CN103343831A - Intelligent electrical valve locator main board hardware circuit - Google Patents
Intelligent electrical valve locator main board hardware circuit Download PDFInfo
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Abstract
The invention relates to an intelligent electrical valve locator main board hardware circuit. A single chip microcomputer circuit is connected with a signal control circuit, a sensor switching circuit, a piezoelectric valve control circuit, a liquid crystal display circuit, an operation keying circuit, an alarm circuit and a valve location drive circuit, and a supply voltage circuit provides working voltages for the signal control circuit, the sensor switching circuit, the single chip microcomputer circuit, the piezoelectric valve control circuit, the liquid crystal display circuit, the operation keying circuit, the alarm circuit and the valve location drive circuit respectively. The intelligent electrical valve locator main board hardware circuit has the advantages that by collecting a two-wire system 4-20mA signal of set valve opening and a fed-back practical valve opening signal of the set valve opening from a regulator, the circuit outputs corresponding control signals to control opening and closing of a piezoelectric valve through blurring operation and decision making after the deviation and the deviation change rate of the two signals are calculated through a single chip microcomputer, therefore, the amount of air entering an adjusting valve air chamber is controlled, a valve element is pushed to move and accurately located, and the aim of automatically adjusting an adjusting valve is achieved.
Description
Technical field
The present invention relates to a kind of control circuit, particularly a kind of intelligent electric valve positioner motherboard hardware circuit.
Background technique
The automatic control of production process is called for short process control, occupies extremely important status in industrial production.Process control develops into the Distributed Control System that analog digital is mixed from analog control system, and further develops into fieldbus control system.The quality of process control depends on Controlling Apparatus for Processes to a great extent, comprises transmitter, regulator, final controlling element and various auxiliary device.Pneumatic control valve is a kind of final controlling element very important in the middle of the process control, and valve positioner can improve the flexibility of valve characteristic, the precision that improves control, speed and increase control as one of main accessories of pneumatic control valve.Valve positioner develops to intelligent, fieldbus instrument direction, to the change that process control has brought technology, has represented the developing direction of pneumatic actuator technology.More external major companies have succeeded in developing intelligent valve positioner in succession, and what have disposes field-bus interfaces such as HART agreement, PROFIBUS bus, FF bus, and domestic in this respect research still is in the starting stage.At present, the intelligent valve positioner that generally uses on the Domestic market, major part is more external major companies, as Siemens, Fei Xier, ABB etc., what domestic electropneumatic valve positioner adopted is traditional mechanical type force balance principle, come with some shortcomings and can not satisfy the needs of process control development, and it is expensive by the intelligent electric positioning work piece of external import, receipt period is long, can not satisfy the Domestic market low cost far away, high-intelligentization, the demand of high progress, press for a kind of low cost of exploitation, high quality, high-intelligentization, the intelligent electric appliance valve positioner of high progress, so research and design intelligent electric pneumatic valve positioner is very necessary.
Summary of the invention
In view of China has the problem that situation and prior art exist at present now, the invention provides a kind of intelligent electric valve positioner motherboard hardware circuit, this circuit is the intelligent electric valve positioner core component.The intelligent valve positioner motherboard circuit of development is based on 4～20mA electric current two-wire system valve navigation system, and general arrangement launches around the realization of low power consumption.This circuit mainly is by gathering from the two-wire system 4-20mA signal of the next setting valve opening of regulator and the actual valve opening signal that feeds back, after through the calculating of single-chip microcomputer to two kinds of deviation of signals and deviation variation rate, go to control the unlatching of piezo electric valve by fuzzy operation and the corresponding control signal of decision-making output, thereby the air inflow that control enters the modulating valve air chamber, promote the spool action and accurately locate the self-regulating purpose of realization modulating valve with this.Simultaneously, in single-chip microcomputer, above two paths of signals is carried out the conversion of scale conversion and binary-coded decimal, so that carry out the percentage demonstration of valve position stroke at liquid crystal display.
The present invention for achieving the above object, the circuit design scheme of taking is: a kind of intelligent electric valve positioner motherboard hardware circuit, it is characterized in that: comprise the SC sigmal control loop, the sensor change-over circuit, single chip circuit, the piezo electric valve control loop, the supply voltage circuit, liquid crystal display circuit, the operation push-button circuit, warning circuit, valve position drive circuit (currrent feedback is used), described single chip circuit respectively with the SC sigmal control loop, the sensor change-over circuit, the piezo electric valve control loop, liquid crystal display circuit, the operation push-button circuit, warning circuit, valve position drive circuit (currrent feedback is used) connects, and described supply voltage circuit is supplied with the SC sigmal control loop respectively, the sensor change-over circuit, single chip circuit, the piezo electric valve control loop, liquid crystal display circuit, the operation push-button circuit, warning circuit, the operating voltage of valve position drive circuit (currrent feedback is used); The SC sigmal control loop comprises tenminal block P, eliminator, measuring resistor, the high-side current detecting amplifier constitutes, the sensor change-over circuit comprises connector assembly X3, bleeder circuit constitutes, single chip circuit comprises single-chip microcomputer, crystal oscillating circuit, reset circuit constitutes, the piezo electric valve control circuit comprises four output driving circuits, connecting terminal constitutes, the supply voltage circuit comprises the voltage-stabiliser tube mu balanced circuit, DC/DC booster transducer, the DC/DC step down transformer constitutes, liquid crystal display circuit comprises LCD MODULE, patching link constitutes, the operation push-button circuit comprises bleeder circuit, touching key switch constitutes, warning circuit comprises NAND gate circuit, connector assembly X2 constitutes, and the valve position drive circuit comprises not circuit, connector assembly X1 constitutes.
