CN206132252U - Unibus high temperature digit temperature sensor - Google Patents
Unibus high temperature digit temperature sensor Download PDFInfo
- Publication number
- CN206132252U CN206132252U CN201621139359.8U CN201621139359U CN206132252U CN 206132252 U CN206132252 U CN 206132252U CN 201621139359 U CN201621139359 U CN 201621139359U CN 206132252 U CN206132252 U CN 206132252U
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- Prior art keywords
- temperature
- operational amplifier
- resistance
- temperature sensor
- chip microcomputer
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Abstract
The utility model discloses an unibus high temperature digit temperature sensor, including singlechip, K type thermocouple, signal conditioning circuit and cold junction compensation circuit, the singlechip embeds there is the AD converter, signal conditioning is connected with K type thermocouple and AD converter respectively, the cold junction compensation circuit is connected with the singlechip, a IO line of singlechip carries out unibus serial communication according to timing requirements with the outside, accepts the external command and exports temperature information to the outside. Unibus high temperature digit temperature sensor in this scheme mainly is to high temperature, temperature province design on a large scale, and with thermocouple sensor, signal conditioning circuit, cold junction compensation circuit, the integrated integration of operation control circuit, single bus input, output constitute single line number word temperature sensor always, measuring range 0 DEG C~1024 DEG C.
Description
Technical field
This utility model is related to temperature sensor field, specifically related to a kind of high-temperature digital temperature sensing of employing monobus
Device.
Background technology
Temperature sensor (temperature transducer) is referred to can be experienced temperature and be converted into usable output signal
Sensor.Temperature sensor is the core of temperature measuring instrument, various in style.By metering system can be divided into contact and
Contactless two big class, according to sensor material and electron component characteristic thermal resistance and the class of thermocouple two are divided into.
K-type thermocouple (nickel chromium triangle-nisiloy) is widely used as temperature sensor, using its pyroelectric effect,
Thermometric is carried out according to the thermo-electromotive force that cold and hot end temperature difference is produced.It is directly contacted with measurand, not by the shadow of intermediate medium
Ring, have the advantages that measurement temperature scope is wide, degree of accuracy is high, simple structure, easy to use.K-type thermocouple have thermoelectrical potential it is big,
Sensitivity height, fast response time, the linearity are good, temperature-measuring range is wider, low cost, good chemical stability, can be 1000
Life-time service at DEG C, thus be the most widely used thermocouple element of commercial production manufacturing sector.But directly made using thermocouple
For Sensor monitoring temperature, the circuits such as modelled signal amplification, shaping, temperature-compensating are needed, the construction cycle is longer, to engineering design
Personnel bring difficulty.And existing digital temperature sensor, measurement temperature narrow range, measurement temperature be low, is not suitable in electrothermic industry
Use.
Utility model content
In order to solve the problems, such as prior art, this utility model provides a kind of monobus high-temperature digital temperature sensing
Device.
To achieve these goals, the technical solution adopted in the utility model is：A kind of monobus high-temperature digital temperature is passed
Sensor, including single-chip microcomputer, K-type thermocouple, signal conditioning circuit and cold junction compensation circuit；The single-chip microcomputer is built-in with A/D conversions
Device；The signal conditioning circuit is electrically connected respectively with K-type thermocouple and A/D converter；The cold junction compensation circuit and single-chip microcomputer
Electrical connection；A piece I/O line of the single-chip microcomputer chronologically requires to carry out monobus serial communication with outside, receives external command simultaneously
To outside output temperature information.
After the technical solution of the utility model, signal conditioning circuit mainly enters to the temperature signal of thermocouple detection
Row amplifies, shaping, and the small-signal for detecting thermocouple is amplified to reach certain voltage value, suitably changes analogue signal
It is easy to process for digital signal.Cold junction compensation is to detect site environment temperature using ordinary temp sensor, is input to single-chip microcomputer
Another I/O end, single-chip microcomputer realizes cold-junction compensation according to the medium temperature law of Thermocouple Circuit.
Monobus high-temperature digital temperature sensor made by this programme is mainly for high temperature, on a large scale temperature province is designed,
Thermocouple sensor, signal conditioning circuit, cold junction compensation circuit, arithmetic control circuit is integrated, monobus input, it is defeated
Go out, constitute 1-wire digital temperature sensor, 0 DEG C～1024 DEG C of temperature-measuring range.
