CN102809443A - Method and circuit for measuring temperature - Google Patents
Method and circuit for measuring temperature Download PDFInfo
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- CN102809443A CN102809443A CN2012100263525A CN201210026352A CN102809443A CN 102809443 A CN102809443 A CN 102809443A CN 2012100263525 A CN2012100263525 A CN 2012100263525A CN 201210026352 A CN201210026352 A CN 201210026352A CN 102809443 A CN102809443 A CN 102809443A
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Abstract
The invention relates to a method and a circuit for measuring the temperature. The method comprises the following steps of respectively measuring voltage V1 at two ends of a standard resistance R2 and voltage V2 at two ends of a temperature measuring resistance R3 after connecting the standard resistance R2 with the temperature measuring resistance R3 in series, wherein the temperature measuring resistance R3=V2/V1*R2; and then obtaining measured temperature according to a resistance value of the temperature measuring resistance R3. According to the method disclosed by the invention, the voltage comparison is carried out by utilizing the standard resistance and the temperature measuring resistance, thus a relationship between the resistance values of the standard resistance and the temperature measuring resistance is obtained, the resistance value of the temperature measuring resistance can be calculated as the resistance value of the standard resistance is stable, and the temperature measured by the temperature measuring resistance can be finally obtained according to the resistance value of the temperature measuring resistance.
Description
Technical field
The present invention relates to a kind of thermometry and device, particularly RTD temperature survey.
Background technology
Because RTD has good temperature-sensing property, many now employing RTDs carry out temperature acquisition as temperature detecting resistance.Traditional acquisition method is as shown in Figure 1, stable constant current source of temperature detecting resistance series connection, and the voltage at sampling temperature detecting resistance two ends amplifies the conversion with AD through signal, outputs to the equipment of using of gathering.Constant current source provides steady current, and under the situation of temperature change, the resistance of temperature detecting resistance also changes thereupon, and measuring the temperature detecting resistance voltage can the corresponding variation of temperature situation of learning.Because the current fluctuation and the amplifier noise of constant current source all can influence measured voltage values, so under the situation that precision temperature is measured, this method requires all very high to the precision of constant-current supply and the antijamming capability of amplifier.
Summary of the invention
The purpose of this invention is to provide a kind of thermometry, measure temperature requirement condition harshness, the problem that accuracy of measurement is low in order to solve prior art.In addition, the present invention also provides a kind of stably measured circuit.
For realizing above-mentioned purpose; Method scheme of the present invention is: a kind of thermometry; With measuring resistance R2 with after temperature detecting resistance R3 connects; The voltage V1 at difference measurement standard resistance two ends and the voltage V2 at temperature detecting resistance two ends, then temperature detecting resistance R3=V2/V1*R2 obtains measured temperature according to temperature detecting resistance R3 resistance then.
A kind of temperature measuring circuit comprises a thermometric branch road that is connected on the direct supply, and this thermometric branch road comprises a measuring resistance and a pair of temperature detecting resistance access point of series connection; Circuit also comprises first SS, and each input end of first SS connects the two ends and the said temperature detecting resistance access point of said measuring resistance respectively, and the output terminal of first SS connects sampling apparatus.
Said sampling apparatus comprises an AD converter and a processor, and the AD converter input end connects the output terminal of said first SS, the output terminal connection processing device of AD converter, said first SS of processor output control linkage.Said thermometric branch road also comprises the current-limiting resistance that is connected in the branch road.Circuit also comprises second SS that is used for one group of temperature detecting resistance is inserted respectively said thermometric branch road, corresponding each temperature detecting resistance that connects of the second SS input end, and output terminal connects said temperature detecting resistance access point.Said temperature detecting resistance is a RTD.
