CN102880204B - A kind of digital temperature control system based on large dead time controlled device - Google Patents

A kind of digital temperature control system based on large dead time controlled device Download PDF

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Publication number
CN102880204B
CN102880204B CN201210356065.0A CN201210356065A CN102880204B CN 102880204 B CN102880204 B CN 102880204B CN 201210356065 A CN201210356065 A CN 201210356065A CN 102880204 B CN102880204 B CN 102880204B
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module
temperature
controlled
amplifier
digital
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CN102880204A (en
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裴闯
武丽花
凌林本
谷健
白永杰
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No 707 Research Institute of China Shipbuilding Industry Corp
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No 707 Research Institute of China Shipbuilding Industry Corp
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Abstract

The present invention relates to a kind of digital temperature control system based on large dead time controlled device, its technical characteristics is: comprise multiple temperature sensing circuit, DSP module, power amplifier and digital IIR filters device, DSP module comprises A/D converting unit, CPU element and PWM output unit, each temperature sensing circuit one end connects the heat sensor of controlled device, the other end is connected to CPU element by A/D converting unit, this CPU element is connected on power amplifier by PWM output unit, the output terminal of this power amplifier is connected on the well heater of controlled device, this CPU element is also connected with digital IIR filters device and realizes jointly controlling function to multiple temperature controlled region.Controlled device is divided into multiple temperature controlled region by the present invention, DSP module by gathering the temperature data of each temperature controlled region and carrying out data processing and realize jointly controlling function to controlled device, have precision high, be quick on the draw, the feature such as reliability is high, volume is little.

