JPH01105495A - Heated cooking utensil - Google Patents
Heated cooking utensilInfo
- Publication number
- JPH01105495A JPH01105495A JP26209987A JP26209987A JPH01105495A JP H01105495 A JPH01105495 A JP H01105495A JP 26209987 A JP26209987 A JP 26209987A JP 26209987 A JP26209987 A JP 26209987A JP H01105495 A JPH01105495 A JP H01105495A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- thermistor
- voltage
- divided
- resistor value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010411 cooking Methods 0.000 title description 3
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 101100298222 Caenorhabditis elegans pot-1 gene Proteins 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000015429 Mirabilis expansa Nutrition 0.000 description 1
- 244000294411 Mirabilis expansa Species 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 235000013536 miso Nutrition 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、サーミスタを用いて被加熱物の温度を検出す
る加熱調理器に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cooking device that detects the temperature of an object to be heated using a thermistor.
従来の技術
従来の加熱調理器では鍋等の被加熱物の温度を検知する
手段として、安価で取扱い性の良いサーミスタが使用さ
れることが多い。そして、サーミスタの温度を電圧に変
換させ、サーミスタと抵抗の分圧電圧値の変化を読みと
シ、所定の電圧に保２・＼−１
たれるように、鍋への火力を制御するものである。2. Description of the Related Art In conventional heating cookers, a thermistor, which is inexpensive and easy to handle, is often used as a means for detecting the temperature of an object to be heated, such as a pot. Then, it converts the temperature of the thermistor into voltage, reads the change in the partial voltage value between the thermistor and the resistor, and controls the heat to the pot so that the voltage is maintained at a predetermined voltage. be.
発明が解決しようとする問題点
しかしながら、天ぷら料理では鍋内の油温を約１８０’
Ｃに保たせ、また鉄板焼料理等は約２５０°Ｃにも鉄板
温度が上昇する。一方、みそ汁等の保温では約８０°Ｃ
に温度設定を行うなど、このようにサーミスタの検知温
度が広範囲に及んでいる。Problems that the invention aims to solve However, when cooking tempura, the oil temperature in the pot must be set to about 180'.
The iron plate temperature rises to about 250°C for teppanyaki dishes. On the other hand, when keeping miso soup etc. warm, it is approximately 80°C.
Thermistors can detect a wide range of temperatures in this way, such as by setting the temperature.
また温度に対するサーミスタ抵抗値変化特性は、直線的
でなく指数関数的に変化するので検知温度範囲が広いと
すべての温度範囲において、単位温度当りの電圧変化分
が均一とならず、精度に大きなばらつきが生じてしまう
という問題点を有していた。In addition, the thermistor resistance value change characteristics with respect to temperature change not linearly but exponentially, so if the detection temperature range is wide, the voltage change per unit temperature will not be uniform over the entire temperature range, resulting in large variations in accuracy. This has the problem that this occurs.
本発明は上記問題点に鑑み、広範囲で、かつ、精度を高
く温度検知することを目的とする。In view of the above problems, it is an object of the present invention to detect temperature over a wide range and with high accuracy.
問題点を解決するだめの手段
上記目的を達成するため、本発明の加熱調理器はサーミ
スタと抵抗による分圧電圧によシ温度を検知し、かつ、
検知温度により抵抗値を切替える構成としている。Means for Solving the Problems In order to achieve the above object, the heating cooker of the present invention detects the temperature using a voltage divided by a thermistor and a resistor, and
The configuration is such that the resistance value is switched depending on the detected temperature.
３ページ
作用
上記構成によると、単位温度当シの分圧電圧変化分は、
その時のサーミスタの抵抗値と分圧抵抗値が同じ程度の
ときが大きく、双方の抵抗値の差が大きいと、その変化
分は小さくなる。Page 3 Effect According to the above configuration, the change in partial voltage per unit temperature is:
When the resistance value of the thermistor and the voltage dividing resistance value at that time are about the same, the change is large, and when the difference between the two resistance values is large, the change becomes small.
