JPH09210808A - Circuit for detecting temperature of burning device - Google Patents
Circuit for detecting temperature of burning deviceInfo
- Publication number
- JPH09210808A JPH09210808A JP4540396A JP4540396A JPH09210808A JP H09210808 A JPH09210808 A JP H09210808A JP 4540396 A JP4540396 A JP 4540396A JP 4540396 A JP4540396 A JP 4540396A JP H09210808 A JPH09210808 A JP H09210808A
- Authority
- JP
- Japan
- Prior art keywords
- thermistor
- temperature
- resistor
- fet
- voltage
- 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
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
- Control Of Combustion (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、サーミスタを用
いて広い範囲の温度を正確に検出し、自動消火温度及び
サーミスタの断線等を検出する燃焼器具の温度検出回路
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature detection circuit for a combustion instrument that accurately detects a wide range of temperatures using a thermistor and detects an automatic fire extinguishing temperature, a thermistor disconnection, and the like.
【０００２】[0002]
【従来の技術】燃焼器具においては、天ぷら火災防止の
ため、天ぷら鍋の温度が２５０℃に達すると自動消火す
るように設定したり、また、サーミスタが断線すると自
動消火するようにし安全性を図っている。サーミスタの
断線の検出はサーミスタ温度が冷凍食品が鍋に入れられ
た場合を考え、冷凍食品の温度でサーミスタが断線した
と判断しないように、判断基準を−２２℃とし、サーミ
スタ温度が−２２℃に低下するとサーミスタが断線した
と判断して自動消火するように設定している。したがっ
て、サーミスタで検出する温度は２５０℃〜−２２℃の
広い範囲に及び、サーミスタの抵抗値は数百Ω〜数百ｋ
Ωの範囲で変化することになる。それ故、この広い温度
範囲において、正確に温度を検出することが困難であっ
た。2. Description of the Related Art In order to prevent the fire of tempura, it is necessary to set fire extinguishers to automatically extinguish when the temperature of the frying pan reaches 250 ° C, and to prevent fire when the thermistor is broken. ing. For the detection of the thermistor disconnection, consider the case where the thermistor temperature is frozen food is put in a pan, and set the judgment standard to -22 ℃ so that the thermistor temperature does not determine that the thermistor is disconnected. When the temperature drops to 0, it is determined that the thermistor has broken and is set to automatically extinguish. Therefore, the temperature detected by the thermistor covers a wide range of 250 ° C to -22 ° C, and the resistance value of the thermistor is several hundred Ω to several hundred k.
It will change in the range of Ω. Therefore, it is difficult to detect the temperature accurately in this wide temperature range.
【０００３】そこで、従来の燃焼器具の温度検出回路
は、図９に示す様に、サーミスタＴＨ′に直列に抵抗Ｒ
1 ′を接続し電源電圧ＶDD′を分圧し、その分圧電圧Ｖ
1 ′を自動消火温度検出用のコンパレータＵ1 ′に入力
すると共に、電源電圧ＶDD′を抵抗Ｒ4 ′と抵抗Ｒ5 ′
で分圧した分圧電圧Ｖ3 ′を設定電圧としてコンパレー
タＵ1 ′に入力して、サーミスタ温度が２５０℃以下な
らＬｏ、以上ならＨｉを出力させ、これにより自動消火
温度に達しているか否かを判定できるようにし、また、
前記分圧電圧Ｖ1 ′を抵抗Ｒ2 ′と抵抗Ｒ3 ′により分
圧し、その分圧電圧Ｖ2 ′をサーミスタ断線検出用のコ
ンパレータＵ2 ′に入力すると共に、電源電圧ＶDD′を
抵抗Ｒ7 ′と半固定抵抗ＶＲ′からなる直列回路と、抵
抗Ｒ6 ′とで分圧し、その分圧電圧Ｖ4 ′を設定電圧と
してコンパレータＵ2 ′に入力し、サーミスタＴＨ′が
正常ならばＬｏ、サーミスタＴＨ′に断線異常があると
Ｈｉを出力させ、これによりサーミスタＴＨ′が断線し
ているか否かを判定できるようにしたものが提案されて
いる。Therefore, as shown in FIG. 9, a conventional temperature detecting circuit for a combustion appliance has a resistor R in series with a thermistor TH '.
1 'connecting the supply voltage V DD' dividing the, the divided voltage V
And inputs' a comparator U 1 for automatic fire extinguishing temperature detection '1,' resistance R 4 'power supply voltage V DD and the resistor R 5'
The divided voltage V 3 ′ divided by is input to the comparator U 1 ′ as a set voltage, and Lo is output when the thermistor temperature is 250 ° C. or lower, and Hi is output when the thermistor temperature is 250 ° C. or higher. To be able to judge
The divided voltage V 1 ′ is divided by a resistor R 2 ′ and a resistor R 3 ′, the divided voltage V 2 ′ is input to a comparator U 2 ′ for detecting thermistor disconnection, and the power supply voltage V DD ′ is resistor. The voltage is divided by a series circuit composed of R 7 ′ and a semi-fixed resistor VR ′ and a resistor R 6 ′, and the divided voltage V 4 ′ is input as a set voltage to the comparator U 2 ′, and if the thermistor TH ′ is normal, It has been proposed to output Hi when Lo and thermistor TH 'have a disconnection abnormality so that it can be determined whether or not the thermistor TH' is disconnected.
【０００４】[0004]
【発明が解決しようとする課題】従来の技術で述べたも
のは、自動消火温度（２５０℃）におけるサーミスタと
抵抗による分圧電圧Ｖ1 ′と、断線判断温度（−２２
℃）におけるサーミスタと抵抗による分圧電圧が、検出
したい温度近辺で大きく変化する様に抵抗Ｒ1 ′を決定
しているが、抵抗Ｒ1 ′の値が一定であり、高温（２５
０℃）におけるサーミスタ抵抗値と、低温（−２２℃）
におけるサーミスタ抵抗値との両方で必要な精度が得ら
れず、半固定抵抗ＶＲ′を設けて設定電圧を調節して一
定の精度を得るようにしているが、検出温度の広範囲
化、高精度化に充分対応することができないという問題
点があった。What has been described in the prior art is that the divided voltage V 1 ′ by the thermistor and the resistor at the automatic extinguishing temperature (250 ° C.) and the disconnection judgment temperature (-22
The divided voltage by the resistors and thermistor at ° C.) is 'has been determined, resistor R 1' resistor R 1 so as to vary greatly at a temperature near to be detected value of a constant, elevated temperature (25
Thermistor resistance value at 0 ℃ and low temperature (-22 ℃)
Since the required accuracy cannot be obtained with both the thermistor resistance value and the semi-fixed resistor VR 'is provided to adjust the set voltage to obtain a certain accuracy, the detection temperature is widened and the accuracy is improved. There was a problem that it was not possible to cope with.
