CN103278257B - Non-linear platinum resistor correction temperature transmission circuit - Google Patents

Non-linear platinum resistor correction temperature transmission circuit Download PDF

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Publication number
CN103278257B
CN103278257B CN201310145658.7A CN201310145658A CN103278257B CN 103278257 B CN103278257 B CN 103278257B CN 201310145658 A CN201310145658 A CN 201310145658A CN 103278257 B CN103278257 B CN 103278257B
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China
Prior art keywords
temperature
resistance
bridge
platinum
resistor
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CN201310145658.7A
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Chinese (zh)
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CN103278257A (en
Inventor
陈玉伟
麻吉南
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青岛航天半导体研究所有限公司
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Abstract

The invention relates to a non-linear platinum resistor correction temperature transmission circuit, which comprises a temperature-measuring bridge and a programmable gain amplifier PGA, the negative end of the power supply of the temperature-measuring bridge is connected with the signal earth through a common-mode matching resistor Rc, the output end of the temperature-measuring bridge is connected with the input end of the programmable gain amplifier PGA, a non-linear compensation resistor Rf is connected between the positive input end and output end of the programmable gain amplifier PGA, and thereby positive feedback is generated; and the temperature-measuring bridge is a single-arm bridge with a platinum resistor RT as one arm of the bridge. Since the non-linear platinum resistor correction temperature transmission circuit adopts the common-mode matching resistor and the non-linear compensation resistor, the resistance of the platinum resistor, which changes along with temperature, is converted into a voltage signal by the temperature-measuring bridge and the programmable gain amplifier, a linear hardware correction method is utilized, zero and full scale are digitally regulated, consequently, the defects of debugging errors and poor stability caused by a potentiometer or a resistor are prevented, and low-cost and high-precision temperature measurement is realized.

