CN108646811A - System and method for realizing automatic temperature control based on single chip microcomputer - Google Patents
System and method for realizing automatic temperature control based on single chip microcomputer Download PDFInfo
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- CN108646811A CN108646811A CN201810757555.9A CN201810757555A CN108646811A CN 108646811 A CN108646811 A CN 108646811A CN 201810757555 A CN201810757555 A CN 201810757555A CN 108646811 A CN108646811 A CN 108646811A
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- 238000000034 method Methods 0.000 title description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 40
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 18
- 239000010703 silicon Substances 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 230000015654 memory Effects 0.000 claims description 15
- 229910018487 Ni—Cr Inorganic materials 0.000 claims description 11
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical group [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000001360 synchronised effect Effects 0.000 abstract description 4
- 238000012824 chemical production Methods 0.000 abstract 1
- 230000008859 change Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
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- 238000009776 industrial production Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000013139 quantization Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
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- 238000012271 agricultural production Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000003831 deregulation Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple
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- Control Of Resistance Heating (AREA)
Abstract
The invention discloses a system for realizing automatic temperature control based on a single chip microcomputer, wherein the system comprises a power supply, the single chip microcomputer, a heating module, a temperature detection element, a temperature control circuit, an interface circuit and a zero-crossing signal generator, the heating module is heated by the single chip microcomputer and exists as a detected object in the system, the temperature detection element detects the temperature of the heating module, the temperature control circuit controls the temperature of the heating module, the interface circuit realizes the expansion of the single chip microcomputer, the zero-crossing signal generator generates a zero-crossing synchronous pulse, and the zero-crossing synchronous pulse is used as a starting synchronous pulse of a silicon controlled rectifier and is added to the temperature control circuit. The invention can realize the temperature control within the range of 0-1000 ℃, has high precision, high processing speed and low price, and is suitable for a plurality of fields of metallurgical industry, chemical production, electric power engineering, mechanical manufacturing, food processing and the like.
Description
Technical field
The present invention relates to fire control and disaster rescue security technology areas, more specifically, it relates to a kind of automatic fire alarm system.
Background technology
With the raising of China's expanding economy and living standards of the people, automatic control technology industrial and agricultural production, business,
The each department such as traffic, scientific research and sphere of life are widely used.It is excessively program-controlled in modern industrial production process automation
Technology processed is being to realize various optimal technical indicators, increase economic efficiency and labor productivity, energy saving, improvement labour
Condition, environmental protection health etc. play increasing effect.It is process control oil, chemical industry, metallurgy, machinery, electric power, light
Extensive use in the production process of the industrial departments such as work, weaving, building materials, atomic energy, and it is also more in emerging building automation
Using.Wherein temperature control be in scientific research and actual production it is commonly used one kind control system, for ensure production safety into
Row, improves the quality of production, reduces the labour of worker, saves manpower, energy saving etc., is often required to realize the automatic control of temperature
System.There are many previous temperature controlled circuit system, have analog circuit to constitute, what digital circuit was constituted etc., but its circuit is complicated
And control effect is bad, is only used for the lower occasion of some required precisions, to realize that high-precision temperature automatic control just must
Computer control system must be used, with the development of singlechip technology, motor function constantly enhances, and the speed of service constantly carries
Height can not only be used for constituting sequence control system, the closed loop real-time control of industrial process can also be completed with it.Therefore,
It is a kind of trend using automatically controlling for chip microcontroller temperature.
Invention content
It is a kind of automatic based on chip microcontroller temperature in view of the deficiencies of the prior art, the present invention intends to provide
The system of control.The present invention can realize that the temperature within the scope of 0 DEG C -1000 DEG C controls, and precision is high, and processing speed is fast, and price is low
It is honest and clean, suitable for many fields such as metallurgical industry, Chemical Manufacture, power engineering, machine-building and food processing.
To achieve the above object, the present invention provides following technical solutions：
A kind of system based on chip microcontroller temperature automatic control, wherein the system comprises power supply, microcontroller, heating
Module, temperature detecting element, temperature-control circuit, interface circuit and zero cross signal generator；Wherein：
The microcontroller is connect with the interface circuit, and the interface circuit turns comprising memory, latch and A/D
Change unit；
The temperature detecting element is also associated with variation device, and the output end of the temperature detecting element with change the defeated of device
Enter end connection, and the output end of the temperature detecting element passes through the input terminal for changing device and the A/D converting units
Connection；
The input terminal of the zero cross signal generator is connect with the power supply, the output end of the zero cross signal generator with
The input terminal of the microcontroller connects；
The heating module is connect with the power supply, and the heating module is set as the inspection of the temperature detecting element
Survey object；
The temperature-control circuit includes controllable silicon power regulator circuit, and the input terminal of the temperature-control circuit with it is described
The output end of heating module connects.