Description

A kind of digital temperature control system based on large dead time controlled device
Technical field
The invention belongs to technical field of temperature control, particularly a kind of digital temperature control system based on large dead time controlled device.
Background technology
In temperature control technology field, according to the speed of heat conduction velocity, controlled device is mainly divided into two kinds: a kind of is Small Time Lag, and another kind is large dead time.Compared with Small Time Lag controlled device, the temperature of large dead time controlled device controls comparatively complicated, and not only accuracy of temperature control is difficult to improve, and thermograde is also larger, therefore, when there is larger link with pure time delay for controlled device, is difficult to realize controlling accurately.
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 large dead time controlled device is provided, solve the problem that larger link with pure time delay is difficult to precisely control.
The present invention solves its technical matters and takes following technical scheme to realize:
A kind of digital temperature control system based on large dead time controlled device, comprise multiple temperature sensing circuit, DSP module, power amplifier and digital IIR filters device, each temperature sensing circuit is by temperature detection bridge road module, pre-amplifier module and voltage transformation module connect and compose successively, DSP module comprises A/D converting unit, CPU element and PWM output unit, module one end, each temperature detection bridge road connects the heat sensor of controlled device, the other end connects one 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 A/D converting unit, this CPU element is connected on power amplifier by PWM output unit, the output terminal of this power amplifier is connected on the well heater of controlled device, this CPU element is also connected with digital IIR filters device and realizes jointly controlling function to multiple temperature controlled region.。
And, described temperature detection bridge road module is made up of two measuring resistances, a temperature adjustment resistance and a thermometric thermistor, thermistor is arranged on the thermometric position of controlled device, temperature adjustment resistance is external, one end of two measuring resistances is connected and ground connection, one end connects temperature adjustment resistance and thermistor respectively in addition, temperature adjustment resistance is connected with other one end of thermistor and connects+5V power supply, and the link of two measuring resistances and temperature adjustment resistance and thermistor is connected two input ends of pre-amplifying module.
And described pre-amplifier module adopts differential amplifier INA118 to build and forms.
And described voltage transformation module have employed four-operational amplifier TLC2274.
And described DSP module adopts TMS320F28335 chip.
And described power amplifier module is connected and composed by switch power amplifier IRLML2502 and amplifier chip OP295.
And what described digital IIR filters device adopted is the digital IIR filters device being with Smith Predictor.
Advantage of the present invention and good effect are:
Controlled device is divided into multiple temperature controlled region by the present invention, each temperature controlled region adopts resistance bridge to carry out temperature detection to controlled device, DSP module is by gathering the temperature data of each temperature controlled region and carrying out data processing and realize jointly controlling function to controlled device, when controlled device temperature is far below preset temperature, warming current is comparatively large, achieves and is rapidly heated; When close to preset temperature, warming current is less, also avoid the vibration of temperature control system while achieving accurate temperature control, makes whole adjustment process quick and precisely.Not only accurate control temperature gradient, and improve accuracy of temperature control, under the condition of environmental interface temperature fluctuation ± 1 DEG C, accuracy of temperature control had once been better than percent.The present invention have precision high, be quick on the draw, the feature such as reliability is high, volume is little.
Accompanying drawing explanation
Fig. 1 is system connection diagram of the present invention;
Fig. 2 is the temperature control loop schematic diagram of a temperature controlled region;
Fig. 3 is the theory diagram of the digital IIR filters device of band Smith Predictor.
Embodiment
Below in conjunction with accompanying drawing, invention is further described:
A kind of digital temperature control system based on large dead time controlled device, as shown in Figure 1, comprise the digital IIR filters device of multiple temperature sensing circuit, DSP module, power amplifier and band Smith Predictor, according to the thermograde feature of controlled device, controlled device can be divided into multiple temperature controlled region 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 road module, pre-amplifier module and voltage transformation module, DSP module comprises A/D converting unit, CPU element and PWM output unit, because DSP module needs the temperature of collection eight road temperature sensing circuit, therefore, AD conversion unit is also eight and is connected respectively in CPU element.In control system, the connected mode of each several part circuit is: module one end, each temperature detection bridge road connects on the heat sensor of controlled device, the other end connects one 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 DSP module, this CPU element is connected on power amplifier by PWM output unit, and the output terminal of this power amplifier connects on the well heater of controlled device.CPU element in DSP module is also connected with the digital IIR filters device of band Smith Predictor, is processed, to realize jointly controlling of eight temperature controlled region the data that conversion stores by the Digital PID Algorithm of this digital IIR filters device.Below the various piece in control system is described respectively:
As shown in Figure 2, temperature detection bridge road module adopts resistance bridge structure, and its advantage is that precision is high, is quick on the draw.Each temperature detection bridge road module is made up of two measuring resistances, a temperature adjustment resistance and a thermometric thermistor, and thermistor is arranged on the thermometric position of controlled device, and temperature adjustment resistance is external.One end of two measuring resistances is connected and ground connection, and one end connects temperature adjustment resistance and thermistor respectively in addition, and temperature adjustment resistance is connected with other one end of thermistor and connects+5V power supply.The link of measuring resistance and temperature adjustment resistance and thermistor is connected two input ends of pre-amplifying module.
Pre-amplifier module adopts differential amplifier INA118 to build and forms, the enlargement factor of pre-amplifying module is adjusted by adjusting resistance value, this INA118 amplifier can realize the accurate control to enlargement factor, the introducing of this device makes not only voltage amplification factor easy to adjust, also effectively simplify circuit structure, be beneficial to the reliability improving control system.
Voltage transformation module have employed 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, and the A/D converting unit of output signal supply DSP module, its voltage range is 0V ~ 3V.
The floating-point operation DSP TMS320F28335 that DSP module selects TI company novel, this integrated chip high-precision A/D conversion unit on 12,16 tunnel and the PWM output unit on 16 tunnels, and also its CPU frequency is high, fast operation, be convenient to realize various control algolithm.
Power amplifier module comprises switch power amplifier IRLML2502 and amplifier OP295, switch power amplifier IRLML2502 controls the break-make of warming current, this switch power amplifier not only effectively reduces the power consumption of power amplifier module, and significantly reduce the volume of this module, be conducive to the integrated of whole temperature control system circuit, meanwhile, this power amplifier module adopts amplifier OP295 to form voltage follower, realize the effect of isolation signals, avoid power amplifier module to impact DSP.
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 region preset temperature, the resistance of its thermistor is less than the resistance of temperature adjustment resistance, this detecting bridge road does not reach balance, its output signal carries out differential amplify by pre-amplifying module, draw unbalanced signal, this unbalanced signal is as the feedback signal of this temperature controlled region temperature scaling factor.
When the temperature of controlled device reaches preset temperature, the resistance of thermistor should equal the resistance of temperature adjustment resistance.At this moment, the sensitivity on temperature detection bridge road is the highest, and signal difference is:
ΔU = ΔR ΔR + R + Rt U
Because Δ R < < is Rt, so signal difference can approximate representation be:
&Delta;U = &Delta;R R + Rt U
Wherein:
R is the resistance of measuring resistance, and U represents supply voltage.
2, data processing principle
Data processing take DSP module as core, and its A/D converting unit is sampled to the signal that pre-amplifying module provides and changed, and the data after conversion is stored.
The digital IIR filters device of band Smith Predictor is adopted to process the data that conversion stores, to realize jointly controlling of eight temperature controlled region.As shown in Figure 3, the digital IIR filters device of band 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)
The output of the digital IIR filters with Smith Predictor is:
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 formula, K pfor the scale-up factor of digital IIR filters, K i=K pt/T ifor integral coefficient, K d=K pt d/ T is differential coefficient.
After the Digital PID Algorithm of band Smith Predictor, the result of process is converted into the dutycycle that corresponding PWM exports by DSP.
3, temperature control principle
DSP module output pwm signal, to power amplifier module, is control the well heater that current signal puts on controlled device by this module converter, realizes temperature thus and control, make the temperatures approach of controlled device in preset temperature.
It is emphasized that; embodiment of the present invention is illustrative; instead of it is determinate; therefore the present invention is not limited to the embodiment described in embodiment; every other embodiments 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 (4)

