JP5044977B2 - Induction heating cooker - Google Patents
Induction heating cooker Download PDFInfo
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- JP5044977B2 JP5044977B2 JP2006128805A JP2006128805A JP5044977B2 JP 5044977 B2 JP5044977 B2 JP 5044977B2 JP 2006128805 A JP2006128805 A JP 2006128805A JP 2006128805 A JP2006128805 A JP 2006128805A JP 5044977 B2 JP5044977 B2 JP 5044977B2
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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
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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
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
- H05B6/1218—Cooking devices induction cooking plates or the like and devices to be used in combination with them with arrangements using lights for heating zone state indication
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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
- 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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- Electromagnetism (AREA)
- Induction Heating Cooking Devices (AREA)
Description
本発明は、赤外線センサを用いた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 using an infrared sensor.
従来の誘導加熱調理器では、図６に示すように加熱コイル４３の中央に赤外線センサ４５を配置し、赤外線センサ４５からの出力に応じて制御手段３８はインバータ回路４４の出力を制御していた。赤外線センサ４５の上方には非磁性金属材料からなる導波管４６を配置して鍋４１から放射される赤外線のみを赤外線センサ４５に導き、また導波管４６の周囲には加熱コイル４３からの磁束による導波管４６の自己発熱を低減するために、加熱コイル４３下方に第１の防磁手段４９を、加熱コイル４３内側に第２の防磁手段５０をそれぞれ配置して、鍋底以外からの赤外線放射の影響を受けないようにしていた（例えば、特許文献１参照）。
しかしながら前記従来の構成では、赤外線センサ４５の出力は鍋４１からの赤外線放射が増加しないと変化しないため、赤外線センサ４５上方に鍋４１が載置されていないと温度検知ができないという課題があった。このため、赤外線センサ４５がどの部分に配置されているか使用者がわかるようにトッププレート４２に印刷をしていても、使用環境が暗い場合には印刷がわかりにくくなるため、赤外線センサ４５を加熱コイル４３の略中央に配置し、使用者が赤外線センサ４５の位置を意識しなくても赤外線センサ４５上に鍋４１が置かれる構成としていた。 However, in the conventional configuration, since the output of the infrared sensor 45 does not change unless infrared radiation from the pan 41 increases, there is a problem that the temperature cannot be detected unless the pan 41 is placed above the infrared sensor 45. . For this reason, even if printing is performed on the top plate 42 so that the user can know where the infrared sensor 45 is arranged, the printing becomes difficult to understand when the usage environment is dark. The pan 43 is arranged in the approximate center of the coil 43 so that the pan 41 is placed on the infrared sensor 45 without the user being aware of the position of the infrared sensor 45.
一方、赤外線センサ４５あるいは温度算出手段４７の異常についても、鍋４１が温度上昇しないとわからないという課題があった。また、ピーク感度波長が１μｍ近傍の赤外線センサ４５を使用する場合には、鍋４１が２００℃以上の高温になるまで赤外線センサ４５の出力が変化しないため、赤外線センサ４５近傍に配置したサーミスタなどを用いて異常を自己診断した時には、既に鍋が異常高温となっているという課題があった。このため、赤外線センサ４５による温度検知制御は湯沸かしや炊飯など１００℃近傍の温度領域での使用に制限していた。 On the other hand, regarding the abnormality of the infrared sensor 45 or the temperature calculation means 47, there is a problem that the pan 41 cannot be known unless the temperature rises. When using the infrared sensor 45 having a peak sensitivity wavelength of about 1 μm, the output of the infrared sensor 45 does not change until the pan 41 reaches a high temperature of 200 ° C. or higher. When using the self-diagnosis for abnormality, there was a problem that the pan was already at an abnormally high temperature. For this reason, the temperature detection control by the infrared sensor 45 is limited to use in a temperature region near 100 ° C. such as a kettle or rice cooker.
本発明は上記課題を解決するもので、使用者が赤外線センサの位置を一目で認識でき、かつ赤外線センサ４５の異常が加熱前に判断することの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 subject, and it aims at providing the induction heating cooker which a user can recognize the position of an infrared sensor at a glance, and the abnormality of the infrared sensor 45 can be judged before a heating. To do.
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、トッププレート面に光を照射する発光手段を赤外線センサの近傍に配置し、前記発光手段を点灯時に前記赤外線センサの出力が所定以下になると、インバータ回路の出力を制限するように構成されたものである。 In order to solve the conventional problem, the induction heating cooker of the present invention has a light emitting means for irradiating light on the top plate surface in the vicinity of the infrared sensor, and the output of the infrared sensor is output when the light emitting means is turned on. When it becomes below a predetermined value, the output of the inverter circuit is limited.
これにより、赤外線センサの上方のトッププレート面が発光して赤外線センサの位置が認識できるとともに、トッププレート面を照射する発光手段の光が赤外線センサに入射されて出力が変化するので、加熱開始前に赤外線センサの異常を判定して加熱制限することが可能となる。 As a result, the top plate surface above the infrared sensor emits light so that the position of the infrared sensor can be recognized, and the light of the light emitting means that irradiates the top plate surface enters the infrared sensor and the output changes. In addition, it is possible to limit the heating by determining the abnormality of the infrared sensor.
