CN203323910U - High-precision temperature signal measuring circuit - Google Patents
High-precision temperature signal measuring circuit Download PDFInfo
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- CN203323910U CN203323910U CN2013204049817U CN201320404981U CN203323910U CN 203323910 U CN203323910 U CN 203323910U CN 2013204049817 U CN2013204049817 U CN 2013204049817U CN 201320404981 U CN201320404981 U CN 201320404981U CN 203323910 U CN203323910 U CN 203323910U
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- temperature
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Abstract
The utility model relates to a temperature measuring circuit, and belongs to the technical field of electronics. The high-precision temperature signal measuring circuit is mainly characterized in that the output end of a constant current source is connected with the input end of a temperature signal detection circuit with a lead resistance inhibiting effect, the output end of the temperature signal detection circuit with the lead resistance inhibiting effect is connected with the input end of a subtracter through a signal amplifier, thereby being a minuend signal; the output end of a 0 DEG C reference voltage signal generating circuit is connected with another input end of the subtracter, thereby being a subtrahend signal; and voltage at the output end of the subtracter is V0. The high-precision temperature signal measuring circuit has the advantages that the temperature signal detection circuit with the lead resistance inhibiting effect is adopted by the detection circuit, thereby enabling influences of lead resistance during temperature measurement are removed; and the temperature measurement component adopts an operating mode of constant current, thereby being low in power loss. The finally obtained measurement voltage containing temperature variation information is in direct proportion to the change rate of resistance. The temperature measuring circuit provided by the utility model is very applicable to precise temperature measurement on the industrial site under the condition of having a long lead.
Description
Technical field:
The utility model relates to a kind of temperature measurement circuit, belongs to electronic technology field.
Background technology:
Temperature is for characterizing the physical quantity of the cold and hot degree of object, and it is the universal method of temperature detection that the serviceability temperature sensor coordinates electronic circuit to obtain temperature signal.But in using, the additive effect of often bringing because of lead resistance between the change-over circuit of temperature signal and the infield of temperature sensor probe makes actual measured value higher, and the lead-in wire of this temperature sensor is longer, and this impact is just more obvious.The Li Long of Sichuan University etc. in the thermometric bridge circuit, adopt single-chip microcomputer to realize temperature is measured comparatively accurately by computing the constant current source application of principle, but this temperature measuring equipment only limits to the shorter occasion of Pt100 platinum resistance sensor lead-in wire; Employing Nonlinear A/D the converters such as the long friend of the king of Dalian University Of Communications are realized the design proposal of linear compensation, the temperature instrumentation schematic diagram point of adjustment with three-wire system conductor resistance elimination function of its proposition is more, in practical operation, be difficult for holding, and its introduction optiamal linearization parameter and the computing method of maximum non-linearization error comparatively complicated, not representative.
Summary of the invention:
The purpose of this utility model is to avoid the defect of prior art, a kind of metering circuit that can obtain the high-precision temperature signal is proposed, by designing a kind of special circuit structure, eliminate the impact of the lead resistance of temperature sensor in common temperature measurement circuit on measuring-signal, improved thermometric accuracy.
The purpose of this utility model can be by realizing by the following technical solutions: a kind of high-precision temperature circuitry for signal measurement, its principal feature is to include the input end of temperature signal testing circuit of the output terminal connecting band lead resistance depression effect of constant current source generator, output terminal with the temperature signal testing circuit of lead resistance depression effect is connected with the input end of subtracter by signal amplifier, is the minuend signal; 0 ℃ of reference voltage signal produces another input end of output terminal connection subtracter of circuit, is the subtrahend signal, and the output end voltage of subtracter is V
0.
Described high-precision temperature circuitry for signal measurement, the output terminal 6 that described constant current source generator includes operational amplifier A 1 is connected with the positive input terminal 3 of operational amplifier A 2 by resistance R 5, the negative input end 2 of operational amplifier A 2 is connected with its output terminal 6, and the output terminal 6 of operational amplifier A 2 is connected with resistance R 4 one ends, resistance R 4 other ends are connected with resistance R 3 one ends, the other end of resistance R 3 is connected with reference voltage source Vref, resistance R 3 is joined with the connecting line of R4 and the positive input terminal 3 of operational amplifier A 1 simultaneously, the negative input end 2 of operational amplifier A 1 is by resistance R 1 ground connection, by resistance R 2, with its output terminal 6, be connected.
