CN201993599U - Self-turning PID (piping and instruments diagram) controller - Google Patents
Self-turning PID (piping and instruments diagram) controller Download PDFInfo
- Publication number
- CN201993599U CN201993599U CN2011200822493U CN201120082249U CN201993599U CN 201993599 U CN201993599 U CN 201993599U CN 2011200822493 U CN2011200822493 U CN 2011200822493U CN 201120082249 U CN201120082249 U CN 201120082249U CN 201993599 U CN201993599 U CN 201993599U
- Authority
- CN
- China
- Prior art keywords
- circuit
- change
- self
- chip microcomputer
- controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
A self-turning PID (piping and instruments diagram) controller is composed of a switch power circuit, an analog quantity input signal acquisition and conversion circuit, a multi-channel selector, a differential signal amplifying circuit, an A/D (analog to digital) conversion circuit, a photoelectric coupling isolation circuit, a single chip microcomputer, a D/A (digital to analog) conversion circuit, an output driving circuit and a communication circuit. The switch power circuit comprises a PWM (pulse-width modulation) modulation circuit, a push-pull circuit, a transformer and a full-bridge rectifier. The whole self-turning process is completed by the single chip microcomputer, and the self-turning PID controller does not need to operate in open loop and is stable and reliable. The real-time acquisition data and the parameter of the controller system can be displayed in the form of images in an upper computer through a RS458 interface and the standard Modbus protocol. If the control effect is not ideal after the self turning is completed, users can adjust three parameter values on line through the upper computer debugging interface, until control requirements are met. Simultaneously the self-turning PID controller is small in size, low in cost and capable of applying to the automatic control field of process industries widely.
Description
Technical field
The utility model relates to the controller field, relates in particular to a kind of PID controller.
Background technology
Along with the industrial development of modern process, control loop is increasing, simple PID has controlled the Optimal Control requirement when the adaption object system performance changes well, and manually adjust parameter in control accuracy with adjust the control requirement that all can not satisfy the objective system that changes constantly on the frequency, existing multiple intelligent controller with the pid parameter self-setting function process of adjusting mostly is complicated and influential to the working control process at present.
Summary of the invention
For adjust mostly complexity and to the influential problem of working control process of the intelligent controller that solves the pid parameter self-setting function, the utility model provides a kind of PID from adjusting controller.
The technical scheme that the utility model is adopted for achieving the above object is: a kind of PID is from adjusting controller, by switching power circuit, the analog quantity input signal is gathered and change-over circuit, MUX, the differential wave amplifying circuit, the A/D change-over circuit, optical coupling isolation circuit, single-chip microcomputer, the D/A change-over circuit, output driving circuit and communicating circuit are formed, switching power circuit and analog quantity input signal are gathered and change-over circuit, single-chip microcomputer is connected with communicating circuit, the collection of analog quantity input signal is connected with the MUX input end with the change-over circuit output terminal, the MUX output terminal is connected with the differential wave input amplifier, the differential wave amplification circuit output end be connected with A/D change-over circuit input end, A/D change-over circuit output terminal is connected with the single-chip microcomputer input end through optical coupling isolation circuit, and the single-chip microcomputer output terminal is through optical coupling isolation circuit and MUX, the D/A change-over circuit, output driving circuit is connected with communicating circuit.
Described communicating circuit is the RS485 communicating circuit.
Described switching power circuit comprises PWM modulation circuit, push-pull circuit, transformer and full bridge rectifier, PWM modulation circuit input end is connected with the push-pull circuit input end, push-pull circuit is connected with the transformer input end, and the transformer output terminal is connected with full bridge rectifier.
PID of the present utility model is from adjusting controller, and the whole process of adjusting is certainly finished by Single-chip Controlling, need not system's open loop operation, and is reliable and stable; Data of gathering and controller system parameter all can be carried out the picture demonstration at host computer by the Modbus agreement of RS485 interface and standard in real time; After finishing from adjusting if the undesirable value that also can debug online adjusting PID three parameters in interface by host computer of control effect, till satisfying the control requirement; This controller volume is little simultaneously, and cost is low, can be widely used in the process industrial automation field.
Description of drawings
Fig. 1 is that the utility model PID is from the schematic block circuit diagram of adjusting controller.
Fig. 2 is the switching power circuit schematic diagram of the utility model the utility model PID from the controller of adjusting.
Fig. 3 is the thermal resistance metering circuit figure of the utility model the utility model PID from the controller of adjusting.