Description of the drawings
Fig. 1 is the theory diagram of monobus high-temperature digital temperature sensor.
Fig. 2 is the circuit diagram of monobus high-temperature digital temperature sensor.
Specific embodiment
The preferred scheme of this utility model is further elaborated below in conjunction with the accompanying drawings：
As depicted in figs. 1 and 2, a kind of monobus high-temperature digital temperature sensor, including single-chip microcomputer, K-type thermocouple, signal
Modulate circuit and cold junction compensation circuit；The single-chip microcomputer is built-in with A/D converter；The signal conditioning circuit is warm with K-type respectively
Galvanic couple and A/D converter are electrically connected；The cold junction compensation circuit and monolithic mechatronics；A piece I/O line of the single-chip microcomputer is pressed
Timing requirements carry out monobus serial communication with outside, receive external command and to outside output temperature information.
Further to improve, the single-chip microcomputer adopts STC8 high-speed microprocessors.
It is further to improve, the signal conditioning circuit include resistance R1, resistance R2, resistance R3, resistance R4, resistance R5,
Electric capacity C1, operational amplifier U2A and operational amplifier U3A；One end of the resistance R1 is connected with the IN1 feet of K-type thermocouple, separately
One end is connected with the negative input end of operational amplifier U2A；One end of the resistance R2 is connected with the IN2 feet of K-type thermocouple, another
End is connected with the positive input terminal of operational amplifier U2A；Resistance R3 one end ground connection, the other end is with operational amplifier U2A just
Input is connected；Described resistance R4 one end is connected with the negative input end of operational amplifier U2A, the other end and operational amplifier U2A
Outfan be connected；Described one end of resistance R5 is connected with the outfan of operational amplifier, and the other end is with operational amplifier U3A's
Positive input terminal is connected；Electric capacity C1 one end ground connection, the other end is connected with the positive input terminal of operational amplifier U3A；The computing
The negative input end of amplifier U3A is connected with operational amplifier U3A outfans by wire；The operational amplifier U3A outfans
It is connected with an I/0 line of single-chip microcomputer.
Further to improve, the cold junction compensation circuit includes resistance R7 and DS18B20 temperature sensor；DS18B20 temperature
The 3rd foot ground connection of degree sensor；The resistance R7 is arranged on first foot (VCC power ends) of DS18B20 temperature sensors and
Between two feet；The crus secunda of the DS18B20 temperature sensors is connected with an I/O line of single-chip microcomputer.
Operation control is using the STC8 series monolithics containing A/D conversions, the voltage signal of the output of signal conditioning circuit
Jing A/D are converted to digital signal, in being stored in single-chip microcomputer.Inside single-chip microcomputer by K-type thermocouple detect treat testing temperature with it is cold
The ambient temperature of end detection, obtains measurement temperature value, in being stored in the caching of single-chip microcomputer through calculating and tabling look-up.In addition, monolithic
A piece I/O line of machine chronologically requires to carry out monobus serial communication with outside, receives external command and to outside output temperature
Information.
Cold junction compensation circuit is that site environment temperature is detected using the temperature sensor of common DS18B20 models, input
To another I/O end of single-chip microcomputer, single-chip microcomputer realizes cold-junction compensation according to the medium temperature law of K-type Thermocouple Circuit：
Thermocouple Circuit is constituted by the conductor of two kinds of different materials, when dut temperature (the working end temperature or hot junction also known as K-type thermocouple
Temperature) be t, cold junction temperature be t0 when, K-type thermocouple output thermoelectrical potential be EAB (t, t0)=EAB (t, 0)-EAB (t0,0).
Wherein AB represents two kinds of conductors of different nature of composition thermocouple, and (t, 0) represents that K-type pyrometer fire-end temperature is t to EAB, cold
Hold for 0 DEG C when thermoelectrical potential, EAB (t0,0) represent cold junction compensation thermoelectrical potential.Known by medium temperature law, if cold junction temperature is permanent
It is fixed, as long as then measuring thermoelectrical potential EAB (t, t0) of K-type thermocouple output, by look into tested thermocouple indexing table obtain EAB (t0,
0), you can calculate thermoelectrical potential when thermocouple cold junction is 0 DEG C, then look into the thermocouple indexing table and obtain actual pyrometer fire-end
Temperature.If cold junction temperature fluctuates, by compensating wire, according to middle conductor law, cold end is guided to into the position of temperature constant
Put, then the tested end temperature of K-type thermocouple is obtained using said method.
