CN2241330Y - Platinum resistance temp. measuring device - Google Patents
Platinum resistance temp. measuring device Download PDFInfo
- Publication number
- CN2241330Y CN2241330Y CN 94249174 CN94249174U CN2241330Y CN 2241330 Y CN2241330 Y CN 2241330Y CN 94249174 CN94249174 CN 94249174 CN 94249174 U CN94249174 U CN 94249174U CN 2241330 Y CN2241330 Y CN 2241330Y
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- bridge
- utility
- measuring
- model
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Abstract
The utility model relates to a platinum resistor temperature measuring device, which can send the voltage signal after isolation and differencing amplifying to the power supply of a measuring bridge, the voltage signal can be added with the voltage of the original measuring bridge as the supply voltage of a new measuring bridge, and therefore, the utility model can accomplish the purpose of nonlinearity correction of a platinum resistor and the measuring bridge. The utility model overcomes a method that a nonlinearity correction link must be designed in a traditional temperature measuring device for overcoming the nonlinearity of the platinum resistor and the measuring bridge, so the temperature measuring cost can be greatly reduced under the condition of satisfying industrial practicability. The utility model is easy for debugging and can be widely applied in industrial productions and control processes.
Description
The utility model relates to a kind of surveying instrument, particularly a kind of temperature measuring equipment.
Platinum resistance temperature sensor is to utilize its resistance value to change this characteristic with variation of temperature to carry out thermometricly, and it has advantages such as temperature-measuring range is wide, reliable and stable, is used widely in commercial production and Process Control System.Usually the measurement mechanism that is adopted as shown in Figure 3, R
tBe platinum resistance temperature sensor, R
0, R
1, R
2, R
tForm measuring bridge, E
0Be bridge voltage, when temperature variation, 2 of electric bridge A, B will produce potential difference (PD), through the voltage signal U that isolates, the difference amplifying element produces reflection temperature variation size
f, because all there are nonlinearity erron in platinum resistance itself and electric bridge, make the measuring accuracy of system satisfy industrial application requirements, must be to U
fCarry out gamma correction, nonlinear correction promptly realizes U among the figure
fReach the purpose that non-line is proofreaied and correct, last, the signal of nonlinear correction output send link to become standard signal output through change.The method of gamma correction is more, analog linearization method, pulse digit method of linearization, Nonlinear A/D conversion method of linearization, digital computation method of linearization etc. are arranged, though above-mentioned several method all can reach the high requirement of precision, but because its circuit complexity, debug difficulties, cost is higher, and then makes the cost of platinum resistor temperature measuring be multiplied.
The purpose of this utility model is to provide the platinum resistor temperature measuring device that a kind of cost is low, circuit simple, debugging is convenient, compensation precision is high.
The scheme that the utility model adopted is the voltage signal U that the potential difference (PD) of 2 of A, B among Fig. 3 is exported through isolation, difference amplifying element
fFeed back in the measuring bridge power supply, with E
0By the adding circuit addition, promptly bridge power supply becomes E
0+ U
f, suitably regulate the amplification coefficient of differential amplifier, just can make feedback voltage just compensate non-linear that platinum resistance and electric bridge bring, thereby make U
fKeep good linear relationship with temperature.
Because the utility model is to adopt voltage signal U
fDirectly feed back in the bridge power supply, make E
0+ U
fAs new bridge power supply, realization is to the gamma correction of platinum resistance and electric bridge, therefore, it has exempted above-mentioned several nonlinear correction owing to the complicated trouble that causes of circuit, thereby make circuit simple, debugging is convenient, has particularly reduced special nonlinear correction, make that this utility model is with low cost, and the precision of this bearing calibration can satisfy the accuracy requirement of commercial measurement.
The utility model will be further described below in conjunction with embodiment.
Fig. 1 is a theory diagram of the present utility model.
Fig. 2 is the utility model circuit diagram.
Among Fig. 1, when temperature variation, R
tResistance changes, and electric bridge A, B two ends will produce potential difference (PD), and this potential difference (PD) is through isolating and difference amplification output U
f, U
fThrough feeding back to bridge power supply E
0Addition, the input bridge circuit send link outputting standard signal through change simultaneously.
Among Fig. 2, added 2 followers that are made of operational amplifier 1,2 between electric bridge and differential amplifier, the characteristics of follower are that input impedance is very high, thereby have avoided the influence of differential amplifier to electric bridge, have played the effect of isolating.The potential difference (PD) that A, B are 2 is delivered to operational amplifier 3 and peripheral resistance R behind follower
3, R
4, R
5, R
fThe differential amplifier that constitutes amplifies, and produces U
f, U
fThrough feeding back to adding circuit and E
0Addition, as bridge power supply, this moment, bridge power supply became E
0+ U
f, suitably adjust the COEFFICIENT K of putting down of differential amplifier
f, promptly change resistance R
fSize, can reach the nonlinear distortion of proofreading and correct platinum resistance and electric bridge simultaneously, realize best compensation effect, simultaneously, U
fSend link through change, become standard signal output, reach the purpose of thermometric.Follower is to adopt common fortune to realize, as F007 series amplifier.
Claims (2)
1. platinum resistor temperature measuring device, comprise by measuring isolate, difference is amplified, become and send link and bridge for measuring temperature to form, it is characterized in that the signal input potential difference (PD) of 2 of bridge for measuring temperature A, B is isolated, generation one signal U behind the differential amplifier circuit
f, and with this signal feedback to one adding circuit and bridge power supply E.Addition input bridge resistance R
1With R
2Between contact, synchronous signal U
fAfter sending link, the input change send link outputting standard signal, temperature detecting resistance R by change
tAnd resistance R
0Contact link to each other with ground.
2. device according to claim 1 is characterized in that described isolated part is the follower that adopts operational amplifier 1,2 to constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94249174 CN2241330Y (en) | 1994-12-27 | 1994-12-27 | Platinum resistance temp. measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94249174 CN2241330Y (en) | 1994-12-27 | 1994-12-27 | Platinum resistance temp. measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2241330Y true CN2241330Y (en) | 1996-11-27 |
Family
ID=33853813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94249174 Expired - Fee Related CN2241330Y (en) | 1994-12-27 | 1994-12-27 | Platinum resistance temp. measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2241330Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519619A (en) * | 2011-12-14 | 2012-06-27 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Conditioning method of platinum resistance temperature sensor |
| CN102928109A (en) * | 2012-10-25 | 2013-02-13 | 重庆长安汽车股份有限公司 | Signal collecting circuit |
| CN103323135A (en) * | 2013-06-09 | 2013-09-25 | 广东明阳龙源电力电子有限公司 | IGBT temperature detection circuit |
-
1994
- 1994-12-27 CN CN 94249174 patent/CN2241330Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519619A (en) * | 2011-12-14 | 2012-06-27 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Conditioning method of platinum resistance temperature sensor |
| CN102928109A (en) * | 2012-10-25 | 2013-02-13 | 重庆长安汽车股份有限公司 | Signal collecting circuit |
| CN103323135A (en) * | 2013-06-09 | 2013-09-25 | 广东明阳龙源电力电子有限公司 | IGBT temperature detection circuit |
| CN103323135B (en) * | 2013-06-09 | 2014-12-03 | 广东明阳龙源电力电子有限公司 | IGBT temperature detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |