CN106525266A - Temperature measurement conversion circuit - Google Patents
Temperature measurement conversion circuit Download PDFInfo
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- CN106525266A CN106525266A CN201611169647.2A CN201611169647A CN106525266A CN 106525266 A CN106525266 A CN 106525266A CN 201611169647 A CN201611169647 A CN 201611169647A CN 106525266 A CN106525266 A CN 106525266A
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- Prior art keywords
- resistance
- circuit
- voltage
- electric capacity
- operational amplifier
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The present invention discloses a temperature measurement conversion circuit. The circuit comprises a voltage reference circuit, a voltage follower circuit, a temperature sensor U7 and a voltage amplifier circuit. The temperature measurement conversion circuit also comprises the resistance bridge circuit of the temperature sensor U7, the voltage reference circuit is connected with the input end of the voltage follower circuit, the resistance bridge circuit of the temperature sensor U7 is connected with the input end of the voltage amplifier circuit, and the output ends of the voltage follower circuit and the voltage amplifier circuit are connected with the ADC collection end of a single-chip microcomputer U3. Compared to the prior art, the single-chip microcomputer U3 collects the output of the two operational amplifiers U4A and U4B at the same time to obtain an accurate temperature value so as to effectively reduce the ADC collection errors caused by the power voltage fluctuation of the operational amplifiers and the external factor interference and improve the collection precision and the stability of the ADC.
Description
Technical field
The present invention relates to technical field of temperature measurement, specifically a kind of temperature survey change-over circuit.
Background technology
Bus-type temperature survey is mainly used in measuring pipeline temperature of liquid, due to various dry in existing temperature sensor
Disturb, cause temperature survey change-over circuit certainty of measurement to be greatly reduced, Linear Quasi is right low, measured temperature fluctuation is big etc..
The content of the invention
To overcome the shortcomings of that above-mentioned prior art is present, it is an object of the invention to provide a kind of sensitivity is high, high precision
Temperature survey change-over circuit.
The technical solution adopted for the present invention to solve the technical problems is：A kind of temperature survey change-over circuit, is characterized in that：
Including voltage reference circuit, voltage follower circuit, temperature sensor U7 and voltage amplifier circuit, also including temperature sensor U7's
Resistance bridge circuit, the voltage reference circuit connect the input of voltage follower circuit, the resistance bridge circuit of temperature sensor U7
The outfan connection single-chip microcomputer U3's of the input of connection voltage amplifier circuit, the voltage follower circuit and voltage amplifier circuit
ADC collection terminals.
Preferably, the voltage reference circuit includes fiducial chip U39, exports the reference voltage of 2.5V, the voltage with
Include operational amplifier U4A with circuit, 2.5V reference voltages access the in-phase input end of operational amplifier U4A, and the voltage is put
Big circuit includes operational amplifier U4B, the resistance bridge circuit outfan of the input jointing temp sensor U7 of operational amplifier U4B
The ADC collection terminals of single-chip microcomputer U3 are connect, resistance bridge circuit is also connected with the outfan of operational amplifier U4A, and operational amplifier U4A's is defeated
Go out the ADC collection terminals of end connection single-chip microcomputer U3.
Preferably, the fiducial chip U39 is REF3025, and operational amplifier U4A, U4B are TLV2372.
Preferably, the voltage reference circuit also includes filter capacitor C98, C102, C103, and the voltage follower circuit is also
Including resistance R16, R17, the resistance bridge circuit of the temperature sensor U7 includes resistance R21, R22, R27 and PT100, the electricity
Pressure amplifying circuit also include resistance R23, R25, R26 and R30, the temperature survey change-over circuit also include resistance R18, R24 and
Electric capacity C13～C15, C18；
1 pin of the fiducial chip U39 connects one end of electric capacity C98 and 3.3V voltages, the other end of electric capacity C98 respectively
Ground connection, 3 pins of fiducial chip U39 connect one end of electric capacity C102, C103 and ground respectively, 2 pins connect respectively electric capacity C102,
One end of the other end and resistance R17 of C103, the in-phase input end of another termination operational amplifier U4A of resistance R17, computing are put
The inverting input of big device U4A connects one end of resistance R16 and electric capacity C13 respectively, and outfan connects resistance R16, electric capacity respectively
The other end of one end resistance R18 of the other end and resistance R18 of C13 connects one end of electric capacity C15 and the 13 of single-chip microcomputer U3 respectively
Pin, the other end ground connection of electric capacity C15, the 4 pins ground connection of operational amplifier U4A, 8 pins connect one end of electric capacity C14 respectively
With 3.3V voltages, the other end ground connection of electric capacity C14；
One end of the resistance temperature sensor PT100 connects one end of resistance R21, R23 respectively, and the other end connects respectively
One end and ground of resistance R27, the other end of resistance R21 connect the output of the other end and operational amplifier U4A of resistance R22 respectively
End, the other end of resistance R22 connect one end of the other end and resistance R25 of resistance R27, the other end difference of resistance R23 respectively
One end of the in-phase input end and resistance R26 of concatenation operation amplifier U4B, the other end ground connection of resistance R26, resistance R25's is another
One end of the in-phase input end and resistance R30 of one end difference concatenation operation amplifier U4B, the outfan point of operational amplifier U4B
Not Lian Jie resistance R30 the other end and one end of resistance R24, the other end of resistance R24 connects one end and the list of electric capacity C18 respectively
14 pins of piece machine U3, the other end ground connection of electric capacity C18.
