JP2014116176A - Induction heating cooker - Google Patents

Induction heating cooker Download PDF

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JP2014116176A
JP2014116176A JP2012269058A JP2012269058A JP2014116176A JP 2014116176 A JP2014116176 A JP 2014116176A JP 2012269058 A JP2012269058 A JP 2012269058A JP 2012269058 A JP2012269058 A JP 2012269058A JP 2014116176 A JP2014116176 A JP 2014116176A
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heating
detection circuit
temperature detection
temperature
current
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Shuzo Kishimoto
秀三 岸本
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Panasonic Corp
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Panasonic Corp
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Abstract

PROBLEM TO BE SOLVED: To solve a problem of resulting in an inability to stop heating due to an inability to detect a trouble that a resistance value of a temperature detection element always becomes almost constant.SOLUTION: An induction heating cooker comprises: an induction heating coil 4, an inverter circuit 9, a current detection circuit 7 and a temperature detection circuit 3. In the induction heating cooker, when an output signal from the temperature detection circuit 3 does not change by a second predetermined value and over until an integrated value of a current measured by the current detection circuit 7 after heating starts reaches or exceeds a first predetermined value, it is detected that the temperature detection circuit 3 has a breakdown and heating is stopped.

Description

本発明は、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.

従来、この種の誘導加熱調理器は、負荷となる鍋等の近傍に温度検出素子を設置して、鍋等の温度を検出して火力の調節を行うことで、きめ細かな調理を実現すると共に、加熱対象物の異常加熱を防止している。   Conventionally, this type of induction heating cooker realizes fine cooking by installing a temperature detection element in the vicinity of a load pan etc., detecting the temperature of the pan etc. and adjusting the thermal power. The abnormal heating of the heating object is prevented.

温度検出素子にサーミスタを用いた場合、短絡あるいは断線故障は検出することができるが、常時一定の抵抗値となる故障については、検出が出来なかった。   When a thermistor is used as the temperature detection element, a short circuit or disconnection failure can be detected, but a failure that always has a constant resistance value cannot be detected.

この為、複数の温度検出素子を設置し、第１の温度検出素子が故障した場合には、第２の温度検出素子によって加熱を停止させる誘導加熱調理器が考案されている（例えば、特許文献１参照）。   For this reason, an induction heating cooker has been devised in which a plurality of temperature detection elements are installed and heating is stopped by the second temperature detection element when the first temperature detection element fails (for example, Patent Documents). 1).

特開平１１−３２９６９９号公報JP-A-11-329699

しかしながら、前記従来の技術では、温度検出素子が常時略一定の抵抗値となる故障については検出が出来ない為、万が一の前記故障の場合のバックアップのために１つの加熱手段に対して複数の温度検出素子を設ける必要があった。   However, since the conventional technology cannot detect a failure in which the temperature detection element always has a substantially constant resistance value, a plurality of temperatures are applied to one heating unit for backup in the event of the failure. It was necessary to provide a detection element.

また、複数の温度検出素子が常時一定の抵抗値となる故障が発生した場合には、加熱を停止することが出来なくなるおそれがあった。   In addition, when a failure occurs in which a plurality of temperature detection elements always have a constant resistance value, there is a possibility that heating cannot be stopped.

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、入力電流の積算値が第１の所定値以上となるまでに温度検出回路の出力信号が第２の所定値以上変化しない場合には、温度検出回路が故障と判断し、加熱を停止させる手段を講じた。   In order to solve the conventional problem, the induction heating cooker according to the present invention is such that the output signal of the temperature detection circuit does not change more than the second predetermined value until the integrated value of the input current becomes more than the first predetermined value. In some cases, the temperature detection circuit was determined to be out of order, and measures were taken to stop heating.

また、温度検出回路が故障と判断し、加熱停止を行った後も温度検出回路からの出力信号を測定し、所定値以上の変化があれば、温度検出回路は故障ではないと判断し、加熱を再開させる手段を講じた。   Also, even after the temperature detection circuit determines that there is a failure and the heating is stopped, the output signal from the temperature detection circuit is measured. Take measures to resume.

温度検出素子が常時略一定の抵抗値となる故障についても検知が可能となり、安全性の向上した誘導加熱調理器を提供できる。   It is possible to detect a failure in which the temperature detecting element always has a substantially constant resistance value, and an induction heating cooker with improved safety can be provided.

