CN103278257A - 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
CN103278257A
CN103278257A CN2013101456587A CN201310145658A CN103278257A CN 103278257 A CN103278257 A CN 103278257A CN 2013101456587 A CN2013101456587 A CN 2013101456587A CN 201310145658 A CN201310145658 A CN 201310145658A CN 103278257 A CN103278257 A CN 103278257A
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temperature
bridge
gain amplifier
programmable gain
transmission circuit
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CN103278257B (en
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陈玉伟
麻吉南
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QINGDAO AEROSPACE SEMICONDUCTOR RESEARCH INSTITUTE Co Ltd
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QINGDAO AEROSPACE SEMICONDUCTOR RESEARCH INSTITUTE Co Ltd
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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

The non-linear correction temperature of platinum resistance transmission circuit
Technical field
The present invention relates to detection technique and automatic control technology field, specifically, relate to a kind of temperature transmission circuit.
Background technology
Temperature relates to an important physical amount of industrial and agricultural production, scientific research, environmental protection, meteorology and even daily life, how to realize measuring accurately tool and has very important significance.Especially for the temperature instrumentation of process industrial, require temperature measurement accuracy height, good reliability especially, but also the low characteristics of cost will be arranged.
Temperature transmitter in the past all adopts analogue technique and singlechip technology to realize, adopt the temperature transmitter of analogue technique, although cost is not high, but owing to be to use potentiometer (or resistor) to adjust zero-bit and full scale, therefore be difficult to the adjustment accuracy that reaches high, and potentiometer can drift about in time, and reliability and stability are all bad, and the result who directly brings is that measuring accuracy is difficult to improve; Adopt the temperature transmitter of singlechip technology to carry out non-linear correction with software, the software adjustment of zero-bit and full scale, measuring accuracy height, good reliability, but cost is higher, is unfavorable for producing in batches, and application is restricted.
At present, platinum resistance is temperature sensor the most frequently used in the industrial processes.Therefore characteristics such as platinum resistance has that measurement range is wide, precision is high, good stability and resistance to oxidation, have obtained using very widely at middle low-temperature space.
The formula that the temperature variant relation of platinum resistance is deferred to is:
R t=R 0[1+A t+Bt 2+Ct 3(t-100)]-200℃~0℃
R t=R 0(1+At+Bt 2)0℃~600℃
In the formula,
R tBe the resistance value of platinum resistance element when the temperature t;
R 0Be the resistance value of platinum resistance element 0 ℃ the time;
A, B, C are the calibration constant;
T is the measured medium temperature.
This shows between the resistance of platinum resistance and the temperature and have nonlinear relationship, in the application process of platinum sensor, usually utilize unbalance bridge circuit that the resistance variations of platinum sensor is changed into voltage, after platinum resistance is inserted the bridge for measuring temperature circuit, owing to have nonlinear relationship between arm resistance and the bridge output voltage, the voltage of electric bridge output and the nonlinear degree of temperature also can strengthen, and the non-linear and uneven bridge for measuring temperature unintentional nonlinearity of platinum resistance is brought very big nonlinearity erron to temperature survey.Therefore, be necessary it is carried out non-linear correction.
Summary of the invention
Big, the problems referred to above such as precision is low, poor stability of nonlinearity erron that exist when the present invention is directed to existing temperature transmitter thermometric provide that a kind of nonlinearity erron is little, measuring accuracy is high, good stability, the non-linear correction temperature of platinum resistance transmission circuit that cost is low.
Technical scheme of the present invention: the non-linear correction temperature of a kind of platinum resistance transmission circuit, comprise bridge for measuring temperature and programmable gain amplifier PGA, the power supply negative terminal of bridge for measuring temperature is connected with signal ground by common mode build-out resistor Rc, the output terminal of bridge for measuring temperature is connected with the input end of programmable gain amplifier PGA, be connected to the nonlinear compensation resistance R _ f between the input anode of programmable gain amplifier PGA and its output terminal, form positive feedback; Bridge for measuring temperature is by the wheatstone bridge of platinum resistance RT as bridge circuit one arm.
Preferably, described temperature transmission circuit also comprises the V/I change-over circuit, and the power supply of bridge for measuring temperature is just terminating at the reference voltage terminal of V/I change-over circuit, and the output terminal of programmable gain amplifier PGA is connected with the input end of V/I change-over circuit.
Preferably, described temperature transmission circuit also comprises excitation voltage source Vr, and excitation voltage source Vr is connected on the power supply anode of bridge for measuring temperature.
Preferably, described platinum resistance RT adopts two-wire system or three-wire system platinum resistance.
Preferably, programmable gain amplifier PGA adopts the programmable gain amplifier of adjustable zero-bit, full scale.
