CN104931722B - A kind of measuring circuit of drainage pipeline networks flow velocity - Google Patents

A kind of measuring circuit of drainage pipeline networks flow velocity Download PDF

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Publication number
CN104931722B
CN104931722B CN201510310544.2A CN201510310544A CN104931722B CN 104931722 B CN104931722 B CN 104931722B CN 201510310544 A CN201510310544 A CN 201510310544A CN 104931722 B CN104931722 B CN 104931722B
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pin
circuit
filter capacitor
filter
resistance
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CN104931722A (en
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薛安克
徐雍
邹洪波
鲁仁全
柏建军
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Hangzhou Dianzi University
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Hangzhou Dianzi University
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Abstract

The invention discloses a kind of measuring circuit of drainage pipeline networks flow velocity, the present invention includes RAM plate basic circuits part, signal generating circuit part and signal output apparatus part.Described RAM plate basic circuits part includes CPU, power module of voltage regulation circuit, voltage filter modular circuit, voltage transformation module circuit, serial ports download modular circuit, clock module circuit, debugging module circuit, starting module circuit and CAN transceiver module circuits;Signal generating circuit mainly includes voltage-stabilized power supply circuit, square wave generation circuit, sine wave generating circuit, filter circuit and amplifying circuit.Signal output apparatus part includes instrument amplifier modular circuit, absolute value block circuit, output voltage filtration module circuit.Circuit design of the present invention is simple, cost-effective, and real-time Communication for Power can be achieved, and practical value is obvious.

Description

A kind of measuring circuit of drainage pipeline networks flow velocity
Technical field
The invention belongs to technical field of industrial control, is related to a kind of circuit, and in particular to a kind of drainage pipeline networks flow rate detection The circuit of device.
Background technology
The step of rural urbanization is more and more faster, and urban development is also advanced by leaps and bounds, and incident municipal drainage problem is As one of outstanding problem for restricting rapid urban.New city drainage system mainly for the existing pumping equipment in city, By drainage system pipe net leakage rate and Real-time Monitoring Data, the operation of global optimization drainage system, improve the comprehensive of pumping plant network and transport It is line efficiency, energy-saving, improve pre- flood, the flood control capacity in city.Therefore, the detection means of drainage pipeline networks is highly important, The detection means of flow rate of liquid particularly in pipe network.
The content of the invention
The purpose of the present invention is imperfect aiming at draining field correlation technique, there is provided it is a kind of it is reliable, stable, The circuit for the drainage pipeline networks flow monitor that can be communicated.
To realize object above, the technical solution adopted by the present invention is:
A kind of measuring circuit of drainage pipeline networks flow velocity, including RAM plate basic circuits part, signal generating circuit part and letter Number output circuit part.
RAM plate basic circuits part includes CPU, power module of voltage regulation circuit, voltage filter modular circuit, voltage conversion mould Block circuit, serial ports download modular circuit, clock module circuit, debugging module circuit, starting module circuit and CAN transmitting-receiving mould Block circuit;Described CPU uses STM32F103Rc chips;
The power module of voltage regulation circuit includes five electric capacity.Wherein the first filter capacitor C7 one end, the second filtered electrical Hold C8 one end, the 3rd filter capacitor C9 one end, the 4th filter capacitor C10 one end, the 5th filter capacitor C11 one end all It is connected with power supply VCC ends, the other end of five filter capacitors is all grounded.
The voltage filter module includes two electric capacity.Wherein the 6th filter capacitor C14 one end, the 7th filter capacitor C13 one end is all connected with analog power AVCC one end and connects CPU 13 pin, and the other end of two filter capacitors is all grounded Simulation ground AGND.
The voltage transformation module includes two electric capacity.Wherein the 8th filter capacitor C15 one end and CPU 47 pin connect Connect, other end ground connection.9th filter capacitor C16 one end and CPU 31 pin connect, other end ground connection.
The serial ports module that downloads includes three resistance and an electric capacity.First divider resistance R5 one end and second Divider resistance R7 one end, the 3rd divider resistance R8 connections.First divider resistance R5 another termination power VCC, the second partial pressure The resistance R7 other end and CPU pin 60 connect.First storage capacitor C12 one end is connected with CPU NRST interfaces, another End is connected and is grounded with the 3rd divider resistance R8 other end.
The clock module includes a crystal oscillator and two electric capacity;First crystal oscillator Y1 one end is with the second storage capacitor C1's One end connects, and is connected with CPU pin 6;The first crystal oscillator Y1 other end is connected with the 3rd storage capacitor C2 one end, and with CPU pin 5 connects.The second storage capacitor C1 other end, the 3rd storage capacitor C2 other end ground connection.
The debugging module includes a light emitting diode and a resistance.4th divider resistance R6 one end and CPU's PA15/JTDI pins are connected, and the other end is connected with light emitting diode DS1 positive pole, light emitting diode DS1 negative pole ground connection.
