CN108020339A - A kind of thermal resistance measuring circuit for exempting from input calibration - Google Patents
A kind of thermal resistance measuring circuit for exempting from input calibration Download PDFInfo
- Publication number
- CN108020339A CN108020339A CN201711431799.XA CN201711431799A CN108020339A CN 108020339 A CN108020339 A CN 108020339A CN 201711431799 A CN201711431799 A CN 201711431799A CN 108020339 A CN108020339 A CN 108020339A
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- China
- Prior art keywords
- input
- thermal resistance
- exempting
- measuring circuit
- analog switch
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Classifications
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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
Abstract
The invention discloses a kind of thermal resistance measuring circuit for exempting from input calibration, including input unit, analog switch unit and microcontroller, input unit includes power supply, first resistor, second resistance and treats bolometric, and power supply is respectively with first resistor, second resistance and treating that bolometric is connected；The first input end of analog switch unit is respectively with first resistor, second resistance and treating that one end of bolometric is connected；Second input terminal of analog switch unit is respectively with first resistor, second resistance and treating that the other end of bolometric is connected；The first output terminal and the second output terminal of analog switch unit are connected with the input terminal of microcontroller respectively；The first control terminal and the second control terminal of analog switch unit are connected with the output terminal of microcontroller respectively.The thermal resistance measuring circuit provided by the invention for exempting from input calibration, it inputs without demarcating, has saved the time, improves production efficiency；Effectively avoid mistake and failure caused by artificial origin.
Description
Technical field
The present invention relates to a kind of thermal resistance measuring circuit for exempting from input calibration.
Background technology
Intelligent thermal resistance measuring device, such as：Various thermal resistance temperature transmitters, resistance and temperature display, are going out
It is required for calibration to input before factory.Calibration input refers to precision resistance case difference zero setting resistance, full scale resistance, intelligent heat
Electric resistance measuring apparatus records resistance value at this time as benchmark.Such a method is than time-consuming, to calibration facility and personnel
It is it is required that high.
The content of the invention
In view of the shortcomings of the prior art, exempt to input the thermal resistance measuring circuit demarcated the object of the present invention is to provide a kind of,
It is inputted without demarcating, and has been saved the time, improves production efficiency；Effectively avoid mistake and failure caused by artificial origin.
To achieve the above object, the present invention provides a kind of thermal resistance measuring circuit for exempting from input calibration, including input are single
Member, analog switch unit and microcontroller, input unit include power supply, first resistor, second resistance and treat bolometric, power supply
Respectively with first resistor, second resistance and treating that bolometric is connected；The first input end of analog switch unit is electric with first respectively
Resistance, second resistance are connected with the one end for treating bolometric；Second input terminal of analog switch unit respectively with first resistor, second
Resistance is connected with the other end for treating bolometric；The first output terminal and the second output terminal of analog switch unit respectively with microcontroller
The input terminal connection of device；The first control terminal and the second control terminal of analog switch unit connect with the output terminal of microcontroller respectively
Connect.
Compared with prior art, the thermal resistance measuring circuit disclosed by the invention for exempting from input calibration, passes through microcontroller
Output control analog switch unit, makes the input of analog switch respectively be first resistor, second resistance and testing resistance two
The voltage at end, and the voltage signal is exported to microcontroller, using the microcontroller with analog-digital conversion function, microcontroller
By the signal processing and calculate, you can testing resistance resistance value is calculated；This exempts from the thermal resistance measuring circuit of input calibration, its nothing
Input need to be demarcated, has been saved the time, improves production efficiency；Effectively avoid mistake and failure caused by artificial origin.
Another embodiment according to the present invention, thermal resistance measuring circuit further comprise signal amplifier, and signal is put
The input terminal of big device is connected with the first output terminal of analog switch unit and the second output terminal respectively；The output terminal of signal amplifier
It is connected with the input terminal of microcontroller.
Another embodiment according to the present invention, thermal resistance measuring circuit further comprise a/d converter, a/d converter
Input terminal and the output terminal of signal amplifier connect, the input terminal of the output terminal of a/d converter and microcontroller connects.
Another embodiment according to the present invention, power supply are DC constant flowing power.
Another embodiment according to the present invention, power supply 0.1-1mA.
Another embodiment according to the present invention, first resistor are full scale reference resistance；Second resistance is zero degree benchmark
Resistance.
