CN207280617U - High precision temperature acquisition device based on PT100 - Google Patents
High precision temperature acquisition device based on PT100 Download PDFInfo
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- CN207280617U CN207280617U CN201721235026.XU CN201721235026U CN207280617U CN 207280617 U CN207280617 U CN 207280617U CN 201721235026 U CN201721235026 U CN 201721235026U CN 207280617 U CN207280617 U CN 207280617U
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Abstract
The utility model discloses a kind of high precision temperature acquisition device based on PT100, reference resistance is made using Low Drift Temperature precision resistance, pass through identical constant-current source after sensor and reference resistance series connection, its voltage signal is connected to same amplifier and A/D circuit, in addition the environment temperature of DS18B20 measurement HMTS work is also introduced, the value that reference resistance is varied with temperature is introduced in memory, by comparison reference resistance and sensor voltage value to reach the high-acruracy survey of temperature；The utility model makees reference resistance using Low Drift Temperature precision resistance, pass through identical constant-current source after sensor and reference resistance series connection, its voltage signal is connected to same amplifier and A/D circuit, in addition the environment temperature of DS18B20 measurement HMTS work is also introduced, the value that reference resistance is varied with temperature is introduced in memory, by comparison reference resistance and sensor voltage value to reach the high-acruracy survey of temperature.
Description
Technical field：
A kind of power industry device measuring technical field is the utility model is related to, more particularly to a kind of based on PT100's
High precision temperature acquisition device.
Background technology：
PT100 temperature sensors are since precision is high, stability is good, highly reliable, long lifespan, so being widely used in gas
As fields such as, agricultural, chemical fibre, food, automobile, household electrical appliance, industrial automation measurement and various laboratory apparatus instrument.
But existing sensor simply individually measures operating temperature and influences not to examine caused by operating ambient temperature
Consider, this process can influence temperature detecting precision.
Utility model content：
Technical problem to be solved in the utility model is：Overcome the deficiencies of the prior art and provide one kind and use Low Drift Temperature
Precision resistance makees reference resistance, is connected to same by identical constant-current source, its voltage signal after sensor and reference resistance series connection
Amplifier and A/D circuits, in addition also introduce the environment temperature of DS18B20 measurement HMTS work, reference resistance are varied with temperature
Value introduce memory in, by comparison reference resistance and sensor voltage value with reach temperature high-acruracy survey based on
The high precision temperature acquisition device of PT100.
The technical solution of the utility model is：A kind of high precision temperature acquisition device based on PT100, including microcontroller control
Module, Signal-regulated kinase, A/D modular converters, data memory module, LCD MODULE, PT100 temperature sensors,
The change of temperature is converted into accordingly by the power module of DS18B20, main collector module and power supply, PT100 temperature sensors
Voltage signal exports, and number is stored in after carrying out A/D conversions by A/D modular converters after signal conditioning circuit and amplifying circuit
According to memory module, while DS18B20 measures the environment temperature of main collector module work, the value that reference resistance is varied with temperature
Data memory module is introduced, after single chip control module is to the data processing in data memory module, is sent to LCD MODULE
It has been shown that, while data interaction is realized by RS232 and main collector module；
The Signal-regulated kinase includes TLC2652 chips, TL431 chips and PT100, the TL431 chips with
TLC2652 chips form differential amplifier circuit, and a pin of TLC2652 chips and resistance R11, resistance R12 and switch K1
Series connection, while another pin of TLC2652 chips is connected with resistance R0, resistance R13, resistance R14 and switch K2 and passes through
Resistance R2 be grounded, between the resistance R0 and resistance R13 by circuit with switch K1 be connected, the resistance R11 and resistance R12 and
It is respectively provided between resistance R13 and resistance R14 and is connected branch with PT100.
Another pin of the TLC2652 chips is connected by branch with switch K2.The resistance R0 and R2 is height
Precision resistance, and the resistance R0 is reference resistance.
The beneficial effects of the utility model are：
1st, the utility model makees reference resistance using Low Drift Temperature precision resistance, passes through phase after sensor and reference resistance series connection
Same constant-current source, its voltage signal are connected to same amplifier and A/D circuit, in addition also introduce DS18B20 measurement HMTS work
Environment temperature, the value that reference resistance is varied with temperature are introduced in memory, pass through comparison reference resistance and sensor voltage value
To reach the high-acruracy survey of temperature.
2nd, the utility model AT89C52 microcontrollers are core, and the change of temperature is converted into accordingly by PT100 temperature sensors
Voltage signal output, by modulate circuit and A/D conversion after be sent to microcontroller, microcontroller is sent after data processing to number
Tube module is shown, while realizes data interaction by RS232 and main HMTS.
Brief description of the drawings：
Fig. 1 is the electrical connection block diagram of the high precision temperature acquisition device based on PT100.
Fig. 2 is signal conditioning circuit.
Fig. 3 is work flow diagram.
Embodiment：
Embodiment：Referring to Fig. 1, Fig. 2 and Fig. 3.