本発明の実施の形態における制御ブロック図Control block diagram in the embodiment of the present invention 本発明の実施の形態における制御フローチャートControl flowchart in the embodiment of the present invention

第１の発明は、加熱対象物を載置するトッププレートと、前記加熱対象物を加熱する誘
導加熱コイルと、前記誘導加熱コイルに高周波電流を供給するインバータ回路と、前記インバータ回路の動作を制御する制御部と、前記インバータ回路への入力電流を測定する電流検出回路と、前記トッププレート裏面に配置され、前記加熱対象物の温度を検出する温度検出回路とを備え、前記制御部は前記加熱対象物の加熱を開始した以降の前記電流検出回路の測定値を積算し、積算値が第１の所定値以上になるまでに前記温度検出回路の出力信号が第２の所定値以上変化しなければ、前記温度検出回路が故障していると判断して加熱を停止させる。これにより、温度検出素子が常時略一定の抵抗値となるような一見正常と見なされるような出力信号を発生したままの故障状態になったとしても実際には故障しているということが判断でき、安全に加熱を停止することが出来る。 1st invention controls the operation | movement of the top plate which mounts a heating target object, the induction heating coil which heats the said heating object, the inverter circuit which supplies a high frequency current to the said induction heating coil, and the said inverter circuit A control unit that measures the input current to the inverter circuit, and a temperature detection circuit that is disposed on the back surface of the top plate and detects the temperature of the object to be heated. The measured values of the current detection circuit after the heating of the object is started are integrated, and the output signal of the temperature detection circuit must change more than the second predetermined value until the integrated value becomes the first predetermined value or more. If so, it is determined that the temperature detection circuit has failed, and heating is stopped. This makes it possible to determine that the temperature detection element is actually in failure even if it becomes a failure state with an output signal that seems to be normal at first glance, such that the temperature detection element always has a substantially constant resistance value. Can safely stop heating.

第２の発明は、特に、第１の発明の制御部を、前記温度検出回路が故障していると判断して加熱を停止した以降に前記温度検出回路の出力信号が第３の所定値以上変化した場合には、前記温度検出回路は故障していないと判断し、加熱を再開するものとしたことにより、例えば、加熱対象物が沸騰状態等で温度検出素子が常時一定の抵抗値となり、誤って故障であると誤判定して、加熱を停止した場合においても、加熱停止以降、温度低下により温度検出回路からの出力信号が所定値以上変化すれば温度検知素子が故障していないと正しい判断をし直すことができ、改めて加熱を再開することが出来る。   In the second invention, in particular, after the controller of the first invention determines that the temperature detection circuit has failed and stops heating, the output signal of the temperature detection circuit is equal to or greater than a third predetermined value. When it has changed, it is determined that the temperature detection circuit has not failed, and heating is resumed.For example, the temperature detection element has a constant resistance value when the heating target is in a boiling state or the like, Even when heating is stopped by mistakenly determined as a failure, if the output signal from the temperature detection circuit changes by more than a predetermined value due to a temperature drop after heating stops, it is correct that the temperature detection element is not broken. The judgment can be made again and heating can be restarted.

第３の発明は、特に、第１の発明または第２の発明の制御部を、加熱停止時の前記電流検出回路の測定値に対して前記加熱対象物の加熱を開始してから所定時間後の前記電流検出回路の測定値が第４の所定値以上増加していない場合には、前記電流検出回路が故障していると判断して加熱を停止するものとしたことにより、電流検出回路の検出素子または回路の一部が故障して常時略一定の測定値となるような一見正常と見なされるような出力信号を発生したままの故障状態になったとしても実際には故障しているということが判断でき、安全に加熱を停止することができる。   In a third aspect of the invention, in particular, the control unit of the first aspect of the invention or the second aspect of the invention is a predetermined time after the heating of the heating object is started with respect to the measured value of the current detection circuit when heating is stopped. When the measured value of the current detection circuit is not increased by a fourth predetermined value or more, it is determined that the current detection circuit has failed and heating is stopped. Even if it becomes a failure state with an output signal that seems to be normal, such that a detection element or part of the circuit fails and always becomes a substantially constant measurement value, it is said that it is actually broken Therefore, it is possible to safely stop heating.