Description

Non-linear platinum resistor correction temperature transmission circuit
Technical field
The present invention relates to detection technique and automatic control technology field, specifically, are related to a kind of temperature transmission circuit.
Background technology
Temperature is an important physical amount for being related to industrial and agricultural production, scientific research, environmental protection, meteorology or even daily life how Realize that accurate measurement tool has very important significance.Particularly it is used for the temperature instrumentation of process industrial, even more requires temperature measurement accuracy High, good reliability, but also the characteristics of to have low cost.
Conventional temperature transmitter is all realized using analogue technique and singlechip technology, using the temperature of analogue technique Degree transmitter, although cost is not high, due to being to use potentiometer(Or resistor)To adjust zero-bit and full scale, therefore it is difficult to reach Can drift about with the time to high adjustment accuracy, and potentiometer, reliability and stability are all bad, the result directly brought is Certainty of measurement is difficult to improve;Non-liner revision is carried out with software using the temperature transmitter of singlechip technology, zero-bit and full scale are used Software is adjusted, and certainty of measurement is high, good reliability, but relatively costly, is unfavorable for batch production, and application is restricted.
At present, platinum resistance is temperature sensor the most frequently used in industrial processes.Platinum resistance has measurement range width, essence The features such as degree height, good stability and resistance to oxidation, therefore, obtain application widely in middle low-temperature space.
The formula that the relation that platinum resistance is varied with temperature is deferred to is:
Rt=R0[1+At+Bt2+Ct3(t-100)] -200 DEG C~0 DEG C
Rt=R0(1+At+Bt2) 0 DEG C~600 DEG C
In formula,
RtFor resistance value of the platinum resistive element in temperature t;
R0The resistance value for being platinum resistive element at 0 DEG C;
A, B, C are indexing constant;
T is measured medium temperature.
It can be seen that there is non-linear relation between the resistance and temperature of platinum resistance, in the application of platinum sensor During, generally the resistance variations of platinum sensor are changed into voltage using unbalance bridge circuit, when platinum resistance is connect After entering bridge for measuring temperature circuit, due to there is non-linear relation, the voltage of electric bridge output between arm resistance and bridge output voltage Can also increase with the nonlinear degree of temperature, the non-linear and uneven bridge for measuring temperature unintentional nonlinearity of platinum resistance is surveyed to temperature Amount brings very big nonlinearity erron.Therefore, it is necessary to carry out non-liner revision to it.
The content of the invention
The present invention for the nonlinearity erron that exists during existing temperature transmitter thermometric it is big, on precision is low, stability is poor etc. State problem, there is provided a kind of nonlinearity erron is little, certainty of measurement is high, the platinum resistance non-liner revision temperature of good stability, low cost Degree transmission circuit.
Technical scheme:A kind of non-linear platinum resistor correction temperature transmission circuit, including bridge for measuring temperature and can compile Journey gain amplifier PGA, the power supply negative terminal of bridge for measuring temperature passes through common mode build-out resistor Rc and is signally connected, bridge for measuring temperature Outfan be connected with the input of programmable gain amplifier PGA, the input positive terminal of programmable gain amplifier PGA is defeated with it Go out between end and be connected to nonlinear compensation resistance Rf, form positive feedback;Bridge for measuring temperature be by platinum resistance RT as the arm of bridge one list Arm electric bridge.
Preferably, described temperature transmission circuit also includes V/I change-over circuits, and the power supply of bridge for measuring temperature is just terminated In the reference voltage terminal of V/I change-over circuits, the outfan of programmable gain amplifier PGA connects with the input of V/I change-over circuits Connect.
Preferably, described temperature transmission circuit also includes excitation voltage source Vr, and excitation voltage source Vr is connected on thermometric electricity The power supply anode of bridge.
Preferably, described platinum resistance RT is using two-wire system or three-wire system platinum resistance.
Preferably, programmable gain amplifier PGA adopts adjustable zero position, the programmable gain amplifier of full scale.
Beneficial effects of the present invention:The method that the present invention is linearly corrected using hardware, with numeral adjustment zero-bit and full scale, keeps away Exempt from the shortcoming of the next debugging error of potentiometer or resistor and stability difference, realize inexpensive, high-precision temperature survey; Bridge for measuring temperature power supply negative terminal passes through common mode build-out resistor Rc and is signally connected, and makes programmable gain amplifier for thermometric The signal amplification of resistance is possibly realized, and non-linear benefit is connected between the input positive terminal of programmable gain amplifier and its outfan Resistance Rf is repaid, the resistance value nonlinear change signal for varying with temperature amplifies through programmable gain amplifier, the one of its output Part Jing nonlinear compensation resistance Rf feed back to the input positive terminal of programmable gain amplifier, then with temperature detecting resistance Signal averaging after The non-liner revision of temperature detecting resistance is realized, as long as the range of temperature detecting resistance determines, it is possible to see range by zeroing position and full scale Whether the error of midpoint output signal is minimum, it is determined that the size of compensation resistance, i.e., non-linear in the case where other specification is constant Compensation resistance is only relevant with range, it is easy to produces in batches, can accomplish nonlinearity erron≤0.025%FS.Temperature detecting resistance is to criticize temperature The resistor of degree coefficient.The present invention using platinum resistance as temperature detecting resistance, in the temperature-measuring range of platinum resistance be capable of achieving low cost, High-precision temperature survey.
Description of the drawings
Accompanying drawing 1 is the circuit theory diagrams of the specific embodiment of the invention one.
Accompanying drawing 2 is the circuit theory diagrams of the specific embodiment of the invention two.
Specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Embodiment 1:As shown in figure 1, a kind of non-linear platinum resistor correction temperature transmission circuit, including bridge for measuring temperature, can compile Journey gain amplifier PGA and V/I change-over circuit, the power supply of bridge for measuring temperature is just terminating at the reference voltage of V/I change-over circuits End, is powered by V/I change-over circuits for bridge for measuring temperature, and the power supply negative terminal of bridge for measuring temperature is by common mode build-out resistor Rc and signal Ground connection, make programmable gain amplifier PGA for temperature detecting resistance signal amplify be possibly realized, the outfan of bridge for measuring temperature with The input connection of programmable gain amplifier PGA, the outfan of programmable gain amplifier PGA is defeated with V/I change-over circuits Enter end connection;Nonlinear compensation resistance Rf is connected between the input positive terminal of programmable gain amplifier PGA and its outfan, is formed Positive feedback, realizes nonlinear compensation function.Bridge for measuring temperature be by platinum resistance RT as the arm of bridge one wheatstone bridge, using platinum Resistance RT realizes inexpensive, high-precision temperature survey as temperature detecting resistance in the temperature-measuring range of platinum resistance.
Above-mentioned platinum resistance RT is using two-wire system or three-wire system platinum resistance.
Programmable gain amplifier PGA while realizing being amplified the signal of platinum resistance RT, in order to realize zero-bit And the numeral adjustment of full scale, above-mentioned programmable gain amplifier PGA is using adjustable zero position, the programmable gain amplifier of full scale.
The output current of above-mentioned V/I change-over circuits is 4mA-20mA.
The resistance value of common mode build-out resistor Rc sees the output letter of programmable gain amplifier PGA by adjustment zero-bit, full scale Whether number normally selecting, generally its resistance value is greater than marginal value.
Whether the resistance value of nonlinear compensation resistance Rf sees the signal errors value at range midpoint by adjustment zero-bit, full scale Determining, resistance value at this moment is the nonlinear compensation resistance value under the range to minimum.
Using the platinum resistance non-liner revision temperature transmitter of the present embodiment non-linear platinum resistor correction temperature transmission circuit, Replace the result of platinum resistance test, its maximum error≤0.025%FS with resistance box in the range of 0 DEG C -100 DEG C.
The present embodiment non-linear platinum resistor correction temperature transmission circuit is applied to current output type temperature transmitter.
Operation principle:V/I change-over circuits are powered for bridge for measuring temperature, and by common mode build-out resistor Rc programmable automation controller is made Device PGA realizes the non-liner revision of platinum resistance RT thermometric, the signal of the resistance value nonlinear change that platinum resistance RT is varied with temperature Jing programmable gain amplifiers PGA amplifies, the non-linear benefits of a part of nonlinear properties Jing of programmable gain amplifier PGA outputs Repay the input positive terminal that resistance Rf feeds back to programmable gain amplifier PGA, then with platinum resistance RT Signal averaging after realize platinum resistance The non-liner revision of RT.
Embodiment 2:As shown in Fig. 2 a kind of non-linear platinum resistor correction temperature transmission circuit, including bridge for measuring temperature, can compile Journey gain amplifier PGA and excitation voltage source, the power supply anode of bridge for measuring temperature is connected with excitation voltage source, by driving voltage Source powers for bridge for measuring temperature, and the power supply negative terminal of bridge for measuring temperature passes through common mode build-out resistor Rc and is signally connected, and makes to compile Journey gain amplifier PGA is used for the signal amplification of temperature detecting resistance and is possibly realized, and outfan and the programmable-gain of bridge for measuring temperature are put The input connection of big device PGA;Nonlinear compensation is connected between the input positive terminal of programmable gain amplifier PGA and its outfan Resistance Rf, forms positive feedback, realizes nonlinear compensation function.Bridge for measuring temperature be by platinum resistance RT as the arm of bridge one single armed Electric bridge, using platinum resistance RT as temperature detecting resistance, inexpensive, high-precision temperature is realized in the temperature-measuring range of platinum resistance and is surveyed Amount.
Above-mentioned platinum resistance RT is using two-wire system or three-wire system platinum resistance.
Programmable gain amplifier PGA while realizing being amplified the signal of platinum resistance RT, in order to realize zero-bit And the numeral adjustment of full scale, above-mentioned programmable gain amplifier PGA is using adjustable zero position, the programmable gain amplifier of full scale.
The resistance value of common mode build-out resistor Rc sees the output letter of programmable gain amplifier PGA by adjustment zero-bit, full scale Whether number normally selecting, generally its resistance value is greater than marginal value.
Whether the resistance value of nonlinear compensation resistance Rf sees the signal errors value at range midpoint by adjustment zero-bit, full scale Determining, resistance value at this moment is the nonlinear compensation resistance value under the range to minimum.
Using the platinum resistance non-liner revision temperature transmitter of the present embodiment non-linear platinum resistor correction temperature transmission circuit, Replace the result of platinum resistance test, its maximum error≤0.025%FS with resistance box in the range of 0 DEG C -100 DEG C.
The present embodiment non-linear platinum resistor correction temperature transmission circuit is applied to output voltage type temperature transmitter.
Operation principle:Excitation voltage source is powered for bridge for measuring temperature, and by common mode build-out resistor Rc programmable automation controller is made Device PGA realizes the non-liner revision of platinum resistance RT thermometric, the signal of the resistance value nonlinear change that platinum resistance RT is varied with temperature Jing programmable gain amplifiers PGA amplifies, the non-linear benefits of a part of nonlinear properties Jing of programmable gain amplifier PGA outputs Repay the input positive terminal that resistance Rf feeds back to programmable gain amplifier PGA, then with platinum resistance RT Signal averaging after realize platinum resistance The non-liner revision of RT.
It is more than the ultimate principle and feature of the present invention, the specific embodiment of the invention can not be only limitted to this, for one's own profession For the technical staff of industry, on the premise of without departing from thinking of the present invention, other similar changes can be also made, and this all should be regarded Protection domain required by claims of the present invention.

