JP4121421B2

JP4121421B2 - Electromagnetic cooker

Info

Publication number: JP4121421B2
Application number: JP2003165404A
Authority: JP
Inventors: 正巳明里; 拓雄大原; 光章田渕; 俊也西本
Original assignee: Sanyo Electric Co Ltd; Tega Sanyo Industry Co Ltd
Current assignee: Sanyo Electric Co Ltd; Sanyo Techno Solutions Tottori Co Ltd
Priority date: 2003-06-10
Filing date: 2003-06-10
Publication date: 2008-07-23
Anticipated expiration: 2023-06-10
Also published as: JP2005005050A

Description

【０００１】
【発明の属する技術分野】
本発明は、誘導加熱コイルに高周波電力を供給することで、被調理物を加熱する電磁調理器に関する。
【０００２】
【従来の技術】
調理器本体の天面に耐熱性ガラス等で構成した天板を装着すると共に、この天板の下方に誘導加熱コイルを配設した電磁調理器では、誘導加熱コイルの自己発熱と負荷からの輻射熱による過熱を防止する為、常時冷却ファンにより冷却しているが、冷却ファンの故障等による異常過熱による断線等を防止する様に、温度センサにより誘導加熱コイルの温度を検出し、過熱時にはコイルへの電力供給を停止している。
【０００３】
一方、上記誘導加熱コイルの温度検出に際しては、例えば特許文献１に示される様に、複数の温度検出素子を用い、一方の温度検出素子にて負荷の温度を検出して加熱コイルの出力を制御し、他方の温度検出素子にて加熱コイルの温度を検出する様に構成したものがある。
【０００４】
【特許文献１】
特開２０００−２２３２５１号公報
【０００５】
【発明が解決しようとする課題】
一方、上記特許文献１の構成では、複数の温度検出素子の検出温度を個別に処理して制御を行っている為、配線処理や回路構成のコストが高価に成るという問題がある。
【０００６】
そこで本発明は、誘導加熱コイルの過熱を比較的簡単な構成にて確実に検出する事を目的とするものである。
【０００７】
【課題を解決するための手段】
本発明は、調理器本体と、この調理器本体内に配置された誘導加熱コイルと、この誘導加熱コイルにて加熱する負荷の温度を検出する負荷温度検出手段と、誘導加熱コイルの温度を検出するコイル温度検出手段と、これら検出手段の出力に基づいて誘導加熱コイルの電力を制御する制御回路とを備えたものにおいて、負荷温度検出手段にコイル温度検出手段と抵抗の直列回路を並列接続すると共に、このコイル温度検出手段を、誘導加熱コイルの温度が予め設定した設定温度以上に上昇すると接片を閉成する温度スイッチにて構成し、かつ抵抗の抵抗値を、コイル温度検出手段が接片を閉成した時には負荷温度検出手段との合成抵抗値が、予め設定した負荷の異常過熱値に相当する様に設定したものである。
【００１１】
そして更に本発明は、負荷温度検出手段をコネクタによりコイル温度検出手段に着脱自在に接続し、かつこのコイル温度検出手段をコネクタを介して制御回路に着脱自在に接続する様に構成したものである。
【００１２】
【発明の実施の形態】
本発明の実施例を、先ず図１に基づき説明すると、１は例えばシステムキッチン等にドロップイン方式にて組み込まれて使用される電磁調理器本体で、上面に耐熱ガラス製の天板２を装着していると共に、この天板の下方内部に熱源となる左右一対の誘導加熱コイル３，４とラジェントヒータ５を内蔵している。
【００１３】
一方、上記電磁調理器本体１内の前面右側には操作パネル６を配設していると共に、この操作パネルの左側にはグリル７用のグリル扉８を引き出し自在に配設し、かつ、上記操作パネル６には、シーソー式の電源スイッチ９、複数の液晶表示器１０・・、複数の操作摘み１１・・等を配設している。
【００１４】
又、上記電磁調理器本体１の内部には、図２にても示す様に上記グリル７の右側に位置して上記誘導加熱コイル３，４やラジェントヒータ５への通電を制御する複数の回路基板１２・・を配設していると共に、これら回路基板の後方に、冷却用空気を送風する冷却ファン１３を配設している。
【００１５】
更に上記誘導加熱コイル３，４は、図３にても示す様に、放射状に複数の支持片１４・・を一体成形した樹脂製のコイル台１５の上面にコイル線１６を一体的に装着していると共に、その中心部に上記天板２上に載置される調理鍋等の負荷の温度を検出するサーミスタ等の負荷温度検出手段１７を装着している。
【００１６】
又、上記コイル台１５には、図４にても示す様に、コイル線１６の温度上昇が比較的大きな、誘導加熱コイル３，４の半径方向の略中間位置の温度を検出する、バイメタルスイッチ等にて構成したコイル温度検出手段１８を装着している。
【００１７】
尚、上記実施例ではコイル温度検出手段１８の感温面１９とコイル線１６との間に僅かな間隙を設け、コイル台１５とコイル線１６の熱膨張係数の相違による摩擦の発生を防止し、摩擦によるコイル線１６の表面に形成した絶縁膜の剥離による絶縁不良等を防止する様に構成しているが、直接接触させて、コイル線１６の温度をコイル温度検出手段１８にて確実に検出する様に構成しても良い。
【００１８】
図５〜図７は本発明による制御回路２０の実施例を示すもので、図５は上記コイル温度検出手段１８を、コイル線１６の温度が予め設定した設定温度（例えば１２５℃）以上に上昇すると接片２１を開成する常閉型の温度スイッチにて構成すると共に、この温度スイッチを上記負荷温度検出手段１７に直列接続し、かつこれら直列回路の出力をマイクロコンピュータ等にて構成した制御部２２の入力ポート２３に接続している。
【００１９】
又、上記制御部２２は図示しないインバータ回路等を含み、上記負荷温度検出手段１７の検出温度に応じて誘導加熱コイル３，４への出力電力を制御し、負荷温度を設定温度に加熱制御し、かつ誘導加熱コイル３，４の出力が設定火力に成る様に制御を行う。
【００２０】
一方、何らかの原因によりコイル線１６の温度がコイル温度検出手段１８の設定温度以上に上昇して過熱した場合には、コイル温度検出手段１８の接片２１が開成して入力ポート２３の入力電圧が略基準電圧（Ｖｄｄ）と成る。
【００２１】
そこで、例えば図８にて示す様に、上記制御部２２の設定を、上記入力ポート２３の入力電圧が０Ｖ〜Ｖａの場合は負荷温度検出手段１７の短絡故障等の異常発生、或いは誘導加熱コイル３，４の異常過熱、Ｖａ〜Ｖｂの場合は負荷の異常過熱、Ｖｂ〜Ｖｃの場合は負荷の正常温度、Ｖｃ（例えば負荷温度が−２０℃に相当）〜Ｖｄｄの場合は上記負荷温度検出手段１７の断線故障等の異常発生と判断する様に構成し、上記コイル線１６の異常過熱により入力ポート２３の入力電圧が略基準電圧に達すると、制御部２２が異常発生と判断して誘導加熱コイル３，４への電力供給を停止する。
【００２２】
これらの構成により、制御部２２の設定を変更することなく、比較的簡単な構成にて、誘導加熱コイル３，４のコイル線１６が過熱時には、これを確実に検出して加熱調理を中断し、コイル線１６の異常過熱による断線や損傷、耐久性能の低下等を防止するものである。
【００２３】
上記図６は、コイル温度検出手段１８をコイル線１６の温度が上記設定温度以上に上昇すると接片２１を閉成する常開型の温度スイッチにて構成し、かつ負荷温度検出手段１７に並列接続したもので、何らかの原因によりコイル線１６の温度が設定温度以上に上昇すると、コイル温度検出手段１８の接片２１が閉じて負荷温度検出手段１７の両端を短絡し、上記入力ポート２３の入力電圧を０Ｖとすることで、制御部２２が異常発生を検出する様に構成している。
【００２４】
又、上記図７は上記コイル温度検出手段１８に等価抵抗２４を直列接続し、これらの直列回路を上記負荷温度検出手段１７に並列接続し、かつ、上記等価抵抗２４の抵抗値を、コイル温度検出手段１８の接片２１が閉じた時に、入力ポート２３の入力電圧がＶａ〜Ｖｂの範囲に成る様に設定したもので、これらの構成により、コイル線１６の温度が設定温度以上に上昇しても、先ず誘導加熱コイル３，４の火力を下げて加熱を継続させ、継続により更に温度が上昇して入力ポート２３の入力電圧がＶａ以下に低下した場合には、誘導加熱コイル３，４への電力供給を停止して加熱を停止し、火力ダウンによりコイル線１６の温度が低下すれば調理を継続する様に構成している。
【００２５】
これらの構成により、コイル線１６の温度が設定温度に上昇してコイル温度検出手段１８が作動しても調理を継続する事が出来、使い勝手を向上できるものである。
【００２６】
図９は本発明の他の実施例を示すもので、上記コイル温度検出手段１８と等価抵抗２４を直列接続すると共に、これら直列接続回路の両端に各々２端子タイプのコネクタ２５，２６の一方の端子を接続し、かつ上記コネクタの他方の端子同士を接続線２７にて接続し、一方のコネクタ２５を上記負荷温度検出手段１７の両端に接続したコネクタ２８に着脱自在に接続し、他方のコネクタ２６を上記入力ポート２３とグランドに接続したコネクタ２９に着脱自在に接続している。
【００２７】
これらの構成により、上記コイル温度検出手段１８を負荷温度検出手段１７と制御部２２との間に簡単に接続することが可能となり、従来の負荷温度検出手段１７や制御部２２の設定をそのまま利用して、比較的簡単にコイル線１６の温度上昇を確実に検出する事が出来るものである。又、何らかの理由により負荷温度検出手段１７、或いはコイル温度検出手段１８が故障しても、これらを簡単に個々に交換修理を行う事が出来るものである。
【００２８】
尚、上記実施例では、コイル温度検出手段１８の誘導加熱コイル３，４への取付けが必要となり、図３にて示す様にコイル台１５を新たに変更しても良いが、コイル台の加工によりコイル温度検出手段１８を固定する様に構成しても良く、この場合、コイル温度検出手段１８の追加によるコストアップを極力低減出来るものである。
【００２９】