By using above-mentioned technical proposal so that heating module is by conducting self-heating, as the object being detected in system
And exist, temperature detecting element detects the temperature of heating module, and temperature-control circuit controls the temperature of heating module, interface circuit
The extension and zero cross signal generator for realizing microcontroller generate zero passage lock-out pulse, and zero passage lock-out pulse is as silicon-controlled
The lock-out pulse that sets out is added to temperature-control circuit.
Further, the power supply is 220V alternating currents.
By using above-mentioned technical proposal, use 220V alternating currents for heating module and zero cross signal generator and other confessions
Electric module for power supply.
Further, the memory be the extendable program memory based on 2732 chips, the latch be based on
The expansible external memory of 74LS373 chips.
By using above-mentioned technical proposal, the storage of microcontroller can be made to be extended.
Further, the A/D converting units are 8 successive approximation A/D analog-digital converters.
By using above-mentioned technical proposal, the analog signal of input can be converted to digital signal, for microcontroller into line number
According to processing.
Further, the interface circuit includes 8155 chips with programmable parallel I/O interfaces, and 8155 core
Piece further includes keyboard and LED display windows.
By using above-mentioned technical proposal, microcontroller can be accessed by I/O interfaces, can be realized to microcontroller by keyboard
Setting, the processing data of microcontroller are shown by LED display windows, are observed in real time convenient for user.
Further, the temperature detecting element is nickel chromium triangle/nickel aluminothermy galvanic couple.
By using above-mentioned technical proposal, it disclosure satisfy that high temperature detects, nickel chromium triangle/nickel aluminothermy galvanic couple is suitable for 0 DEG C -1000 DEG C
Measurement range, corresponding output voltage be 0mV-41.32mV therefore can be detected within the scope of this.
Further, the heating module is nickel chromium triangle electrothermal alloy heater strip.
By using above-mentioned technical proposal high temperature is disclosure satisfy that since nickel chromium triangle can bear 0 DEG C -1000 DEG C of temperature
Heating.
Further, the microcontroller is MCS-51 series monolithics.
By using above-mentioned technical proposal, function is more, and processing speed is fast, and area is small, cheap, is easy to get.
Further, the zero cross signal generator includes zero-cross triggering circuit.
By using above-mentioned technical proposal, zero passage lock-out pulse can be generated, zero passage lock-out pulse is a kind of 50HZ alternating currents
Press through the pulse of zero moment, can make it is silicon-controlled trigger admittance in alternating voltage sine wave zero passage, pulse information is provided.
Further, the zero-cross triggering circuit includes voltage comparator, and the voltage comparator is connected with double monostables
Trigger, double monostable flipflops are connected with crystal amplifier tube, output end and the heated mould of the crystal amplifier tube
Block connects, and the heating module connects the power supply.
By using above-mentioned technical proposal, voltage comparator LM311 becomes square wave, square wave for 50Hz sinusoidal voltages
Positive edge and negative side along respectively as two monostable flipflops input trigger signal, steady state trigger output it is two narrow
Pulse can just obtain the zero passage lock-out pulse corresponding to alternating current 220V alternating current after diode and/or door mixing, this pulse is on the one hand
It is added to temperature-control circuit as the silicon-controlled lock-out pulse that sets out, is on the other hand also added to microcontroller as counting pulse.
Description of the drawings
Fig. 1 is total system control circuit schematic diagram provided by the invention；
Fig. 2 is the relation schematic diagram of controllable silicon power regulator output power and make-and-break time；
Fig. 3 is zero-cross triggering circuit schematic diagram in zero cross signal generator in Fig. 1.
Specific implementation mode
Embodiment：
Below in conjunction with attached drawing 1-3, invention is further described in detail.