Described R1, R2, R3, R4 resistance equate.
Described high-precision temperature circuitry for signal measurement, the described testing circuit of the temperature signal with the lead resistance depression effect comprises and includes the three-wire type temperature sensor, resistance R 8 is the temperature sensor all-in resistance, RW1, RW2, RW3 is respectively three joint connection in site line resistances of described three-wire type temperature sensor, the end of the termination connecting line resistance R W2 of temperature sensor all-in resistance R8, the other end ground connection of connecting line resistance R W2, the other end of the all-in resistance R8 of temperature sensor is the end of connection resistance RW1 and RW3 in succession, the other end of connecting line resistance R W3 is connected with the positive input terminal 3 of operational amplifier A 3, simultaneously, the other end of connecting line resistance R W1 is connected with the positive input terminal 3 of operational amplifier A 2 with the connecting line of resistance R 6 one ends, the other end of resistance R 6 is connected with the negative input end 2 of operational amplifier A 3, and be connected with the output terminal 6 of operational amplifier A 3 by resistance R 7.
Described joint connection in site line resistance RW1, RW2, RW3 resistance equate.
Described high-precision temperature circuitry for signal measurement, described signal amplifier includes No. 3 input ends of the output terminal 6 connection amplifier A5 of operational amplifier A 3, between No. 8 ends of amplifier A5 and No. 1 end, is connected with enlargement factor controlling resistance R
G, No. 4 end ground connection that No. 2 ends of amplifier A5 connect; No. 6 end is the output terminal of amplifier A5.
Described high-precision temperature circuitry for signal measurement, described 0 ℃ of reference voltage signal produces circuit and includes adjustable potentiometer R9, the positive input terminal 3 of the adjustable end concatenation operation amplifier A4 of adjustable potentiometer R9, the negative input end 2 of operational amplifier A 4 is connected with output terminal 6, forms voltage follower.
Described high-precision temperature circuitry for signal measurement, the output terminal 6 that described subtracter includes amplifier A5 is connected with resistance R 10, the other end of resistance R 10 is connected with resistance R 11 1 ends, the other end ground connection of resistance R 11, resistance R 10 is connected with the positive input terminal 3 of operational amplifier A 6 with the connecting line of R11 simultaneously; The output terminal 6 of operational amplifier A 4 is connected with resistance R 12, the other end of resistance R 12 is connected with resistance R 13 1 ends, the other end of resistance R 13 is connected with the output terminal 6 of operational amplifier A 6, and resistance R 12 is connected with the negative input end 2 of operational amplifier A 6 with the connecting line of resistance R 13 simultaneously; The final voltage produced of output terminal 6 of operational amplifier A 6 is the measuring voltage V containing temperature information
0.
Described R10, R11, R12, R13 resistance equate.
The beneficial effects of the utility model are that testing circuit has adopted the temperature signal testing circuit with the lead resistance depression effect, make the lead resistance impact in temperature survey be eliminated, and temperature-measuring part adopts the working method of steady current, power attenuation is little, and the final measuring voltage containing temperature information obtained is directly proportional to the rate of change of resistance.This temperature measurement circuit is very suitable for being had than the precision temperature in the long lead situation and measuring in industry spot.
The accompanying drawing explanation:
Fig. 1 structured flowchart of the present utility model
The high-precision temperature circuitry for signal measurement figure of Fig. 2 based on the three-wire type temperature sensor.
Embodiment:
Below in conjunction with the most preferred embodiment shown in accompanying drawing, be described in further detail:
Embodiment 1: a kind of high-precision temperature circuitry for signal measurement, include the input end of temperature signal testing circuit 2 of the output terminal connecting band lead resistance depression effect of constant current source generator 1, output terminal with the temperature signal testing circuit 2 of lead resistance depression effect is connected with the input end of subtracter 5 by signal amplifier 4, is the minuend signal; 0 ℃ of reference voltage signal produces output terminal connection subtracter 5 another input ends of circuit 3, is the subtrahend signal, and the output end voltage of subtracter 5 is V
0.
The output terminal 6 that described constant current source generator 1 includes operational amplifier A 1 is connected with the positive input terminal 3 of operational amplifier A 2 by resistance R 5, the negative input end 2 of operational amplifier A 2 is connected with its output terminal 6, and the output terminal 6 of operational amplifier A 2 is connected with resistance R 4 one ends, resistance R 4 other ends are connected with resistance R 3 one ends, the other end of resistance R 3 is connected with reference voltage source Vref, resistance R 3 is joined with the positive input terminal 3 of operational amplifier A 1 with the connecting line of R4 simultaneously simultaneously, the negative input end 2 of operational amplifier A 1 is by resistance R 1 ground connection, by resistance R 2, with its output terminal 6, be connected.
