CN110333002A - Platinum resistance temperature sensor isolating amplifier circuit and adjustment method - Google Patents
Platinum resistance temperature sensor isolating amplifier circuit and adjustment method Download PDFInfo
- Publication number
- CN110333002A CN110333002A CN201910550863.9A CN201910550863A CN110333002A CN 110333002 A CN110333002 A CN 110333002A CN 201910550863 A CN201910550863 A CN 201910550863A CN 110333002 A CN110333002 A CN 110333002A
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- China
- Prior art keywords
- amplifier
- platinum resistance
- gnd
- temperature sensor
- circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- 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
Abstract
The present invention relates to platinum resistance temperature sensor isolating amplifier circuit and adjustment methods comprising including platinum resistor temperature measuring electric bridge, excitation voltage source VR, may be programmed preposition amplification (gamma correction) circuit, isolating amplifier circuit and signal output amplifier.Circuit theory: a kind of circuit diagram of platinum resistance temperature sensor isolating amplifier circuit is as shown in the picture.This is an input signal and output signal respectively by single supply (positive supply) isolating amplifier circuit of two independent+5V power supply excitations.The platinum resistance temperature sensor Rt for being placed in thermometric scene is connected through connecting wire with bridge for measuring temperature, and the present invention has rational design, compact-sized and easy to use.
Description
Technical field
The invention belongs to sensor technical fields, and in particular to platinum resistance temperature sensor isolating amplifier circuit debugging side
Method.
Background technique
Temperature sensor is industrial process, meteorology, environmental protection, the widely used survey of defence engineering or even each field of daily life
Warm instrument, most temperature sensor, especially platinum resistor temperature measuring sensor are all to export letter after composition electric bridge amplifies
Number, it is all to be attached with connecting wire between platinum sensor and amplifying circuit.When platinum sensor local environment
It, will be to amplifying circuit or even subsequent control and measurement when having compared with strong electromagnetic signal or thering is higher voltage to seal in connecting line
Instrument damages.Therefore usual way is all defeated to carrying out between sensor and amplifying circuit or subsequent connection circuit in the industry
The isolation for entering output signal makes to play the role of playing protection to subsequent conditioning circuit or instrument when high voltage seals in input signal.
It is general for the processing of input/output signal isolation that there are two types of modes.One is isolating transformers to carry out input and output
The mode of signal isolation, this mode need for input signal to be modulated into the AC signal of certain frequency, and signal is through being isolated
Re-demodulation is at required signal mode after transformer isolation, and bring distinct disadvantage is exactly that volume is big, believes in this way for institute
Number conversion accuracy is lower (1%~5%).Another way is exactly Phototube Coupling, Phototube Coupling also have using photoelectrical coupler every
For discrete set at two kinds of forms of isolated amplifier, isolation of the photoelectrical coupler for input/output signal is very extensive, but for surveying
For the higher sensor of accuracy of measurement, one is that volume is larger, the other is signal conversion accuracy is lower, institute is in this way very
It is used less；Signal isolation zoom comparison of the integrated isolated amplifier for sensor is universal, but the circuit structure used all compares
More complex and conversion accuracy is lower (1%), so that the sensor bulk being made into is larger, measurement accuracy is low (1%), is unable to satisfy small
The measurement of the temperature of volume and degree of precision.
The amplification circuit structure of the platinum resistance temperature sensor of existing input/output signal isolation is complex, volume all compared with
Greatly, low measurement accuracy, when the measurement accuracy that the installation site space in required measurement temperature place is limited and requires is higher, just
It is unable to satisfy the demand of user.
Summary of the invention
The technical problem to be solved by the present invention is to be directed to the deficiency of existing platinum resistance temperature sensor isolating amplifier circuit,
It provides a kind of compared with high measurement accuracy, smaller size smaller, the adjustment method of the simple isolating amplifier circuit of circuit structure and circuit, reaches
Not only it had been able to achieve the temperature measurement of degree of precision, but also can accomplish the smaller size smaller of circuit, has made to provide a kind of side for certain Code in Hazardous Special Locations
Just the sensor installed is possibly realized.