A kind of system based on chip microcontroller temperature automatic control, if Fig. 1-is shown, the system comprises power supply, monolithics
Machine, heating module, temperature detecting element, temperature-control circuit, interface circuit and zero cross signal generator；Wherein：
The microcontroller is connect with the interface circuit, and the interface circuit turns comprising memory, latch and A/D
Change unit；
The temperature detecting element is also associated with variation device, and the output end of the temperature detecting element with change the defeated of device
Enter end connection, and the output end of the temperature detecting element passes through the input terminal for changing device and the A/D converting units
Connection；
The input terminal of the zero cross signal generator is connect with the power supply, the output end of the zero cross signal generator with
The input terminal of the microcontroller connects；
The heating module is connect with the power supply, and the heating module is set as the inspection of the temperature detecting element
Survey object；
The temperature-control circuit includes controllable silicon power regulator circuit, and the input terminal of the temperature-control circuit with it is described
The output end of heating module connects.
Passing through above-described embodiment so that heating module exists by conducting self-heating as the object being detected in system,
Temperature detecting element detects the temperature of heating module, and temperature-control circuit controls the temperature of heating module, and interface circuit is realized single
The extension of piece machine and zero cross signal generator generate zero passage lock-out pulse, and zero passage lock-out pulse is same as silicon-controlled setting out
Pace pulse is added to temperature-control circuit.
In the present invention, the power supply is 220V alternating currents.It is that heating module and zero cross signal are sent out by using 220V alternating currents
Raw device and the power supply of other power supply modules.
In the present invention, the memory is the extendable program memory based on 2732 chips, and the latch is base
In the expansible external memory of 74LS373 chips.Its expansible storage as microcontroller.74LS373 is common address
Latch chip, its essence be one is the 8D triggers exported with Three-State, in order to extend outside in SCM system
Memory.
In the present invention, the A/D converting units are 8 successive approximation A/D analog-digital converters.ADC0809 is the U.S.
8 channel of CMOS technology of National Semiconductor's production, 8 successive approximation A/D analog-digital converters.ADC0809 is sampling frequency
Rate be 8, the device that mould-number is converted carried out with Approach by inchmeal principle.It is internal there are one 8 channel variable connectors, it can be with
The signal after decoding is latched according to address code, only gates a progress A/D conversion in 8 road analog input signals.Turned by A/D
Digital signal can be converted to by the analog signal of input by changing unit, and data processing is carried out for microcontroller.
In the present invention, the interface circuit includes 8155 chips with programmable parallel I/O interfaces, and described 8155
Chip further includes keyboard and LED display windows.In a particular embodiment, 8031 interface circuit has 8155,2732 and ADC0809
Equal chips.8155 be used for keyboard/LED display interfaces, 2732 can as 8031 external ROM memory, ADC0809 is temperature
The input interface of measuring circuit.In this embodiment, microcontroller can be accessed by I/O interfaces, can be realized to list by keyboard
The setting of piece machine is shown the processing data of microcontroller by LED display windows, is observed in real time convenient for user.The present invention's posts
Storage is a plastic package chip for having 40 pins using 8155, and function is stronger, is widely applied in computer circuits.It has two
A 8 mouths A, B and 6 mouth C, can expand 22 wiring in total.It contains a counter that can be preset, count range
From 2 to 16383, it can be used for being delayed, count or divide.Its internal RAM for also having 256 bytes, can supplement CPU memories not
Foot.In order to which the working method of chip is arranged and understands the state of chip, there be command register and status register in inside.
In the present invention, the temperature detecting element is nickel chromium triangle/nickel aluminothermy galvanic couple, and nickel chromium triangle/nickel aluminothermy galvanic couple is suitable for 0
DEG C -1000 DEG C of measurement range, therefore corresponding output voltage is 0mV-41.32mV can be detected, energy within the scope of this
Enough meet high temperature detection.
In the present invention, the heating module is nickel chromium triangle electrothermal alloy heater strip.Since nickel chromium triangle can bear 0 DEG C -1000 DEG C
Temperature, therefore disclosure satisfy that high-temperature heating.Transmitter is made of millivolt transmitter and current/voltage transmitter：Millivolt pick-up
The electric current that device is used to be transformed into the 0-41.32mV that thermocouple exports within the scope of 0-10mA；Current/voltage transmitter is used millivolt
The 0-10mA current transformations of transmitter output are at the voltage within the scope of 0-5V.In order to improve measurement accuracy, transmitter can carry out
Zero shift.Such as：If temperature measurement range is 400 DEG C -1000 DEG C, thermocouple output is 16.4V-41.32mV, and millivolt becomes
0-10mA range currents are exported after sending device zero shift.In this way, quantization temperature error can be made to reach using 8 A/D converters
Within ± 2.34 DEG C.
