CN102495650A - Multi-stage refined precise temperature control device and control method - Google Patents
Multi-stage refined precise temperature control device and control method Download PDFInfo
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- CN102495650A CN102495650A CN2011104242580A CN201110424258A CN102495650A CN 102495650 A CN102495650 A CN 102495650A CN 2011104242580 A CN2011104242580 A CN 2011104242580A CN 201110424258 A CN201110424258 A CN 201110424258A CN 102495650 A CN102495650 A CN 102495650A
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Abstract
The invention discloses a multi-stage refined precise temperature control device. The device comprises a microprocessor module, as well as a temperature collection module and a heating control module which are respectively connected with the microprocessor module, wherein the heating control module comprises two stages or more than two stages of power control units; each stage of power control unit is connected with heaters with different powers respectively; and the maximum power of the next stage of power control unit is equal to the minimum controllable power granularity of the previous stage of power control unit. The invention further discloses a control method, rounding and remainder power distribution method is adopted to distribute power requiring to be output in the next temperature control period, which is solved by adopting the temperature control algorithm, into all stages of the power control units. The plurality of power control modules are adopted to refine the controllable power granularity, improve the accuracy in temperature control, and reduce temperature fluctuation.
Description
Technical field
The invention belongs to domain of control temperature, relate to a kind of temperature device and control method, relate in particular to the precision temperature control device and the control method that need precision temperature control in the instrument and equipments such as thermal analyzer, thermostatic bath, temperature correction appearance.
Background technology
Temperature control technology not only is widely used in industrial agricultural production, in many precision measuring instrument instruments and meters, also is used widely.Thermal-analysis instrumentation is used to measure the relation of material behavior and temperature, like thermogravimetric analyzer through linear heating and cooling of programmed control and constant temperature, with the quality of investigating material with the temperature variation relation of (or time); Differential scanning calorimeter and differential thermal analyzer change relevant temperature, the relation of hot-fluid through linear heating and cooling of programmed control and constant temperature to investigate the material internal heat; Thermomechanical analyzer is controlled linear heating and cooling and constant temperature through programmed control, to investigate the relation of material deformation and temperature; When capillary viscosimeter was measured viscosity, because of viscosity and temperature dependency are big, needing high-precision calibration cell be capillary viscosimeter structure isoperibol; The temperature correction appearance needs a high-precision temperature environment that other temperature sensor or temperature measuring instrument are demarcated equally.In the precision instrumentation of numerous and temperature correlation, the precision temperature control device is to guarantee that it obtains the essential condition of accurate measurement result.
Above-mentioned fine measuring instrument need strengthen heater element power on the one hand, reduce the heating target thermal capacitance, so that reduce Measuring Time, needs the precise dose environment to guarantee to obtain measurement result accurately on the other hand.If but the controlled power granularity is excessive, be difficult to realize precise dose control, temperature fluctuation range is bigger.In the temperature control system, Poewr control method commonly used has any phase angle SCR control, zero-based control, PWM control etc. at present.The phase angle SCR control is through adjustment conduction angle adjustment output power arbitrarily; The calculating of conduction angle need be adopted trigonometric function; Calculated amount is big; And because the time-delay great errors of zero-detection circuit, and the conducting of switching device is not the zero point of alternating current voltage, and is bigger with the interference of surveying instrument inside to electrical network; The PWM mode can realize accurate power controls, but owing to adopt chopping way, for high-power heater element, frequent big electric current, high-voltage switch disturb more serious to surveying instrument inside small-signal metering circuit, the accuracy that influence is measured; Realize the conducting of high-power switch device and end the zero point that zero-based is controlled at alternating current, very little to electrical network and surveying instrument internal interference, but whether be applied to heater element owing to can only control half complete ac power waveform; If control cycle is less; Then cause the controlled power granularity excessive, the power of output is not too big, is exactly too little; Cause temperature fluctuation big, be difficult to realize precise dose control; If control cycle is bigger, the temperature control system response is untimely, causes serious low-frequency disturbance.