又、上記図９にて示す実施例では、図７にて示す回路を例に説明したが、これに限定されることなく、図５及び図６にて示す実施例においても同様に構成する事ができるものである。
【００３０】
而して、加熱調理に際しては、調理鍋等の負荷を誘導加熱コイル３，４上方の天板２に載せ、電源スイッチ９をオン操作した後、操作摘み１１・・等を操作して火力や調理時間を設定することで、制御部２２がこれらの操作を検出して所定の電力を誘導加熱コイル３，４に供給して加熱を開始する。
【００３１】
又、上記加熱を開始すると、負荷温度検出手段１７にて常時負荷の温度を検出して誘導加熱コイル３，４の火力を調節する。
【００３２】
一方、何らかの原因により誘導加熱コイル３，４のコイル線１６の温度がコイル温度検出手段１８の設定温度以上に上昇すると、接片２１が開成又は閉成して負荷温度検出手段１７の出力信号を、負荷温度の正常温度範囲以外に変化させ、これにより、制御部２２はこれを検出して誘導加熱コイル３，４への電力供給を停止、或いは低減して誘導加熱コイル３，４の異常加熱による損傷を確実に防止するものである。
【００３３】
尚、上記誘導加熱コイル３，４への電力供給の停止等により誘導加熱コイル３，４の温度が低下すれば、接片２１が元の状態に閉成又は開成して通常加熱を行うものである。
【００３４】
更に、上記実施例ではコイル温度検出手段１８に自動復帰型のバイメタルスイッチを用いているが、これに限定されることなく、設定温度で急激に抵抗値が変化する素子等を用いても良い。
【００３５】
【発明の効果】
本発明の構成により、誘導加熱コイルの温度を検出するコイル温度検出手段を、コイルの温度が予め設定した設定温度以上に上昇すると、負荷の温度を検出する負荷温度検出手段の出力信号を変化させる様に構成したことで、従来のコイル温度検出手段を具備していない構成を利用して、比較的簡単な構成にて誘導加熱コイルの異常温度上昇を確実に検出する事が出来るものである。
【００３８】
更に本発明の構成により、負荷温度検出手段とコイル温度検出手段を並列接続すると共に、コイル温度検出手段を誘導加熱コイルの温度を設定温度以上に上昇すると接片を閉じる温度スイッチにて構成したものにおいて、コイル温度検出手段に抵抗を直列接続し、かつこの抵抗の抵抗値を、コイル温度検出手段が接片を閉じた時の負荷温度検出手段との合成抵抗値が負荷の異常高温値に相当する様に構成したことで、制御回路の設定を変更することなく、比較的簡単な構成にて誘導加熱コイルの異常温度上昇を確実に防止する事が出来るものである。
【００３９】
そして更に本発明の構成により、負荷温度検出手段をコネクタによりコイル温度検出手段に着脱自在に接続し、コイル温度検出手段をコネクタを介して制御回路に着脱自在に接続する様に構成したことで、コイル温度検出手段を負荷温度検出手段と制御部との間に簡単に接続することが可能となり、従来の負荷温度検出手段を具備した回路構成をそのまま利用し、比較的簡単な構成にて誘導加熱コイルの異常温度上昇による損傷を確実に防止する事が出来るものである。
【図面の簡単な説明】
【図１】本発明による実施例を示す斜視図である。
【図２】同じく一部の部品を取外した状態を示す斜視図である。
【図３】同じく誘導加熱コイルの背面斜視図である。
【図４】同じく誘導加熱コイルの側面縦断面図である。
【図５】同じく制御回路の実施例を示す回路図である。
【図６】同じく制御回路の他の実施例を示す回路図である。
【図７】同じく制御回路の他の実施例を示す回路図である。
【図８】同じく負荷温度と負荷温度検出手段の出力電圧との関係を示す特性図である。
【図９】同じく制御回路の他の実施例を示す回路図である。
【符号の説明】
１調理器本体
３誘導加熱コイル
４誘導加熱コイル
１７負荷温度検出手段
１８コイル温度検出手段
２１接片
２２制御回路
２４抵抗
２５コネクタ
２６コネクタ
２８コネクタ
２９コネクタ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic cooker that heats an object to be cooked by supplying high-frequency power to an induction heating coil.
[0002]
[Prior art]
In an electromagnetic cooker in which a top plate made of heat-resistant glass is mounted on the top of the cooker body and an induction heating coil is disposed below the top plate, self-heating of the induction heating coil and radiant heat from the load In order to prevent overheating due to cooling, the cooling fan is always cooled, but the temperature of the induction heating coil is detected by a temperature sensor to prevent disconnection due to abnormal overheating due to failure of the cooling fan, etc. The power supply of is stopped.
