JP5747178B2 - Induction heating cooker and its program - Google Patents

Induction heating cooker and its program Download PDF

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JP5747178B2
JP5747178B2 JP2011550854A JP2011550854A JP5747178B2 JP 5747178 B2 JP5747178 B2 JP 5747178B2 JP 2011550854 A JP2011550854 A JP 2011550854A JP 2011550854 A JP2011550854 A JP 2011550854A JP 5747178 B2 JP5747178 B2 JP 5747178B2
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temperature
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cooking container
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infrared sensor
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JPWO2011089901A1 (en
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渡辺 賢治
賢治 渡辺
富永 博
博 富永
緒方 大象
大象 緒方
野口 新太郎
新太郎 野口
卓也 橋本
卓也 橋本
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Panasonic Intellectual Property Management Co Ltd
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/02Induction heating
    • H05B6/06Control, e.g. of temperature, of power
    • H05B6/062Control, e.g. of temperature, of power for cooking plates or the like
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07Heating plates with temperature control means

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  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)

Description

本発明は、調理容器を誘導加熱する誘導加熱調理器およびそのプログラムに関する。   The present invention relates to an induction heating cooker for induction heating a cooking vessel and a program thereof.

近年、鍋やフライパンなどの調理容器を、加熱コイルにより誘導加熱する誘導加熱調理器が、一般家庭や業務用のキッチンなどで広く用いられている。   In recent years, induction heating cookers that induction-heat cooking containers such as pans and frying pans with a heating coil have been widely used in general households and commercial kitchens.

図8は、特許文献1に記載された従来技術に係る誘導加熱調理器を示す。図8に示すように、本体内部に設けた誘導加熱コイル12および赤外線センサ13と、赤外線を透過する材質で一部または全体が構威された調理容器載置面14とを有し、前記赤外線センサ13は、調理容器載置面14に置かれた調理容器15から発せられた赤外線を受けることにより調理容器15の温度を検知し、赤外線センサ13の出力を加熱制御系の帰還ループに取り込み、加熱制御を行う。   FIG. 8 shows an induction heating cooker according to the prior art described in Patent Document 1. As shown in FIG. 8, it has an induction heating coil 12 and an infrared sensor 13 provided inside the main body, and a cooking vessel mounting surface 14 partially or entirely composed of a material that transmits infrared rays, The sensor 13 detects the temperature of the cooking vessel 15 by receiving infrared rays emitted from the cooking vessel 15 placed on the cooking vessel placement surface 14, and takes the output of the infrared sensor 13 into the feedback loop of the heating control system, Control heating.

また、調理容器15の載置位置が不適切な場合は、経過時間と温度情報の割合を見て赤外線センサ13の検知温度の上昇率が少ない場合は、載置位置が不適正であるとして、警報部に信号を送り使用者に注意を促している。   In addition, when the placement position of the cooking container 15 is inappropriate, when the rate of increase in the detected temperature of the infrared sensor 13 is small by looking at the ratio of elapsed time and temperature information, the placement position is inappropriate. A signal is sent to the alarm unit to alert the user.

特開平3−184295号公報Japanese Patent Laid-Open No. 3-184295

前記従来技術に係る構成では、経過時間と温度情報の割合を見て赤外線センサ13の検知温度の上昇率が少ない場合は、載置位置が不適正であるとしている。しかしながら、経過時間に対する赤外線センサ13の検知温度の上昇値に対しては、調理容器15及び調理容器15内の被調理物の熱容量の影響が大きい。調理容器の質量が大きい場合や調理容器15に入れられる油の量が多量の場合にも経過時間に対する調理容器の温度上昇は小さくなり、載置位置が不適切と誤検知するという課題を有していた。   In the configuration according to the prior art, when the rate of increase in the detected temperature of the infrared sensor 13 is small in view of the ratio between the elapsed time and the temperature information, the mounting position is inappropriate. However, the influence of the heat capacity of the cooking container 15 and the cooking object in the cooking container 15 is large on the increase value of the detected temperature of the infrared sensor 13 with respect to the elapsed time. Even when the mass of the cooking container is large or when the amount of oil put into the cooking container 15 is large, the temperature rise of the cooking container with respect to the elapsed time is small, and there is a problem of erroneously detecting that the placement position is inappropriate. It was.

本発明の目的は、前記従来技術の問題を解決し、調理容器の質量が大きい場合や調理容器に入れられる油の量が多量の場合にも誤検知することなく、載置位置が不適正かを判断可能な安全に使用できる誘導加熱調理器およびそのプログラムを提供することにある。   The object of the present invention is to solve the problems of the prior art, and whether the placement position is inappropriate without erroneous detection even when the mass of the cooking container is large or the amount of oil put into the cooking container is large. It is to provide an induction heating cooker that can be used safely and a program thereof.

本発明に係る誘導加熱調理器は、赤外線が透過する材料で形成されたトッププレートと、高周波電流が供給されることによって、前記トッププレート上に載置された調理容器を誘導加熱する加熱コイルと、前記加熱コイルに前記高周波電流を供給するインバータ回路と、前記調理容器の底面から放射され、前記トッププレートを透過した赤外線を検出して前記底面温度に応じた検出信号を増幅器により増幅して出力する赤外線センサと、前記赤外線センサの出力から前記底面温度を算出する底面温度算出部と、前記底面温度算出部の出力に基づいて、前記インバータ回路の加熱出力を制御する加熱制御部とを備え、前記赤外線センサは、前記調理容器の底面温度の増加に対し、前記赤外線センサの出力の増加率が所定の温度未満では略ゼロで、前記所定の温度以上のときにべき乗関数的に増加するように、増幅器の増幅率が設定され、前記加熱制御部は加熱開始時に前記底面温度算出部の算出温度が前記所定温度以上であり、かつ加熱開始から所定時間経過するまでの前記算出温度の温度上昇が所定のしきい値未満のときに前記加熱出力の抑制あるいは前記インバータ回路の加熱動作の停止を行い、前記所定のしきい値は前記調理容器の質量が大きい場合又は前記調理容器に入れられる油の量が多量の場合であり、かつ前記調理容器が適切に載置されたときの加熱開始から前記所定時間経過するまでの前記算出温度の温度上昇より小さくなるように設定されることを特徴とする。 An induction heating cooker according to the present invention includes a top plate formed of a material that transmits infrared rays, and a heating coil that induction-heats a cooking vessel placed on the top plate by being supplied with a high-frequency current. , An inverter circuit for supplying the high-frequency current to the heating coil, and infrared rays radiated from the bottom surface of the cooking vessel and transmitted through the top plate, and a detection signal corresponding to the bottom surface temperature is amplified and output by an amplifier an infrared sensor for a bottom temperature calculation section for calculating the bottom temperature from an output of the infrared sensor, based on an output of the bottom temperature calculation unit, e Bei a heating control section for controlling the heating output of the inverter circuit the infrared sensor is to increase the bottom temperature of the cooking vessel, the rate of increase in the output of the infrared sensor at a substantially zero is less than a predetermined temperature The amplification factor of the amplifier is set so as to increase in a power function when the temperature is equal to or higher than the predetermined temperature, and the heating control unit has a calculated temperature of the bottom surface temperature calculating unit at the start of heating that is equal to or higher than the predetermined temperature, and There line to stop the heating operation of suppressing or the inverter circuit of the heating output when less than the predetermined threshold temperature increase of the calculated temperature from the start of heating until a predetermined time elapses, the predetermined threshold value The calculation from the start of heating when the mass of the cooking container is large or when the amount of oil put into the cooking container is large and when the cooking container is properly placed until the predetermined time elapses The temperature is set to be smaller than the temperature rise .