The starting module includes a resistance.First pull-up resistor R9 one end and CPU pin 28 connect, the other end Ground connection.
The CAN transceiver modules integrate including four resistance, four electric capacity, four Transient Suppression Diodes and CAN interface Chip U1;CAN interface integrated chip U1 model SN65HVD1050;First Transient Suppression Diode TVS1 anode, second Transient Suppression Diode TVS2 anode, the 3rd Transient Suppression Diode TVS3 anode, the 4th Transient Suppression Diode TVS4 Anode be connected with the positive pole of cross thermocouple.First Transient Suppression Diode TVS1 negative electrode, the second Transient Suppression Diode TVS2 negative electrode is connected with CAN interface integrated chip U1 7 pin.3rd Transient Suppression Diode TVS3 negative electrode, the 4th transient state The negative electrode for suppressing diode TVS4 is connected with CAN interface integrated chip U1 6 pin.CAN interface integrated chip U1 4 pin and second Pull-up resistor R1 one end connection, CAN interface integrated chip U1 1 pin is connected with the 3rd pull-up resistor R2 one end, on second The pull-up resistor R1 other end and the 3rd pull-up resistor the R2 other end, the 22nd filter capacitor C5 one end, the tenth filter capacitor C6 one end and CAN interface integrated chip U1 pin 3 connect and connect+5V power supplys.The 22nd filter capacitor C5 other ends, The tenth filter capacitor C6 other end and CAN interface integrated chip U1 pin 2 are connected and are grounded, CAN interface integrated chip U1 pin 5 is connected with the 11st filter capacitor C4 one end, the 11st filter capacitor C4 other end ground connection, CAN interface collection Pin 8 into chip U1 is hanging;
Described CPU 12 pin connect digitally, and CPU 18 pin ground connection, 19 pin, 64 pin, 48 pin, 32 pin meet VCC;CPU exists Pin not mentioned herein is all aerial;
7 pin with CAN interface integrated chip U1,6 pin are connected connector RJ1 4 pin, 5 pin successively, 1 pin, 2 pin, 3 pin, 6 Pin, 7 pin, 8 pin ground connection;7 pin with CAN interface integrated chip U1,6 pin are connected connector RJ2 4 pin, 5 pin successively, 1 pin, 2 Pin, 3 pin, 6 pin, 7 pin, 8 pin ground connection;Connector P_CANH1 1 pin is connected with CAN interface integrated chip U1 7 pin, 2 pin and Four pull-up resistor R3 one end connection, connector P_CANL1 2 pin are connected with CAN interface integrated chip U1 6 pin, 1 pin and the Five pull-up resistor R4 one end connection, the 4th pull-up resistor R3 other end and the 5th pull-up resistor R4 other end, the 20th Eight filter capacitor C3 one end connection, the 28th filter capacitor C3 other end ground connection;
In addition with externally fed interface JP1, pin 1 meets power supply VCC, and pin 2 meets analog power AVCC, and pin 3 connects VEE, pin 4 are grounded.Power supply interface JP2, pin 1 meet power supply VCC, and pin 2 connects CPU pin 46, and pin 3 connects CPU pin 49, pin 4 is grounded.
Signal generating circuit includes voltage-stabilized power supply circuit, square wave generation circuit, sine wave generating circuit, filter circuit and put Big circuit.
The voltage-stabilized power supply circuit includes two electric capacity.12nd filter capacitor C24 one end and the 13rd filter capacitor A C25 termination power VCC, the 12nd filter capacitor C24 and the 13rd filter capacitor C25 other end ground connection;
Side's wave generation circuit includes one without source crystal oscillator and an electric capacity.14th filter capacitor C33 one end with And 4 pin without source crystal oscillator X17 meet power supply VCC, the 14th filter capacitor C33 other end and crystal oscillator X17 pin 2 are grounded, Pin 1 without source crystal oscillator X17 is hanging.
The sine wave generating circuit includes a 9833 chip U10, two electric capacity.The one of 15th filter capacitor C23 End be connected with 9833 chip U10 pin 1, the 15th filter capacitor C23 other end and 9833 chip U10 pin 2 and Power supply VCC connections.16th filter capacitor C30 one end is connected with 9833 chip U10 pin 3, the 16th filter capacitor C30 The other end and 9833 chip U10 pin 4 be grounded;9833 chip U10 pin 5 connects with the pin 3 without source crystal oscillator X17 Connect.9833 chip U10 9 pin ground connection.9833 chip U10 pin 6, pin 7, pin 8 pin 36, the pin with CPU successively 34th, pin 33 connects.
