CN102721243A - Single chip computer-based multi-TEC (Thermoelectric Cooler) temperature-regulated control system - Google Patents
Single chip computer-based multi-TEC (Thermoelectric Cooler) temperature-regulated control system Download PDFInfo
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Abstract
The invention relates to a single chip computer-based multi-TEC (Thermoelectric Cooler) temperature-regulated control system. The system comprises a single chip computer, a driving module and a temperature measurement module, wherein the single chip computer is used for receiving an external temperature control command, calculating the collected temperature measurement data to obtain temperature control targets and controlling the digital voltage quantity, the driving module is used for conducting temperature regulation control to a temperature control object, and the temperature measurement module is used for measuring temperature of the controlled object; and the temperature measurement module is connected with the driving module. The invention provides a single chip computer-based multi-TEC temperature-regulated control system which has the advantages of being flexible to control, strong in reliability, high in precision, fast in speed and the like.
Description
Technical field
The present invention relates to the bidirectional temp regulation control system of a kind of TEC, relate in particular to a kind of SCM Based many TEC control system for regulating temperature.
Background technology
TEC (Thermoelectric Coolers) TEC ' S also claim semiconductor cooler, is that a kind of novel band heats the device with refrigerating function, often is applied to the occasion of space finite sum high reliability.The function of TEC realizes depending on the direction of supply current, changes the sense of current, then heats and chill surface counter-rotating, the size of regulating the magnitude of current, the i.e. output of scalable refrigerating capacity.During the TEC real work, hot-side temperature is by environment temperature and the decision of hot-side heat dissipation amount, and refrigerating capacity is by refrigeration duty and cryogenic temperature decision.When hot-side temperature and refrigerating capacity one timing, operating voltage is corresponding with cold junction voltage.The operating voltage of adjustment galvanic couple can make TEC under different hot-side temperatures, keep cold junction temperature constant.TEC has simple in structure, no wearing and tearing, good reliability, life-span are long, it is fast to start, control flexibly, the characteristics that precision is high.
Development along with modern space technology; The a lot of Space Facilities of space industry need temperature control system, and common passive thermal control is not enough to satisfy local parts optimum Working directly has influence on the acquisition data to the operating temperature of the photodetectors such as requirement, particularly CCD of temperature precision; Detector is along with variation of temperature; Read noise and have variation in various degree, seek out high-quality view data, to detector stable temperature working environment being provided is one of necessary means.Therefore, high-precision temperature control system seems very important especially.
In real system, the residing environment more complicated of detector comprises the installing component that links to each other with detector; The heating situation of environment temperature, detector self etc. all is to cause the detector operating temperature can not constant factor at best operating point, and monolithic TEC refrigerating capacity and refrigeration area are limited, often are difficult to the constant required precision of satisfied temperature; Influenced the performance of detector optimum performance; In addition, at some in particular cases, also need carry out reverse temperature control to controlled thing; Carry out the stage like certain and heat, realize certain control target with expectation.
Summary of the invention
In order to solve the above-mentioned technical problem that exists in the background technology, the invention provides a kind of have control flexibly, SCM Based many TEC control system for regulating temperature of advantage such as good reliability, precision height and speed is fast.
Technical solution of the present invention is: the invention provides a kind of SCM Based many TEC control system for regulating temperature; Its special character is: said SCM Based many TEC control system for regulating temperature comprises the external command that is used to receive temperature control, and with the temperature measurement data that collects calculate the control voltage digital amount of each temperature control target single-chip microcomputer, be used for the temperature control object is carried out the driver module of temperature adjustment control and the temperature measurement module that is used for controlled device is carried out thermometric; Said temperature measurement module is associated with driver module through single-chip microcomputer.
Above-mentioned driver module comprises D/A converter, first operational amplifier, PMW generator and drive circuit; Said D/A converter inserts the PMW generator through first operational amplifier; Said PMW generator inserts drive circuit; Said single-chip microcomputer inserts D/A converter.
Above-mentioned drive circuit is unidirectional drive circuit or drive circuit in bi-directional.
Above-mentioned D/A converter is 12 D/A converters of AD664.
Above-mentioned temperature measurement module comprises constant-current source, temperature sensor, second operational amplifier, analog selection switch and A/D converter; Said constant-current source, temperature sensor, second operational amplifier, analog selection switch and A/D converter connect successively; Said A/D converter inserts single-chip microcomputer.
The said temperature sensor is a thermistor, and said thermistor is one or more.
Above-mentioned A/D converter is 12 A/D converters of AD674.
Above-mentioned SCM Based many TEC control system for regulating temperature also comprises the communication module that is used to receive control instruction and returns the temperature value that collects; Said communication module is connected with single-chip microcomputer.
The model of above-mentioned single-chip microcomputer is 80C32.