ある定められた抵抗値を持つ抵抗との分圧電圧が、サー
ミスタの温度に応じて変化していき、そのときの分圧電
圧が所定の電圧に達する（所定の温度に達する）と、分
圧抵抗値を変化させ、分圧電圧の変化率を常に同程度の
ものにして、広い温度範囲でもその検知精度を維持する
ことができる。The divided voltage with a resistor with a certain resistance value changes according to the temperature of the thermistor, and when the divided voltage reaches the specified voltage (reaches the specified temperature), the divided voltage changes depending on the temperature of the thermistor. By changing the resistance value and keeping the rate of change of the divided voltage always at the same level, detection accuracy can be maintained even over a wide temperature range.
実施例
本発明の一実施例における加熱−理容の構成を第２図お
よび第３図によシ説明する。図において、１は被加熱物
である鍋、２はトッププレート、３は外枠である。鍋１
の温度をトッププレート２を介して検知する温度センサ
４は、トッププレート２の裏面に接触させである。加熱
源である加熱コイル５はインバータ回路６に接続され、
このインバータ回路６には制御回路７によって高周波電
流が供給され、鍋１を加熱コイル６によシ誘導加熱させ
るものである。Embodiment The configuration of heating and hairdressing in an embodiment of the present invention will be explained with reference to FIGS. 2 and 3. In the figure, 1 is a pot which is an object to be heated, 2 is a top plate, and 3 is an outer frame. pot 1
A temperature sensor 4 that detects the temperature of the top plate 2 via the top plate 2 is in contact with the back surface of the top plate 2. A heating coil 5, which is a heating source, is connected to an inverter circuit 6,
A high frequency current is supplied to this inverter circuit 6 by a control circuit 7, and the pot 1 is heated by induction by the heating coil 6.
次に制御回路７の具体例を第１図によシ説明する。１１
は直流電源で、抵抗１２，１４．１６およびサーミスタ
４が接続されている。抵抗１４゜１６はスイッチング素
子１３．１５によシ直流電源１１と接続切替え可能な構
成としている。また、サーミスタ４の温度を検知するに
は、分圧電圧Ｖｉをマイコン２０内のム／Ｄ変換回路１
９を介し、アナログ信号をデジタル信号に変換するので
ある。Next, a specific example of the control circuit 7 will be explained with reference to FIG. 11
is a DC power supply to which resistors 12, 14, 16 and thermistor 4 are connected. The resistors 14 and 16 are configured to be able to be connected to the DC power source 11 by switching elements 13 and 15. In addition, in order to detect the temperature of the thermistor 4, the divided voltage Vi is applied to the MU/D conversion circuit 1 in the microcomputer 20.
9, the analog signal is converted into a digital signal.
なお、抵抗１７．１号はスイッチング素子１３゜１５駆
動用の抵抗である。そして、マイコン２゜の出カポ−）
Ｐｌが「Ｌ」レベルのときは、トランジスタ１３がオン
し、ま□た出カポ−）Ｐ２が１」レベルのときはトラン
ジスタ１６がオンする。Note that resistor No. 17.1 is a resistor for driving switching elements 13 and 15. And the output capo of the microcomputer 2°)
When Pl is at the "L" level, the transistor 13 is turned on, and when the output capacitor (P2) is at the "1" level, the transistor 16 is turned on.
すなわち、出カポ−）Ｐｌ、、Ｐ２がともにｒＨＪレベ
ルのときは、ｖｉ電圧は抵抗１２とサーミスタ４との分
圧電圧がム／Ｄ変換回路１９に入力される。次にポー）
ＰｌのみｒＬＪレベルのときは、抵抗１２．１４の並列
抵抗とサーミスタ４の分圧６ページ
電圧がム／Ｄ変換回路に入力されるわけである。That is, when the output capacitors Pl, P2 are both at the rHJ level, the vi voltage is a divided voltage between the resistor 12 and the thermistor 4 and is input to the M/D conversion circuit 19. Next Po)
When only Pl is at the rLJ level, the parallel resistances of resistors 12 and 14 and the divided 6 page voltage of thermistor 4 are input to the MU/D conversion circuit.