First filter circuit includes two resistance, six electric capacity and two inductance.First filter resistance R30 one end One end, 9833 chip U10 pin 10 with the 17th filter capacitor C32 are connected.The first filter resistance R30 other end and 17 filter capacitor C32 other end ground connection.18th filter capacitor C27 one end and the 19th filter capacitor C28 one end, 20th filter capacitor C31 one end, one end connection of the first filter inductance L17 one end, the second filter inductance L18, the tenth The eight filter capacitor C27 other end is connected with the first filter inductance L17 other end, 9833 chip U10 pin 10.Second filter The ripple inductance L18 other end and the 19th filter capacitor C28 other end, the 21st filter capacitor C29 one end, the second filter Ripple resistance R29 one end, the first coupled capacitor C26 one end connection.The 20th filter capacitor C31 other end, the 21st The other end ground connection of the filter capacitor C29 other end, the second filter resistance R29.
The amplifying circuit includes two resistance, an electric capacity, an operational amplifier;The type of described operational amplifier Number it is EL5100W;
Operational amplifier P19 output end O pins and the 3rd filter resistance R27 of lead compensation circuit and lead compensation electricity The 27th filter capacitor C22 on road one end is connected, the 3rd filter resistance R27 of the lead compensation circuit other end and advanced 27th filter capacitor C22 of the compensation circuit other end, the 4th filter resistance R28 of lead compensation circuit one end, fortune The backward end IN- for calculating amplifier P19 is connected.Operational amplifier P19 end IN+ in the same direction is connected with the first coupled capacitor C26.In advance The 4th filter resistance R28 other end of compensation circuit is connected and is grounded with operational amplifier P19 EN pins.Operational amplifier P19 V+ pins meet power supply VCC, and operational amplifier P19 V- pins meet power supply VEE.Operational amplifier P19 output end O with Socket P18 1 port is connected, and P18 another port 2 is grounded.
Signal output apparatus part includes instrument amplifier modular circuit, absolute value block circuit, output voltage filtering mould Block circuit.
The instrument amplifier part includes inserting for two electric capacity, a resistance, an instrument amplifier and 2 port Seat.Two RG pins of instrument amplifier are connected with gain setting resistor R18 both ends, Vin- pins and socket P17 1 port It is connected, Vin+ pins are connected with socket P17 2 ports, and one end of V- pins and power supply VEE, the 23rd filter capacitor C18 connects Connecing, Ref pins ground connection, Vo pins are connected with the 5th divider resistance R26 of absolute value block, the 6th divider resistance R25 one end, V+ pins are connected with power supply VCC, the 24th filter capacitor C17 one end.23rd filter capacitor C18 another termination Ground.24th filter capacitor C17 other end ground connection.
The absolute value circuit includes 6 resistance, two operational amplifiers, two diodes.First operational amplifier and The model LM258D of second operational amplifier;First operational amplifier U17A inverting input and the first pull down resistor R20 One end, the first diode D17 negative pole, the 7th divider resistance R17 one end be connected, normal phase input end and the 5th divider resistance The R26 other end is connected, and output end is connected with diode D17 positive pole, the second diode D18 negative pole.Second operation amplifier Device U17B inverting input is connected with the 8th divider resistance R21, the 9th piezoresistance R19 one end, normal phase input end and the 6th Divider resistance R25 one end is connected, output end and the tenth partial pressure in the 9th divider resistance the R19 other end and filter circuit Resistance R24 is connected.First pull down resistor R20 other end ground connection.The 7th divider resistance R17 other end, the 8th divider resistance The R21 other end and the second diode D18 positive pole are connected.
Second filter circuit includes three resistance, three electric capacity.The tenth divider resistance R24 other end and the 12nd Divider resistance R23 one end, the 25th filter capacitor C21 one end are connected.The 12nd divider resistance R23 other end and 13 divider resistance R22 one end, the 28th filter capacitor C20 one end is connected.The 13rd divider resistance R22 other end It is connected with the 3rd filter capacitor C19 one end and connects CPU AD123IN0 interfaces.The 25th filter capacitor C21 other end, The 28th filter capacitor C20 other end, the 26th filter capacitor C19 other end is all grounded.
Beneficial effect:
The circuit of drainage pipeline networks flow monitor through practice examining, can it is effectively measuring go out drainage network velocity in pipes it is corresponding Magnitude of voltage, so as to be converted into corresponding flow velocity, its error is in insignificant scope.The electricity of drainage pipeline networks flow monitor Road, it can be used in drainage pipeline networks monitoring system, its circuit design is simple, cost-effective, and real-time Communication for Power, practical value can be achieved Substantially.
Brief description of the drawings
Fig. 1 is CPU, power module of voltage regulation circuit, voltage filter module electricity in the RAM plate basic circuits part of the present invention Road, voltage transformation module circuit, serial ports download modular circuit, clock module circuit, debugging module circuit and starting module Circuit part;
Fig. 2 is the CAN transceiver module circuit parts in the RAM plate basic circuits part of invention;
Fig. 3 is power supply interface JP1 figures;
Fig. 4 is power supply interface JP2 figures;
Fig. 5 signal generating circuits part;
Fig. 6 is signal output apparatus part.
