CN102109861A - High-frequency PWM (pulse width modulation) temperature control device and control method for thermal analyzer - Google Patents
High-frequency PWM (pulse width modulation) temperature control device and control method for thermal analyzer Download PDFInfo
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Abstract
The invention belongs to the technical field of thermoanalysis, in particular to a high-frequency PWM temperature control device and a control method for a thermal analyzer. The temperature control device includes a microcontroller module, a power control module and a temperature measurement module connected with a microcontroller respectively, an AC-DC voltage stabilization module and an interference rejection module connected with the power control module, and a heating wire connected with the interference rejection module; and the temperature measurement module further includes a thermocouple voltage measurement module and a cold junction compensation module. The AC-DC voltage stabilization module is used for converting AC to stable DC, and the power control module is used for receiving high-frequency PWM signals output by the microcontroller; and the microcontroller detects the thermocouple voltage and the cold junction temperature, obtains the actual temperature, and dynamically regulates the duty factor of the PWM signals output by the microcontroller. The invention further provides the control method suitable for the temperature control device, and can realize the high-precision temperature control required by the thermal analyzer.
Description
Technical field
The invention belongs to the thermoanalysis technology field, be specifically related to a kind of temperature control equipment and control method, relate in particular to a kind of temperature control equipment and control method that is suitable for thermal analyzer.
Background technology
The instrument of thermal analyzer some physical change that is amalyzing substances in heating or cooling procedure and chemical change and gradient of temperature relation.Thermal-analysis instrumentation commonly used has thermogravimetric analyzer (TGA), differential thermal analyzer (DTA), differential scanning calorimeter (DSC) and thermomechanical analyzer (TMA) etc.The program temperature control mode that adopts above-mentioned appliance requires realizes high-precision temperature control, comprises constant heatingrate/cooling, constant temperature, even various modes such as refining temperature, the direct impact analysis result of temperature controlled accuracy.
Temperature control equipment commonly used generally adopts zero trigger mode and thyristor operating angle control mode in the thermal analyzer at present.Zero trigger mode is in the setting-up time interval, and the cycle that changes the thyristor conducting is realized the adjusting of power.Its conducting electric current, cut-off current are zero, have reduced the interference to electrical network.But exist power control to be difficult to reach the drawback of high-resolution.As calculating by China 50HZ civil power, the power adjustment cycle is 10 seconds, and power control resolution only can reach 1/600.And modern thermal analyzer heating rate scope from 0.1 spend/assign to 100 degree/minute, coarse resolution is difficult to realize accurately temperature control.The thyristor operating angle control mode is adjusted power by changing conduction angle, comprises trigonometric function, realize the linearity adjustment of power, and the calculated amount of conduction angle is very big, and the interference that the SCR control mode is brought is difficult to eliminate.In addition, above-mentioned two kinds of temperature control methods, also there is bigger influence in the fluctuation of civil power to the temperature control effect.
Summary of the invention
In view of said circumstances, the objective of the invention is to the thermal analyzer temperature control equipment and the control method that propose a kind of power control resolution height, not influenced by the external power grid voltage fluctuation.
The thermal analyzer temperature control equipment that the present invention proposes, it comprises: micro controller module, power control module, the temperature-measuring module that links to each other with described microcontroller respectively, AC-DC Voltage stabilizing module that is connected with described power control module and interference suppress module respectively, and suppress the heater strip that module is connected with described interference; Wherein:
Described AC-DC Voltage stabilizing module is converted to constant DC with alternating current and presses, and exports this DC voltage to power control module;
Described power control module receives from the high-frequency PWM control signal, and whether the DC voltage of control AC-DC Voltage stabilizing module output outputs to disturb and suppress module, and further outputs to heater strip;
Described thermometric degree measurement module comprises thermocouple voltages measure portion and cold junction temperature measure portion, and described cold junction temperature measure portion is used for cold junction compensation.
