CN109613944A - A kind of temperature measurement and control instrument and its method - Google Patents
A kind of temperature measurement and control instrument and its method Download PDFInfo
- Publication number
- CN109613944A CN109613944A CN201811616805.3A CN201811616805A CN109613944A CN 109613944 A CN109613944 A CN 109613944A CN 201811616805 A CN201811616805 A CN 201811616805A CN 109613944 A CN109613944 A CN 109613944A
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- circuit
- temperature
- resistance
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
-
- 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
Abstract
The present invention discloses a kind of temperature measurement and control instrument and its method, which includes: electric bridge sample circuit, and electric bridge sample circuit is for sampling the output electric signal of temperature sensor；Difference channel, difference channel is for eliminating measured deviation caused by line impedance；ADC conversion circuit, ADC conversion circuit is for eliminating nonlinearity erron；Main control chip, main control chip is for carrying out data processing；Display circuit, display circuit are used for real-time display temperature value；Relay circuit, relay circuit control for realizing the on-off of controlled device.The present invention has the advantages that micromation, low-power consumption, high-performance, strong antijamming capability, particularly suitable for multi-point temperature TT&C system.
Description
Technical field
Present invention relates particularly to a kind of temperature measurement and control instrument and its methods.
Background technique
Since temperature is one of main controlled parameter in industrial production, thus measurement and control of temperature system metallurgy, chemical industry,
The fields such as machinery, food are widely applied.The process control frequently encountered in industrial processes, some technical process are to its temperature
The control effect of degree directly affects the quality of product.Measurement and control of temperature plays very crucial work in the modern industrial production process
With and the necessary condition that is operated normally according to scheduled scheme of equipment.
However, existing industrial equipment temperature control system circuit stability is poor, precision is low, real-time display effect is poor.
Summary of the invention
In order to solve the above-mentioned technical problem, the invention proposes a kind of temperature measurement and control instrument and its methods, with miniature
The advantages of change, low-power consumption, high-performance, strong antijamming capability, particularly suitable for multi-point temperature TT&C system.
In order to achieve the above object, technical scheme is as follows:
A kind of temperature measurement and control instrument, comprising:
Electric bridge sample circuit, electric bridge sample circuit is for sampling the output electric signal of temperature sensor；
The input terminal of difference channel, difference channel is electrically connected with the output end of electric bridge sample circuit, and difference channel is for disappearing
Except measured deviation caused by line impedance；
ADC conversion circuit, the input terminal of ADC conversion circuit are electrically connected with the output end of difference channel, ADC conversion circuit
For eliminating nonlinearity erron；
The input terminal of main control chip, main control chip is electrically connected with the output end of ADC conversion circuit, the output end of main control chip
It is electrically connected respectively with display circuit and relay circuit, main control chip is for carrying out data processing；
Display circuit, the input terminal of display circuit are electrically connected with the output end of main control chip, and display circuit is for aobvious in real time
Temperature displaying function numerical value；
Relay circuit, the input terminal of relay circuit are electrically connected with the output end of main control chip, relay circuit it is defeated
Outlet is electrically connected with controlled device, and relay circuit controls for realizing the on-off of controlled device.
The present invention disclose a kind of temperature measurement and control instrument and its method, has micromation, low-power consumption, high-performance, resists and do
The strong advantage of ability is disturbed, particularly suitable for multi-point temperature TT&C system.
Based on the above technical solution, following improvement can also be done:
Further, electric bridge sample circuit includes the first bridge arm and the second bridge arm being connected in parallel；
First bridge arm includes: the calibration potentiometer RV2 and resistance R1 of series connection, calibration potentiometer RV2 and resistance R1 it
Between current potential be VA；
Second bridge arm includes: resistance temperature sensor RV1 and resistance R2, between resistance temperature sensor RV1 and resistance R2
Current potential be VB.