Embodiment
This practical PID from the circuit theory of the controller of adjusting as shown in Figure 1, by switching power circuit, the analog quantity input signal is gathered and change-over circuit, MUX, the differential wave amplifying circuit, the A/D change-over circuit, optical coupling isolation circuit, single-chip microcomputer, the D/A change-over circuit, output driving circuit and communicating circuit are formed, switching power circuit and analog quantity input signal are gathered and change-over circuit, single-chip microcomputer is connected with communicating circuit, the collection of analog quantity input signal is connected with the MUX input end with the change-over circuit output terminal, the MUX output terminal is connected with the differential wave input amplifier, the differential wave amplification circuit output end be connected with A/D change-over circuit input end, A/D change-over circuit output terminal is connected with the single-chip microcomputer input end through optical coupling isolation circuit, and the single-chip microcomputer output terminal is through optical coupling isolation circuit and MUX, the D/A change-over circuit, output driving circuit is connected with communicating circuit.
The PID controller is a core with the AVR single-chip microcomputer, finishes to 8 road analog signals collections output of 2 road 4-20mA current signals, the control of output of 2 road pwm control signals and 1 road RS485 communicating circuit serial communication interface.Collection of analog quantity input signal and change-over circuit can carry out signals collecting to multiple sensors, comprise thermal resistance, thermopair, standard 4-20mA and 1-5V signal, also need one the tunnel and import as the cold junction compensation signal when external thermopair.The type of external sensor can be selected by the software of single-chip microcomputer inside.The process MUX is carried out the A/D conversion after amplifying 30 times with the differential amplifier circuit with high cmrr after the analog signals input, and will change digital quantity afterwards and send into single-chip microcomputer.Single Chip Microcomputer (SCM) program is carried out linearization process to sampled value, compares with setting value then, and carries out the PID computing according to error, the output of control 4-20mA electric current or pwm pulse signal.The RS485 communicating circuit can be used for carrying out real-time Communication for Power with host computer.
Switching power circuit as shown in Figure 2, power supply partly needs three groups of outputs of isolating mutually, the one tunnel altogether+5V and-the 5V power supply partly powers for analog acquisition, one tunnel+5V powers to single chip part, another road+5V gives the power supply of RS485 communicating circuit.The control signal of output then adopts outside 24V input voltage to drive, and adopts the isolated form push-pull circuit to produce needed voltage.Outside input+24V voltage is stabilized in+5V through LM2576, is used for chip and push-pull circuit power supply to PWM modulation circuit part.Modulation circuit output has the dead band, and phase differential is 180 ° two-way square-wave signal, controls two switching tube s1 and s2 alternate conduction in the push-pull circuit respectively, thereby makes the electric current that produces alternation in the primary coil of transformer.The frequency of control signal is 125KHz, and dutycycle is 7:16, just has the 0.5ms dead band like this between two switching tube s1 and s2 alternate conduction, has avoided the situation of conducting simultaneously.Transformer secondary output uses SPX1117 to carry out linear voltage stabilization.SPX1117 is a kind of forward voltage regulator of low pressure reduction, has very low quiescent current, and its low pressure reduction only is 1.1V when full load.Its output is through just producing the very little voltage of ripple after 100mF alminium electrolytic condenser and the filtering of 0.1mF ceramic condenser.For-5V voltage, because its output power is very little, therefore use the stabilivolt voltage stabilizing just can meet design requirement.
Analog input signal gather with change-over circuit in the thermal resistance metering circuit as shown in Figure 3, for external thermal resistance sensor, adopt the three-wire system connection, by unbalanced bridge the variation of resistance value is converted into magnitude of voltage.Rt is external thermal resistance sensors such as PT100 among the figure, R4, R5 and TVS1, TVS2(Transient Suppression Diode) form input protection circuit, when the input mistake adds the hectovolt high pressure, can not damage controller.Thermocouple sensor is input as millivolt signal, can directly be input to MUX by above-mentioned holding circuit.For the input of 1-5V voltage signal,, it is carried out 100 times of decay because the restriction of the input voltage range of analog switch and A/D converter need change above-mentioned holding circuit into signal attenuation circuit.Decay again afterwards and also need to be converted into voltage by 200 Ω resistance earlier for the 4-20mA current signal.The voltage signal that obtains is at last sent into MUX CD4052 after capacitor filtering, by Single-chip Controlling which signal is sampled.Every CD4052 reserves one the road and inserts the power supply earth signal, as school zero input, in order to bucking-out system in program the time float with temperature and float
[7]Input signal amplifies through the differential amplifier circuit with high cmrr, and sends into ICL7135 after the filtering once more and carry out the A/D conversion, and the digital quantity after the conversion is sent into single-chip microcomputer with the form of binary-coded decimal.ICL7135 is a double oblique integral formula A/D converter, has 14 bit resolutions, and the change-over period is 80ms when using the 500KHz clock frequency, is the integral multiple of power frequency period, therefore can suppress common mode interference effectively.