Claims (4)

1. a kind of non-linear platinum resistor correction temperature transmission circuit, it is characterised in that:Put including bridge for measuring temperature and programmable-gain Big device PGA, the power supply negative terminal of bridge for measuring temperature passes through common mode build-out resistor Rc and is signally connected, the outfan of bridge for measuring temperature It is connected with the input of programmable gain amplifier PGA, between the input positive terminal of programmable gain amplifier PGA and its outfan Nonlinear compensation resistance Rf is connected to, positive feedback is formed;Bridge for measuring temperature be by platinum resistance RT as the arm of bridge one wheatstone bridge;Platinum The signal Jing programmable gain amplifiers PGA of the resistance value nonlinear change that resistance RT is varied with temperature amplifies, programmable-gain A part of nonlinear properties Jing nonlinear compensations resistance Rf of amplifier PGA outputs feeds back to programmable gain amplifier PGA's Input positive terminal, then with platinum resistance RT Signal averaging after realize the non-liner revision of platinum resistance RT;Described programmable automation controller Device PGA adopts adjustable zero position, the programmable gain amplifier of full scale, the resistance value of common mode build-out resistor Rc by adjustment zero-bit, Full scale, sees the output signal of programmable gain amplifier PGA whether normally selecting, and its resistance value is more than marginal value, non-linear The resistance value of compensation resistance Rf by adjustment zero-bit, full scale, see the signal errors value at range midpoint whether minimum determining, signal Resistance value when error amount is minimum is the nonlinear compensation resistance value under the range.
2. non-linear platinum resistor correction temperature transmission circuit according to claim 1, it is characterised in that:Described temperature becomes Power transmission road also includes V/I change-over circuits, and the power supply of bridge for measuring temperature is just terminating at the reference voltage terminal of V/I change-over circuits, can The outfan of programming gain amplifier PGA is connected with the input of V/I change-over circuits.
3. non-linear platinum resistor correction temperature transmission circuit according to claim 1, it is characterised in that:Described temperature becomes Power transmission road also includes excitation voltage source Vr, and excitation voltage source Vr is connected on the power supply anode of bridge for measuring temperature.
4. non-linear platinum resistor correction temperature transmission circuit according to claim 1, it is characterised in that:Described platinum resistance RT is using two-wire system or three-wire system platinum resistance.
CN201310145658.7A 2013-04-24 2013-04-24 Non-linear platinum resistor correction temperature transmission circuit CN103278257B (en)

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CN104482947B (en) * 2014-12-26 2017-01-04 镇江中煤电子有限公司 Mining Multiple typed sensor signal transmitting circuit
CN104868856B (en) * 2015-05-28 2018-03-23 北京凌阳益辉科技有限公司 A kind of non-linear feedback circuit and integrated amplifier
CN105157867A (en) * 2015-08-27 2015-12-16 成都众山科技有限公司 Temperature transmitter for thermal resistance detection
CN105181167A (en) * 2015-08-27 2015-12-23 成都众山科技有限公司 Temperature transmitter circuit capable of improving stability of output current
CN105510380A (en) * 2015-12-02 2016-04-20 上海仪电科学仪器股份有限公司 Temperature titration device
CN110333002A (en) * 2019-06-24 2019-10-15 青岛航天半导体研究所有限公司 Platinum resistance temperature sensor isolating amplifier circuit and adjustment method

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