High precision temperature acquisition device based on PT100, including single chip control module, Signal-regulated kinase, A/D moduluss of conversion
Block, data memory module, LCD MODULE, PT100 temperature sensors, DS18B20, main collector module and the power supply of power supply
The change of temperature is converted into corresponding voltage signal and exported, by signal conditioning circuit and put by module, PT100 temperature sensors
Data memory module is stored in after carrying out A/D conversions by A/D modular converters after big circuit, while DS18B20 measures main collection
The environment temperature of device module work, the value that reference resistance is varied with temperature introduce data memory module, single chip control module
After the data processing in data memory module, send to LCD MODULE and shown, while pass through RS232 and main collector
Module realizes data interaction；
Signal-regulated kinase includes TLC2652 chips, TL431 chips and PT100, TL431 chip and TLC2652 chip shapes
Into differential amplifier circuit, and a pin of TLC2652 chips is connected with resistance R11, resistance R12 and switch K1, TLC2652 cores
It is grounded while another pin of piece is connected with resistance R0, resistance R13, resistance R14 and switch K2 and by resistance R2, resistance
It is connected between R0 and resistance R13 by circuit with switch K1, between resistance R11 and resistance R12 and resistance R13 and resistance R14
Set and be connected branch with PT100.
Another pin of TLC2652 chips is connected by branch with switch K2.Resistance R0 and R2 are high-accuracy resistance,
And resistance R0 is reference resistance.
As shown in Figure 2.Measuring circuit is designed by the way of four-wire system, and is needed in the structure of this four-wire system
One accurate constant-current source；Further, since the output signal of unit measuring circuit is weaker, it is also necessary to which output signal is carried out direct current
Amplification, carries out A/D conversions again after amplification.
The current value of constant-current source is set to 0.25mA, when switching K1, K2 and controlled by microcontroller, and being in shown position, electricity
Pressure a reference source TL431 make it that the V+ ends input voltage of TLC2652 is 2.5V, according to ideal operational amplifier feature, there is V+=V-=2.5V, and
The no current outflow of V- ends, then the electric current for flowing through R2 is 0.25mA.No current in R12 and R14, then have PT100 electric currents to be equal to R2 electricity
Stream, is 0.25mA, that is, flows through the constant-current source that PT100 is 0.25mA；R0 and R2 selects the high-accuracy resistance with identical temperature drift, when
When switch K1, K2 are in diagram another location, it is also constant 0.25mA to flow through R0 electric currents, will be circuit temperature compensation and school
It is mutatis mutandis.
Using high-precision PT100 sensors thermometric, its temperature value has one-to-one relation with PT100 resistance values, as long as
Obtain accurate RPT100, it is possible to calculate accurate t.The key of temperature survey is to measure the resistance value RPT100 of PT100.Resistance
It is with the corresponding formula of temperature：
RPT100=R0（1+At+Bt2）
Thus can release：
ΔRPT100=R0（AΔt+2BΔt）
During use：The change of temperature is converted into corresponding voltage signal and exported by PT100 temperature sensors, by signal tune
Data memory module, while DS18B20 are stored in after carrying out A/D conversions by A/D modular converters after reason circuit and amplifying circuit
The environment temperature of main collector module work is measured, the value that reference resistance is varied with temperature introduces data memory module, monolithic
After machine control module is to the data processing in data memory module, send to LCD MODULE and shown, while pass through RS232
Data interaction is realized with main collector module.
The above descriptions are merely preferred embodiments of the present invention, and not the utility model is made in any form
Limitation, every any simple modification made according to the technical essence of the utility model to above example, equivalent variations with
Modification, in the range of still falling within technical solutions of the utility model.
Claims (3)
1. a kind of high precision temperature acquisition device based on PT100, including single chip control module, Signal-regulated kinase, A/D conversion
Module, data memory module, LCD MODULE, PT100 temperature sensors, DS18B20, main collector module and the electricity of power supply
Source module, it is characterized in that：The change of temperature is converted into corresponding voltage signal and exported by PT100 temperature sensors, by signal
Data memory module is stored in after carrying out A/D conversions by A/D modular converters after modulate circuit and amplifying circuit, at the same time
DS18B20 measures the environment temperature of main collector module work, and the value that reference resistance is varied with temperature introduces data storage mould
Block, after single chip control module is to the data processing in data memory module, send to LCD MODULE and is shown, leads at the same time
Cross RS232 and realize data interaction with main collector module；
The Signal-regulated kinase includes TLC2652 chips, TL431 chips and PT100, the TL431 chips and TLC2652 cores
Piece forms differential amplifier circuit, and a pin of TLC2652 chips is connected with resistance R11, resistance R12 and switch K1,
While another pin of TLC2652 chips is connected with resistance R0, resistance R13, resistance R14 and switch K2 and by resistance R2
Ground connection, is connected, the resistance R11 and resistance R12 and resistance between the resistance R0 and resistance R13 by circuit with switch K1
It is respectively provided between R13 and resistance R14 and is connected branch with PT100.
2. the high precision temperature acquisition device according to claim 1 based on PT100, it is characterized in that：The TLC2652 chips
Another pin by branch with switch K2 be connected.
3. the high precision temperature acquisition device according to claim 1 based on PT100, it is characterized in that：The resistance R0 and R2
It is high-accuracy resistance, and the resistance R0 is reference resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721235026.XU CN207280617U (en) | 2017-09-25 | 2017-09-25 | High precision temperature acquisition device based on PT100 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721235026.XU CN207280617U (en) | 2017-09-25 | 2017-09-25 | High precision temperature acquisition device based on PT100 |
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| Publication Number | Publication Date |
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| CN207280617U true CN207280617U (en) | 2018-04-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111787428A (en) * | 2020-06-24 | 2020-10-16 | Oppo广东移动通信有限公司 | User terminal equipment |
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2017
- 2017-09-25 CN CN201721235026.XU patent/CN207280617U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111787428A (en) * | 2020-06-24 | 2020-10-16 | Oppo广东移动通信有限公司 | User terminal equipment |
| CN111787428B (en) * | 2020-06-24 | 2022-03-08 | Oppo广东移动通信有限公司 | User terminal equipment |
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