Physical circuit is connected to: described SC sigmal control loop; the external 4-20mA signal of No. 2 terminals (signal both positive and negative polarity) of No. 1 terminal (signal positive pole) of tenminal block P and tenminal block P; 2 of tenminal block P; 3; 4; No. 5 terminals also connect an end that meets magnetic bead L2 simultaneously; the pin two of another termination signal inductance L 5 of magnetic bead L2; the pin 4 of signal inductance L 5 connects an end of inductance L 4; the end of the other end connecting resistance R1 of inductance L 4; the end of the other end connecting resistance R2 of resistance R 1; the positive pole of transient protection diode D1 and voltage-stabiliser tube D2 also meets benchmark status GND; No. 1 terminal of tenminal block P connects the end of magnetic bead L1; the pin one of another termination signal inductance L 5 of magnetic bead L1; the pin 3 of signal inductance L 5 connects an end of inductance L 3; the other end connecting resistance R3 of inductance L 3; resistance R 4; the pin 8 of one end of capacitor C 1 and high-side current detecting amplifier U7; the other end of the other end connecting resistance R2 of capacitor C 1; resistance R 3; another termination transient protection diode D1 of resistance R 4; the pin 6 of the negative pole of voltage-stabiliser tube D2 and high-side current detecting amplifier U7; the negative pole of voltage-stabiliser tube D2 connects the positive pole of courage electrochemical capacitor C18; the negative pole of courage electrochemical capacitor C18 meets benchmark status GND; the negative pole of voltage-stabiliser tube D2 is 6V voltage of voltage regulation end; the pin one of high-side current detecting amplifier U7 connects 3V voltage; the pin 3 of high-side current detecting amplifier U7 meets benchmark status GND; the pin 4 connecting resistance R5 of high-side current detecting amplifier U7; one end of capacitor C 2; one end of resistance R 5 another termination capacitor C 21; the general digital I/O pin 3 of single-chip microcomputer U6, capacitor C 2; capacitor C 21 the other ends are connected to benchmark status GND.
Described sensor (leading a plastic potentiometer RW) change-over circuit, external conductive plastic potentiometer RW receives on the connector assembly X3, No. 1 contact pin of connector assembly X3, No. 2 contact pins and connect after connect an end and the 2.5V voltage of capacitor C 3, No. 3 contact pins of connector assembly X3 connect an end of the other end, capacitor C 4 and the resistance R 0 of capacitor C 3, No. 4 contact pins of connector assembly X3 meet the other end of capacitor C 4, an end and the benchmark status GND of capacitor C 5, the other end of the other end connecting resistance R0 of capacitor C 5 and single-chip microcomputer U6 general digital I/O pin 4.
Described piezo electric valve control loop, the end of the general digital I/O pin 38 connecting resistance R19 of single-chip microcomputer U6 and the grid of field effect transistor Q7, source electrode and the benchmark status GND of resistance R 19 another termination field effect transistor Q7, the grid of the end of the drain electrode connecting resistance R20 of field effect transistor Q7, the negative pole of diode D9 and effect pipe Q8, the drain electrode of another termination field effect transistor Q8 of resistance R 20 and the positive pole of 24V voltage, the positive pole of diode D9 connect the source electrode of field effect transistor Q8 and receive connecting terminal P4 contact by resistance R 24.
The end of the general digital I/O pin 39 connecting resistance R17 of single-chip microcomputer U6 and the grid of field effect transistor Q5, resistance R 17 another termination 3V voltages, the source electrode of field effect transistor Q5 meets benchmark status GND, the end of the drain electrode connecting resistance R18 of field effect transistor Q5, the negative pole of diode D8 and the grid of field effect transistor Q6, the drain electrode of another termination field effect transistor Q6 of resistance R 18 and the positive pole of 24V voltage, the positive pole of diode D8 connect field effect transistor Q6 source electrode and receive connecting terminal P3 contact by resistance R 22.
The end of the general digital I/O pin 40 connecting resistance R15 of single-chip microcomputer U6 and the grid of field effect transistor Q3, source electrode and the benchmark status GND of resistance R 15 another termination field effect transistor Q3, the end of the drain electrode connecting resistance R16 of field effect transistor Q3, the negative pole of diode D7 and the grid of field effect transistor Q4, the drain electrode of another termination field effect transistor Q4 of resistance R 16 and the positive pole of 24V voltage, the positive pole of diode D9 connect field effect transistor Q4 source electrode and receive connecting terminal P2 contact by resistance R 22.
The end of the general digital I/O pin 41 connecting resistance R13 of single-chip microcomputer U6 and the grid of field effect transistor Q1, resistance R 13 another termination 3V voltages, the source electrode of field effect transistor Q1 meets benchmark status GND, the grid of Q2 should be managed in the end of the drain electrode connecting resistance R14 of field effect transistor Q1, the negative pole of diode D6 and effect field, the drain electrode of another termination field effect transistor Q2 of resistance R 16 and the positive pole of 24V voltage, the positive pole of diode D6 connect field effect transistor Q2 source electrode and receive connecting terminal P1 contact by resistance R 21.
