JPH0350934B2 - - Google Patents
Info
- Publication number
- JPH0350934B2 JPH0350934B2 JP14513286A JP14513286A JPH0350934B2 JP H0350934 B2 JPH0350934 B2 JP H0350934B2 JP 14513286 A JP14513286 A JP 14513286A JP 14513286 A JP14513286 A JP 14513286A JP H0350934 B2 JPH0350934 B2 JP H0350934B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage comparator
- output
- electric heating
- relay
- heating element
- 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.)
- Expired
Links
- 238000005485 electric heating Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 11
- 230000010355 oscillation Effects 0.000 claims description 10
- 229910052754 neon Inorganic materials 0.000 claims description 7
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims description 7
- 238000010411 cooking Methods 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 230000004397 blinking Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Electric Stoves And Ranges (AREA)
- Cookers (AREA)
- Control Of Resistance Heating (AREA)
- Electric Ovens (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、電気発熱体を有する電気レンジな
どの加熱調理器具に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a heating cooking appliance such as an electric range having an electric heating element.
従来の技術
従来の電気レンジは、電気発熱体のみからなつ
ているものが主であるが、近年、温度過昇防止装
置が安全装置として備わつているものが現われ始
めた。これらの構成は、たとえば、第３図に示す
ような構成になつている。BACKGROUND OF THE INVENTION Conventional electric ranges have mainly consisted of only electric heating elements, but in recent years, some have begun to appear that are equipped with overtemperature rise prevention devices as a safety device. These structures are, for example, as shown in FIG.
すなわち電気発熱体１に直列にリレー接点２を
接続し、リレー駆動回路３は、電圧比較器４の出
力で制御されるようになつており電圧比較器４
は、負特性サーミスタよりなる温度検出素子５よ
りの信号を入力としている。なお表示素子として
はネオン管６が備えられている。 That is, a relay contact 2 is connected in series to an electric heating element 1, and a relay drive circuit 3 is controlled by the output of a voltage comparator 4.
inputs a signal from a temperature detection element 5 made of a negative characteristic thermistor. Note that a neon tube 6 is provided as a display element.
この構成により、負特性サーミスタよりなる温
度検出素子５が異常温度を検出し、電圧比較器４
において基準電圧との電圧比較により出力してリ
レー駆動回路３を禁止してリレー接点２を開き、
電気発熱体１への通電を停止し、異常温度時の安
全性を確保しようとするものである。 With this configuration, the temperature detection element 5 made of a negative characteristic thermistor detects an abnormal temperature, and the voltage comparator 4
output by comparing the voltage with the reference voltage to inhibit the relay drive circuit 3 and open the relay contact 2,
The purpose is to stop the power supply to the electric heating element 1 to ensure safety at abnormal temperatures.
発明が解決しようとする問題点
しかし、前記の構成では異常温度の検出を負特
性サーミスタにて行つているため、サーミスタを
含む回路が断線または接触不良となつた場合に
は、負特性サーミスタの抵抗が異常温度になつて
も電圧比較器を正常に動作させることができなく
なる。Problems to be Solved by the Invention However, in the above configuration, abnormal temperature is detected using a negative temperature thermistor, so if the circuit including the thermistor becomes disconnected or has a poor contact, the resistance of the negative temperature thermistor Even if the voltage reaches an abnormal temperature, the voltage comparator cannot operate normally.
そこで本発明では、サーミスタ回路の断線、接
触不良などの抵抗が大となつたときでも通電を停
止して、発光表示装置により点滅表示するなどし
て使用者に異常の発生を知らせることのできる調
理器の安全装置を提供するものである。 Therefore, in the present invention, even if the thermistor circuit is disconnected or the resistance becomes large due to poor contact, the power supply is stopped and the light-emitting display device blinks to notify the user of the occurrence of an abnormality. This provides a safety device for the equipment.
問題点を解決するための手段
前記問題点を解決する本発明の技術的手段は温
度検出素子の抵抗値が第１の電圧比較器の設定値
より小となるか、第２の電圧比較器の設定値より
大となつた場合、前記電圧比較器が動作してリレ
ー駆動回路を禁止してリレー接点を開き、電気発
熱体の通電を停止するとともに、発光表示装置を
低周波発振回路の出力で点滅駆動するように構成
したものである。Means for Solving the Problems The technical means of the present invention for solving the above problems is when the resistance value of the temperature detection element becomes smaller than the set value of the first voltage comparator or when the resistance value of the temperature detection element becomes smaller than the set value of the second voltage comparator. If the voltage exceeds the set value, the voltage comparator operates to disable the relay drive circuit, open the relay contacts, stop energizing the electric heating element, and turn the light emitting display device on with the output of the low frequency oscillation circuit. It is configured to be driven in blinking mode.