Summary of the invention
In view of above situation, it is little that the object of the invention is to propose a kind of controlled power granularity, to electrical network and little multistage refinement precision temperature control device and the control method of surveying instrument internal interference.Adopt multistage power control unit that zero-based power control granularity is carried out refinement, satisfy the little and little requirement of controlled power granularity simultaneously electrical network and surveying instrument internal interference.
Multistage refinement precision temperature control device proposed by the invention, it comprises microprocessor module 1, temperature collect module 2 and heating control module 3, temperature collect module 2 links to each other with said microprocessor module 1 respectively with heating control module 3; The invention allows for the power distribution method of realizing multistage power control in a kind of multistage refinement precision temperature control device.
Said temperature collect module 2 comprises temperature sensor 2.1, electric bridge 2.2, amplifying circuit 2.3, filtering circuit 2.4, analog to digital conversion circuit 2.5, also comprises voltage reference source circuit 2.6 and bridge drive circuit 2.7.Temperature sensor 2.1 links to each other with bridge diagram 2.2, is a brachium pontis of bridge diagram 2.2; The electric bridge that temperature sensor 2.1 is formed is an electric signal with the controlled device temperature inversion; Amplifying circuit links to each other with electric bridge 2.2, and the signal that electric bridge 2.2 is exported is amplified to the needed voltage range of analog to digital conversion circuit; Amplifying circuit 2.2 also links to each other with filtering circuit 2.4 simultaneously, and filtering circuit 2.4 carries out LPF, avoids causing that the analog to digital conversion circuit aliasing disturbs; Filtering circuit 2.4 links to each other with analog to digital conversion circuit 2.5, is digital signal with filtered conversion of signals; Reference voltage source circuit 2.6 links to each other with analog to digital conversion circuit 2.5, and for analog to digital conversion circuit provides voltage reference, voltage reference source circuit also links to each other with bridge drive circuit 2.7 simultaneously, forms stable voltage and is loaded into electric bridge.
Said heating control module 3 comprises two-stage or the above power control unit of two-stage, and every grade of power control unit comprises driving circuit 3.1, mistake zero state solid-state relay (or crossing zero state controllable silicon) switching device 3.2, heater members 3.5; Switching device 3.2 connects alternating currents, link to each other with heater members 3.5 simultaneously, the conducting of switching device 3.2 with whether be loaded into heater members 3.5 by controlling alternating current; Driving circuit 3.1 links to each other with microprocessor module 1, switching device 3.2 simultaneously, the conducting of the control signal of microprocessor module 1 output through driving circuit 3.1 back CS devices 3.2 with end.
The peak power of every grade of power control unit has nothing in common with each other, and next stage power control unit peak power approximates upper level power control unit controlled power granularity, and multistage power control unit is controlled by microprocessor separately, refinement controlled power granularity.
Power control units at different levels link to each other with 1 one control of microprocessor module output pin respectively, and microprocessor can independently be controlled every grade of power control unit, and control outputs to the thermal value of power control unit heater members at different levels.
Said multistage refinement precision temperature control device control method realizes the power division that multistage power is controlled, and adopts to round the complementation power distribution method; Rounding complementation power distribution method step is:
1) the output power P in next temperature control cycle of solving of temperature control algorithm;
2) P is divided exactly the controlled power granularity of first order power control unit, and dividing exactly the result is to distribute to the output power P1 of first order power control unit, and P is to the controlled power granularity complementation P1_remain of first order power control unit;
3) P1_remain is divided exactly the controlled power granularity of second level power control unit, and the result who divides exactly is the output power P2 of second level power control unit, and P2 is to the controlled power granularity complementation P2_remain of second level power control unit;
4) and the like, calculate next temperature control cycle output power Pn of power control units at different levels.