さらに、ポートＰ１．Ｐ２ともにｒＬＪレベルになると
、抵抗１２，１４．１６の並列抵抗とサーミスタ４との
分圧電圧が入力されることになる。Furthermore, port P1. When both P2 reach the rLJ level, the divided voltage of the thermistor 4 and the parallel resistances of the resistors 12 and 14.16 is input.
そしてム／Ｄ変換された信号がマイコン内で処理され、
マイコン２０内部で設定された温度レベルと比較し、設
定温度よシも検知温度が低いときは、マイコン２０の出
力Ｐ３よシ発振停止制御回路２１へ発振命令を出力し、
その逆のときは停止命令を出力する。The M/D converted signal is then processed within the microcontroller,
Compared with the temperature level set inside the microcomputer 20, if the detected temperature is lower than the set temperature, output P3 of the microcomputer 20 outputs an oscillation command to the oscillation stop control circuit 21,
In the opposite case, a stop command is output.
発振停止制御回路２１は、マイコン２ｏの出力Ｐ３の信
号に応じ、インバータ回路６を駆動し、加熱コイル６に
高周波電流を供給させるものである。The oscillation stop control circuit 21 drives the inverter circuit 6 in response to the signal of the output P3 of the microcomputer 2o, and supplies high frequency current to the heating coil 6.
第４図にサーミスタ４の温度と分圧電圧Ｖｉとの特性曲
線を示す。曲線人はマイコン２０の出カポ−）Ｐｌ 、
Ｐ２ともに「Ｈ」レベルのときの特性であり、曲線Ｂは
出カポ−）ＰｌがｒＬＪレベル、Ｐ２が「Ｈ」レベルの
ときのもので、曲線Ｃは、Ｐｌ、Ｐ２ともに「Ｌ」レベ
ルのときのもの６ヘーノ゛
である。FIG. 4 shows a characteristic curve of the temperature of the thermistor 4 and the divided voltage Vi. The curved person is the output capo of the microcomputer 20)Pl,
Curve B shows the characteristics when both P2 are at the "H" level. Curve B shows the characteristics when the output capo-Pl is at the rLJ level and P2 is at the "H" level. Curve C shows the characteristics when both P1 and P2 are at the "L" level. It was six days ago.
次に直線イはサーミスタ温度がＴ１よｆｉＴ２の間、曲
線人を近似し、直線口はサーミスタ温度がＴ２よシＴ３
の間、曲線Ｂを近似し、直線ノ・はサーミスタ温度がＴ
５よシＴ４の間、曲線Ｃを近似するものである。Next, the straight line A approximates the curve when the thermistor temperature is between T1 and fiT2, and the straight line is when the thermistor temperature is between T2 and T3.
During this period, curve B is approximated, and the straight line is the thermistor temperature T.
5 to T4, the curve C is approximated.
このように、サーミスタの温度範囲（Ｔ１〜Ｔ４）を、
３区分に分割し、１１〜７２間は直線イで決定される分
圧電圧ｖｉをム／Ｄ変換回路１９に入力し、７２〜７３
間は直線口で、７３〜７４間は直線ノーで決定されるｖ
ｉを入力する。そうすれば、サーミスタの単位温度当シ
の分圧電圧Ｖｉの変化率が、全温度範囲（Ｔ１〜Ｔ４
）に渡って、はぼ均一なものとなシその検知精度も向上
する。In this way, the temperature range (T1 to T4) of the thermistor is
It is divided into three sections, and between 11 and 72, the divided voltage vi determined by the straight line A is inputted to the MU/D conversion circuit 19, and between 72 and 73.
between is determined by a straight line, and between 73 and 74 is determined by a straight line no v
Enter i. By doing so, the rate of change of the partial voltage Vi per unit temperature of the thermistor can be adjusted over the entire temperature range (T1 to T4).
