JPS5845654B2 - temperature detection circuit - Google Patents
temperature detection circuitInfo
- Publication number
- JPS5845654B2 JPS5845654B2 JP54062028A JP6202879A JPS5845654B2 JP S5845654 B2 JPS5845654 B2 JP S5845654B2 JP 54062028 A JP54062028 A JP 54062028A JP 6202879 A JP6202879 A JP 6202879A JP S5845654 B2 JPS5845654 B2 JP S5845654B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- resistance
- resistor
- conductor
- power supply
- 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
- 238000001514 detection method Methods 0.000 title claims description 4
- 239000004020 conductor Substances 0.000 claims description 18
- 238000010586 diagram Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
- G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/005—Circuits arrangements for indicating a predetermined temperature
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Description
【発明の詳細な説明】
この発明は白金抵抗体等の抵抗測温体を用いた湿度検出
回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a humidity detection circuit using a resistance temperature measuring element such as a platinum resistor.
従来より導線抵抗の影響を受けないようにする３導線式
ブリッジ回路が知られている。Conventionally, three-conductor bridge circuits that are not affected by conductor resistance have been known.
これを第１図に示す。This is shown in FIG.
この第１図に示すように、抵抗測温体１０に３本の導線
１１〜１３を接続し、導線１１にある電圧を加え、導線
１２に湿度設定用可変抵抗２３と抵抗２２の直列回路を
接続し、さらに導線１３に抵抗２１を接続する。As shown in FIG. 1, three conductive wires 11 to 13 are connected to the resistance thermometer 10, a certain voltage is applied to the conductive wire 11, and a series circuit of a humidity setting variable resistor 23 and a resistor 22 is connected to the conductive wire 12. Further, a resistor 21 is connected to the conducting wire 13.
ここで導線１３．１２に流れる電流１１．１２を１１＝
ｉ２とすれば、導線１２．１３の抵抗ｒｅによって生じ
る降下電圧ｒｅＸｉ１とｒ ｅ Ｘ Ｉ ２とが等しく
なるので、この導線抵抗ｒｅの影響を無視することがで
きて、電圧■１と■２とを比較することにより抵抗測温
体１０の抵抗Ｒｘが可変抵抗２３の抵抗と一致したこと
、すなわち湿度が設定温度に一致したことが検出できる
。Here, the current 11.12 flowing in the conductor 13.12 is 11=
If i2, the voltage drop reXi1 caused by the resistance re of the conductor 12.13 becomes equal to r e By comparing the values, it can be detected that the resistance Rx of the resistance temperature measuring element 10 matches the resistance of the variable resistor 23, that is, that the humidity matches the set temperature.
ところが、可変抵抗２３の全抵抗値がＲｘの変化範囲よ
りも小さい場合には、電流１２を電流１１より大きくし
、■１の変化範囲とｖ２の可変範囲とを一致させる必要
があるが、こうすると導線抵抗ｒｅで生じる電圧降下が
導線１２と１３とで等しくならなくなるので、前記のよ
うに導線抵抗ｒｅを無視することができなくなる。However, if the total resistance value of the variable resistor 23 is smaller than the variation range of Rx, it is necessary to make the current 12 larger than the current 11 and match the variation range of 1 with the variation range of v2. Then, the voltage drop caused by the conductor resistance re is no longer equal between the conductors 12 and 13, so that the conductor resistance re cannot be ignored as described above.
本発明は、上述のように湿度設定用可変抵抗の全抵抗値
が抵抗測温体の全抵抗変化分と異っている場合にも導線
抵抗の影響を除くことができるように改善した湿度検出
回路を提供することを目的とする。The present invention provides improved humidity detection that can eliminate the influence of conductor resistance even when the total resistance value of the variable resistor for humidity setting differs from the total resistance change of the resistance thermometer as described above. The purpose is to provide circuits.
以下本発明の一実施例について第２図を参照しながら説
明する。An embodiment of the present invention will be described below with reference to FIG.
第２図において、導線１３には可変抵抗３７と抵抗３１
とが接続され、導線１２には抵抗３２．３３が接続され
ている。In FIG. 2, the conductor 13 includes a variable resistor 37 and a resistor 31.
The conductive wire 12 is connected to resistors 32 and 33.
可変抵抗３７から取り出される電圧を■１とし、抵抗３
２゜３３の接続点から取り出される電圧を■２とする。Let the voltage taken out from the variable resistor 37 be ■1, and the resistor 3
The voltage taken out from the connection point of 2°33 is assumed to be ■2.
湿度設定用可変抵抗３４と抵抗３５と可変抵抗３６とに
より分圧回路を構威し、可変抵抗３４から取り出される
電圧を■３とする。The humidity setting variable resistor 34, the resistor 35, and the variable resistor 36 constitute a voltage dividing circuit, and the voltage taken out from the variable resistor 34 is assumed to be 3.
