CN2048967U - Temp. compensator for electronic precise hot couple cold-end - Google Patents
Temp. compensator for electronic precise hot couple cold-end Download PDFInfo
- Publication number
- CN2048967U CN2048967U CN 89208662 CN89208662U CN2048967U CN 2048967 U CN2048967 U CN 2048967U CN 89208662 CN89208662 CN 89208662 CN 89208662 U CN89208662 U CN 89208662U CN 2048967 U CN2048967 U CN 2048967U
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- China
- Prior art keywords
- resistance
- temperature
- output terminal
- operational amplifier
- temp
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Abstract
The utility model relates to a temperature compensator for the electronic precise hot couple cold end, comprising a stabilized voltage power supply, a temperature compensator, an amplifier with both ends input and adjustable gain and a fixed voltage divider. The defects of high cost, low precision and difficult adjustment of the prior compensator are solved. The compensating precision can be +-0.5DEG C. The utility model can be used for various apparatus and meters adopting hot couple for temperature measurement.
Description
The utility model relates to a kind of supplementary variable compensation system when using the thermoelectric element thermometric, is a kind of thermocouple cold junction compensation device specifically.It comprises stabilized voltage supply and a temperature compensation means.
This thermocouple cold junction compensation device generally adopts in present work, and its temperature compensation means all is made up of a unbalanced bridge, and this electric bridge comprises 3 copper-manganese resistance R
1, R
2, R
3With a thermistor (copper resistance) R
4Adjusting electric bridge before using makes its zero-compensation temperature spot (being generally 20 ℃) in regulation keep balance, R
4=R
2, compensator is output as 0, when temperature is higher or lower than the zero-compensation temperature spot, and R
4Resistance change R
4≠ R
2, electromotive force that is directly proportional with temperature of electric bridge output is to reach the purpose of automatic compensation.
The application number of China's utility model patent communique (on June 10th, 1987) bulletin is a kind of improvement that 86207306 utility model patent (as Fig. 1) promptly belongs to this compensator.
Generally there is following shortcoming in this compensator:
1, adjust difficulty, compensation precision is low.Because R
4Be generally 0.5 Ω or 1 Ω,, just require R in order to reduce to connect lead and solder joint resistance to the influence of resistance
4And the line between the several resistance of other of electric bridge is short as far as possible.After installing, instrument to carry out that zero point under the zero-compensation temperature is adjusted and the output potential adjustment during high temperature, owing to R
4Can not be away from other several resistance in the electric bridge, so instrument integral body will be placed in the standard thermostatic field when adjusting, and the constant temperature that generally temperature of constant temperature enclosure neither be absolute, so when adjusting otherwise be completely cured and revise reading according to the actual temperature of constant temperature enclosure, not only make to adjust to be difficult for, also should not accomplish real " 0 " output adjustment.When zero-compensation temperature (being generally 20 ℃), the people can coexist in the temperature field with instrument, and during high temperature (being generally 50 ℃), the people can not with instrument with being in the temperature field.Need during adjustment instrument is placed on constant temperature in the constant temperature oven, survey its output potential, according to the difference size between output potential and the standard electrode potential, instrument taken out from constant temperature oven adjust, again instrument is put back in the constant temperature oven after the adjustment, so repeatedly, generally want more than 2 times, thereby adjust difficulty, compensation precision also is difficult to improve, and in 0 ℃～50 ℃ compensation range is ± 3 ℃～8 ℃.
2, very high to resistance requirement in the electric bridge, the one, material must be pure, and the 2nd, the accuracy requirement of resistance is high, and this has not only increased technologic difficulty, has also improved the cost of product.
The purpose of this utility model is to solve above-mentioned the deficiencies in the prior art part, and a kind of high precision, thermocouple cold junction compensation device cheaply are provided.
Technical solution of the present utility model is: the accurate thermocouple cold junction compensation device of a kind of electronic type comprises: stabilized voltage supply 1, and temperature compensation means 2, its special character is: temperature compensation means is by resistance R
5, R
6, R
7, R
8, potentiometer W
1And operational amplifier A
2D forms with temp .-sensitive diodes, R in temperature compensation means
5With R
6Contact A and operational amplifier A
2Be connected with one by resistance R with the contact C of temp .-sensitive diodes D
9～R
15, potentiometer W
2And operational amplifier A
3The amplifier 3 of the input of the both-end formed, Gain Adjustable is connected to one by R between an output terminal N point of the output terminal of amplifier and stabilized voltage supply
16, R
17The fixed potentiometer of being formed 4 is at R
16Two ends be connected to the output terminal of temperature compensation electromotive force.