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における制御ブロック図を示すものである。 (Embodiment 1)
FIG. 1 is a control block diagram according to the embodiment of the present invention.

図１において、商用電源５から入力された商用交流は電流検出回路７を経由してＤＣ電源８に入力される。ＤＣ電源８は商用電源５から入力した商用交流を直流に変換しインバータ回路９へ入力する。マイクロコンピュータからなる制御部１０は、トッププレート２に載置された鍋などの加熱対象物１を所定の火力で加熱するために、電流検出回路７で検出した商用電源５からの入力電流が所定の火力に対応した電流値となるようにインバータ回路９を動作させて、トッププレート２の下方に配置した誘導加熱コイル４に高周波電流を印加し高周波磁界を発生させて加熱対象物１を誘導加熱する。温度検出回路３は、温度検出用の素子を加熱対象物１の下方に位置するトッププレート２の裏面に配置して、加熱される加熱対象物１の温度を検知し、制御部１０に検知温度を伝達する。制御部１０は、温度検出回路３の検知温度に基づいて、加熱対象物１が過熱されないようにインバータ回路９の動作を制御する。   In FIG. 1, the commercial alternating current input from the commercial power source 5 is input to the DC power source 8 via the current detection circuit 7. The DC power supply 8 converts commercial alternating current input from the commercial power supply 5 into direct current and inputs it to the inverter circuit 9. In order to heat the heating target 1 such as a pan placed on the top plate 2 with a predetermined heating power, the control unit 10 including a microcomputer receives a predetermined input current from the commercial power source 5 detected by the current detection circuit 7. The inverter circuit 9 is operated so as to have a current value corresponding to the heating power, and a high-frequency current is applied to the induction heating coil 4 disposed below the top plate 2 to generate a high-frequency magnetic field, thereby heating the object 1 to be heated. To do. The temperature detection circuit 3 arranges a temperature detection element on the back surface of the top plate 2 positioned below the heating object 1, detects the temperature of the heating object 1 to be heated, and detects a temperature detected by the control unit 10. To communicate. The control unit 10 controls the operation of the inverter circuit 9 based on the temperature detected by the temperature detection circuit 3 so that the heating object 1 is not overheated.

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.

図２は本発明の実施の形態における制御フローチャートを示すものである。   FIG. 2 shows a control flowchart in the embodiment of the present invention.

図２における制御フローチャートは、開始から終了までの動作を例えば商用電源のゼロ電位のタイミングなどにより実行される他の動作を含めた一連の動作の１つとして繰り返
して実施されるものである。 The control flowchart in FIG. 2 is performed by repeating the operation from the start to the end as one of a series of operations including other operations executed at the timing of zero potential of the commercial power supply, for example.

まず、ＳＴ２０にて温度検出回路３により加熱対象物１の温度を測定し、ＳＴ２１にて電流検出回路７により入力電流を測定し、ＳＴ２２にてＩＨ加熱を行わないＩＨ加熱停止モードであればＳＴ４４に移行してＳＴ２０で測定した温度を温度検出回路故障判定用の基準ＡＤ値として記憶し、ＳＴ４５にてＳＴ２１で測定した入力電流を電流検出回路故障判定用の基準ＡＤ値として記憶し、フローチャートの動作を終了する。   First, the temperature of the heating object 1 is measured by the temperature detection circuit 3 in ST20, the input current is measured by the current detection circuit 7 in ST21, and if it is the IH heating stop mode in which IH heating is not performed in ST22, ST44. And the temperature measured in ST20 is stored as a reference AD value for temperature detection circuit failure determination, and the input current measured in ST21 is stored as a reference AD value for current detection circuit failure determination in ST45. End the operation.

一方、加熱開始指示によりＩＨ加熱モードとなると、ＳＴ２２からＳＴ２３に移行し、ＳＴ２３にてＩＨ発振中、すなわちインバータ回路９が駆動中であればＳＴ２４に移行して電流検出回路７の故障確認を行う。   On the other hand, when the IH heating mode is entered by the heating start instruction, the process proceeds from ST22 to ST23, and if the IH oscillation is performed at ST23, that is, if the inverter circuit 9 is being driven, the process proceeds to ST24 to check the failure of the current detection circuit 7. .