Embodiment
With reference to schematic diagram and concrete operations implementation, the invention will be further described, to help the scientific research of association area Worker has a more deep understanding to the thought of the present invention.
Such as Fig. 1, a kind of measuring circuit of drainage pipeline networks flow velocity, including RAM plate basic circuits part, signal generating circuit portion Divide and signal output apparatus part.
RAM plate basic circuits part includes CPU, power module of voltage regulation circuit, voltage filter modular circuit, voltage conversion mould Block circuit, serial ports download modular circuit, clock module circuit, debugging module circuit, starting module circuit and CAN transmitting-receiving mould Block circuit;Described CPU uses STM32F103Rc chips;
The power module of voltage regulation circuit includes five electric capacity.Wherein the first filter capacitor C7 one end, the second filtered electrical Hold C8 one end, the 3rd filter capacitor C9 one end, the 4th filter capacitor C10 one end, the 5th filter capacitor C11 one end all It is connected with power supply VCC ends, the other end of five filter capacitors is all grounded.
The voltage filter module includes two electric capacity.Wherein the 6th filter capacitor C14 one end, the 7th filter capacitor C13 one end is all connected with analog power AVCC one end and connects CPU 13 pin, and the other end of two filter capacitors is all grounded Simulation ground AGND.
The voltage transformation module includes two electric capacity.Wherein the 8th filter capacitor C15 one end and CPU 47 pin connect Connect, other end ground connection.9th filter capacitor C16 one end and CPU 31 pin connect, other end ground connection.
The serial ports module that downloads includes three resistance and an electric capacity.First divider resistance R5 one end and second Divider resistance R7 one end, the 3rd divider resistance R8 connections.First divider resistance R5 another termination power VCC, the second partial pressure The resistance R7 other end and CPU pin 60 connect.First storage capacitor C12 one end is connected with CPU NRST interfaces, another End is connected and is grounded with the 3rd divider resistance R8 other end.
The clock module includes a crystal oscillator and two electric capacity;First crystal oscillator Y1 one end is with the second storage capacitor C1's One end connects, and is connected with CPU pin 6;The first crystal oscillator Y1 other end is connected with the 3rd storage capacitor C2 one end, and with CPU pin 5 connects.The second storage capacitor C1 other end, the 3rd storage capacitor C2 other end ground connection.
The debugging module includes a light emitting diode and a resistance.4th divider resistance R6 one end and CPU's PA15/JTDI pins are connected, and the other end is connected with light emitting diode DS1 positive pole, light emitting diode DS1 negative pole ground connection.
The starting module includes a resistance.First pull-up resistor R9 one end and CPU pin 28 connect, the other end Ground connection.
As described in Figure 2, the CAN transceiver modules include four resistance, four electric capacity, four Transient Suppression Diodes and CAN interface integrated chip U1;CAN interface integrated chip U1 model SN65HVD1050;First Transient Suppression Diode TVS1 Anode, the second Transient Suppression Diode TVS2 anode, the 3rd Transient Suppression Diode TVS3 anode, the 4th transient state suppress Diode TVS4 anode is connected with the positive pole of cross thermocouple.First Transient Suppression Diode TVS1 negative electrode, the second transient state The negative electrode for suppressing diode TVS2 is connected with CAN interface integrated chip U1 7 pin.3rd Transient Suppression Diode TVS3 the moon Pole, the 4th Transient Suppression Diode TVS4 negative electrode are connected with CAN interface integrated chip U1 6 pin.CAN interface integrated chip U1 4 pin be connected with the second pull-up resistor R1 one end, CAN interface integrated chip U1 1 pin and the 3rd pull-up resistor R2 one end Connection, the second pull-up resistor R1 other end and the 3rd pull-up resistor R2 other end, the 22nd filter capacitor C5 one end, the Ten filter capacitor C6 one end and CAN interface integrated chip U1 pin 3 connect and connect+5V power supplys.22nd filtered electrical Hold the C5 other ends, the tenth filter capacitor C6 other end and CAN interface integrated chip U1 pin 2 to connect and be grounded, CAN connects Mouth integrated chip U1 pin 5 is connected with the 11st filter capacitor C4 one end, the 11st filter capacitor C4 other end ground connection, CAN interface integrated chip U1 pin 8 is hanging;
Described CPU 12 pin connect digitally, and CPU 18 pin, 67 pin connect digitally, and 19 pin, 64 pin, 48 pin, 32 pin connect VCC;The pin that CPU is not mentioned herein is all aerial;
As shown in Fig. 27 pin with CAN interface integrated chip U1,6 pin are connected successively for connector RJ1 4 pin, 5 pin, 1 pin, 2 pin, 3 pin, 6 pin, 7 pin, 8 pin ground connection;7 pin with CAN interface integrated chip U1,6 pin connect connector RJ2 4 pin, 5 pin successively Connect, 1 pin, 2 pin, 3 pin, 6 pin, 7 pin, 8 pin ground connection;Connector P_CANH1 1 pin connects with CAN interface integrated chip U1 7 pin Connect, 2 pin are connected with the 4th pull-up resistor R3 one end, and connector P_CANL1 2 pin connect with CAN interface integrated chip U1 6 pin Connect, 1 pin is connected with the 5th pull-up resistor R4 one end, and the 4th pull-up resistor R3 other end is another with the 5th pull-up resistor R4's End, the 28th filter capacitor C3 one end connection, the 28th filter capacitor C3 other end ground connection;
Such as Fig. 3 and as shown in figure 4, in addition with externally fed interface JP1, pin 1 meets power supply VCC, and pin 2 connects simulation electricity Source AVCC, pin 3 meet VEE, and pin 4 is grounded.Power supply interface JP2, pin 1 meet power supply VCC, and pin 2 connects CPU pin 46, pipe Pin 3 connects CPU pin 49, and pin 4 is grounded.
