CN109520635A - A kind of platinum resistance nonlinear compensation and signal processing circuit - Google Patents
A kind of platinum resistance nonlinear compensation and signal processing circuit Download PDFInfo
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- CN109520635A CN109520635A CN201811327873.8A CN201811327873A CN109520635A CN 109520635 A CN109520635 A CN 109520635A CN 201811327873 A CN201811327873 A CN 201811327873A CN 109520635 A CN109520635 A CN 109520635A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
- G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
- G01K7/21—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit for modifying the output characteristic, e.g. linearising
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Abstract
The present invention relates to a kind of platinum resistance nonlinear compensation and signal processing circuits, are suitable for current platinum resistance (PT100, PT200, PT1000 etc.) all types of on the market and belong to signal conditioning circuit design field.Circuit includes the constant-current source of three terminal regulator U1 and resistance R6 composition, zener diode V1, operational amplifier U2, current-limiting resistance R1, adjusts resistance R2~R4, compensation resistance R5；The present invention is a kind of platinum resistance nonlinear compensation and signal processing circuit, while being converted to voltage signal to the resistance signal of platinum resistance output.Using positive feedback method to platinum resistance export it is non-linear compensate, by the method for the supply current being continuously increased in platinum resistance, make the voltage in platinum resistance and the temperature line relationship of impression, complete the nonlinear compensation of platinum resistance.While circuit is also amplified to signal in platinum resistance and zero compensation, so that compensation circuit output voltage is adjustable voltage signal within the scope of 0V~15V.
Description
Technical field
The present invention relates to a kind of platinum resistance nonlinear compensation and signal processing circuits, are suitable at present all types on the market
Platinum resistance (PT100, PT200, PT1000 etc.) belong to signal conditioning circuit design field.
Background technique
Platinum resistance has many advantages, such as that measurement range is wide, temperature measurement accuracy is high, good reliability as temperature-sensing element, becomes me
The temperature-sensing element of factory's temperature sensor mainstream.It is more directly to export the temperature sensor of the resistance signal of platinum resistance at present.With
Host diversification that temperature sensor output signal is required, the temperature sensor demand with pick-up output it is more and more.
But platinum resistance output resistance signal itself is nonlinear properties, when being exported using resistance, is carried out by the host computer of acquisition signal
Nonlinear compensation, sensor output nonlinear itself can be ignored.When temperature sensor using pick-up export when, it is non-linear will
As a critically important factor for influencing output accuracy.Such as in -60 DEG C~200 DEG C temperature ranges, non-linear maximum deviation
About 2.5 DEG C, and product requirement measurement accuracy, usually within the scope of ± 1 DEG C~± 1.5 DEG C, therefore, platinum resistance is non-linear will
Output of products precision is caused to seriously affect.Therefore, improve the non-linear of platinum resistance, improving output of products precision becomes very heavy
It wants.
Improve the non-linear of platinum resistance, the non-linear of platinum resistance need to be compensated in signal conversion circuit, be led herein
A kind of non-linear compensation circuit scheme is introduced, and passes through analysis of experiments, the compensation effect of verifying platinum resistance non-linear compensation circuit
Fruit.
Summary of the invention
The purpose of the present invention: for the nonlinear problem for solving platinum resistance resistance value Yu experiencing temperature, improve platinum resistance
The linearity, improve the output accuracy of platinum resistance transmission circuit, the present invention provides a kind of new platinum resistance nonlinear compensation electricity
Road.