Further, difference channel includes: operational amplifier, resistance R3, resistance R4, resistance R5 and resistance R6；
The positive input terminal of operational amplifier is electrically connected by resistance R4 with current potential VB, and the positive input terminal of operational amplifier is also
It is electrically connected with resistance R6；
The negative input end of operational amplifier is electrically connected by resistance R3 with current potential VA, and the negative input end of operational amplifier is also
It is electrically connected by resistance R5 with the output end of operational amplifier.
Further, the output voltage V0 of difference channel are as follows:
Further, operational amplifier uses LM741 integrated chip, is equipped with amplitude limiter circuit in the output end of operational amplifier,
Amplitude limiter circuit includes: diode VD2 and diode VD3.
Further, main control chip uses STC single-chip microcontroller.
Further, relay circuit includes: PNP triode, diode D1 and relay；
The base stage of PNP triode is electrically connected with the driving end of main control chip, and collector and the relay of PNP triode are electrically connected
It connecing, and diode D1 is parallel to the both ends of relay, the cathode of diode D1 is electrically connected with the collector of PNP triode, and two
The plus earth of pole pipe D1.
Further, temperature measurement and control instrument further include: data input circuit, data input circuit are used for one or more of
The input of information: the upper limit of environment temperature, the lower limit of environment temperature, the control information of interruption, function switch information.
A kind of measurement and control of temperature method, is controlled using temperature measurement and control instrument, specifically includes the following steps:
(1) electric bridge sample circuit samples the output electric signal of temperature sensor, and electric bridge sample circuit will sample electricity
Signal is sent to difference channel；
(2) difference channel eliminates measured deviation difference channel caused by line impedance and output electric signal is sent to ADC turns
Change circuit；
(3) ADC conversion circuit eliminates nonlinearity erron, and ADC conversion circuit is sent to main control chip for electric signal is exported；
(4) real-time environment temperature is sent to display circuit to main control chip by electric signal based on the received and relay is electric
Road, display circuit show that relay circuit controls the on-off of controlled device to real time environment temperature.
Further, when the lower limit of the upper limit of data input circuit input environment temperature and environment temperature,
When environment temperature is more than the upper limit, relay disconnects automatically；
When environment temperature is lower than lower limit, relay automatic pick.
Detailed description of the invention
Fig. 1 is one of the structural schematic diagram of thermal insulation fire-resistant window provided in an embodiment of the present invention.
Fig. 2 is difference channel structure schematic diagram provided in an embodiment of the present invention.
Fig. 3 is relay circuit simulated effect schematic diagram provided in an embodiment of the present invention.
Fig. 4 is function button structural schematic diagram provided in an embodiment of the present invention.
Fig. 5 is FLAG implementation process diagram provided in an embodiment of the present invention.
Fig. 6 is total simulation effect diagram provided in an embodiment of the present invention.
Wherein: 1 window frame, 11 window frame fire resistant cores.
Specific embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
In order to reach the purpose of the present invention, in some of embodiments of a kind of temperature measurement and control instrument and its method,
As shown in Figure 1, a kind of temperature measurement and control instrument, comprising:
Electric bridge sample circuit, electric bridge sample circuit is for sampling the output electric signal of temperature sensor；
The input terminal of difference channel, difference channel is electrically connected with the output end of electric bridge sample circuit, and difference channel is for disappearing
Except measured deviation caused by line impedance；
ADC conversion circuit, the input terminal of ADC conversion circuit are electrically connected with the output end of difference channel, ADC conversion circuit
For eliminating nonlinearity erron；
The input terminal of main control chip, main control chip is electrically connected with the output end of ADC conversion circuit, the output end of main control chip
It is electrically connected respectively with display circuit and relay circuit, main control chip is for carrying out data processing；
Display circuit, the input terminal of display circuit are electrically connected with the output end of main control chip, and display circuit is for aobvious in real time
Temperature displaying function numerical value；
Relay circuit, the input terminal of relay circuit are electrically connected with the output end of main control chip, relay circuit it is defeated
Outlet is electrically connected with controlled device, and relay circuit controls for realizing the on-off of controlled device.