By on can know that multistage refinement precision temperature control device according to the invention and control method adopt the thermal value of zero-based power control circuit control heater spare, reached and reduced power control circuit the purpose of electrical network with the fine measuring instrument interference; Simultaneously, zero-based Poewr control method controlled power granularity is carried out refinement, solved the big problem of zero-based power control controlled power granularity, prerequisite is provided for realizing the little precision temperature control of temperature fluctuation through multistage power control unit.
Description of drawings
Fig. 1 is multistage refinement precision temperature control device one-piece construction synoptic diagram.
Fig. 2 is the temperature collect module synoptic diagram.
Fig. 3 is power control unit synoptic diagram at different levels.
Fig. 4 is embodiment 1 microcontroller circuit.
Fig. 5 is that embodiment 1 temperature is amplified and Acquisition Circuit.
Fig. 6 is embodiment 1 reference voltage source and bridge drive circuit.
Fig. 7 is embodiment 1 a heating control module circuit.
Fig. 8 is embodiment 1 a control method process flow diagram.
Embodiment
Further explain below in conjunction with accompanying drawing and 1 couple of the present invention of embodiment.
It is as shown in Figure 4 that 1 of embodiment comprises microprocessor module, and microprocessor U1 adopts the arm processor STM32F103C8T6 of CORTEX-M3 kernel.Y1, C6 and C7 constitute the microprocessor clock peripheral circuit, link to each other with 5,6 pin of STM32F103C8T6.R1, C8 are electrify restoration circuit, link to each other with 7 pin of STM32F103C8T6; 3.3V power supply after C1, C2, C3, C4 decouple filtering, is connected to the digital power pin 48,36,24 of U1; After inductance L 1, C5 filtering, be connected to STM32F103C8T6 analog power pin 9; The certain clock signal of 13 pin (FS0) output of STM32F103C8T6, control temperature collect module analog to digital conversion internal low pass filter break frequency; 14 pin connect temperature collect module modulus conversion chip sheet and select pin, are used for choosing modulus conversion chip; 15,16,17 pins of STM32F103C8T6 are corresponding SPI interface SCK, MISO, MOSI signal respectively, also is connected to the modulus conversion chip of temperature collect module, and modulus conversion chip is read and write; 26,27 pins of STM32F103C8T6 are connected to heating control module, control two power control units respectively.
As shown in Figure 5, embodiment 1 temperature collect module comprises bridge diagram, amplifying circuit, filtering circuit and the analog to digital conversion circuit of band temperature sensor TS.RTD has best linearity and accuracy at-50 ℃～400 ℃, and temperature sensor TS adopts the PT100 platinum resistance temperature sensor; R2, R3, R5 and temperature sensor TS form electric bridge, and TS adopts three-wire system to connect method, weaken to connect the influence that conductor resistance brings; The signal of electric bridge output is input to low noise instrument amplifier AD8429 after C14, C15 filtering; The enlargement factor of AD8429 is by R6 decision (G=1+6K/R6); According to temperature-measuring range and electric bridge parameter, appropriately select R6, the signal voltage range that makes output is between 0-3V; U3 forms the active second-order low-pass filter of positive feedback type with Resistor-Capacitor Unit on every side, according to the fertile husband's Design of Filter of Bart, cutoff frequency 5HZ; The signal of U3 output is connected to analog to digital conversion circuit, and modulus conversion chip U4 adopts Linear modulus conversion chip LTC2400, and its 24 bit resolution, the good linearity, extremely low temperature coefficient provide sound assurance for obtaining high-precision temperature.
As shown in Figure 6, embodiment 1 temperature collect module also comprises voltage reference source circuit and bridge drive circuit.Voltage reference source chip U5 adopts the LTC6655 reference voltage source, and+12V power supply is input to U5 after R10, C21 decouple, 6, the 7 pin output noise is low, temperature drift is little, accuracy the is high 3.0V reference voltages of U5; This 3.0V reference voltage directly outputs to modulus conversion chip U4 2 pin Ref input ends; Reference voltage as modulus conversion chip; This 3.0V reference voltage bridge drive circuit of also outputing to U6 and being formed simultaneously; U6 is a voltage follower, and U6 output and the same stable 3.0V voltage of LTC6655 output reference voltage drive bridge diagram.