Described R1, R2, R3, R4 resistance equate.
The described testing circuit of the temperature signal with the lead resistance depression effect 2 includes the three-wire type temperature sensor, resistance R 8 is the temperature sensor all-in resistance, RW1, RW2, RW3 is respectively three joint connection in site line resistances of described three-wire type temperature sensor, the end of the termination connecting line resistance R W2 of temperature sensor all-in resistance R8, the other end ground connection of connecting line resistance R W2, the other end of the all-in resistance R8 of temperature sensor is the end of connection resistance RW1 and RW3 in succession, the other end of connecting line resistance R W3 is connected with the positive input terminal 3 of operational amplifier A 3, simultaneously, the other end of connecting line resistance R W1 is connected with the positive input terminal 3 of operational amplifier A 2 with the connecting line of resistance R 6 one ends, the other end of resistance R 6 is connected with the negative input end 2 of operational amplifier A 3, and be connected with the output terminal 6 of operational amplifier A 3 by resistance R 7.
Described joint connection in site line resistance RW1, RW2, RW3 resistance equate.
Described signal amplifier 4 includes No. 3 input ends of the output terminal 6 connection amplifier A5 of operational amplifier A 3, between No. 8 ends of amplifier A5 and No. 1 end, is connected with enlargement factor controlling resistance R
G, No. 4 end ground connection that No. 2 ends of amplifier A5 connect; No. 6 end is the output terminal of amplifier A5.
Described 0 ℃ of reference voltage signal produces circuit 3 and includes adjustable potentiometer R9, the positive input terminal 3 of the adjustable end concatenation operation amplifier A4 of adjustable potentiometer R9, and the negative input end 2 of operational amplifier A 4 is connected with output terminal 6, forms voltage follower.
The output terminal 6 that described subtracter 5 includes amplifier A5 is connected with resistance R 10, and the other end of resistance R 10 is connected with resistance R 11 1 ends, the other end ground connection of resistance R 11, and resistance R 10 is connected with the positive input terminal 3 of operational amplifier A 6 with the connecting line of R11 simultaneously; The output terminal 6 of operational amplifier A 4 is connected with resistance R 12, the other end of resistance R 12 is connected with resistance R 13 1 ends, the other end of resistance R 13 is connected with the output terminal 6 of operational amplifier A 6, and resistance R 12 is connected with the negative input end 2 of operational amplifier A 6 with the connecting line of resistance R 13 simultaneously; The final voltage produced of output terminal 6 of operational amplifier A 6 is the measuring voltage V containing temperature information
0.
Described R10, R11, R12, R13 resistance equate.
Experimental example: select one group of design parameter to be: R1-R4 all selects the precision resistance of 100K/0.25W, and reference voltage source Vref selects 5.1V, and R5 selects the precision resistance of 5.1K/0.25W, and the electric current I that flows through resistance R 5 is the constant current source of 1mA; R6, R7 all select the precision resistance of 100K/0.25W, R8 selects the pt100 platinum resistance sensor, as the resistance that means this sensor with σ with respect to 0 ℃ of rate of change, the all-in resistance R8=100 (1+ σ) that pt100 platinum resistance sensor at certain temperature is arranged, during use, temperature sensor shown in R8 is positioned at the thermometric scene, and three connecting lines are drawn from its end, the temperature signal testing circuit by the access of the structure shown in Fig. 2 with the lead resistance depression effect; R
GSelect the precision resistance of 5.489K/0.25W, amplifier A5 selects AD620, and the enlargement factor of the signal amplifier 4 formed is 10; R9 selects the accurate adjustable potentiometer of the multi-turn of 100K/1W; R10-R13 all selects the precision resistance of 100K/0.25W; Reach-12V of reach-respectively select+12V of VCC of power supply+VCC; Operational amplifier A 1-A4, A6 all select OP07CP, as shown in Figure 2, adjust the sliding end of adjustable potentiometer R9, make adjustable terminal voltage=10*0.1=1.0V of adjustable potentiometer R9, thereby make V
0=10 σ, the i.e. final measuring voltage V containing temperature information of subtracter
0To the resistance change rate σ of pt100 platinum resistance sensor, be directly proportional.Due in-200 ℃～+ 600 ℃ scopes, the resistance variations of pt100 has the extraordinary linearity, be 0.3851%/℃, therefore, as long as can record V