Stabilized voltage supply in the above-mentioned technical solution can be by the transformer B1 that is connected on ac power input end, bridge rectifier circuit D
1～D
4, filter capacitor C
2, integrated regulator IC
1, stabilivolt D
W, resistance R
2, R
3, R
4And operational amplifier A
1Form A
1Output terminal link to each other with reverse input end, make stabilized voltage supply by a single supply through A
1Conversion obtains the dual power supply of a positive and negative output.
The drawing of accompanying drawing is described as follows:
Fig. 1 is the circuit diagram of an existing compensator.
Fig. 2 is the circuit diagram of an embodiment of the utility model.
Be described in detail as follows of the present utility model in conjunction with Fig. 2 embodiment:
This compensator is by stabilized voltage supply 1, temperature compensation means 2, and the amplifier 3 of both-end input, Gain Adjustable, fixed potentiometer 4 is formed.Stabilized voltage supply comprises a transformer B1 who links to each other with the input end of alternating voltage; The bridge rectifier circuit D that links to each other with the transformer output terminal
1～D
4Filter capacitor C
2Integrated regulator IC
1Capacitor C
1Light emitting diode D
5Resistance R
1～R
4Stabilivolt D
WOperational amplifier A
1, A
1Output terminal link to each other with reverse input end.Be connected with one by resistance R at the output terminal D of stabilized voltage supply point and N point
5～R
8, potentiometer W
1, operational amplifier A
2With the temperature compensation means of temp .-sensitive diodes D composition, the wherein negative electrode of D and amplifier A
2Output terminal link to each other anode and amplifier A
2Reverse input end and resistance R
8Link to each other.Resistance R in temperature compensation means
5With R
6Contact A and operational amplifier A
2Be connected with one by resistance R with the contact C of temp .-sensitive diodes D
9～R
15, potentiometer W
2And operational amplifier A
3The both-end input of being formed, the amplifier of Gain Adjustable.In operational amplifier A
3Output terminal and resistance R
14Contact and the output terminal N point of stabilized voltage supply between be connected to one by resistance R
16, R
17The fixed potentiometer of forming is at R
16Two ends be connected to the output terminal of temperature compensation electromotive force.
The principle of work of this compensator is such:
Insert the 220V alternating voltage at power input, through B1 step-down, bridge rectifier, capacitor C
1Obtain a DC voltage after the filtering, this voltage is through integrated regulator IC
1Preliminary voltage stabilizing after the further voltage stabilizing of voltage stabilizing diode, obtains a constant DC voltage again, and this voltage is through operational amplifier A
1Conversion obtains the dual power supply of a positive and negative output.
Constant voltage is through R
5, R
6, W
1, R
7Dividing potential drop is in operational amplifier A
2Input end in the same way set up a reference voltage V
a, when temperature variation, the forward voltage drop V of temp .-sensitive diodes D
DAlso change, at A
2Output terminal just to obtain a size be V
a+ V
DAnd the voltage that changes with temperature, A
2Simultaneously also provide a constant working current to D, the size of working current is by R
8Decision.
A
2Output voltage pass through R
10Be added to A
3Reverse input end, and pass through R
9Be added to A
3The A of input end point current potential constitutes the both-end input circuit, A in the same way
3With R
11～R
15, W
2Constitute typical Gain Adjustable amplifying circuit, it is with A
3Being amplified to required size after in the same way, the voltage of reverse input end subtracts each other is exported by output terminal.
A
3Output voltage again through R
16, R
17After the fixed potentiometer dividing potential drop of forming, at R
16On obtain required compensating potential.
Adjust W
1Can adjust the zero-compensation point of instrument, adjust W
2The full scale compensating potential that can obtain stipulating.