作 用 この技術的手段の作用は次のようになる。Effect The effect of this technical means is as follows.
すなわち、異常温度が発生して負特性サーミス
タの抵抗値が所定の値以下となつた場合、あるい
は、サーミスタ回路の断線、接触不良、接続忘れ
などで、抵抗値が所定の値以上となつた場合、そ
れぞれ、第１と第２の電圧比較器が動作してリレ
ー駆動回路を禁止して電気発熱体への通電を停止
し、同時に低周波発振器の出力で発光表示装置を
点滅駆動する。したがつて、使用者に異常の発生
を知らせることができ、すえつけ工事などで配線
の接続忘れなどを未然に防止することができるよ
うになり、安全性が高まる。 In other words, when an abnormal temperature occurs and the resistance value of the negative characteristic thermistor falls below the predetermined value, or when the resistance value rises above the predetermined value due to disconnection, poor contact, or forgotten connection in the thermistor circuit. , respectively, operate the first and second voltage comparators to inhibit the relay drive circuit to stop energizing the electric heating element, and at the same time drive the light emitting display device to blink with the output of the low frequency oscillator. Therefore, the user can be notified of the occurrence of an abnormality, and it is possible to prevent forgetting to connect wiring during installation work, etc., thereby increasing safety.
実施例
以下、電気レンジに使用した本発明の一実施例
を添付図面にもとづいて説明する。第１図におい
て、７は負特性サーミスタなどの温度検出素子で
あり、その信号は第１、第２の電圧比較器８，９
にそれぞれ与えられるようになつている。前記第
１、第２の電圧比較器８と９の出力は高レベルま
たは低レベルの２つのいずれかとなるようにして
いる。この第１、第２の電圧比較器８，９の出力
はリレー駆動回路１０に与えられリレーコイル１
１を介してリレーの接点１２を開閉するようにな
つている。Embodiment Hereinafter, an embodiment of the present invention used in an electric range will be described based on the accompanying drawings. In FIG. 1, 7 is a temperature detection element such as a negative characteristic thermistor, and its signal is sent to first and second voltage comparators 8 and 9.
They are now being given to each of them. The outputs of the first and second voltage comparators 8 and 9 are set to either a high level or a low level. The outputs of the first and second voltage comparators 8 and 9 are given to a relay drive circuit 10 and relay coil 1
1 to open and close the relay contacts 12.
また、第２の電圧比較器９の出力は低周波発振
回路１３に与えられ、低周波発振回路１３の出力
は光結合器の１次側１４より光結合器の２次側１
５を介してネオン管等の発光表示装置１６に与え
られている。電気発熱体１７の通電回路１７には
前記リレー接点１２および電源スイツチ１８−
ａ，１８−ｂが挿入され、また発光表示装置１６
の通電回路には電源スイツチ１８−ｃが挿入され
ている。 Further, the output of the second voltage comparator 9 is given to a low frequency oscillation circuit 13, and the output of the low frequency oscillation circuit 13 is transmitted from the primary side 14 of the optical coupler to the secondary side 14 of the optical coupler.
5 to a light emitting display device 16 such as a neon tube. The energizing circuit 17 of the electric heating element 17 includes the relay contact 12 and the power switch 18-.
a, 18-b are inserted, and the light emitting display device 16
A power switch 18-c is inserted into the energizing circuit.
上記構成において、通常の使用状態で電源スイ
ツチ１８が投入されるとリレー接点１２は閉状態
にあり、電気発熱体１７に通電する。 In the above configuration, when the power switch 18 is turned on in normal use, the relay contact 12 is in a closed state and the electric heating element 17 is energized.
次に、電気発熱体１７に通電中何らかの原因に
より異常温度になると温度検出素子７の抵抗値に
より第１、第２の電圧比較器８または９が作動
し、リレー駆動回路１０を禁止する。したがつて
接点１２は開き電気発熱体１７への通電は停止さ
れる。 Next, when the electric heating element 17 becomes abnormally temperature for some reason while being energized, the resistance value of the temperature detection element 7 activates the first and second voltage comparators 8 or 9 and inhibits the relay drive circuit 10. Therefore, the contact point 12 is opened and the current supply to the electric heating element 17 is stopped.