To solve the above problems, the technical solution used in the present invention is:
A kind of platinum resistance temperature sensor isolating amplifier circuit, including platinum resistor temperature measuring electric bridge, excitation voltage source V R, can
Program preposition amplification (gamma correction) circuit, isolating amplifier circuit and signal output amplifier.
Circuit theory: a kind of circuit diagram of platinum resistance temperature sensor isolating amplifier circuit is as shown in the picture.This is
Amplification is isolated by the single supply (positive supply) of two independent+5V power supply excitations respectively in one input signal and output signal
Circuit.The platinum resistance temperature sensor Rt for being placed in thermometric scene is connected through connecting wire with bridge for measuring temperature, when thermometric scene
When temperature changes, bridge for measuring temperature disequilibrium exports mV magnitude voltage signals relevant to temperature change, which send
Enter the input terminal V of programmable amplifierin1And Vin2It amplifies, since the input signal amplitude maximum of isolated amplifier cannot surpass
2V is crossed, therefore the output signal of programmable amplifier wants≤2V, which can not be too small, if signal is small, rear class
It is Phototube Coupling inside isolated amplifier, signal is small to make the isolated amplifier output nonlinear error increase；It is programmable to put
After the input terminal that the output signal of big device is sent into isolated amplifier carries out Phototube Coupling, output common mode voltage with input signal gradually
Reduced difference voltage signal, that is the common-mode voltage in output signal is an amount for variation, which is sent into
The input terminal V of instrument amplifierin+And Vin-5 times of signal amplification is carried out, final entire circuit output and temperature inversion are linear
The voltage signal of relationship.Instrument amplifier is the amplifier of single supply, for its input request signal palpus of the amplifier of single supply
There is the common-mode voltage not less than 1V, and its common-mode voltage is when isolated amplifier (ACPL-C87A) output signal minimum
1.25V, common-mode voltage is close to ground level when spiking output, so the device that can be selected rear class amplifying circuit is very limited
, it is desirable that it is that comparison is harsh.The zero-bit and full scale tuning parameter of pga circuit must pre-set a fixed range
Otherwise parameter will be unable to debug out output signal.
It is of the present invention the specific scheme is that
A kind of platinum resistance temperature sensor isolating amplifier circuit, including platinum resistance temperature sensor electric bridge, excitation voltage source
VR, gamma correction programmable pre-amplification circuit, isolating amplifier circuit and signal output amplifier；Platinum resistance temperature passes
Sensor electric bridge includes resistance R0, R1, R2, RT；
It is characterized in that, excitation voltage source VR1 termination power Vs1Pass through capacitor C afterwards1With GND1It is connected, excitation voltage source
VR2 termination GND1, the V of excitation voltage sourceRWith the R of bridge for measuring temperature1And R2It is connected, R1And R2Respectively with R0With platinum resistance RTIt is connected,
Platinum resistance RTAnd R0Be connected rear and RCIt is connected, RCMeet GND1；
The output end of bridge for measuring temperature includes R2With RTTie point and R1With R0Tie point；Two tie point difference
With the V of programmable amplifier U2in1And Vin2It is connected, the V of programmable amplifier U2CCWith Vs1It is connected, the GND of programmable amplifier
With GND1It is connected, the output end V of programmable amplifier U2OUTPass through resistance RFWith R2And RTTie point be connected, realize platinum resistance
The linear compensation of thermometric；The output end V of programmable amplifier U2OUTIt is connected with the input terminal Vin of isolated amplifier U3, is isolated
The VDD of journey amplifier U31And VDD2Respectively with Vs1And Vs2It is connected, the gnd of journey amplifier is isolated1And gnd2Respectively with GND1With
GND2It is connected；The output end V of isolated amplifier U3O+ and VOThe IN+ for meeting instrument amplifier U4 respectively is connected with IN-, instrument amplification
The V+ and V of device U4s2It is connected, the V- and GND of instrument amplifier U42It is connected.