As shown in figure 5, signal generating circuit includes voltage-stabilized power supply circuit, square wave generation circuit, sine wave generating circuit, filter Wave circuit and amplifying circuit.
The voltage-stabilized power supply circuit includes two electric capacity.12nd filter capacitor C24 one end and the 13rd filter capacitor A C25 termination power VCC, the 12nd filter capacitor C24 and the 13rd filter capacitor C25 other end ground connection;
Side's wave generation circuit includes one without source crystal oscillator and an electric capacity.14th filter capacitor C33 one end with And 4 pin without source crystal oscillator X17 meet power supply VCC, the 14th filter capacitor C33 other end and crystal oscillator X17 pin 2 are grounded, Pin 1 without source crystal oscillator X17 is hanging.
The sine wave generating circuit includes a 9833 chip U10, two electric capacity.The one of 15th filter capacitor C23 End be connected with 9833 chip U10 pin 1, the 15th filter capacitor C23 other end and 9833 chip U10 pin 2 and Power supply VCC connections.16th filter capacitor C30 one end is connected with 9833 chip U10 pin 3, the 16th filter capacitor C30 The other end and 9833 chip U10 pin 4 be grounded;9833 chip U10 pin 5 connects with the pin 3 without source crystal oscillator X17 Connect.9833 chip U10 9 pin ground connection.9833 chip U10 pin 6, pin 7, pin 8 pin 36, the pin with CPU successively 34th, pin 33 connects.
First filter circuit includes two resistance, six electric capacity and two inductance.First filter resistance R30 one end One end, 9833 chip U10 pin 10 with the 17th filter capacitor C32 are connected.The first filter resistance R30 other end and 17 filter capacitor C32 other end ground connection.18th filter capacitor C27 one end and the 19th filter capacitor C28 one end, 20th filter capacitor C31 one end, one end connection of the first filter inductance L17 one end, the second filter inductance L18, the tenth The eight filter capacitor C27 other end is connected with the first filter inductance L17 other end, 9833 chip U10 pin 10.Second filter The ripple inductance L18 other end and the 19th filter capacitor C28 other end, the 21st filter capacitor C29 one end, the second filter Ripple resistance R29 one end, the first coupled capacitor C26 one end connection.The 20th filter capacitor C31 other end, the 21st The other end ground connection of the filter capacitor C29 other end, the second filter resistance R29.
The amplifying circuit includes two resistance, an electric capacity, an operational amplifier;The type of described operational amplifier Number it is EL5100W;
Operational amplifier P19 output end O pins and the 3rd filter resistance R27 of lead compensation circuit and lead compensation electricity The 27th filter capacitor C22 on road one end is connected, the 3rd filter resistance R27 of the lead compensation circuit other end and advanced 27th filter capacitor C22 of the compensation circuit other end, the 4th filter resistance R28 of lead compensation circuit one end, fortune The backward end IN- for calculating amplifier P19 is connected.Operational amplifier P19 end IN+ in the same direction is connected with the first coupled capacitor C26.In advance The 4th filter resistance R28 other end of compensation circuit is connected and is grounded with operational amplifier P19 EN pins.Operational amplifier P19 V+ pins meet power supply VCC, and operational amplifier P19 V- pins meet power supply VEE.Operational amplifier P19 output end O with Socket P18 1 port is connected, and P18 another port 2 is grounded.
As shown in fig. 6, signal output apparatus part includes instrument amplifier modular circuit, absolute value block circuit, output Voltage filter modular circuit.
The instrument amplifier part includes inserting for two electric capacity, a resistance, an instrument amplifier and 2 port Seat.Two RG pins of instrument amplifier are connected with gain setting resistor R18 both ends, Vin- pins and socket P17 1 port It is connected, Vin+ pins are connected with socket P17 2 ports, and one end of V- pins and power supply VEE, the 23rd filter capacitor C18 connects Connecing, Ref pins ground connection, Vo pins are connected with the 5th divider resistance R26 of absolute value block, the 6th divider resistance R25 one end, V+ pins are connected with power supply VCC, the 24th filter capacitor C17 one end.23rd filter capacitor C18 another termination Ground.24th filter capacitor C17 other end ground connection.