また、本発明に係る誘導加熱調理器のためのプログラムは、赤外線が透過する材料で形成されたトッププレートと、高周波電流が供給されることによって、前記トッププレート上に載置された調理容器を誘導加熱する加熱コイルと、前記加熱コイルに前記高周波電流を供給するインバータ回路と、前記調理容器の底面から放射され、前記トッププレートを透過した赤外線を検出して前記底面温度に応じた検出信号を増幅器により増幅して出力する赤外線センサと、前記赤外線センサの出力から前記底面温度を算出する底面温度算出部と、前記底面温度算出部の出力に基づいて、前記インバータ回路の加熱出力を制御する加熱制御部とを備え、
前記赤外線センサは、前記調理容器の底面温度の増加に対し、前記赤外線センサの出力の増加率が所定の温度未満では略ゼロで、前記所定の温度以上のときにべき乗関数的に増加するように、前記増幅器の増幅率が設定され、
前記加熱制御部は、加熱開始時に前記底面温度算出部の算出温度が前記所定温度以上であり、かつ加熱開始から所定時間経過するまでの前記算出温度の温度上昇が所定のしきい値未満のときに前記加熱出力の抑制あるいは前記インバータ回路の加熱動作の停止を行い、前記所定のしきい値は前記調理容器の質量が大きい場合又は前記調理容器に入れられる油の量が多量の場合であり、かつ前記調理容器が適切に載置されたときの加熱開始から所定時間経過するまでの前記算出温度の温度上昇より小さくなるように設定されるステップを含むことを特徴とする。
In addition, a program for an induction heating cooker according to the present invention includes a top plate formed of a material that transmits infrared rays, and a cooking container placed on the top plate by being supplied with a high-frequency current. A heating coil for induction heating, an inverter circuit for supplying the high-frequency current to the heating coil, and an infrared ray radiated from the bottom surface of the cooking vessel and transmitted through the top plate to detect a detection signal corresponding to the bottom surface temperature An infrared sensor that amplifies and outputs by an amplifier, a bottom surface temperature calculation unit that calculates the bottom surface temperature from the output of the infrared sensor, and heating that controls the heating output of the inverter circuit based on the output of the bottom surface temperature calculation unit for example Bei and a control unit,
The infrared sensor is configured such that the increase rate of the output of the infrared sensor is substantially zero when the temperature is lower than a predetermined temperature and increases as a power function when the temperature is equal to or higher than the predetermined temperature with respect to an increase in the bottom temperature of the cooking container. , The amplification factor of the amplifier is set,
The heating control unit is configured such that at the start of heating, the calculated temperature of the bottom surface temperature calculating unit is equal to or higher than the predetermined temperature, and the temperature increase of the calculated temperature from the start of heating until a predetermined time elapses is less than a predetermined threshold value. the have a row to stop the heating operation of suppressing or the inverter circuit of the heating power, the predetermined threshold amount of oil placed in the case or the cooking vessel mass of the cooking container is large the case when a large amount in And a step that is set to be smaller than a temperature increase of the calculated temperature from the start of heating when the cooking container is properly placed until a predetermined time elapses .

これによって、調理容器位置が不適切で赤外線センサの上に載置されていない状態で加熱を開始された場合に、部屋の照明や窓から入射する赤外線を含んだ太陽光などがトッププレートを透過して赤外線センサに到達し、あたかも底面温度が所定温度を超えたかのように赤外線センサが検出信号を出力して、底面温度算出部の算出温度は所定温度以上になったり、あるいは、調理容器の質量が大きい場合や調理容器に入れられる食材や油の量が多量で加熱経過時間に対する温度上昇が小さくなったりする場合でも加熱開始時の底面温度算出部の算出温度が所定温度以上であるときにのみ、加熱開始から所定時間経過するまでの算出温度の温度上昇が所定のしきい値未満であるかを判断して、調理容器の載置位置が不適切かを判定するため、精度よく載置位置が不適正かを判断することができ、調理容器が不適切に載置されて加熱される機会を減らし安全性を高め、使い勝手を良くすることができる。   As a result, when heating is started with the cooking container position being inappropriate and not being placed on the infrared sensor, sunlight including infrared rays entering the room or windows is transmitted through the top plate. The infrared sensor outputs a detection signal as if the bottom surface temperature exceeded the predetermined temperature, and the calculated temperature of the bottom surface temperature calculation unit exceeds the predetermined temperature or the mass of the cooking container Only when the calculated temperature of the bottom surface temperature calculation unit at the start of heating is equal to or higher than the predetermined temperature even when the amount of food and oil put into the cooking container is large and the temperature rise with respect to the elapsed heating time is small In order to determine whether the temperature rise of the calculated temperature from the start of heating until the elapse of a predetermined time is less than a predetermined threshold value, it is determined whether the placement position of the cooking container is inappropriate. Well placed position can determine improper, cooking vessel improve safety reduces the chances that is heated improperly placed, it is possible to improve the usability.

本発明の誘導加熱調理器によれば、加熱開始時の底面温度算出部の算出結果が調理容器の質量が大きい場合又は調理容器に入れられる油の量が多量の場合であり、かつ調理容器が適切に載置されたときの加熱開始から所定時間経過するまでの算出温度の温度上昇より小さくなるように設定される所定温度以上のときにのみ、加熱開始から所定時間経過するまでの算出温度の温度上昇が所定のしきい値未満であるかを判断して、調理容器の載置位置が不適切かを判定するため、調理容器の質量が大きい場合や調理容器に入れられる食材や油の量が多量の場合にも精度よく載置位置が不適正かを判断可能で、調理容器が不適切に載置されて加熱される機会を減らし安全性を高め、使い勝手を良くすることができる。 According to the induction heating cooker of the present invention, the calculation result of the bottom surface temperature calculation unit at the start of heating is when the mass of the cooking container is large or when the amount of oil put into the cooking container is large, and the cooking container is The calculated temperature from the start of heating until the predetermined time elapses only when the temperature is equal to or higher than the predetermined temperature set to be smaller than the temperature rise of the calculated temperature from the start of heating when it is properly placed until the predetermined time elapses. In order to determine whether the temperature rise is less than a predetermined threshold and determine whether the cooking container is placed in an inappropriate position, the amount of food and oil that can be put into the cooking container when the cooking container is large in mass It is possible to accurately determine whether the placement position is inappropriate even when there is a large amount of food, and it is possible to reduce the chance that the cooking container is placed inappropriately and be heated, thereby improving safety and improving usability.

本発明の実施の形態1に係る誘導加熱調理器の構成を示すブロック図である。It is a block diagram which shows the structure of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る誘導加熱調理器の赤外線センサの回路図である。It is a circuit diagram of the infrared sensor of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る誘導加熱調理器の赤外線センサの出力特性グラフである。It is an output characteristic graph of the infrared sensor of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る誘導加熱調理器の温度算出部の温度算出グラフである。It is a temperature calculation graph of the temperature calculation part of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係る誘導加熱調理器の調理容器の載置位置が不適切な状態を示す図である。It is a figure which shows the state in which the mounting position of the cooking container of the induction heating cooking appliance which concerns on Embodiment 1 of this invention is inappropriate. 本発明の実施の形態1に係る誘導加熱調理器の調理容器の載置位置が不適切で照明などの赤外線を検出しているときの赤外線センサの特性グラフである。It is a characteristic graph of an infrared sensor when the mounting position of the cooking container of the induction heating cooking appliance which concerns on Embodiment 1 of this invention is inadequate, and detecting infrared rays, such as illumination. 本発明の実施の形態1に係る誘導加熱調理器の動作を示すフローチャートThe flowchart which shows operation | movement of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. 従来の誘導加熱調理器のブロック図である。It is a block diagram of the conventional induction heating cooking appliance.