The present invention utilizes measuring resistance and temperature detecting resistance to carry out voltage-contrast; And then know the relation between their resistances; And the resistance of measuring resistance is stable, then can calculate the resistance of temperature detecting resistance, finally learns the temperature that temperature detecting resistance is measured according to the resistance of temperature detecting resistance.Adopt SS to select in the circuit, respectively the voltage of measurement standard resistance and temperature detecting resistance; The output of SS is connected to same sampling apparatus after the AD conversion, rather than adopts two cover sampling apparatuses, does the measuring error that can avoid two cover sampling apparatuses to cause like this.Temperature detecting resistance adopts RTD, selects high precision standard resistance just measuring accuracy can be provided.
Description of drawings
Fig. 1 is existing temperature measuring circuit schematic diagram;
Fig. 2 is measuring principle figure of the present invention;
Fig. 3 is a kind of metering circuit;
Fig. 4 is a kind of metering circuit of many temperature detecting resistances;
Fig. 5 is the metering circuit that adopts analog multichannel switch.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further detailed explanation.
Method embodiment
A kind of thermometry, with measuring resistance R2 with after temperature detecting resistance R3 connects, the voltage V1 and the voltage V2 at temperature detecting resistance two ends at measurement standard resistance two ends respectively, temperature detecting resistance R3=V2/V1*R2 then is then according to temperature detecting resistance R3 resistance acquisition measured temperature.Temperature detecting resistance adopts RTD.
As shown in Figure 2; The RTD R3 measuring resistance R2 that precision is high that connects, and then the common big resistance of connecting adds a common direct voltage source as current-limiting resistance R1 at the resistance two ends of three series connection; Voltage source and current-limiting resistance mate each other, make electric current be limited in about 0.1A.Through control SS 1, gather earlier the voltage V1 of measuring resistance R2, gather the voltage V2 of temperature detecting resistance R3 again, the principle identical according to series current so just can obtain the resistance R3=V2/V1*R2 of temperature detecting resistance.
Like Fig. 3, harvester comprises AD converter and processor, and processor can be controlled SS, selects the resistance of being sampled.
Circuit embodiments 2
As shown in Figure 4, with circuit embodiments 1 different being, increase a SS 2, SS 2 can select to insert the measuring resistance access point of temperature detecting resistance in measuring branch road with a plurality of temperature detecting resistance R4-Rn.So can realize the measurement of a plurality of temperature detecting resistances.
SS can adopt switch, relay or the analog multichannel switch etc. of mechanical system.Analog multichannel switch is a data selector, according to the control command of processor, certain input end of correspondence is connected on the output terminal.As shown in Figure 5, at first analog multichannel switch 2 is connected to access point with the temperature detecting resistance of selecting, and analog multichannel switch 1 is through be connected to output terminal with each input end successively then, each input terminal voltage of sampling, and correspondence obtains V1 after getting difference, V2 voltage.
Claims (6)
1. thermometry; It is characterized in that, with measuring resistance R2 with after temperature detecting resistance R3 connects, the voltage V1 at measurement standard resistance two ends and the voltage V2 at temperature detecting resistance two ends respectively; Then temperature detecting resistance R3=V2/V1*R2 obtains measured temperature according to temperature detecting resistance R3 resistance then.
2. a temperature measuring circuit is characterized in that, comprises a thermometric branch road that is connected on the direct supply, and this thermometric branch road comprises a measuring resistance and a pair of temperature detecting resistance access point of series connection; Circuit also comprises first SS, and each input end of first SS connects the two ends and the said temperature detecting resistance access point of said measuring resistance respectively, and the output terminal of first SS connects sampling apparatus.
3. circuit according to claim 2; It is characterized in that; Said sampling apparatus comprises an AD converter and a processor; The AD converter input end connects the output terminal of said first SS, the output terminal connection processing device of AD converter, said first SS of processor output control linkage.
4. circuit according to claim 2 is characterized in that, said thermometric branch road also comprises the current-limiting resistance that is connected in the branch road.