The absolute value circuit includes 6 resistance, two operational amplifiers, two diodes.First operational amplifier and The model LM258D of second operational amplifier;First operational amplifier U17A inverting input and the first pull down resistor R20 One end, the first diode D17 negative pole, the 7th divider resistance R17 one end be connected, normal phase input end and the 5th divider resistance The R26 other end is connected, and output end is connected with diode D17 positive pole, the second diode D18 negative pole.Second operation amplifier Device U17B inverting input is connected with the 8th divider resistance R21, the 9th piezoresistance R19 one end, normal phase input end and the 6th Divider resistance R25 one end is connected, output end and the tenth partial pressure in the 9th divider resistance the R19 other end and filter circuit Resistance R24 is connected.First pull down resistor R20 other end ground connection.The 7th divider resistance R17 other end, the 8th divider resistance The R21 other end and the second diode D18 positive pole are connected.
Second filter circuit includes three resistance, three electric capacity.The tenth divider resistance R24 other end and the 12nd Divider resistance R23 one end, the 25th filter capacitor C21 one end are connected.The 12nd divider resistance R23 other end and 13 divider resistance R22 one end, the 28th filter capacitor C20 one end is connected.The 13rd divider resistance R22 other end It is connected with the 26th filter capacitor C19 one end and connects CPU AD123IN0 interfaces.25th filter capacitor C21's is another One end, the 28th filter capacitor C20 other end, the 26th filter capacitor C19 other end are all grounded.
STM32F103Rc in the RAM plates basic circuit is a 32 single-chip microcomputers of ST Microelectronics, is possessed CAN transmission-receiving function, excellent performance, reasonable price, fully meet the needs in drainage pipelines net project field.The AD9833 It is a low-power consumption of ADI companies production, programmable waveform generator, sine wave, triangular wave, square wave output can be produced, it is defeated Going out frequency and phase can be programmed by software, and adjustment is simple.The operational amplifier P19 is Intersil companies EL5100.The instrument amplifier is the INA170EA/250 chips of TI companies.The first, second of the absolute value circuit part Operational amplifier is the low consumed power operational amplifier integrated chip LM258D with STC Corporation, its stable performance, meets every want Ask.
The course of work:
1,2 ports output of the sine wave signal through P18 as caused by signal generating circuit, as measurement point in drainpipe two The both positive and negative polarity of lateral coil.Respectively there is mobilizable metal bar in two coils, one end of metal bar is fastened on tube wall with spring On, the other end is attached on same baffle plate jointly.When baffle plate is moved through water impact, position can also occur for metal bar Move, so as to cause the left and right sides at coil half to produce pressure difference.The wire difference drawn at two lateral coil halfs P17 1,2 ports are connected, and as the input signal of output circuit, through instrument amplifier amplified signal, absolute value circuit is won the confidence Number absolute value, and filtered circuit is by the modulus signal end AD123IN0 of stable signal output to STM32F103Rc.CPU The information for being analyzed and processed to signal and voltage signal being changed into flow speed value in pipe network is sent to main website through CAN.It is main The information for collecting each node of standing carry out again overall process analysis with realize the flow rate of water flow of whole pipe network system monitoring and Optimized Operation.