The concrete parts of described thermal analyzer temperature control equipment comprise: constant voltage source assembly, high-power switch device and driven unit thereof, filtering unit, microprocessor controls assembly, heating furnace, temperature sensor and signal condition amplifier module, temperature sampling assembly.Described constant voltage source assembly is a high power switching power supply, is heating furnace work power supply.The constant voltage source assembly passes through to link to each other with heating furnace behind high-power switch device, the filtering unit.The microprocessor controls assembly calculates the PWM dutycycle according to temperature-controlled process, forms the high-frequency PWM modulation signal.The high-frequency PWM modulation signal drives through the high-power switch device driven unit, the break-make of control high-power switch device.Reach the effect of adjusting the useful power that is transported to heating furnace.
The control method of described thermal analyzer high-frequency PWM temperature control equipment, concrete steps comprise destination object temperature computation, the calculating of PWM dutycycle, the processing of different heating rate temperature control section zone of transition flex point; Wherein:
Described destination object temperature computation, its process comprises:
Adopt thermocouple voltages and temperature respective function relation: f in the higher order functionality match room temperature range
T2V(T);
Adopt electric thermo-couple temperature and function of voltage relation: f in the higher order functionality match thermal analyzer temperature limit
V2T(V);
The process of cold junction compensation is:
V
Cold=f
T2V(T
Cold) formula 1
V
0 ℃=V
Cold+ V
m Formula 2
T=f
V2T(V
0 ℃) formula 3
T
ColdBe cold junction temperature; Pyrometer fire-end is T
Cold, when cold junction temperature was 0 ℃, corresponding output voltage was V
ColdWith respect to the thermocouple cold junction voltage V that thermopair should be exported under 0 ℃ of condition
0 ℃, T is the destination object actual temperature;
Described PWM dutycycle is calculated, and its process comprises:
Utilize neural network dynamic to revise the PID coefficient;
Utilize the PID method to calculate the PWM dutycycle;
Described different heating rate temperature control section zone of transition flex point is handled, and its process comprises:
According to the different heating rates of two adjacent temperature control sections, calculate the coefficient of secondary or higher order functionality; Adopt secondary or the adjacent temperature control section of high order smooth connection, reduce different temperature control section flex points place overshoot phenomenon.
The thermal analyzer temperature-controlled process comprises: the disposal route at constant speed heating and cooling, constant-temperature control method and different rates temperature control section flex point place.Constant speed heating and cooling process and thermostatic process control method adopt neural network and PID to combine and control, and neural network dynamic is revised the corresponding Kp of PID, Ki, Kd parameter, optimize PID control effect.The constant speed heating and cooling process adopts linear modification pid algorithm target temperature to reach linear heating and cooling temperature control purpose.Different rates temperature control flex point place adopts higher order functionality to generate target temperature value, and different rates temperature control section rate temperature change is seamlessly transitted, and weakens the sudden change of flex point place temperature control speed greatly and brings the overshoot phenomenon that causes.
Characteristics of the present invention are: power control resolution height, and temperature control is accurate, and the overshoot of different rates temperature control section zone of transition is little.
Description of drawings
Fig. 1 is a thermal analyzer high-frequency PWM attemperating unit synoptic diagram.
Fig. 2 is a target temperature measurement module synoptic diagram.
Fig. 3 is the power control module synoptic diagram.
Fig. 4 disturbs to suppress module diagram.
Fig. 5 is thermal analyzer high-frequency PWM attemperating unit program one-piece construction figure
Fig. 6 is a system initialization process flow diagram in the thermal analyzer high-frequency PWM attemperating unit control method.
Fig. 7 is an analog to digital conversion Interrupt Process process flow diagram in the thermal analyzer high-frequency PWM attemperating unit control method.
Fig. 8 is a temperature control timing Interrupt Process process flow diagram in the thermal analyzer high-frequency PWM attemperating unit control method.
Fig. 9 is a destination object temperature computation process flow diagram.
Figure 10 is the design temperature calculation flow chart.