[0003]
On the other hand, when detecting the temperature of the induction heating coil, for example, as shown in Patent Document 1, a plurality of temperature detection elements are used, and the temperature of the load is detected by one temperature detection element to control the output of the heating coil. However, there is a configuration in which the temperature of the heating coil is detected by the other temperature detection element.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-223251
[Problems to be solved by the invention]
On the other hand, in the configuration of Patent Document 1, since the control is performed by individually processing the detected temperatures of the plurality of temperature detecting elements, there is a problem that the cost of wiring processing and circuit configuration becomes expensive.
[0006]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reliably detect overheating of an induction heating coil with a relatively simple configuration.
[0007]
[Means for Solving the Problems]
The present invention relates to a cooker body, an induction heating coil disposed in the cooker body, load temperature detecting means for detecting the temperature of a load heated by the induction heating coil, and detecting the temperature of the induction heating coil. And a control circuit for controlling the electric power of the induction heating coil based on the outputs of the detecting means, and a series circuit of the coil temperature detecting means and a resistor is connected in parallel to the load temperature detecting means. At the same time, this coil temperature detecting means is constituted by a temperature switch that closes the contact piece when the temperature of the induction heating coil rises above a preset temperature , and the resistance value of the resistor is connected to the coil temperature detecting means. the combined resistance value of the load temperature detecting means when closing the piece is obtained by setting as you correspond to abnormal overheating of the load set in advance.