Claims (1)

1. a kind of measuring circuit of drainage pipeline networks flow velocity, including RAM plate basic circuits part, signal generating circuit part and signal Output circuit part;
It is characterized in that:RAM plate basic circuits part includes CPU, power module of voltage regulation circuit, voltage filter modular circuit, electricity Pressure modular converter circuit, serial ports download modular circuit, clock module circuit, debugging module circuit, starting module circuit and CAN transceiver module circuits;Described CPU uses STM32F103Rc chips;
The power module of voltage regulation circuit includes five electric capacity;Wherein the first filter capacitor C7 one end, the second filter capacitor C8 One end, the 3rd filter capacitor C9 one end, the 4th filter capacitor C10 one end, the 5th filter capacitor C11 one end all with electricity Source VCC ends are connected, and the other end of five filter capacitors is all grounded;
The voltage filter module includes two electric capacity;Wherein the 6th filter capacitor C14 one end, the 7th filter capacitor C13 One end is all connected with analog power AVCC one end and connects CPU 13 pin, and the other end of two filter capacitors is all grounded simulation Ground AGND;
The voltage transformation module includes two electric capacity;Wherein the 8th filter capacitor C15 one end and CPU 47 pin connect, separately One end is grounded;9th filter capacitor C16 one end and CPU 31 pin connect, other end ground connection;
The serial ports module that downloads includes three resistance and an electric capacity;First divider resistance R5 one end and the second partial pressure Resistance R7 one end, the 3rd divider resistance R8 connections;First divider resistance R5 another termination power VCC, the second divider resistance The R7 other end and CPU pin 60 connect;First storage capacitor C12 one end is connected with CPU NRST interfaces, the other end with The 3rd divider resistance R8 other end is connected and is grounded;
The clock module includes a crystal oscillator and two electric capacity;First crystal oscillator Y1 one end and the second storage capacitor C1 one end Connection, and be connected with CPU pin 6;The first crystal oscillator Y1 other end is connected with the 3rd storage capacitor C2 one end, and and CPU Pin 5 connect;The second storage capacitor C1 other end, the 3rd storage capacitor C2 other end ground connection;
The debugging module includes a light emitting diode and a resistance;4th divider resistance R6 one end and CPU PA15/ JTDI pins are connected, and the other end is connected with light emitting diode DS1 positive pole, light emitting diode DS1 negative pole ground connection;
The starting module includes a resistance;First pull-up resistor R9 one end and CPU pin 28 connect, another termination Ground;
The CAN transceiver modules include four resistance, four electric capacity, four Transient Suppression Diodes and CAN interface integrated chip U1;CAN interface integrated chip U1 model SN65HVD1050;First Transient Suppression Diode TVS1 anode, the second transient state Suppress diode TVS2 anode, the 3rd Transient Suppression Diode TVS3 anode, the 4th Transient Suppression Diode TVS4 sun Pole is connected with the positive pole of cross thermocouple;First Transient Suppression Diode TVS1 negative electrode, the second Transient Suppression Diode TVS2 Negative electrode be connected with CAN interface integrated chip U1 7 pin;3rd Transient Suppression Diode TVS3 negative electrode, the 4th transient state suppress Diode TVS4 negative electrode is connected with CAN interface integrated chip U1 6 pin;CAN interface integrated chip U1 4 pin and the second pull-up Resistance R1 one end connection, CAN interface integrated chip U1 1 pin are connected with the 3rd pull-up resistor R2 one end, the second pull-up electricity Hinder the R1 other end and the 3rd pull-up resistor R2 other end, the 22nd filter capacitor C5 one end, the tenth filter capacitor C6 One end and CAN interface integrated chip U1 pin 3 connect and connect+5V power supplys;The 22nd filter capacitor C5 other ends, the tenth The filter capacitor C6 other end and CAN interface integrated chip U1 pin 2 are connected and are grounded, CAN interface integrated chip U1's Pin 5 is connected with the 11st filter capacitor C4 one end, and the 11st filter capacitor C4 other end ground connection, CAN interface integrates core Piece U1 pin 8 is hanging;
Described CPU 12 pin connect digitally, and CPU 18 pin ground connection, 19 pin, 64 pin, 48 pin, 32 pin meet VCC;CPU is herein In the pin do not mentioned it is all aerial;
7 pin with CAN interface integrated chip U1,6 pin are connected connector RJ1 4 pin, 5 pin successively, 1 pin, 2 pin, 3 pin, 6 pin, 7 Pin, 8 pin ground connection;7 pin with CAN interface integrated chip U1,6 pin are connected connector RJ2 4 pin, 5 pin successively, 1 pin, 2 pin, 3 Pin, 6 pin, 7 pin, 8 pin ground connection;Connector P_CANH1 1 pin is connected with CAN interface integrated chip U1 7 pin, on 2 pin and the 4th Pull-up resistor R3 one end connection, connector P_CANL1 2 pin are connected with CAN interface integrated chip U1 6 pin, on 1 pin and the 5th Pull-up resistor R4 one end connection, the 4th pull-up resistor R3 other end and the 5th pull-up resistor R4 other end, the 28th filter Ripple electric capacity C3 one end connection, the 28th filter capacitor C3 other end ground connection;
In addition with externally fed interface JP1, pin 1 meets power supply VCC, and pin 2 meets analog power AVCC, and pin 3 meets VEE, pipe Pin 4 is grounded;Power supply interface JP2, pin 1 meet power supply VCC, and pin 2 connects CPU pin 46, and pin 3 connects CPU pin 49, pin 4 ground connection;
Signal generating circuit includes voltage-stabilized power supply circuit, square wave generation circuit, sine wave generating circuit, filter circuit and amplification electricity Road;