Figure 11 is neural network structure figure.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Consult Fig. 1, Fig. 1 shows thermal analyzer high-frequency PWM attemperating unit synoptic diagram basic structure, comprise micro controller module 1, power control module 4, the temperature-measuring module 2 that links to each other with this microcontroller 1 respectively, also comprise the AC-DC Voltage stabilizing module 3 that is connected with power control module 4 and disturb inhibition module 5, and suppress the heater strip 6 that module 5 is connected with interference.
As Fig. 2, the thermocouple voltages measure portion comprises thermopair 2.1 in the described temperature-measuring module 2, and the signal that is connected with thermopair 2.1 amplifies conditioning unit 2.2, and amplifies the thermopair AD converting unit 2.3 that conditioning unit 2.2 is connected with signal.The cold junction temperature measure portion comprises cold junction temperature sensor unit 2.4 and the cold junction AD converting unit 2.5 that is connected with the cold junction temperature sensor in the described temperature-measuring module 2.Described thermopair AD converting unit 2.3 links to each other with micro controller module 1 with cold junction AD converting unit 2.5, micro controller module 1 utilizes the data of cold junction AD converting unit 2.5 outputs that thermopair AD converting unit 2.3 output ground data are compensated, and obtains the true temperature of target control object.
As Fig. 3, described power control module 4 comprises the driver module unit 4.2 that links to each other with micro controller module 1, also comprises the high-power switch device 4.1 that links to each other with AC-DC stabilized voltage supply 3, interference inhibition module 5, driver module 4.2.The pwm signal of micro controller module 1 output is isolated through driver module 4.2 photoelectricity, after promoting driving force, control high-power switch device 4.1 conductings and end, thereby control AC-DC stabilized voltage supply 3 outputs to interference inhibition module 5 according to the peak pulse duration of the pwm signal of micro controller module 1 output, further output to heater strip 6, control outputs to the real power of heater strip 6.
As Fig. 4, described interference suppresses module 5 and comprises the schottky diode 5.1 that is connected between high-power switch device 4.1 output terminals and the ground, also comprise the choking coil 5.2 that connects between high-power switch device 4.1 output terminals and the heater strip 6, also comprise the filter capacitor 5.3 that connects between choking coil 5.2 and the ground, heater strip 6 is connected in parallel with filter capacitor 5.3.
In the present embodiment, AC-DC stabilized voltage supply 3 is a high power switching power supply, and alternating current is through AC-DC stabilized voltage supply 3 output 140V stable DC voltages.
The thermopair 2.1 that temperature-measuring module 2 comprised is E type or K type thermopair, signal amplifies conditioning unit 2.2 and adopts instrument amplifier INA128, OP97 operational amplifier to constitute, INA128 is suitable for thermopair AD converting unit 2.3 required voltages with being amplified to of thermocouple voltages, and OP97 realizes the whole and active power filtering of zero offset.The cold junction temperature sensor 2.4 that is comprised adopts temperature sensor LM35, and LM35 is in the 10mV/ ℃ of ratio output voltage corresponding with cold junction temperature.Thermopair 2.1 cold junction access points and cold junction temperature sensor 2.4 are fixed in the same copper billet, and the copper billet good heat-conducting guarantees that thermopair 2.1 cold junction temperatures and sensor 2.4 measured temperature keep highly consistance.Thermopair AD converting unit 2.3 and cold junction AD converting unit 2.5 all adopt the AD7714 analog to digital converter.
The high-power switch device 4.1 that power control module 4 is comprised adopts IGBT FGA25N120, and driver module 4.2 adopts M57962.Microcontroller 1 output is up to the high-frequency PWM signal of 15KHZ, and described pwm signal is through the inner light-coupled isolation of M57962, after the M57962 internal drive circuits promotes driving force, the conducting of control high-power switch device 4.1 with end.When control high-power switch device 4.1 conductings, electric current by AC-DC stabilized voltage supply 1, high-power switch device 4.1 after, output to heater strip 6 by disturbing the choking coil 5.2 that suppresses in the module 5.