[0011]
Further, the present invention is configured such that the load temperature detecting means is detachably connected to the coil temperature detecting means by a connector, and the coil temperature detecting means is detachably connected to the control circuit via the connector. .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described first with reference to FIG. 1. Reference numeral 1 denotes an electromagnetic cooker body which is used by being incorporated into a system kitchen or the like by a drop-in method, and a top plate 2 made of heat-resistant glass is mounted on the upper surface. In addition, a pair of left and right induction heating coils 3 and 4 and a radial heater 5 which are heat sources are built in the lower part of the top plate.
[0013]
On the other hand, an operation panel 6 is disposed on the right side of the front surface of the electromagnetic cooker body 1, and a grill door 8 for the grill 7 is disposed on the left side of the operation panel so as to be freely retractable. The operation panel 6 is provided with a seesaw type power switch 9, a plurality of liquid crystal displays 10..., A plurality of operation knobs 11.
[0014]
Further, in the electromagnetic cooker body 1, as shown also in FIG. 2, there are a plurality of pieces that are located on the right side of the grill 7 and control energization to the induction heating coils 3, 4 and the radial heater 5. The circuit boards 12 are arranged, and a cooling fan 13 for blowing cooling air is arranged behind the circuit boards.
[0015]
Further, as shown in FIG. 3, the induction heating coils 3 and 4 have a coil wire 16 integrally mounted on the upper surface of a resin coil base 15 formed by integrally forming a plurality of support pieces 14. In addition, load temperature detection means 17 such as a thermistor for detecting the temperature of a load such as a cooking pan placed on the top plate 2 is mounted at the center thereof.
[0016]
Further, as shown in FIG. 4, the coil base 15 has a bimetal switch for detecting the temperature at a substantially intermediate position in the radial direction of the induction heating coils 3 and 4 where the temperature rise of the coil wire 16 is relatively large. The coil temperature detection means 18 comprised by the above is mounted | worn.
[0017]
In the above embodiment, a slight gap is provided between the temperature sensing surface 19 of the coil temperature detecting means 18 and the coil wire 16 to prevent the occurrence of friction due to the difference in the coefficient of thermal expansion between the coil base 15 and the coil wire 16. Although it is configured so as to prevent insulation failure due to peeling of the insulating film formed on the surface of the coil wire 16 due to friction, the temperature of the coil wire 16 is reliably detected by the coil temperature detecting means 18 by direct contact. You may comprise so that it may detect.
[0018]
5 to 7 show an embodiment of the control circuit 20 according to the present invention. FIG. 5 shows that the temperature of the coil temperature detecting means 18 is raised to a preset temperature (for example, 125 ° C.) or higher. Then, a control unit comprising a normally closed temperature switch for opening the contact piece 21 and connecting the temperature switch in series to the load temperature detecting means 17 and the output of the series circuit constituted by a microcomputer or the like. 22 input ports 23 are connected.
[0019]
The control unit 22 includes an inverter circuit (not shown) and controls the output power to the induction heating coils 3 and 4 according to the detected temperature of the load temperature detecting means 17 and controls the load temperature to the set temperature. In addition, control is performed so that the output of the induction heating coils 3 and 4 becomes the set heating power.
[0020]
On the other hand, when the temperature of the coil wire 16 rises above the set temperature of the coil temperature detecting means 18 and overheats for some reason, the contact piece 21 of the coil temperature detecting means 18 is opened and the input voltage of the input port 23 is increased. The reference voltage (Vdd) is obtained.
[0021]
Therefore, for example, as shown in FIG. 8, when the control unit 22 is set, if the input voltage of the input port 23 is 0V to Va, an abnormality such as a short circuit failure of the load temperature detecting means 17, or an induction heating coil Abnormal overheating of 3 and 4, abnormal overheating of load in the case of Va to Vb, normal temperature of the load in the case of Vb to Vc, detection of the above load temperature in the case of Vc (for example, the load temperature corresponds to -20 ° C) It is configured to determine that an abnormality such as a disconnection failure of the means 17 has occurred, and when the input voltage of the input port 23 reaches a substantially reference voltage due to abnormal overheating of the coil wire 16, the control unit 22 determines that an abnormality has occurred and leads The power supply to the heating coils 3 and 4 is stopped.
