CN203837836U - High precision low temperature ticket thermal resistance temperature measuring circuit - Google Patents
High precision low temperature ticket thermal resistance temperature measuring circuit Download PDFInfo
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- CN203837836U CN203837836U CN201420206152.2U CN201420206152U CN203837836U CN 203837836 U CN203837836 U CN 203837836U CN 201420206152 U CN201420206152 U CN 201420206152U CN 203837836 U CN203837836 U CN 203837836U
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- high precision
- low temperature
- adc analog
- ticket
- constant current
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Abstract
The utility model discloses a high precision low temperature ticket thermal resistance temperature measuring circuit which comprises a three wire heating resistor PT100, a double matching constant current source, a 24 bit high precision ADC analog to digital converter and a reference resistor Rf. The three wire heating resistor PT100 is respectively electrically connected with the double matching constant current source, the differential input end of the 24 bit high precision ADC analog to digital converter, and the reference resistor Rf. The 24 bit high precision ADC analog to digital converter is respectively electrically connected with the double matching constant current source and the reference resistor Rf. The other end of the reference resistor Rf is grounded. The high precision low temperature ticket ADC analog to digital converter and the reference resistor are used, thus the temperature measuring circuit has the advantages of high measurement result precision, low temperature ticket and obvious effect.
Description
Technical field
The utility model belongs to instrument temperature measurement circuit field, particularly a kind of resistance temperature measurement circuit of High Precision Low Temperature ticket.
Background technology
At present, the resistance temperature measurement circuit using in instrument industry is all general common pattern, adopt single constant current source power supply, can there is like this lead resistance, need compensation or the software algorithm of hardware circuit to eliminate the impact of lead resistance on measured value, will increase like this difficulty of design, and can only be used for general commercial Application, application is very limited, eliminate and can not get rid of the impact of lead resistance on measured value completely by additive method, cause measured value and actual value to have larger deviation, low precision, warm ticket is higher simultaneously, large on measuring impact.
The technical problems to be solved in the utility model is to provide the Novel temperature measuring circuit that high, the warm ticket of a kind of measuring accuracy is low, usable range is wide.
Utility model content
For solving the problems such as low, the warm ticket of above-mentioned prior art precision is higher, usable range is limited, the utility model adopts following technical scheme:
The utility model provides a kind of resistance temperature measurement circuit of High Precision Low Temperature ticket, comprise three-wire system thermal resistance PT100, two matching constant current resource, 24 high-precision adc analog to digital converters and reference resistance Rf, described three-wire system thermal resistance PT100 respectively with differential input end, the reference resistance Rf electrical communication of described pair of matching constant current resource, 24 high-precision adc analog to digital converters, described 24 high-precision adc analog to digital converters respectively with described pair of matching constant current resource, reference resistance Rf electrical communication, described reference resistance Rf other end ground connection.
The beneficial effects of the utility model are: adopt ADC analog to digital converter and the reference resistance of two matching constant current resources, High Precision Low Temperature ticket, ensure that high, the warm ticket of temperature measurement circuit measurement result precision is low, successful.
Brief description of the drawings
Fig. 1 is the square frame electrical block diagram of a kind of embodiment of the utility model.
Embodiment
Describe preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing.
Refer to Fig. 1, a kind of resistance temperature measurement circuit of High Precision Low Temperature ticket, comprise three-wire system thermal resistance PT100, two matching constant current resources 2, 24 high-precision adc analog to digital converters 3 and reference resistance Rf4, described three-wire system thermal resistance PT100 respectively with described pair of matching constant current resource 2, the differential input end of 24 high-precision adc analog to digital converters 3, reference resistance Rf4 electrical communication, described 24 high-precision adc analog to digital converters 3 respectively with described pair of matching constant current resource 2, reference resistance Rf4 electrical communication, described reference resistance Rf4 other end ground connection, suppose that two equal two matching constant current resource electric currents are I1, I2, the lead resistance of three-wire system thermal resistance PT100 is RW1, RW2, RW3, the voltage of RW1 end is UA, the voltage of RW2 end is UB, 24 High Precision Low Temperature ticket ADC analog to digital converter 3 differential input end voltages are UADCC, the reference resistance of 24 High Precision Low Temperature ticket ADC analog to digital converters is Rf, its reference voltage is UREF, : RW1=RW2=RW3, I1=I2, if I1=I2=I, :
UA=I*(RW1+PT100)+2*I(WR3+Rf)；
UB=I*RW2+2*I(RW3+Rf);
UADCC=UA-UB
=I*(RW1+PT100)+2*I(WR3+Rf)-I*RW2+2*I(RW3+Rf)
=I*PT100;
Obtaining 24 high-precision adc analog to digital converters, 3 differential input end voltages by the above-mentioned derivation of equation is UADCC=I*PT100, and through 24 high-precision adc analog to digital conversion, 3 are converted to: (UADCC/UREF) * 2
24=(I*PT100/I*2*Rf) * 2
24=(PT100/2*Rf) * 2
24reach a conclusion in sum: as long as the reference resistance Rf of 24 high-precision adc analog to digital converters 3 selects the metalfilmresistor of high precision, low temperature ticket just can realize the resistance temperature measurement circuit of High Precision Low Temperature ticket, and the metalfilmresistor of high precision, low temperature ticket can obtain on the market, the signal being converted to through 24 high-precision adc analog to digital converters 3 is given the processing of MCU microcontroller, high precision and the low temperature ticket that can realize temperature measurement circuit by above-mentioned improvement, effectively solve the impact of lead resistance on measured value.