Controller can be exported the control signal of two kinds of forms, is respectively all adjustable pwm signal of 4-20mA current signal and cycle and dutycycle.4-20mA electric current output adopts 10 D/A conversion chip MAX504, and the 0-2.048V voltage of its output is converted to current signal by 100 Ω precision resistances, uses triode then and carries out current drives.The square-wave signal that the PWM output channel produces can be used for opening of pilot relay and disconnects after darlington array output chip for driving ULN2803 drives.Serial communication interface adopts the RS485 balanced differential circuit of host-guest architecture form; work in half-duplex mode; the MAX485 chip of being produced by U.S. core company carries out the conversion between Transistor-Transistor Logic level and the RS485 level, has used on the synchronous signal output line can recover fuse and TVS protects.For communication state displaying intuitively, adopt dichromatic LED to indicate, the bright expression single-chip microcomputer of green light received signal, the bright expression single-chip microcomputer of red light sends signal.
Claims (3)
1. a PID is from adjusting controller, it is characterized in that: by switching power circuit, the analog quantity input signal is gathered and change-over circuit, MUX, the differential wave amplifying circuit, the A/D change-over circuit, optical coupling isolation circuit, single-chip microcomputer, the D/A change-over circuit, output driving circuit and communicating circuit are formed, switching power circuit and analog quantity input signal are gathered and change-over circuit, single-chip microcomputer is connected with communicating circuit, the collection of analog quantity input signal is connected with the MUX input end with the change-over circuit output terminal, the MUX output terminal is connected with the differential wave input amplifier, the differential wave amplification circuit output end be connected with A/D change-over circuit input end, A/D change-over circuit output terminal is connected with the single-chip microcomputer input end through optical coupling isolation circuit, and the single-chip microcomputer output terminal is through optical coupling isolation circuit and MUX, the D/A change-over circuit, output driving circuit is connected with communicating circuit.
2. a kind of PID according to claim 1 is from adjusting controller, it is characterized in that: described switching power circuit comprises PWM modulation circuit, push-pull circuit, transformer and full bridge rectifier, PWM modulation circuit input end is connected with the push-pull circuit input end, push-pull circuit is connected with the transformer input end, and the transformer output terminal is connected with full bridge rectifier.
3. a kind of PID according to claim 1 is from adjusting controller, and it is characterized in that: described communicating circuit is the RS485 communicating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200822493U CN201993599U (en) | 2011-03-25 | 2011-03-25 | Self-turning PID (piping and instruments diagram) controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200822493U CN201993599U (en) | 2011-03-25 | 2011-03-25 | Self-turning PID (piping and instruments diagram) controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201993599U true CN201993599U (en) | 2011-09-28 |
Family
ID=44670084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200822493U Expired - Fee Related CN201993599U (en) | 2011-03-25 | 2011-03-25 | Self-turning PID (piping and instruments diagram) controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201993599U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616838A (en) * | 2013-12-04 | 2014-03-05 | 国家电网公司 | CD code/4-20ma current conversion output module |
| CN103856168A (en) * | 2014-01-29 | 2014-06-11 | 包头市稀宝博为医疗系统有限公司 | MRI (Magnetic Resonance Imaging) B0 compensation amplifier based on PID (Proportion Integration Differentiation) regulation technology and PWM (Pulse-Width Modulation) technology |
| CN104460467A (en) * | 2014-12-25 | 2015-03-25 | 李钢 | Signal output circuit |
| WO2015176306A1 (en) * | 2014-05-23 | 2015-11-26 | 深圳航天科技创新研究院 | Voltage analog signal isolated transmission circuit |
| CN105790593A (en) * | 2014-12-25 | 2016-07-20 | 广东太阳库新能源科技有限公司 | MCU-controlled push-pull boosted circuit |
| CN106227061A (en) * | 2016-07-29 | 2016-12-14 | 江西洪都航空工业集团有限责任公司 | A kind of stagnation temperature analog based on mirror current source |