[0022]
With these configurations, when the coil wires 16 of the induction heating coils 3 and 4 are overheated with a relatively simple configuration without changing the setting of the control unit 22, this is surely detected and heating cooking is interrupted. In this way, disconnection and damage due to abnormal overheating of the coil wire 16, deterioration of durability, and the like are prevented.
[0023]
In FIG. 6, the coil temperature detecting means 18 is constituted by a normally open type temperature switch that closes the contact piece 21 when the temperature of the coil wire 16 rises above the set temperature, and is parallel to the load temperature detecting means 17. When the temperature of the coil wire 16 rises above the set temperature for some reason, the contact piece 21 of the coil temperature detecting means 18 is closed and both ends of the load temperature detecting means 17 are short-circuited. By setting the voltage to 0V, the control unit 22 is configured to detect the occurrence of abnormality.
[0024]
In FIG. 7, the equivalent resistance 24 is connected in series to the coil temperature detecting means 18, these series circuits are connected in parallel to the load temperature detecting means 17, and the resistance value of the equivalent resistance 24 is expressed as the coil temperature. When the contact piece 21 of the detecting means 18 is closed, the input voltage of the input port 23 is set so as to be in the range of Va to Vb. With these configurations, the temperature of the coil wire 16 rises above the set temperature. However, first, the heating power of the induction heating coils 3 and 4 is lowered to continue heating, and when the temperature further rises due to the continuation and the input voltage of the input port 23 falls below Va, the induction heating coils 3 and 4 The heating is stopped by stopping the supply of power to the power source, and cooking is continued if the temperature of the coil wire 16 decreases due to the thermal power down.
[0025]
With these configurations, cooking can be continued even when the temperature of the coil wire 16 rises to the set temperature and the coil temperature detecting means 18 is activated, and usability can be improved.
[0026]
FIG. 9 shows another embodiment of the present invention. The coil temperature detecting means 18 and the equivalent resistor 24 are connected in series, and one end of each of the two-terminal type connectors 25 and 26 is connected to both ends of the series connection circuit. The other terminals of the connectors are connected to each other by a connection line 27, one connector 25 is detachably connected to connectors 28 connected to both ends of the load temperature detecting means 17, and the other connector is connected. 26 is detachably connected to the connector 29 connected to the input port 23 and the ground.
[0027]
With these configurations, the coil temperature detection means 18 can be easily connected between the load temperature detection means 17 and the control unit 22, and the settings of the conventional load temperature detection means 17 and the control unit 22 are used as they are. Thus, the temperature rise of the coil wire 16 can be reliably detected relatively easily. Further, even if the load temperature detecting means 17 or the coil temperature detecting means 18 breaks down for some reason, these can be easily replaced and repaired individually.
[0028]
In the above embodiment, it is necessary to attach the coil temperature detecting means 18 to the induction heating coils 3 and 4, and the coil base 15 may be newly changed as shown in FIG. In this case, the cost increase due to the addition of the coil temperature detecting means 18 can be reduced as much as possible.
[0029]
In the embodiment shown in FIG. 9, the circuit shown in FIG. 7 has been described as an example. However, the present invention is not limited to this, and the embodiment shown in FIGS. It is something that can be done.
[0030]
Thus, during cooking, a load such as a cooking pan is placed on the top plate 2 above the induction heating coils 3 and 4 and the power switch 9 is turned on. By setting the cooking time, the control unit 22 detects these operations and supplies predetermined power to the induction heating coils 3 and 4 to start heating.
[0031]
When the heating is started, the load temperature detecting means 17 detects the temperature of the load at all times and adjusts the heating power of the induction heating coils 3 and 4.