The voltage-stabilized power supply circuit includes two electric capacity;12nd filter capacitor C24 one end and the 13rd filter capacitor C25's One termination power VCC, the 12nd filter capacitor C24 and the 13rd filter capacitor C25 other end ground connection;
Side's wave generation circuit includes one without source crystal oscillator and an electric capacity;14th filter capacitor C33 one end and nothing Source crystal oscillator X17 4 pin meet power supply VCC, and the 14th filter capacitor C33 other end and crystal oscillator X17 pin 2 are grounded, passive Crystal oscillator X17 pin 1 is hanging;
The sine wave generating circuit includes a 9833 chip U10, two electric capacity;15th filter capacitor C23 one end with 9833 chip U10 pin 1 connects, the 15th filter capacitor C23 other end and 9833 chip U10 pin 2 and power supply VCC connections;16th filter capacitor C30 one end is connected with 9833 chip U10 pin 3, and the 16th filter capacitor C30's is another One end and 9833 chip U10 pin 4 are grounded;9833 chip U10 pin 5 is connected with the pin 3 without source crystal oscillator X17; 9833 chip U10 9 pin ground connection;9833 chip U10 pin 6, pin 7, pin 8 successively the pin 36 with CPU, pin 34, Pin 33 connects;
First filter circuit includes two resistance, six electric capacity and two inductance;First filter resistance R30 one end and the 17 filter capacitor C32 one end, 9833 chip U10 pin 10 connect;The first filter resistance R30 other end and the 17th Filter capacitor C32 other end ground connection;18th filter capacitor C27 one end and the 19th filter capacitor C28 one end, second Ten filter capacitor C31 one end, one end connection of the first filter inductance L17 one end, the second filter inductance L18, the 18th filter The ripple electric capacity C27 other end is connected with the first filter inductance L17 other end, 9833 chip U10 pin 10;Second filtered electrical Feel the L18 other end and the 19th filter capacitor C28 other end, the 21st filter capacitor C29 one end, the second filtered electrical Hinder one end connection of R29 one end, the first coupled capacitor C26;The 20th filter capacitor C31 other end, the 21st filtering The other end ground connection of the electric capacity C29 other end, the second filter resistance R29;
The amplifying circuit includes two resistance, an electric capacity, an operational amplifier;The model of described operational amplifier EL5100W;
Operational amplifier P19 output end O pins and the 3rd filter resistance R27 of lead compensation circuit and lead compensation circuit 27th filter capacitor C22 one end is connected, the 3rd filter resistance R27 of the lead compensation circuit other end and lead compensation 27th filter capacitor C22 of the circuit other end, the 4th filter resistance R28 of lead compensation circuit one end, computing are put Big device P19 backward end IN- is connected;Operational amplifier P19 end IN+ in the same direction is connected with the first coupled capacitor C26;Lead compensation The 4th filter resistance R28 other end of circuit is connected and is grounded with operational amplifier P19 EN pins;Operational amplifier P19 V+ pins meet power supply VCC, operational amplifier P19 V- pins meet power supply VEE;Operational amplifier P19 output end O and socket P18 1 port is connected, and P18 another port 2 is grounded;
Signal output apparatus part includes instrument amplifier modular circuit, absolute value block circuit, output voltage filtration module electricity Road;
The instrument amplifier part includes two electric capacity, a resistance, an instrument amplifier and the socket of 2 ports; Two RG pins of instrument amplifier are connected with gain setting resistor R18 both ends, Vin- pins and socket P17 1 port phase Even, Vin+ pins are connected with socket P17 2 ports, and one end of V- pins and power supply VEE, the 23rd filter capacitor C18 connects Connecing, Ref pins ground connection, Vo pins are connected with the 5th divider resistance R26 of absolute value block, the 6th divider resistance R25 one end, V+ pins are connected with power supply VCC, the 24th filter capacitor C17 one end;23rd filter capacitor C18 another termination Ground;24th filter capacitor C17 other end ground connection;
The absolute value circuit includes 6 resistance, two operational amplifiers, two diodes;First operational amplifier and second The model LM258D of operational amplifier;The one of first operational amplifier U17A inverting input and the first pull down resistor R20 End, the first diode D17 negative pole, the 7th divider resistance R17 one end are connected, normal phase input end and the 5th divider resistance R26 The other end be connected, output end is connected with diode D17 positive pole, the second diode D18 negative pole;Second operational amplifier U17B inverting input is connected with the 8th divider resistance R21, the 9th piezoresistance R19 one end, normal phase input end and the 6th point Piezoresistance R25 one end is connected, output end and the tenth point of piezoelectricity in the 9th divider resistance the R19 other end and filter circuit Resistance R24 is connected;First pull down resistor R20 other end ground connection;The 7th divider resistance R17 other end, the 8th divider resistance R21 The other end and the second diode D18 positive pole be connected;
Second filter circuit includes three resistance, three electric capacity;The tenth divider resistance R24 other end and the 12nd partial pressure Resistance R23 one end, the 25th filter capacitor C21 one end are connected;The 12nd divider resistance R23 other end and the 13rd Divider resistance R22 one end, the 28th filter capacitor C20 one end are connected;The 13rd divider resistance R22 other end and 26 filter capacitor C19 one end is connected and connects CPU AD123IN0 interfaces;The 25th filter capacitor C21 other end, The 28th filter capacitor C20 other end, the 26th filter capacitor C19 other end is all grounded.
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