Advantage of the present invention is:
1, control flexibly.SCM Based many TEC control system for regulating temperature provided by the present invention is to all in addition temperature control of controlled device itself and adjacent ambient thereof, carries out unidirectional temperature controlledly simultaneously controlled device being carried out temperature control at close position.In addition, some special detectors need regularly be heated to the elimination that uniform temperature is carried out thermal imagery unit after working long hours, and therefore, it also is one of necessary function that such detector is carried out bidirectional temperature control.The present invention carries out temperature control to controlled device when controlling metastable adjacent ambient temperature again under the situation that main operating mode promptly need be freezed.In particular cases, when needs heat, separately controlled device is heated control; In order to address this problem, the employing bridge circuit that the present invention is also special and a plurality of but single group MOSFET pipe constitute the combination current control module, and single-chip microcomputer calculates back output 12 position digital signals convert the multiple spot controlled device to through D/A analog control voltage value to multi-point temperature measurement value and the temperature objectives value PID that collects; The magnitude of voltage that needs bidirectional temperature control produces four tunnel pwm signals that can modulate through PWM generator; Be input to four inputs of the H bridge circuit of forming by discrete device respectively, realize control, reach purpose two-way, temperature adjustment controlled device size of current and direction; Need unidirectional temperature controlled; Produce the pwm signal that multichannel can be modulated through PWM generator, be input to the control module that a plurality of single group MOSFET pipe structures are formed, realize the temperature control of close position; For limited, need high-precision temperature control occasion that reliable temperature guarantee is provided in the space.Possess controlled device is carried out bidirectional temperature control, and auxiliary function with unidirectional temperature control, its control mode is versatile and flexible.
2, good reliability.SCM Based many TEC control system for regulating temperature provided by the present invention can be controlled a plurality of TEC simultaneously, has guaranteed the stability of temperature.The present invention carries out comprehensive consideration to cool and heat ends temperature and operating voltage, makes refrigerator be issued to best refrigeration in the situation of minimum power consumption, can monitor in real time, volume is little, and control is reliable, and precision is high.
Description of drawings
Fig. 1 is the framework sketch map of system provided by the present invention;
Fig. 2 is the preferred construction sketch map of system provided by the present invention.
The specific embodiment
Referring to Fig. 1, SCM Based many TEC bidirectional temperature control of the present invention system is by single-chip microcomputer 1; Temperature measurement module 2, driver module 3, communication module 4, four parts are formed; These four modules are integrated on the circuit board; Temperature measurement module 2 inserts driver module 3 through single-chip microcomputer 1, and communication module 4 links to each other with single-chip microcomputer 1, and each intermodule connects through line on the plate of PCB.
Single-chip microcomputer 1 is to be the control core with 80C32, is used to receive the external command of temperature control on the one hand, on the one hand the data of the thermometric that collects is calculated, and draws the digital quantity of the control voltage of each temperature control target.Export the temperature display digit amount of temperature control target and current controlled device simultaneously through communication interface.
Driver module 3 comprises D/A converter 31, adopts AD664 as 12 D/A conversion chips, first operational amplifier, and PWM generator 32 and drive circuit 33, D/A converter 31, first operational amplifier, PWM generator 32 and drive circuit 33 connect successively; Drive circuit 33 is unidirectional drive circuit and bi-directional drive combinational circuit.
D/A converter adopts AD664, and 12 D/A converter spares are used for converting the digital voltage value that single-chip microcomputer calculates to magnitude of voltage.Magnitude of voltage after the conversion is delivered to PWM generator 32 through filtering, amplification, and PWM generator 32 is exported the pwm pulse after the modulation respectively according to magnitude of voltage.
For unidirectional drive circuit; Unidirectional drive circuit can be the various unidirectional drive of using always; The present invention is a core devices by many groups operational amplifier and MOSFET pipe 2N7224, and the control of the pwm pulse through different duty realizes a plurality of temperature control objects are proposed the unidirectional temperature adjustment control of control.
For drive circuit in bi-directional, classical H bridge circuit just, it is a core devices by 4 MOSFET pipes, the control through to the pwm pulse of 4 tunnel different duty realizes two-way to the temperature of master control object and control temperature adjustment.
Constant-current source 22 is managed by operational amplifier OP470 and MOSFETIRF540N and is realized forming, for thermistor provides constant electric current.
Behind the input of the plurality of voltages value behind second operational amplifier analog selection switch 23, single-chip microcomputer 1 is selected signal to outlet, by the voltage of selecting output to gather.
A/D converter 21 adopts AD674 as 12 A/D conversion chips, the magnitude of voltage of analog selection switch 23 outputs is carried out 12 A/D conversion.
External interface has three, and communication module 4 receives the control instruction of external computer, whether temperature control of enclosed mass, temperature control parameter, the temperature value that output simultaneously measures.The temperature transition that temperature measurement module 2 receives external temperature sensor becomes the measured value of voltage, is provided for the constant-current source of temperature transition simultaneously.3 pairs of control of driver module object output control voltage is realized temperature control.Utilize above-mentioned temperature control system, the temperature of can read back in real time controlled object and adjacent ambient, and can regulating and control to the temperature control target temperature, thus realized a kind of high-precision, the many TEC temperature control system that can monitor.
The control principle of system provided by the present invention is: the variations in temperature of the temperature of temperature control target and contiguous temperature control target changes into changes in resistance through a plurality of thermistor (temperature) sensors; The electric current that provides through constant-current source further changes into changes in resistance the variation of voltage; Through filtering, denoising and high-precision amplification; The multi-channel analog selector switch is selected, and carries out 12 A/D conversion one by one, reads in single-chip microcomputer.Single-chip microcomputer adopts the control algolithm of PID according to each point amount temperature and target temperature, exports 12 digital control amount respectively, through the D/A conversion, controlled quentity controlled variable is changed into analog voltage.Adopt unidirectional temperature control method for the contiguous temperature of controlled object, the D/A changing voltage value of correspondence behind operational amplifier, through PWM generator, through the dutycycle of modulation (PWM), is delivered to the MOSFET pipe with pwm signal, realize unidirectional temperature control TEC.In native system, carry out multiple spot TEC control through above method controlled device adjacent ambient, the environment temperature of controlled object is adjusted to target temperature.And controlled object passes through the signal after PWM modulates, and gets through the brachium pontis of a direction of H bridge circuit, realizes the temperature control of a direction of controlled object.In addition, controlled object not only needs unidirectional refrigeration control under some special operation condition, also need add thermal control; Because bidirectional temperature control design is the H bridge circuit, PID calculates the back single-chip microcomputer and exports 12 position digital signals and convert the analog control voltage value of controlled device to through D/A, produces four tunnel pwm signals that can modulate through PWM generator; Be input to four inputs of the H bridge circuit of forming by discrete device respectively; Get through the brachium pontis of another direction of H bridge circuit, turn-off the brachium pontis of refrigeration direction, changed sense of current; Realization reaches purpose two-way, temperature adjustment to the control of controlled device size of current and direction.
As shown in Figure 2, when system started working, at first single-chip microcomputer 1 read in the temperature control system duty according to communication instruction, like the needs temperature control, then get into the temperature control state, otherwise temperature control stopped wait command.
When system gets into the temperature control state, judge temperature control mode: manual intervention mode or automatic regulative mode according to communication instruction.The manual intervention mode is according to the communication instruction that reads in being decoded, parsing the control target temperature; Automatically the target temperature of regulative mode is to be stored in the single-chip microcomputer memory, and target temperature is a fixed value.Which kind of control mode no matter; The process of temperature adjustment is consistent; The temperature control process is following: controlled object and adjacent ambient are through temperature measurement module 2; Constant-current source 22 provides constant-current supply, and electric current flows through thermistor, has promptly reflected the temperature value of controlled device attached to the magnitude of voltage at the thermistor two ends of controlled device.Magnitude of voltage after denoising, amplification converts 12 digital quantity to through A/D conversion 21.Because being many TEC, this control system controls system; Therefore also multiple spot is carried out thermometric; Promptly record a plurality of magnitudes of voltage, select, the magnitude of voltage that records is selected to be input to single-chip microcomputer 1 one by one so carry out multichannel through analog selection switch 23 in the native system by a plurality of temperature detecting resistances.
Single-chip microcomputer 1 writes 12 temperature digital amount, according to target temperature, carries out PID and calculates, and the digital quantity that calculates control direction and controlled quentity controlled variable is input to driver module 3.Control voltage digital amount is through D/A conversion circuit 31, and the analog voltage that transforms out is again through operational amplifier to PWM generator 32; PWM generator is modulated the dutycycle of pwm pulse according to the control voltage of single-chip microcomputer 1 output, and dutycycle is big more; The electric current that flows through TEC is big more, otherwise then more little.Drive circuit 33 comprises four groups of unidirectional drive circuit and a drive circuit in bi-directional.Unidirectional drive circuit is made up of operational amplifier and MOSFETT pipe 2N7224, and the electric current that offers TEC is directly proportional with the dutycycle of PWM.Drive circuit in bi-directional is managed by 4 MOSFETT, is respectively 2 P channel mosfet T pipes, and 2 N-channel MOS FETT pipes are formed.The pwm pulse of PWM generator 32 output generating positive and negative voltages, EDM Generator of Adjustable Duty Ratio is realized the conducting of a sense of current, the ending of another direction, and electric current is adjustable; In like manner, another direction conducting, a direction is ended, and electric current is adjustable, realizes bidirectional temperature control.