The core circuit of monobus high-temperature digital temperature sensor adopts STC8 high-speed microprocessors, is internally embedded 12 A/D
Transducer so that this temperature sensor high precision is up to 0.25 DEG C.The temperature signal of K-type thermocouple detection passes through signal conditioning circuit
The P0.0 mouths of single-chip microcomputer are sent into after amplification；Cold junction compensation detects scene temperature using DS18B20, and the P3.1 mouths of single-chip microcomputer read in now
Field temperature, Jing internal arithmetics are processed and carry out temperature-compensating；The temperature of detection is compensated to be stored in buffer, is passed through by external circuit
P3.0 mouths carry out the temperature value that monobus reads measurement.
Claims (4)
1. a kind of monobus high-temperature digital temperature sensor, it is characterised in that：Including single-chip microcomputer, K-type thermocouple, signal condition electricity
Road and cold junction compensation circuit；The single-chip microcomputer is built-in with A/D converter；The signal conditioning circuit respectively with K-type thermocouple and
A/D converter is electrically connected；The cold junction compensation circuit and monolithic mechatronics；A piece I/O line of the single-chip microcomputer chronologically will
Ask carries out monobus serial communication with outside, receives external command and to outside output temperature information.
2. monobus high-temperature digital temperature sensor according to claim 1, it is characterised in that：The single-chip microcomputer is adopted
STC8 high-speed microprocessors.
3. monobus high-temperature digital temperature sensor according to claim 2, it is characterised in that：The signal conditioning circuit
Including resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electric capacity C1, operational amplifier U2A and operational amplifier U3A；Institute
State one end of resistance R1 to be connected with the IN1 feet of K-type thermocouple, the other end is connected with the negative input end of operational amplifier U2A；It is described
One end of resistance R2 is connected with the I N2 feet of K-type thermocouple, and the other end is connected with the positive input terminal of operational amplifier U2A；It is described
Resistance R3 one end is grounded, and the other end is connected with the positive input terminal of operational amplifier U2A；Described resistance R4 one end and operational amplifier
The negative input end of U2A is connected, and the other end is connected with the outfan of operational amplifier U2A；Put with computing one end of the resistance R5
The outfan of big device is connected, and the other end is connected with the positive input terminal of operational amplifier U3A；Electric capacity C1 one end ground connection is another
End is connected with the positive input terminal of operational amplifier U3A；The negative input end of the operational amplifier U3A is defeated with operational amplifier U3A
Go out end to be connected by wire；The operational amplifier U3A outfans are connected with an I/0 line of single-chip microcomputer.
4. monobus high-temperature digital temperature sensor according to claim 3, it is characterised in that：The cold junction compensation circuit
Including resistance R7 and DS18B20 temperature sensor；The 3rd foot ground connection of DS18B20 temperature sensors；The resistance R7 is arranged on
Between first foot of DS18B20 temperature sensors and crus secunda；The crus secunda of the DS18B20 temperature sensors and single-chip microcomputer
A piece I/O line is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621139359.8U CN206132252U (en) | 2016-10-19 | 2016-10-19 | Unibus high temperature digit temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621139359.8U CN206132252U (en) | 2016-10-19 | 2016-10-19 | Unibus high temperature digit temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206132252U true CN206132252U (en) | 2017-04-26 |
Family
ID=58572932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621139359.8U Expired - Fee Related CN206132252U (en) | 2016-10-19 | 2016-10-19 | Unibus high temperature digit temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206132252U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107588861A (en) * | 2017-09-27 | 2018-01-16 | 陈畅 | A kind of industrial temperature measurer |
-
2016
- 2016-10-19 CN CN201621139359.8U patent/CN206132252U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107588861A (en) * | 2017-09-27 | 2018-01-16 | 陈畅 | A kind of industrial temperature measurer |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170426 Termination date: 20171019 |
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| CF01 | Termination of patent right due to non-payment of annual fee |