ＳＴ２４にてＩＨ発振を開始してからの経過時間が所定時間経過していなければ電流検出回路７の故障確認を行わずにＳＴ２９へ移行し、所定時間経過していればＳＴ２５へ移行して電流検出回路７の故障確認を行う。   If the predetermined time has not elapsed since the start of IH oscillation in ST24, the process proceeds to ST29 without confirming the failure of the current detection circuit 7, and if the predetermined time has elapsed, the process proceeds to ST25. The failure of the detection circuit 7 is confirmed.

ＳＴ２５にてＩＨ発振を開始してからの電流検出回路７により測定された入力電流の増加分を算出し、ＳＴ２６にて増加分が第４の所定値（本実施の形態においては、５ｄｉｇｉｔとする）以上であれば電流検出回路７が正常に作動していると判断してＳＴ２７にて電流検出回路故障フラグをクリアしてＳＴ２９へ移行する。一方、ＳＴ２６にて増加分が第４の所定値未満であれば電流検出回路７が故障していると判断し、ＳＴ２８にて電流検出回路故障フラグをセットして、ＳＴ２９へ移行する。   An increase in the input current measured by the current detection circuit 7 after starting the IH oscillation in ST25 is calculated. In ST26, the increase is set to a fourth predetermined value (in this embodiment, 5 digits). ) If it is above, it is determined that the current detection circuit 7 is operating normally, the current detection circuit failure flag is cleared in ST27, and the process proceeds to ST29. On the other hand, if the increase is less than the fourth predetermined value in ST26, it is determined that the current detection circuit 7 has failed, the current detection circuit failure flag is set in ST28, and the process proceeds to ST29.

なお、ＳＴ２４におけるＩＨ発振を開始してからの経過時間のカウントは、電源周波数波形成形回路６により商用電源５から入力した交流波形の１／２周期毎に発生する交流ゼロ電位点のタイミング信号を生成して制御部１０へ送ることにより制御部１０は交流ゼロ電位点のタイミング信号をカウントして計時するようにしている。ただし、経過時間のカウント方法は上記に限るものではなく、交流波形のゼロ電位点以外のタイミング信号によるものであってもよいし、交流波形によらず、マイクロコンピュータの原発振を含む外部の発振器などによる固定周期信号をカウントするものであってもよい。   The count of elapsed time from the start of IH oscillation in ST24 is the timing signal of the AC zero potential point generated every 1/2 cycle of the AC waveform input from the commercial power source 5 by the power frequency waveform shaping circuit 6. By generating and sending to the control unit 10, the control unit 10 counts the timing signal of the AC zero potential point and measures the time. However, the counting method of the elapsed time is not limited to the above, and may be based on a timing signal other than the zero potential point of the AC waveform, or an external oscillator including the original oscillation of the microcomputer regardless of the AC waveform For example, the fixed period signal may be counted.

次に、ＳＴ２９〜ＳＴ３５にて温度検出回路３の故障確認を行う。ＳＴ２９にてＩＨ発振を開始してからの温度検出回路３で測定された温度データの出力変化分を算出し、ＳＴ３０にて変化分が第２の所定値（本実施の形態においては、３ｄｉｇｉｔとする）以上（通常は温度上昇方向に変化する）であれば温度検出回路３が正常に作動していると判断してＳＴ３５にて温度検出回路故障フラグをクリアしてＳＴ３６へ移行する。一方、ＳＴ３０にて変化分が第２の所定値未満であれば積算電流を確認するためにＳＴ３１に移行する。   Next, failure check of the temperature detection circuit 3 is performed in ST29 to ST35. An output change amount of the temperature data measured by the temperature detection circuit 3 after starting the IH oscillation in ST29 is calculated, and in ST30, the change amount is a second predetermined value (in this embodiment, 3 digit and If it is above (usually changes in the temperature rising direction), it is determined that the temperature detection circuit 3 is operating normally, the temperature detection circuit failure flag is cleared in ST35, and the process proceeds to ST36. On the other hand, if the amount of change is less than the second predetermined value in ST30, the process proceeds to ST31 in order to confirm the integrated current.