本発明の誘導加熱調理器は、赤外線センサの上方を光らせることが可能で使用者が赤外線センサの位置を認識しやすくなる。そのため使用者に赤外線センサ上に鍋を置くことを促しやすくなり、その結果、赤外線センサを使用目的に応じて自由に配置することが可能となる。また、赤外線センサの異常を加熱前に自己診断することが可能となり、赤外線センサを、焼き物や揚げ物の高温調理あるいは異常温度上昇防止に使用しても、赤外線センサの異常により鍋が過度に温度上昇することなく、安全に精度よく検知することが可能となる。 The induction heating cooker according to the present invention can shine above the infrared sensor, so that the user can easily recognize the position of the infrared sensor. Therefore, it becomes easy to prompt the user to place a pan on the infrared sensor, and as a result, the infrared sensor can be freely arranged according to the purpose of use. In addition, it is possible to self-diagnose abnormalities of the infrared sensor before heating, and even if the infrared sensor is used for high temperature cooking or prevention of abnormal temperature rise of grilled foods and fried foods, the temperature of the pan excessively increases due to abnormalities of the infrared sensor. Therefore, it is possible to detect safely and accurately.
第１の発明は、トッププレート上の鍋を加熱する加熱コイルと、前記加熱コイルに高周波電流を供給するインバータ回路と、前記加熱コイル下方に設けられ前記鍋から放射される赤外線を検知する赤外線センサと、前記赤外線センサの出力より鍋温度を算出する温度算出手段と、前記赤外線センサ近傍に配置され前記トッププレート面に赤色もしくは前記赤外線センサの感度波長領域での放射エネルギーが低くなる黄色や緑、青などの発光色の光を照射する発光手段と、前記温度算出手段からの出力に応じて前記インバータ回路の出力を制御する制御手段を備え、前記制御手段は前記加熱コイルによる加熱動作開始に先立ち前記発光手段を点灯もしくは点滅させるとともに、前記発光手段の点灯時における前記赤外線センサの出力が第１の所定値以下になると、前記インバータ回路の出力を制限する構成とすることにより、赤外線センサの上方のトッププレート面が発光して赤外線センサの位置が認識できるとともに、トッププレート面を照射する発光手段の光が赤外線センサに入射されて出力が変化するので、加熱開始前に赤外線センサの異常を判定して加熱制限することが可能となる。 1st invention is a heating coil which heats the pan on a top plate, an inverter circuit which supplies a high frequency current to the heating coil, and an infrared sensor which is provided under the heating coil and detects infrared rays radiated from the pan And temperature calculating means for calculating the pan temperature from the output of the infrared sensor, yellow or green that is arranged near the infrared sensor and red or radiant energy in the sensitivity wavelength region of the infrared sensor is reduced on the top plate surface , A light emitting means for irradiating light of an emission color such as blue, and a control means for controlling the output of the inverter circuit according to the output from the temperature calculating means, the control means prior to the start of the heating operation by the heating coil. with turning on or flashing the light emitting unit, at the output of the infrared sensor at the time of lighting of the light emitting means is in the first When the value is lower than the value, by limiting the output of the inverter circuit, the top plate surface above the infrared sensor emits light so that the position of the infrared sensor can be recognized and the light of the light emitting means that irradiates the top plate surface Is incident on the infrared sensor and the output changes, so that it is possible to determine the abnormality of the infrared sensor before heating is started and to limit the heating.
第２の発明は、特に第１の発明の制御手段を発光手段を点灯時に赤外線センサの出力が第１の所定値以下になるのに替えて発光手段点灯時と消灯時の赤外線センサの出力差が第２の所定値以下でインバータ回路の出力を制限する構成とすることにより、確実に発光手段の光に反応した赤外線センサの出力変化を検知することができ、発光手段の駆動回路の故障などで発光手段が点灯したまま機器を動作させることによる、赤外線センサの温度検知の誤検知を抑制することができる。 In the second invention, in particular, the control means of the first invention is replaced with the output difference of the infrared sensor between when the light emitting means is turned on and when the light emitting means is turned off, instead of the output of the infrared sensor being equal to or less than the first predetermined value when the light emitting means is turned on. Is configured to limit the output of the inverter circuit below the second predetermined value , so that it is possible to reliably detect the output change of the infrared sensor that has reacted to the light of the light emitting means, such as failure of the drive circuit of the light emitting means, etc. Thus, it is possible to suppress erroneous detection of the temperature detection of the infrared sensor by operating the device while the light emitting means is lit.
第３の発明は、特に、第１または第２の発明で前記加熱コイルによる加熱動作開始に先立ち発光手段を点灯させるときの赤外線センサ出力が、前記発光手段を消灯した状態における赤外線センサで制御する鍋温度での赤外線センサ出力より大きく、かつ、前記第１の所定値より大きくなるように、発光手段の出力を設定した構成とすることにより、赤外線センサで温度制御する範囲のセンサ出力が可能であることを判定することが可能となる。 In the third invention, in particular, the infrared sensor output when the light emitting means is turned on prior to the start of the heating operation by the heating coil in the first or second invention is controlled by the infrared sensor in a state where the light emitting means is turned off. By setting the output of the light emitting means to be larger than the infrared sensor output at the pan temperature and larger than the first predetermined value, the sensor output in the range where the temperature is controlled by the infrared sensor is possible. It is possible to determine that there is.