By the zero-bit and full scale of debugging programmable amplifier, so that it may obtain in supply voltage being two groups of 5V independent current sources
When the mutually isolated output voltage signal of input and output, since three-stage amplifier is that single supply is powered, input signal
A common-mode voltage is required, the tuning parameter value that zero-bit and full scale must be preset before programmable amplifier debugging just may be used
Output signal needed for debugging out.
Beneficial effects of the present invention have carried out more detailed description in specific embodiment part.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Specific embodiment
As shown in Figure 1, the present embodiment includes platinum resistance temperature sensor bridge for measuring temperature, excitation voltage source U1(FEF3140)、
Programmable preamplifier (gamma correction) U2(chip PGA308), isolated amplifier U3(ACPL-C87A) and signal exports
Amplifier U4(AD8227), as shown in the picture, as long as changing RTNumerical value, suitable R is setCAnd RF(RCAnd RFNumerical value value
Principle is detailed in ZL201310145658.7) numerical value, by be arranged programmable amplifier zero-bit and full scale in a certain range
Numerical value, by monitor programmable amplifier output signal be not more than 1V, so that it may debug out required for output signal.
Example: isolated form platinum resistance temp transmitter
A kind of platinum resistance temperature sensor isolating amplifier circuit, is applied particularly to the platinum resistance temp transmitter of isolated form.
Platinum resistance temperature sensor uses Pt1000, and the measurement range of temperature is 50 DEG C~150 DEG C, power supply VS1And VS2Be+
5V, bridge excitation power supply are that 4.096V requirement output signal is 0.1V~3.3V, select R1And R2It is 14K Ω, R0For 1.2K Ω,
RCFor 24K Ω, presetting tuning parameter zero-bit is 0.0683V, and presetting fullness parameters is 0.6243V, obtains following test result:
It can be seen that the output signal of isolated form platinum resistance temp transmitter after isolation amplification from above-mentioned test data
The more previous isolating amplifier circuit of its measurement error is substantially reduced, and error is less than 0.1%FS.
The present invention has rational design, it is low in cost, durable, safe and reliable, easy to operate, time saving and energy saving, save fund,
It is compact-sized and easy to use, with the signal isolation type temperature transmitter for the circuit production that the present invention provides, 10 can be encapsulated in
In the metal shell of foot dual-in-line, it is low, bulky to overcome previous platinum resistance temperature isolating amplifier circuit temperature measurement accuracy
Disadvantage can be limited place for certain installation space positions and provide the possibility of high precision measuring temperature.
It is to disclose in order to more clear, and the prior art is just no longer enumerated that the present invention, which fully describes,.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify to technical solution documented by previous embodiment or equivalent replacement of some of the technical features；Make
It is obvious for being combined for those skilled in the art to multiple technical solutions of the invention.And these are modified or replace
It changes, the spirit and scope for technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (3)
1. a kind of platinum resistance temperature sensor isolating amplifier circuit, it is characterised in that: including platinum resistance temperature sensor electric bridge, swash
Encourage voltage source VR, gamma correction programmable pre-amplification circuit, isolating amplifier circuit and signal output amplifier；Platinum
Resistance temperature sensor electric bridge includes resistance R0, R1, R2, RT;
It is characterized in that, excitation voltage source VR1 termination power Vs1Pass through capacitor C afterwards1With GND1It is connected, excitation voltage source VR
2 termination GND1, the V of excitation voltage sourceRWith the R of bridge for measuring temperature1And R2It is connected, R1And R2Respectively with R0With platinum resistance RTIt is connected, platinum
Resistance RTAnd R0Be connected rear and RCIt is connected, RCMeet GND1；
The output end of bridge for measuring temperature includes R2With RTTie point and R1With R0Tie point；Two tie points respectively with can
Program the V of amplifier U2in1And Vin2It is connected, the V of programmable amplifier U2CCWith Vs1It is connected, the GND and GND of programmable amplifier1
It is connected, the output end V of programmable amplifier U2OUTPass through resistance RFWith R2And RTTie point be connected, realize platinum resistor temperature measuring
Linear compensation；The output end V of programmable amplifier U2OUTIt is connected with the input terminal Vin of isolated amplifier U3, Cheng Fang great is isolated
The VDD of device U31And VDD2Respectively with Vs1And Vs2It is connected, the gnd of journey amplifier is isolated1And gnd2Respectively with GND1And GND2It is connected；
The output end V of isolated amplifier U3O+ and VOThe IN+ for meeting instrument amplifier U4 respectively is connected with IN-, the V+ of instrument amplifier U4
With Vs2It is connected, the V- and GND of instrument amplifier U42It is connected.