Described DC/DC change-over circuit, the pin two of DC/DC boost converter U2 connects the 3V positive polarity, the pin 5 of DC/DC transducer U2 meets benchmark status GND by capacitor C 11, the pin 4 of DC/DC transducer U2, pin 6, pin 7 is connected to benchmark status GND, the pin one of DC/DC transducer U2 connects the grid of field effect transistor Q9, the source electrode of field effect transistor Q9 connects the pin 8 of DC/DC transducer U2 and an end of resistance R 26, the other end of resistance R 26 is connected to benchmark status GND, the drain electrode of field effect transistor Q9 connects an end of disappear special utmost point diode D3 positive pole and inductance L 6, another termination 6V positive polarity of inductance L 6, the negative pole connecting resistance R11 of special utmost point diode D3 disappears, capacitor C 10, courage electrochemical capacitor C13 positive pole, capacitor C 12, one end of resistance R 27, resistance R 27 the other ends are 24V voltage of voltage regulation end, the negative pole of courage electrochemical capacitor C13, another termination benchmark status GND of capacitor C 12, resistance R 11, the end of the other end connecting resistance R12 of capacitor C 10 and the pin 3 of DC/DC transducer U2, another termination benchmark status GND of resistance R 12; The pin one of DC/DC step-down controller U3, pin 3, one end of capacitor C 14 is connected to 6V voltage end positive pole, another termination benchmark status GND of capacitor C 14, the pin 4 of DC/DC step-down controller U3 meets benchmark status GND by capacitor C 25, the pin 5 of DC/DC step-down controller U3 connects the positive pole of courage electrochemical capacitor C19, one end of capacitor C 20, the negative pole of electricity courage solution capacitor C 19, another termination benchmark status GND of capacitor C 20, the pin 5 of DC/DC step-down controller U3 is the 3V voltage end, DC/DC step-down controller U3 pin two meets benchmark status GND, the pin one of DC/DC step-down controller U4 connects the 3V positive polarity, one end of capacitor C 15, the pin 3 of DC/DC step-down controller U4 connects an end of capacitor C 16, courage electrochemical capacitor C17 positive pole, the pin 3 of DC/DC step-down controller U4 is 2.5V voltage of voltage regulation end, capacitor C 15, the other end of capacitor C 16, courage electrochemical capacitor C17 negative pole, the pin two of DC/DC step-down controller U4 meets benchmark status GND.
Described operation push-button circuit, an end that touches key switch Key1, Key2, Key3 is connected to benchmark status GND, touch the end of the other end connecting resistance R9 of key switch Key1 and the general digital I/O pin two 2 of single-chip microcomputer U6, touch the end of the other end connecting resistance R8 of key switch Key2 and the general digital I/O pin two 1 of single-chip microcomputer U6, touch the end of the other end connecting resistance R7 of key switch Key3 and the general digital I/O pin two 0 of single-chip microcomputer U6, another termination 3V voltage of resistance R 9, resistance R 8, resistance R 7.
Described liquid crystal display circuit, No. 6 contact pins of liquid crystal display circuit connector assembly X4, No. 7 contact pins and connect after connect 3V voltage, No. 5 contact pins of connector assembly X4 meet benchmark status GND, No. 4 contact pins of connector assembly X4 connect the general digital I/O pin 47 of single-chip microcomputer U6, No. 3 contact pins of LCD connector assembly connect the general digital I/O pin 46 of single-chip microcomputer U6, No. 2 contact pins of connector assembly X4 connect the general digital I/O pin 45 of single-chip microcomputer U6, and No. 1 contact pin of X4 connector assembly connects the general digital I/O pin 44 of single-chip microcomputer U6.
A described circuit of giving instructions in reply is connected to: the pin one of reset circuit TC54 connects No. 7 contact pins of single-chip microcomputer U6 the RESET input 58 and connector assembly P0, and the pin two of reset circuit TC54 connects 3V voltage, and the pin 3 of reset circuit TC54 meets benchmark status GND.
The described warning circuit that shows, the general digital I/O pin one 7 of single-chip microcomputer U6, pin one 8, pin one 9 connects the pin two of NAND gate circuit U7A respectively, the pin 5 of NAND gate circuit U7B, the pin one 0 of NAND gate circuit U7C, the pin one of NAND gate circuit U7A, the pin 4 of NAND gate circuit U7B, the pin 9 of NAND gate circuit U7C and connect after connect the general digital I/O pin one 4 of single-chip microcomputer U6, the pin 3 of NAND gate circuit U7A joins with No. 6 contact pins of connector assembly X2, the pin 6 of NAND gate circuit U7B joins with No. 7 contact pins of connector assembly X2, the pin 8 of NAND gate circuit U7C joins with No. 8 contact pins of connector assembly X2, the general digital I/O pin one 6 of single-chip microcomputer U6 joins with No. 1 contact pin of connector assembly X2, the general digital I/O pin one 2 of single-chip microcomputer U6 joins with No. 4 contact pins of connector assembly X2 and connects 3V voltage by resistance R 6, connect No. 3 contact pins of connector assembly X2, No. 5 contact pin meets benchmark status GND, the pin one 2 of NAND gate circuit U7D, pin one 3 is connected to benchmark status GND, 11 pins of NAND gate circuit U7D are unsettled, and 14 pins of NAND gate circuit U7D connect 3V voltage; 7 pins meet benchmark status GND.
The described valve position drive circuit that shows, the general digital I/O pin one 5 of single-chip microcomputer U6 connects the pin 5 of not circuit U8C, the pin 6 of not circuit U8C, the pin one of NAND gate circuit U8A, the pin 3 of NAND gate circuit U8B, the pin 9 of NAND gate circuit U8D, the pin one 1 of NAND gate circuit U8E, the pin one 3 of NAND gate circuit U8F also connects together, the pin two of NAND gate circuit U8A, NAND gate circuit U8B pin 4, NAND gate circuit U8D pin 8, NAND gate circuit U8E pin one 0, NAND gate circuit U8F pin one 2 also connects together No. 2 contact pins of back and connector assembly X1, No. 4 contact pins, No. 6 contact pin joins, 14 pins of NAND gate circuit U8A connect 3V voltage, 7 pins meet benchmark status GND, No. 1 contact pin of connector assembly X1, No. 3 contact pins, No. 5 contact pin is connected to benchmark status GND.
The described crystal oscillating circuit that shows, the crystal resonator input pin 53 of single-chip microcomputer U6 connects an end of crystal oscillator CT and capacitor C 7, one end of another termination capacitor C 8 of capacitor C 7 and benchmark status GND, the other end of another termination crystal oscillator CT of capacitor C 8 and the crystal resonator input pin 52 of single-chip microcomputer U6.