In the present invention, the microcontroller is MCS-51 series monolithics.It is more for MCS-51 series monolithic functions, processing
Speed is fast, and area is small, cheap, is easy to get.
In the present invention, the zero cross signal generator includes zero-cross triggering circuit.The circuit can generate zero passage and synchronize arteries and veins
Punching, zero passage lock-out pulse is a kind of pulse at 50HZ alternating voltage zero-crossings moment, can be made silicon-controlled in alternating voltage sine wave mistake
Admittance is triggered when zero, and pulse information is provided.
In invention, the zero-cross triggering circuit includes voltage comparator, and the voltage comparator is connected with double monostables
Trigger, double monostable flipflops are connected with crystal amplifier tube, output end and the heated mould of the crystal amplifier tube
Block connects, and the heating module connects the power supply.Voltage comparator LM311 becomes square wave for 50Hz sinusoidal voltages,
The positive edge and negative side of square wave are along the input trigger signal respectively as two monostable flipflops, and the two of steady state trigger output
A burst pulse can just obtain the zero passage lock-out pulse corresponding to alternating current 220V alternating current, this pulse one after diode and/or door mixing
Aspect is added to temperature-control circuit as the silicon-controlled lock-out pulse that sets out, and is on the other hand also added to monolithic as counting pulse
Machine.
In conclusion the invention has the advantages that：
1, the present invention uses nickel chromium triangle electrothermal alloy heater strip for heating module, disclosure satisfy that 0 DEG C -1000 DEG C of high temperature adds
Heat, it is simple in structure, measurement range is wide, and response speed is very fast the features such as；
2, data detection data is handled using MCS-51 series monolithics, and is controlled, it is easy to control, simple
The advantages that big with flexibility, and the technical indicator of controlled temperature can be increased substantially, so as to greatly improve product
Quality and quantity；
3, the 0-10mA current transformations for exporting transmitter in the present invention substantially increase survey at the voltage within the scope of 0-5V
Accuracy of measurement；
4, the present invention can be such that quantization temperature error reaches within ± 2.34 DEG C using 8 A/D converters, and precision is high；
5, microcontroller of the present invention is to the control of temperature being realized by controllable silicon power regulator circuit, in period demand T,
As long as the turn-on time of 8031 change thyristors can change heater strip power, to achieve the purpose that adjust temperature, using side
Just.
Operation principle：
In specific work process, circuit is connected in the way of Fig. 1 so that heating module is by conducting self-heating, as being
In system be detected object and exist, temperature detecting element detect heating module temperature, temperature-control circuit control heated mould
The temperature of block, interface circuit realizes the extension of microcontroller and zero cross signal generator generates zero passage lock-out pulse, and zero passage synchronizes
Pulse is added to temperature-control circuit as the silicon-controlled lock-out pulse that sets out.In a particular embodiment, bidirectional triode thyristor pipe and plus
Heated filament is serially connected in alternating current 220V, 50HZ electric mains circuit.In period demand T, as long as 8031 change the connection of thyristor
Time can change heater strip power, you can realize the purpose for adjusting temperature.As shown in Fig. 2, it has gone out thyristor given
There is the case where different turn-on times in cycle T.Obviously, the silicon-controlled power within 100% time of period demand T when connection
It is maximum.Silicon-controlled turn-on time can pass through the extremely upper trigger pulse control of SCR control.The trigger pulse uses software by 8031
It is generated on P1.3 pins, silicon-controlled control pole is sent to through optocoupler pipe and driver output after being synchronized by zero passage lock-out pulse
On.
Wherein zero passage lock-out pulse is a kind of pulse at 50HZ alternating voltage zero-crossings moment, can be made silicon-controlled in alternating voltage
Admittance is triggered when sine wave zero passage.Zero passage lock-out pulse is generated by zero-cross triggering circuit, as shown in figure 3, voltage comparator LM311
Become square wave for 50Hz sinusoidal voltages, the positive edge and negative side of square wave are along respectively as the defeated of two monostable flipflops
Enter trigger signal, two burst pulses of monostable flipflop output can just obtain corresponding to exchange after diode and/or door mixing
On the one hand the zero passage lock-out pulse of 220V alternating currents, this pulse are added to temperature-control circuit as the silicon-controlled lock-out pulse that sets out,
On the other hand 8031 ends T0 and T1 are also added to as counting pulse.
Using Resistance furnace temperature control as embodiment, last Resistance furnace temperature control uses deviation control methods, deviation control
Principle is the deviation for first finding out actual measurement furnace temperature to required furnace temperature, and control signal de-regulation resistance is then obtained to deviation processing
The heating power of stove, to realize the control to furnace temperature.Industrially, deviation control is also known as PI D controls, this is industrial process
A kind of most widely used control form, can generally receive satisfactory effect in control.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, people in the art
Member can as needed make the present embodiment the modification of not creative contribution after reading this specification, but as long as at this
It is all protected by Patent Law in the right of invention.
Claims (10)
1. a kind of system based on chip microcontroller temperature automatic control, it is characterised in that：The system comprises power supply, monolithics
Machine, heating module, temperature detecting element, temperature-control circuit, interface circuit and zero cross signal generator；Wherein：
The microcontroller is connect with the interface circuit, and the interface circuit includes that memory, latch and A/D conversions are single
Member；
The temperature detecting element is also associated with variation device, and the input terminal of the output end of the temperature detecting element and variation device
Connection, and the output end of the temperature detecting element is connect by the variation device with the input terminal of the A/D converting units；
The input terminal of the zero cross signal generator is connect with the power supply, the output end of the zero cross signal generator with it is described
The input terminal of microcontroller connects；
The heating module is connect with the power supply, and the heating module is set as the detection pair of the temperature detecting element
As；
The temperature-control circuit includes controllable silicon power regulator circuit, and the input terminal of the temperature-control circuit and the heating
The output end of module connects.
2. a kind of system based on chip microcontroller temperature automatic control according to claim 1, it is characterised in that：It is described
Power supply is 220V alternating currents.
3. a kind of system based on chip microcontroller temperature automatic control according to claim 1, it is characterised in that：It is described
Memory is the extendable program memory based on 2732 chips, and the latch is expansible outer based on 74LS373 chips
Portion's memory.
4. a kind of system based on chip microcontroller temperature automatic control according to claim 1, it is characterised in that：It is described
A/D converting units are 8 successive approximation A/D analog-digital converters.
5. a kind of system based on chip microcontroller temperature automatic control according to claim 4, it is characterised in that：It is described
Interface circuit includes 8155 chips with programmable parallel I/O interfaces, and 8155 chip further includes that keyboard and LED are shown
Window.
6. a kind of system based on chip microcontroller temperature automatic control according to claim 1, it is characterised in that：It is described
Temperature detecting element is nickel chromium triangle/nickel aluminothermy galvanic couple.
7. a kind of system based on chip microcontroller temperature automatic control according to claim 1, it is characterised in that：It is described
Heating module is nickel chromium triangle electrothermal alloy heater strip.
8. a kind of system based on chip microcontroller temperature automatic control according to claim 1, it is characterised in that：It is described
Microcontroller is MCS-51 series monolithics.
9. a kind of system based on chip microcontroller temperature automatic control according to claim 1, it is characterised in that：It is described
Zero cross signal generator includes zero-cross triggering circuit.
10. a kind of system based on chip microcontroller temperature automatic control according to claim 9, it is characterised in that：Institute
It includes voltage comparator to state zero-cross triggering circuit, and the voltage comparator is connected with double monostable flipflops, double monostables
Trigger is connected with crystal amplifier tube, and the output end of the crystal amplifier tube is connect with the heating module, the heating module
Connect the power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810757555.9A CN108646811A (en) | 2018-07-11 | 2018-07-11 | System and method for realizing automatic temperature control based on single chip microcomputer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810757555.9A CN108646811A (en) | 2018-07-11 | 2018-07-11 | System and method for realizing automatic temperature control based on single chip microcomputer |
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| CN111678616A (en) * | 2020-05-13 | 2020-09-18 | 中国电力科学研究院有限公司 | Temperature measurement system and method for short circuit test of power cable and cable accessory |
| CN113566991A (en) * | 2021-07-28 | 2021-10-29 | 深圳市玄羽科技有限公司 | Water temperature detection method and system based on temperature sensor technology |
| CN114204164A (en) * | 2021-12-08 | 2022-03-18 | 华中科技大学 | Intelligent temperature control system and method applied to liquid metal battery pack |
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Application publication date: 20181012 |