Technical solution of the present invention: a kind of platinum resistance nonlinear compensation and signal processing circuit, which is characterized in that circuit packet
It includes the constant-current source of three terminal regulator U1 and resistance R6 composition, zener diode V1, operational amplifier U2, current-limiting resistance R1, adjust
Resistance R2~R4, compensation resistance R5；Just for DC power supply, GND is for DC power supply by IN；Three terminal regulator U1 input terminal and power supply
Just it is connected, output end is connected with adjustment end adjusts resistance R6, forms constant-current source as platinum resistance RTD power supply；The one end current-limiting resistance R1
It is connect with power supply, the other end is connect with zener diode V1 negative terminal, and the electric current on zener diode V1 is flowed through in limitation, is guaranteed
Zener diode V1 is worked normally；Zener diode V1 anode is connected with power ground, and constant reference electricity is provided for late-class circuit
Pressure；Resistance R2, R3 series connection are adjusted, the both ends of zener diode V1 are then connected to, bleeder circuit is formed, as operational amplifier
Reverse input end voltage；The one end platinum resistance RTD and the adjustable side of three terminal regulator connect, and other end is connected with power ground, platinum
Resistance generates voltage by current excitation, as the anti-noninverting input voltage of operational amplifier；Operational amplifier uses direct current
Source power supply, noninverting input connect the common end of the adjustment end of platinum resistance and three terminal regulator, and reverse input end connection adjusts electricity
The common end of R2, R3 are hindered, while connecting one end of resistance R4, the connection of operational amplifier U2 output end adjusts the another of resistance R4
End, the amplification of composition signal and zero adjustment circuit, amplify the voltage signal in platinum resistance and zero point adjusts；Compensate resistance
The one end R5 connects operational amplifier U2 noninverting input, and the other end connects the output end of operational amplifier U2, forms positive and negative feed
Road, provides compensation electric current for platinum resistance, is simultaneously platinum resistance power supply with constant-current source, voltage signal is generated in platinum resistance.
Power supply voltage used in the platinum resistance nonlinear compensation and signal processing circuit is 15V~28V.
The electric current of the constant-current source output is determining by following formula,
In formula:
IIt is mainFor constant current source current；
VrefFor three terminal regulator reference voltage.
It is described compensation resistance R5 resistance value be as following formula calculate obtained by,
In formula:
VOMCircuit needs the voltage exported when for medium temperature point；
VOLCircuit needs the voltage exported when for minimum temperature point；
VOHCircuit needs the voltage exported when for maximum temperature point；
RRMVoltage in platinum resistance when for medium temperature point；
RRLVoltage in platinum resistance when for minimum temperature point；
RRHVoltage in platinum resistance when for maximum temperature point；
IIt is mainFor constant current source current.
Under value of the voltage signal generated in the platinum resistance in platinum resistance maximum temperature point and minimum temperature point passes through
Formula determines:
In formula:
VOLCircuit needs the voltage exported when for minimum temperature point；
VOHCircuit needs the voltage exported when for maximum temperature point；
VRLVoltage when for minimum temperature point in platinum resistance；
VRHVoltage when for maximum temperature point in platinum resistance；
RRLVoltage in platinum resistance when for minimum temperature point；
RRHVoltage in platinum resistance when for maximum temperature point；
IIt is mainFor constant current source current.
The resistance value for adjusting resistance R3 is usually 1k Ω.
Described adjusting resistance R2, the R4 is calculated by following formula
In formula:
VOLCircuit needs the voltage exported when for minimum temperature point；
VOHCircuit needs the voltage exported when for maximum temperature point；
VRLVoltage when for minimum temperature point in platinum resistance；
VRHVoltage when for maximum temperature point in platinum resistance.
The current-limiting resistance R1 value range is 10k Ω~100k Ω.
Beneficial effects of the present invention: the present invention can be effectively improved the non-linear of platinum resistance output, and platinum resistance is exported electricity
The non-linear of resistance is reduced to original 1/150, improves the temperature measurement accuracy of platinum resistance.Platinum resistance output resistance signal is converted simultaneously
For the adjustable voltage signal of 0V~15V.
Detailed description of the invention
Fig. 1 is platinum resistance nonlinear compensation schematic diagram.
Fig. 2 is platinum resistance non-linear compensation circuit figure.
Specific embodiment
Technical solution of the present invention is further described below with reference to drawings and examples:
Constant-current source circuit is formed by three terminal regulator and resistance in the present invention and provides mains supply current for platinum resistance, by positive and negative
Feed resistance R5 provide the compensation electric current gradually changed with output, and platinum resistance exports under the excitation of two electric currents to be become with temperature linearity
The voltage signal of change；Then signal amplification is carried out to the signal that platinum resistance exports by operational amplifier and zero point adjusts, so that
The adjustable voltage signal of final output 0V~15V.