[0032]
On the other hand, when the temperature of the coil wire 16 of the induction heating coils 3 and 4 rises above the set temperature of the coil temperature detecting means 18 for some reason, the contact piece 21 is opened or closed and the output signal of the load temperature detecting means 17 is output. Then, the load temperature is changed outside the normal temperature range, whereby the control unit 22 detects this and stops or reduces the power supply to the induction heating coils 3 and 4 to abnormally heat the induction heating coils 3 and 4. This is to prevent damage caused by the damage.
[0033]
If the temperature of the induction heating coils 3 and 4 is lowered due to the power supply to the induction heating coils 3 and 4 being stopped, etc., the contact piece 21 is closed or opened in the original state to perform normal heating. is there.
[0034]
Furthermore, in the above embodiment, an automatic return type bimetal switch is used for the coil temperature detecting means 18, but the present invention is not limited to this, and an element whose resistance value changes rapidly at a set temperature may be used.
[0035]
【The invention's effect】
With the configuration of the present invention, when the coil temperature detecting means for detecting the temperature of the induction heating coil rises above a preset temperature, the output signal of the load temperature detecting means for detecting the load temperature is changed. With this configuration, it is possible to reliably detect an abnormal temperature rise of the induction heating coil with a relatively simple configuration using a configuration that does not include a conventional coil temperature detection means.
[0038]
Further, according to the configuration of the present invention, the load temperature detecting means and the coil temperature detecting means are connected in parallel, and the coil temperature detecting means is constituted by a temperature switch that closes the contact piece when the temperature of the induction heating coil rises above the set temperature. In this case, a resistance is connected in series to the coil temperature detection means, and the resistance value of this resistance is equivalent to the combined high resistance value with the load temperature detection means when the coil temperature detection means closes the contact piece. With this configuration, it is possible to reliably prevent an abnormal temperature increase of the induction heating coil with a relatively simple configuration without changing the setting of the control circuit.
[0039]
Further, according to the configuration of the present invention, the load temperature detection means is detachably connected to the coil temperature detection means by the connector, and the coil temperature detection means is detachably connected to the control circuit via the connector. The coil temperature detecting means can be easily connected between the load temperature detecting means and the control unit, and the circuit configuration provided with the conventional load temperature detecting means is used as it is, and induction heating is performed with a relatively simple configuration. It is possible to reliably prevent damage due to abnormal temperature rise of the coil.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment according to the present invention.
FIG. 2 is a perspective view showing a state in which some components are removed.
FIG. 3 is a rear perspective view of the induction heating coil.
FIG. 4 is a side longitudinal sectional view of the induction heating coil.
FIG. 5 is a circuit diagram showing another embodiment of the control circuit.
FIG. 6 is a circuit diagram showing another embodiment of the control circuit.
FIG. 7 is a circuit diagram showing another embodiment of the control circuit.
FIG. 8 is a characteristic diagram showing the relationship between the load temperature and the output voltage of the load temperature detecting means.
FIG. 9 is a circuit diagram showing another embodiment of the control circuit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cooker main body 3 Induction heating coil 4 Induction heating coil 17 Load temperature detection means 18 Coil temperature detection means 21 Contact piece 22 Control circuit 24 Resistance 25 Connector 26 Connector 28 Connector 29 Connector

Claims

Cooker body, induction heating coil disposed in the cooker body, load temperature detection means for detecting the temperature of the load heated by the induction heating coil, and coil temperature for detecting the temperature of the induction heating coil In addition to detecting means and a control circuit for controlling the power of the induction heating coil based on the outputs of the detecting means, a series circuit of the coil temperature detecting means and a resistor is connected in parallel to the load temperature detecting means. The coil temperature detecting means is constituted by a temperature switch that closes the contact piece when the temperature of the induction heating coil rises above a preset temperature , and the resistance value of the resistor is set as the coil temperature detecting means. electromagnetic cooker but the combined resistance value of the load temperature detecting means when closing the contact piece, characterized in that the set so you corresponding to abnormal overheating of the load set in advance

The load temperature detection means is detachably connected to the coil temperature detection means by a connector, and the coil temperature detection means is detachably connected to the control circuit via the connector. The electromagnetic cooker according to claim 1 .