Preferably, the resistance value of described resistance R16～R18, R21～R27, R30 be respectively 1K Ω, 1K Ω, 100 Ω,
5.1K Ω, 5.1K Ω, 1K Ω, 100 Ω, 1K Ω, 50K Ω, 50 Ω, 50K Ω, electric capacity C13～C15, C18, C98, C102, C103
Capacitance be respectively 100nF, 100nF, 100nF, 100nF, 104nF, 100nF, 10 μ F.
Preferably, single-chip microcomputer U3 models STM32F103C8T6.
The invention has the beneficial effects as follows：Compared with prior art, single-chip microcomputer U3 of the invention gathers two computings simultaneously and puts
The output of big device U4A, U4B, can obtain accurate temperature value, effectively can reduce because operational amplifier mains ripple,
ADC Acquisition Errors caused by external factor interference etc., improve the acquisition precision and stability of ADC.
Description of the drawings
Fig. 1 is the structure chart of the present invention；
Fig. 2 is the circuit diagram of temperature measuring circuit of the present invention；
Fig. 3 is the pin figure of single-chip microcomputer of the present invention.
Specific embodiment
Clearly to illustrate the technical characterstic of this programme, below by specific embodiment, and its accompanying drawing is combined, to this
It is bright to be described in detail.
As Figure 1-3, a kind of temperature survey change-over circuit of the invention, it includes voltage reference circuit, voltage follow
Circuit, temperature sensor U7 and voltage amplifier circuit, also including the resistance bridge circuit of temperature sensor U7, the voltage reference electricity
Road connects the input of voltage follower circuit, and the resistance bridge circuit of temperature sensor U7 connects the input of voltage amplifier circuit,
The outfan of the voltage follower circuit and voltage amplifier circuit connects the ADC collection terminals of single-chip microcomputer U3.
The voltage reference circuit includes fiducial chip U39, and model REF3025 exports the reference voltage of 2.5V, described
Voltage follower circuit includes operational amplifier U4A, and 2.5V reference voltages access the in-phase input end of operational amplifier, the voltage
Amplifying circuit includes operational amplifier U4B, the resistance bridge circuit output of the input jointing temp sensor U7 of operational amplifier U4B
The ADC collection terminals of termination single-chip microcomputer U3, resistance bridge circuit are also connected with the outfan of operational amplifier U4A, operational amplifier U4A's
Outfan connects the ADC collection terminals of single-chip microcomputer U3.
The voltage reference circuit also includes filter capacitor C98, C102, C103, and the voltage follower circuit also includes electricity
Resistance R16, R17, the resistance bridge circuit of the temperature sensor U7 include resistance R21, R22, R27 and PT100, the voltage amplification
Circuit also includes resistance R23, R25, R26 and R30, and the temperature survey change-over circuit also includes resistance R18, R24 and electric capacity C13
～C15, C18；
1 pin of the fiducial chip U39 connects one end of electric capacity C98 and 3.3V voltages, the other end of electric capacity C98 respectively
Ground connection, 3 pins of fiducial chip U39 connect one end of electric capacity C102, C103 and ground respectively, 2 pins connect respectively electric capacity C102,
One end of the other end and resistance R17 of C103, the in-phase input end of another termination operational amplifier U4A of resistance R17, computing are put
The inverting input of big device U4A connects one end of resistance R16 and electric capacity C13 respectively, and outfan connects resistance R16, electric capacity respectively
The other end of one end resistance R18 of the other end and resistance R18 of C13 connects one end of electric capacity C15 and the 13 of single-chip microcomputer U3 respectively
Pin, electric capacity C15 the other end ground connection, operational amplifier 4 pins ground connection, 8 pins connect respectively electric capacity C14 one end and
3.3V voltages, the other end ground connection of electric capacity C14；
One end of the resistance temperature sensor PT100 connects one end of resistance R21, R23 respectively, and the other end connects respectively
One end and ground of resistance R27, the other end of resistance R21 connect the output of the other end and operational amplifier U4A of resistance R22 respectively
End, the other end of resistance R22 connect one end of the other end and resistance R25 of resistance R27, the other end difference of resistance R23 respectively
One end of the in-phase input end and resistance R26 of concatenation operation amplifier U4B, the other end ground connection of resistance R26, resistance R25's is another
One end of the in-phase input end and resistance R30 of one end difference concatenation operation amplifier U4B, the outfan of operational amplifier connect respectively
One end of the other end and resistance R24 of connecting resistance R30, the other end of resistance R24 connect one end and the single-chip microcomputer of electric capacity C18 respectively
14 pins of U3, the other end ground connection of electric capacity C18.