1. the digital temperature control system based on large dead time controlled device, it is characterized in that: comprise multiple temperature sensing circuit, DSP module, power amplifier and digital IIR filters device, each temperature sensing circuit is by temperature detection bridge road module, pre-amplifier module and voltage transformation module connect and compose successively, DSP module comprises A/D converting unit, CPU element and PWM output unit, module one end, each temperature detection bridge road connects the heat sensor of controlled device, the other end connects one 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 A/D converting unit, this CPU element is connected on power amplifier by PWM output unit, the output terminal of this power amplifier is connected on the well heater of controlled device, this CPU element is also connected with digital IIR filters device and realizes jointly controlling function to multiple temperature controlled region,
Described temperature detection bridge road module is made up of two measuring resistances, a temperature adjustment resistance and a thermometric thermistor, thermistor is arranged on the thermometric position of controlled device, temperature adjustment resistance is external, one end of two measuring resistances is connected and ground connection, one end connects temperature adjustment resistance and thermistor respectively in addition, temperature adjustment resistance is connected with other one end of thermistor and connects+5V power supply, and the link of two measuring resistances and temperature adjustment resistance and thermistor is connected two input ends of pre-amplifying module;
Described power amplifier module is connected and composed by switch power amplifier IRLML2502 and amplifier chip OP295;
What described digital IIR filters device adopted is the digital IIR filters device being with Smith Predictor.
2. a kind of digital temperature control system based on large dead time controlled device according to claim 1, is characterized in that: described pre-amplifier module adopts differential amplifier INA118 to build and forms.
3. a kind of digital temperature control system based on large dead time controlled device according to claim 1, is characterized in that: described voltage transformation module have employed four-operational amplifier TLC2274.
4. a kind of digital temperature control system based on large dead time controlled device according to claim 1, is characterized in that: described DSP module adopts TMS320F28335 chip.
CN201210356065.0A 2012-09-21 2012-09-21 A kind of digital temperature control system based on large dead time controlled device Active CN102880204B (en)

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