Beneficial effect of the present invention: the present invention utilizes the linear method of revising of hardware, adjusts zero-bit and full scale with numeral, has avoided the shortcoming of the debugging sum of errors poor stability that potentiometer or resistance brings, and has realized low-cost, high-precision temperature survey; Bridge for measuring temperature power supply negative terminal is connected with signal ground by common mode build-out resistor Rc, the signal that makes programmable gain amplifier be used for temperature detecting resistance amplifies and becomes possibility, and be connected to the nonlinear compensation resistance R _ f between the input anode of programmable gain amplifier and its output terminal, temperature variant resistance value nonlinearities change signal amplifies through programmable gain amplifier, the part of its output feeds back to the input anode of programmable gain amplifier through the nonlinear compensation resistance R _ f, realize the non-linear correction of temperature detecting resistance again with temperature detecting resistance signal stack back, as long as the range of temperature detecting resistance is determined, just can see whether the error of range mid point output signal is minimum by zeroing position and full scale, determine the size of compensating resistance, namely under the situation of other parameter constants, nonlinear compensation resistance is only relevant with range, be easy to produce in batches, can accomplish nonlinearity erron≤0.025%FS.Temperature detecting resistance refers to the resistor of positive temperature coefficient (PTC).The present invention adopts platinum resistance as temperature detecting resistance, can realize low cost, high-precision temperature survey in the temperature-measuring range of platinum resistance.
Description of 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.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
Embodiment 1: as shown in Figure 1, the non-linear correction temperature of a kind of platinum resistance transmission circuit, comprise bridge for measuring temperature, programmable gain amplifier PGA and V/I change-over circuit, the power supply of bridge for measuring temperature is just terminating at the reference voltage terminal of V/I change-over circuit, be bridge for measuring temperature power supply by the V/I change-over circuit, the power supply negative terminal of bridge for measuring temperature is connected with signal ground by common mode build-out resistor Rc, the signal that makes programmable gain amplifier PGA be used for temperature detecting resistance amplifies and becomes possibility, the output terminal of bridge for measuring temperature is connected with the input end of programmable gain amplifier PGA, and the output terminal of programmable gain amplifier PGA is connected with the input end of V/I change-over circuit; Be connected to the nonlinear compensation resistance R _ f between the input anode of programmable gain amplifier PGA and its output terminal, form positive feedback, realized the nonlinear compensation function.Bridge for measuring temperature is by the wheatstone bridge of platinum resistance RT as bridge circuit one arm, adopts platinum resistance RT as temperature detecting resistance, has realized low-cost, high-precision temperature survey in the temperature-measuring range of platinum resistance.
Above-mentioned platinum resistance RT adopts two-wire system or three-wire system platinum resistance.
Programmable gain amplifier PGA is when realizing that signal to platinum resistance RT amplifies, and in order to realize the numeral adjustment of zero-bit and full scale, above-mentioned programmable gain amplifier PGA adopts the programmable gain amplifier of adjustable zero-bit, full scale.
The output current of above-mentioned V/I change-over circuit is 4mA-20mA.
The resistance value of common mode build-out resistor Rc sees by adjusting zero-bit, full scale whether the output signal of programmable gain amplifier PGA is normally selected, and its resistance value is greater than critical value usually.
The resistance value of nonlinear compensation resistance R _ f sees by adjusting zero-bit, full scale whether the signal errors value of range mid point is minimum next definite, and resistance value at this moment is the nonlinear compensation resistance value under this range.
Adopt the non-linear correction temperature transmitter of platinum resistance of the non-linear correction temperature of present embodiment platinum resistance transmission circuit, in 0 ℃ of-100 ℃ of scope, replace the result of platinum resistance test with resistance box, its maximum error≤0.025%FS.
The non-linear correction temperature of present embodiment platinum resistance transmission circuit is applicable to the current output type temperature transmitter.
Principle of work: the V/I change-over circuit is the bridge for measuring temperature power supply, make programmable gain amplifier PGA realize the non-linear correction of platinum resistance RT thermometric by common mode build-out resistor Rc, the signal of the temperature variant resistance value nonlinearities change of platinum resistance RT amplifies through programmable gain amplifier PGA, a part of nonlinear properties of programmable gain amplifier PGA output feed back to the input anode of programmable gain amplifier PGA through the nonlinear compensation resistance R _ f, realize the non-linear correction of platinum resistance RT again with platinum resistance RT signal stack back.
Embodiment 2: as shown in Figure 2, the non-linear correction temperature of a kind of platinum resistance transmission circuit, comprise bridge for measuring temperature, programmable gain amplifier PGA and excitation voltage source, the power supply anode of bridge for measuring temperature is connected with excitation voltage source, be bridge for measuring temperature power supply by excitation voltage source, the power supply negative terminal of bridge for measuring temperature is connected with signal ground by common mode build-out resistor Rc, the signal that makes programmable gain amplifier PGA be used for temperature detecting resistance amplifies and becomes possibility, and the output terminal of bridge for measuring temperature is connected with the input end of programmable gain amplifier PGA; Be connected to the nonlinear compensation resistance R _ f between the input anode of programmable gain amplifier PGA and its output terminal, form positive feedback, realized the nonlinear compensation function.Bridge for measuring temperature is by the wheatstone bridge of platinum resistance RT as bridge circuit one arm, adopts platinum resistance RT as temperature detecting resistance, has realized low-cost, high-precision temperature survey in the temperature-measuring range of platinum resistance.