Claims (9)
1. SCM Based many TEC control system for regulating temperature is characterized in that: said SCM Based many TEC control system for regulating temperature comprise the external command that is used to receive temperature control and the data of the thermometric that collects are calculated each temperature control target control voltage digital quantity single-chip microcomputer, be used for the temperature control object is carried out the driver module of temperature adjustment control and the temperature measurement module that is used for controlled device is carried out thermometric; Said temperature measurement module inserts driver module through single-chip microcomputer.
2. SCM Based many TEC control system for regulating temperature according to claim 1 is characterized in that: said driver module comprises D/A converter, first operational amplifier, PMW generator and drive circuit; Said D/A converter inserts the PMW generator through first operational amplifier; Said PMW generator inserts drive circuit; Said single-chip microcomputer inserts D/A converter.
3. SCM Based many TEC control system for regulating temperature according to claim 2 is characterized in that: said drive circuit is unidirectional drive circuit or drive circuit in bi-directional.
4. SCM Based many TEC control system for regulating temperature according to claim 3 is characterized in that: said D/A converter is 12 D/A converters of AD664.
5. SCM Based many TEC control system for regulating temperature according to claim 1 is characterized in that: said temperature measurement module comprises constant-current source, temperature sensor, second operational amplifier, analog selection switch and A/D converter; Said constant-current source, temperature sensor, second operational amplifier, analog selection switch and A/D converter connect successively; Said A/D converter inserts single-chip microcomputer.
6. SCM Based many TEC control system for regulating temperature according to claim 5, it is characterized in that: said temperature sensor is a thermistor, said thermistor is one or more.
7. SCM Based many TEC control system for regulating temperature according to claim 6 is characterized in that: said A/D converter is 12 A/D converters of AD674.
8. according to the described SCM Based many TEC control system for regulating temperature of the arbitrary claim of claim 1-7, it is characterized in that: said SCM Based many TEC control system for regulating temperature also comprises the communication module that is used to receive control instruction and returns the temperature value that collects; Said communication module is connected with single-chip microcomputer.
9. SCM Based many TEC control system for regulating temperature according to claim 1, it is characterized in that: the model of said single-chip microcomputer is 80C32.
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Cited By (10)
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| CN105068580A (en) * | 2015-08-31 | 2015-11-18 | 佛山市顺德区美的电热电器制造有限公司 | A temperature control system, a bread maker and a juice extractor |
| CN105202807A (en) * | 2015-10-29 | 2015-12-30 | 中原工学院 | Running control strategy of solar energy spray refrigerating system |
| CN105353804A (en) * | 2015-11-06 | 2016-02-24 | 锐莱特精密光电技术无锡有限公司 | High-precision multi-channel temperature control system |
| CN105627620A (en) * | 2014-10-27 | 2016-06-01 | 南京长峰航天电子科技有限公司 | Wide-temperature control system based on semiconductor refrigeration sheet and method thereof |
| CN106091508A (en) * | 2016-07-22 | 2016-11-09 | 沈阳理工大学 | A kind of control system of semiconductor temperature-control case |
| CN106873663A (en) * | 2017-01-22 | 2017-06-20 | 中国电子科技集团公司第十研究所 | A kind of temprature control method and system |
| CN108398970A (en) * | 2017-10-23 | 2018-08-14 | 姜倩 | A kind of high-performance temperature control system based on ADN8831 |
| CN108879243A (en) * | 2018-06-06 | 2018-11-23 | 安费诺精密连接器(深圳)有限公司 | A kind of connector and charging gun with function of temperature control |
| CN112254826A (en) * | 2020-09-02 | 2021-01-22 | 哈尔滨新光光电科技股份有限公司 | Thermal infrared imager temperature control system for restraining detector temperature drift |
| WO2021209006A1 (en) * | 2020-04-16 | 2021-10-21 | 深圳见炬科技有限公司 | High-dimensional thermoelectrics-based great-heat and high-heat-flow-density heat transfer and heat dissipation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108398970A (en) * | 2017-10-23 | 2018-08-14 | 姜倩 | A kind of high-performance temperature control system based on ADN8831 |
| CN108879243A (en) * | 2018-06-06 | 2018-11-23 | 安费诺精密连接器(深圳)有限公司 | A kind of connector and charging gun with function of temperature control |
| WO2021209006A1 (en) * | 2020-04-16 | 2021-10-21 | 深圳见炬科技有限公司 | High-dimensional thermoelectrics-based great-heat and high-heat-flow-density heat transfer and heat dissipation method |
| CN112254826A (en) * | 2020-09-02 | 2021-01-22 | 哈尔滨新光光电科技股份有限公司 | Thermal infrared imager temperature control system for restraining detector temperature drift |
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