| CN110007634A (en) * | 2019-05-06 | 2019-07-12 | 石家庄德堃电子科技有限公司 | A kind of process controller control method |
| CN110008763A (en) * | 2019-04-30 | 2019-07-12 | 北京新大陆时代教育科技有限公司 | A kind of the analog sensor equipment and its application of multiplex roles |
| CN110032122A (en) * | 2019-05-06 | 2019-07-19 | 石家庄德堃电子科技有限公司 | A kind of process controller circuit |
| CN110058551A (en) * | 2019-05-06 | 2019-07-26 | 石家庄德堃电子科技有限公司 | A kind of process controller packet control process |
| CN111856985A (en) * | 2020-03-18 | 2020-10-30 | 石家庄德堃电子科技有限公司 | Advanced algorithm intelligent PID process controller |
-
2011
- 2011-03-25 CN CN2011200822493U patent/CN201993599U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616838A (en) * | 2013-12-04 | 2014-03-05 | 国家电网公司 | CD code/4-20ma current conversion output module |
| CN103856168A (en) * | 2014-01-29 | 2014-06-11 | 包头市稀宝博为医疗系统有限公司 | MRI (Magnetic Resonance Imaging) B0 compensation amplifier based on PID (Proportion Integration Differentiation) regulation technology and PWM (Pulse-Width Modulation) technology |
| WO2015176306A1 (en) * | 2014-05-23 | 2015-11-26 | 深圳航天科技创新研究院 | Voltage analog signal isolated transmission circuit |
| CN104460467A (en) * | 2014-12-25 | 2015-03-25 | 李钢 | Signal output circuit |
| CN105790593A (en) * | 2014-12-25 | 2016-07-20 | 广东太阳库新能源科技有限公司 | MCU-controlled push-pull boosted circuit |
| CN106227061A (en) * | 2016-07-29 | 2016-12-14 | 江西洪都航空工业集团有限责任公司 | A kind of stagnation temperature analog based on mirror current source |
| CN110008763A (en) * | 2019-04-30 | 2019-07-12 | 北京新大陆时代教育科技有限公司 | A kind of the analog sensor equipment and its application of multiplex roles |
| CN110008763B (en) * | 2019-04-30 | 2024-03-08 | 北京新大陆时代教育科技有限公司 | Multi-interface analog sensor equipment and application thereof |
| CN110007634A (en) * | 2019-05-06 | 2019-07-12 | 石家庄德堃电子科技有限公司 | A kind of process controller control method |
| CN110032122A (en) * | 2019-05-06 | 2019-07-19 | 石家庄德堃电子科技有限公司 | A kind of process controller circuit |
| CN110058551A (en) * | 2019-05-06 | 2019-07-26 | 石家庄德堃电子科技有限公司 | A kind of process controller packet control process |
| CN111856985A (en) * | 2020-03-18 | 2020-10-30 | 石家庄德堃电子科技有限公司 | Advanced algorithm intelligent PID process controller |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201993599U (en) | Self-turning PID (piping and instruments diagram) controller | |
| CN105223939A (en) | Be applicable to the multi-source heat transfer agent data acquisition and controlling integration fexible unit of agriculture Internet of Things application | |
| CN103092230B (en) | Diffusion furnace smart temperature control system | |
| CN203551134U (en) | Multipath analog quantity industrial acquisition device | |
| CN103411010B (en) | A kind of gas ratio valve PWM drive circuit | |
| CN203705992U (en) | Temperature control device | |
| CN205121255U (en) | Control system based on singlechip | |
| CN105259841B (en) | A kind of industrial many reference amounts data acquisition unit | |
| CN205103648U (en) | Multisource sensing information acquisition and control integration multipurpose plant suitable for networking of agricultural thing is used | |
| CN201374015Y (en) | Gas chromatograph temperature control circuit | |
| CN206072476U (en) | A kind of valve control device adjusted for fluid flow | |
| CN205068070U (en) | Industrial control ware based on STM32 singlechip | |
| CN106770638B (en) | Electric eddy current sensor | |
| CN210513401U (en) | Vibration transmitter based on MEMS sensor | |
| CN209311606U (en) | A kind of multifunctional electric meter | |
| CN203759084U (en) | Multi-communication mode electric power meter | |
| CN203836339U (en) | Intelligent flow regulating controller of heat supply pipe network system | |
| CN205121256U (en) | Take controller of chinese character demonstration based on singlechip | |
| CN203785827U (en) | Tension detection system for hydraulic tightening device | |
| CN102981472B (en) | A kind of Universal analog acquisition module based on double integrator | |
| CN202661912U (en) | Portable programmable power supply device | |
| CN203477541U (en) | Gas proportional valve PWM (Pulse-Width Modulation) drive circuit | |
| CN105203232A (en) | Two-wire system pressure acquisition transmitter | |
| CN111522263A (en) | Programmable multipurpose digital power regulator | |
| CN201764976U (en) | Loop-powered-type smart transmitter isolated from site sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110928 Termination date: 20140325 |