The present invention disclose a kind of temperature measurement and control instrument and its method, has micromation, low-power consumption, high-performance, resists and do
The strong advantage of ability is disturbed, particularly suitable for multi-point temperature TT&C system.
In order to further optimize implementation result of the invention, in other embodiment, remaining feature technology phase
Together, the difference is that, as shown in Fig. 2, electric bridge sample circuit includes the first bridge arm and the second bridge arm being connected in parallel；
First bridge arm includes: the calibration potentiometer RV2 and resistance R1 of series connection, calibration potentiometer RV2 and resistance R1 it
Between current potential be VA；
Second bridge arm includes: resistance temperature sensor RV1 and resistance R2, between resistance temperature sensor RV1 and resistance R2
Current potential be VB.
Further, as shown in Fig. 2, difference channel includes: operational amplifier, resistance R3, resistance R4, resistance R5 and electricity
Hinder R6；
The positive input terminal of operational amplifier is electrically connected by resistance R4 with current potential VB, and the positive input terminal of operational amplifier is also
It is electrically connected with resistance R6；
The negative input end of operational amplifier is electrically connected by resistance R3 with current potential VA, and the negative input end of operational amplifier is also
It is electrically connected by resistance R5 with the output end of operational amplifier.
Further, the output voltage V0 of difference channel are as follows:
Further, operational amplifier uses LM741 integrated chip, is equipped with amplitude limiter circuit in the output end of operational amplifier,
Amplitude limiter circuit includes: diode VD2 and diode VD3.
Further, main control chip uses STC single-chip microcontroller.
Further, relay circuit includes: PNP triode, diode D1 and relay；
The base stage of PNP triode is electrically connected with the driving end of main control chip, and collector and the relay of PNP triode are electrically connected
It connecing, and diode D1 is parallel to the both ends of relay, the cathode of diode D1 is electrically connected with the collector of PNP triode, and two
The plus earth of pole pipe D1.
In order to further optimize implementation result of the invention, in other embodiment, remaining feature technology phase
Together, the difference is that, temperature measurement and control instrument further include: data input circuit, data input circuit is for following a kind of or more
The input of kind information: the upper limit of environment temperature, the lower limit of environment temperature, the control information of interruption, function switch information.
A kind of measurement and control of temperature method, is controlled using temperature measurement and control instrument, specifically includes the following steps:
(1) electric bridge sample circuit samples the output electric signal of temperature sensor, and electric bridge sample circuit will sample electricity
Signal is sent to difference channel；
(2) difference channel eliminates measured deviation caused by line impedance, and difference channel will export electric signal and be sent to ADC turns
Change circuit；
(3) ADC conversion circuit eliminates nonlinearity erron, and ADC conversion circuit is sent to main control chip for electric signal is exported；
(4) real-time environment temperature is sent to display circuit and relay electricity by main control chip electric signal based on the received
Road, display circuit show that relay circuit controls the on-off of controlled device to real time environment temperature.
Further, when the lower limit of the upper limit of data input circuit input environment temperature and environment temperature,
When environment temperature is more than the upper limit, relay disconnects automatically；
When environment temperature is lower than lower limit, relay automatic pick.
In order to show superiority of the invention, acquisition of the three line PT100 temperature sensors as temperature signal is used below
Device carries out experimental verification.
Since the resistance value of PT100 platinum sensor changes depending on changes in ambient temperature, so to obtain temperature
Data just first have to obtain resistance value, it are then changed into electric signal and is exported.
Electric bridge sample circuit disclosed by the invention can carry out good sampling, according to PT100 phasing meter environment temperature
For degree at 0 DEG C, PT100 resistance value is 100 Ω, therefore the RV1 of 200 Ω is selected to simulate three line PT100 in Proteus simulation software
Platinum resistance temperature sensor, RV2 are a calibration potentiometers.RV1 is adjusted under initial situation makes the resistance value of RV1 be adjusted to 100 Ω
(i.e. temperature value shows 0 DEG C) keeps the current potential of VA and VB two o'clock equal, even if electric bridge reaches equilibrium condition by adjusting RV2.