【０００５】この発明は従来技術の有するこの様な問題
点に鑑み、サーミスタと抵抗とにより分圧電圧を得るた
めに接続する抵抗を複数設け、測定対象の温度に合せて
抵抗を切替え可能とし、測定しようとする温度近辺で分
圧電圧の変化を大きくしサーミスタの分解能を向上さ
せ、広い範囲の温度の検出精度を高くした温度検出回路
を提供することを目的とし、また、パルス制御方式の燃
焼制御装置に使用する場合は、パルス信号を利用して抵
抗を切替えできるようにし、低温側（サーミスタの断線
検出用）と高温側（自動消火温度検出用）の２種類の分
圧電圧を得られるようにし、低温側の設定電圧と高温側
の設定電圧とをそれぞれ比較することにより温度検出の
高精度化を図った燃焼器具の温度検出回路を提供するこ
とを目的としている。In view of such problems of the prior art, the present invention provides a plurality of resistors connected to obtain a divided voltage by a thermistor and a resistor, and makes it possible to switch the resistor according to the temperature of the object to be measured, The purpose is to provide a temperature detection circuit that increases the change in the divided voltage near the temperature to be measured to improve the resolution of the thermistor and increases the temperature detection accuracy in a wide range. When used in a control device, the resistance can be switched using a pulse signal, and two types of divided voltage can be obtained: low temperature (for detecting thermistor disconnection) and high temperature (for automatic extinguishing temperature detection). In this way, it is an object of the present invention to provide a temperature detection circuit for a combustion appliance that improves the accuracy of temperature detection by comparing the set voltage on the low temperature side with the set voltage on the high temperature side.
【０００６】[0006]
【課題を解決するための手段】本発明の燃焼器具の温度
検出回路は、サーミスタとサーミスタに直列接続した抵
抗とによる分圧電圧から温度を検出する温度検出回路に
おいて、サーミスタＴＨに直列接続する抵抗Ｒ1 ，
Ｒ2 ，Ｒ3 を複数設けると共に、該抵抗Ｒ1 ，Ｒ2 ，Ｒ
3 をサーミスタＴＨに切替え接続する切替え手段を設け
て、サーミスタ温度に対応して抵抗Ｒ1 ，Ｒ2 ，Ｒ3 を
切替え、サーミスタＴＨとサーミスタに直列接続される
抵抗とで得られる分圧電圧Ｖ1 から温度を検出するもの
で、サーミスタＴＨに直列接続する抵抗を検出したい温
度に合せて切替え、検出したい温度付近での分圧電圧の
変化量を大きくし、分圧電圧から温度検出をする。A temperature detecting circuit for a combustion appliance according to the present invention is a temperature detecting circuit for detecting a temperature from a divided voltage by a thermistor and a resistor connected in series with the thermistor. R 1 ,
R 2, together with the R 3 provide a plurality, the resistor R 1, R 2, R
By providing switching means for switching and connecting 3 to the thermistor TH, the resistors R 1 , R 2 and R 3 are switched according to the temperature of the thermistor, and the divided voltage V obtained by the thermistor TH and the resistance connected in series to the thermistor. The temperature is detected from 1, and the resistance connected in series to the thermistor TH is switched according to the temperature to be detected, the change amount of the divided voltage near the temperature to be detected is increased, and the temperature is detected from the divided voltage.
【０００７】そして、抵抗を切替え接続する切替え手段
として、抵抗Ｒ1 ，Ｒ2 に電界効果トランジスタＦＥＴ
1 ，ＦＥＴ2 を直列に介装した回路を複数設けると共
に、抵抗Ｒ3 のみの回路とを設け、これらの回路を並列
にしてサーミスタＴＨに接続し、サーミスタＴＨと上記
各回路との分圧電圧Ｖ1 をマイクロコンピュータＡに入
力するように接続して、マイクロコンピュータＡからの
指令で電界効果トランジスタＦＥＴ1 ，ＦＥＴ2 を制御
し、サーミスタＴＨに直列に接続する抵抗をサーミスタ
温度に応じて切替え可能としたもので、分圧電圧Ｖ1 が
マイクロコンピュータＡに入力されると、電圧レベルの
判定が行われ、温度レベルに応じて電界効果トランジス
タＦＥＴ1 ，ＦＥＴ2 がオン又はオフされサーミスタＴ
Ｈに、抵抗Ｒ3 のみが直列接続される場合と、抵抗Ｒ2
と抵抗Ｒ3 の並列回路が接続される場合と、抵抗Ｒ1 と
抵抗Ｒ2 と抵抗Ｒ3 の並列回路が接続される場合等に切
替え接続され、検出しようとする温度に合った抵抗値を
選択することができる。Then, as a switching means for switching and connecting the resistors, the field effect transistor FET is connected to the resistors R 1 and R 2.
1. A plurality of circuits in which 1 and FET 2 are provided in series are provided, and a circuit having only a resistor R 3 is provided, and these circuits are connected in parallel to the thermistor TH, and a divided voltage between the thermistor TH and each of the above circuits is provided. By connecting V 1 to the microcomputer A, the field effect transistors FET 1 and FET 2 are controlled by a command from the microcomputer A, and the resistance connected in series to the thermistor TH can be switched according to the thermistor temperature. When the divided voltage V 1 is input to the microcomputer A, the voltage level is determined, the field effect transistors FET 1 and FET 2 are turned on or off according to the temperature level, and the thermistor T is turned on.
And if the H, only the resistor R 3 are connected in series, the resistor R 2
And a resistor R 3 are connected in parallel, and a resistor R 1 and a resistor R 2 are connected in parallel, such as when a resistor R 3 is connected in parallel and a resistance value suitable for the temperature to be detected is selected. You can choose.
【０００８】また、パルス制御方式を用いた燃焼器具に
使用する場合は、パルス信号を利用し、サーミスタＴＨ
の両端に抵抗Ｒ4 ，Ｒ5 を接続し、パルス信号のＨｉ−
Ｌｏに応じてこれらの抵抗Ｒ4 ，Ｒ5 を切替え接続する
切替え手段を設け、サーミスタＴＨとサーミスタＴＨに
接続される抵抗Ｒ4 ，Ｒ5 で得られる分圧電圧Ｖ3 ，Ｖ
4 を、高温側（自動消火温度検出用）と低温側（サーミ
スタの断線検出用）の２種類発生させ、高温側の設定電
圧Ｖ6 と低温側の設定電圧Ｖ7とそれぞれ比較し温度を
検出するもので、この場合は、パルス信号を利用してパ
ルス電圧Ｖ2 のＨｉ−Ｌｏに応じてサーミスタＴＨに直
列に接続されるこれらの抵抗Ｒ4 ，Ｒ5 を切替え、サー
ミスタＴＨに抵抗Ｒ4 が直列に接続された場合は、高温
側の温度すなわち自動消火温度に達しているか否かを判
断するための分圧電圧Ｖ3 が得られ、サーミスタＴＨに
抵抗Ｒ5 が直列に接続された場合は、低温側の温度すな
わちサーミスタＴＨが断線しているか否かを判断するた
めの分圧電圧Ｖ4 が得られ、高温側の設定電圧と低温側
の設定電圧とそれぞれ比較して自動消火温度以上である
か否か、サーミスタが断線しているか否かを判定する。Further, when used in a combustion appliance using a pulse control system, a pulse signal is used to enable thermistor TH.