As Fig. 5, the control program one-piece construction of thermal analyzer high-frequency PWM temperature control equipment comprises regularly break in service module 9 of main program module 7, AD conversion break in service module 8 and temperature control.Main program module 7 is finished system initialization and is detected the zone bit of setting in turn.When the AD conversion chip produces new data, call AD conversion break in service module 8, read the AD conversion value, the Data Update zone bit is set.When temperature control arrives cycle length, produce temperature control and regularly interrupt, call temperature control regularly break in service module 9 calculate the current dutycycle that needs output PWM waveform, PWM timer duty cycle register is set.
Main program module 7 flow processs such as Fig. 6 finish at first that microcontroller interface initialization 7.1, modulus conversion chip initialization 7.2, modulus conversion chip interrupt being provided with 7.3, width modulation timer initialization 7.4, temperature control timer initialization 7.5, temperature control timer interrupt being provided with 7.6.Circulation detects cold junction AD value updating mark 7.7, thermopair AD value updating mark 7.10 in turn, judges whether to need to upgrade pid parameter 7.13 then.When cold junction AD value updating mark 7.7 is a true time, carry out cold junction AD value filtering 7.8 successively, calculate cold junction temperature 7.9.When thermopair AD value updating mark 7.10 is a true time, carry out thermopair AD value filtering 7.11 successively, calculate destination object temperature 7.9, see formula 1, formula 2, formula 3.When judgement needs to upgrade pid parameter, neural network correction pid parameter 7.14 is called, and neural network correction pid parameter 7.14 calculates pid parameter Kp, Ki, Kd according to poor, the Current Temperatures rate of change of current target temperature, current design temperature and target temperature.And feed back current departure correction neural network weight coefficient.
Employing BP neural network is calculated pid parameter Kp, Ki, the Kd process is as follows:
As Figure 11, being input as of BP neural network:
The input and output of hidden layer are:
The input and output of output layer are:
Valuation functions is:
Neural network power output layer weighting coefficient correction function is:
Neural network power hidden layer weighting coefficient correction function is:
When the AD conversion produces new data, when interrupting taking place, call AD conversion break in service module 8, in AD conversion break in service module 8, realize the collection of thermocouple voltages value and cold junction temperature as Fig. 7, corresponding updating mark after finishing, is set in collection, so that main program module 7 inquiries.
After the temperature control cycle time of setting arrives, produce temperature control and regularly interrupt, call regularly break in service module 9 of temperature control.As Fig. 8, regularly break in service module 9 is according to predefined temperature curve in temperature control, and Real-time and Dynamic is calculated the destination object design temperature; According to design temperature and Current Temperatures, the utilization pid algorithm calculates the PWM waveform duty cycle; PWM timer dutycycle is set register is set, the PWM waveform of microcontroller 1 this dutycycle of output.
Calculating destination object temperature 7.9 modules that described main program module 7 is comprised compensate thermocouple cold junction, according to the actual temperature of measured thermopair output voltage values calculating target function.According to thermocouple indexing table, going out at thermocouple cold junction between-50 ℃ to 100 ℃ with the cubic function piecewise fitting is the respective function f of temperature and voltage under 0 ℃ of condition
T2V(T); Go out the function f that thermocouple cold junction between-100 ℃-1000 ℃ is voltage and vs. temperature under 0 ℃ of condition with the cubic function piecewise fitting
V2T(V).As Fig. 9, calculate that destination object temperature 7.9 modules further comprise cubic function match cold junction temperature corresponding thermocouples voltage 7.9.1, the corresponding output voltage values 7.9.2 of thermopair, three modules of cubic function match thermocouple voltages corresponding temperature value 7.9.3 when calculating with respect to 0 ℃ of cold junction.Cubic function match cold junction temperature corresponding thermocouples voltage 7.9.1 is according to function f
T2V(T) and calculate the thermocouple voltages value V that cold junction temperature that cold junction temperature 7.9 obtains calculates this cold junction temperature correspondence
Cold, see formula 1; Calculating during with respect to 0 ℃ of cold junction the corresponding output voltage values 7.9.2 of thermopair the thermopair AD value that thermopair AD value filtering 7.11 modules obtain is converted to the thermopair actual output voltage, stack V
ColdObtain correspondent voltage V under 0 ℃ of condition of thermocouple cold junction
0 ℃, see formula 2; 7.9.3 is according to f for cubic function match thermocouple voltages corresponding temperature value
n(V) and V
0 ℃Calculate the destination object actual temperature value, see formula 3.