Circuit structure is as shown in Figure 2.
As environment temperature rises, risen according to the resistance value of the definition platinum resistance of PT100, then electric bridge disequilibrium
(current potential of VB rises, because the current potential of VA is environment temperature at 0 DEG C, PT100 resistance value is the reference voltage of 100 Ω, then
VB and VA forms potential difference).It can realize that the operation amplifier of electric signal is acted on using differential amplifier circuit using this feature, it is poor
The voltage output formula of parallel circuit are as follows:
Since when RV1 value is 138.51 Ω, environment temperature is 100 DEG C corresponding.Feedback by calculating, in difference channel
Resistance R5 value is 33K Ω, while output voltage VO is 5.018V.The device as used in difference channel is LM741 integrated
Chip, the chip power supply are that+12V and -12V, then positive saturation voltage and negative saturation voltage are respectively+12V and -12V, institute
With (i.e. rising of the PT100 temperature sensor with environment temperature, the continuation of platinum resistance when RV1 value has exceeded 138.51 Ω
Rise), difference channel also operates at linear amplification region, the voltage value higher than 5V will be continued to output, until saturation voltage 12V.For
The voltage value maximum value 5V for exporting difference channel output end uses diode VD2 and VD3 composition amplitude limiter circuit, when
When RV1 value is 100 Ω -138.51 Ω, the voltage value (0-5V) of output, for subsequent ADC conversion circuit as input signal.
Relay is a kind of device for power switching, it is not only able to realize the function of vulnerabilities scan forceful electric power, while can also
Has the function of isolation.Diode D1 in Fig. 3 is damage of the self-induction high voltage to circuit in order to prevent, is shielded.By
It is limited in the driving capability of single-chip microcontroller pin, positive-negative-positive high power transistor control circuit is commonly used in practical applications.
The specific working principle is as follows:
When main control chip driving end P1.7 output high level, the emitter and collector of PNP triode is turned off, PNP
Triode is equivalent to switch and disconnects；
When main control chip driving end P1.7 output low level, the emitter and collector of PNP triode is saturated, PNP
Triode, which is equivalent to, to be closed the switch, then relay coil, which is powered, is attracted, and controlled device power-off stops working.
The controlled device of the present apparatus carries out analog simulation with 12V battery and light bulb in Proteus simulation software, to reach
To true effect in kind.Relay circuit simulated effect is as shown in Figure 3.
Automatic pick relay function when disconnecting relay when the present apparatus has beyond ceiling temperature, being lower than lower limit temperature.
In this embodiment, data input circuit selects function button, or other input circuits are (such as: touch screen, microphone
Deng)
Function button sets four function keys, as shown in Figure 4.KEY1, KEY2 in Fig. 4 are mainly to environment temperature
Upper and lower bound set, be initially at 90 DEG C of program setting ceiling temperature, 30 DEG C of lower limit temperature.When user needs to equipment
When the upper lower limit value of temperature is modified, can by the external interrupt technology of main control chip realize to temperature bound carry out+
With-operation.KEY3 mainly passes through the judgement of FLAG flag bit and interrupts setting whether processing is over, passes through this key if having terminated
Return to display present real-time temperature.KEY4 is mainly function switch key (the selection function of setting ceiling temperature or lower limit temperature
Can).
Display circuit is mainly to pass through P0 mouth of main control chip to export main control chip treated data, passes through P3 mouthfuls of portion
It separates foot and position choosing is carried out to charactron, to reach the dynamic display of functional of charactron.According to the resistance real-time display equipment of PT100
Current Temperatures numerical value, the limit value and lower numerical limit that can also be set according to function key switching display devices.