Connect resistors R 4 and R 5 to both ends of the
Depending on Lo provided switching means for switching connection of the resistor R 4, R 5 thereof, the resistance R 4, the divided voltage obtained at R 5 V 3 which is connected to the thermistor TH and the thermistor TH, V
4, the high-temperature side to the two generation (auto extinguishing temperature detection) and the low-temperature side (for disconnection detection of the thermistor), detect respectively compared temperature the hot side of the set voltage V 6 and the low temperature side of the set voltage V 7 intended to, in this case, switching these resistors R 4, R 5 connected in series to the thermistor TH in accordance with the Hi-Lo pulse voltage V 2 by using a pulse signal, the resistor R 4 to the thermistor TH Is connected in series, the divided voltage V 3 for determining whether the temperature on the high temperature side, that is, the automatic fire extinguishing temperature is reached is obtained, and the resistor R 5 is connected in series to the thermistor TH. Is the temperature on the low temperature side, that is, the divided voltage V 4 for determining whether or not the thermistor TH is broken is obtained, and the set voltage on the high temperature side and the set voltage on the low temperature side are compared with each other to obtain the automatic extinction temperature or higher. The thermistor is disconnected. It determines whether or not to have to.
【０００９】パルス信号のＨｉ−Ｌｏに応じて抵抗を切
替え接続する切替え手段として、サーミスタＴＨの両端
に第３電界効果トランジスタＦＥＴ3 と第４電界効果ト
ランジスタＦＥＴ4 とを接続し、第３電界効果トランジ
スタＦＥＴ3のゲートと第４電界効果トランジスタＦＥ
Ｔ4 のゲートとを反転素子ＤＴを介して接続し、入力さ
れるパルス電圧Ｖ2 により２つの電界効果トランジスタ
ＦＥＴ3 ，ＦＥＴ4 を交互にオン−オフさせる構成と
し、サーミスタＴＨの一端と電源との間に接続した抵抗
Ｒ4 と、サーミスタＴＨの他端と電源との間に接続した
抵抗Ｒ5 と、該抵抗Ｒ5 に直列に接続した抵抗Ｒ6 ，Ｒ
7 とを前記切替え手段によりサーミスタＴＨに接続する
抵抗を切替え、サーミスタＴＨの両端に高温側と低温側
の２種類の分圧電圧Ｖ3 ，Ｖ4 を交互に得られるように
したものである。この場合は、入力されるパルス電圧Ｖ
2 により第３電界効果トランジスタＦＥＴ3 がオフし、
第４電界効果トランジスタＦＥＴ4 がオンすると、サー
ミスタＴＨと抵抗Ｒ4 が直列接続となり高温側の分圧電
圧Ｖ3 が得られ、逆に第３電界効果トランジスタＦＥＴ
3 がオンし、第４電界効果トランジスタＦＥＴ4 がオフ
すると、サーミスタＴＨと抵抗Ｒ5 が直列接続、サーミ
スタＴＨと抵抗Ｒ6 ，Ｒ7 が並列接続となり、低温側の
分圧電圧Ｖ4 が得られ、これらの分圧電圧Ｖ3 及び分圧
電圧Ｖ4 を更に抵抗Ｒ6 と抵抗Ｒ7 とで分圧した分圧電
圧Ｖ5 とを各設定電圧と比較することにより、自動消火
温度以上であるか否か、サーミスタＴＨが断線している
か否かを判定することができる。そして、ＦＥＴ3 がオ
フ、ＦＥＴ4 がオンのとき、抵抗Ｒ5 ，Ｒ6 ，Ｒ7 は無
関係となるので、抵抗Ｒ4 は自動消火温度に合せて自由
に決定でき、またＦＥＴ3 がオン、ＦＥＴ4 がオフのと
きは、抵抗Ｒ4 は無関係となり抵抗Ｒ5 等はサーミスタ
の断線判断をする温度に合せて自由に決定できる。A third field effect transistor FET 3 and a fourth field effect transistor FET 4 are connected to both ends of the thermistor TH as a switching means for switching and connecting the resistance in accordance with Hi-Lo of the pulse signal, and the third field effect transistor is connected. The gate of the transistor FET 3 and the fourth field effect transistor FE
The gate of T 4 is connected via the inverting element DT, and the two pulse-effect voltage V 2 is used to alternately turn on and off the two field effect transistors FET 3 and FET 4 , and one end of the thermistor TH and the power source are connected. A resistor R 4 connected between the resistor R 5 , a resistor R 5 connected between the other end of the thermistor TH and a power source, and resistors R 6 and R connected in series with the resistor R 5.
The resistor for connecting 7 and 7 to the thermistor TH is switched by the switching means so that two types of divided voltages V 3 and V 4 on the high temperature side and the low temperature side can be alternately obtained at both ends of the thermistor TH. In this case, the input pulse voltage V
2 turns off the third field effect transistor FET 3 ,
When the fourth field effect transistor FET 4 is turned on, the thermistor TH and the resistor R 4 are connected in series to obtain the divided voltage V 3 on the high temperature side, and conversely, the third field effect transistor FET 4
When 3 turns on and the fourth field effect transistor FET 4 turns off, the thermistor TH and the resistor R 5 are connected in series, the thermistor TH and the resistors R 6 and R 7 are connected in parallel, and the divided voltage V 4 on the low temperature side is obtained. The divided voltage V 3 and the divided voltage V 4 are further divided by a resistor R 6 and a resistor R 7 and the divided voltage V 5 is compared with each set voltage so that the temperature exceeds the automatic extinction temperature. It can be determined whether or not there is a break in the thermistor TH. When the FET 3 is off and the FET 4 is on, the resistors R 5 , R 6 and R 7 are irrelevant, so the resistor R 4 can be freely determined according to the automatic extinction temperature, and the FET 3 is on, When the FET 4 is off, the resistor R 4 becomes irrelevant and the resistor R 5 and the like can be freely determined according to the temperature at which the thermistor is judged to be broken.