Heating control module comprises multistage power control unit, and heating control module comprises the two stage power control module among the embodiment 1, and every grade of power control unit comprises high-power switching circuit and high-power switch device driving circuit.As shown in Figure 7, M1, Q1, R12, R13, R14 constitute the one-level power control unit, and M2, Q2, R11, R15, R16 constitute the secondary power control module, and M1, M2 are zero-cross ssr; Q1, R12, R13, R14 are the driving circuits of M1, when the P_Con1 signal of microprocessor module output is high level, and the Q1 conducting; + 5V power supply constitutes the loop through R12, Q1, the inner optocoupler of M1, drives the inner optocoupler of M1 solid-state relay input end, when arrive the zero point of alternating current; Output terminal is connected, and the 220V alternating current is applied to the HEART1 heater strip, and in like manner Q2, R11, R15, R16 are the driving circuits of M2; When the P_Con2 signal of microprocessor module output is high level, the Q1 conducting ,+5V power supply constitutes the loop through R11, Q2, the inner optocoupler of M2; Drive the inner optocoupler of M2 solid-state relay input end; When arrived the zero point of alternating current, output terminal was connected, and the 220V alternating current is applied to the HEART2 heater strip.
In embodiment 1; Whether switch causes the influence to electrical network and fine measuring instrument under high voltage, the current state, adopts zero-cross ssr, can only control a complete alternation and be applied on the heater strip; Under certain temperature control cycle; The controlled power granularity is bigger, adopts two stage power control among the embodiment 1, refinement power control granularity.The resistance of the heater strip HEART1 that is connected like one-level power control unit among the embodiment 1 is 20 ohm; When alternating current voltage was 220V, the about 2400W of peak power, 50HZ alternating current comprised 100 half-waves; When the temperature control cycle is 1 second; Then power control granularity is 2400W/100=24W, and so big power control granularity is difficult to the requirement of satisfied temperature fluctuation less than 0.01 degree, adopts second level power control unit that first order power control unit is replenished among the embodiment 1.Second level power control unit heater strip HEART2 resistance is 2000 ohm, and the about 24W of peak power is same, has comprised 100 half-waves in 1 second temperature control cycle, and then the power of second level power control unit control granularity is 0.24W.Among the embodiment 1, with respect to traditional temperature control mode, through increasing the one-level power control unit, refinement power control granularity is to 0.24W, for precision temperature control provides condition.
The control method that the multistage refinement precision temperature of embodiment 1 thermostatic bath control device is adopted is for rounding complementation power division method.When a temperature control cycle arrived, algorithm flow was as shown in Figure 8:
1) obtains thermostatic bath current actual temperature value;
2) calculate the current goal temperature value;
3) calculate the heating power P that next temperature control cycle need export according to self-adaptive PID temperature algorithm (or other temperature temperature control algorithms);
4) P rounds the merchant divided by first order power control control granularity, obtains the alternating current half-wave number of first order power control unit conducting; P obtains P1_Remain to the complementation of first order power control unit;
5) P1_Remain rounds the merchant divided by second level power control unit power control granularity, obtains the alternating current half-wave number of second level power control unit conducting;
6) according to 4), 5) the result control the time that P_Con1, P_Con2 export corresponding high level.
In sum; Embodiment 1 is to traditional single stage zero-based temperature control equipment, and power control granularity is excessive, causes the big problem of temperature control fluctuation; Through increasing second level power control unit refinement power control granularity; The control of realization high-precision temperature has been developed the zero-based device for power switching electrical network and equipment itself has been disturbed little advantage, has overcome the big shortcoming of traditional single stage zero-based power power controlling control granularity simultaneously.