一方、低周波発振回路１３の出力は解除され、
光結合器１４および１５を介して発光表示装置１
６を点滅させる。発光表示装置１６の点滅により
使用者は異常温度を知ることができるのである。
なお第１図中の１９は電源回路を示している。 On the other hand, the output of the low frequency oscillation circuit 13 is canceled,
Light emitting display device 1 via optical couplers 14 and 15
6 flashes. The user can know the abnormal temperature by blinking the light emitting display device 16.
Note that 19 in FIG. 1 indicates a power supply circuit.
第２図には、本発明の一実施例を示す電気回路
図である。 FIG. 2 is an electrical circuit diagram showing one embodiment of the present invention.
温度検出素子７に並列に抵抗器２０、直列に抵
抗器２１と２２を接続し、その接続点を第１、第
２の電圧比較器８，９の入力端子および入力
端子に接続する。抵抗２３と２４とは、第２の電
圧比較器９の基準電圧を発生する。同様に抵抗器
２５、半固定抵抗器２６と抵抗器２７は第１の電
圧比較器８の基準電圧を発生する。また、抵抗器
２８とダイオード２９は第１の電圧比較器８が動
作したときにヒステリシスを発生させるための帰
還ループである。同様に抵抗器３０は第２の電圧
比較器９のヒステリシス発生のための帰還ループ
である。 A resistor 20 is connected in parallel to the temperature detection element 7, and resistors 21 and 22 are connected in series, and their connection points are connected to the input terminals and input terminals of the first and second voltage comparators 8 and 9. Resistors 23 and 24 generate a reference voltage for the second voltage comparator 9. Similarly, resistor 25, semi-fixed resistor 26 and resistor 27 generate a reference voltage for first voltage comparator 8. Further, the resistor 28 and the diode 29 are a feedback loop for generating hysteresis when the first voltage comparator 8 operates. Similarly, resistor 30 is a feedback loop for generating hysteresis in second voltage comparator 9.
第１の電圧比較器８は負特性サーミスタ７の抵
抗値が小となつたとき、すなわち高温側で出力が
低レベルとなり、リレー駆動回路を構成するトラ
ンジスタ１０を禁止しリレー接点１２が開く。 When the resistance value of the negative characteristic thermistor 7 becomes small, that is, on the high temperature side, the first voltage comparator 8 outputs a low level, inhibits the transistor 10 forming the relay drive circuit, and opens the relay contact 12.
第２の電圧比較器９は負特性サーミスタ７抵抗
値が大となつたとき、すなわち低温または、サー
ミスタ７の断線故障時などに出力が低レベルとな
り、同様に接点１２が開く。 The second voltage comparator 9 outputs a low level when the resistance value of the negative characteristic thermistor 7 becomes large, that is, at low temperatures or when the thermistor 7 has a disconnection failure, and the contact 12 similarly opens.
以上のようにして、負特性サーミスタ７により
異常温度となつた場合にリレー接点１２を開いて
電気発熱体１７への通電が停止される。 As described above, when an abnormal temperature is detected by the negative characteristic thermistor 7, the relay contact 12 is opened to stop energizing the electric heating element 17.
また、正常使用中はリレー駆動回路を構成する
トランジスタ１０が導通しているためダイオード
２８を介して光結合器の１次側の発光ダイオード
１４に通電され、２次側のトライアツク１５が駆
動されてネオン管１６が点灯状態にあつたが、異
常温度となるとトランジスタ１０がオフとなる
と、低周波発振回路１３の発生する周期で発光ダ
イオード１４が通電され、したがつて２次側のト
ライアツク１５もその周期でオンオフするので、
低周波発振回路１３の発生する周期で、ネオン管
１６は点滅することとなる。 Also, during normal use, the transistor 10 constituting the relay drive circuit is conductive, so power is supplied to the light emitting diode 14 on the primary side of the optical coupler through the diode 28, and the triac 15 on the secondary side is driven. The neon tube 16 was in the lighting state, but when the temperature becomes abnormal and the transistor 10 is turned off, the light emitting diode 14 is energized at the cycle generated by the low frequency oscillation circuit 13, and therefore the triac 15 on the secondary side is also turned off. It turns on and off periodically, so
The neon tube 16 will blink at the frequency generated by the low frequency oscillation circuit 13.
抵抗２９は、トライアツクの洩れ電流が増大し
ても、ネオン管１６が点灯するのを未然に防止す
るためのバイパス抵抗器３０，３１は限流用の抵
抗器である。 The resistor 29 is used to prevent the neon tube 16 from lighting up even if the leakage current of the triac increases.The bypass resistors 30 and 31 are current-limiting resistors.