5. circuit according to claim 2; It is characterized in that; Circuit also comprises second SS that is used for one group of temperature detecting resistance is inserted respectively said thermometric branch road, corresponding each temperature detecting resistance that connects of the second SS input end, and output terminal connects said temperature detecting resistance access point.
6. according to claim 2 or 3 or 4 or 5 described circuit, it is characterized in that said temperature detecting resistance is a RTD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100263525A CN102809443A (en) | 2011-11-28 | 2012-02-07 | Method and circuit for measuring temperature |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110383079 | 2011-11-28 | ||
| CN201110383079.7 | 2011-11-28 | ||
| CN2012100263525A CN102809443A (en) | 2011-11-28 | 2012-02-07 | Method and circuit for measuring temperature |
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| CN102809443A true CN102809443A (en) | 2012-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012100263525A Pending CN102809443A (en) | 2011-11-28 | 2012-02-07 | Method and circuit for measuring temperature |
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| CN (1) | CN102809443A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104006903A (en) * | 2014-06-13 | 2014-08-27 | 四川亚美动力技术有限公司 | Method for detecting temperature sensor on engine inlet port |
| CN108151902A (en) * | 2017-12-13 | 2018-06-12 | 天津津航计算技术研究所 | Temperature collecting device and method based on platinum resistance |
| CN108363432A (en) * | 2018-05-09 | 2018-08-03 | 上海新型烟草制品研究院有限公司 | A kind of temprature control method of aerosol generating device, system, equipment, medium and temperature control panel |
| CN110220606A (en) * | 2019-06-24 | 2019-09-10 | 宁波华仪宁创智能科技有限公司 | Temperature measuring equipment and method with calibration function |
| CN111256864A (en) * | 2020-03-19 | 2020-06-09 | 上海卫星工程研究所 | Multipoint temperature measuring method and system based on serial connection of multiple thermistors |
| CN112304466A (en) * | 2020-10-20 | 2021-02-02 | 武汉智能装备工业技术研究院有限公司 | Multichannel scanning formula temperature measuring device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202582775U (en) * | 2011-11-28 | 2012-12-05 | 凯迈（洛阳）环测有限公司 | Temperature measuring circuit |
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2012
- 2012-02-07 CN CN2012100263525A patent/CN102809443A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202582775U (en) * | 2011-11-28 | 2012-12-05 | 凯迈（洛阳）环测有限公司 | Temperature measuring circuit |
Non-Patent Citations (2)
| Title |
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| 农莉云 等: "一种基于铂电阻传感器的测温和校准方法", 《装备制造技术》, 30 September 2010 (2010-09-30), pages 72 - 74 * |
| 杨杰 等: "《微型计算机原理及应用教程》", 31 August 1998, article "单片机对烘房多点温度检测电路系统", pages: 170 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104006903A (en) * | 2014-06-13 | 2014-08-27 | 四川亚美动力技术有限公司 | Method for detecting temperature sensor on engine inlet port |
| CN108151902A (en) * | 2017-12-13 | 2018-06-12 | 天津津航计算技术研究所 | Temperature collecting device and method based on platinum resistance |
| CN108363432A (en) * | 2018-05-09 | 2018-08-03 | 上海新型烟草制品研究院有限公司 | A kind of temprature control method of aerosol generating device, system, equipment, medium and temperature control panel |
| CN110220606A (en) * | 2019-06-24 | 2019-09-10 | 宁波华仪宁创智能科技有限公司 | Temperature measuring equipment and method with calibration function |
| CN111256864A (en) * | 2020-03-19 | 2020-06-09 | 上海卫星工程研究所 | Multipoint temperature measuring method and system based on serial connection of multiple thermistors |
| CN112304466A (en) * | 2020-10-20 | 2021-02-02 | 武汉智能装备工业技术研究院有限公司 | Multichannel scanning formula temperature measuring device |
| CN112304466B (en) * | 2020-10-20 | 2023-02-28 | 武汉微环控技术有限公司 | Multichannel scanning formula temperature measuring device |
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Application publication date: 20121205 |