第４の発明は、鍋から赤外線センサへ赤外線を導光する導光手段を備え、特に、第１〜３の発明の発光手段から照射される光を前記導光手段にてトッププレート面に導光する構成とすることにより、赤外線センサにて温度検知するトッププレートの領域と、発光手段にて照射するトッププレートの領域を、より精度よく一致させることができる。 The fourth invention includes light guide means for guiding infrared light from the pan to the infrared sensor, and particularly guides light emitted from the light emitting means of the first to third inventions to the top plate surface by the light guide means. By adopting the light-emitting configuration, the region of the top plate where the temperature is detected by the infrared sensor and the region of the top plate irradiated by the light emitting means can be matched more accurately.
第５の発明は、特に、第４の発明の導光手段で、下側の穴径が上側より広くなるように導光手段に傾斜を設けた構成とすることにより、加熱コイルの隙間が狭くて導光手段の径が小さくなる場合においても、赤外線センサと発光手段を小型化する必要がなく、発光手段の光をトッププレートに導光させることが可能となる。 In the fifth invention, in particular, in the light guide means of the fourth invention, the gap of the heating coil is narrowed by providing the light guide means with an inclination so that the lower hole diameter is wider than the upper diameter. Even when the diameter of the light guide means is reduced, it is not necessary to reduce the size of the infrared sensor and the light emitting means, and the light of the light emitting means can be guided to the top plate.
第６の発明は、特に第４または第５の発明の導光手段を保持する保持部材と、赤外線センサと発光手段を固定するプリント配線板を備え、前記プリント配線板は前記保持部材にて保持する構成とすることにより、赤外線センサと発光手段の実装状態をより安定させることができ、また、プリント配線板に実装して赤外線センサと発光手段をひとつのユニットとすることで、制御手段への接続を簡素化することが可能となる。 The sixth invention includes a holding member for holding the light guiding means of the fourth or fifth invention and a printed wiring board for fixing the infrared sensor and the light emitting means, and the printed wiring board is held by the holding member. By adopting the configuration, the mounting state of the infrared sensor and the light emitting means can be further stabilized, and by mounting the infrared sensor and the light emitting means as one unit by mounting on the printed wiring board, The connection can be simplified.
第７の発明は、特に、第１〜６の発明の発光手段は加熱動作開始以降に消灯する構成とすることにより、加熱前は発光手段が点灯して赤外線センサの位置認識をしやすくするとともに、加熱中の鍋が温度上昇時には発光手段からの影響を受けることなく赤外線センサによる温度検知を精度よく行うことが可能となる。 In the seventh invention, in particular, the light emitting means of the first to sixth inventions are turned off after the heating operation is started , so that the light emitting means is turned on before heating so that the position of the infrared sensor can be easily recognized. When the temperature of the pan being heated rises, it is possible to accurately detect the temperature by the infrared sensor without being affected by the light emitting means.
第８の発明は、特に、第７の発明の発光手段は加熱動作開始後所定時間点灯した後に消灯する構成とすることにより、加熱開始後鍋を置く場合にも、点灯により赤外線センサの位置を認識しやすくするとともに、加熱開始する毎に赤外線センサが異常になっていないか自己診断することが可能となる。 In the eighth aspect of the invention, in particular, the light emitting means of the seventh aspect of the invention is configured to turn off after a predetermined period of time after starting the heating operation , so that the position of the infrared sensor can be turned on even when a pan is placed after the start of heating. While making it easy to recognize, it is possible to self-diagnose whether the infrared sensor is abnormal each time heating is started.
第９の発明は、２段階操作にて加熱開始させる加熱操作手段を備え、特に、第７および第８の発明の発光手段は前記加熱操作手段の１段目の操作時に点灯もしくは点滅し、前記加熱操作手段の２段目の操作時に消灯する構成とすることにより、使用者が加熱操作を開始した時のみ発光手段を点灯させることが可能となり、不要に発光手段を点灯させて使用者が煩わしいと感じることを低減することができる。また、発光手段の点灯時間を最小限とすることができるので、経年変化による発光手段の照度低下を抑制することができる。 The ninth invention comprises a heating operation means for starting heating in a two-stage operation, and in particular, the light-emitting means of the seventh and eighth inventions are turned on or blinking during the first operation of the heating operation means, By adopting a configuration in which the light is turned off when the heating operation means is operated at the second stage, the light emitting means can be turned on only when the user starts the heating operation, and the user is bothered by turning on the light emitting means unnecessarily. Can be reduced. Moreover, since the lighting time of the light emitting means can be minimized, it is possible to suppress a decrease in illuminance of the light emitting means due to secular change.
第１０の発明は、インバータ回路の出力により鍋の有無を検知する鍋検知手段を備え、特に、第７〜９の発明の発光手段を、加熱動作開始後に前記鍋検知手段で鍋なし判定された場合に点灯する構成とすることにより、加熱開始後、トッププレート上に鍋が置かれていない状態において、赤外線センサの位置を使用者に認識させることが可能となる。 10th invention is equipped with the pan detection means which detects the presence or absence of a pan by the output of an inverter circuit, and especially the light emission means of the invention of 7th- 9th was judged that there was no pan by the said pan detection means after heating operation start . By adopting a configuration that lights up in some cases, it is possible to make the user recognize the position of the infrared sensor in a state where no pan is placed on the top plate after the start of heating.
