JPH0127070Y2 - - Google Patents
Info
- Publication number
- JPH0127070Y2 JPH0127070Y2 JP17856583U JP17856583U JPH0127070Y2 JP H0127070 Y2 JPH0127070 Y2 JP H0127070Y2 JP 17856583 U JP17856583 U JP 17856583U JP 17856583 U JP17856583 U JP 17856583U JP H0127070 Y2 JPH0127070 Y2 JP H0127070Y2
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- temperature sensor
- temperature
- operational amplifier
- input terminal
- 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
- 238000009529 body temperature measurement Methods 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Description
【考案の詳細な説明】
(a) 考案の技術分野
本考案はニツケル又は白金等を用いた抵抗体温
度センサーを使用し、該抵抗体温度センサーと温
度測定器間の線路抵抗値を無視出来るようにした
温度計測回路に係り、使用部品を少なくし測定精
度を容易に上げることが出来る温度計測回路に関
する。[Detailed description of the invention] (a) Technical field of the invention This invention uses a resistor temperature sensor made of nickel or platinum, etc., so that the line resistance between the resistor temperature sensor and the temperature measuring device can be ignored. The present invention relates to a temperature measurement circuit that can reduce the number of parts used and easily improve measurement accuracy.
(b) 従来技術と問題点
第１図は従来例の温度計測回路のブロツク図で
ある。(b) Prior art and problems Figure 1 is a block diagram of a conventional temperature measuring circuit.
図中１はニツケル又は白金等を用いた抵抗体温
度センサー、２は変換回路、１０は温度測定器、
Ra，Rbは抵抗、ｒは線路抵抗、Ｅは電圧Ｅの電
源、Ｖは電圧計を示す。 In the figure, 1 is a resistor temperature sensor using nickel or platinum, 2 is a conversion circuit, 10 is a temperature measuring device,
Ra and Rb are resistances, r is line resistance, E is a power source of voltage E, and V is a voltmeter.
ニツケル又は白金等を用い温度変化が抵抗値変
化に対応する抵抗温度センサー１を用い温度を計
測する温度計測回路では、抵抗体温度センサー１
と温度測定器１０間の線路抵抗ｒを無視する為
に、第１図に示す如く抵抗体温度センサー１と温
度測定器１０間を３線にて結び、ブリツジ回路を
用い、抵抗体温度センサー１の抵抗値Rx（例えば
温度０℃の時の抵抗値である基準抵抗値Ｒと温度
変化により変化する抵抗ΔRとの和）を、電圧計
Ｖの電圧値及びこの電圧値を抵抗体温度センサー
１の抵抗値Rxに変換する変換回路２により求め
温度を計測する方法は良く知られている。 In a temperature measurement circuit that measures temperature using a resistance temperature sensor 1 made of nickel, platinum, etc., and whose temperature change corresponds to a resistance value change, a resistance temperature sensor 1 is used.
In order to ignore the line resistance r between the resistor temperature sensor 1 and the temperature measuring device 10, three wires are used to connect the resistor temperature sensor 1 and the temperature measuring device 10 as shown in FIG. The resistance value R A method of measuring temperature by using a conversion circuit 2 that converts it into a resistance value R x of 1 is well known.
しかしこの場合測定した電圧値より抵抗体温度
センサ１の抵抗値Rxを求める式は複雑であり、
従つて変換回路２の構成も複雑で使用する部品点
数も多く部品個々の誤差が加わり測定精度向上が
困難な欠点がある。 However, in this case, the formula for calculating the resistance value R x of the resistor temperature sensor 1 from the measured voltage value is complicated,
Therefore, the configuration of the conversion circuit 2 is complicated and the number of parts used is large, and errors of individual parts are added, making it difficult to improve measurement accuracy.
(c) 考案の目的
本考案の目的は上記の欠点に鑑み、出力電圧値
と抵抗体温度センサーの抵抗値との変換回路を不
要にして、使用部品を少なく出来測定精度を容易
に向上出来る温度計測回路の提供にある。(c) Purpose of the invention In view of the above drawbacks, the purpose of the invention is to eliminate the need for a conversion circuit between the output voltage value and the resistance value of the resistor temperature sensor, reduce the number of parts used, and easily improve temperature measurement accuracy. The aim is to provide measurement circuits.