【００１０】[0010]
【発明の実施の形態】この発明の実施の形態を図１〜図
７を参照して説明する。図１において、ＴＨはサーミス
タで、これに抵抗Ｒ1 と第１電界効果トランジスタＦＥ
Ｔ1 の直列回路と、抵抗Ｒ2 と第２電界効果トランジス
タＦＥＴ2 の直列回路と、抵抗Ｒ3 のみの回路との並列
回路が接続され、接続点における電源電圧ＶDDの分圧電
圧Ｖ1 がマイクロコンピュータＡに入力できるようにア
ナログポートＡＮに接続され、上記第１，第２電界効果
トランジスタＦＥＴ1 ，ＦＥＴ2のゲートもマイクロコ
ンピュータＡに接続されている。マイクロコンピュータ
Ａの出力側には電磁安全弁駆動トランジスタＴr1のベー
スが接続され、該トランジスタＴr1のコレクターには電
磁安全弁のマグネットコイルＭｇが接続され、エミッタ
ーには電源が接続されている。そして、電源電圧ＶDDを
サーミスタＴＨと抵抗とで分圧した電圧Ｖ1 が、マイク
ロコンピュータＡに入力され、電圧レベルの判定がされ
温度レベルに応じてＦＥＴ1 ，ＦＥＴ2 に指令が出され
オン又はオフされ、第１，第２電界効果トランジスタＦ
ＥＴ1 ，ＦＥＴ2 がオフされると抵抗Ｒ3 のみがサーミ
スタＴＨに直列接続され、低温の温度変化に対応でき、
第２電界効果トランジスタＦＥＴ2 がオンされサーミス
タＴＨに直列に抵抗Ｒ2 と抵抗Ｒ3 の並列回路が接続さ
れると、抵抗値Ｒ3 のみと比べ抵抗値が小さくなるた
め、抵抗Ｒ3 のみが直列接続されている時よりサーミス
タ温度が高い温度（中温）になった場合の温度変化に対
応でき、また、第１，第２電界効果トランジスタＦＥＴ
1 ，ＦＥＴ2 の両者がオンされると、サーミスタＴＨに
直列に抵抗Ｒ1 ，抵抗Ｒ2 ，抵抗Ｒ3 の並列回路が接続
され、サーミスタＴＨに直列に接続される並列回路の合
成抵抗がより小さくなるため更に高温になった場合の温
度変化に対応できるように設定される。この様に、サー
ミスタＴＨに直列接続される抵抗が温度レベルに合せて
切替えられるので、サーミスタＴＨと直列接続された抵
抗とによる分圧電圧Ｖ1 によりマイクロコンピュータＡ
において高精度のサーミスタ温度が検出され、この温度
判定データによりマイクロコンピュータＡより電磁安全
弁駆動トランジスタＴr1に制御信号が出力され、該トラ
ンジスタＴr1をオン又はオフし、電磁安全弁のマグネッ
トコイルＭｇへの通電を制御する。温度範囲が焼物の温
度（３５０℃）、天ぷら鍋温度（２５０℃）、煮物温度
（１００℃）、サーミスタ断線判断温度（−２２℃）等
の様にさらに広い場合や、より高い精度が必要な場合
は、切替え数を増加し、サーミスタＴＨに直列接続でき
る抵抗値の種類を増やすことで対応することが可能であ
る。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, TH is a thermistor having a resistor R 1 and a first field effect transistor FE.
A series circuit of T 1, a series circuit of a resistor R 2 and a second field effect transistor FET 2 , and a parallel circuit of a circuit only of the resistor R 3 are connected, and a divided voltage V 1 of the power supply voltage V DD at the connection point is connected. Is connected to the analog port AN so that it can be input to the microcomputer A, and the gates of the first and second field effect transistors FET 1 and FET 2 are also connected to the microcomputer A. The base of an electromagnetic safety valve driving transistor T r1 is connected to the output side of the microcomputer A, the magnet coil Mg of the electromagnetic safety valve is connected to the collector of the transistor T r1 , and the power source is connected to the emitter. Then, the voltage V 1 obtained by dividing the power supply voltage V DD by the thermistor TH and the resistor is input to the microcomputer A, the voltage level is determined, and a command is issued to the FET 1 and FET 2 according to the temperature level to turn it on. Or it is turned off and the first and second field effect transistors F are
When ET 1 and FET 2 are turned off, only the resistor R 3 is connected in series to the thermistor TH, and it is possible to cope with low temperature changes.
Since the second field effect transistor FET 2 is the series ON by the thermistor TH parallel circuit of a resistor R 2 and the resistor R 3 is connected, the resistance value becomes smaller than only the resistance value R 3, only the resistor R 3 is It can cope with temperature change when the thermistor temperature becomes higher (medium temperature) than when it is connected in series, and the first and second field effect transistor FET
When both 1 and FET 2 are turned on, the parallel circuit of the resistors R 1 , R 2 and R 3 is connected in series to the thermistor TH, and the combined resistance of the parallel circuit connected in series to the thermistor TH becomes higher. Since it becomes smaller, it is set so that it can cope with the temperature change when the temperature becomes higher. In this way, the resistance connected in series to the thermistor TH is switched according to the temperature level, so that the microcomputer A is controlled by the divided voltage V 1 by the resistance connected in series with the thermistor TH.
At the high-precision thermistor temperature is detected, a control signal is output from the microcomputer A to the electromagnetic safety valve drive transistor T r1 according to the temperature determination data, the transistor T r1 is turned on or off, and the electromagnetic safety valve magnet coil Mg is supplied. Control energization. If the temperature range is wider, such as the temperature of baked goods (350 ℃), tempura pan temperature (250 ℃), cooked food temperature (100 ℃), thermistor disconnection judgment temperature (-22 ℃), or higher accuracy is required. In this case, it is possible to deal with the problem by increasing the number of switches and increasing the types of resistance values that can be connected in series to the thermistor TH.
【００１１】図２は、パルス制御方式の燃焼器具に使用
する温度検出回路で、サーミスタＴＨは調理容器の底に
密接するように設置され、該サーミスタＴＨの一端と電
源との間に抵抗Ｒ4 が、サーミスタＴＨの他端と電源と
の間には抵抗Ｒ5 が接続され、また、２つの第３，第４
電界効果トランジスタＦＥＴ3 ，ＦＥＴ4 のドレインが
サーミスタＴＨの両端に接続されている。２つのＦＥＴ
3 ，ＦＥＴ4 のそれぞれのゲートはＦＥＴ3 とＦＥＴ4
を交互にオン−オフする反転素子ＤＴを介して接続され
ている。さらに、サーミスタＴＨの一端（抵抗Ｒ4 側）
は自動消火温度検出用のコンパレータＵ1 の＋入力端子
に接続され、コンパレータＵ1 の−入力端子には抵抗Ｒ
8 と抵抗Ｒ9 の分圧点が接続され、該抵抗Ｒ8 ，抵抗Ｒ
9 により分圧された電源電圧ＶDDの分圧電圧Ｖ6 を高温
側の設定電圧としてコンパレータＵ1 に入力できるよう
になっている。サーミスタの他端（抵抗Ｒ5 側）は抵抗
Ｒ5 , Ｒ6 , Ｒ7の直列回路の抵抗Ｒ5 とＲ6 の接続点
に接続され、抵抗Ｒ6 とＲ7 の接続点はサーミスタ断線
検出用のコンパレータＵ2 の−入力端子に接続され、サ
ーミスタＴＨに直列に抵抗Ｒ5 が接続されたときの分圧
電圧Ｖ4 をコンパレータＵ2 の同相入力電圧範囲に入れ
る必要があるので抵抗Ｒ6 と抵抗Ｒ7 によりさらに分圧
し、その分圧電圧Ｖ5 を入力できるようにしている。抵
抗Ｒ10と抵抗Ｒ11は電源電圧ＶDDを分圧して低温側の設
定電圧Ｖ7 をコンパレータＵ2 に入力できるように、そ
の分圧点が＋入力端子に接続されている。そして、入力
されるパルス電圧Ｖ2 により第３電界効果トランジスタ
ＦＥＴ3がオフし第４電界効果トランジスタＦＥＴ4 が
オンの時は、図３に示す等価回路となり、ＦＥＴ4 のオ
ンによりサーミスタＴＨのＦＥＴ4 側はＧＮＤ電位とな
り、電源電圧ＶDDはサーミスタ抵抗と抵抗Ｒ4 により分
圧され分圧電圧Ｖ3 が得られる。抵抗Ｒ4 はサーミスタ
断線検出（低温側）には全く影響しない抵抗で、自動消
火検出温度に合せて決定できる。尚、抵抗値が小さいと
消費電流が増加するため、所定の検出精度を満す範囲で
抵抗値を決定する。したがって図５に示す通り２５０℃
近辺で最も分圧電圧Ｖ3 が変化するようにできる。この
分圧電圧Ｖ3は自動消火温度検出用のコンパレータＵ1
に入力され設定電圧と比較され、２５０℃以上であれば
パルス信号が出力されず、２５０℃以下であれば継続し
てパルス信号が出力される。次に、ＦＥＴ3 がオンしＦ
ＥＴ4 がオフとなった場合は図４の等価回路となり、Ｆ
ＥＴ3 のオンによりサーミスタのＦＥＴ3 側がＧＮＤ電
位となり、ＦＥＴ4がオフでサーミスタは抵抗Ｒ6 とＲ
7 と並列接続となり、抵抗Ｒ5 とにより電源電圧ＶDDが
分圧され分圧電圧Ｖ4 が得られる。そして抵抗Ｒ5 ，Ｒ
6 ，Ｒ7 は自動消火検出温度には全く影響しない抵抗で
あるから、抵抗Ｒ5 ，Ｒ6 ，Ｒ7 はサーミスタＴＨの断
線検出に合せて決定でき、抵抗Ｒ5 を断線検出レベルの
サーミスタ抵抗付近の値に設定すると、最も検出精度を
高くすることができる。この分圧電圧Ｖ4 は図６に示す
様に−２２℃近辺で最も大きく変化するように設定で
き、該分圧電圧Ｖ4 はコンパレータＵ2 の同相電圧範囲
に入る様に抵抗Ｒ6 とＲ7で分圧し、その分圧電圧Ｖ5
をコンパレータＵ2 に入力し、設定された設定電圧Ｖ7
と比較し（図７）サーミスタＴＨが断線しているか否か
を検出する。FIG. 2 is a temperature detection circuit used in a pulse control type combustion device. The thermistor TH is installed so as to be in close contact with the bottom of a cooking vessel, and a resistor R 4 is provided between one end of the thermistor TH and a power source. However, a resistor R 5 is connected between the other end of the thermistor TH and the power supply, and the two third, fourth
The drains of the field effect transistors FET 3 and FET 4 are connected to both ends of the thermistor TH. Two FET
3, each of the gates of the FET 4 is FET 3 and FET 4
Are alternately connected to each other via an inversion element DT that turns on and off. Furthermore, one end of the thermistor TH (on the side of the resistor R 4 )
Is connected to the + input terminal of the comparator U 1 for automatic fire extinguishing temperature detection, and the resistor R is connected to the-input terminal of the comparator U 1.
8 and the dividing point is connected to the resistor R 9, the resistor R 8, resistor R
The divided voltage V 6 of the power supply voltage V DD divided by 9 can be input to the comparator U 1 as a set voltage on the high temperature side. The other end of the thermistor (resistance R 5 side) is connected to the connection point of the resistors R 5 and R 6 of the series circuit of the resistors R 5, R 6, R 7, the connection point of the resistors R 6 and R 7 thermistor disconnection detection use of the comparator U 2 of - is connected to the input terminal, the resistor R 6 it is necessary to take into minute voltage V 4 common-mode input voltage range of the comparator U 2 at the time when the resistor R 5 in series is connected to the thermistor TH Further, the voltage is further divided by the resistor R 7 so that the divided voltage V 5 can be input. The voltage dividing points of the resistors R 10 and R 11 are connected to the + input terminal so that the power source voltage V DD can be divided and the setting voltage V 7 on the low temperature side can be input to the comparator U 2 . Then, when the third field effect transistor FET 3 is turned off and the fourth field effect transistor FET 4 is turned on by the input pulse voltage V 2 , the equivalent circuit shown in FIG. 3 is obtained, and when the FET 4 is turned on, the FET of the thermistor TH is turned on. The 4th side becomes the GND potential, and the power supply voltage V DD is divided by the thermistor resistor and the resistor R 4 to obtain the divided voltage V 3 . The resistance R 4 has no effect on the thermistor disconnection detection (low temperature side), and can be determined in accordance with the automatic extinction detection temperature. Since the current consumption increases when the resistance value is small, the resistance value is determined within a range that satisfies the predetermined detection accuracy. Therefore, as shown in FIG.
The divided voltage V 3 can be changed most in the vicinity. This divided voltage V 3 is used as a comparator U 1 for automatic extinguishing temperature detection.
When the temperature is 250 ° C. or higher, the pulse signal is not output, and when the temperature is 250 ° C. or lower, the pulse signal is continuously output. Next, FET 3 turns on and F
When ET 4 is turned off, the equivalent circuit of Fig. 4 is obtained and F
When ET 3 is turned on, the FET 3 side of the thermistor becomes GND potential, and when FET 4 is turned off, the thermistor has resistors R 6 and R
7 is connected in parallel, and the power source voltage V DD is divided by the resistor R 5 to obtain a divided voltage V 4 . And the resistors R 5 , R
Since 6 and R 7 are resistors that do not affect the automatic fire extinguishing detection temperature at all, the resistors R 5 , R 6 and R 7 can be determined in accordance with the detection of disconnection of the thermistor TH, and the resistor R 5 is the thermistor resistance at the disconnection detection level. The detection accuracy can be maximized by setting a value near the value. The divided voltage V 4 can be set to change the largest in the vicinity of the -22 ° C. As shown in FIG. 6, the resistor R 6 as divided voltage V 4 enters the common-mode voltage range of the comparator U 2 R The voltage is divided by 7 and the divided voltage V 5
Is input to the comparator U 2 to set the set voltage V 7
(FIG. 7) to detect whether or not the thermistor TH is disconnected.