第1の発明に係る誘導加熱調理器は、赤外線が透過する材料で形成されたトッププレートと、高周波電流が供給されることによって、前記トッププレート上に載置された調理容器を誘導加熱する加熱コイルと、前記加熱コイルに前記高周波電流を供給するインバータ回路と、前記調理容器の底面から放射され、前記トッププレートを透過した赤外線を検出して前記底面温度に応じた検出信号を増幅器により増幅して出力する赤外線センサと、前記赤外線センサの出力から前記底面温度を算出する底面温度算出部と、前記底面温度算出部の出力に基づいて、前記インバータ回路の加熱出力を制御する加熱制御部とを備えた誘導加熱調理器であって、前記赤外線センサは、前記調理容器の底面温度の増加に対し、前記赤外線センサの出力の増加率が所定の温度未満では略ゼロで、前記所定の温度以上のときにべき乗関数的に増加するように、前記増幅器の増幅率が設定され、前記加熱制御部は、加熱開始時に前記底面温度算出部の算出温度が前記所定温度以上であり、かつ加熱開始から所定時間経過するまでの前記算出温度の温度上昇が所定のしきい値未満のときに前記加熱出力の抑制あるいは前記インバータ回路の加熱動作の停止を行い、前記所定のしきい値は前記調理容器の質量が大きい場合又は前記調理容器に入れられる油の量が多量の場合であり、かつ前記調理容器が適切に載置されたときの加熱開始から前記所定時間経過するまでの前記算出温度の温度上昇より小さくなるように設定されるものである。これによって、加熱開始時の底面温度算出部の算出温度が所定温度以上のときにのみ加熱開始から所定時間経過するまでの算出温度の温度上昇が所定のしきい値未満かどうかを判断して調理容器の載置位置が不適切かを判定するため、調理容器の質量が大きい場合や調理容器に入れられる食材や油の量が多量で加熱経過時間に対する温度上昇が少ない場合にも精度よく調理容器の載置位置が不適正かを判断することができ、調理容器が不適切に載置されて加熱される機会を減らし安全性を高め、使い勝手を良くすることができる。 An induction heating cooker according to a first aspect of the present invention is a heating that induction-heats a cooking vessel placed on the top plate by being supplied with a top plate formed of a material that transmits infrared rays and a high-frequency current. A coil, an inverter circuit that supplies the high-frequency current to the heating coil, and infrared rays that are radiated from the bottom surface of the cooking vessel and transmitted through the top plate, and a detection signal corresponding to the bottom surface temperature is amplified by an amplifier. An infrared sensor that outputs the temperature, a bottom surface temperature calculation unit that calculates the bottom surface temperature from the output of the infrared sensor, and a heating control unit that controls the heating output of the inverter circuit based on the output of the bottom surface temperature calculation unit. An induction heating cooker provided, wherein the infrared sensor increases an output rate of the infrared sensor with respect to an increase in a bottom surface temperature of the cooking container. The amplification factor of the amplifier is set so that it is substantially zero below a predetermined temperature and increases as a power function when the temperature is equal to or higher than the predetermined temperature, and the heating control unit Suppressing the heating output or stopping the heating operation of the inverter circuit when the calculated temperature is equal to or higher than the predetermined temperature and the temperature rise of the calculated temperature from the start of heating until a predetermined time elapses is less than a predetermined threshold value gastric row, said predetermined threshold is a case where the amount of oil to be taken into or if the cooking vessel mass of the cooking container is large multimers, and heating when the cooking vessel is properly placed It is set to be smaller than the temperature rise of the calculated temperature from the start until the predetermined time elapses . Thus, cooking is performed by determining whether the temperature rise of the calculated temperature from the start of heating until a predetermined time elapses is less than a predetermined threshold only when the calculated temperature of the bottom surface temperature calculation unit at the start of heating is equal to or higher than the predetermined temperature. In order to determine whether the placement position of the container is inappropriate, the cooking container can be used accurately even when the mass of the cooking container is large, or when the amount of food and oil put into the cooking container is large and the temperature rise with respect to the elapsed heating time is small. It is possible to determine whether or not the mounting position of the cooking container is improper, and it is possible to reduce the chance that the cooking container is improperly placed and heated, thereby improving safety and improving usability.

第2の発明に係る誘導加熱調理器は、特に、第1の発明に係る誘導加熱調理器において、加熱制御部は、加熱開始時に底面温度算出部の算出温度が所定温度以上であり、かつ加熱開始から所定時間経過するまでの算出温度の温度上昇が所定のしきい値未満のときに加熱出力の抑制あるいはインバータ回路の加熱動作の停止をすると、その旨を使用者に音や表示装置などの報知部により報知するものである。これによって、使用者に載置位置が不適正であることの注意を促がすことができる。   The induction heating cooker according to the second invention is, in particular, the induction heating cooker according to the first invention, wherein the heating control unit is configured such that the calculated temperature of the bottom surface temperature calculation unit is equal to or higher than a predetermined temperature at the start of heating, and is heated. If the heating output is suppressed or the heating operation of the inverter circuit is stopped when the temperature rise of the calculated temperature from the start until the predetermined time elapses is less than the predetermined threshold value, a message such as a sound or a display device is sent to the user. This is notified by the notification unit. This can alert the user that the placement position is inappropriate.

第3の発明に係る誘導加熱調理器のためのプログラムは、赤外線が透過する材料で形成されたトッププレートと、高周波電流が供給されることによって、前記トッププレート上に載置された調理容器を誘導加熱する加熱コイルと、前記加熱コイルに前記高周波電流を供給するインバータ回路と、前記調理容器の底面から放射され、前記トッププレートを透過した赤外線を検出して前記底面温度に応じた検出信号を増幅器により増幅して出力する赤外線センサと、前記赤外線センサの出力から前記底面温度を算出する底面温度算出部と、前記底面温度算出部の出力に基づいて、前記インバータ回路の加熱出力を制御する加熱制御部とを備え、前記赤外線センサは、前記調理容器の底面温度の増加に対し、前記赤外線センサの出力の増加率が所定の温度未満では前記検出信号の大きさの増加率が略ゼロで、前記所定の温度以上のときにべき乗関数的に増加するように、前記増幅器の増幅率を設定し、前記加熱制御部が、加熱開始時に前記底面温度算出部の算出温度が前記所定温度以上のときに、加熱開始から所定時間経過するまでの前記算出温度の温度上昇が所定のしきい値未満のときに前記加熱出力の抑制あるいは前記インバータ回路の加熱動作の停止を行い、前記所定のしきい値は前記調理容器の質量が大きい場合又は前記調理容器に入れられる油の量が多量の場合であり、かつ前記調理容器が適切に載置されたときの加熱開始から所定時間経過するまでの前記算出温度の温度上昇より小さくなるように設定されるステップを含むことを特徴とするコンピュータにより実行されるものである。これによって、加熱開始時の底面温度算出部の算出温度が所定温度以上のときにのみ加熱開始から所定時間経過するまでの算出温度の温度上昇が所定のしきい値未満かどうかを判断して調理容器の載置位置が不適切かを判定することにより、調理容器の質量が大きい場合や調理容器に入れられる食材や油の量が多量で加熱経過時間に対する温度上昇が少ない場合にも精度よく調理容器の載置位置が不適正かを判断する機能をコンピュータにより実行させることのできる誘導加熱調理器を提供することができる。また、プログラムであるので、電気・情報機器、コンピュータ、サーバ等のハードリソースを協働させて本発明の誘導加熱調理器の少なくとも一部を容易に実現することができる。また記録媒体に記録したり通信回線を用いてプログラムを配信したりすることでプログラムの配布・更新やそのインストール作業が簡単にできる。 A program for an induction heating cooker according to a third aspect of the present invention includes a top plate formed of a material that transmits infrared rays, and a cooking vessel placed on the top plate by being supplied with a high-frequency current. A heating coil for induction heating, an inverter circuit for supplying the high-frequency current to the heating coil, and an infrared ray radiated from the bottom surface of the cooking vessel and transmitted through the top plate to detect a detection signal corresponding to the bottom surface temperature An infrared sensor that amplifies and outputs by an amplifier, a bottom surface temperature calculation unit that calculates the bottom surface temperature from the output of the infrared sensor, and heating that controls the heating output of the inverter circuit based on the output of the bottom surface temperature calculation unit e Bei and a control unit, the infrared sensor with respect to an increase in the temperature of the bottom surface of the cooking vessel, the rate of increase in the output of the infrared sensor a predetermined The amplification rate of the amplifier is set so that the increase rate of the magnitude of the detection signal is substantially zero below the temperature and increases as a power function when the temperature is equal to or higher than the predetermined temperature, and the heating control unit When the calculated temperature of the bottom surface temperature calculation unit is equal to or higher than the predetermined temperature at the start, the heating output is suppressed when the temperature rise of the calculated temperature from the start of heating to a predetermined time is less than a predetermined threshold value or There line to stop the heating operation of the inverter circuit, wherein the predetermined threshold is a case where the amount of oil to be taken into or if the cooking vessel mass of the cooking container is large multimers, and the cooking vessel is properly also executed by a computer, characterized in that it comprises the steps set as the start of heating when placed smaller than the temperature rise of the calculated temperature until a predetermined time elapses It is. Thus, cooking is performed by determining whether the temperature rise of the calculated temperature from the start of heating until a predetermined time elapses is less than a predetermined threshold only when the calculated temperature of the bottom surface temperature calculation unit at the start of heating is equal to or higher than the predetermined temperature. Precise cooking even when the mass of the cooking container is large, or when the amount of food and oil that can be put in the cooking container is large and the temperature rise with respect to the elapsed heating time is small by determining whether the container placement position is inappropriate It is possible to provide an induction heating cooker capable of causing a computer to execute a function of determining whether the placement position of the container is inappropriate. Moreover, since it is a program, at least one part of the induction heating cooking appliance of this invention can be easily implement | achieved by cooperating hard resources, such as an electrical / information apparatus, a computer, and a server. In addition, the program can be distributed / updated and installed easily by recording on a recording medium or distributing the program using a communication line.