Above-described embodiment and graphic and non-limiting product form of the present utility model and style, suitable variation or modification that any person of an ordinary skill in the technical field does it, all should be considered as not departing from patent category of the present utility model.
Claims (1)
1. the resistance temperature measurement circuit of a High Precision Low Temperature ticket, it is characterized in that: comprise three-wire system thermal resistance PT100(1), two matching constant current resources (2), 24 high-precision adc analog to digital converters (3) and reference resistance Rf(4), described three-wire system thermal resistance PT100(1) respectively with described pair of matching constant current resource (2), the differential input end of 24 high-precision adc analog to digital converters (3), reference resistance Rf(4) electrical communication, described 24 high-precision adc analog to digital converters (3) respectively with described pair of matching constant current resource (2), reference resistance Rf(4) electrical communication, described reference resistance Rf(4) other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420206152.2U CN203837836U (en) | 2014-04-25 | 2014-04-25 | High precision low temperature ticket thermal resistance temperature measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420206152.2U CN203837836U (en) | 2014-04-25 | 2014-04-25 | High precision low temperature ticket thermal resistance temperature measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203837836U true CN203837836U (en) | 2014-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420206152.2U Expired - Fee Related CN203837836U (en) | 2014-04-25 | 2014-04-25 | High precision low temperature ticket thermal resistance temperature measuring circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016053244A1 (en) * | 2014-09-29 | 2016-04-07 | GE Intelligent Platforms Embedded Systems, Inc. | Resistance temperature detection with single current source current splitter |
| CN106092362A (en) * | 2016-08-26 | 2016-11-09 | 江苏远望仪器有限公司 | Three-wire type platinum resistance thermometer sensor, PT100 system for detecting temperature |
| CN107941363A (en) * | 2017-12-28 | 2018-04-20 | 重庆工商大学 | Temperature pick-up device and method based on program-controlled double constant-current supplies |
| CN108151903A (en) * | 2018-01-26 | 2018-06-12 | 扬州海通电子科技有限公司 | High Precision Low Temperature drift temp measuring system and its measuring method based on three-wire system PT100 |
| CN110440945A (en) * | 2019-08-27 | 2019-11-12 | 太原合创自动化有限公司 | High Precision Low Temperature floats the double matching constant current resource temperature measurement circuits of discrete |
-
2014
- 2014-04-25 CN CN201420206152.2U patent/CN203837836U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016053244A1 (en) * | 2014-09-29 | 2016-04-07 | GE Intelligent Platforms Embedded Systems, Inc. | Resistance temperature detection with single current source current splitter |
| CN106092362A (en) * | 2016-08-26 | 2016-11-09 | 江苏远望仪器有限公司 | Three-wire type platinum resistance thermometer sensor, PT100 system for detecting temperature |
| CN107941363A (en) * | 2017-12-28 | 2018-04-20 | 重庆工商大学 | Temperature pick-up device and method based on program-controlled double constant-current supplies |
| CN107941363B (en) * | 2017-12-28 | 2019-11-26 | 重庆工商大学 | Temperature pick-up device and method based on program-controlled double constant-current supplies |
| CN108151903A (en) * | 2018-01-26 | 2018-06-12 | 扬州海通电子科技有限公司 | High Precision Low Temperature drift temp measuring system and its measuring method based on three-wire system PT100 |
| CN108151903B (en) * | 2018-01-26 | 2023-12-29 | 扬州海通电子科技有限公司 | High-precision low-temperature drift temperature measurement system based on three-wire PT100 and measurement method thereof |
| CN110440945A (en) * | 2019-08-27 | 2019-11-12 | 太原合创自动化有限公司 | High Precision Low Temperature floats the double matching constant current resource temperature measurement circuits of discrete |
| CN110440945B (en) * | 2019-08-27 | 2024-02-20 | 太原合创自动化有限公司 | High-precision low-temperature drift discrete type double-matching constant current source temperature measuring circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140917 Termination date: 20150425 |
|
| EXPY | Termination of patent right or utility model |