【００１２】[0012]
【実施例】以下に、この発明の実施例を図８に基づいて
説明する。図８において、１は電磁安全弁Ｖを駆動しガ
ス供給通路を開閉する電磁安全弁駆動回路で、パルス発
生部２も備え、電源回路７に接続されている。パルス発
生部２には電池電圧監視回路３、本発明に係る温度検出
回路４、熱電対ＴＣを用いた炎検知回路５の順に各異常
検出回路が接続され、パルス発生部２から発信されたパ
ルス信号が上記各異常検出回路を経由して再び電磁安全
弁駆動回路１及びパルス発生部２にフィードバックされ
ている。６はパルス監視回路で電池電圧監視回路３に接
続され、パルス信号が停止したとき電源回路７の出力を
オフするもので、また、乾電池Ｅにイグナイタースイッ
チＳＷを介してイグナイターＩＧが接続され、イグナイ
タースイッチＳＷをオンするとパルス監視回路６がオン
し電源回路７から電磁安全弁駆動回路１に出力するよう
になっている。そして、上記電池電圧監視回路３、温度
検出回路４、炎検知回路５等の各異常検出回路が正常な
らばパルス発生部２から発信されたパルス信号が次々に
伝達され再び電磁安全弁駆動回路１及びパルス発生部２
にフィードバックされパルス発生部２からも継続してパ
ルス信号が発信され、電磁安全弁Ｖのマグネットコイル
を継続して励磁し電磁安全弁を開に保持し燃焼を継続
し、異常を検出するとパルス信号がスットプし燃焼を停
止しする。この様なパルス制御方式の燃焼器具に本発明
の温度検出回路を組込むと、パルス信号が入力されパル
ス電圧Ｖ2 で抵抗の切替えがパルスに同期して行なわ
れ、常時高温側と低温側の分圧電圧Ｖ3 ，Ｖ4 が得ら
れ、分圧電圧Ｖ3 はコンパレータＵ1 に入力され自動消
火温度である２５０℃以上であるか否かが監視され、２
５０℃以上になるとコンパレータＵ1 からパルス信号が
出力されず、燃焼を停止することができる。このように
燃焼器具のフェールセーフ性も向上させることができ
る。そして、低温側の分圧電圧Ｖ4 はコンパレータＵ2
の同相電圧範囲内に入る様にさらに抵抗Ｒ6 ，Ｒ7 によ
り分圧され、その分圧電圧Ｖ5 がコンパレータＵ2 に入
力され、サーミスタＴＨが断線しているか否かを監視す
る。サーミスタＴＨが断線するとコンパレータＵ2 の出
力がＬo となり別の回路を介してシステムを停止し燃焼
をストップする。Embodiment An embodiment of the present invention will be described below with reference to FIG. In FIG. 8, reference numeral 1 denotes an electromagnetic safety valve drive circuit for driving the electromagnetic safety valve V to open and close the gas supply passage, which also includes a pulse generator 2 and is connected to the power supply circuit 7. A battery voltage monitoring circuit 3, a temperature detection circuit 4 according to the present invention, and a flame detection circuit 5 using a thermocouple TC are connected to the pulse generation unit 2 in this order, and each abnormality detection circuit is connected to the pulse generation unit 2. The signal is fed back to the electromagnetic safety valve drive circuit 1 and the pulse generation section 2 again via each of the abnormality detection circuits. A pulse monitoring circuit 6 is connected to the battery voltage monitoring circuit 3 and turns off the output of the power supply circuit 7 when the pulse signal stops. Further, the dry battery E is connected to the igniter IG via the igniter switch SW, and the igniter is connected. When the switch SW is turned on, the pulse monitoring circuit 6 is turned on and the power supply circuit 7 outputs the pulse to the electromagnetic safety valve drive circuit 1. If the abnormality detection circuits such as the battery voltage monitoring circuit 3, the temperature detection circuit 4, and the flame detection circuit 5 are normal, the pulse signals transmitted from the pulse generator 2 are transmitted one after another, and the electromagnetic safety valve drive circuit 1 and again. Pulse generator 2
The pulse signal is continuously transmitted from the pulse generator 2, the magnet coil of the electromagnetic safety valve V is continuously excited, the electromagnetic safety valve is held open, and the combustion is continued. When an abnormality is detected, the pulse signal is stopped. Then stop burning. When the temperature detecting circuit of the present invention is incorporated in such a pulse control type combustion instrument, a pulse signal is input and the resistance is switched by the pulse voltage V 2 in synchronism with the pulse. Pressure voltages V 3 and V 4 are obtained, and the divided voltage V 3 is input to the comparator U 1 to monitor whether it is 250 ° C. or higher, which is the automatic extinction temperature, and 2
When the temperature exceeds 50 ° C., the pulse signal is not output from the comparator U 1 and the combustion can be stopped. In this way, the fail-safe property of the combustion instrument can be improved. Then, the divided voltage V 4 on the low temperature side is supplied to the comparator U 2
Is further divided by resistors R 6 and R 7 so as to fall within the common-mode voltage range, the divided voltage V 5 is input to the comparator U 2 , and it is monitored whether the thermistor TH is disconnected. The output of comparator U 2 thermistor TH is disconnected to stop stop burning system through a circuit different next L o.
【００１３】[0013]
【発明の効果】この発明は以上説明したように構成され
ているので、以下に記載するような効果を奏する。Since the present invention is configured as described above, it has the following effects.
【００１４】請求項１の発明によれば、サーミスタに直
列に接続する抵抗を複数設け、この抵抗をサーミスタに
切替え接続する切替え手段を設けて、サーミスタ温度に
対応して抵抗を切替え接続することができるので、検出
したい温度での電圧変化量を大きくできる。それ故、サ
ーミスタの分解能を高め、検出精度を高くすることがで
きる。According to the first aspect of the present invention, a plurality of resistors connected in series to the thermistor are provided, and switching means for switching and connecting the resistors to the thermistor is provided to switch and connect the resistors according to the thermistor temperature. Therefore, the voltage change amount at the temperature to be detected can be increased. Therefore, the resolution of the thermistor can be increased and the detection accuracy can be increased.
【００１５】請求項２の発明によれば、抵抗に電界効果
トランジスタを直列に介装した回路を複数設けてサーミ
スタに接続しているので、マイクロコンピュータにより
電界効果トランジスタをオン−オフ制御することによ
り、サーミスタに接続する抵抗を何段にも切替えること
ができ、サーミスタ温度の広い範囲の温度変化に対応で
き、検出精度も高くすることができる。According to the second aspect of the invention, since a plurality of circuits in which the field effect transistor is interposed in series with the resistor is provided and connected to the thermistor, the on / off control of the field effect transistor is performed by the microcomputer. The resistance connected to the thermistor can be switched in multiple stages, and it is possible to cope with temperature changes in a wide range of the thermistor temperature and to improve detection accuracy.