第4の発明に係る誘導加熱調理器のためのプログラムは、特に、第3の発明のプログラムにおいて、加熱制御部が、加熱開始時に前記底面温度算出部の算出温度が前記所定温度以上のときに、加熱開始から所定時間経過するまでの前記算出温度の温度上昇が所定のしきい値未満のときに前記加熱出力の抑制あるいは前記インバータ回路の加熱動作の停止をしたとき、その旨を使用者に報知部により報知するステップをさらに含むものである。これによって、さらに、使用者に載置位置が不適正であることの注意を促がすことができる。   A program for an induction heating cooker according to a fourth aspect of the invention is particularly the program of the third aspect of the invention, wherein the heating control unit is configured such that when the calculated temperature of the bottom surface temperature calculating unit is equal to or higher than the predetermined temperature at the start of heating. When the heating output is suppressed or the heating operation of the inverter circuit is stopped when the temperature rise of the calculated temperature from the start of heating to the elapse of a predetermined time is less than a predetermined threshold value, a message to that effect is given to the user. It further includes a step of notifying by the notifying unit. This can further alert the user that the placement position is inappropriate.

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、この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 embodiments.

(実施の形態1)
図1は、本発明の実施の形態1に係る誘導加熱調理器の構成を示すブロック図である。
(Embodiment 1)
FIG. 1 is a block diagram showing the configuration of the induction heating cooker according to Embodiment 1 of the present invention.

図1において、機器上面に設けられたトッププレート1と、高周波磁界を発生させることによって、トッププレート1上の調理容器2を誘導加熱する加熱コイル3とを備える。   In FIG. 1, a top plate 1 provided on the upper surface of the apparatus and a heating coil 3 for induction heating the cooking vessel 2 on the top plate 1 by generating a high frequency magnetic field are provided.

トッププレート1は、結晶化セラミックや耐熱ガラスなどの板状の電気絶縁物からなり、赤外線を透過する。加熱コイル3は、トッププレート1の下方に設けられている。加熱コイル3は、同心円状に2分割されて互いに電気的に接続された外コイル3aと内コイル3bで構成されている(図示せず)。   The top plate 1 is made of a plate-like electrical insulator such as crystallized ceramic or heat-resistant glass, and transmits infrared rays. The heating coil 3 is provided below the top plate 1. The heating coil 3 is composed of an outer coil 3a and an inner coil 3b that are divided into two concentric circles and are electrically connected to each other (not shown).

調理容器2は、加熱コイル3の高周波磁界により発生した渦電流によって、底面が発熱する。外コイル3aと内コイル3bの間に、調理容器2の発熱時の底面の温度分布を均一化させるため、隙間3cが設けられている。   The bottom surface of the cooking container 2 generates heat due to the eddy current generated by the high frequency magnetic field of the heating coil 3. A gap 3c is provided between the outer coil 3a and the inner coil 3b in order to uniformize the temperature distribution on the bottom surface of the cooking container 2 when heat is generated.

トッププレート1の使用者側には、複数のスイッチを含む操作部4が設けられている。例えば、加熱の開始/停止などを使用者が指示するための加熱開始/停止スイッチが操作部4に含まれる。例えば、スイッチはタッチキーで構成することができる。   An operation unit 4 including a plurality of switches is provided on the user side of the top plate 1. For example, the operation unit 4 includes a heating start / stop switch for the user to instruct the start / stop of heating. For example, the switch can be configured with a touch key.

赤外線センサ5は、加熱コイル3で加熱される調理容器2の底面から放射される赤外線を測定するように配置される。赤外線センサ5は、加熱コイル3の中心の上方に位置する調理容器2の底面部分の温度を測定するように配置しても良いが、加熱コイル3の中心から偏心した調理容器2の底面部分の温度を測定するように設けることが好ましい。一般的に、加熱コイル3の外周と内周の間の巻線部分の上方の調理容器2の底面部分は、加熱コイル3の中心の上方部分よりも高温となるからである。本実施の形態では、外コイル3aと内コイル3bとの間の隙間3cの下方に設けられる。外コイル3aと内コイル3bとの間の隙間3cの上方は、加熱コイル3の中心の上方よりも加熱コイル3の高周波磁界が強いため、調理容器2の底面の略最高温度を検出することができる。   The infrared sensor 5 is arranged to measure infrared rays emitted from the bottom surface of the cooking vessel 2 heated by the heating coil 3. The infrared sensor 5 may be arranged so as to measure the temperature of the bottom surface portion of the cooking container 2 located above the center of the heating coil 3, but the bottom surface portion of the cooking container 2 eccentric from the center of the heating coil 3. It is preferably provided to measure the temperature. This is because the bottom surface portion of the cooking container 2 above the winding portion between the outer periphery and the inner periphery of the heating coil 3 generally has a higher temperature than the upper portion at the center of the heating coil 3. In the present embodiment, it is provided below the gap 3c between the outer coil 3a and the inner coil 3b. The upper part of the gap 3c between the outer coil 3a and the inner coil 3b has a higher high-frequency magnetic field of the heating coil 3 than the upper part of the center of the heating coil 3, so that the substantially maximum temperature of the bottom surface of the cooking vessel 2 can be detected. it can.

調理容器2の底面から放射された、調理容器2の底面温度に対応して放射される赤外線は、トッププレート1を通って入射し、外コイル3aと内コイル3bとの間の隙間3cを通って、赤外線センサ5により受光される。赤外線センサ5は、受光した赤外線を検出し、検出した赤外線量に対応した赤外線検出信号6を出力する。   Infrared rays radiated from the bottom surface of the cooking vessel 2 corresponding to the bottom temperature of the cooking vessel 2 enter through the top plate 1 and pass through the gap 3c between the outer coil 3a and the inner coil 3b. And received by the infrared sensor 5. The infrared sensor 5 detects the received infrared ray and outputs an infrared detection signal 6 corresponding to the detected amount of infrared ray.

加熱コイル3の下方には、商用電源7から供給される交流電圧を平滑された直流電圧に変換する整流平滑部8と、整流平滑部8から直流電圧が供給されて高周波電流を生成し、生成した高周波電流を加熱コイル3に出力するインバータ回路9とが設けられる。   Below the heating coil 3, a rectifying / smoothing unit 8 that converts an AC voltage supplied from the commercial power supply 7 into a smoothed DC voltage, and a DC voltage supplied from the rectifying / smoothing unit 8 generates a high-frequency current. And an inverter circuit 9 for outputting the high frequency current to the heating coil 3.

整流平滑部8は、ブリッジダイオードで構成される全波整流器20と、全波整流器20の出力端子間に接続された、チョークコイル21及び平滑コンデンサ22で構成されるローパスフィルタとを有する。   The rectifying / smoothing unit 8 includes a full-wave rectifier 20 composed of a bridge diode, and a low-pass filter composed of a choke coil 21 and a smoothing capacitor 22 connected between output terminals of the full-wave rectifier 20.

インバータ回路9は、スイッチング素子23(本実施の形態ではIGBT)と、スイッチング素子23と逆並列に接続されたダイオード24と、加熱コイル3に並列に接続された共振コンデンサ25とを有する。   The inverter circuit 9 includes a switching element 23 (IGBT in the present embodiment), a diode 24 connected in antiparallel with the switching element 23, and a resonant capacitor 25 connected in parallel with the heating coil 3.

インバータ回路9のスイッチング素子23がオン/オフすることによって、インバータ回路9及び加熱コイル3に高周波電流が発生する。インバータ回路9と加熱コイル3は、高周波インバータを構成する。   When the switching element 23 of the inverter circuit 9 is turned on / off, a high frequency current is generated in the inverter circuit 9 and the heating coil 3. The inverter circuit 9 and the heating coil 3 constitute a high frequency inverter.