As shown in Fig. 2, platinum resistance non-linear compensation circuit be made of three terminal regulator U1 and resistance R6 constant-current source, pressure stabilizing
Diode V1, operational amplifier U2, current-limiting resistance R1, resistance R2~R4, compensation resistance R5 composition are adjusted.IN is DC power supply
(15V~28V) just, GND is for DC power supply.
Three terminal regulator U1 input terminal is connect with power input, and adjustment end connect resistance R1 composition constant current with output end
Source provides master drive electric current for platinum resistance, and platinum resistance one end connects three terminal regulator input terminal, and other end connects power ground.
Constant current source output current are as follows:
In formula: IIt is mainFor constant current source current；
VrefFor three terminal regulator reference voltage.
Compensation one end resistance R5 is connect with platinum resistance one end (ungrounded end) and the noninverting input of operational amplifier, another
End is connect with operational amplifier output terminal, is formed positive-feedback circuit, is provided compensation electric current for platinum resistance, i.e., electricity of powering in platinum resistance
Stream is the sum of the compensation electric current that the exciting current that three terminal regulator provides and resistance R5 are provided.Since compensation resistance R5 is for providing
Therefore, voltage is as shown in Equation 2 in platinum resistance.
In formula: VOFor circuit output voltage；
RRTDFor resistance value of the platinum resistance under each temperature spot；
VRTDFor circuit output voltage.
For the compensation effect for guaranteeing platinum resistance, it need to guarantee that platinum resistance is equal in the boundary temperature point and medium temperature point that need to be calibrated
Meet zero error, that is, meets formula 3.
2*VRM=(VRL+VRH) (3)
In formula: VRMVoltage in platinum resistance when for medium temperature point；
VRLVoltage in platinum resistance when for minimum temperature point；
VRHVoltage in platinum resistance when for maximum temperature point.
It is that can determine the resistance value of compensation resistance R5 by formula 2 and formula 3, as shown in Equation 4:
In formula:
VOMCircuit needs the voltage exported when for medium temperature point；
VOLCircuit needs the voltage exported when for minimum temperature point；
VOHCircuit needs the voltage exported when for maximum temperature point；
RRMVoltage in platinum resistance when for medium temperature point；
RRLVoltage in platinum resistance when for minimum temperature point；
RRHVoltage in platinum resistance when for maximum temperature point；
For compensation resistance R5 for providing the compensation circuit of very little, resistance value usually at Ω grades of M, is far longer than the resistance of platinum resistance
Value, it is possible to formula 4 suitably be simplified, that is, think R5+RRMWith R5+RRLWith R5+RRHIt is approximately equal, it can must compensate resistance R5
Calculation formula are as follows:
It is that can determine that positive feedback compensates the resistance value of resistance R5 by formula 5.
The one end resistance R1 is connected with power supply, and other end is connected with zener diode V1 negative terminal, flows through for limiting
Electric current on zener diode V1, another termination power ground of zener diode provide a reference voltage V for subsequent conditioning circuitREF。
Resistance R2, R3 series connection, two not common ends of latter two resistance of connecting connects with the both ends of zener diode respectively, common end and
Operational amplifier reverse input end is connected with one end of resistance R4, and the other end of resistance R4 and the output of operational amplifier connect
It connects.It forms signal amplification and zero adjustment circuit, circuit output voltage is as shown in Equation 6.
In formula:
VOFor circuit output voltage；
IIt is mainFor constant current source current；
RRTDFor resistance value of the platinum resistance under each temperature spot；
VREFFor three terminal regulator reference voltage.