第１１の発明は、機器の動作手段を表示する表示手段を備え、特に、第１〜１０の発明のインバータ回路の出力を制限する際に前記表示手段にて表示を行う構成とすることにより、赤外線センサが異常であることを使用者が容易に識別することが可能となる。 The eleventh aspect of the invention comprises display means for displaying the operation means of the device, and in particular, by limiting the output of the inverter circuit of the first to tenth aspects of the invention, the display means is configured to perform display. The user can easily identify that the infrared sensor is abnormal.
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、本発明の第１の実施の形態におけるブロック図を示すものである。
(Embodiment 1)
FIG. 1 is a block diagram according to the first embodiment of the present invention.
図１において、１１は負荷鍋、１２は負荷鍋１１を載置するトッププレート、１３は負荷鍋１１を加熱する加熱コイルで内コイル１３ａと外コイル１３ｂの分割巻き構成としている。１４は加熱コイル１３から負荷鍋１１への磁束を集中するフェライト、１５は加熱コイル１３およびフェライト１４を保持する加熱コイル支持台で赤外線の透過率が低い樹脂材料にて構成されている。１６は赤外線センサ、１７は発光手段で赤色の発光ダイオードにて構成され、トッププレート１２の方向に向けて取り付けられている。１８は負荷鍋１１からの赤外線放射を赤外線センサに導光し、かつ発光手段１７から放射する光をトッププレート１２へ導光する導光手段、１９は赤外線センサ１６の出力より温度を算出する温度算出手段、２０は使用者が機器の加熱操作を行う加熱操作手段、２１は機器の動作状態を表示する表示手段、２２は加熱コイル１３に高周波電流を供給するインバータ回路、２３はインバータ回路２２からの出力信号によりトッププレート１２の上に鍋が載置されていることを検知する鍋検知手段、２４は温度算出手段１９からの信号に応じてインバータ回路２２の出力を制御する制御手段である。 In FIG. 1, 11 is a load pan, 12 is a top plate on which the load pan 11 is placed, and 13 is a heating coil for heating the load pan 11 and has an inner coil 13a and an outer coil 13b. 14 is a ferrite that concentrates the magnetic flux from the heating coil 13 to the load pan 11, and 15 is a heating coil support that holds the heating coil 13 and the ferrite 14, and is made of a resin material having low infrared transmittance. Reference numeral 16 denotes an infrared sensor, and reference numeral 17 denotes a light emitting means, which is configured by a red light emitting diode, and is attached toward the top plate 12. 18 is a light guide means for guiding the infrared radiation from the load pan 11 to the infrared sensor and the light emitted from the light emitting means 17 to the top plate 12, and 19 is a temperature for calculating the temperature from the output of the infrared sensor 16. Calculation means, 20 is a heating operation means for a user to heat the apparatus, 21 is a display means for displaying the operation state of the apparatus, 22 is an inverter circuit for supplying a high-frequency current to the heating coil 13, and 23 is from the inverter circuit 22. The pan detection means 24 detects that the pan is placed on the top plate 12 based on the output signal, and 24 is a control means for controlling the output of the inverter circuit 22 in accordance with the signal from the temperature calculation means 19.
図２は、本発明の第１の実施の形態における操作表示部の一例を示すものである。 FIG. 2 shows an example of the operation display unit in the first embodiment of the present invention.
図２において、加熱操作手段２０内に５つのスイッチが配置されており、表示手段２１内には３桁のデジタル表示部３０が配置されている。 In FIG. 2, five switches are arranged in the heating operation means 20, and a three-digit digital display section 30 is arranged in the display means 21.
図３は、本発明の第１の実施の形態における赤外線センサ１６と発光手段１７および導光手段１８近傍の詳細図である。 FIG. 3 is a detailed view of the vicinity of the infrared sensor 16, the light emitting means 17, and the light guiding means 18 according to the first embodiment of the present invention.
図３において、３１は導光手段１８を保持する保持部材で、３２は赤外線センサ１６および発光手段１７を固定するプリント配線板、３３はプリント配線板３２を保持部材３１に固定するビスで、プリント配線板３２と保持部材３１を加熱コイル支持台１５に共締めしている。 3, 3 1 in the holding member for holding the light guiding means 18, 32 is a printed circuit board for fixing the infrared sensor 16 and the light emitting means 17, 33 is a screw for fixing the printed wiring board 32 to the holding member 31, The printed wiring board 32 and the holding member 31 are fastened together with the heating coil support base 15.
図４および図５は、本発明の第１の実施の形態における加熱動作、発光手段１８の点灯、赤外線センサ１６の出力のタイミングを示す図である。 4 and 5 are diagrams showing the timing of the heating operation, the lighting of the light emitting means 18, and the output of the infrared sensor 16 in the first embodiment of the present invention.
以上のように構成された誘導加熱調理器についてその動作を説明する。 The operation | movement is demonstrated about the induction heating cooking appliance comprised as mentioned above.
加熱を開始するとインバータ回路２１は加熱コイル１３に高周波電流を供給して、トッププレート１２上に載置された負荷鍋１１は加熱コイル１３からの磁束より自己発熱する。負荷鍋１１の温度が上昇すると負荷鍋１１の鍋底から放射される赤外線量が増加する。負荷鍋１１から放射される赤外線は導光手段１８を通って赤外線センサ１６に入射される。赤外線センサ１６の出力は温度算出手段１９にて温度換算されて、所定温度を超えると制御手段２４はインバータ回路２３の出力を低下させている。 When heating is started, the inverter circuit 21 supplies a high-frequency current to the heating coil 13, and the load pan 11 placed on the top plate 12 self-heats from the magnetic flux from the heating coil 13. When the temperature of the load pan 11 rises, the amount of infrared rays emitted from the bottom of the load pan 11 increases. The infrared rays radiated from the load pan 11 are incident on the infrared sensor 16 through the light guide means 18. The output of the infrared sensor 16 is converted into temperature by the temperature calculation means 19, and when the temperature exceeds a predetermined temperature, the control means 24 reduces the output of the inverter circuit 23.
機器の操作は図２に示すように加熱操作手段２０で操作され、加熱スイッチ２８をオンした後、切入スイッチ２９をオンして加熱を開始する２段階操作としている。 As shown in FIG. 2, the operation of the apparatus is performed by the heating operation means 20, and after the heating switch 28 is turned on, the cutting switch 29 is turned on to start heating.
発光手段１７は、図４に示すように加熱スイッチ２８をオンする前は、消灯している。この時、赤外線センサ１６の出力は赤外線センサ１６の上に負荷鍋１１が載置されていると、光が入射しないためＶ０と低い値を示している。 The light emitting means 17 is turned off before the heating switch 28 is turned on as shown in FIG. At this time, when the load pan 11 is placed on the infrared sensor 16, the output of the infrared sensor 16 shows a low value of V0 because no light enters.
次に、加熱スイッチ２８をオンすると、発光手段１７が点灯する。この時は２段階の加熱操作の１段階目であるため、加熱動作は開始していない。発光手段１７が点灯すると光が導光手段１８を通って、トッププレート１２の赤外線センサ１６で検知できる領域が光る。発光手段１７の光はトッププレート１２面を照射するとともに、赤外線センサ１６にも入射される。本例では赤色の発光ダイオードを使用しているため、赤外線センサ１６の感度波長域の光が赤外線センサ１６に入射されるので、赤外線センサ１６の出力は赤外線センサ１６の異常検知のしきい値Ｖより高いＶ１まで上昇する。異常検知のしきい値Ｖは赤外線センサ１６で温度制御する制御温度Ｔ１の出力より高く設定しておくと、発光手段１７点灯時に赤外線センサ１６での制御範囲で異常なく出力可能であることが確認できる。 Next, when the heating switch 28 is turned on, the light emitting means 17 is turned on. Since this is the first stage of the two-stage heating operation, the heating operation has not started. When the light emitting means 17 is turned on, the light passes through the light guiding means 18 and the area that can be detected by the infrared sensor 16 of the top plate 12 shines. The light from the light emitting means 17 irradiates the surface of the top plate 12 and enters the infrared sensor 16. In this example, since a red light emitting diode is used, light in the sensitivity wavelength range of the infrared sensor 16 is incident on the infrared sensor 16, so that the output of the infrared sensor 16 is an abnormality detection threshold V of the infrared sensor 16. Increase to higher V1. If the threshold value V for abnormality detection is set higher than the output of the control temperature T1, which is temperature controlled by the infrared sensor 16, it is confirmed that the abnormality can be output within the control range of the infrared sensor 16 when the light emitting means 17 is turned on. it can.
発光手段１７が点灯時に赤外線センサ１６の出力がしきい値Ｖより低い場合は、赤外線センサ１６の異常と判断して、インバータ回路２２の出力を停止、またはインバータ回路２２の最大出力を制限して、表示手段２１のデジタル表示部３０にエラー表示を行う。インバータ回路２２の出力を停止する場合は、発光手段１７の点灯を継続させておくと、さらに赤外線センサ１６の異常状態がわかりやすくなる。 If the output of the infrared sensor 16 is lower than the threshold value V when the light emitting means 17 is lit, it is determined that the infrared sensor 16 is abnormal and the output of the inverter circuit 22 is stopped or the maximum output of the inverter circuit 22 is limited. Then, an error is displayed on the digital display section 30 of the display means 21. When the output of the inverter circuit 22 is stopped, if the lighting of the light emitting means 17 is continued, the abnormal state of the infrared sensor 16 becomes easier to understand.
なお、赤外線センサ１６の異常検知のしきい値は図４に示すように絶対値ではなく、図５に示すように、発光手段１７点灯時と消灯時の差△Ｖが所定値より低い場合に異常と判定すると、負荷鍋１１の初期温度の影響や、太陽光や照明光の影響を受けることなく、異常を判定することができる。 The abnormality detection threshold value of the infrared sensor 16 is not an absolute value as shown in FIG. 4, but when the difference ΔV between when the light emitting means 17 is turned on and when it is turned off is lower than a predetermined value as shown in FIG. If it determines with abnormality, abnormality can be determined, without receiving the influence of the initial temperature of the load pan 11, sunlight, or the influence of illumination light.
次に、切入スイッチ２９をオンすると加熱動作が開始し、約１秒後に発光手段１７が消灯する。赤外線センサ１６の出力は発光手段１７が消灯するとＶ０まで低下し、その後負荷鍋１１から出力された赤外線放射で温度を算出し、制御温度Ｔ１以上になるとインバータ回路２２の出力を低下させて加熱動作を停止する。 Next, when the cut-in switch 29 is turned on, the heating operation starts, and the light emitting means 17 is turned off after about 1 second. The output of the infrared sensor 16 is reduced to V0 when the light emitting means 17 is turned off, and then the temperature is calculated by the infrared radiation output from the load pan 11, and when the temperature becomes equal to or higher than the control temperature T1, the output of the inverter circuit 22 is reduced to perform heating operation. To stop.
トッププレート１２の上に負荷鍋１１が載置されていない場合や、加熱コイル１３に対して負荷鍋１１がずれておかれている場合は、インバータ回路２２の共振電圧が高くなるので、鍋検知手段２３で鍋なしと判定され、インバータ回路２２の出力を低下するとともに、発光手段１７を点灯させて、トッププレート１２の赤外線センサ１６で検知できる領域を光らせる。 When the load pan 11 is not placed on the top plate 12 or when the load pan 11 is shifted with respect to the heating coil 13, the resonance voltage of the inverter circuit 22 is increased, so that the pan detection is performed. The means 23 determines that there is no pan, lowers the output of the inverter circuit 22, turns on the light emitting means 17, and shines an area that can be detected by the infrared sensor 16 of the top plate 12.
赤外線センサ１６を加熱コイル１３のコイル間に配置する場合などは、加熱コイルの隙間が狭くなることがあるが、図３に示すように導光手段１８を下側が広くなるように傾斜を持たせることで、赤外線センサ１６および発光手段１７を小型化せずに実装することができる。特に、赤外線センサ１６の受感をよくするために導光手段１８の径の中心に赤外線センサ１６を配置する場合には、発光手段１７が導光手段１８の中心に対してずれた位置に配置されるので、導光手段１８の径が小さいと発光手段１７からの光が導光手段１８内に入射できないが、導光手段１８に傾斜部を設けることで、トッププレート１２上まで導光することができる。 When the infrared sensor 16 is disposed between the coils of the heating coil 13, the gap between the heating coils may be narrowed, but the light guide means 18 is inclined so that the lower side is wide as shown in FIG. Thus, the infrared sensor 16 and the light emitting means 17 can be mounted without being downsized. In particular, when the infrared sensor 16 is arranged at the center of the diameter of the light guide means 18 in order to improve the sensitivity of the infrared sensor 16, the light emitting means 17 is arranged at a position shifted from the center of the light guide means 18. Therefore, if the diameter of the light guide means 18 is small, the light from the light emitting means 17 cannot enter the light guide means 18, but the light guide means 18 is guided to the top plate 12 by providing an inclined portion. be able to.
なお、本実施の形態では赤外線センサ１６の異常検知のしきい値を、赤外線センサ１６の制御温度Ｔ１より高いレベルに設定したが、制御温度Ｔ１より低くても赤外線センサ１６が光に反応するのを判定することは可能であり、同様の効果を得ることができる。 In the present embodiment, the abnormality detection threshold of the infrared sensor 16 is set to a level higher than the control temperature T1 of the infrared sensor 16, but the infrared sensor 16 reacts to light even if the temperature is lower than the control temperature T1. Can be determined, and the same effect can be obtained.
また、発光手段１７を赤色の発光ダイオードで構成したが、赤外線センサ１６のチップ面積を大きくして感度を上げたり、温度算出手段１９で赤外線センサ１６の出力信号を増幅させることで、赤外線センサ１６の感度波長域での放射エネルギーが低くなる黄色や緑、青などの発光色を使用することも可能である。 Although the light emitting means 17 is composed of a red light emitting diode, the sensitivity of the infrared sensor 16 is increased to increase the sensitivity, or the temperature calculation means 19 amplifies the output signal of the infrared sensor 16 so that the infrared sensor 16 is amplified. It is also possible to use luminescent colors such as yellow, green, and blue that reduce the radiant energy in the sensitivity wavelength region.
また、赤外線センサ１６を加熱コイル１３のコイル間ではなく、コイル中央部分に配置しても同様の効果がえられる。 Further, the same effect can be obtained even if the infrared sensor 16 is arranged not in the middle of the heating coil 13 but in the central part of the coil.
また、発光手段１７の点灯時は、点滅状態としても同様の効果が得られる。 Further, when the light emitting means 17 is turned on, the same effect can be obtained even in a blinking state.
また、加熱スイッチ２８をオンする前は発光手段１７を消灯としていたが、点灯としていても同様の効果が得られる。 Further, the light emitting means 17 is turned off before the heating switch 28 is turned on, but the same effect can be obtained even if the light emitting means 17 is turned on.
また、加熱開始の２段階操作を加熱スイッチ２８＋切入スイッチ２９と構成したが、加熱スイッチ２８＋アップスイッチ２７またはダウンスイッチ２６の２段階で加熱してもよい。 In addition, although the two-stage operation for starting heating is configured as the heating switch 28 + the cut-in switch 29, the heating may be performed in two stages of the heating switch 28 + the up switch 27 or the down switch 26.
また、発光手段１７は加熱開始後約１秒後に消灯としたが、赤外線センサ１６による温度制御に影響がない範囲であれば、消灯タイミングを変更することは可能であり、逆に加熱開始後すぐに発光手段１７を消灯してもかまわない。 Further, the light emitting means 17 is turned off about 1 second after the start of heating. However, it is possible to change the turn-off timing as long as the temperature control by the infrared sensor 16 is not affected. Alternatively, the light emitting means 17 may be turned off.
以上のように、本実施の形態においては赤外線センサ１６近傍に発光手段１７をトッププレート１２の方向に向けて配置するので、トッププレート１２上の赤外線センサ１６受光領域を点灯することができる。 As described above, in the present embodiment, since the light emitting means 17 is disposed in the vicinity of the infrared sensor 16 in the direction of the top plate 12, the light receiving area of the infrared sensor 16 on the top plate 12 can be turned on.
また、発光手段１７点灯時に赤外線センサ１６の出力が所定以下でインバータ回路２２の出力を低下させるので、赤外線センサ１６の異常を加熱前に検知することが可能となる。 Further, since the output of the infrared sensor 16 is lower than the predetermined value when the light emitting means 17 is turned on and the output of the inverter circuit 22 is reduced, an abnormality of the infrared sensor 16 can be detected before heating.
また、発光手段１７点灯時と消灯時の赤外線センサ１６出力の差が所定以下でインバータ回路２２の出力を低下させるので、確実に発光手段１７による赤外線センサ１６出力の変化を検知して、赤外線センサ１６の異常を加熱前に検知することが可能となる。 In addition, since the difference between the outputs of the infrared sensor 16 when the light emitting means 17 is turned on and off is less than a predetermined value, the output of the inverter circuit 22 is lowered. It is possible to detect 16 abnormalities before heating.
また、発光手段１７点灯時の赤外線センサ１６出力が、赤外線センサ１６で温度制御するレベルの出力より大きくすることで、赤外線センサ１６での温度制御範囲で確実に出力することが可能であることを検知することができる。 Further, when the output of the infrared sensor 16 when the light emitting means 17 is turned on is larger than the output of the level at which the temperature is controlled by the infrared sensor 16, it is possible to reliably output within the temperature control range of the infrared sensor 16. Can be detected.
また、トッププレート１２から赤外線センサ１６への導光と発光手段１７からトッププレート１２への導光を同じ導光手段１８で行うので、トッププレート１２上の赤外線センサ１６の受光領域を精度よく点灯することができる。 Further, since the same light guide means 18 performs light guide from the top plate 12 to the infrared sensor 16 and light guide from the light emitting means 17 to the top plate 12, the light receiving area of the infrared sensor 16 on the top plate 12 is lighted with high accuracy. can do.
また、導光手段１８の穴径を下側に広くなるように導光手段１８に傾斜を設けることで、加熱コイル１３の隙間が狭い場合でも、赤外線センサ１６および発光手段１７を小型化することなく、発光手段１７の光をトッププレート１２上まで導光することができる。 Further, by providing the light guide means 18 with an inclination so that the hole diameter of the light guide means 18 is widened downward, the infrared sensor 16 and the light emitting means 17 can be downsized even when the gap between the heating coils 13 is narrow. The light from the light emitting means 17 can be guided to the top plate 12.
また、プリント配線板３２に赤外線センサ１６と発光手段１７を実装することで、赤外線センサ１６と発光手段１７の実装状態をより安定させることができ、また、赤外線センサ１６と発光手段１７をひとつのユニットとすることで、制御手段２３への接続を簡素化することができる。 Also, by mounting the infrared sensor 16 and the light emitting means 17 on the printed wiring board 32, the mounting state of the infrared sensor 16 and the light emitting means 17 can be further stabilized, and the infrared sensor 16 and the light emitting means 17 can be combined into one. By using a unit, the connection to the control means 23 can be simplified.
また、発光手段１８を加熱時に消灯することにより、加熱中は発光手段１７からの影響を受けることなく赤外線センサ１６による負荷鍋１１の温度制御を精度よく行うことが可能となる。 Further, by turning off the light emitting means 18 during heating, it is possible to accurately control the temperature of the load pan 11 by the infrared sensor 16 without being affected by the light emitting means 17 during heating.
また、発光手段１７を加熱開始後所定時間点灯するので、加熱開始してから負荷鍋１１を置く場合にも、赤外線センサ１６の位置を認識しやすくできる。 Further, since the light emitting means 17 is lit for a predetermined time after the heating is started, the position of the infrared sensor 16 can be easily recognized even when the load pan 11 is placed after the heating is started.
また、発光手段１７は加熱操作手段２０の１段目の操作時に点灯し、加熱操作手段２０の２段目の操作時に消灯するので、使用者が加熱操作を開始した時のみ発光手段１７を点灯させることができ、不要に発光手段１７を点灯させて使用者が煩わしいと感じることを低減することができる。また、発光手段１７の点灯時間を最小限とすることができるので、経年変化による発光手段１７の照度低下を抑制することができる。 Further, since the light emitting means 17 is turned on when the heating operation means 20 is operated at the first stage and is turned off when the heating operation means 20 is operated at the second stage, the light emitting means 17 is turned on only when the user starts the heating operation. It is possible to reduce the feeling that the user feels troublesome by turning on the light emitting means 17 unnecessarily. Moreover, since the lighting time of the light emission means 17 can be minimized, the illumination intensity fall of the light emission means 17 by a secular change can be suppressed.