2. platinum resistance temperature sensor isolating amplifier circuit according to claim 1, it is characterised in that: it, which is applied, is being isolated
On type platinum resistance temp transmitter.
3. the adjustment method of platinum resistance temperature sensor isolating amplifier circuit, it is characterised in that: change the numerical value of RT, adjustment
The numerical value of RC and RF is arranged the zero-bit of programmable amplifier and the numerical value of full scale, monitors the output signal of programmable amplifier not
Greater than given threshold, that is, output signal required for debugging out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910550863.9A CN110333002A (en) | 2019-06-24 | 2019-06-24 | Platinum resistance temperature sensor isolating amplifier circuit and adjustment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910550863.9A CN110333002A (en) | 2019-06-24 | 2019-06-24 | Platinum resistance temperature sensor isolating amplifier circuit and adjustment method |
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| Publication Number | Publication Date |
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| CN110333002A true CN110333002A (en) | 2019-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910550863.9A Pending CN110333002A (en) | 2019-06-24 | 2019-06-24 | Platinum resistance temperature sensor isolating amplifier circuit and adjustment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114785288A (en) * | 2022-06-20 | 2022-07-22 | 中国空气动力研究与发展中心低速空气动力研究所 | Amplifier power supply circuit of balance bridge and bridge amplifying circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100020842A1 (en) * | 2008-07-28 | 2010-01-28 | Finesse Solutions, Llc. | System and method for temperature measurement |
| CN101957243A (en) * | 2009-07-14 | 2011-01-26 | 中国科学院空间科学与应用研究中心 | High-precision temperature measuring device and method |
| CN103278257A (en) * | 2013-04-24 | 2013-09-04 | 青岛航天半导体研究所有限公司 | Non-linear platinum resistor correction temperature transmission circuit |
| CN105571739A (en) * | 2016-01-28 | 2016-05-11 | 山东鲁能智能技术有限公司 | Detecting system and detecting method for charging gun head temperature of electric vehicle |
| CN206038182U (en) * | 2016-08-10 | 2017-03-22 | 杭州易和网络有限公司 | Be applied to circuit that IGBT temperature detected |
-
2019
- 2019-06-24 CN CN201910550863.9A patent/CN110333002A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100020842A1 (en) * | 2008-07-28 | 2010-01-28 | Finesse Solutions, Llc. | System and method for temperature measurement |
| CN101957243A (en) * | 2009-07-14 | 2011-01-26 | 中国科学院空间科学与应用研究中心 | High-precision temperature measuring device and method |
| CN103278257A (en) * | 2013-04-24 | 2013-09-04 | 青岛航天半导体研究所有限公司 | Non-linear platinum resistor correction temperature transmission circuit |
| CN105571739A (en) * | 2016-01-28 | 2016-05-11 | 山东鲁能智能技术有限公司 | Detecting system and detecting method for charging gun head temperature of electric vehicle |
| CN206038182U (en) * | 2016-08-10 | 2017-03-22 | 杭州易和网络有限公司 | Be applied to circuit that IGBT temperature detected |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114785288A (en) * | 2022-06-20 | 2022-07-22 | 中国空气动力研究与发展中心低速空气动力研究所 | Amplifier power supply circuit of balance bridge and bridge amplifying circuit |
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Application publication date: 20191015 |
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