ＳＴ３１にてＩＨ発振を開始した以降の入力電流、すなわち電流検出回路７からの出力信号を積算し、ＳＴ３２にて前記積算した積算値と別途設定された第１の所定値とを比較処理し、ＳＴ３３にて積算値が第１の所定値（本実施の形態においては、５０Ｗｈ相当とする）以上であれば温度検出回路３が故障していると判断してＳＴ３４にて温度検出回路故障フラグをセットしてＳＴ３６へ移行する。一方、ＳＴ３３にて積算値が第１の所定値未満であれば故障の判断はせずにＳＴ３５にて温度検出回路故障フラグをクリアしてＳＴ３６へ移行する。   In ST31, the input current after the start of IH oscillation, that is, the output signal from the current detection circuit 7, is integrated, and in ST32, the integrated value is compared with a first predetermined value set separately, If the integrated value is equal to or greater than the first predetermined value (in this embodiment, it is assumed to be equivalent to 50 Wh) in ST33, it is determined that temperature detection circuit 3 has failed, and the temperature detection circuit failure flag is set in ST34. Set and move to ST36. On the other hand, if the integrated value is less than the first predetermined value in ST33, the temperature detection circuit failure flag is cleared in ST35 without judging the failure, and the process proceeds to ST36.

次に、ＳＴ３６にて温度検出回路故障フラグがセットされていれば、ＳＴ３９にてＩＨ発振を停止してフローチャートの動作を終了し、温度検出回路故障フラグがクリアされていればＳＴ３７に移行して電流検出回路故障フラグの確認を行う。   Next, if the temperature detection circuit failure flag is set in ST36, the IH oscillation is stopped in ST39 and the operation of the flowchart is terminated. If the temperature detection circuit failure flag is cleared, the process proceeds to ST37. Check the current detection circuit failure flag.

ＳＴ３７にて電流検出回路故障フラグがセットされていれば、ＳＴ３９にてＩＨ発振を停止してフローチャートの動作を終了し、電流検出回路故障フラグがクリアされていればＳＴ３８にてＩＨ発振を許可することによりＩＨ発振中であればＩＨ発振を継続し、ＩＨ発振停止中であればＩＨ発振が再開される状態となり、フローチャートの動作を終了する。   If the current detection circuit failure flag is set in ST37, IH oscillation is stopped in ST39 and the operation of the flowchart is terminated. If the current detection circuit failure flag is cleared, IH oscillation is permitted in ST38. Thus, if the IH oscillation is in progress, the IH oscillation is continued. If the IH oscillation is stopped, the IH oscillation is resumed, and the operation of the flowchart is terminated.

ところで、ＳＴ２２にてＩＨ加熱モードであるときにＳＴ２３にてＩＨ発振停止中である場合は使用者の意図に反して何らかの要因にてＩＨ発振が停止している場合であると考えられる。その場合はＳＴ４０に移行して温度検出回路故障フラグがセットされていなければＳＴ３６に移行して故障要因に応じてＩＨ発振の許可または停止を決定する。一方、ＳＴ４０にて温度検出回路故障フラグがセットされているときは以前に温度検出回路３が故障していると判断してＩＨ発振を停止したことについて再度の検証を行うことができ、ＳＴ４１に移行してＩＨ発振を停止してからの温度検出回路３で測定された温度データの出力変化分を算出し、ＳＴ４２にて変化分が第３の所定値（本実施の形態においては、３ｄｉｇｉｔとする）以上（通常は温度低下方向に変化する）であれば温度検出回路３が正常に作動していると判断しなおしてＳＴ４３にて温度検出回路故障フラグをクリアしてＳＴ３６へ移行し、ＳＴ３８にてＩＨ発振が許可されてＩＨ発振が再開される状態となり、フローチャートの動作を終了する。   By the way, when the IH oscillation mode is stopped in ST23 when the IH heating mode is in ST22, it is considered that the IH oscillation is stopped for some reason against the user's intention. In this case, the process proceeds to ST40, and if the temperature detection circuit failure flag is not set, the process proceeds to ST36, where permission or stop of IH oscillation is determined according to the failure factor. On the other hand, when the temperature detection circuit failure flag is set in ST40, it can be determined that the temperature detection circuit 3 has previously failed and IH oscillation has been stopped, and the verification can be performed again in ST41. The amount of change in the output of the temperature data measured by the temperature detection circuit 3 after shifting and stopping the IH oscillation is calculated, and in ST42, the amount of change is a third predetermined value (in this embodiment, 3 digit and If it is above (usually changes in the temperature lowering direction), it is determined that the temperature detection circuit 3 is operating normally, the temperature detection circuit failure flag is cleared in ST43, and the process proceeds to ST36. IH oscillation is permitted and IH oscillation is resumed, and the operation of the flowchart ends.