また、鍋検知手段２３で鍋なし判定された場合にも、発光手段１７を点灯するので、加熱開始後、トッププレート上に鍋が置かれていない状態において、赤外線センサ１６の位置を使用者に認識させることができる。 In addition, since the light emitting means 17 is turned on even when the pan detecting means 23 determines that there is no pan, the position of the infrared sensor 16 is indicated to the user in a state where no pan is placed on the top plate after the start of heating. Can be recognized.
また、赤外線センサ１６の異常を検知してインバータ回路２２の出力を制限する時に、表示手段２１でエラー表示をすることで、赤外線センサ１６が異常であることを使用者が容易に認識することができる。 Further, when the abnormality of the infrared sensor 16 is detected and the output of the inverter circuit 22 is restricted, an error is displayed on the display means 21 so that the user can easily recognize that the infrared sensor 16 is abnormal. it can.
以上のように、本発明にかかる誘導加熱調理器は、赤外線センサによる温度制御を確実に実行することができるので、赤外線センサを用いる加熱調理器等の用途にも適用できる。 As described above, the induction heating cooker according to the present invention can surely execute the temperature control by the infrared sensor, and thus can be applied to uses such as a heating cooker using the infrared sensor.
１３ 加熱コイル
１６ 赤外線センサ
１７ 発光手段
１８ 導光手段
１９ 温度算出手段
２０ 加熱操作手段
２１ 表示手段
２２ インバータ回路
２３ 鍋検知手段
２４ 制御手段
３１ 保持部材
３２ プリント配線板
DESCRIPTION OF SYMBOLS 13 Heating coil 16 Infrared sensor 17 Light emission means 18 Light guide means 19 Temperature calculation means 20 Heating operation means 21 Display means 22 Inverter circuit 23 Pot detection means 24 Control means 31 Holding member 32 Printed wiring board
Claims (11)
前記制御手段は前記加熱コイルによる加熱動作開始に先立ち前記発光手段を点灯もしくは点滅させるとともに、前記発光手段の点灯時における前記赤外線センサの出力が第１の所定値以下になると、前記インバータ回路の出力を制限する誘導加熱調理器。 A heating coil that heats the pan on the top plate, an inverter circuit that supplies a high-frequency current to the heating coil, an infrared sensor that is provided below the heating coil and detects infrared rays emitted from the pan, and the infrared sensor Temperature calculating means for calculating the pan temperature from the output , and a light emitting color such as yellow, green, or blue that is arranged near the infrared sensor and has a low radiant energy in the sensitivity wavelength region of the infrared sensor or on the top plate surface A light emitting means for irradiating the light, and a control means for controlling the output of the inverter circuit according to the output from the temperature calculating means,
The control means turns on or blinks the light emitting means prior to the start of the heating operation by the heating coil, and outputs the inverter circuit when the output of the infrared sensor when the light emitting means is turned on is below a first predetermined value. Limit induction heating cooker.
の誘導加熱調理器。 The induction heating cooking according to claim 4 or 5, comprising a holding member for holding the light guide means, and a printed wiring board for fixing the infrared sensor and the light emitting means, wherein the printed wiring board is held by the holding member. vessel.
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| JP7349169B2 (en) | 2021-04-26 | 2023-09-22 | ▲広▼州大学 | Architectural hardening materials and their manufacturing methods and applications |
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| JP5682456B2 (en) * | 2011-05-31 | 2015-03-11 | パナソニックＩｐマネジメント株式会社 | Induction heating cooker |
| DE202012003287U1 (en) | 2012-04-02 | 2013-07-05 | Electrolux Home Products Corporation N.V. | Hob with a plate and a light bulb |
| EP2648478B1 (en) * | 2012-04-02 | 2017-11-22 | Electrolux Home Products Corporation N.V. | An illumination device for a cooking zone element of a cooking hob covered by a transparent panel and a corresponding cooking zone element and cooking hob |
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| JP3990116B2 (en) * | 2001-03-29 | 2007-10-10 | 三菱電機株式会社 | Induction heating cooker |
| JP2002343545A (en) * | 2001-05-17 | 2002-11-29 | Hitachi Hometec Ltd | Induction heating cooker |
| JP3975865B2 (en) * | 2002-08-30 | 2007-09-12 | 松下電器産業株式会社 | Induction heating cooker |
| JP4228710B2 (en) * | 2003-02-05 | 2009-02-25 | パナソニック株式会社 | Induction heating cooker |
| JP4123036B2 (en) * | 2003-04-21 | 2008-07-23 | 松下電器産業株式会社 | Cooker |
| JP4125646B2 (en) * | 2003-07-04 | 2008-07-30 | 松下電器産業株式会社 | Induction heating device |
| JP2005149836A (en) * | 2003-11-13 | 2005-06-09 | Hitachi Hometec Ltd | Induction heating cooking device |
| JP4492135B2 (en) * | 2004-01-28 | 2010-06-30 | パナソニック株式会社 | Induction heating cooker |
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| JP7349169B2 (en) | 2021-04-26 | 2023-09-22 | ▲広▼州大学 | Architectural hardening materials and their manufacturing methods and applications |
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