), the detection accuracy is also improved.
以上に述べた内容を、第４図に示すフローチャートを用
いて説明する。The contents described above will be explained using the flowchart shown in FIG.
分圧電圧Ｖｉをム／Ｄ変換するときは、まず初めにポー
）Ｐｌ 、Ｐ２をともに「Ｈ」レベルに設定し曲線Ａ上
に沿ってＶｉは変化するのであるが、このとき、
７ベーノ
（１） Ｖｉ≧Ｖ２ テあれば（−！；ｌ−−ミスタ
温度Ｔｈ≦Ｔ２）近似直線イに対応するＶｉ電圧をＡ／
Ｄ変換する。When performing Mu/D conversion on the divided voltage Vi, first both Pl and P2 are set to the "H" level, and Vi changes along the curve A. At this time, 7Ve( 1) If Vi≧V2 (-!; l--mister temperature Th≦T2), then convert the Vi voltage corresponding to the approximate straight line A to A/
D-convert.
（２） Ｖｉ＜ Ｖ２ テあれば（サーミスタ温度Ｔ
ｈ＞Ｔ２）ポートＰ１をｒＨＪレベルよ＃）ｒＬＪレベ
ルに切り替える。そうするとｖｉ は曲線Ｂ上に沿って
変化することになる。そしてこの状態で、（３） Ｖ
ｉ≧ｖ４テあれば（サーミスタ温度Ｔｈ≦Ｔ３）近似直
線口に対応するＶｉ電圧をム／Ｄ変換する。(2) If Vi < V2 (thermistor temperature T
h>T2) Switch port P1 from rHJ level to #) rLJ level. Then, vi will change along curve B. And in this state, (3) V
If i≧v4te (thermistor temperature Th≦T3), the voltage Vi corresponding to the approximate straight line is subjected to Mu/D conversion.
（４） Ｖｉ ＜ Ｖａ Ｔ：あれば（サーミスタ温
度Ｔｈ＞Ｔ３）ポートＰ１．Ｐ２双方をｒＬＪレベルに
切シ替えることにより Ｖｉは曲線Ｃ上に沿って変化す
る。このときは直線ハに対応するＶｉ電圧をＡ／Ｄ変換
する。(4) Vi < Va T: If (thermistor temperature Th>T3) port P1. Vi changes along curve C by switching both P2 to the rLJ level. At this time, the Vi voltage corresponding to straight line C is A/D converted.
このようにサーミスタ温度範囲（Ｔ１〜Ｔ４）内では、
その時々のサーミスタ温度を検知するには、３つの近似
直線のいずれかに対応したｖｉ電圧をＡ／Ｄ変換すれば
よく、出力ポートＰ１ 、Ｐ２の出力信号の組合せとＶ
ｉ電圧値とで、サーミスタ温度Ｔｈを１対１にデジタル
信号に変換することが可能となる。In this way, within the thermistor temperature range (T1 to T4),
To detect the thermistor temperature at any given time, it is sufficient to A/D convert the vi voltage corresponding to any of the three approximate straight lines, and the combination of the output signals of output ports P1 and P2 and the V
It becomes possible to convert the thermistor temperature Th into a digital signal on a one-to-one basis with the i voltage value.
発明の効果
以上、実施例から明らかなように本発明は、分圧抵抗値
を温度に応じて切替えるため、指数関数的に変化するサ
ーミスタを使用した場合にも、広い温度範囲内で常に一
定の精度を確保できるとともに、検知精度の向上をも実
現しうるものである。In addition to the effects of the invention, as is clear from the examples, the present invention switches the partial voltage resistance value according to the temperature, so even when using a thermistor that changes exponentially, it always maintains a constant value within a wide temperature range. In addition to ensuring accuracy, it is also possible to improve detection accuracy.