The analog power pin 64 of described single-chip microcomputer U6 connects 3V voltage; The simulation of single-chip microcomputer U6 ground pin 62, digitally pin 63 meets benchmark status GND, the digital power end pin one of single-chip microcomputer U6 connects 3V voltage, the pin 7 of single-chip microcomputer U6 connects an end of capacitor C 6, the other end of capacitor C 6 meets pin one 1 and the benchmark status GND of single-chip microcomputer U6, and the pin one 0 of single-chip microcomputer U6 connects the 2.5V positive polarity.
The invention has the beneficial effects as follows: the eliminator of hardware circuit input end of the present invention is designed to chip magnetic bead and LC filtering, magnetic bead is selected large volume, ferrite chip magnetic bead, parameter is 100 Europe/100mMHZ, is mainly used in suppressing electromagnetic interference and the hot-tempered acoustic jamming of high frequency in the circuit.The closed inductance of B82793 digital signal that LC filtering, inductance have selected EPSONDE company to produce, the level of integration height, inhibition is good.Inductance is connected on circuit loop, is perfectly straight stream, and every interchange, lay particular emphasis on and suppress conductivity interference in the loop, and the medium and low frequency interference, remaining higher harmonics is fallen by capacitive bypass.Circuit has effectively suppressed High-frequency Interference, has well passed through the signal of useful direct current, has improved circuitry by interference.
The high-side signal of circuit signal control loop of the present invention detects amplification appliance, adopted the flash detection scheme, be to be placed on a high position between supply voltage and the load with detecting resistance, the pressure drop that forms at this resistance, adopt special-purpose flash current sense amplifier to amplify, this detection mode has not only been eliminated the ground wire that produces in the low frontier inspection survey scheme and has been disturbed, can also detect voltage to the accidental short circuit on circuit ground, compare with the traditional IC detecting amplifier have the measuring accuracy height, conversion rate is fast, the characteristics that amplifying power is strong, and can improve the anti-interference of circuit.
Circuit single-chip microcomputer of the present invention is the core of circuit, the MSP430F169 single-chip microcomputer that this circuit utilizes is the mixed-signal processor of 16 super low-power consumptions of company of Texas Instruments (TexasInstruments) production, super low-power consumption is the characteristic that other single-chip microcomputers do not have, this circuit is exactly to utilize this characteristic to reduce the power consumption of circuitry, it has low power supply voltage (voltage range 18V-36V) super low-power consumption, powerful Processing capacity, abundant chip peripheral module, system works is stable, the advantages such as function of convenient debugging are fit to be applied to the requirement of this circuit low power consumption.
The piezo electric valve control loop of circuit of the present invention, four road contactless electronic beam switch output driving circuits have been made up, every road has been designed two-stage and has been driven depletion field effect transistor, obtained bigger driving amplifying power, having selected the two-stage depletion field effect transistor is switching tube, has the input resistance height than traditional crystal switch pipe, noise factor is little, good thermal stability, conversion rate is fast, high frequency characteristics is good, it is a kind of voltage control device, can apply the negative bias reverse biased during work, also can add forward biased, therefore increase accommodation and the diversity of circuit design, also improved the reliability and stability of circuit.
The supply voltage circuit of circuit of the present invention, supply voltage obtains from the 4-20mA signal fully, voltage-stabiliser tube voltage stabilizing in the supply voltage, DC/DC transducer have been selected the integrated chip of low voltage power supply, super low-power consumption, be to be constituted by two-stage supply voltage circuit, prime is the voltage-stabiliser tube mu balanced circuit, the back level is the DC/DC change-over circuit, and signal converts the 6V voltage of direct-flow voltage regulation to through the voltage-stabiliser tube voltage stabilizing simultaneously by detecting resistance; Convert three kinds of supply voltages of circuits needed to by the DC/DC transducer again, the DC/DC boost converter, output DC24V voltage is supplied with the operating voltage of output driving circuit, the i.e. operation voltage of piezo electric valve; DC/DC step-down controller output DC3V voltage is supplied with the operating voltage of single-chip microcomputer, valve position drive circuit, warning drive circuit, reset circuit respectively; DC/DC step-down controller output DC2.5V voltage, the operating voltage of supply sensor change-over circuit.The DC/D transducer adopts independent integrated voltage stabilizing chip, has added a pair of decoupling capacitor in order to reduce power supply ripple at power output end, courage electrochemical capacitor lower pass-filter, and 0.1UF magnetic sheet electric capacity filters high order together with ripple, has protected the supply voltage global stability.
The reference potential of hardware circuit of the present invention has been created the integral ground mode, the benchmark earth potential of each functional circuit (GND-earth potential) is connected to same reference potential end, (GND-earth potential), and be connected with the reference potential of external control signal by tenminal block.The noise interference of having avoided ground loop to bring is improved circuit anti-interference, reliability.Be connected in series one 5 ohm Chip-R between the reference potential of circuit and the reference potential of external control signal, connecting this resistance is in order to protect the back polar circuit.
Circuit valve bit driver circuit of the present invention, designed the two-stage not circuit, a level not circuit in back has been created " line with " and has been connected, namely 5 not circuits are connected in parallel, the faint pulse signal that has played single-chip microcomputer output amplifies driving and shaping operation, the square signal that produces improved amplification and the driving force of circuit, and waveform carried out good shaping, so that can well be detected by external currrent feedback module and in aimed at precision.
Description of drawings
Fig. 1 is that circuit of the present invention connects block diagram;
Fig. 2 is circuit theory diagrams of the present invention;
Fig. 3 is circuit terminal wiring diagram of the present invention.