なお、本実施例では、発光表示装置としてネオ
ン管を用いているが、発光ダイオード・ランプな
どを用いても同様の結果を得る。 In this embodiment, a neon tube is used as the light-emitting display device, but similar results can be obtained by using a light-emitting diode lamp or the like.
発明の効果
以上の実施例の説明より明らかなように本発明
の調理器の安全装置は第１、第２の電圧比較器を
用い、負特性サーミスタの断線・接触不良・接続
忘れなどがあつたときには、通電を停止し発光表
示装置が点滅表示するので、安全装置が異常温度
になつても安全装置不動作となることを防止で
き、安全装置の信頼性を高めることができるもの
である。Effects of the Invention As is clear from the description of the embodiments above, the safety device for the cooker of the present invention uses the first and second voltage comparators, and prevents disconnection, poor contact, or forgotten connection of the negative characteristic thermistor. At times, the power supply is stopped and the light-emitting display flashes, so even if the safety device reaches an abnormal temperature, the safety device can be prevented from becoming inoperable, and the reliability of the safety device can be improved.
第１図は本発明の一実施例の調理器の安全装置
を示すブロツク図、第２図は同回路図、第３図は
従来の安全装置のブロツク図である。
７……温度検出素子、８……第１の電圧比較
器、９……第２の電圧比較器、１０……リレー駆
動回路、１２……リレー接点、１３……低周波発
振回路、１６……発光表示装置、１７……電気発
熱体。
FIG. 1 is a block diagram showing a safety device for a cooking appliance according to an embodiment of the present invention, FIG. 2 is a circuit diagram of the same, and FIG. 3 is a block diagram of a conventional safety device. 7... Temperature detection element, 8... First voltage comparator, 9... Second voltage comparator, 10... Relay drive circuit, 12... Relay contact, 13... Low frequency oscillation circuit, 16... ...Light-emitting display device, 17...Electric heating element.
Claims (1)
において負特性サーミスタなどの温度検出素子
と、前記温度検出素子の信号を受ける第１の電圧
比較器および第２の電圧比較器と、前記第１、第
２の電圧比較器の出力で制御されるリレー駆動回
路と、電気発熱体と直列に接続された前記リレー
駆動回路のリレー接点と、電圧比較器の出力を受
ける低周波発振回路と、低周波発振回路の出力で
駆動されるネオン管などの発光表示装置とを有
し、温度検出素子の抵抗値が第１の電圧比較器の
設定値より小となるか第２の電圧比較器の設定値
より大となつた場合、前記電圧比較器が動作して
リレー駆動回路を禁止してリレー接点を開き電気
発熱体の通電を停止するとともに、発光表示装置
を低周波発振回路の出力で点滅駆動するように構
成したことを特徴とする調理器の安全装置。1. In a cooking appliance such as an electric range having an electric heating element, a temperature detection element such as a negative characteristic thermistor, a first voltage comparator and a second voltage comparator that receive a signal from the temperature detection element, and the first, a relay drive circuit controlled by the output of the second voltage comparator; a relay contact of the relay drive circuit connected in series with an electric heating element; a low frequency oscillation circuit receiving the output of the voltage comparator; It has a light emitting display device such as a neon tube driven by the output of an oscillation circuit, and determines whether the resistance value of the temperature detection element is smaller than the set value of the first voltage comparator or the set value of the second voltage comparator. If the voltage becomes larger than that, the voltage comparator operates to disable the relay drive circuit, open the relay contacts, stop energizing the electric heating element, and drive the light emitting display device to blink with the output of the low frequency oscillation circuit. A safety device for a cooker characterized by being configured as follows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61145132A JPS62299623A (en) | 1986-06-20 | 1986-06-20 | cooker safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61145132A JPS62299623A (en) | 1986-06-20 | 1986-06-20 | cooker safety device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62299623A JPS62299623A (en) | 1987-12-26 |
| JPH0350934B2 true JPH0350934B2 (en) | 1991-08-05 |
Family
ID=15378146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61145132A Granted JPS62299623A (en) | 1986-06-20 | 1986-06-20 | cooker safety device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62299623A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0614684Y2 (en) * | 1988-06-08 | 1994-04-20 | 東芝ホームテクノ株式会社 | Heating cooker |
| JPH077874Y2 (en) * | 1990-05-31 | 1995-03-01 | リンナイ株式会社 | Heating cooker |
-
1986
- 1986-06-20 JP JP61145132A patent/JPS62299623A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62299623A (en) | 1987-12-26 |
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