第１図は本発明の一実施例を示す加熱調理器の要部回路
図、第２図は同断面図、第３図は同外観斜視図、第４図
はサーミスタ温度と入力信号電圧との特性曲線図、第６
図は同制御を示すフローチャートである。
１・・・・・・鍋、２・・・・・・トッププレート、４
・・・・・・サーミスタ、７・・・・・・制御回路、１
２，１４．１６・・・・・・抵抗、１３．１５・・・・
・・スイッチング素子。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
４−一一アーミスタ
ｆ−１曲
２−１ツ７′プし−Ｌ
５□−加処唱ル
＆−−−イソノ（′−ダ回２谷、
第３図
第４図
第 ５ 図
スタート
ボー￥Ｐ１． Ｐ２
７．１てｒＨＪしＮル
ＲＪゐ。
Ｖｔ（２
不゛−νＰｔの升
１Ｌレヘ′ルド ・
１ Ｊる
しく４Ｎ
ど−卜Ｐ＋、Ｐ２八
Ｌヨレ’ｊ’ １１．／Ｌ（
■るFig. 1 is a circuit diagram of a main part of a heating cooker showing an embodiment of the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is an external perspective view of the same, and Fig. 4 is a diagram showing the relationship between the thermistor temperature and input signal voltage. Characteristic curve diagram, 6th
The figure is a flowchart showing the same control. 1...Pot, 2...Top plate, 4
...Thermistor, 7...Control circuit, 1
2, 14.16... Resistance, 13.15...
...Switching element. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 4-11 Armister f-1 song 2-1 7' push-L 5 □-additional chant &---Isono ('-da times 2 valleys, Figure 3 Figure 4 Figure 5 Start Bo\P1. P2 7.1 rHJ and N le RJ. L( ■ru
Claims (1)
知するサーミスタと、このサーミスタと抵抗の分圧電圧
を入力し、加熱部を制御して温度制御を行う制御回路を
備え、前記制御回路は検知温度に応じて前記抵抗の値を
切替え制御する構成とした加熱調理器。A heating section for heating an object to be heated, a thermistor for detecting the temperature of the object to be heated, and a control circuit for controlling the heating section and controlling the temperature by inputting the divided voltage of the thermistor and the resistor. The heating cooker is configured such that the control circuit switches and controls the value of the resistor according to the detected temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62262099A JPH0732070B2 (en) | 1987-10-16 | 1987-10-16 | Heating cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62262099A JPH0732070B2 (en) | 1987-10-16 | 1987-10-16 | Heating cooker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01105495A true JPH01105495A (en) | 1989-04-21 |
| JPH0732070B2 JPH0732070B2 (en) | 1995-04-10 |
Family
ID=17371023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62262099A Expired - Lifetime JPH0732070B2 (en) | 1987-10-16 | 1987-10-16 | Heating cooker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0732070B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007012431A (en) * | 2005-06-30 | 2007-01-18 | Toshiba Corp | Heating cooker |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59138820A (en) * | 1983-01-31 | 1984-08-09 | Sanyo Electric Co Ltd | Circuit for controlling temperature of oven |
| JPS59141909A (en) * | 1983-02-01 | 1984-08-14 | 三菱電機株式会社 | Rice cooker |
| JPS60239617A (en) * | 1984-05-15 | 1985-11-28 | Honda Motor Co Ltd | Signal input circuit |
-
1987
- 1987-10-16 JP JP62262099A patent/JPH0732070B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59138820A (en) * | 1983-01-31 | 1984-08-09 | Sanyo Electric Co Ltd | Circuit for controlling temperature of oven |
| JPS59141909A (en) * | 1983-02-01 | 1984-08-14 | 三菱電機株式会社 | Rice cooker |
| JPS60239617A (en) * | 1984-05-15 | 1985-11-28 | Honda Motor Co Ltd | Signal input circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007012431A (en) * | 2005-06-30 | 2007-01-18 | Toshiba Corp | Heating cooker |
| JP4664753B2 (en) * | 2005-06-30 | 2011-04-06 | 株式会社東芝 | Cooker |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0732070B2 (en) | 1995-04-10 |
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