Above-mentioned platinum resistance RT adopts two-wire system or three-wire system platinum resistance.
Programmable gain amplifier PGA is when realizing that signal to platinum resistance RT amplifies, and in order to realize the numeral adjustment of zero-bit and full scale, above-mentioned programmable gain amplifier PGA adopts the programmable gain amplifier of adjustable zero-bit, full scale.
The resistance value of common mode build-out resistor Rc sees by adjusting zero-bit, full scale whether the output signal of programmable gain amplifier PGA is normally selected, and its resistance value is greater than critical value usually.
The resistance value of nonlinear compensation resistance R _ f sees by adjusting zero-bit, full scale whether the signal errors value of range mid point is minimum next definite, and resistance value at this moment is the nonlinear compensation resistance value under this range.
Adopt the non-linear correction temperature transmitter of platinum resistance of the non-linear correction temperature of present embodiment platinum resistance transmission circuit, in 0 ℃ of-100 ℃ of scope, replace the result of platinum resistance test with resistance box, its maximum error≤0.025%FS.
The non-linear correction temperature of present embodiment platinum resistance transmission circuit is applicable to output voltage type temperature transmitter.
Principle of work: excitation voltage source is the bridge for measuring temperature power supply, make programmable gain amplifier PGA realize the non-linear correction of platinum resistance RT thermometric by common mode build-out resistor Rc, the signal of the temperature variant resistance value nonlinearities change of platinum resistance RT amplifies through programmable gain amplifier PGA, a part of nonlinear properties of programmable gain amplifier PGA output feed back to the input anode of programmable gain amplifier PGA through the nonlinear compensation resistance R _ f, realize the non-linear correction of platinum resistance RT again with platinum resistance RT signal stack back.
More than be ultimate principle of the present invention and feature; the specific embodiment of the invention can not only limit to this; technician for the industry; do not breaking away under the prerequisite of thinking of the present invention; also can make other similar changes, and this all should be considered as the desired protection domain of claims of the present invention.

Claims (5)

1. the non-linear correction temperature of platinum resistance transmission circuit, it is characterized in that: comprise bridge for measuring temperature and programmable gain amplifier PGA, the power supply negative terminal of bridge for measuring temperature is connected with signal ground by common mode build-out resistor Rc, the output terminal of bridge for measuring temperature is connected with the input end of programmable gain amplifier PGA, be connected to the nonlinear compensation resistance R _ f between the input anode of programmable gain amplifier PGA and its output terminal, form positive feedback; Bridge for measuring temperature is by the wheatstone bridge of platinum resistance RT as bridge circuit one arm.
2. the non-linear correction temperature of platinum resistance according to claim 1 transmission circuit, it is characterized in that: described temperature transmission circuit also comprises the V/I change-over circuit, the power supply of bridge for measuring temperature is just terminating at the reference voltage terminal of V/I change-over circuit, and the output terminal of programmable gain amplifier PGA is connected with the input end of V/I change-over circuit.
3. the non-linear correction temperature of platinum resistance according to claim 1 transmission circuit, it is characterized in that: described temperature transmission circuit also comprises excitation voltage source Vr, excitation voltage source Vr is connected on the power supply anode of bridge for measuring temperature.
4. the non-linear correction temperature of platinum resistance according to claim 1 transmission circuit is characterized in that: described platinum resistance RT employing two-wire system or three-wire system platinum resistance.
5. the non-linear correction temperature of platinum resistance according to claim 1 transmission circuit, it is characterized in that: described programmable gain amplifier PGA adopts the programmable gain amplifier of adjustable zero-bit, full scale.
CN201310145658.7A 2013-04-24 2013-04-24 Non-linear platinum resistor correction temperature transmission circuit Active CN103278257B (en)

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN104482947A (en) * 2014-12-26 2015-04-01 镇江中煤电子有限公司 Mining multi-mode sensor signal transmission circuit
CN104868856A (en) * 2015-05-28 2015-08-26 北京凌阳益辉科技有限公司 Non-linear feedback circuit and integrated amplifying circuit
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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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104482947A (en) * 2014-12-26 2015-04-01 镇江中煤电子有限公司 Mining multi-mode sensor signal transmission circuit
CN104868856A (en) * 2015-05-28 2015-08-26 北京凌阳益辉科技有限公司 Non-linear feedback circuit and integrated amplifying 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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