(d) 考案の構成
本考案は上記の目的を達成するために、抵抗体
温度センサーの一方の端子を、負入力端子と出力
端子間を第１の抵抗で接続した第１の演算増巾器
の正入力端子に接続し、該抵抗温度センサーの他
方の端子を出力電圧の1/4の電圧を負入力端子に
入力する第２の演算増巾器の正入力端子に接続す
ると共に該抵抗体温度センサーの基準抵抗値に等
しい値の抵抗を介してアースに接続し、又該第１
の演算増巾器の正入力端子とアース間には定電流
を流すようにし、又該第２の演算増巾器の出力端
子と該第１の演算増巾器の負入力端子を該第１の
抵抗の値と等しい値の抵抗を介して接続し、該抵
抗体温度センサーの温度変化により変化する抵抗
値を該第１の演算増巾器の出力電圧に比例するよ
うにしたことを特徴とする。(d) Structure of the invention In order to achieve the above object, the invention provides a first operational amplifier in which one terminal of a resistor temperature sensor is connected between a negative input terminal and an output terminal through a first resistor. and the other terminal of the resistance temperature sensor is connected to the positive input terminal of a second operational amplifier which inputs a voltage of 1/4 of the output voltage to the negative input terminal of the resistor. Connected to ground through a resistor with a value equal to the reference resistance value of the temperature sensor, and
A constant current is caused to flow between the positive input terminal of the second operational amplifier and the ground, and the output terminal of the second operational amplifier is connected to the negative input terminal of the first operational amplifier. The resistor temperature sensor is connected through a resistor having a value equal to the value of the resistor, so that the resistance value that changes due to a temperature change of the resistor temperature sensor is proportional to the output voltage of the first operational amplifier. do.
(e) 考案の実施例
以下本考案の一実施例につき図に従つて説明す
る。(e) Embodiment of the invention An embodiment of the invention will be described below with reference to the drawings.
第２図は本考案の実施例の温度計測回路のブロ
ツク図である。 FIG. 2 is a block diagram of a temperature measuring circuit according to an embodiment of the present invention.
図中第１図と同一機能のものは同一記号で示
し、３〜７は抵抗で３，４，６の抵抗値はR1，
５の抵抗値は３R1，７の抵抗値は抵抗体温度セ
ンサーの例えば温度０℃における抵抗値である基
準抵抗値Ｒと同じである。８，９は演算増巾器、
１０′は温度測定器、１１は定電流回路で、電流
Ｉを流し又抵抗体温度センサー１の抵抗値Rxは
基準抵抗値Ｒと温度変化により変化する抵抗ΔR
との和である。 In the figure, the same functions as in Figure 1 are indicated by the same symbols, 3 to 7 are resistors, and the resistance values 3, 4, and 6 are R 1 ,
The resistance value of No. 5 is 3R 1 , and the resistance value of No. 7 is the same as the reference resistance value R, which is the resistance value of the resistor temperature sensor at a temperature of 0° C., for example. 8 and 9 are operational amplifiers,
10' is a temperature measuring device, 11 is a constant current circuit through which a current I is passed, and the resistance value R x of the resistor temperature sensor 1 is a resistance ΔR that changes with the reference resistance value R and temperature changes.
It is the sum of
定電流回路１１より電流Ｉを流すと、演算増巾
器８，９の入力インピーダンスは高いので、電流
Ｉは抵抗ｒ→抵抗体温度センサー１→抵抗ｒ→７
（抵抗値Ｒ）を経てアースに流れる。この場合イ
点の電圧をV1、ロ点の電圧をV2とすれば、抵抗
体温度センサー１の温度により変化する抵抗値
ΔRは次式(1)の如くなる。 When a current I is passed from the constant current circuit 11, the input impedance of the operational amplifiers 8 and 9 is high, so the current I flows from the resistor r → resistor temperature sensor 1 → resistor r → 7
(resistance value R) and flows to ground. In this case, if the voltage at point A is V 1 and the voltage at point B is V 2 , then the resistance value ΔR that changes depending on the temperature of the resistor temperature sensor 1 is expressed by the following equation (1).
ΔR＝V1−2V2／Ｉ ……(1)
又ハ点の電圧は4V2となり二点の電圧はV1とな
る。従つて演算増巾器９の出力電圧V0は次式の
如くなる。 ΔR=V 1 −2V 2 /I (1) Also, the voltage at point C becomes 4V 2 and the voltage at two points becomes V 1 . Therefore, the output voltage V 0 of the operational amplifier 9 is as shown in the following equation.
V0＝２（V1−2V2） ……(2)
よつて、温度変化する抵抗値ΔRは次式(3)で表
はされる。 V 0 =2(V 1 -2V 2 )...(2) Therefore, the resistance value ΔR that changes with temperature is expressed by the following equation (3).
ΔR＝２V0／Ｉ ……(3)
(3)式を見れば判る如く、温度により変化する抵
抗値ΔRは出力電圧V0に比例した値として求めら
れ、温度は出力電圧V0で、変換回路を用いるこ
となく求めることが出来る。従つて温度計側回路
は第２図に示すものでよく、第１図に示す従来の
温度計測回路に比し使用部品を少なく出来測定精
度を容易に向上出来る。 ΔR=2V 0 /I...(3) As you can see from equation (3), the resistance value ΔR, which changes with temperature, is found as a value proportional to the output voltage V 0 , and the temperature is the output voltage V 0 , and the conversion It can be obtained without using a circuit. Therefore, the thermometer side circuit may be the one shown in FIG. 2, and compared to the conventional temperature measurement circuit shown in FIG. 1, fewer parts can be used and measurement accuracy can be easily improved.