演算増巾器４０と入力抵抗４１〜４３と帰還抵抗４４と
により電圧■１．■２．■３の比較回路を構成する。The voltage ■1. ■2. ■Configure the comparison circuit 3.
ここで抵抗４１〜４４の各値を等しくして、出力電圧■
。Here, the values of resistors 41 to 44 are made equal, and the output voltage is
.
ＵＴが、■０ＵＴ＝−■ｌ＋■２＋■３ となるようにしておく。UT is ■0UT=-■l+■2+■3 Set it so that
可変抵抗３７は、実際上生じる、演算増巾器４０のオフ
セットや電源電圧のばらつきや各抵抗値のばらつき等を
考慮して付は加えたものであるので、説明の便宜上省略
することとする。The variable resistor 37 was added in consideration of the offset of the operational amplifier 40, variations in power supply voltage, variations in each resistance value, etc. that occur in practice, and therefore will be omitted for convenience of explanation.
測温抵抗体１０、導線１３及び抵抗３１の経路を流れる
電流をｉｌとし、導線１２、抵抗３２．３３の経路を流
れる電流を１２とし、この電流１１．１２がたがいに等
しくなるように抵抗３１，３２．３３の値を定める。The current flowing through the path of the resistance temperature detector 10, the conductor 13 and the resistor 31 is il, the current flowing through the path of the conductor 12 and the resistors 32 and 33 is 12, and the resistor 31 is set so that the currents 11 and 12 are equal to each other. , 32.33 is determined.
すると、導１１２．１３で生じる降下電圧ｒ ６ Ｘ
１１ ＋ ｒ ｅ Ｘ １２が等しくなり、且つ■１と
■２は前記式で示されるように（−Ｖ１＋Ｖ２）として
比較されるため、導線抵抗による降下電圧の影響を除く
ことができることになる。Then, the voltage drop r 6 X occurring in the conductor 112.13
11 + r e
さらに湯度設定用可変抵抗３４を含む分圧回路において
、可変抵抗３４の全抵抗変化で生じる■３の電圧差が、
測温抵抗体１０の抵抗Ｒｘの全変化で生じる■１の電位
差と等しくなるよう、すなわち■１．■３の変化分が等
しくなるよう、この可変抵抗３４に流れる電流ｉ３を、
抵抗３５の値を定めることによって調整しておく。Furthermore, in the voltage divider circuit including the variable resistor 34 for hot water temperature setting, the voltage difference (3) caused by the total resistance change of the variable resistor 34 is
so as to be equal to the potential difference (1) caused by the total change in the resistance Rx of the resistance temperature detector 10, that is, (1). ■The current i3 flowing through this variable resistor 34 is
Adjustment is made by determining the value of the resistor 35.
測温抵抗体１０の抵抗Ｒがたとえば０℃のときＲｘｏで
電圧■１がＶｌｏとなるとする。Assume that when the resistance R of the temperature sensing resistor 10 is, for example, 0° C., the voltage 1 at Rxo becomes Vlo.
そして可変抵抗３４を基準点にしたとき電圧■３が、
■ｏｕ’ｒ”” ＶｌＯ＋Ｖ２＋Ｖ３０” Ｏを満足
するような電圧Ｖ３０をとるようにしておく。Then, when the variable resistor 34 is used as a reference point, the voltage (3) is set to a voltage V30 that satisfies (2)ou'r""VlO+V2+V30"O.
このようにしておけば、可変抵抗３４をｔ℃に設定した
ときに、
■３＝■３０＋６■３
となっており、塩度がｔ℃になって測温抵抗体１０の抵
抗がＲｘ１．■１が
ｖｌ−ＶＩＯ＋△■１
となり、前記の抵抗３５の調整により
△■３−△■１
となっているため、
ＶＯＵＴ−一（Ｖｔ、＋△Ｖｌ）＋Ｖ２
＋（Ｖ３０＋Ｖ３）
一■ｌＯ＋■２＋■３０
＝Ｏ
となる。If this is done, when the variable resistor 34 is set to t°C, ■3=■30+6■3, and when the salinity reaches t°C, the resistance of the resistance temperature detector 10 becomes Rx1. ■1 becomes vl-VIO+△■1, and by adjusting the resistor 35 mentioned above, it becomes △■3-△■1, so VOUT-1 (Vt, +△Vl) + V2 + (V30+V3) - lO+■ 2+■30=O.
このように可変抵抗３４の全抵抗値が測温抵抗体１０の
全抵抗変化分と異っている場合でも、可変抵抗３４に流
す電流を調整するようにしているので測温抵抗体１０に
より検出された塩度が設定温度と一致したことが検出で
きる。In this way, even if the total resistance value of the variable resistor 34 is different from the total resistance change of the resistance temperature detector 10, the current flowing through the variable resistor 34 is adjusted, so that the resistance temperature detector 10 can detect the change. It can be detected that the adjusted salinity matches the set temperature.