Another embodiment according to the present invention, signal amplifier are programmable signal amplifying circuit.
Another embodiment according to the present invention, precision≤0.02% of first resistor, temperature drift≤10ppm/ DEG C；
Precision≤0.02% of second resistance, temperature drift≤10ppm/ DEG C.
The invention has the advantages that：By the output control analog switch unit of microcontroller, make analog switch
Input respectively be the voltage of first resistor, second resistance and testing resistance both ends, and the voltage signal is exported to can
Program amplifier；Processing is amplified, voltage signal is converted into corresponding digital quantity through a/d converter after, is stored in microcontroller
In depositing, microcontroller is calculated so as to obtain the resistance value of testing resistance.This exempts from the thermal resistance measuring circuit of input calibration, it is without mark
Fixed input, has been saved the time, improves production efficiency；Effectively avoid mistake and failure caused by artificial origin；Meanwhile using this
Measuring circuit can offset zero point and full scale drift, measurement result precision higher.
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment, belongs to the scope of protection of the invention.
Brief description of the drawings
Fig. 1 is the circuit diagram for the thermal resistance measuring circuit for exempting from input calibration that embodiment 1 provides.
Embodiment
Embodiment 1
It is the circuit diagram provided in this embodiment for exempting from the thermal resistance measuring circuit that input is demarcated referring to Fig. 1.This exempts from input mark
Fixed thermal resistance measuring circuit includes：Input unit, analog switch unit U1, signal amplifier U2, a/d converter U3 and micro-control
Device U4 processed.
In the present embodiment, signal amplifier U2 is pga circuit, i.e. PGA.
Input unit includes power supply, first resistor RS, second resistance RZ and treats bolometric Ri, and power supply is electric with first respectively
Hinder RS, second resistance RZ and treat that bolometric Ri connects.
The pin X1 of the first input end of the analog switch unit U1 and pin Y1 of the second input terminal respectively with first resistor
The both ends connection of RS；The pin X2 of the first input end of the analog switch unit U1 and pin Y2 of the second input terminal is respectively with second
The both ends connection of resistance RZ；The pin X3 of the first input end of the analog switch unit U1 and pin Y3 of the second input terminal respectively with
Treat the both ends connection of bolometric Ri；The first output terminal of the first control terminal A and microcontroller U4 of analog switch unit U1 connect
Connect, the second control terminal B of analog switch unit U1 and the second output terminal of microcontroller connect；The first of analog switch unit U1 is defeated
The input terminal of outlet X and the second output terminal Y respectively with signal amplifier U23 is connected；The output terminal of signal amplifier U2 turns with AD
The input terminal connection of parallel operation U3, the output terminal of a/d converter U3 are connected with the input terminal of microcontroller U4.
In the present embodiment, the first control terminal A and the second control terminal B of analog switch unit U1 are gating control terminal.
In the present embodiment, power supply is DC constant flowing power, power supply 0.1-1mA.First resistor is full scale reference resistance；
Second resistance is zero degree reference resistance；Precision≤0.02% of first resistor, temperature drift≤10ppm/ DEG C；The essence of second resistance
Degree≤0.02%, temperature drift≤10ppm/ DEG C.
The workflow of the present embodiment is as follows：
1st, the first control terminal output low level of microcontroller U4, the second control terminal input low level, the of analog switch
One control terminal A and the second control terminal receive low level signal respectively, make the pin X1 of the first input end of analog switch unit U1
Conducting, the second input terminal pin Y1 conductings；The both ends of first resistor RS are by access analog switch unit U1, analog switch unit U1
The positive and negative both ends of voltage VS, VS in output first resistor are linked into signal amplifier U2 and are amplified processing, turn by AD
Parallel operation U3 is converted into corresponding digital quantity ADS, is stored in the memory of microcontroller U4.
2nd, the first control terminal output high level, the second control terminal input low level of microcontroller U4, the of analog switch
One control terminal A receives the high level signal, and the second control terminal receives the low level signal, makes that analog switch unit U1's is first defeated
Enter pin X2 conductings, the second input terminal pin Y2 conductings at end；The both ends of second resistance RZ are by access analog switch unit U1, mould
The positive and negative both ends of voltage VZ, VZ in plan switch element U1 output second resistances are linked into signal amplifier U2 and are amplified place
Reason, is converted into corresponding digital quantity ADZ by a/d converter U3, is stored in the memory of microcontroller U4.