Embodiment
As shown in Figure 1, a kind of intelligent electric valve positioner motherboard hardware circuit, comprise SC sigmal control loop, sensor change-over circuit, single chip circuit, piezo electric valve control loop, supply voltage circuit, liquid crystal display circuit, operation push-button circuit, warning circuit, valve position drive circuit (currrent feedback is used), the SC sigmal control loop comprises that tenminal block P, eliminator, measuring resistor, high-side current detecting amplifier constitute.The sensor change-over circuit comprises that connector assembly X3, bleeder circuit constitute.Single chip circuit comprises that single-chip microcomputer, crystal oscillating circuit, reset circuit constitute.The piezo electric valve control circuit comprises that four output driving circuits, connecting terminal constitute.The supply voltage circuit comprises that voltage-stabiliser tube mu balanced circuit, DC/DC booster transducer, DC/DC step down transformer constitute.Liquid crystal display circuit comprises LCD MODULE, patches the link formation.The operation push-button circuit comprises bleeder circuit, touches the key switch formation.Warning circuit comprises that NAND gate circuit, connector assembly X2 constitute, and the valve position drive circuit comprises that not circuit, connector assembly X1 constitute.
By regulator or DCS, the given signal of the 4-20mA that PLC sends here is connected on the circuit board by tenminal block P, and successively through eliminator, the high-side current detecting amplifier converts voltage signal to, the valve mechanical displacement that while is fed back by external conductive plastic potentiometer RW, convert feedback voltage signal to through change-over circuit, more than two kinds of signals input to the A/D converting analogue input channel of single-chip microcomputer respectively, after the calculating of single-chip microcomputer to two kinds of deviation of signals and deviation variation rate, by fuzzy operation and the corresponding pulse signal of decision-making output, output pulse signal is through output driving circuit, connecting terminal is to piezo electric valve, the control piezo electric valve is connected, disconnect DC24V voltage, realized the unlatching of control piezo electric valve, the air inflow that enters the modulating valve air chamber with final control.The pulse signal of single-chip microcomputer output simultaneously shows the valve current location with percentage for the liquid crystal display modular.The given signal of 4-20mA has constituted a control show circuit.The supply voltage circuit is the operating voltage of supplying with each functional circuit.Operation push-button can be realized hand/conversion certainly, the action of manually-operable valve positioner, the function that program initialization and parameter are set.
Connector assembly X1 connects the currrent feedback module in the intelligent electric valve positioner motherboard hardware circuit as shown in Figure 3, be convenient to detect the valve pivotal position, connector assembly X2 connects alarm module, fault state for the prosecution valve, connector assembly X3 connects conductive plastic potentiometer RW, be convenient to the valve mechanical displacement and convert voltage signal to, tenminal block P connects regulator or DCS, the given signal of the 4-20mA that PIC sends here is to motherboard circuit, connecting terminal P1, P2, P3, P4 is used for connecting piezo electric valve, realize the unlatching of motherboard circuit control piezo electric valve, with the air inflow that final control enters the modulating valve air chamber, reach the purpose of regulating and controlling valve events.
The selection of detection resistance value R3 in the high-side signal detecting amplifier should be low as far as possible as shown in Figure 2, to keep power consumption controlled, but also want enough big, amplifier detects and the magnitude of voltage in aimed at precision so that generation can be detected, and selects 5 ohm of high-precision wafer resistance of 1/4W (0.1% precision) as calculated.Special-purpose high-side current detecting amplifier U1 has selected the MAX4372TESA that produces for U.S. letter company, this flash CSA have following characteristics: this chip has very high common mode input impedance, minimum input off-set voltage is lower than 1% precision index and the CMRR of typical 100dB.These characteristics provide the solution of high performance-price ratio for common problem among traditional flash CSA.And improved circuit measuring precision and transfer linearity degree, and its compact package (SO-8) makes the circuit board size be kept minimum, the little 25-6V of low power supply voltage, and super low-power consumption, thus realized the low requirement of attacking consumption of circuit.
The MSP430F169 single-chip microcomputer U6 that this circuit utilizes is the mixed-signal processor of 16 super low-power consumptions of TIX's production, single-chip microcomputer according to collect give determining voltage signal and the valve position feedback voltage signal compares, the unlatching of computing output pulse signal control system pressure valve, realize that control automatically follows the tracks of and locate.Inner integrated 2 the 16 bit timing devices of MSP430F169 single-chip microcomputer, 12 A/D converters of 1 high speed, 12 or 8 s' dual D/A converter, single-chip microcomputer utilizes AD to gather the voltage signal of high-side current detecting amplifier output, utilize AD to gather the feedback voltage signal of valve position sensor, two kinds of voltage signals that collect are handled the faint pulse signal of output through single-chip data, can control the unlatching of piezo electric valve by output driving circuit, with the air inflow that final control enters the modulating valve air chamber, regulate automatically and following function to realize valve.Single-chip microcomputer mainly is to make single-chip microcomputer can realize the function of data analysis and control circuit by programming.When system works, monolithic carries out the conversion of scale conversion and binary-coded decimal at machine to above two paths of signals, so that carry out the demonstration of the percentage of valve stroke at liquid crystal display.Realize automatic control and the demonstration of valve stroke.
The piezo electric valve control loop has made up four road contactless electronic beam switch output driving circuits, and every road has been designed two-stage CMOS and driven depletion field effect transistor, i.e. the Q1-Q8 field effect transistor.The faint pulse voltage signal of single-chip microcomputer output, control CMOS type field effect transistor is led, is ended, and connects, disconnects piezo electric valve with final control DC24V voltage.Finished system intelligence control purpose.
Voltage-stabiliser tube in the supply voltage circuit, DC/DC transducer design around low power consumption, high conversion accuracy.The BZV90C75V that 6V voltage-stabiliser tube D2 has selected PHILPS company to produce, have low in energy consumption, output voltage stabilization, output current is big, its compact package (SOT223) reduced size to circuit board.