0, just can be in the hope of the resistance change rate σ of pt100 platinum resistance sensor, thus can be in the hope of the degree of 0 ℃ of measurement point temperature departure, can be in the hope of the Celsius temperature t value of tested point.If this circuit records V constantly
0=6.22V, can be in the hope of σ=62.2%, historical facts or anecdotes border temperature t=σ/0.3851%/℃=62.2%/0.3851%/℃=161.52 ℃; And for example certain records V constantly
0=-1.4V, can be in the hope of σ=-14%, historical facts or anecdotes border temperature t=σ/0.3851%/℃=-14%/0.3851%/℃=-36.35 ℃.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (9)
1. a high-precision temperature circuitry for signal measurement, it is characterized in that including the input end of temperature signal testing circuit of the output terminal connecting band lead resistance depression effect of constant current source generator, output terminal with the temperature signal testing circuit of lead resistance depression effect is connected with the input end of subtracter by signal amplifier, is the minuend signal; 0 ℃ of reference voltage signal produces another input end of output terminal connection subtracter of circuit, is the subtrahend signal, and the output end voltage of subtracter is V
0.
2. high-precision temperature circuitry for signal measurement as claimed in claim 1, it is characterized in that the output terminal 6 that described constant current source generator includes operational amplifier A 1 is connected with the positive input terminal 3 of operational amplifier A 2 by resistance R 5, the negative input end 2 of operational amplifier A 2 is connected with its output terminal 6, and the output terminal 6 of operational amplifier A 2 is connected with resistance R 4 one ends, resistance R 4 other ends are connected with resistance R 3 one ends, the other end of resistance R 3 is connected with reference voltage source Vref, resistance R 3 is joined with the connecting line of R4 and the positive input terminal 3 of operational amplifier A 1 simultaneously, the negative input end 2 of operational amplifier A 1 is by resistance R 1 ground connection, by resistance R 2, with its output terminal 6, be connected.
3. high-precision temperature circuitry for signal measurement as claimed in claim 2, is characterized in that described R1, R2, R3, R4 resistance equate.
4. high-precision temperature circuitry for signal measurement as claimed in claim 1, it is characterized in that the described testing circuit of the temperature signal with the lead resistance depression effect includes the three-wire type temperature sensor, resistance R 8 is the temperature sensor all-in resistance, RW1, RW2, RW3 is respectively three joint connection in site line resistances of described three-wire type temperature sensor, the end of the termination connecting line resistance R W2 of temperature sensor all-in resistance R8, the other end ground connection of connecting line resistance R W2, the other end of the all-in resistance R8 of temperature sensor is the end of connection resistance RW1 and RW3 in succession, the other end of connecting line resistance R W3 is connected with the positive input terminal 3 of operational amplifier A 3, simultaneously, the other end of connecting line resistance R W1 is connected with the positive input terminal 3 of operational amplifier A 2 with the connecting line of resistance R 6 one ends, the other end of resistance R 6 is connected with the negative input end 2 of operational amplifier A 3, and be connected with the output terminal 6 of operational amplifier A 3 by resistance R 7.
5. high-precision temperature circuitry for signal measurement as claimed in claim 4, is characterized in that described joint connection in site line resistance RW1, RW2, RW3 resistance equate.
6. high-precision temperature circuitry for signal measurement as claimed in claim 1, it is characterized in that described signal amplifier includes No. 3 input ends of the output terminal 6 connection amplifier A5 of operational amplifier A 3, is connected with enlargement factor controlling resistance R between No. 8 ends of amplifier A5 and No. 1 end
G, No. 4 end ground connection that No. 2 ends of amplifier A5 connect; No. 6 end is the output terminal of amplifier A5.
7. high-precision temperature circuitry for signal measurement as claimed in claim 1, it is characterized in that described 0 ℃ of reference voltage signal produces circuit and includes adjustable potentiometer R9, the positive input terminal 3 of the adjustable end concatenation operation amplifier A4 of adjustable potentiometer R9, the negative input end 2 of operational amplifier A 4 is connected with output terminal 6, forms voltage follower.