3rd, the first control terminal output low level of microcontroller U4, the second control terminal input high level, the of analog switch
One control terminal A receives the low level signal, and the second control terminal receives the high level signal, makes that analog switch unit U1's is first defeated
Enter pin X3 conductings, the second input terminal pin Y3 conductings at end；The both ends of bolometric Ri are treated by access analog switch unit U1,
Analog switch unit U1 outputs treat that the positive and negative both ends of voltage Vi, Vi on bolometric Ri are linked into signal amplifier U2 progress
Enhanced processing, is converted into corresponding digital quantity ADi by a/d converter U3, is stored in the memory of microcontroller U4.
4th, since RZ and RS are resistance values it is known that microcontroller U4 is calculated the resistance value of Ri by formula.Formula is：Ri=
(ADi-ADZ)/(ADS-ADZ) * (RS-RZ)+RZ.
Even if can be seen that PGA and A/D converter from above-mentioned calculation formula occurs null offset, ADi, ADZ, ADS be through
Cross what same PGA and A/D converter were got, their null offset amount be it is identical, then (Vi-VZ)/(VS-VZ) point
Son and denominator can subtract null offset automatically by doing subtraction.As a same reason, if the amplification factor of PGA and A/D converter by
Time and temperature influence to produce drift, then Vi, VZ, VS are by same PGA and A/D converter, and molecule and denominator are put
Big multiple all changes at the same time, after molecule denominator is divided by, can also balance out the drift of PGA amplification factors.
The thermal resistance measuring circuit provided in this embodiment for exempting from input calibration, is simulated by the output control of microcontroller U4
Switch element U1, makes the input of analog switch respectively be the voltage of first resistor, second resistance and testing resistance both ends, and
The voltage signal is exported to programmable amplifier；Processing is amplified, is converted into voltage signal pair through a/d converter after
Digital quantity is answered, is stored in microcontroller memory, microcontroller U4 is calculated so as to obtain the resistance value of testing resistance.This exempts from input calibration
Thermal resistance measuring circuit, it inputs without demarcating, has saved the time, improves production efficiency；Effectively avoid caused by artificial origin
Mistake and failure；Meanwhile zero point and full scale drift, measurement result precision higher can be offset using the measuring circuit.
Although the present invention is disclosed above with preferred embodiment, the scope that the present invention is implemented is not limited to.Any
The those of ordinary skill in field, in the invention scope for not departing from the present invention, improves when can make a little, i.e., every according to this hair
Bright done equal improvement, should be the scope of the present invention and is covered.
Claims (8)
- A kind of 1. thermal resistance measuring circuit for exempting from input calibration, it is characterised in that including：Input unit, analog switch unit and Microcontroller, the input unit include power supply, first resistor, second resistance and treat bolometric, the power supply respectively with institute State first resistor, the second resistance and it is described treat bolometric connect；The first input end difference of the analog switch unit It is connected with the first resistor, the second resistance and described one end for treating bolometric；The second of the analog switch unit Input terminal is connected with the first resistor, the second resistance and the other end for treating bolometric respectively；The simulation is opened The input terminal of the first output terminal and the second output terminal of unit respectively with the microcontroller is closed to be connected；The analog switch unit Output terminal respectively with the microcontroller of the first control terminal and the second control terminal be connected.
- 2. the thermal resistance measuring circuit as claimed in claim 1 for exempting from input calibration, it is characterised in that the thermal resistance measurement electricity Road further comprises signal amplifier, input terminal the first output with the analog switch unit respectively of the signal amplifier End is connected with the second output terminal；The output terminal of the signal amplifier is connected with the input terminal of the microcontroller.
- 3. the thermal resistance measuring circuit as claimed in claim 2 for exempting from input calibration, it is characterised in that the thermal resistance measurement electricity Road further comprises a/d converter, and the input terminal of the a/d converter is connected with the output terminal of the signal amplifier, the AD The output terminal of converter is connected with the input terminal of the microcontroller.
- 4. the thermal resistance measuring circuit as claimed in claim 1 for exempting from input calibration, it is characterised in that the power supply is permanent for direct current Galvanic electricity source.