The MAX1771 DC-DC transducer control chip that DC/DC boost converter U2 selects MAXIM (Maxin) company to produce; can be used for multiple multi-form DC-DC change-over circuit; have the characteristics of low power consumption and high switching frequency concurrently; running current is no more than 110 uA; power consumption can be reduced in the 5u A when entering outage state; device inside the is integrated in addition required functional unit of multiple DC-DC transducer; peripheral circuit is simple; be superior to traditional DC/DC switch technology, microminiature encapsulation (SO-8) has reduced size to circuit board.Control accuracy, stability, reliability that stable output adjustable voltage, High Output Current, super low-power consumption have improved complete machine have realized the requirement of low power consumption.
It is a kind of DC-DC transducer control chip that MAXIM (Maxin) company produces that DC/DC step-down controller U4 selects MAX6025AEUR-T, the output accuracy height, super low-power consumption, small-sized encapsulation, these characteristics provide the solution of high performance-price ratio for common problem in traditional DC-DC transducer.
By the trial-production to model machine, this circuit is feasible fully, and each phase technical order meets the demands, and reaches advanced international level.In a word the invention of this hardware circuit belong to domestic first.
Piezo electric valve control loop, the faint control signal that single-chip microcomputer is exported can pass through the unlatching of output driving circuit, connecting terminal control piezo electric valve, the air inflow that enters the modulating valve air chamber with final control.
Supply voltage comprises voltage-stabiliser tube mu balanced circuit, two-way DC/DC decompression converting circuit, one road DC/DC voltage up converting circuit, and the voltage of direct-flow voltage regulation of its output is supplied with the operating voltage of response function circuit respectively.
Claims (1)
1. intelligent electric valve positioner motherboard hardware circuit, it is characterized in that: comprise the SC sigmal control loop, the sensor change-over circuit, single chip circuit, the piezo electric valve control loop, the supply voltage circuit, liquid crystal display circuit, the operation push-button circuit, warning circuit, valve position drive circuit (currrent feedback is used), described single chip circuit respectively with the SC sigmal control loop, the sensor change-over circuit, the piezo electric valve control loop, liquid crystal display circuit, the operation push-button circuit, warning circuit, valve position drive circuit (currrent feedback is used) connects, and described supply voltage circuit is supplied with the SC sigmal control loop respectively, the sensor change-over circuit, single chip circuit, the piezo electric valve control loop, liquid crystal display circuit, the operation push-button circuit, warning circuit, the operating voltage of valve position drive circuit (currrent feedback is used); The SC sigmal control loop comprises tenminal block P, eliminator, measuring resistor, the high-side current detecting amplifier constitutes, the sensor change-over circuit comprises connector assembly X3, bleeder circuit constitutes, single chip circuit comprises single-chip microcomputer, crystal oscillating circuit, reset circuit constitutes, the piezo electric valve control circuit comprises four output driving circuits, connecting terminal constitutes, the supply voltage circuit comprises the voltage-stabiliser tube mu balanced circuit, DC/DC booster transducer, the DC/DC step down transformer constitutes, liquid crystal display circuit comprises LCD MODULE, patching link constitutes, the operation push-button circuit comprises bleeder circuit, touching key switch constitutes, warning circuit comprises NAND gate circuit, connector assembly X2 constitutes, and the valve position drive circuit comprises not circuit, connector assembly X1 constitutes;
Physical circuit is connected to: described SC sigmal control loop, the external 4-20mA signal of No. 2 terminals (signal both positive and negative polarity) of No. 1 terminal (signal positive pole) of tenminal block P and tenminal block P, 2 of tenminal block P, 3,4, No. 5 terminals also connect an end that meets magnetic bead L2 simultaneously, the pin two of another termination signal inductance L 5 of magnetic bead L2, the pin 4 of signal inductance L 5 connects an end of inductance L 4, the end of the other end connecting resistance R1 of inductance L 4, the end of the other end connecting resistance R2 of resistance R 1, the positive pole of transient protection diode D1 and voltage-stabiliser tube D2 also meets benchmark status GND, No. 1 terminal of tenminal block P connects the end of magnetic bead L1, the pin one of another termination signal inductance L 5 of magnetic bead L1, the pin 3 of signal inductance L 5 connects an end of inductance L 3, the other end connecting resistance R3 of inductance L 3, resistance R 4, the pin 8 of one end of capacitor C 1 and high-side current detecting amplifier U7, the other end of the other end connecting resistance R2 of capacitor C 1, resistance R 3, another termination transient protection diode D1 of resistance R 4, the pin 6 of the negative pole of voltage-stabiliser tube D2 and high-side current detecting amplifier U7, the negative pole of voltage-stabiliser tube D2 connects the positive pole of courage electrochemical capacitor C18, the negative pole of courage electrochemical capacitor C18 meets benchmark status GND, the negative pole of voltage-stabiliser tube D2 is 6V voltage of voltage regulation end, the pin one of high-side current detecting amplifier U7 connects 3V voltage, the pin 3 of high-side current detecting amplifier U7 meets benchmark status GND, the pin 4 connecting resistance R5 of high-side current detecting amplifier U7, one end of capacitor C 2, one end of resistance R 5 another termination capacitor C 21, the general digital I/O pin 3 of single-chip microcomputer U6, capacitor C 2, capacitor C 21 the other ends are connected to benchmark status GND;