Described temperature control is the accounting temperature setting value 9.1 that comprised of break in service module 9 regularly, further comprises to judge whether to steady temperature zone 9.1.1, judge whether to linear heating and cooling zone 9.1.2, judge whether to be flex point zone 9.1.3.When being judged as the 9.1.1 establishment of steady temperature zone, the destination object design temperature is a fixed value; When being judged as the 9.1.2 establishment of linear heating and cooling zone, according to setting temperature rate k
0, T
s=k
0* t; When being judged as the 9.1.3 establishment of flex point zone, utilize quadratic function correction flex point curve, according to flex point function modifying target object design temperature.
As to establish the last period heating rate be k
1, back one section heating rate is k
2Then can set up flex point function: T
S=kt
2
Work as k
1＜k
2The time, k get on the occasion of, otherwise k gets negative value.| k| is an empirical value, the smoothness of decision flex point.
For two temperature control sections are seamlessly transitted, secondary flex point function is identical with temperature control section intersection slope.Can get: t
1=k
1/ (2*k), t
2=k
2/ (2*k);
Therefore, after last temperature control section finishes, press T
s=kt
2(t 〉=t
1, t＜t
2) the modifying target design temperature, work as t=t
2The time, enter back one temperature control section.Guarantee that different heating rate temperature control sections seamlessly transit, and reduce overshoot.
The PID method that described temperature control timing break in service module 9 is comprised is calculated PWM dutycycle 9.2 and is traditional PI D method, but adopts neural net method correction PID COEFFICIENT K p, Ki, Kd at the neural network correction pid parameter 7.14 that main program module 7 is comprised.Comprehensive, in fact system has adopted the Neural Network PID Control method.
Above embodiment is only for the usefulness that the present invention is described, but not limiting the scope of the invention.Person skilled in the relevant technique under the situation that does not break away from the spirit and scope of the present invention, can also be made various modification and conversion, and the technical scheme that all are equal to also should belong within the category of the present invention's protection, is limited by each claim.
Claims (10)
1. thermal analyzer high-frequency PWM temperature control equipment, it is characterized in that it comprises: micro controller module, power control module, the temperature-measuring module that links to each other with described microcontroller respectively, AC-DC Voltage stabilizing module that is connected with described power control module and interference suppress module respectively, and suppress the heater strip that module is connected with described interference; Wherein:
Described AC-DC Voltage stabilizing module is converted to constant DC with alternating current and presses, and exports this DC voltage to power control module;
Described power control module receives from the high-frequency PWM control signal, and whether the DC voltage of control AC-DC Voltage stabilizing module output outputs to disturb and suppress module, and further outputs to heater strip;
Described temperature-measuring module comprises thermocouple voltages measure portion and cold junction temperature measure portion, and described cold junction temperature measure portion is used for cold junction compensation.
2. thermal analyzer high-frequency PWM temperature control equipment according to claim 1, it is characterized in that the thermocouple voltages measure portion comprises thermopair (2.1) in the described temperature-measuring module (2), the signal that is connected with thermopair (2.1) amplifies conditioning unit (2.2), and amplifies the thermopair AD converting unit (2.3) that conditioning unit (2.2) is connected with signal; The cold junction temperature measure portion comprises cold junction temperature sensor unit (2.4) and the cold junction AD converting unit (2.5) that is connected with the cold junction temperature sensor in the described temperature-measuring module (2); Described thermopair AD converting unit (2.3) links to each other with micro controller module (1) with cold junction AD converting unit (2.5), micro controller module (1) utilizes the data of cold junction AD converting unit (2.5) output that thermopair AD converting unit (2.3) output ground data are compensated, and obtains the true temperature of target control object.