- 5. the thermal resistance measuring circuit as claimed in claim 4 for exempting from input calibration, it is characterised in that the power supply is 0.1- 1mA。
- 6. the thermal resistance measuring circuit as claimed in claim 1 for exempting from input calibration, it is characterised in that the first resistor is full Spend reference resistance；The second resistance is zero degree reference resistance.
- 7. the as claimed in claim 2 thermal resistance measuring circuit for exempting from input calibration, it is characterised in that the signal amplifier is Programmable signal amplifying circuit.
- 8. the thermal resistance measuring circuit as claimed in claim 1 for exempting from input calibration, it is characterised in that the essence of the first resistor Degree≤0.02%, temperature drift≤10ppm/ DEG C；Precision≤0.02% of the second resistance, temperature drift≤10ppm/ DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711431799.XA CN108020339A (en) | 2017-12-25 | 2017-12-25 | A kind of thermal resistance measuring circuit for exempting from input calibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711431799.XA CN108020339A (en) | 2017-12-25 | 2017-12-25 | A kind of thermal resistance measuring circuit for exempting from input calibration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108020339A true CN108020339A (en) | 2018-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711431799.XA Pending CN108020339A (en) | 2017-12-25 | 2017-12-25 | A kind of thermal resistance measuring circuit for exempting from input calibration |
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| CN (1) | CN108020339A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111256864A (en) * | 2020-03-19 | 2020-06-09 | 上海卫星工程研究所 | Multipoint temperature measuring method and system based on serial connection of multiple thermistors |
| CN111504491A (en) * | 2020-05-28 | 2020-08-07 | 为麦智能科技(天津)有限公司 | Data processing method, temperature detection circuit and electronic equipment |
| CN112212908A (en) * | 2020-10-10 | 2021-01-12 | 北京航空航天大学 | Intelligent sensor and intelligent method thereof |
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| EP0302002A1 (en) * | 1987-07-30 | 1989-02-01 | Siemens Aktiengesellschaft | Method for converting an analogue input signal into a digital output signal |
| JPH05110350A (en) * | 1991-10-18 | 1993-04-30 | Yamatake Honeywell Co Ltd | Input offset voltage correcting device |
| CN101467013A (en) * | 2006-07-17 | 2009-06-24 | 梅特勒-托利多公开股份有限公司 | Method and apparatus for measuring temperature |
| CN101498749A (en) * | 2008-02-01 | 2009-08-05 | 凯迈（洛阳）测控有限公司 | Accurate resistor measuring apparatus and method thereof |
| CN202582775U (en) * | 2011-11-28 | 2012-12-05 | 凯迈（洛阳）环测有限公司 | Temperature measuring circuit |
-
2017
- 2017-12-25 CN CN201711431799.XA patent/CN108020339A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0302002A1 (en) * | 1987-07-30 | 1989-02-01 | Siemens Aktiengesellschaft | Method for converting an analogue input signal into a digital output signal |
| JPH05110350A (en) * | 1991-10-18 | 1993-04-30 | Yamatake Honeywell Co Ltd | Input offset voltage correcting device |
| CN101467013A (en) * | 2006-07-17 | 2009-06-24 | 梅特勒-托利多公开股份有限公司 | Method and apparatus for measuring temperature |
| CN101498749A (en) * | 2008-02-01 | 2009-08-05 | 凯迈（洛阳）测控有限公司 | Accurate resistor measuring apparatus and method thereof |
| CN202582775U (en) * | 2011-11-28 | 2012-12-05 | 凯迈（洛阳）环测有限公司 | Temperature measuring circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111256864A (en) * | 2020-03-19 | 2020-06-09 | 上海卫星工程研究所 | Multipoint temperature measuring method and system based on serial connection of multiple thermistors |
| CN111504491A (en) * | 2020-05-28 | 2020-08-07 | 为麦智能科技(天津)有限公司 | Data processing method, temperature detection circuit and electronic equipment |
| CN111504491B (en) * | 2020-05-28 | 2022-05-10 | 为麦智能科技(天津)有限公司 | Data processing method, temperature detection circuit and electronic equipment |
| CN112212908A (en) * | 2020-10-10 | 2021-01-12 | 北京航空航天大学 | Intelligent sensor and intelligent method thereof |
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Application publication date: 20180511 |
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