以上の動作により、温度検出素子が常時略一定の抵抗値となるような一見正常と見なされるような温度信号を発生したままの故障状態になったとしても実際には故障しているということが判断でき、加熱を継続し続けることなく、安全に加熱を停止することができる。   By the above operation, even if the temperature detection element always has a substantially constant resistance value, even if it becomes a failure state while generating a temperature signal that seems to be normal, it means that it has actually failed. The heating can be safely stopped without continuing the heating.

また、上記検知方法を用いた場合に、例えば、加熱対象物が沸騰状態等で温度検出素子が常時一定の抵抗値となり、誤って故障であると誤判定して、加熱を停止してしまった場合においても、加熱停止以降、温度低下により温度検出回路からの出力信号が所定値以上変化すれば温度検知素子が故障していないと正しい判断をし直すことができ、改めて加熱を再開することができる。   Further, when the above detection method is used, for example, the temperature detection element always has a constant resistance value when the object to be heated is in a boiling state, etc. In this case, after the heating is stopped, if the output signal from the temperature detecting circuit changes by a predetermined value or more due to a temperature drop, it can be re-determined that the temperature detecting element has not failed, and heating can be restarted. it can.

また、電流検出回路の検出素子または回路の一部が故障して常時略一定の測定値となるような一見正常と見なされるような入力電流信号を発生し続けるような故障状態になったとしても実際には故障しているということが加熱開始直後に判断でき、回路部品や構成部品が故障するような過大な入力電流になるまで加熱出力を上昇してしまうことがなく、安全に加熱を停止することができる。   Even if the detection element or part of the circuit of the current detection circuit breaks down and it becomes a failure state that continues to generate an input current signal that seems to be normal at all times, such that it always becomes a substantially constant measurement value. In fact, it can be determined immediately after the start of heating that there is a failure, and the heating output will not rise until the input current becomes excessive so that the circuit components and components will fail, and the heating is safely stopped. can do.

また、ＩＨ発振開始からの入力電流積算値が所定値以上になる前、すなわち加熱対象物１の加熱が所定電力以上行われる前に、温度検出回路で検出した温度に所定温度以上の変化があれば、温度検出回路は正常であると判断し、発振を継続でき、電流検出回路７からの出力信号の積算値が所定値以上になったにもかかわらず、すなわち加熱対象物１の加熱が所定電力以上行われたにもかかわらず、温度検出回路で検出した温度に所定温度以上の変化が無い場合は、サーミスタを含む温度検出回路が故障していると判断し、ＩＨ発振の停止を行うことができる。   In addition, before the input current integrated value from the start of IH oscillation becomes a predetermined value or more, that is, before the heating of the heating object 1 is performed for a predetermined power or more, the temperature detected by the temperature detection circuit is changed by a predetermined temperature or more. For example, it is determined that the temperature detection circuit is normal and oscillation can be continued, and the heating of the heating object 1 is predetermined even though the integrated value of the output signal from the current detection circuit 7 has exceeded the predetermined value. If the temperature detected by the temperature detection circuit does not change more than the predetermined temperature even though the power is exceeded, it is determined that the temperature detection circuit including the thermistor has failed and IH oscillation is stopped. Can do.

以上のように、本発明にかかる誘導加熱調理器は、温度検知や入力電流検知の変動を監視して検知回路の正常または異常を判断できるので、負荷の温度制御や入力電流制御を行う加熱装置全般において適用することができる。   As described above, since the induction heating cooker according to the present invention can determine whether the detection circuit is normal or abnormal by monitoring temperature detection and fluctuations in input current detection, a heating device that performs load temperature control and input current control It can be applied in general.