Described sensor (leading a plastic potentiometer RW) change-over circuit, external conductive plastic potentiometer RW receives on the connector assembly X3, No. 1 contact pin of connector assembly X3, No. 2 contact pins and connect after connect an end and the 2.5V voltage of capacitor C 3, No. 3 contact pins of connector assembly X3 connect an end of the other end, capacitor C 4 and the resistance R 0 of capacitor C 3, No. 4 contact pins of connector assembly X3 meet the other end of capacitor C 4, an end and the benchmark status GND of capacitor C 5, the other end of the other end connecting resistance R0 of capacitor C 5 and single-chip microcomputer U6 general digital I/O pin 4;
Described piezo electric valve control loop, the end of the general digital I/O pin 38 connecting resistance R19 of single-chip microcomputer U6 and the grid of field effect transistor Q7, source electrode and the benchmark status GND of resistance R 19 another termination field effect transistor Q7, the grid of the end of the drain electrode connecting resistance R20 of field effect transistor Q7, the negative pole of diode D9 and effect pipe Q8, the drain electrode of another termination field effect transistor Q8 of resistance R 20 and the positive pole of 24V voltage, the positive pole of diode D9 connect the source electrode of field effect transistor Q8 and receive connecting terminal P4 contact by resistance R 24;
The end of the general digital I/O pin 39 connecting resistance R17 of single-chip microcomputer U6 and the grid of field effect transistor Q5, resistance R 17 another termination 3V voltages, the source electrode of field effect transistor Q5 meets benchmark status GND, the end of the drain electrode connecting resistance R18 of field effect transistor Q5, the negative pole of diode D8 and the grid of field effect transistor Q6, the drain electrode of another termination field effect transistor Q6 of resistance R 18 and the positive pole of 24V voltage, the positive pole of diode D8 connect field effect transistor Q6 source electrode and receive connecting terminal P3 contact by resistance R 22;
The end of the general digital I/O pin 40 connecting resistance R15 of single-chip microcomputer U6 and the grid of field effect transistor Q3, source electrode and the benchmark status GND of resistance R 15 another termination field effect transistor Q3, the end of the drain electrode connecting resistance R16 of field effect transistor Q3, the negative pole of diode D7 and the grid of field effect transistor Q4, the drain electrode of another termination field effect transistor Q4 of resistance R 16 and the positive pole of 24V voltage, the positive pole of diode D9 connect field effect transistor Q4 source electrode and receive connecting terminal P2 contact by resistance R 22;
The end of the general digital I/O pin 41 connecting resistance R13 of single-chip microcomputer U6 and the grid of field effect transistor Q1, resistance R 13 another termination 3V voltages, the source electrode of field effect transistor Q1 meets benchmark status GND, the grid of Q2 should be managed in the end of the drain electrode connecting resistance R14 of field effect transistor Q1, the negative pole of diode D6 and effect field, the drain electrode of another termination field effect transistor Q2 of resistance R 16 and the positive pole of 24V voltage, the positive pole of diode D6 connect field effect transistor Q2 source electrode and receive connecting terminal P1 contact by resistance R 21;
Described DC/DC change-over circuit, the pin two of DC/DC boost converter U2 connects the 3V positive polarity, the pin 5 of DC/DC transducer U2 meets benchmark status GND by capacitor C 11, the pin 4 of DC/DC transducer U2, pin 6, pin 7 is connected to benchmark status GND, the pin one of DC/DC transducer U2 connects the grid of field effect transistor Q9, the source electrode of field effect transistor Q9 connects the pin 8 of DC/DC transducer U2 and an end of resistance R 26, the other end of resistance R 26 is connected to benchmark status GND, the drain electrode of field effect transistor Q9 connects an end of disappear special utmost point diode D3 positive pole and inductance L 6, another termination 6V positive polarity of inductance L 6, the negative pole connecting resistance R11 of special utmost point diode D3 disappears, capacitor C 10, courage electrochemical capacitor C13 positive pole, capacitor C 12, one end of resistance R 27, resistance R 27 the other ends are 24V voltage of voltage regulation end, the negative pole of courage electrochemical capacitor C13, another termination benchmark status GND of capacitor C 12, resistance R 11, the end of the other end connecting resistance R12 of capacitor C 10 and the pin 3 of DC/DC transducer U2, another termination benchmark status GND of resistance R 12; The pin one of DC/DC step-down controller U3, pin 3, one end of capacitor C 14 is connected to 6V voltage end positive pole, another termination benchmark status GND of capacitor C 14, the pin 4 of DC/DC step-down controller U3 meets benchmark status GND by capacitor C 25, the pin 5 of DC/DC step-down controller U3 connects the positive pole of courage electrochemical capacitor C19, one end of capacitor C 20, the negative pole of electricity courage solution capacitor C 19, another termination benchmark status GND of capacitor C 20, the pin 5 of DC/DC step-down controller U3 is the 3V voltage end, DC/DC step-down controller U3 pin two meets benchmark status GND, the pin one of DC/DC step-down controller U4 connects the 3V positive polarity, one end of capacitor C 15, the pin 3 of DC/DC step-down controller U4 connects an end of capacitor C 16, courage electrochemical capacitor C17 positive pole, the pin 3 of DC/DC step-down controller U4 is 2.5V voltage of voltage regulation end, capacitor C 15, the other end of capacitor C 16, courage electrochemical capacitor C17 negative pole, the pin two of DC/DC step-down controller U4 meets benchmark status GND;