加熱制御部10は、スイッチング素子23のオン/オフを制御する駆動信号を出力することによって、インバータ回路9から加熱コイル3に供給される高周波電流を制御する。   The heating control unit 10 controls a high-frequency current supplied from the inverter circuit 9 to the heating coil 3 by outputting a drive signal for controlling on / off of the switching element 23.

加熱制御部10は、操作部4から送信される信号と、赤外線センサ5が検出し温度算出部11で算出された温度とに基づいて、スイッチング素子23のオン/オフを制御する。   The heating control unit 10 controls on / off of the switching element 23 based on the signal transmitted from the operation unit 4 and the temperature detected by the infrared sensor 5 and calculated by the temperature calculation unit 11.

報知部26は、加熱制御部10からの信号に基づき、音や表示装置により使用者に報知する。   The notification unit 26 notifies the user by sound or a display device based on the signal from the heating control unit 10.

図2は、本発明の実施の形態1に係る誘導加熱調理器の赤外線センサ5の回路図を示す。図2において、赤外線センサ5は、フォトダイオード51と、オペアンプ52と、抵抗53、54とを有する。抵抗53、54の一端はフォトダイオード51のカソードに接続され、抵抗54の他端はオペアンプ52の出力端子に接続され、抵抗53の他端は反転入力端子に接続されている。フォトダイオード51のアノードおよびオペアンプ52の非反転入力端子はともに接地(共通電位に接続)されている。   FIG. 2 shows a circuit diagram of infrared sensor 5 of the induction heating cooker according to Embodiment 1 of the present invention. In FIG. 2, the infrared sensor 5 includes a photodiode 51, an operational amplifier 52, and resistors 53 and 54. One ends of the resistors 53 and 54 are connected to the cathode of the photodiode 51, the other end of the resistor 54 is connected to the output terminal of the operational amplifier 52, and the other end of the resistor 53 is connected to the inverting input terminal. Both the anode of the photodiode 51 and the non-inverting input terminal of the operational amplifier 52 are grounded (connected to a common potential).

フォトダイオード51は、トッププレート1を透過するおよそ3ミクロン以下の波長の赤外線が照射されると出力電流が流れるシリコン等で形成された受光素子であり、調理容器2から放射される赤外線を受光できる位置に設けられる。オペアンプ52は、電流変換回路及び増幅回路を構成する。   The photodiode 51 is a light receiving element formed of silicon or the like through which an output current flows when irradiated with infrared light having a wavelength of about 3 microns or less that passes through the top plate 1, and can receive infrared light emitted from the cooking vessel 2. Provided in position. The operational amplifier 52 constitutes a current conversion circuit and an amplifier circuit.

フォトダイオード51により発生した電流は、オペアンプ52によって増幅され、調理容器2の温度を示す赤外線検出信号6(電圧値V0に相当)として、加熱制御部10に出力される。   The current generated by the photodiode 51 is amplified by the operational amplifier 52 and output to the heating control unit 10 as an infrared detection signal 6 (corresponding to the voltage value V0) indicating the temperature of the cooking vessel 2.

赤外線センサ5は、調理容器2から放射される赤外線を受光するため、トッププレート1の裏面に接触しトッププレートを介して伝導熱を検出することにより調理容器2の温度を検出するサーミスタを使用する方法と比較して、熱応答性が良い。   Infrared sensor 5 uses a thermistor that detects the temperature of cooking vessel 2 by detecting the heat of conduction through the top plate in contact with the back surface of top plate 1 in order to receive infrared rays emitted from cooking vessel 2. Compared with the method, thermal response is better.

図3は、本発明の実施の形態1に係る誘導加熱調理器の赤外線センサ5の出力特性グラフを示す。図3において、横軸は調理容器2の底面温度であり、縦軸は赤外線センサ5が出力する赤外線検出信号6の電圧値を示す。   FIG. 3 shows an output characteristic graph of the infrared sensor 5 of the induction heating cooker according to the first embodiment of the present invention. In FIG. 3, the horizontal axis represents the bottom surface temperature of the cooking container 2, and the vertical axis represents the voltage value of the infrared detection signal 6 output from the infrared sensor 5.

本実施の形態では、調理容器2の揚げ物等の温度制御ができるように、赤外線センサ5は、調理容器2の底面温度が約120℃以上のときに赤外線検出信号6を出力し、約120℃未満のときは赤外線検出信号6を出力しないように、オペアンプ52の増幅率が設定されている。   In the present embodiment, the infrared sensor 5 outputs the infrared detection signal 6 when the bottom surface temperature of the cooking container 2 is about 120 ° C. or higher so that the temperature of the fried food of the cooking container 2 can be controlled, and about 120 ° C. If it is less than the value, the amplification factor of the operational amplifier 52 is set so that the infrared detection signal 6 is not output.

この場合の「赤外線検出信号6を出力しない」とは、赤外線検出信号6を全く出力しないだけでなく、実質的に出力しないこと、すなわち温度算出部11が赤外線検出信号6の大きさの変化に基づいて調理容器2の底面の温度変化を実質的に読み取れない程の微弱な信号を出力することを含む。なお、「赤外線検出信号6を出力しない」、すなわち赤外線検出信号6の大きさが略ゼロとなるようにする代わりに、調理容器2の底面の温度に異存しない一定の値となるようにし、赤外線検出信号6の増加率が所定の温度以下では略ゼロとなるようにしても良い。   In this case, “not outputting the infrared detection signal 6” means not only outputting the infrared detection signal 6 but also not substantially outputting it, that is, the temperature calculation unit 11 changes the magnitude of the infrared detection signal 6. Based on outputting a weak signal that cannot substantially read the temperature change of the bottom surface of the cooking container 2. In addition, instead of making “the infrared detection signal 6 not output”, that is, the magnitude of the infrared detection signal 6 become substantially zero, the infrared detection signal 6 is set to a constant value that does not depend on the temperature of the bottom surface of the cooking container 2. You may make it the increase rate of the detection signal 6 become substantially zero, below predetermined temperature.

赤外線検出信号6の出力値は、信号を出力する範囲、すなわち、調理容器2の温度Tが約120℃以上になると、出力値が略ゼロより大きくなるように、増幅回路52の増幅率が設定される。赤外線検出信号6の出力値V0は、調理容器2の温度Tが約120℃より上昇すると、調理容器2の温度TのX乗(例えば、X=6〜9)に比例した値となって、被加熱物の温度が高くなればなるほど増加の傾きが増加する非線形的な単調増加特性を示し、温度Tの増加に対して、いわゆる累(べき)乗関数(V0=αT)(αは比例定数)のように増加する。 The output value of the infrared detection signal 6 is set so that the amplification value of the amplification circuit 52 is set so that the output value becomes larger than approximately zero when the signal output range, that is, when the temperature T of the cooking container 2 is about 120 ° C. or higher. Is done. When the temperature T of the cooking container 2 rises from about 120 ° C., the output value V0 of the infrared detection signal 6 becomes a value proportional to the X power of the temperature T of the cooking container 2 (for example, X = 6 to 9), It shows a non-linear monotonically increasing characteristic in which the slope of the increase increases as the temperature of the object to be heated increases, and the so-called power function (V0 = αT X ) (α is proportional to the increase in temperature T Constant).

図4は、本発明の実施の形態1に係る誘導加熱調理器の温度算出部の温度算出グラフである。   FIG. 4 is a temperature calculation graph of the temperature calculation unit of the induction heating cooker according to the first embodiment of the present invention.

図4において、温度算出部11が赤外線検出信号6の電圧値から調理容器2の底面温度を算出するために用いる赤外線センサ5の出力特性を示している。図4において、縦軸は調理容器2の底面温度Tであり、横軸は赤外線センサ5が出力する赤外線検出信号6の電圧値を示す。赤外線センサ5の出力が0mVのとき約T10(℃)と算出されるように設定され、T10(℃)以上の温度が検出できるように設定されている。   In FIG. 4, the output characteristic of the infrared sensor 5 used for the temperature calculation unit 11 to calculate the bottom surface temperature of the cooking container 2 from the voltage value of the infrared detection signal 6 is shown. In FIG. 4, the vertical axis represents the bottom surface temperature T of the cooking container 2, and the horizontal axis represents the voltage value of the infrared detection signal 6 output from the infrared sensor 5. When the output of the infrared sensor 5 is 0 mV, it is set to be calculated as about T10 (° C.), and is set so that a temperature equal to or higher than T10 (° C.) can be detected.

図4の赤外線センサ5は、例えば、揚げ物などにおける油温の温度調節に用いることができる120℃〜220℃の温度検知領域に適した特性を有するものを使用している。赤外線検出信号6の電圧値がほぼ0のときからの赤外線検出信号6の電圧値の変化ΔVに対する温度変化をΔT1とし、赤外線検出信号6の電圧値がV2のように大きいときの赤外線検出信号6の電圧値の変化ΔVに対する温度変化をΔT2としたとき、ΔT1≫ΔT2となる特性になっている。   The infrared sensor 5 of FIG. 4 uses, for example, a sensor having characteristics suitable for a temperature detection region of 120 ° C. to 220 ° C. that can be used for temperature adjustment of oil temperature in fried foods. The temperature change with respect to the change ΔV in the voltage value of the infrared detection signal 6 from when the voltage value of the infrared detection signal 6 is substantially 0 is ΔT1, and the infrared detection signal 6 when the voltage value of the infrared detection signal 6 is as large as V2. When the temperature change with respect to the voltage value change ΔV is ΔT2, ΔT1 >> ΔT2.

加熱制御部10は、加熱開始時に温度算出部11の算出温度が前記所定温度以上のときに、加熱開始から所定時間での前記底面温度の温度上昇ΔTが所定のしきい値Td未満のときに加熱出力の抑制あるいは加熱停止を行う。加熱制御部10は、加熱開始時に底面温度算出部11の算出温度が所定温度Tt以上であり、かつ加熱開始から所定時間t1経過するまでの算出温度の温度上昇が所定のしきい値Td未満のときに加熱出力の抑制あるいは加熱動作の停止をすると、その旨を音や表示装置により使用者に報知する。   When the temperature calculated by the temperature calculation unit 11 is equal to or higher than the predetermined temperature at the start of heating, the heating control unit 10 is when the temperature rise ΔT of the bottom surface temperature at a predetermined time from the start of heating is less than a predetermined threshold Td. Suppress heating output or stop heating. The heating control unit 10 is configured such that the calculated temperature of the bottom surface temperature calculating unit 11 is equal to or higher than the predetermined temperature Tt at the start of heating, and the temperature rise of the calculated temperature from the start of heating to the elapse of the predetermined time t1 is less than the predetermined threshold Td When the heating output is sometimes suppressed or the heating operation is stopped, the user is notified by sound or a display device.

以上のように構成された誘導加熱調理器について、以下、その動作および作用について説明する。   The operation and action of the induction heating cooker configured as described above will be described below.

図1において、調理容器2が加熱コイル3上のほぼ中央に置かれ、赤外線センサ5が調理容器2の底から放射される赤外線を受光している場合には、加熱開始前は調理容器2が常温であれば、赤外線センサ5の出力は図3のセンサの出力特性からほぼ0mVとなり温度算出部6の特性からT10(℃)と算出される。本実施の形態においては、T10(℃)は約120℃である。   In FIG. 1, when the cooking container 2 is placed almost at the center on the heating coil 3 and the infrared sensor 5 receives infrared rays emitted from the bottom of the cooking container 2, the cooking container 2 is At normal temperature, the output of the infrared sensor 5 is approximately 0 mV from the output characteristics of the sensor of FIG. 3 and is calculated as T10 (° C.) from the characteristics of the temperature calculation unit 6. In the present embodiment, T10 (° C.) is about 120 ° C.

操作部4が操作され、加熱が開始されると、加熱コイル3に高周波電流が供給され調理容器2の底面は誘導加熱される。加熱開始から所定時間t1経過するまで加熱されると調理容器2の温度が上昇し、赤外線センサ5の出力はΔVとなる。所定時間t1は、例えば75秒とすることができる。このとき、調理容器2の温度は、T1(℃)まで温度上昇したと算出される。このように、温度算出部11は、図4の特性から調理容器2の温度が算出する。このとき所定時間t1加熱されたことによる容器2の温度上昇はΔT1と算出される。   When the operation unit 4 is operated and heating is started, a high-frequency current is supplied to the heating coil 3 and the bottom surface of the cooking vessel 2 is induction-heated. When the cooking container 2 is heated until a predetermined time t1 elapses from the start of heating, the temperature of the cooking container 2 rises and the output of the infrared sensor 5 becomes ΔV. The predetermined time t1 can be set to 75 seconds, for example. At this time, the temperature of the cooking vessel 2 is calculated to have risen to T1 (° C.). Thus, the temperature calculation part 11 calculates the temperature of the cooking container 2 from the characteristic of FIG. At this time, the temperature rise of the container 2 due to the heating for a predetermined time t1 is calculated as ΔT1.

図5は、本発明の実施の形態1に係る誘導加熱調理器において、調理容器の載置位置が不適切な状態を示す図であり、図6は本発明の実施の形態1に係る誘導加熱調理器の調理容器の載置位置が不適切で、さらに照明などの赤外線を検出しているときの赤外線センサの特性グラフを2点鎖線Aで示している。   FIG. 5 is a diagram illustrating a state in which the placement position of the cooking container is inappropriate in the induction heating cooker according to Embodiment 1 of the present invention, and FIG. 6 is induction heating according to Embodiment 1 of the present invention. A characteristic graph of the infrared sensor when the placement position of the cooking container of the cooking device is inappropriate and infrared rays such as illumination are detected is indicated by a two-dot chain line A.

図5において、調理容器2の中央が加熱コイル3の中央からずれて置かれ、赤外線センサ5が調理容器2底から放射される赤外線を受光してない場合には、加熱開始前は調理容器2が常温であっても照明や太陽光に含まれる赤外線を受光する場合には図6に示すように、赤外線センサ5は調理容器2の底面温度に依存しない一定の出力電圧V2を出力する。   In FIG. 5, when the center of the cooking vessel 2 is shifted from the center of the heating coil 3 and the infrared sensor 5 does not receive the infrared rays emitted from the bottom of the cooking vessel 2, the cooking vessel 2 is started before heating. When infrared rays contained in illumination or sunlight are received even at normal temperature, the infrared sensor 5 outputs a constant output voltage V2 that does not depend on the bottom surface temperature of the cooking vessel 2, as shown in FIG.

V2は図6では約400mVであるが、周囲の照度が明るければ大きくなる。V2は温度算出部11により図4の特性からT20(℃)と算出される。この場合においても、所定時間t1加熱されたとき調理容器2は調理容器2が中央に置かれていたときと同様にほぼΔT1(K)温度上昇する。   Although V2 is about 400 mV in FIG. 6, it becomes larger if the ambient illuminance is brighter. V2 is calculated as T20 (° C.) from the characteristics shown in FIG. Also in this case, when the cooking container 2 is heated for a predetermined time t1, the temperature of the cooking container 2 rises by substantially ΔT1 (K) as in the case where the cooking container 2 is placed in the center.

調理容器2の中央が加熱コイル3の中央からずれて置かれ、赤外線センサ5が調理容器2の底面から放射される赤外線を受光してない場合には、赤外線センサ5が調理容器2の側面から放射される赤外線を検出する場合がある。この場合に、赤外線センサ5の出力電圧においてΔVの出力電圧の増加が得られたとき、温度算出部11は図4に示す特性から調理容器2の底面温度がΔT2上昇したと算出する。このΔT2を、調理容器2の底面から放射する赤外線を赤外線センサ5で適切に受光できるように調理容器2を加熱コイル3の上方に置いたときの温度変化ΔT1と比較したときΔT1≫ΔT2となるので、加熱制御部10は、ΔT2がしきい値Td未満と判断して、加熱出力の抑制あるいは加熱停止を行う。   When the center of the cooking vessel 2 is shifted from the center of the heating coil 3 and the infrared sensor 5 does not receive infrared rays emitted from the bottom surface of the cooking vessel 2, the infrared sensor 5 is moved from the side of the cooking vessel 2. In some cases, the emitted infrared rays are detected. In this case, when an increase in the output voltage of ΔV is obtained in the output voltage of the infrared sensor 5, the temperature calculation unit 11 calculates that the bottom surface temperature of the cooking container 2 has increased by ΔT2 from the characteristics shown in FIG. When this ΔT2 is compared with the temperature change ΔT1 when the cooking container 2 is placed above the heating coil 3 so that the infrared ray radiated from the bottom surface of the cooking container 2 can be properly received by the infrared sensor 5, ΔT1 >> ΔT2. Therefore, the heating control unit 10 determines that ΔT2 is less than the threshold value Td, and suppresses heating output or stops heating.