Using operational amplifier U4A, U4B as Switching Core, model is TLV2372 to circuit.Operational amplifier U4A and
The voltage follower circuit of resistance R17, R16 composition, for improving the driving force of the 2.5V voltages of fiducial chip U39 outputs；Fortune
The voltage amplifier circuit of amplifier U4B and resistance R23, R25, R26, R30 composition is calculated, by the resistance bridge circuit of temperature sensor U7
The small-signal of output is amplified.The voltage signal of two operational amplifier outputs, while being connected to single-chip microcomputer U3.Actually make
Used time, the interference for often having various extraneous factors, such as power source supplying voltage fluctuation can affect the stability of operational amplifier.
In the present invention, when supply voltage has fluctuation, two operational amplifier U4A, U4B output valves have certain fluctuation, and the two
Fluctuation interference is basically identical.When single-chip microcomputer U3 gathers the output of two operational amplifiers simultaneously, and calculus of differences is done, can be obtained
Glitch-free difference value, difference value is calculated and is tabled look-up obtains comparing accurately temperature value.Therefore the present invention can be effective
Reduce because of ADC Acquisition Errors caused by operational amplifier mains ripple, improve the acquisition precision and stability of ADC.
Preferably, the resistance value of described resistance R16～R18, R21～R27, R30 be respectively 1K Ω, 1K Ω, 100 Ω,
5.1K Ω, 5.1K Ω, 1K Ω, 100 Ω, 1K Ω, 50K Ω, 50 Ω, 50K Ω, electric capacity C13～C15, C18, C98, C102, C103
Capacitance be respectively 100nF, 100nF, 100nF, 100nF, 104nF, 100nF, 10 μ F, the single-chip microcomputer U3 models
STM32F103C8T6。
The above is the preferred embodiment of the present invention, for those skilled in the art,
Without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also regarded as this
Bright protection domain.
Claims (6)
1. a kind of temperature survey change-over circuit, is characterized in that：Including voltage reference circuit, voltage follower circuit, temperature sensor
U7 and voltage amplifier circuit, also including the resistance bridge circuit of temperature sensor U7, the voltage reference circuit connects voltage follow
The input of circuit, the resistance bridge circuit of temperature sensor U7 connect the input of voltage amplifier circuit, the voltage follow electricity
The outfan of road and voltage amplifier circuit connects the ADC collection terminals of single-chip microcomputer U3.
2. a kind of temperature survey change-over circuit according to claim 1, is characterized in that：The voltage reference circuit includes base
Quasi- chip U39, exports the reference voltage of 2.5V, and the voltage follower circuit includes operational amplifier U4A, and 2.5V reference voltages connect
Enter the in-phase input end of operational amplifier U4A, the voltage amplifier circuit includes operational amplifier U4B, operational amplifier U4B's
The resistance bridge circuit outfan of input jointing temp sensor U7 connects the ADC collection terminals of single-chip microcomputer U3, and resistance bridge circuit is also connected with
The outfan of operational amplifier U4A, the outfan of operational amplifier U4A connect the ADC collection terminals of single-chip microcomputer U3.
3. a kind of temperature survey change-over circuit according to claim 2, is characterized in that：The fiducial chip U39 is
REF3025, operational amplifier U4A, U4B are TLV2372.