3. thermal analyzer high-frequency PWM temperature control equipment according to claim 2, it is characterized in that described power control module (4) comprises the driver module unit (4.2) that links to each other with micro controller module (1), also comprise the high-power switch device (4.1) that links to each other with AC-DC stabilized voltage supply (3), interference inhibition module (5), driver module (4.2); The pwm signal of micro controller module (1) output is isolated through driver module unit (4.2) photoelectricity, after promoting driving force, control high-power switch device (4.1) conducting and end, thereby control AC-DC stabilized voltage supply (3) outputs to interference inhibition module (5) according to the peak pulse duration of the pwm signal of micro controller module (1) output, further output to heater strip (6), control outputs to the real power of heater strip (6).
4. thermal analyzer high-frequency PWM temperature control equipment according to claim 3, it is characterized in that described described interference suppresses module (5) and comprises the schottky diode (5.1) that is connected between high-power switch device (4.1) output terminal and the ground, also comprise the choking coil (5.2) that connects between high-power switch device (4.1) output terminal and the heater strip (6), also comprise the filter capacitor (5.3) that connects between choking coil (5.2) and the ground, heater strip (6) is connected in parallel with filter capacitor (5.3).
5. thermal analyzer high-frequency PWM temperature control equipment according to claim 4 is characterized in that the control program of control device comprises regularly break in service module (9) of main program module (7), AD conversion break in service module (8) and temperature control; Wherein main program module (7) is used for system initialization and detects the zone bit of setting in turn; When the AD conversion chip produces new data, call AD conversion break in service module (8), read the AD conversion value, the Data Update zone bit is set; When temperature control arrives cycle length, produce temperature control and regularly interrupt, call regularly break in service module (9) of temperature control, calculates the current dutycycle that needs to export the PWM waveform, PWM timer duty cycle register is set.
6. thermal analyzer high-frequency PWM temperature control equipment according to claim 5, it is characterized in that described main program module (7), at first finish microcontroller interface initialization, modulus conversion chip initialization, modulus conversion chip interruption setting, the initialization of width modulation timer, the initialization of temperature control timer, temperature control timer interruption setting; Circulation detects cold junction AD value updating mark, thermopair AD value updating mark in turn, judges whether to need to upgrade pid parameter then; When cold junction AD value updating mark is a true time, carry out cold junction AD value filtering successively, calculate cold junction temperature; When thermopair AD value updating mark is a true time, carry out thermopair AD value filtering (7.11) successively, calculate destination object temperature (7.9); When judgement needs to upgrade pid parameter, neural network correction pid parameter (7.14) is called, neural network correction pid parameter (7.14) calculates pid parameter Kp, Ki, Kd, and feeds back current departure correction neural network weights coefficient according to poor, the Current Temperatures rate of change of current target temperature, current design temperature and target temperature;
When the AD conversion produces new data, when interrupting taking place, call AD conversion break in service module (8), in AD conversion break in service module (8), realize the collection of thermocouple voltages value and cold junction temperature, corresponding updating mark after finishing, is set in collection, so that main program module (7) inquiry;
After the temperature control cycle time of setting arrives, produce temperature control and regularly interrupt, call regularly break in service module (9) of temperature control; Regularly break in service module (9) is according to predefined temperature curve in temperature control, and Real-time and Dynamic is calculated the destination object design temperature; According to design temperature and Current Temperatures, the utilization pid algorithm calculates the PWM waveform duty cycle; PWM timer dutycycle is set register is set, microcontroller (1) is exported the PWM waveform of this dutycycle.