Described operation push-button circuit, an end that touches key switch Key1, Key2, Key3 is connected to benchmark status GND, touch the end of the other end connecting resistance R9 of key switch Key1 and the general digital I/O pin two 2 of single-chip microcomputer U6, touch the end of the other end connecting resistance R8 of key switch Key2 and the general digital I/O pin two 1 of single-chip microcomputer U6, touch the end of the other end connecting resistance R7 of key switch Key3 and the general digital I/O pin two 0 of single-chip microcomputer U6, another termination 3V voltage of resistance R 9, resistance R 8, resistance R 7;
Described liquid crystal display circuit, No. 6 contact pins of liquid crystal display circuit connector assembly X4, No. 7 contact pins and connect after connect 3V voltage, No. 5 contact pins of connector assembly X4 meet benchmark status GND, No. 4 contact pins of connector assembly X4 connect the general digital I/O pin 47 of single-chip microcomputer U6, No. 3 contact pins of LCD connector assembly connect the general digital I/O pin 46 of single-chip microcomputer U6, No. 2 contact pins of connector assembly X4 connect the general digital I/O pin 45 of single-chip microcomputer U6, and No. 1 contact pin of X4 connector assembly connects the general digital I/O pin 44 of single-chip microcomputer U6;
A described circuit of giving instructions in reply is connected to: the pin one of reset circuit TC54 connects No. 7 contact pins of single-chip microcomputer U6 the RESET input 58 and connector assembly P0, and the pin two of reset circuit TC54 connects 3V voltage, and the pin 3 of reset circuit TC54 meets benchmark status GND;
The described warning circuit that shows, the general digital I/O pin one 7 of single-chip microcomputer U6, pin one 8, pin one 9 connects the pin two of NAND gate circuit U7A respectively, the pin 5 of NAND gate circuit U7B, the pin one 0 of NAND gate circuit U7C, the pin one of NAND gate circuit U7A, the pin 4 of NAND gate circuit U7B, the pin 9 of NAND gate circuit U7C and connect after connect the general digital I/O pin one 4 of single-chip microcomputer U6, the pin 3 of NAND gate circuit U7A joins with No. 6 contact pins of connector assembly X2, the pin 6 of NAND gate circuit U7B joins with No. 7 contact pins of connector assembly X2, the pin 8 of NAND gate circuit U7C joins with No. 8 contact pins of connector assembly X2, the general digital I/O pin one 6 of single-chip microcomputer U6 joins with No. 1 contact pin of connector assembly X2, the general digital I/O pin one 2 of single-chip microcomputer U6 joins with No. 4 contact pins of connector assembly X2 and connects 3V voltage by resistance R 6, connect No. 3 contact pins of connector assembly X2, No. 5 contact pin meets benchmark status GND, the pin one 2 of NAND gate circuit U7D, pin one 3 is connected to benchmark status GND, 11 pins of NAND gate circuit U7D are unsettled, and 14 pins of NAND gate circuit U7D connect 3V voltage; 7 pins meet benchmark status GND;
The described valve position drive circuit that shows, the general digital I/O pin one 5 of single-chip microcomputer U6 connects the pin 5 of not circuit U8C, the pin 6 of not circuit U8C, the pin one of NAND gate circuit U8A, the pin 3 of NAND gate circuit U8B, the pin 9 of NAND gate circuit U8D, the pin one 1 of NAND gate circuit U8E, the pin one 3 of NAND gate circuit U8F also connects together, the pin two of NAND gate circuit U8A, NAND gate circuit U8B pin 4, NAND gate circuit U8D pin 8, NAND gate circuit U8E pin one 0, NAND gate circuit U8F pin one 2 also connects together No. 2 contact pins of back and connector assembly X1, No. 4 contact pins, No. 6 contact pin joins, 14 pins of NAND gate circuit U8A connect 3V voltage, 7 pins meet benchmark status GND, No. 1 contact pin of connector assembly X1, No. 3 contact pins, No. 5 contact pin is connected to benchmark status GND;
The described crystal oscillating circuit that shows, the crystal resonator input pin 53 of single-chip microcomputer U6 connects an end of crystal oscillator CT and capacitor C 7, one end of another termination capacitor C 8 of capacitor C 7 and benchmark status GND, the other end of another termination crystal oscillator CT of capacitor C 8 and the crystal resonator input pin 52 of single-chip microcomputer U6;
The analog power pin 64 of described single-chip microcomputer U6 connects 3V voltage; The simulation of single-chip microcomputer U6 ground pin 62, digitally pin 63 meets benchmark status GND, the digital power end pin one of single-chip microcomputer U6 connects 3V voltage, the pin 7 of single-chip microcomputer U6 connects an end of capacitor C 6, the other end of capacitor C 6 meets pin one 1 and the benchmark status GND of single-chip microcomputer U6, and the pin one 0 of single-chip microcomputer U6 connects the 2.5V positive polarity.
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| CN109597430A (en) * | 2019-01-18 | 2019-04-09 | 东北农业大学 | The UAV system of dimension analysis is risen based on photo |
| CN113790304A (en) * | 2021-08-23 | 2021-12-14 | 浙江中控技术股份有限公司 | Intrinsic safety HART communication system for intelligent valve positioner |
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| CN106763978B (en) * | 2016-12-28 | 2022-11-11 | 浙江富春江环保科技研究有限公司 | Multi-trigger-mode high-speed pulse valve driver |
| CN108180307B (en) * | 2017-12-29 | 2019-11-22 | 武汉拓优智能股份有限公司 | Passive angle pedestal valve |
| CN108180307A (en) * | 2017-12-29 | 2018-06-19 | 武汉拓优智能股份有限公司 | Passive angle pedestal valve |
| CN109597430A (en) * | 2019-01-18 | 2019-04-09 | 东北农业大学 | The UAV system of dimension analysis is risen based on photo |
| CN109597430B (en) * | 2019-01-18 | 2023-04-18 | 东北农业大学 | Unmanned aerial vehicle system based on photo dimension-rising analysis |
| CN113790304A (en) * | 2021-08-23 | 2021-12-14 | 浙江中控技术股份有限公司 | Intrinsic safety HART communication system for intelligent valve positioner |
| CN113790304B (en) * | 2021-08-23 | 2023-11-14 | 浙江中控技术股份有限公司 | Intrinsic safety HART communication system for intelligent valve positioner |
| CN116107258A (en) * | 2023-03-02 | 2023-05-12 | 杭州电子科技大学 | A two-wire piezoelectric pneumatic valve positioner circuit based on STM32L1 |
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