4. a kind of temperature survey change-over circuit according to claim 2, is characterized in that：The voltage reference circuit also includes
Filter capacitor C98, C102, C103, the voltage follower circuit also include resistance R16, R17, the electricity of the temperature sensor U7
Resistance bridge circuit includes resistance R21, R22, R27 and PT100, the voltage amplifier circuit also include resistance R23, R25, R26 and
R30, the temperature survey change-over circuit also include resistance R18, R24 and electric capacity C13～C15, C18；
1 pin of the fiducial chip U39 connects one end of electric capacity C98 and 3.3V voltages, another termination of electric capacity C98 respectively
Ground, 3 pins of fiducial chip U39 connect one end of electric capacity C102, C103 and ground respectively, 2 pins connect respectively electric capacity C102,
One end of the other end and resistance R17 of C103, the in-phase input end of another termination operational amplifier U4A of resistance R17, computing are put
The inverting input of big device U4A connects one end of resistance R16 and electric capacity C13 respectively, and outfan connects resistance R16, electric capacity respectively
The other end of one end resistance R18 of the other end and resistance R18 of C13 connects one end of electric capacity C15 and the 13 of single-chip microcomputer U3 respectively
Pin, the other end ground connection of electric capacity C15, the 4 pins ground connection of operational amplifier U4A, 8 pins connect one end of electric capacity C14 respectively
With 3.3V voltages, the other end ground connection of electric capacity C14；
One end of the resistance temperature sensor PT100 connects one end of resistance R21, R23 respectively, and the other end connects resistance respectively
One end and ground of R27, the other end of resistance R21 connect the outfan of the other end and operational amplifier U4A of resistance R22 respectively,
The other end of resistance R22 connects one end of the other end of resistance R27 and resistance R25 respectively, and the other end of resistance R23 connects respectively
One end of the in-phase input end and resistance R26 of operational amplifier U4B, the other end ground connection of resistance R26, the other end of resistance R25
One end of the in-phase input end and resistance R30 of difference concatenation operation amplifier U4B, the outfan of operational amplifier U4B connect respectively
One end of the other end and resistance R24 of connecting resistance R30, the other end of resistance R24 connect one end and the single-chip microcomputer of electric capacity C18 respectively
14 pins of U3, the other end ground connection of electric capacity C18.
5. a kind of temperature survey change-over circuit according to claim 4, is characterized in that：The resistance R16～R18, R21～
The resistance value of R27, R30 be respectively 1K Ω, 1K Ω, 100 Ω, 5.1K Ω, 5.1K Ω, 1K Ω, 100 Ω, 1K Ω, 50K Ω, 50
The capacitance of Ω, 50K Ω, electric capacity C13～C15, C18, C98, C102, C103 be respectively 100nF, 100nF, 100nF, 100nF,
104nF、100nF、10μF。
6. a kind of temperature survey change-over circuit according to claim 1, is characterized in that：The single-chip microcomputer U3 models
STM32F103C8T6。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611169647.2A CN106525266A (en) | 2016-12-16 | 2016-12-16 | Temperature measurement conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611169647.2A CN106525266A (en) | 2016-12-16 | 2016-12-16 | Temperature measurement conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106525266A true CN106525266A (en) | 2017-03-22 |
Family
ID=58340245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611169647.2A Pending CN106525266A (en) | 2016-12-16 | 2016-12-16 | Temperature measurement conversion circuit |
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|---|---|
| CN (1) | CN106525266A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203929268U (en) * | 2014-04-14 | 2014-11-05 | 睿励科学仪器（上海）有限公司 | A kind of multichannel temperature measuring system |
| CN105182061A (en) * | 2015-10-20 | 2015-12-23 | 佛山市和融数控软件有限公司 | Ceramic machinery equipment AC current acquisition circuit |
| 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 |
| CN206300734U (en) * | 2016-12-16 | 2017-07-04 | 山东金洲科瑞节能科技有限公司 | A kind of temperature survey change-over circuit |
-
2016
- 2016-12-16 CN CN201611169647.2A patent/CN106525266A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203929268U (en) * | 2014-04-14 | 2014-11-05 | 睿励科学仪器（上海）有限公司 | A kind of multichannel temperature measuring system |
| 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 |
| CN105182061A (en) * | 2015-10-20 | 2015-12-23 | 佛山市和融数控软件有限公司 | Ceramic machinery equipment AC current acquisition circuit |
| CN206300734U (en) * | 2016-12-16 | 2017-07-04 | 山东金洲科瑞节能科技有限公司 | A kind of temperature survey change-over circuit |
Non-Patent Citations (1)
| Title |
|---|
| 王冰: "基于STM32和FPGA的多通道多功能数据采集器" * |
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