The workflow of temperature measurement and control instrument disclosed in the present embodiment is as follows:
Firstly, by P1 mouth to main control chip and timer internal T0 using interrupt techniques generate CLK pulse signal into
Row initial configuration guarantees the output digital quantity that ADC conversion circuit can be stable.
Secondly, the delivery outlet of ADC conversion circuit and the P2 mouth of main control chip are correspondingly connected with.Main control chip is obtained from P2 mouthfuls
The digital quantity of ADC conversion circuit conversion carries out theoretical calculation and obtains real time temperature numerical value, and passes through charactron dynamic scanning displaying.
Again, the present apparatus can be compared according to upper and lower bound temperature value set by user with current environmental temperature numerical value
Compared with 90 DEG C of equipment ceiling temperature initially set, 30 DEG C of lower limit temperature；
When environment temperature is more than the upper limit, the P1.7 of main control chip exports low level, when environment temperature is lower than lower limit, master control core
The P1.7 of piece exports high level.
If user wants to adjust the upper and lower bound of device temperature, external interrupt INT0 and external interrupt INT1 can be passed through
Incremental and decrement function is realized using interrupt techniques.
KEY4 key is function selecting key, can switch the upper limit or lower limit, and default is limit value under primary condition.
FLAG flag bit in Fig. 5 is primarily used to judge whether there is external interrupt generation, if without FLAG be 0 after
It is continuous to execute display program down, it otherwise turns to and executes interrupt handling routine (because interrupting may occur at any time, in order to flow
Journey figure embodies interruption process, so having used FLAG flag bit).The flow chart of temperature-measuring control device is as shown in Figure 5.
In experimentation, by adjusting RV1 numerical value (simulation PT100b with variation of ambient temperature resistance value variation),
Real-time display current environmental temperature on charactron can pass through the P1.7 of main control chip by the device temperature bound of setting
Pin output low and high level controls PNP triode work in cut-off and saturation state, and then to relay, i.e. realization pair
The control of controlled device reaches the expected purpose of experiment.
Present apparatus total simulation effect picture is as shown in Figure 6.
By the way that the numerical value of RV1 is varied multiple times, real-time display data on charactron are recorded.And by currently practical temperature
It spends and compares with the temperature value of charactron real-time display, verify the data precision of the system, normally transported with reaching industrial equipment
Row condition, it is indicated that the validity and accuracy of the present apparatus.
It to sum up states, the present invention is sampled using the electric signal that electric bridge sample circuit exports temperature sensor, is used
LM741 difference channel eliminates measured deviation caused by line impedance, eliminates temperature control system using ADC conversion circuit successive approximation method
Nonlinearity erron, data processing is carried out as main control chip using STC High Performance SCM, and being capable of real-time display temperature number
The function of value and specific setting bound, realizes finally by solid-state relay and controls controlled device on-off, stability is good,
Precision is high, real-time display effect is good.
For the preferred embodiment of the present invention, it is noted that for those of ordinary skill in the art, do not taking off
Under the premise of from the invention design, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.
Claims (10)
1. a kind of temperature measurement and control instrument characterized by comprising
Electric bridge sample circuit, the electric bridge sample circuit is for sampling the output electric signal of temperature sensor；
Difference channel, the input terminal of the difference channel are electrically connected with the output end of the electric bridge sample circuit, the differential electrical
Road is for eliminating measured deviation caused by line impedance；
The input terminal of ADC conversion circuit, the ADC conversion circuit is electrically connected with the output end of the difference channel, and the ADC turns
Circuit is changed for eliminating nonlinearity erron；
Main control chip, the input terminal of the main control chip are electrically connected with the output end of the ADC conversion circuit, the main control chip
Output end be electrically connected respectively with display circuit and relay circuit, the main control chip is for carrying out data processing；
Display circuit, the input terminal of the display circuit are electrically connected with the output end of the main control chip, and the display circuit is used
In real-time display temperature value；
Relay circuit, the input terminal of the relay circuit are electrically connected with the output end of the main control chip, the relay
The output end of circuit is electrically connected with controlled device, and the relay circuit controls for realizing the on-off of controlled device.