このように、加熱制御部10は、加熱開始時に底面温度算出部11の算出温度が所定温度Tt以上であり、かつ加熱開始後所定時間t1経過するまで加熱したときの温度上昇値ΔTが所定のしきい値Td以上ならば調理容器2の載置位置が適切で、調理容器2底の温度が検出できると判断でき加熱を継続しても安全であり、一方加熱開始時に底面温度算出部11の算出温度が所定温度Tt以上であり、かつ加熱開始後所定時間t1経過するまで加熱したときの温度上昇値ΔTが所定のしきい値Td未満ならば調理容器2の載置位置が不適切で調理容器2の底の温度が検出できないと判断でき、危険なため加熱を停止する。   As described above, the heating control unit 10 has a predetermined temperature increase value ΔT when the temperature calculated by the bottom surface temperature calculation unit 11 is equal to or higher than the predetermined temperature Tt at the start of heating and the predetermined time t1 elapses after the heating starts. If it is equal to or greater than the threshold value Td, it can be determined that the placement position of the cooking container 2 is appropriate and the temperature of the bottom of the cooking container 2 can be detected, and it is safe to continue heating. If the calculated temperature is equal to or higher than the predetermined temperature Tt and the temperature rise value ΔT when heated until the predetermined time t1 elapses after the start of heating is less than the predetermined threshold Td, the cooking container 2 is placed at an inappropriate position and cooked. It can be determined that the temperature of the bottom of the container 2 cannot be detected, and heating is stopped because of danger.

図7は、本発明の実施の形態1に係る誘導加熱調理器の動作を示すフローチャートである。   FIG. 7 is a flowchart showing the operation of the induction heating cooker according to the first embodiment of the present invention.

図7において、加熱が開始されると初期の赤外線センサ5の検知温度Tsが所定のしきい値Tt以上か否かを判定する(S701)。Ts≧Ttのとき所定の出力で加熱を開始する(S703)。次いで、所定時間経過したかどうか判別し(S704)、所定時間t1経過したら初期の赤外線センサ5の検知温度Tsからの温度上昇値ΔTが所定のしきい値Td以上か否かを判定する(S705)。   In FIG. 7, when heating is started, it is determined whether or not the detected temperature Ts of the initial infrared sensor 5 is equal to or higher than a predetermined threshold value Tt (S701). When Ts ≧ Tt, heating is started with a predetermined output (S703). Next, it is determined whether or not a predetermined time has elapsed (S704), and when the predetermined time t1 has elapsed, it is determined whether or not the temperature rise value ΔT from the detected temperature Ts of the initial infrared sensor 5 is equal to or greater than a predetermined threshold Td (S705). ).

ΔT<dならば調理容器2の載置位置が不適切として加熱を停止し(S706)、ΔT≧dならば載置位置が適切として加熱を継続する。 [Delta] T <mounting position of the T d if the cooking container 2 stops heating as inappropriate (S706), ΔT ≧ T d If mounting position continues to heat as appropriate.

所定のしきい値Tdは調理容器の質量が大きい場合や調理容器に入れられる油の量が多量の場合に調理容器2が適切に載置されたときの温度上昇値ΔTより小さくなるように設定されている。そのため調理容器2の質量が大きい場合や調理容器2に入れられる油の量が多量の場合にも誤って載置位置が不適切と判定することはない。図4では、所定のしきい値Ttは、一例として、約150℃としている。調理容器2の温度が所定のしきい値Ttから更に上昇したとき、上記ΔT1に対応するΔTt(上記ΔVに対応する値はΔVt)は、さらに赤外線センサ5の出力電圧がΔVt増加したときの温度上昇値ΔTt2の1.5倍以上になるような温度を選んだほうが望ましい。このようにすることで、赤外線センサ5の出力値が立ち上がったことを明確に検知することができる。また、ΔVt(所定のしきい値Ttに対応する)は、調理容器2が適切に載置されたときに外乱光で赤外線センサ5が受光しうる最大値よりも大きく設定されることが望ましい。   The predetermined threshold value Td is set to be smaller than the temperature rise value ΔT when the cooking container 2 is properly placed when the mass of the cooking container is large or when the amount of oil put into the cooking container is large. Has been. Therefore, even when the mass of the cooking container 2 is large or when the amount of oil put into the cooking container 2 is large, it is not erroneously determined that the placement position is inappropriate. In FIG. 4, the predetermined threshold value Tt is about 150 ° C. as an example. When the temperature of the cooking vessel 2 further rises from the predetermined threshold value Tt, ΔTt corresponding to the ΔT1 (the value corresponding to the ΔV is ΔVt) is the temperature when the output voltage of the infrared sensor 5 further increases by ΔVt. It is desirable to select a temperature that is at least 1.5 times the increase value ΔTt2. By doing so, it is possible to clearly detect that the output value of the infrared sensor 5 has risen. Further, it is desirable that ΔVt (corresponding to the predetermined threshold value Tt) be set larger than the maximum value that the infrared sensor 5 can receive with disturbance light when the cooking container 2 is properly placed.

以上説明したように、本実施の形態においては、加熱開始時の底面温度算出部の算出結果が所定温度以上のときにのみ加熱開始から所定時間経過するまでの算出温度の温度上昇が調理容器の質量が大きい場合又は調理容器に入れられる油の量が多量の場合であり、かつ調理容器が適切に載置されたときの加熱開始から所定時間経過するまでの算出温度の温度上昇より小さくなるように設定される所定のしきい値未満かどうかを判断して調理容器の載置位置が不適切かを判定することにより、調理容器が不適切に載置されて加熱される機会を減らし安全性を高めると共に、調理容器の質量が大きい場合や調理容器に入れられる食材や油の量が多量の場合にも精度よく載置位置が不適正かを判断可能で使い勝手を向上させることができる。 As described above, in the present embodiment, the temperature rise of the calculated temperature from the start of heating until the predetermined time elapses only when the calculation result of the bottom surface temperature calculation unit at the start of heating is equal to or higher than the predetermined temperature . When the mass is large or when the amount of oil put into the cooking container is large, and the temperature rises below the calculated temperature from the start of heating when the cooking container is properly placed until the predetermined time elapses. By determining whether the placement position of the cooking container is inappropriate by judging whether it is less than the predetermined threshold set in the above, the chance of the cooking container being placed inappropriately and being heated is reduced and safety In addition, it is possible to accurately determine whether the placement position is inappropriate even when the mass of the cooking container is large or when the amount of food or oil put into the cooking container is large, and usability can be improved.

なお、本実施の形態で説明した手段は、CPU(またはマイクロコンピュータ)、RAM、ROM、記憶・記録装置、I/Oなどを備えた電気・情報機器、コンピュータ、サーバ等のハードリソースを協働させるプログラムの形態で実施してもよい。プログラムの形態であれば、磁気メディアや光メディアなどの記録媒体に記録したりインターネットなどの通信回線を用いて配信したりすることで新しい機能の配布・更新やそのインストール作業が簡単にできる。   The means described in this embodiment cooperates with hardware resources such as a CPU (or microcomputer), a RAM, a ROM, a storage / recording device, an electric / information device including an I / O, a computer, a server, and the like. You may implement with the form of the program to be made. In the form of a program, new functions can be distributed / updated and installed easily by recording them on a recording medium such as magnetic media or optical media or distributing them using a communication line such as the Internet.

以上のように、本発明に係る誘導加熱調理器は、調理容器の載置位置が適切かどうかを精度よく判断して安全に加熱することが可能となるので、一般家庭などで使用される調理機器として有効である。   As described above, the induction heating cooker according to the present invention can accurately determine whether or not the mounting position of the cooking container is appropriate, and can be heated safely. It is effective as a device.