It, respectively will be intermediate according to formula 5 it is found that by changing the i.e. changeable compensation circuit output voltage range of resistance R2~R4
In platinum resistance when temperature spot and boundary temperature point voltage and circuit output voltage bring into formula 5 can determine adjust resistance R2~
The value of R4.Wherein the usual value of resistance R3 is 1k Ω, so resistance R2, R4 calculation formula is as follows:
In formula:
VOLCircuit needs the voltage exported when for minimum temperature point；
VOHCircuit needs the voltage exported when for maximum temperature point；
VRLVoltage when for minimum temperature point in platinum resistance；
VRHVoltage when for maximum temperature point in platinum resistance；
According to the above analysis and the design of platinum resistance non-linear compensation circuit can be completed in resistance calculations.
Claims (8)
1. a kind of platinum resistance nonlinear compensation and signal processing circuit, which is characterized in that circuit includes three terminal regulator U1 and electricity
It hinders the constant-current source of R6 composition, zener diode V1, operational amplifier U2, current-limiting resistance R1, adjust resistance R2~R4, compensation resistance
R5；Just for DC power supply, GND is for DC power supply by IN；Three terminal regulator U1 input terminal is just being connected with power supply, output end and adjustment
End connection adjusts resistance R6, forms constant-current source as platinum resistance RTD power supply；The one end current-limiting resistance R1 is connect with power supply, another
End is connect with zener diode V1 negative terminal, and the electric current on zener diode V1 is flowed through in limitation, guarantees the normal work of zener diode V1
Make；Zener diode V1 anode is connected with power ground, and constant reference voltage is provided for late-class circuit；Adjust resistance R2, R3 string
Then connection is connected to the both ends of zener diode V1, bleeder circuit is formed, as operational amplifier reverse input end voltage；Platinum
The one end resistance RTD and the adjustable side of three terminal regulator connect, and other end is connected with power ground, and platinum resistance is produced by current excitation
Raw voltage, as the anti-noninverting input voltage of operational amplifier；Operational amplifier is powered using DC power supply, and noninverting input connects
The common end of the adjustment end of platinum resistance and three terminal regulator is connect, reverse input end connection adjusts the common end of resistance R2, R3, simultaneously
One end of resistance R4 is connected, the connection of operational amplifier U2 output end adjusts the other end of resistance R4, the amplification of composition signal and zero point
Adjustment circuit, amplifies the voltage signal in platinum resistance and zero point adjusts；It compensates the one end resistance R5 and connects operational amplifier
U2 noninverting input, the other end connect the output end of operational amplifier U2, form positive-feedback circuit, and compensation platinum resistance exports non-
Linearly.
2. a kind of platinum resistance nonlinear compensation as described in claim 1 and signal processing circuit, which is characterized in that the platinum electricity
Hindering power supply voltage used in nonlinear compensation and signal processing circuit is 15V~28V.
3. a kind of platinum resistance nonlinear compensation as claimed in claim 1 or 2 and signal processing circuit, which is characterized in that described
Constant current source current is determining by following formula,
In formula
IIt is mainFor constant current source current；
VrefFor three terminal regulator reference voltage.
4. a kind of platinum resistance nonlinear compensation as claimed in claim 3 and signal processing circuit, which is characterized in that the compensation
The resistance value of resistance R5 is determined by following formula,
In formula:
VOMCircuit needs the voltage exported when for medium temperature point；
VOLCircuit needs the voltage exported when for minimum temperature point；
VOHCircuit needs the voltage exported when for maximum temperature point；
RRMVoltage in platinum resistance when for medium temperature point；
RRLVoltage in platinum resistance when for minimum temperature point；
RRHVoltage in platinum resistance when for maximum temperature point；
IIt is mainFor constant current source current.
5. a kind of platinum resistance nonlinear compensation as claimed in claim 4 and signal processing circuit, which is characterized in that the platinum electricity
Value of the voltage signal generated in resistance in platinum resistance maximum temperature point and minimum temperature point is determined by following formula:
In formula:
VOLCircuit needs the voltage exported when for minimum temperature point；
VOHCircuit needs the voltage exported when for maximum temperature point；
VRLVoltage when for minimum temperature point in platinum resistance；
VRHVoltage when for maximum temperature point in platinum resistance；
RRLVoltage in platinum resistance when for minimum temperature point；
RRHVoltage in platinum resistance when for maximum temperature point；
IIt is mainFor constant current source current.