【００１６】請求項３の発明によれば、パルス制御方式
の燃焼器具のパルス信号を利用して抵抗値を切替えるこ
とができ、かつ低温側と高温側の分圧電圧が得られるの
で、この分圧電圧と設定電圧とを比較して自動消火温度
とサーミスタの断線を監視できる。それ故、検知精度を
上げることができ、パルス制御方式の燃焼器具の安全性
を向上させることができる。また、従来のように半固定
抵抗を用いて設定電圧を調整する必要もなく便利であ
る。According to the third aspect of the present invention, the resistance value can be switched by using the pulse signal of the pulse control type combustion instrument, and the divided voltage on the low temperature side and the high temperature side can be obtained. It is possible to monitor the automatic fire extinguishing temperature and disconnection of the thermistor by comparing the piezoelectric voltage and the set voltage. Therefore, it is possible to increase the detection accuracy and improve the safety of the pulse control type combustion instrument. Further, it is convenient because it is not necessary to adjust the set voltage using a semi-fixed resistor as in the conventional case.
【００１７】請求項４の発明によれば、電界効果トラン
ジスタと反転素子との組合せにより、パルス信号に同期
してサーミスタに接続する抵抗が切替えられるので、常
時低温側と高温側の分圧電圧をサーミスタの両端に発生
させることができ、同時に低温側と高温側の温度監視が
できる。さらに、低温側の分圧電圧を得るときは、高温
側の抵抗を無関係にし、反対に、高温側の分圧電圧を得
るときは、低温側の抵抗を無関係にすることができるの
で、抵抗値を検出しようとする温度に合せて最も検出精
度を高くする値に設定でき、高温側と低温側とで検出温
度に大きな差があっても高精度で温度検出ができ、消費
電力も少なくすることができる。According to the fourth aspect of the present invention, the resistance connected to the thermistor is switched in synchronization with the pulse signal by the combination of the field effect transistor and the inverting element. It can be generated at both ends of the thermistor, and at the same time can monitor the temperature of the low temperature side and the high temperature side. Furthermore, when the divided voltage on the low temperature side is obtained, the resistance on the high temperature side is irrelevant, and on the contrary, when the divided voltage on the high temperature side is obtained, the resistance on the low temperature side is irrelevant. The temperature can be set to a value that maximizes the detection accuracy according to the temperature to be detected, and even if there is a large difference in the detected temperature between the high temperature side and the low temperature side, it is possible to detect the temperature with high accuracy and reduce power consumption. You can
【図１】電界効果トランジスタを制御してサーミスタに
直列接続する抵抗を切替える燃焼器具の温度検出回路の
回路図である。FIG. 1 is a circuit diagram of a temperature detection circuit of a combustion instrument that controls a field effect transistor to switch a resistance connected in series to a thermistor.
【図２】入力するパルス信号によりサーミスタに接続す
る抵抗を切替える燃焼器具の温度検出回路の回路図であ
る。FIG. 2 is a circuit diagram of a temperature detection circuit of a combustion instrument that switches a resistance connected to a thermistor according to an input pulse signal.
【図３】図２においてＦＥＴ3 がオフ、ＦＥＴ4 がオン
した場合の等価回路である。FIG. 3 is an equivalent circuit when FET 3 is off and FET 4 is on in FIG.
【図４】図２においてＦＥＴ3 がオン、ＦＥＴ4 がオフ
した場合の等価回路である。FIG. 4 is an equivalent circuit when FET 3 is on and FET 4 is off in FIG.
【図５】サーミスタ温度に対する高温側の分圧電圧Ｖ3
の変化と、設定電圧の関係を示す図である。FIG. 5: Partial voltage V 3 on the high temperature side with respect to the thermistor temperature
It is a figure which shows the relationship of the change of and a setting voltage.
【図６】サーミスタ温度に対する低温側の分圧電圧Ｖ4
の変化を示す図である。FIG. 6 shows the divided voltage V 4 on the low temperature side with respect to the thermistor temperature.
It is a figure which shows the change of.
【図７】サーミスタ温度に対する分圧電圧Ｖ5 の変化
と、設定電圧との関係を示す図である。FIG. 7 is a diagram showing a relationship between a change in divided voltage V 5 with respect to the thermistor temperature and a set voltage.
【図８】パルス制御方式の燃焼制御回路の説明図であ
る。FIG. 8 is an explanatory diagram of a pulse control type combustion control circuit.
【図９】従来例の回路図である。FIG. 9 is a circuit diagram of a conventional example.
ＴＨ…サーミスタ、Ｒ1 ，Ｒ2 ，Ｒ3 ，Ｒ4 ，Ｒ5 ，Ｒ
6 ，Ｒ7 …抵抗、ＦＥＴ1 ，ＦＥＴ2 ，ＦＥＴ3 ，ＦＥ
Ｔ4 …電界効果トランジスタ、Ａ…マイクロコンピュー
タ、ＤＴ…反転素子、Ｖ1 ，Ｖ3 ，Ｖ4 ，Ｖ5 …分圧電
圧、Ｖ2 …パルス電圧。TH ... Thermistor, R 1 , R 2 , R 3 , R 4 , R 5 , R
6 , R 7 ... Resistor, FET 1 , FET 2 , FET 3 , FE
T 4 ... field effect transistors, A ... microcomputer, DT ... inverting element, V 1, V 3, V 4, V 5 ... divided voltage, V 2 ... pulse voltage.
Claims (4)
抗とによる分圧電圧から温度を検出する温度検出回路に
おいて、サーミスタ（ＴＨ）に直列に接続する抵抗（Ｒ
1 ，Ｒ2 ，Ｒ3 ）を複数設けると共に、該抵抗（Ｒ1 ，
Ｒ2 ，Ｒ3 ）をサーミスタ（ＴＨ）に切替え接続する切
替え手段を設けて、サーミスタ温度に対応して抵抗（Ｒ
1 ，Ｒ2 ，Ｒ3 ）を切替え、サーミスタ（ＴＨ）とサー
ミスタに直列接続される抵抗とで得られる分圧電圧（Ｖ
1 ）から、温度を検出する燃焼器具の温度検出回路。1. A temperature detecting circuit for detecting a temperature from a divided voltage by a thermistor and a resistor connected in series with the thermistor, wherein a resistor (R) connected in series with a thermistor (TH) is used.
1 , R 2 , R 3 ) are provided in plural, and the resistance (R 1 , R 3
A switching means for switching and connecting R 2 and R 3 to the thermistor (TH) is provided so that the resistance (R
1 , R 2 , R 3 ) are switched, and the divided voltage (V) obtained by the thermistor (TH) and the resistance connected in series with the thermistor (V
1 ) From the temperature detection circuit of the combustion equipment to detect the temperature.