2. temperature measurement and control instrument according to claim 1, which is characterized in that the electric bridge sample circuit includes being connected in parallel
The first bridge arm and the second bridge arm；
First bridge arm includes: the calibration potentiometer RV2 and resistance R1, the calibration potentiometer RV2 and resistance of series connection
Current potential between R1 is VA；
Second bridge arm includes: resistance temperature sensor RV1 and resistance R2, the resistance temperature sensor RV1 and resistance R2
Between current potential be VB.
3. temperature measurement and control instrument according to claim 2, which is characterized in that the difference channel include: operational amplifier,
Resistance R3, resistance R4, resistance R5 and resistance R6；
The positive input terminal of the operational amplifier is electrically connected by resistance R4 with current potential VB, and the positive input of the operational amplifier
End is also electrically connected with resistance R6；
The negative input end of the operational amplifier is electrically connected by resistance R3 with current potential VA, and the negative input of the operational amplifier
End is also electrically connected by resistance R5 with the output end of the operational amplifier.
4. temperature measurement and control instrument according to claim 3, which is characterized in that the output voltage V0 of the difference channel are as follows:
5. temperature measurement and control instrument according to claim 4, which is characterized in that the operational amplifier is integrated using LM741
Chip is equipped with amplitude limiter circuit in the output end of the operational amplifier, and the amplitude limiter circuit includes: diode VD2 and diode
VD3。
6. temperature measurement and control instrument according to claim 1, which is characterized in that the main control chip uses STC single-chip microcontroller.
7. temperature measurement and control instrument according to claim 1-6, which is characterized in that the relay circuit includes:
PNP triode, diode D1 and relay；
The base stage of PNP triode is electrically connected with the driving end of the main control chip, the collector of PNP triode and the relay
Electrical connection, and diode D1 is parallel to the both ends of the relay, the cathode of diode D1 and the collector of PNP triode are electrically connected
It connects, and the plus earth of diode D1.
8. temperature measurement and control instrument according to claim 7, which is characterized in that the temperature measurement and control instrument further include: data
Input circuit, the data input circuit are used for the input of one or more of information: the upper limit, the environment temperature of environment temperature
Lower limit, interruption control information, function switch information.
9. a kind of measurement and control of temperature method, which is characterized in that using as the described in any item temperature measurement and control instruments of claim 1-8 into
Row control, specifically includes the following steps:
(1) electric bridge sample circuit samples the output electric signal of temperature sensor, and electric bridge sample circuit will sample electric signal
It is sent to difference channel；
(2) difference channel eliminates measured deviation caused by line impedance, and difference channel will export electric signal and be sent to ADC conversion electricity
Road；
(3) ADC conversion circuit eliminates nonlinearity erron, and ADC conversion circuit is sent to main control chip for electric signal is exported；
(4) main control chip electric signal based on the received, is sent to display circuit and relay circuit for real-time environment temperature, institute
It states display circuit to show real time environment temperature, relay circuit controls the on-off of controlled device.
10. measurement and control of temperature method according to claim 9, which is characterized in that the data input circuit input environment temperature
When the lower limit of the upper limit of degree and environment temperature,
When environment temperature is more than the upper limit, relay disconnects automatically；
When environment temperature is lower than lower limit, relay automatic pick.
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| CN201811616805.3A CN109613944A (en) | 2018-12-27 | 2018-12-27 | A kind of temperature measurement and control instrument and its method |
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| CN201811616805.3A CN109613944A (en) | 2018-12-27 | 2018-12-27 | A kind of temperature measurement and control instrument and its method |
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Cited By (1)
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| CN110260996A (en) * | 2019-07-22 | 2019-09-20 | 武汉能众科技有限公司 | A kind of thermocouple sensor with credible temperature |
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