1 トッププレート
2 調理容器
3 加熱コイル
3a 外コイル(加熱コイル)
3b 内コイル(加熱コイル)
3c 隙間(加熱コイル)
4 操作部
5 赤外線センサ
9 インバータ回路
10 加熱制御部
11 温度算出部(底面温度算出部)
26 報知部
1 Top plate 2 Cooking container 3 Heating coil 3a Outer coil (heating coil)
3b Inner coil (heating coil)
3c Clearance (heating coil)
4 Operation part 5 Infrared sensor 9 Inverter circuit 10 Heating control part 11 Temperature calculation part (bottom surface temperature calculation part)
26 Notification Department

Claims (4)

赤外線が透過する材料で形成されたトッププレートと、
高周波電流が供給されることによって、前記トッププレート上に載置された調理容器を誘導加熱する加熱コイルと、
前記加熱コイルに前記高周波電流を供給するインバータ回路と、
前記調理容器の底面から放射され、前記トッププレートを透過した赤外線を検出して前記底面温度に応じた検出信号を増幅器により増幅して出力する赤外線センサと、
前記赤外線センサの出力から前記底面温度を算出する底面温度算出部と、
前記底面温度算出部の出力に基づいて、前記インバータ回路の加熱出力を制御する加熱制御部とを備え、
前記赤外線センサは、前記調理容器の底面温度の増加に対し、前記赤外線センサの出力の増加率が所定の温度未満では略ゼロで、前記所定の温度以上のときにべき乗関数的に増加するように、前記増幅器の増幅率が設定され、
前記加熱制御部は、加熱開始時に前記底面温度算出部の算出温度が前記所定温度以上であり、かつ加熱開始から所定時間経過するまでの前記算出温度の温度上昇が所定のしきい値未満のときに前記加熱出力の抑制あるいは前記インバータ回路の加熱動作の停止を行い、前記所定のしきい値は前記調理容器の質量が大きい場合又は前記調理容器に入れられる油の量が多量の場合に前記調理容器が適切に載置されたときの加熱開始から前記所定時間経過するまでの前記算出温度の温度上昇より小さくなるように設定されることを特徴とする誘導加熱調理器。
A top plate formed of a material that transmits infrared rays;
A heating coil for induction heating the cooking vessel placed on the top plate by being supplied with a high-frequency current;
An inverter circuit for supplying the high-frequency current to the heating coil;
An infrared sensor that radiates from the bottom surface of the cooking container, detects infrared light transmitted through the top plate, and amplifies and outputs a detection signal corresponding to the bottom surface temperature;
A bottom surface temperature calculation unit that calculates the bottom surface temperature from the output of the infrared sensor;
Based on the output of the bottom temperature calculation unit, e Bei a heating control section for controlling the heating output of the inverter circuit,
The infrared sensor is configured such that the increase rate of the output of the infrared sensor is substantially zero when the temperature is lower than a predetermined temperature and increases as a power function when the temperature is equal to or higher than the predetermined temperature with respect to an increase in the bottom temperature of the cooking container. , The amplification factor of the amplifier is set,
The heating control unit is configured such that at the start of heating, the calculated temperature of the bottom surface temperature calculating unit is equal to or higher than the predetermined temperature, and the temperature increase of the calculated temperature from the start of heating until a predetermined time elapses is less than a predetermined threshold value. wherein when the large amount the suppression of heating output or have rows to stop the heating operation of the inverter circuit, the amount of oil the predetermined threshold to be put when the mass is large or the cooking container of the cooking container An induction heating cooker characterized by being set to be smaller than a temperature rise of the calculated temperature from the start of heating when the cooking container is properly placed until the predetermined time elapses .
前記加熱制御部は、加熱開始時に前記底面温度算出部の算出温度が前記所定温度以上であり、かつ加熱開始から所定時間経過するまでの前記算出温度の温度上昇が前記所定のしきい値未満のときに前記加熱出力の抑制あるいは前記インバータ回路の加熱動作の停止をすると、その旨を使用者に報知部により報知することを特徴とする請求項1に記載の誘導加熱調理器。 The heating control unit calculates the temperature of the bottom surface temperature calculation unit at the start of heating is not less the predetermined temperature or higher, and the temperature rise of the calculated temperature from the start of heating until a predetermined time has elapsed is less than the predetermined threshold 2. The induction heating cooker according to claim 1, wherein when the heating output is sometimes suppressed or the heating operation of the inverter circuit is stopped, a notification to that effect is given to the user. 赤外線が透過する材料で形成されたトッププレートと、
高周波電流が供給されることによって、前記トッププレート上に載置された調理容器を誘導加熱する加熱コイルと、
前記加熱コイルに前記高周波電流を供給するインバータ回路と、
前記調理容器の底面から放射され、前記トッププレートを透過した赤外線を検出して前記底面温度に応じた検出信号を増幅器により増幅して出力する赤外線センサと、
前記赤外線センサの出力から前記底面温度を算出する底面温度算出部と、
前記底面温度算出部の出力に基づいて、前記インバータ回路の加熱出力を制御する加熱制御部とを備え、
前記赤外線センサは、前記調理容器の底面温度の増加に対し、前記赤外線センサの出力の増加率が所定の温度以下では前記検出信号の大きさの増加率が略ゼロで、前記所定の温度以上のときにべき乗関数的に増加するように、前記増幅器の増幅率を設定し、
前記加熱制御部が、加熱開始時に前記底面温度算出部の算出温度が前記所定温度以上のときに、加熱開始から所定時間経過するまでの前記算出温度の温度上昇が所定のしきい値未満のときに前記加熱出力の抑制あるいは前記インバータ回路の加熱動作の停止を行い、前記所定のしきい値は前記調理容器の質量が大きい場合又は前記調理容器に入れられる油の量が多量の場合に前記調理容器が適切に載置されたときの加熱開始から所定時間経過するまでの前記算出温度の温度上昇より小さくなるように設定されるステップを含むことを特徴とするコンピュータにより実行される、誘導加熱調理器のためのプログラム。
A top plate formed of a material that transmits infrared rays;
A heating coil for induction heating the cooking vessel placed on the top plate by being supplied with a high-frequency current;
An inverter circuit for supplying the high-frequency current to the heating coil;
An infrared sensor that radiates from the bottom surface of the cooking container, detects infrared light transmitted through the top plate, and amplifies and outputs a detection signal corresponding to the bottom surface temperature;
A bottom surface temperature calculation unit that calculates the bottom surface temperature from the output of the infrared sensor;
Based on the output of the bottom temperature calculation unit, e Bei a heating control section for controlling the heating output of the inverter circuit,
The infrared sensor has an increase rate of the output of the infrared sensor equal to or lower than a predetermined temperature with respect to an increase in the bottom surface temperature of the cooking container. Set the amplification factor of the amplifier so that it sometimes increases exponentially,
When the heating control unit calculates a temperature rise of the calculated temperature from the start of heating until a predetermined time elapses below a predetermined threshold when the calculated temperature of the bottom surface temperature calculating unit is equal to or higher than the predetermined temperature at the start of heating. wherein when the large amount the suppression of heating output or have rows to stop the heating operation of the inverter circuit, the amount of oil the predetermined threshold to be put when the mass is large or the cooking container of the cooking container Induction heating executed by a computer, comprising a step set to be smaller than a temperature rise of the calculated temperature from the start of heating when the cooking container is properly placed until a predetermined time elapses Program for cooker.
前記加熱制御部が、加熱開始時に前記底面温度算出部の算出温度が前記所定温度以上のときに、加熱開始から所定時間経過するまでの前記算出温度の温度上昇が所定のしきい値未満のときに前記加熱出力の抑制あるいは前記インバータ回路の加熱動作の停止をしたとき、その旨を使用者に報知部により報知するステップをさらに含むことを特徴とする請求項3に記載のプログラム。   When the heating control unit calculates a temperature rise of the calculated temperature from the start of heating until a predetermined time elapses below a predetermined threshold when the calculated temperature of the bottom surface temperature calculating unit is equal to or higher than the predetermined temperature at the start of heating. 4. The program according to claim 3, further comprising a step of notifying a user to that effect when the heating output is suppressed or the heating operation of the inverter circuit is stopped.
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