7. thermal analyzer high-frequency PWM temperature control equipment according to claim 6, it is characterized in that the calculating destination object thermal module (7.9) that described main program module (7) is comprised, thermocouple cold junction is compensated, according to the actual temperature of measured thermopair output voltage values calculating target function; According to thermocouple indexing table, going out at thermocouple cold junction between-50 ℃ to 100 ℃ with the cubic function piecewise fitting is the respective function f of temperature and voltage under 0 ℃ of condition
T2V(T); Go out the function f that thermocouple cold junction between-100 ℃-1000 ℃ is voltage and vs. temperature under 0 ℃ of condition with the cubic function piecewise fitting
V2T(V); Calculate that destination object thermal module (7.9) further comprises cubic function match cold junction temperature corresponding thermocouples voltage module (7.9.1), the corresponding output voltage values module of thermopair (7.9.2), three modules of cubic function match thermocouple voltages corresponding temperature value module (7.9.3) when calculating with respect to 0 ℃ of cold junction; The computing formula of these three modules is followed successively by:
V
Cold=f
T2V(T
Cold) formula 1
V
0 ℃=V
Cold+ V
mFormula 2
T=f
V2T(V
0 ℃) formula 3
T
ColdBe cold junction temperature; Pyrometer fire-end is T
Cold, when cold junction temperature was 0 ℃, corresponding output voltage was V
ColdWith respect to the thermocouple cold junction voltage V that thermopair should be exported under 0 ℃ of condition
0 ℃, T is the destination object actual temperature.
8. thermal analyzer high-frequency PWM temperature control equipment according to claim 7, it is characterized in that the regularly accounting temperature setting value module (9.1) that comprised of break in service module (9) of described temperature control, further comprise and judge whether to steady temperature regions module (9.1.1), judge whether, judge whether to be flex point regions module (9.1.3) to linear heating and cooling regions module (9.1.2); When being judged as the establishment of steady temperature zone, the destination object design temperature is a fixed value; When being judged as the establishment of linear heating and cooling zone, according to setting temperature rate, linear modification destination object design temperature; When being judged as the establishment of flex point zone, utilize secondary or higher order functionality correction flex point curve, obtain the flex point function, according to flex point function modifying target object design temperature.
9. thermal analyzer high-frequency PWM temperature control equipment according to claim 8 is characterized in that the described quadratic function correction flex point curve that utilizes, and according to the step of flex point function modifying target object design temperature is:
If the last period, heating rate was k
1, back one section heating rate is k
2, then set up flex point function: T
S=kt
2
Work as k
1＜k
2The time, k get on the occasion of, otherwise k gets negative value, | k| is an empirical value;
For two temperature control sections are seamlessly transitted, secondary flex point function is identical with temperature control section intersection slope, that is: t
1=k
1/ (2*k), t
2=k
2/ (2*k);
After last temperature control section finishes, press T
s=kt
2(t 〉=t
1, t＜t
2) the modifying target design temperature, work as t=t
2The time, enter back one temperature control section.
10. be applied to the control method of the described thermal analyzer high-frequency PWM of one of claim 1-9 temperature control equipment, it is characterized in that: concrete steps comprise destination object temperature computation, the calculating of PWM dutycycle, the processing of different heating rate temperature control section zone of transition flex point; Wherein:
Described destination object temperature computation, its process comprises:
Adopt thermocouple voltages and temperature respective function relation: f in the higher order functionality match room temperature range
T2V(T);
Adopt electric thermo-couple temperature and function of voltage relation: f in the higher order functionality match thermal analyzer temperature limit
V2T(V);
The process of cold junction compensation is:
V
Cold=f
T2V(T
Cold) formula 1
V
0 ℃=V
Cold+ V
mFormula 2
T=f
V2T(V
0 ℃) formula 3
T
ColdBe cold junction temperature; Pyrometer fire-end is T
Cold, when cold junction temperature was 0 ℃, corresponding output voltage was V
ColdWith respect to the thermocouple cold junction voltage V that thermopair should be exported under 0 ℃ of condition
0 ℃, T is the destination object actual temperature;
Described PWM dutycycle is calculated, and its process comprises:
Utilize neural network dynamic to revise the PID coefficient;
Utilize the PID method to calculate the PWM dutycycle;
Described different heating rate temperature control section zone of transition flex point is handled, and its process comprises:
According to the different heating rates of two adjacent temperature control sections, calculate the coefficient of secondary or higher order functionality; Adopt secondary or the adjacent temperature control section of high order smooth connection, reduce different temperature control section flex points place overshoot phenomenon.