6. a kind of platinum resistance nonlinear compensation as claimed in claim 5 and signal processing circuit, which is characterized in that the adjusting
The resistance value of resistance R3 is usually 1k Ω.
7. a kind of platinum resistance nonlinear compensation as claimed in claim 6 and signal processing circuit, which is characterized in that the tune
Economize on electricity resistance R2~R4 is calculated by following formula
In formula:
VOLCircuit needs the voltage exported when for minimum temperature point；
VOHCircuit needs the voltage exported when for maximum temperature point；
VRLVoltage when for minimum temperature point in platinum resistance；
VRHVoltage when for maximum temperature point in platinum resistance.
8. a kind of platinum resistance nonlinear compensation as claimed in claim 7 and signal processing circuit, which is characterized in that the current limliting
Resistance R1 value range is 10k Ω~100k Ω.
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| CN201811327873.8A CN109520635B (en) | 2018-11-09 | 2018-11-09 | Platinum resistor nonlinear compensation and signal processing circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112763090A (en) * | 2020-12-24 | 2021-05-07 | 西安翔腾微电子科技有限公司 | Pt temperature sensor nonlinear compensation method and circuit |
| CN113790816A (en) * | 2021-07-06 | 2021-12-14 | 南京华士电子科技有限公司 | Temperature measurement linear processing circuit based on NTC |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2148955Y (en) * | 1992-12-12 | 1993-12-08 | 林树森 | Strain pressure transducer |
| US7956589B1 (en) * | 2008-02-25 | 2011-06-07 | Fairchild Semiconductor Corporation | Compensation network for error amplifier of a low dropout regulator |
| CN203432592U (en) * | 2013-05-30 | 2014-02-12 | 深圳市振华微电子有限公司 | V/I converter with temperature compensation |
| CN203572583U (en) * | 2013-09-18 | 2014-04-30 | 深圳市绿恩环保技术有限公司 | Temperature transforming circuit and temperature transformer |
| CN108151919A (en) * | 2017-11-17 | 2018-06-12 | 中国电子科技集团公司第四十八研究所 | A kind of pressure sensor temperature drift compensation circuit and compensation method |
| CN108195480A (en) * | 2018-02-24 | 2018-06-22 | 重庆澳净环保科技有限公司 | A kind of high-precision temperature detection circuit |
-
2018
- 2018-11-09 CN CN201811327873.8A patent/CN109520635B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2148955Y (en) * | 1992-12-12 | 1993-12-08 | 林树森 | Strain pressure transducer |
| US7956589B1 (en) * | 2008-02-25 | 2011-06-07 | Fairchild Semiconductor Corporation | Compensation network for error amplifier of a low dropout regulator |
| CN203432592U (en) * | 2013-05-30 | 2014-02-12 | 深圳市振华微电子有限公司 | V/I converter with temperature compensation |
| CN203572583U (en) * | 2013-09-18 | 2014-04-30 | 深圳市绿恩环保技术有限公司 | Temperature transforming circuit and temperature transformer |
| CN108151919A (en) * | 2017-11-17 | 2018-06-12 | 中国电子科技集团公司第四十八研究所 | A kind of pressure sensor temperature drift compensation circuit and compensation method |
| CN108195480A (en) * | 2018-02-24 | 2018-06-22 | 重庆澳净环保科技有限公司 | A kind of high-precision temperature detection circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| WO2021139128A1 (en) * | 2020-01-06 | 2021-07-15 | 宁波中车时代传感技术有限公司 | Measurement circuit of thin-film temperature sensor |
| CN112763090A (en) * | 2020-12-24 | 2021-05-07 | 西安翔腾微电子科技有限公司 | Pt temperature sensor nonlinear compensation method and circuit |
| CN112763090B (en) * | 2020-12-24 | 2022-10-18 | 西安翔腾微电子科技有限公司 | Pt temperature sensor nonlinear compensation method and circuit |
| CN113790816A (en) * | 2021-07-06 | 2021-12-14 | 南京华士电子科技有限公司 | Temperature measurement linear processing circuit based on NTC |
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