8. high-precision temperature circuitry for signal measurement as claimed in claim 1, it is characterized in that the output terminal 6 that described subtracter includes amplifier A5 is connected with resistance R 10, the other end of resistance R 10 is connected with resistance R 11 1 ends, the other end ground connection of resistance R 11, resistance R 10 is connected with the positive input terminal 3 of operational amplifier A 6 with the connecting line of R11 simultaneously; The output terminal 6 of operational amplifier A 4 is connected with resistance R 12, the other end of resistance R 12 is connected with resistance R 13 1 ends, the other end of resistance R 13 is connected with the output terminal 6 of operational amplifier A 6, and resistance R 12 is connected with the negative input end 2 of operational amplifier A 6 with the connecting line of resistance R 13 simultaneously; The final voltage produced of output terminal 6 of operational amplifier A 6 is the measuring voltage V containing temperature information
0.
9. high-precision temperature circuitry for signal measurement as claimed in claim 8, is characterized in that described R10, R11, R12, R13 resistance equate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013204049817U CN203323910U (en) | 2013-07-08 | 2013-07-08 | High-precision temperature signal measuring circuit |
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| CN2013204049817U CN203323910U (en) | 2013-07-08 | 2013-07-08 | High-precision temperature signal measuring circuit |
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| CN2013204049817U Expired - Fee Related CN203323910U (en) | 2013-07-08 | 2013-07-08 | High-precision temperature signal measuring circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614589A (en) * | 2015-01-19 | 2015-05-13 | 浙江中控自动化仪表有限公司 | Lead-resistance-removed resistance signal source and resistance measuring circuit thereof |
| CN105738004A (en) * | 2014-12-10 | 2016-07-06 | 中车大连电力牵引研发中心有限公司 | Temperature measurement method and circuit |
| CN106248240A (en) * | 2016-08-15 | 2016-12-21 | 成都众山科技有限公司 | A kind of temperature transmitter with temperature-compensating |
| CN107560762A (en) * | 2017-09-06 | 2018-01-09 | 阳光电源股份有限公司 | A kind of PT100 resistance temperature measurements method and system |
| CN108318531A (en) * | 2018-03-20 | 2018-07-24 | 淮阴工学院 | The portable PH meters that a kind of included water bath with thermostatic control and form are shown |
| CN111238673A (en) * | 2020-01-06 | 2020-06-05 | 宁波中车时代传感技术有限公司 | Measuring circuit of film temperature sensor |
| CN111521285A (en) * | 2020-04-30 | 2020-08-11 | 深圳芯能半导体技术有限公司 | High-voltage integrated circuit and temperature detection circuit thereof |
-
2013
- 2013-07-08 CN CN2013204049817U patent/CN203323910U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738004A (en) * | 2014-12-10 | 2016-07-06 | 中车大连电力牵引研发中心有限公司 | Temperature measurement method and circuit |
| CN104614589A (en) * | 2015-01-19 | 2015-05-13 | 浙江中控自动化仪表有限公司 | Lead-resistance-removed resistance signal source and resistance measuring circuit thereof |
| CN104614589B (en) * | 2015-01-19 | 2017-07-28 | 浙江中控自动化仪表有限公司 | Resistance signal source and its resistance measuring circuit that a kind of lead resistance is eliminated |
| CN106248240A (en) * | 2016-08-15 | 2016-12-21 | 成都众山科技有限公司 | A kind of temperature transmitter with temperature-compensating |
| CN106248240B (en) * | 2016-08-15 | 2018-12-11 | 成都众山科技有限公司 | A kind of temperature transmitter with temperature-compensating |
| CN107560762A (en) * | 2017-09-06 | 2018-01-09 | 阳光电源股份有限公司 | A kind of PT100 resistance temperature measurements method and system |
| CN108318531A (en) * | 2018-03-20 | 2018-07-24 | 淮阴工学院 | The portable PH meters that a kind of included water bath with thermostatic control and form are shown |
| CN111238673A (en) * | 2020-01-06 | 2020-06-05 | 宁波中车时代传感技术有限公司 | Measuring circuit of film temperature sensor |
| CN111521285A (en) * | 2020-04-30 | 2020-08-11 | 深圳芯能半导体技术有限公司 | High-voltage integrated circuit and temperature detection circuit thereof |
| CN111521285B (en) * | 2020-04-30 | 2022-01-14 | 深圳芯能半导体技术有限公司 | High-voltage integrated circuit and temperature detection circuit thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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