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| WO2015078346A1 (en) * | 2013-11-26 | 2015-06-04 | 李飞宇 | Heating method and device capable of suppressing harmonics and flicker |
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| CN105807812A (en) * | 2014-12-30 | 2016-07-27 | 中核控制系统工程有限公司 | PID temperature control method and temperature control module |
| CN106292785A (en) * | 2015-05-18 | 2017-01-04 | 广东兴发铝业有限公司 | Aluminum-bar heating furnace ignition temperature automaton based on neutral net |
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| CN108954483A (en) * | 2018-07-08 | 2018-12-07 | 苏州妙文信息科技有限公司 | A kind of intelligent bathroom heater temperature control method |
| CN109298735A (en) * | 2017-07-25 | 2019-02-01 | 中国科学院沈阳自动化研究所 | The feed-forward and feedback composite control method of differential scanning calorimeter constant heating rates sintering process |
| CN110015696A (en) * | 2019-04-29 | 2019-07-16 | 电子科技大学 | Control the method for reaction temperature change rate and the application in synthesizing magnetic nanoparticle |
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| CN111438905A (en) * | 2020-02-27 | 2020-07-24 | 宁波创元信息科技有限公司 | Temperature control system and method for injection mold |
| CN111474205A (en) * | 2020-05-08 | 2020-07-31 | 杭州盘古自动化系统有限公司 | System and method for detecting heat flow and temperature sensor for thermal analysis |
| TWI711907B (en) * | 2018-07-27 | 2020-12-01 | 日商阿自倍爾股份有限公司 | Regulator |
| CN115921801A (en) * | 2023-03-14 | 2023-04-07 | 中铝材料应用研究院有限公司 | Method for modifying eutectic structure of large-size 4000-series aluminum alloy cast ingot |
| CN117215394A (en) * | 2023-11-07 | 2023-12-12 | 北京数渡信息科技有限公司 | On-chip temperature and energy consumption control device for multi-core processor |
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| CN110015696A (en) * | 2019-04-29 | 2019-07-16 | 电子科技大学 | Control the method for reaction temperature change rate and the application in synthesizing magnetic nanoparticle |
| CN110015696B (en) * | 2019-04-29 | 2021-12-03 | 电子科技大学 | Method for controlling reaction temperature change rate and application of method in synthesis of magnetic nanoparticles |
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| CN111438905A (en) * | 2020-02-27 | 2020-07-24 | 宁波创元信息科技有限公司 | Temperature control system and method for injection mold |
| CN111474205A (en) * | 2020-05-08 | 2020-07-31 | 杭州盘古自动化系统有限公司 | System and method for detecting heat flow and temperature sensor for thermal analysis |
| CN115921801A (en) * | 2023-03-14 | 2023-04-07 | 中铝材料应用研究院有限公司 | Method for modifying eutectic structure of large-size 4000-series aluminum alloy cast ingot |
| CN115921801B (en) * | 2023-03-14 | 2023-10-10 | 中铝材料应用研究院有限公司 | Method for modifying eutectic structure of large-size 4000-series aluminum alloy cast ingot |
| CN117215394A (en) * | 2023-11-07 | 2023-12-12 | 北京数渡信息科技有限公司 | On-chip temperature and energy consumption control device for multi-core processor |
| CN117215394B (en) * | 2023-11-07 | 2024-01-23 | 北京数渡信息科技有限公司 | On-chip temperature and energy consumption control device for multi-core processor |
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