The parameter of each element is as follows in this compensator:
Transformer B1 2VA 220V/14V
Integrated regulator IC
17809
Operational amplifier A
1～A
3Four-operational amplifier LM324
Commutator tube D
1～D
42CP1
Stabilivolt D
W2DW236
Temp .-sensitive diodes D 2CP1
Resistance R
1750 Ω
Resistance R
2680 Ω
Resistance R
3, R
410K Ω
Resistance R
51.2K Ω
Resistance R
6, R
81.5K Ω
Resistance R
75.1K Ω
Resistance R
9～142K Ω
Wire-wound resistor R
160.5 Ω
Wire-wound resistor R
1799.5 Ω
Potentiometer W
11K Ω
Potentiometer W
2680 Ω
Capacitor C
10.01 μ F
Electrochemical capacitor C
2220 μ F/25V
Can find out that in conjunction with above embodiment the utility model has following advantage compared to existing technology:
1, adopt temp .-sensitive diodes as temperature-sensing element, the conductor length that connects instrument and temperature-sensing element is not required, can connect temperature-sensing element and instrument by long lead, thereby no matter be to adjust at zero point under the zero-compensation temperature or the output potential adjustment during high temperature, do not need instrument and temperature-sensing element are put into thermostatic chamber together, adjust very easy.
2, compensation precision improves greatly, can reach ± 0.5 ℃ compensation precision.
3, lower owing to the resistance precision in the compensator is required, thereby the also corresponding minimizing of its cost.
Claims (2)
1, the accurate thermocouple cold junction compensation device of a kind of electronic type comprises power supply 1, and temperature compensation means 2 is characterized in that: temperature compensation means is by resistance R
5～R
8, potentiometer W
1And operational amplifier A
2D forms with temp .-sensitive diodes; R in temperature compensation means
5With R
6Contact A and operational amplifier A
2Be connected with one by resistance R with the contact C of temp .-sensitive diodes D
9～R
15, potentiometer W
2And operational amplifier A
3The both-end input of being formed, the amplifier 3 of Gain Adjustable; Between an output terminal N point of the output terminal of amplifier and stabilized voltage supply, be connected to one by R
16, R
17The fixed potentiometer of forming 4 is at R
16Two ends be connected to the output terminal of temperature compensation electromotive force.
2, the accurate thermocouple cold junction compensation device of electronic type according to claim 1, it is characterized in that: described stabilized voltage supply 1 is by the transformer B that is connected on ac power input end
1, bridge rectifier circuit D
1～D
4, filter capacitor C
2, integrated regulator IC
1, stabilivolt DW, resistance R
2, R
3, R
4And operational amplifier A
1Form A
1Output terminal link to each other with reverse input end, make stabilized voltage supply by a single supply through A
1Conversion obtains the dual power supply of a positive and negative output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89208662 CN2048967U (en) | 1989-06-15 | 1989-06-15 | Temp. compensator for electronic precise hot couple cold-end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89208662 CN2048967U (en) | 1989-06-15 | 1989-06-15 | Temp. compensator for electronic precise hot couple cold-end |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2048967U true CN2048967U (en) | 1989-12-06 |
Family
ID=4865311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89208662 Withdrawn CN2048967U (en) | 1989-06-15 | 1989-06-15 | Temp. compensator for electronic precise hot couple cold-end |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2048967U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833350A (en) * | 2010-03-29 | 2010-09-15 | 东莞市盛星电脑科技有限公司 | Midpoint voltage self-adaptation device of magnetic resistor network and self-adaptation method |
| CN103674308A (en) * | 2013-12-31 | 2014-03-26 | 大连交通大学 | Precise and adjustable cold junction temperature compensation instrument for thermocouples |
| CN104713655A (en) * | 2013-12-14 | 2015-06-17 | 中国航空工业集团公司第六三一研究所 | Circuit for measuring cold-end temperature of thermocouple |
-
1989
- 1989-06-15 CN CN 89208662 patent/CN2048967U/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833350A (en) * | 2010-03-29 | 2010-09-15 | 东莞市盛星电脑科技有限公司 | Midpoint voltage self-adaptation device of magnetic resistor network and self-adaptation method |
| CN101833350B (en) * | 2010-03-29 | 2014-12-31 | 国网浙江遂昌县供电公司 | Midpoint voltage self-adaptation device of magnetic resistor network and self-adaptation method |
| CN104713655A (en) * | 2013-12-14 | 2015-06-17 | 中国航空工业集团公司第六三一研究所 | Circuit for measuring cold-end temperature of thermocouple |
| CN103674308A (en) * | 2013-12-31 | 2014-03-26 | 大连交通大学 | Precise and adjustable cold junction temperature compensation instrument for thermocouples |
| CN103674308B (en) * | 2013-12-31 | 2016-08-17 | 大连交通大学 | Accurate adjustable thermocouple cold junction compensation instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |