CN102880204A - Digital temperature control system based on high-time-lag controlled object - Google Patents

Digital temperature control system based on high-time-lag controlled object Download PDF

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CN102880204A
CN102880204A CN2012103560650A CN201210356065A CN102880204A CN 102880204 A CN102880204 A CN 102880204A CN 2012103560650 A CN2012103560650 A CN 2012103560650A CN 201210356065 A CN201210356065 A CN 201210356065A CN 102880204 A CN102880204 A CN 102880204A
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temperature
module
digital
control system
temperature control
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CN102880204B (en
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裴闯
武丽花
凌林本
谷健
白永杰
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707th Research Institute of CSIC
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707th Research Institute of CSIC
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Abstract

The invention relates to a digital temperature control system based on a high-time-lag controlled object. The digital temperature control system is mainly characterized by comprising a plurality of temperature detection circuits, a digital signal processing (DSP) module, a power amplifier and a digital proportion, integration and differentiation (PID) control device, wherein the DSP module comprises an analog/digital (A/D) conversion unit, a central processing unit (CPU) and a pulse width modulation (PWM) output unit; one end of each temperature detection circuit is connected with a thermistor sensor of the controlled object, and the other end of each temperature detection circuit is connected to the CPU through the A/D conversion unit; the CPU is connected to the power amplifier through the PWM output unit; the output end of the power amplifier is connected to a heater of the controlled object; and the CPU is also connected with the digital PID control device to realize a combined control function of a plurality of temperature control regions. By the digital temperature control system, the controlled object is divided into a plurality of temperature control regions; the DSP module acquires temperature data of the temperature control regions and processes the temperature data, so that the combined control function to the controlled object is realized; and the digital temperature control system has the characteristics of high precision, sensitivity to reaction, high reliability, small size and the like.

Description

A kind of digital temperature control system based on the large dead time controlled device
Technical field
The invention belongs to the temperature control technology field, particularly a kind of digital temperature control system based on the large dead time controlled device.
Background technology
In the temperature control technology field, according to the speed of heat conduction velocity, controlled device mainly is divided into two kinds: a kind of is Small Time Lag, and another kind is large dead time.Compare with the Small Time Lag controlled device, the temperature control of large dead time controlled device is comparatively complicated, and not only accuracy of temperature control is difficult to improve, and thermograde is also larger, therefore, when having larger dead time delay link for controlled device, is difficult to realize accurately control.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of digital temperature control system based on the large dead time controlled device is provided, solved larger dead time delay link and be difficult to the precisely problem of control.
The present invention solves its technical matters and takes following technical scheme to realize:
A kind of digital temperature control system based on the large dead time controlled device, comprise a plurality of temperature sensing circuits, the DSP module, power amplifier and digital PID control device, each temperature sensing circuit is by temperature detection bridge circuit module, pre-amplifier module and voltage transformation module connect and compose successively, the DSP module comprises the A/D converting unit, CPU element and PWM output unit, each temperature detection bridge circuit module one end connects the heat sensor of controlled device, the other end connects an end of pre-amplifier module, the output terminal of pre-amplifier module connects voltage transformation module, the other end of this voltage transformation module is connected to CPU element by the A/D converting unit, this CPU element is connected on the power amplifier by the PWM output unit, the output terminal of this power amplifier is connected on the well heater of controlled device, and this CPU element also is connected with the digital PID control device and realizes the function that jointly controls to a plurality of temperature controlled region.。
And, described temperature detection bridge circuit module is made of with thermistor two measuring resistances, a temperature adjustment resistance and a thermometric, thermistor is installed in the thermometric position of controlled device, temperature adjustment resistance is external, one end of two measuring resistances links to each other and ground connection, an other end connects respectively temperature adjustment resistance and thermistor, an other end of temperature adjustment resistance and thermistor links to each other and connects+the 5V power supply, and the link of two measuring resistances and temperature adjustment resistance and thermistor connects two input ends of pre-amplifying module.
And described pre-amplifier module adopts differential amplifier INA118 to make up and forms.
And described voltage transformation module has adopted four-operational amplifier TLC2274.
And described DSP module adopts the TMS320F28335 chip.
And described power amplifier module is connected and composed by switch power amplifier IRLML2502 and amplifier chip OP295.
And described digital PID control device adopts is digital PID control device with Smith Predictor.
Advantage of the present invention and good effect are:
The present invention is divided into a plurality of temperature controlled region with controlled device, each temperature controlled region adopts resistance bridge that controlled device is carried out temperature detection, the DSP module by gathering each temperature controlled region temperature data and carry out data and process the function that jointly controls that realizes controlled device, when controlled device temperature during far below preset temperature, the electric current of heating is larger, has realized being rapidly heated; When near preset temperature, the electric current of heating is less, has also avoided the vibration of temperature control system when having realized accurate temperature control, makes whole adjustment process quick and precisely.Not only precisely control thermograde, and improved accuracy of temperature control, under the condition of environmental interface temperature fluctuation ± 1 ℃, accuracy of temperature control once had been better than percent.The present invention have precision high, be quick on the draw, the characteristics such as reliability is high, volume is little.
Description of drawings
Fig. 1 is system of the present invention connection diagram;
Fig. 2 is the temperature control loop schematic diagram of a temperature controlled region;
Fig. 3 is the theory diagram with the digital PID control device of Smith Predictor.
Embodiment
Below in conjunction with accompanying drawing invention is further described:
A kind of digital temperature control system based on the large dead time controlled device, as shown in Figure 1, comprise a plurality of temperature sensing circuits, DSP module, power amplifier and with the digital PID control device of Smith Predictor, thermograde characteristics according to controlled device, controlled device can be divided into a plurality of temperature controlled region and jointly control, the present embodiment provides controlled device and is divided into eight temperature controlled region.Each temperature sensing circuit is connected and composed successively by temperature detection bridge circuit module, pre-amplifier module and voltage transformation module, the DSP module comprises A/D converting unit, CPU element and PWM output unit, because the DSP module need to gather the temperature of eight road temperature sensing circuits, therefore, the AD converting unit also is eight and is connected respectively on the CPU element.The connected mode of each several part circuit is in the control system: each temperature detection bridge circuit module one end connects on the heat sensor of controlled device, the other end connects an end of pre-amplifier module, the output terminal of pre-amplifier module connects voltage transformation module, the other end of this voltage transformation module is connected to CPU element by the A/D converting unit in the DSP module, this CPU element is connected on the power amplifier by the PWM output unit, and the output terminal of this power amplifier connects on the well heater of controlled device.CPU element in the DSP module also is connected with digital PID control device with Smith Predictor, by the Digital PID Algorithm of this digital PID control device the data of conversion storage is processed, to realize jointly controlling of eight temperature controlled region.The below describes respectively the various piece in the control system:
As shown in Figure 2, temperature detection bridge circuit module adopts the resistance bridge structure, and its advantage is that precision is high, is quick on the draw.Each temperature detection bridge circuit module is made of with thermistor two measuring resistances, a temperature adjustment resistance and a thermometric, and thermistor is installed in the thermometric position of controlled device, and temperature adjustment resistance is external.One end of two measuring resistances links to each other and ground connection, and an other end connects respectively temperature adjustment resistance and thermistor, and an other end of temperature adjustment resistance and thermistor links to each other and connects+the 5V power supply.The link of measuring resistance and temperature adjustment resistance and thermistor connects two input ends of pre-amplifying module.
Pre-amplifier module adopts differential amplifier INA118 to make up and forms, adjust the enlargement factor of pre-amplifying module by the adjusting resistance value, this INA118 amplifier can be realized the accurate control to enlargement factor, the introducing of this device is so that not only voltage amplification factor is easy to adjust, also effectively simplify circuit structure, be beneficial to the reliability that improves control system.
Voltage transformation module has adopted four-operational amplifier TLC2274, and the input signal of voltage transformation module is provided by pre-amplifying module, and its voltage range is-5V～+ 5V, output signal is supplied with the A/D converting unit of DSP module, and its voltage range is 0V～3V.
The DSP module is selected the novel floating-point operation DSP TMS320F28335 of TI company, this integrated chip 16 tunnel 12 high-precision A/D converting unit and 16 tunnel PWM output unit, and its CPU frequency is high, fast operation, is convenient to realize various control algolithms.
Power amplifier module comprises switch power amplifier IRLML2502 and amplifier OP295, switch power amplifier IRLML2502 controls the break-make of the electric current of heating, this switch power amplifier not only effectively reduces the power consumption of power amplifier module, and significantly dwindled the volume of this module, be conducive to the integrated of whole temperature control system circuit, simultaneously, this power amplifier module adopts amplifier OP295 to consist of voltage follower, realize the effect of isolation signals, avoid power amplifier module that DSP is impacted.
The principle of work of this digital temperature control system is:
1, temperature detection principle
As shown in Figure 1, when certain regional temperature of controlled device is lower than this zone preset temperature, the resistance of its thermistor is less than the resistance of temperature adjustment resistance, this detection bridge circuit does not reach balance, its output signal is carried out differential amplification by pre-amplifying module, draw unbalanced signal, this unbalanced signal is as the feedback signal of this temperature controlled region temperature closed loop control.
When the temperature of controlled device reached preset temperature, the resistance of thermistor should equal the resistance of temperature adjustment resistance.At this moment, the sensitivity of temperature detection bridge circuit is the highest, and signal difference is:
ΔU = ΔR ΔR + R + Rt U
Because Δ R Rt, so but the signal difference approximate representation be:
ΔU = ΔR R + Rt U
Wherein:
R is the resistance of measuring resistance, and U represents supply voltage.
2, data processing principle
Data are processed take the DSP module as core, and the signal that its A/D converting unit provides pre-amplifying module is sampled and changed, and the data after will changing are stored.
Employing is processed the data of conversion storage with the digital PID control device of Smith Predictor, to realize jointly controlling of eight temperature controlled region.As shown in Figure 3, with the digital PID control device of Smith Predictor, u (k) is the output of Digital PID Controller, and y τ (k) is the output of Smith Predictor.
e τ(k)=e(k)-y τ(k)=r(k)-y(k)-y τ(k)
Digital PID control with Smith Predictor is output as:
u(k)=u(k-1)+Δu(k)=u(k-1)+K p(e τ(k)-e τ(k-1))+K ie τ(k)
+K d(e τ(k)-2e τ(k-1)+e τ(k-2))
In the formula, K pBe the scale-up factor of digital PID control, K i=K pT/T iBe integral coefficient, K d=K pT d/ T is differential coefficient.
Behind the Digital PID Algorithm of band Smith Predictor, the result that DSP will process is converted into the dutycycle of corresponding PWM output.
3, temperature control principle
DSP module output pwm signal is to power amplifier module, is converted into the well heater that the control current signal puts on controlled device by this module, realizes thus temperature control, so that the temperature of controlled device levels off to preset temperature.
It is emphasized that; embodiment of the present invention is illustrative; rather than determinate; therefore the present invention is not limited to the embodiment described in the embodiment; every other embodiments that drawn by those skilled in the art's technical scheme according to the present invention belong to the scope of protection of the invention equally.