(f) 考案の効果
以上詳細に説明せる如く本考案によれば、抵抗
体温度センサーの温度により変化する抵抗値を出
力電圧に比例して求めることが出来るので、温度
計測回路の使用部品を少なく出来測定精度を容易
に向上出来る効果がある。(f) Effect of the invention As explained in detail above, according to the invention, the resistance value that changes depending on the temperature of the resistor temperature sensor can be determined in proportion to the output voltage, so the number of parts used in the temperature measurement circuit can be reduced. This has the effect of easily improving performance measurement accuracy.
第１図は従来例の温度計測回路のブロツク図、
第２図は本発明の実施例の温度計測回路のブロツ
ク図である。
図中１は抵抗体温度センサー、２は変換回路、
３〜７，Ra，Rbは抵抗、ｒは線路抵抗、Ｅは電
源、Ｖは電圧計、８，９は演算増巾器、１０，１
０′は温度測定器、１１は定電流回路を示す。
Figure 1 is a block diagram of a conventional temperature measurement circuit.
FIG. 2 is a block diagram of a temperature measuring circuit according to an embodiment of the present invention. In the figure, 1 is a resistor temperature sensor, 2 is a conversion circuit,
3 to 7, Ra and Rb are resistances, r is line resistance, E is power supply, V is voltmeter, 8 and 9 are operational amplifiers, 10, 1
0' indicates a temperature measuring device, and 11 indicates a constant current circuit.
Claims (1)
子と出力端子間を第１の抵抗で接続した第１の演
算増巾器の正入力端子に接続し、該抵抗温度セン
サーの他方の端子を出力電圧の1/4の電圧を負入
力端子に入力する第２の演算増巾器の正入力端子
に接続すると共に該抵抗体温度センサーの基準抵
抗値に等しい値の抵抗を介してアースに接続し、
又該第１の演算増巾器の正入力端子とアース間に
は定電流を流すようにし、又該第２の演算増巾器
の出力端子と該第１の演算増巾器の負入力端子を
該第１の抵抗の値と等しい値の抵抗を介して接続
したことを特徴とする温度計測回路。 One terminal of the resistor temperature sensor is connected to the positive input terminal of a first operational amplifier having a first resistor connected between the negative input terminal and the output terminal, and the other terminal of the resistor temperature sensor is output. Connect it to the positive input terminal of a second operational amplifier that inputs 1/4 of the voltage to the negative input terminal, and connect it to ground via a resistor with a value equal to the reference resistance value of the resistor temperature sensor. ,
Further, a constant current is caused to flow between the positive input terminal of the first operational amplifier and the ground, and a constant current is caused to flow between the output terminal of the second operational amplifier and the negative input terminal of the first operational amplifier. A temperature measurement circuit characterized in that the temperature measurement circuit is connected through a resistor having a value equal to the value of the first resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17856583U JPS6086934U (en) | 1983-11-18 | 1983-11-18 | temperature measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17856583U JPS6086934U (en) | 1983-11-18 | 1983-11-18 | temperature measurement circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6086934U JPS6086934U (en) | 1985-06-14 |
| JPH0127070Y2 true JPH0127070Y2 (en) | 1989-08-14 |
Family
ID=30387649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17856583U Granted JPS6086934U (en) | 1983-11-18 | 1983-11-18 | temperature measurement circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6086934U (en) |
-
1983
- 1983-11-18 JP JP17856583U patent/JPS6086934U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6086934U (en) | 1985-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0127070Y2 (en) | ||
| JPS61210965A (en) | Measuring equipment for low resistance | |
| US2517628A (en) | Temperature responsive device | |
| JPS6221958Y2 (en) | ||
| JPS5920658Y2 (en) | Detection circuit for thermal conduction type vacuum gauge | |
| JPS601429Y2 (en) | Reference temperature conversion type temperature compensation circuit | |
| JPH0620117Y2 (en) | Temperature detection circuit | |
| JPH06331664A (en) | Resistance voltage converter circuit | |
| JPH089618Y2 (en) | Thermistor temperature conversion circuit | |
| JPS6236126Y2 (en) | ||
| JPS594263Y2 (en) | Temperature difference measuring device | |
| JPS5990825U (en) | Vehicle electronic measurement display device | |
| RU2025675C1 (en) | Device for measuring temperature and temperature difference | |
| JPS5937711Y2 (en) | temperature measurement circuit | |
| JPH0239247Y2 (en) | ||
| SU974280A1 (en) | Remote converter of resistannce increment to current ratio | |
| JPH0129586Y2 (en) | ||
| JPH05853Y2 (en) | ||
| SU872982A1 (en) | Device for measuring temperature | |
| JPS6187324U (en) | ||
| JPH0624747Y2 (en) | Temperature / voltage conversion circuit | |
| JPS5850298Y2 (en) | Heat flow meter inspection device | |
| SU983553A1 (en) | Measuring converter | |
| JPH064681U (en) | Resistance measuring device | |
| JPH0625701B2 (en) | Temperature detection circuit of 3-wire resistance temperature sensor |