Above embodiment only supplies to explain the present invention's usefulness, and is not the restriction to protection domain of the present invention.The technician in relevant technologies field under the situation of spirit that does not break away from the present invention and scope, can also make 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 each claim.
Claims (6)
1. a multistage refinement precision temperature control device comprises microprocessor module, temperature collect module that links to each other with processor respectively and heating control module; It is characterized in that: heating control module comprises two-stage or the above power control unit of two-stage, and every grade of power control unit connects the heater members of different capacity.
2. according to the said multistage refinement precision temperature control device of claim 1; It is characterized in that: the power control units at different levels that said heating control module comprised link to each other with output pin of microprocessor module respectively, and microprocessor can independently be controlled every grade of power control unit.
3. according to the said multistage refinement precision temperature control device of claim 1; It is characterized in that: the heater members heating power that said every grade of power control unit connected has nothing in common with each other, and the peak power of next stage power control unit equals upper level power control unit minimum controllable power granularity.
4. according to the said multistage refinement precision temperature control device of claim 1, it is characterized in that: said power control unit comprises driving circuit, device for power switching, heater members; Device for power switching is the zero-based switching device, connects alternating current, links to each other with heater members simultaneously; The conducting of device for power switching with by control alternating current whether be loaded into heater members.
5. control method; According to controlled device Current Temperatures, target temperature; Find the solution the heating power that next temperature control cycle need export through temperature control algorithm; It is characterized in that: said control method comprises and rounds the complementation power distribution method, and the heating power of next temperature control cycle output that temperature control algorithm is found the solution is assigned to power control units at different levels.
6. according to the said control method of claim 5, it is characterized in that: said control method comprised rounds the complementation power distribution method, and calculation procedure is:
1) the output power P in next temperature control cycle of solving of temperature control algorithm;
2) P is divided exactly the controlled power granularity of first order power control unit, and dividing exactly the result is to distribute to the output power P1 of first order power control unit, and P is to the controlled power granularity complementation P1_remain of first order power control unit;
3) P1_remain is divided exactly the controlled power granularity of second level power control unit, and the result who divides exactly is the output power P2 of second level power control unit, and P2 is to the controlled power granularity complementation P2_remain of second level power control unit;
4) and the like, calculate next temperature control cycle output power Pn of power control units at different levels.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103049014A (en) * | 2012-12-06 | 2013-04-17 | 段争光 | High-temperature circulator |
| CN103345282A (en) * | 2013-06-19 | 2013-10-09 | 杭州电子科技大学 | Intermediate frequency furnace intelligent temperature control system based on STM32 |
| CN103677003A (en) * | 2013-12-17 | 2014-03-26 | 江苏大学 | PWM power adjustment system and method with optimized output phase |
| CN104423402A (en) * | 2013-08-23 | 2015-03-18 | 李飞宇 | PWM signal-based alternating current heating control method and application |
