤外線を検知する赤外線検出手段と、前記赤外線検出手段の出力から前記調理容器の温度を検出する温度検知手段と、前記温度検知手段の出力より調理容器内の水量を判定する水量判定手段と、前記温度検知手段の出力より沸騰を検知する沸騰検知手段とを備え、前記沸騰検知手段は、前記水量判定手段の判定に基づく沸騰検知条件を決定した後に入力電力が変化した場合、沸騰検知条件を変更する誘導加熱調理器。 A heating coil for heating the cooking container; a top plate for holding the cooking container at an upper portion of the heating coil; and an infrared detection means for detecting infrared rays radiated from the bottom surface of the cooking container installed under the top plate. The temperature detection means for detecting the temperature of the cooking container from the output of the infrared detection means, the water amount determination means for determining the amount of water in the cooking container from the output of the temperature detection means, and the boiling from the output of the temperature detection means A boiling detection means for detecting, the boiling detection means changing the boiling detection condition when the input power changes after determining the boiling detection condition based on the determination of the water amount determination means. 水量判定手段は、水量判定開始前に入力電力が変化した場合、入力電力の変化に応じた水量判定方法を選択する請求項１に記載の誘導加熱調理器。 The induction heating cooker according to claim 1, wherein the water amount determination means selects a water amount determination method in accordance with a change in the input power when the input power changes before the water amount determination is started. 水量判定手段は、水量判定中に入力電力が変化した場合、入力電力の変化に応じた水量判定方法へ変更する請求項１に記載の誘導加熱調理器。 The induction heating cooker according to claim 1, wherein the water amount determination means changes to a water amount determination method according to a change in the input power when the input power changes during the water amount determination. 沸騰検知手段は、水量判定手段の判定に基づく沸騰検知条件を決定した後に入力電力が変化した場合、水量判定中の入力電力に応じた沸騰検知条件へ変更する請求項１に記載の誘導加熱調理器。 2. The induction heating cooking according to claim 1, wherein when the input power changes after the boiling detection condition based on the determination of the water amount determination means is determined, the boiling detection means changes to the boiling detection condition according to the input power during the water amount determination. vessel. 沸騰検知手段は、沸騰検知中に入力電力が変化した場合、沸騰検知をリセットする請求項１に記載の誘導加熱調理器。 The induction heating cooker according to claim 1, wherein the boiling detection means resets the boiling detection when the input power changes during the boiling detection. 水量判定手段は、水量判定中は入力電力が一定となるように制御する請求項２または３に記載の誘導加熱調理器。 The induction heating cooker according to claim 2 or 3, wherein the water amount determining means controls the input power to be constant during the water amount determination. 水量判定手段は、水量判定開始から所定時間経過後に計測を開始する請求項２、３、６のいずれか１項に記載の誘導加熱調理器。 The induction heating cooker according to any one of claims 2, 3, and 6, wherein the water amount determination means starts measurement after a predetermined time has elapsed from the start of water amount determination. 沸騰検知手段は、入力電力が変化した後は入力電力が所定範囲内に収まるように制御する請求項１〜７のいずれか１項に記載の誘導加熱調理器。 The induction heating cooker according to any one of claims 1 to 7, wherein the boiling detection means controls the input power to fall within a predetermined range after the input power changes.
JP2004221314A 2004-07-29 2004-07-29 Induction heating cooker Expired - Fee Related JP4285355B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113390106A (en) * 2020-03-12 2021-09-14 广东美的白色家电技术创新中心有限公司 Control method, cooking utensil and storage medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113390106A (en) * 2020-03-12 2021-09-14 广东美的白色家电技术创新中心有限公司 Control method, cooking utensil and storage medium
CN113390106B (en) * 2020-03-12 2024-04-05 广东美的白色家电技术创新中心有限公司 Control method, cooking appliance and storage medium

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