第１図は従来例の回路図、第２図は本発明の一実施例の
回路図である。
１０・・・測温抵抗体、１１〜１３・・・導線、２３゜
３４・・・塩度設定用抵抗、４０・・・演算増巾器。FIG. 1 is a circuit diagram of a conventional example, and FIG. 2 is a circuit diagram of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Resistance temperature sensor, 11-13... Conductor, 23°34... Salinity setting resistor, 40... Arithmetic amplifier.
Claims (1)
するとともに第３の導線を第１の抵抗を介して電源の他
端に接続し、さらに第２の導線を第２、第３の抵抗を介
して電源の他端に接続して前記第２、第３の導線を流れ
る電流がほぼ等しくなるよう第１、第２、第３の抵抗の
値を設定し、前記第３の導線と前記第１の抵抗との接続
点から第１の電圧を取り出し、前記第２の抵抗と第３の
抵抗との接続点から第２の電圧を取り出すようにし、前
記電源の両端間に湿度設定用可変抵抗を含む分圧回路を
接続してこの可変抵抗より第３の電圧を取り出し、この
第３の電圧の可変範囲が、前記抵抗測温体の抵抗変化に
もとづく前記第１の電圧の可変範囲とほぼ一致するよう
に、前記分圧回路に流す電流を定め、前記第１の電圧と
、前記第２、第３の電圧の和とを比較するようにした湿
度検出回路。The first conductor of the 13-conductor resistance measuring body is connected to one end of the power supply, the third conductor is connected to the other end of the power supply via the first resistor, and the second conductor is connected to the second and second conductors. The values of the first, second, and third resistors are set so that the currents flowing through the second and third conductive wires connected to the other end of the power supply through the resistor No. 3 are approximately equal; A first voltage is taken out from a connection point between the conducting wire and the first resistor, a second voltage is taken out from a connection point between the second resistance and the third resistance, and humidity is maintained between both ends of the power supply. A voltage dividing circuit including a setting variable resistor is connected to take out a third voltage from this variable resistor, and the variable range of this third voltage is the same as that of the first voltage based on the resistance change of the resistance temperature sensor. A humidity detection circuit that determines a current flowing through the voltage dividing circuit so as to substantially match a variable range, and compares the first voltage with the sum of the second and third voltages.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54062028A JPS5845654B2 (en) | 1979-05-18 | 1979-05-18 | temperature detection circuit |
| GB8010890A GB2049195B (en) | 1979-05-18 | 1980-04-01 | Temperature detecting circuit |
| IT67677/80A IT1128886B (en) | 1979-05-18 | 1980-04-29 | TEMPERATURE DETECTOR CIRCUIT |
| DE3016775A DE3016775C2 (en) | 1979-05-18 | 1980-04-30 | Temperature detection circuit |
| HK919/86A HK91986A (en) | 1979-05-18 | 1986-11-27 | A temperature detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54062028A JPS5845654B2 (en) | 1979-05-18 | 1979-05-18 | temperature detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55154430A JPS55154430A (en) | 1980-12-02 |
| JPS5845654B2 true JPS5845654B2 (en) | 1983-10-12 |
Family
ID=13188297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54062028A Expired JPS5845654B2 (en) | 1979-05-18 | 1979-05-18 | temperature detection circuit |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5845654B2 (en) |
| DE (1) | DE3016775C2 (en) |
| GB (1) | GB2049195B (en) |
| HK (1) | HK91986A (en) |
| IT (1) | IT1128886B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60164852U (en) * | 1984-04-11 | 1985-11-01 | 岡田 成人 | Chain saw guide device in pruning machine |
| JPH0333245Y2 (en) * | 1985-12-06 | 1991-07-15 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH553109A (en) * | 1973-04-03 | 1974-08-30 | Schweiger & Schweizer Ladenbau | Dismountable frame. |
-
1979
- 1979-05-18 JP JP54062028A patent/JPS5845654B2/en not_active Expired
-
1980
- 1980-04-01 GB GB8010890A patent/GB2049195B/en not_active Expired
- 1980-04-29 IT IT67677/80A patent/IT1128886B/en active
- 1980-04-30 DE DE3016775A patent/DE3016775C2/en not_active Expired
-
1986
- 1986-11-27 HK HK919/86A patent/HK91986A/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60164852U (en) * | 1984-04-11 | 1985-11-01 | 岡田 成人 | Chain saw guide device in pruning machine |
| JPH0333245Y2 (en) * | 1985-12-06 | 1991-07-15 |
Also Published As
| Publication number | Publication date |
|---|---|
| HK91986A (en) | 1986-12-05 |
| IT1128886B (en) | 1986-06-04 |
| GB2049195B (en) | 1983-05-18 |
| IT8067677A0 (en) | 1980-04-29 |
| DE3016775A1 (en) | 1980-11-20 |
| DE3016775C2 (en) | 1986-08-07 |
| JPS55154430A (en) | 1980-12-02 |
| GB2049195A (en) | 1980-12-17 |
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