抵抗（Ｒ1 ，Ｒ2 ）に電界効果トランジスタ（ＦＥ
Ｔ1 ，ＦＥＴ2 ）を直列に介装した回路を複数設けると
共に、抵抗（Ｒ3 ）のみの回路とを設け、これらの回路
を並列にしてサーミスタ（ＴＨ）に接続し、サーミスタ
（ＴＨ）と上記各回路との分圧電圧（Ｖ1）をマイクロ
コンピュータ（Ａ）に入力するように接続して、マイク
ロコンピュータ（Ａ）からの指令で電界効果トランジス
タ（ＦＥＴ1 ，ＦＥＴ2 ）を制御し、サーミスタ（Ｔ
Ｈ）に直列に接続する抵抗をサーミスタ温度に応じて切
替え可能とした請求項１記載の燃焼器具の温度検出回
路。2. A switching means for switching and connecting resistors,
The field effect transistor (FE) is connected to the resistors (R 1 , R 2 ).
T 1 and FET 2 ) are provided in series and a circuit having only a resistor (R 3 ) is provided, and these circuits are connected in parallel to a thermistor (TH) to connect with the thermistor (TH). The divided voltage (V 1 ) with each of the above circuits is connected so as to be input to the microcomputer (A), and the field effect transistors (FET 1 , FET 2 ) are controlled by a command from the microcomputer (A), Thermistor (T
The temperature detection circuit for a combustion instrument according to claim 1, wherein the resistance connected in series to (H) is switchable according to the thermistor temperature.
Ｒ5 ）を接続し、パルス信号のＨｉ−Ｌｏに応じてこれ
らの抵抗（Ｒ4 ，Ｒ5 ）を切替え接続する切替え手段を
設け、サーミスタ（ＴＨ）とサーミスタ（ＴＨ）に接続
される抵抗（Ｒ4 ，Ｒ5 ）で得られる分圧電圧（Ｖ3 ，
Ｖ4 ）を、高温側と低温側の２種類発生させ、高温側の
設定電圧（Ｖ6 ）と低温側の設定電圧（Ｖ7 ）とそれぞ
れ比較し温度を検出する燃焼器具の温度検出回路。3. A thermistor (TH) having a resistor (R 4 ,
R 5 ) is connected to the thermistor (TH) and a resistor (TH) connected to the thermistor (TH) is provided with switching means for switching and connecting these resistors (R 4 , R 5 ) according to Hi-Lo of the pulse signal. R 4, R 5) divided voltage obtained by (V 3,
The V 4), to two generation of hot and cold sides, the temperature detection circuit of the combustion instrument for detecting the relative respective temperature hot side of the set voltage and (V 6) and the low temperature side of the set voltage (V 7).
替え接続する切替え手段として、サーミスタ（ＴＨ）の
両端に第３電界効果トランジスタ（ＦＥＴ3）と第４電
界効果トランジスタ（ＦＥＴ4 ）とを接続し、第３電界
効果トランジスタ（ＦＥＴ3 ）のゲートと第４電界効果
トランジスタ（ＦＥＴ4 ）のゲートとを反転素子（Ｄ
Ｔ）を介して接続し、入力されるパルス電圧（Ｖ2 ）に
より２つの電界効果トランジスタ（ＦＥＴ3 ，ＦＥ
Ｔ4 ）を交互にオン−オフさせる構成とし、サーミスタ
（ＴＨ）の一端と電源との間に接続した抵抗（Ｒ4 ）
と、サーミスタ（ＴＨ）の他端と電源との間に接続した
抵抗（Ｒ5 ）と、該抵抗（Ｒ5 ）に直列に接続した抵抗
（Ｒ6 ，Ｒ7 ）とを前記切替え手段により切替え、サー
ミスタ（ＴＨ）の両端に高温側と低温側の２種類の分圧
電圧（Ｖ3 ，Ｖ4 ）を交互に得られるようにした請求項
３記載の燃焼器具の温度検出回路。4. A third field effect transistor (FET 3 ) and a fourth field effect transistor (FET 4 ) are provided at both ends of a thermistor (TH) as switching means for switching and connecting resistors in accordance with Hi-Lo of a pulse signal. By connecting the gate of the third field effect transistor (FET 3 ) and the gate of the fourth field effect transistor (FET 4 ) to the inverting element (D
T) and two field effect transistors (FET 3 , FE) depending on the input pulse voltage (V 2 ).
T 4 ) is alternately turned on and off, and a resistor (R 4 ) is connected between one end of the thermistor (TH) and the power supply.
And a resistor (R 5 ) connected between the other end of the thermistor (TH) and the power supply and a resistor (R 6 , R 7 ) connected in series with the resistor (R 5 ) by the switching means. 4. A temperature detecting circuit for a combustion instrument according to claim 3 , wherein two types of divided voltage (V 3 , V 4 ) on the high temperature side and the low temperature side are alternately obtained at both ends of the thermistor (TH).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4540396A JP3554430B2 (en) | 1996-02-07 | 1996-02-07 | Combustion appliance temperature detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4540396A JP3554430B2 (en) | 1996-02-07 | 1996-02-07 | Combustion appliance temperature detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09210808A true JPH09210808A (en) | 1997-08-15 |
| JP3554430B2 JP3554430B2 (en) | 2004-08-18 |
Family
ID=12718296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4540396A Expired - Fee Related JP3554430B2 (en) | 1996-02-07 | 1996-02-07 | Combustion appliance temperature detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3554430B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008267681A (en) * | 2007-04-19 | 2008-11-06 | Paloma Ind Ltd | Heating cooker |
| CN104833439A (en) * | 2015-04-07 | 2015-08-12 | 青岛歌尔声学科技有限公司 | Temperature detection circuit and electronic device with same |
| CN108363432A (en) * | 2018-05-09 | 2018-08-03 | 上海新型烟草制品研究院有限公司 | A kind of temprature control method of aerosol generating device, system, equipment, medium and temperature control panel |
| US10309841B2 (en) | 2014-11-11 | 2019-06-04 | Sumitomo Electric Industries, Ltd. | Temperature detecting apparatus |
| CN113108936A (en) * | 2021-04-27 | 2021-07-13 | 广州小鹏汽车科技有限公司 | Temperature sampling device, motor and vehicle |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101880761B1 (en) * | 2011-11-21 | 2018-08-20 | 현대모비스 주식회사 | Drive motor inverter for vehicle |
-
1996
- 1996-02-07 JP JP4540396A patent/JP3554430B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008267681A (en) * | 2007-04-19 | 2008-11-06 | Paloma Ind Ltd | Heating cooker |
| US10309841B2 (en) | 2014-11-11 | 2019-06-04 | Sumitomo Electric Industries, Ltd. | Temperature detecting apparatus |
| CN104833439A (en) * | 2015-04-07 | 2015-08-12 | 青岛歌尔声学科技有限公司 | Temperature detection circuit and electronic device with same |
| CN108363432A (en) * | 2018-05-09 | 2018-08-03 | 上海新型烟草制品研究院有限公司 | A kind of temprature control method of aerosol generating device, system, equipment, medium and temperature control panel |
| CN113108936A (en) * | 2021-04-27 | 2021-07-13 | 广州小鹏汽车科技有限公司 | Temperature sampling device, motor and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3554430B2 (en) | 2004-08-18 |
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