１ 加熱対象物（鍋）
２ トッププレート
３ 温度検出回路
４ 誘導加熱コイル
５ 商用電源
６ 電源周波数波形成形回路
７ 電流検出回路
８ ＤＣ電源
９ インバータ回路
１０ 制御部 1 Heating object (pan)
2 Top plate 3 Temperature detection circuit 4 Induction heating coil 5 Commercial power supply 6 Power frequency waveform shaping circuit 7 Current detection circuit 8 DC power supply 9 Inverter circuit 10 Control unit

Claims (3)

加熱対象物を載置するトッププレートと、前記加熱対象物を加熱する誘導加熱コイルと、前記誘導加熱コイルに高周波電流を供給するインバータ回路と、前記インバータ回路の動作を制御する制御部と、前記インバータ回路への入力電流を測定する電流検出回路と、前記トッププレート裏面に設置され、前記加熱対象物の温度を検出する温度検出回路とを備え、前記制御部は前記加熱対象物の加熱を開始した以降の前記電流検出回路の測定値を積算し、積算値が第１の所定値以上になるまでに前記温度検出回路の出力信号が第２の所定値以上変化しなければ、前記温度検出回路が故障していると判断して加熱を停止するようにした誘導加熱調理器。   A top plate for placing the heating object; an induction heating coil for heating the heating object; an inverter circuit for supplying a high-frequency current to the induction heating coil; a control unit for controlling the operation of the inverter circuit; A current detection circuit that measures an input current to the inverter circuit; and a temperature detection circuit that is installed on the back surface of the top plate and detects the temperature of the heating object, and the controller starts heating the heating object. If the output value of the temperature detection circuit does not change more than a second predetermined value before the integrated value becomes equal to or higher than the first predetermined value, the temperature detection circuit Is an induction heating cooker that stops heating when it is judged to be out of order. 前記制御部は、前記温度検出回路が故障していると判断して加熱を停止した以降に前記温度検出回路の出力信号が第３の所定値以上変化した場合には、前記温度検出回路は故障していないと判断し、加熱を再開するようにした請求項１に記載の誘導加熱調理器。   When the control unit determines that the temperature detection circuit has failed and stops heating and the output signal of the temperature detection circuit has changed by a third predetermined value or more, the temperature detection circuit has failed. The induction heating cooker according to claim 1, wherein it is determined that the heating has not been performed and heating is resumed. 前記制御部は、加熱停止時の前記電流検出回路の測定値に対して前記加熱対象物の加熱を開始してから所定時間後の前記電流検出回路の測定値が第４の所定値以上増加していない場合には、前記電流検出回路が故障していると判断して加熱を停止するようにした請求項１または２に記載の誘導加熱調理器。   The control unit increases the measurement value of the current detection circuit after a predetermined time from the measurement value of the current detection circuit when heating is stopped by a fourth predetermined value or more after starting the heating of the heating object. If not, the induction heating cooker according to claim 1 or 2, wherein it is determined that the current detection circuit has failed and heating is stopped.
JP2012269058A 2012-12-10 2012-12-10 Induction heating cooker Pending JP2014116176A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160110845A (en) * 2015-03-13 2016-09-22 쿠쿠전자주식회사 Electric cooker
CN106981680A (en) * 2015-12-23 2017-07-25 罗伯特·博世有限公司 Conductive measurement layer for measuring potential difference
CN109924889A (en) * 2017-12-15 2019-06-25 佛山市顺德区美的电热电器制造有限公司 Method for heating and controlling, device, computer readable storage medium and cooking apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160110845A (en) * 2015-03-13 2016-09-22 쿠쿠전자주식회사 Electric cooker
KR101700750B1 (en) * 2015-03-13 2017-02-01 쿠쿠전자주식회사 Electric cooker
CN106981680A (en) * 2015-12-23 2017-07-25 罗伯特·博世有限公司 Conductive measurement layer for measuring potential difference
CN106981680B (en) * 2015-12-23 2021-12-31 罗伯特·博世有限公司 Conductive measurement layer for measuring potential differences
CN109924889A (en) * 2017-12-15 2019-06-25 佛山市顺德区美的电热电器制造有限公司 Method for heating and controlling, device, computer readable storage medium and cooking apparatus

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