Claims (7)

1. digital temperature control system based on the large dead time controlled device, it is characterized in that: comprise a plurality of temperature sensing circuits, the DSP module, power amplifier and digital PID control device, each temperature sensing circuit is by temperature detection bridge circuit module, pre-amplifier module and voltage transformation module connect and compose successively, the DSP module comprises the A/D converting unit, CPU element and PWM output unit, each temperature detection bridge circuit module one end connects the heat sensor of controlled device, the other end connects an end of pre-amplifier module, the output terminal of pre-amplifier module connects voltage transformation module, the other end of this voltage transformation module is connected to CPU element by the A/D converting unit, this CPU element is connected on the power amplifier by the PWM output unit, the output terminal of this power amplifier is connected on the well heater of controlled device, and this CPU element also is connected with the digital PID control device and realizes the function that jointly controls to a plurality of temperature controlled region.
2. a kind of digital temperature control system based on the large dead time controlled device according to claim 1, it is characterized in that: described temperature detection bridge circuit module is by two measuring resistances, a temperature adjustment resistance and a thermometric consist of with thermistor, thermistor is installed in the thermometric position of controlled device, temperature adjustment resistance is external, one end of two measuring resistances links to each other and ground connection, an other end connects respectively temperature adjustment resistance and thermistor, an other end of temperature adjustment resistance and thermistor links to each other and connects+the 5V power supply, and the link of two measuring resistances and temperature adjustment resistance and thermistor connects two input ends of pre-amplifying module.
3. a kind of digital temperature control system based on the large dead time controlled device according to claim 1 is characterized in that: described pre-amplifier module adopts differential amplifier INA118 to make up and forms.
4. a kind of digital temperature control system based on the large dead time controlled device according to claim 1, it is characterized in that: described voltage transformation module has adopted four-operational amplifier TLC2274.
5. a kind of digital temperature control system based on the large dead time controlled device according to claim 1 is characterized in that: described DSP module employing TMS320F28335 chip.
6. a kind of digital temperature control system based on the large dead time controlled device according to claim 1, it is characterized in that: described power amplifier module is connected and composed by switch power amplifier IRLML2502 and amplifier chip OP295.
7. a kind of digital temperature control system based on the large dead time controlled device according to claim 1 is characterized in that: described digital PID control device adopts is digital PID control device with Smith Predictor.
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Publication number Priority date Publication date Assignee Title
CN115328231A (en) * 2022-08-29 2022-11-11 中山市创艺生化工程有限公司 Reagent constant temperature circuit for blood analyzer

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