| CN105223987A (en) * | 2015-10-12 | 2016-01-06 | 珠海格力电器股份有限公司 | A kind of control method of electric heater and system |
| CN107305089A (en) * | 2016-04-22 | 2017-10-31 | Lg 电子株式会社 | For the equipment for the temperature for sensing refrigerator |
| CN107943158A (en) * | 2017-12-11 | 2018-04-20 | 合肥维博自动化科技有限公司 | A kind of automatic adjusument power output heating intelligent control card and its control method |
| CN108966371A (en) * | 2018-06-29 | 2018-12-07 | 深圳和而泰小家电智能科技有限公司 | A kind of heating device and its method for heating and controlling |
| CN109270972A (en) * | 2018-10-11 | 2019-01-25 | 中国船舶重工集团公司第七〇九研究所 | A kind of thermostatically-controlled equipment |
| CN109597446A (en) * | 2019-01-07 | 2019-04-09 | 中氢新能技术有限公司 | A kind of high temperature methanol hydrogen manufacturing temperature control constant temperature method |
| CN110426139A (en) * | 2019-08-09 | 2019-11-08 | 杭州磊鑫精密仪器有限公司 | A kind of thermometric management system and management method based on mobile terminal |
| CN111781972A (en) * | 2020-06-24 | 2020-10-16 | 惠州拓邦电气技术有限公司 | Foot basin, and temperature control method and device of foot basin |
| CN112383976A (en) * | 2020-11-27 | 2021-02-19 | 之江实验室 | High-frequency thermostat for heating alkali metal atom air chamber |
| CN113554014A (en) * | 2021-09-22 | 2021-10-26 | 江苏凯帝商业设施有限公司 | Bathtub hot water temperature control method and system based on artificial intelligence |
| CN115185317A (en) * | 2022-09-09 | 2022-10-14 | 之江实验室 | Load-adaptive wide-load intelligent high-precision temperature control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103049014A (en) * | 2012-12-06 | 2013-04-17 | 段争光 | High-temperature circulator |
| CN103345282A (en) * | 2013-06-19 | 2013-10-09 | 杭州电子科技大学 | Intermediate frequency furnace intelligent temperature control system based on STM32 |
| CN103345282B (en) * | 2013-06-19 | 2015-05-27 | 杭州电子科技大学 | Intermediate frequency furnace intelligent temperature control system based on STM32 |
| CN104423402A (en) * | 2013-08-23 | 2015-03-18 | 李飞宇 | PWM signal-based alternating current heating control method and application |
| CN103677003B (en) * | 2013-12-17 | 2016-08-17 | 江苏大学 | A kind of PWM power-regulating system exporting phase optimization and method |
| CN103677003A (en) * | 2013-12-17 | 2014-03-26 | 江苏大学 | PWM power adjustment system and method with optimized output phase |
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| CN107305089A (en) * | 2016-04-22 | 2017-10-31 | Lg 电子株式会社 | For the equipment for the temperature for sensing refrigerator |
| CN107943158A (en) * | 2017-12-11 | 2018-04-20 | 合肥维博自动化科技有限公司 | A kind of automatic adjusument power output heating intelligent control card and its control method |
| CN108966371A (en) * | 2018-06-29 | 2018-12-07 | 深圳和而泰小家电智能科技有限公司 | A kind of heating device and its method for heating and controlling |
| CN109270972A (en) * | 2018-10-11 | 2019-01-25 | 中国船舶重工集团公司第七〇九研究所 | A kind of thermostatically-controlled equipment |
| CN109597446A (en) * | 2019-01-07 | 2019-04-09 | 中氢新能技术有限公司 | A kind of high temperature methanol hydrogen manufacturing temperature control constant temperature method |
| CN110426139A (en) * | 2019-08-09 | 2019-11-08 | 杭州磊鑫精密仪器有限公司 | A kind of thermometric management system and management method based on mobile terminal |
| CN111781972A (en) * | 2020-06-24 | 2020-10-16 | 惠州拓邦电气技术有限公司 | Foot basin, and temperature control method and device of foot basin |
| CN112383976A (en) * | 2020-11-27 | 2021-02-19 | 之江实验室 | High-frequency thermostat for heating alkali metal atom air chamber |
| CN113554014A (en) * | 2021-09-22 | 2021-10-26 | 江苏凯帝商业设施有限公司 | Bathtub hot water temperature control method and system based on artificial intelligence |
| CN113554014B (en) * | 2021-09-22 | 2021-11-26 | 江苏凯帝商业设施有限公司 | Bathtub hot water temperature control method and system based on artificial intelligence |
| CN115185317A (en) * | 2022-09-09 | 2022-10-14 | 之江实验室 | Load-adaptive wide-load intelligent high-precision temperature control device |
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Application publication date: 20120613 |