CN208187478U - A kind of ultrasonic wave redundant flow meter - Google Patents
A kind of ultrasonic wave redundant flow meter Download PDFInfo
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- CN208187478U CN208187478U CN201820719685.9U CN201820719685U CN208187478U CN 208187478 U CN208187478 U CN 208187478U CN 201820719685 U CN201820719685 U CN 201820719685U CN 208187478 U CN208187478 U CN 208187478U
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Abstract
The utility model discloses a kind of ultrasonic wave redundant flow meters, belong to technology of instrument and meter field, including MBUS circuit, time measuring circuit, storage circuit, lithium battery circuit and main control chip circuit, it solves in high precision time measurement circuit using the technical issues of voluntarily selecting the MBUS telecommunication circuit of communication module formula to carry out ultrasonic flow rate measuring, the utility model is using three groups of power supply designs, each group of power supply is all individually filtered, realize the isolation between power supply, the measurement for measuring chip for the time provides pure environment, guarantee the minimum for the interference reduction that its measurement is subject to；The utility model is using the MBUS circuit for automatically selecting transmission-receiving function, it realizes and MBUS communication is realized using single line, the utility model individually powers to MBUS circuit, and ensure that will not generate interference to other circuits when MBUS circuit communication, also ensures the patency of MBUS circuit communication.
Description
Technical field
The utility model belongs to technology of instrument and meter field, in particular to a kind of ultrasonic wave redundant flow meter.
Background technique
Propagation speed differential method (direct time difference method, time difference method, phase can be divided into according to the principle ultrasonic flowmeter to signal detection
Potential difference method and frequency-difference method), beam deviation method, Doppler method, cross-correlation method, space filter method and Noise Method etc..
Transit time ultrasonic flowmeter is forward surveyed with the difference of reverse speed by detecting and calculating ultrasonic pulse in fluid
Constant flow.When known to the spread speed of sound wave in a fluid, as long as measuring the time difference of sonic transmissions, flow velocity can be found out,
And then flow can be found out.
Because the time difference of ultrasonic wave fair current and adverse current is very small, the required precision of time of measuring is very high, time of measuring
Precision has directly influenced the precision of flowmeter again, thus time interval measurement occupy in entire ultrasonic flowmeter system it is non-
Normal consequence, this just needs a kind of circuit of high-precision timing to realize ultrasonic flow rate measuring.
Utility model content
The purpose of the utility model is to provide a kind of ultrasonic wave redundant flow meters, solve in high precision time measurement circuit
The technical issues of middle MBUS telecommunication circuit using voluntarily selection communication module formula carries out ultrasonic flow rate measuring.
To achieve the above object, the utility model uses following technical scheme:
A kind of ultrasonic wave redundant flow meter, including MBUS circuit, time measuring circuit, storage circuit, lithium battery circuit and
Main control chip circuit；
Main control chip circuit includes main control chip, crystal oscillator XT1, capacitor C11 and capacitor C12, crystal oscillator XT1, capacitor C11 and electricity
Hold C12 and constitutes the peripheral circuit of main control chip；
The model EFM32TG84X of the main control chip；
Lithium battery circuit includes lithium battery, VCC power output circuit, VIO power output circuit and the output of GP_VSG power supply
Circuit, VCC power output circuit include resistance R3, capacitor C10 and capacitor E4, and one end of resistance R3 connects the anode of lithium battery,
The other end exports VCC power supply, and capacitor C10 and capacitor E4 are the filter capacitor on VCC power supply；
VIO power output circuit includes one end connection lithium electricity of resistance R1, capacitor C43, capacitor E3_0 and electricity E3, resistance R1
The anode in pond, the other end export VIO power supply, and capacitor C43, capacitor E3_0 and electricity E3 are the filter capacitor of VIO power supply；
GP_VSG power output circuit includes resistance R2, capacitor C40, capacitor E2_0, capacitor E2 and capacitor C41, resistance R2
One end connection lithium battery anode, the other end export GP_VSG power supply, capacitor C40, capacitor E2_0, capacitor E2 and capacitor C41
For the filter capacitor of GP_VSG power supply；
High precision time measurement circuit includes resistance R39, resistance R35, resistance R34, resistance R30, resistance R31, resistance
R38, resistance R40, resistance R39, resistance R37, capacitor C36 and time measure chip U30, resistance R39, resistance R30, resistance R31,
Resistance R38, resistance R40, resistance R39, resistance R37 and capacitor C36 constitute the peripheral circuit of time measurement chip U30, time
5 feet, 6 feet, 30 feet and 27 feet for measuring chip U30 connect external ultrasound wave sensor, and resistance R35 and resistance R34 are as current limliting
Build-out resistor is connected on respectively on 6 feet and 5 feet of time measurement chip U30, and capacitor C34 and capacitor C35 are connected on the time respectively
On 30 feet and 27 feet for measuring chip U30；
The time measurement chip U30 is high precision time measurement chip TDC-GP2.
24 feet, 23 feet, 20 feet, 19 feet and 18 feet of time measurement chip U30 are all connected with external temperature sensor；
8~16 feet of time measurement chip U30 are communicated with main control chip；GP_VSG power supply is to measure chip U30 the time to supply
Electricity, VIO power supply measure chip U30 for the time and provide reference power source；
Storage circuit includes storage chip U4, resistance R12 and resistance R13,5 feet and 6 feet and master control core of storage chip U4
Piece communication, VCC power supply are that storage circuit and main control chip circuit are powered.The storage chip is eeprom memory, specific
Model 24C64-EEPROM.
The three terminal regulator U51 is the three terminal regulator of 3.6V output.
MBUS circuit includes power circuit and telecommunication circuit, power circuit include TVS pipe D51, resistance R52, resistance R51,
Resistance R53, triode T51, triode T53, diode D53, resistance R54, capacitor C51, three terminal regulator U51, capacitor C52 and
Capacitor C53, the both ends of TVS pipe D51 constitute MBUS interface, and one end of TVS pipe D51 passes through resistance R51 connection ground wire, the other end
By the collector of resistance R52 connecting triode T51, the emitter of triode T51 connects the input terminal of three terminal regulator U51,
The collector of the base stage connecting triode T53 of triode T51, resistance R53 be connected in parallel on triode T51 collector and base stage it
Between, the cathode of the emitter connection diode D53 of triode T53, the anode of diode D53 connects ground wire, and resistance R54 is connected in parallel on
Between the base stage and emitter of triode D53, capacitor C51 is connected in parallel on the input terminal of three terminal regulator U51 as filter capacitor, and three
The end GND connection ground wire, the output end of voltage-stablizer U51 is held to export 3.6V power supply, capacitor C52 and capacitor C53 are that filter circuit is in parallel
In the output end of three terminal regulator U51；
Telecommunication circuit include resistance R59, resistance R61, resistance R70, resistance R55, resistance R57, resistance R58, resistance R56,
Resistance R62, capacitor C54, capacitor C55, comparator U52A, diode D54, triode T52, diode D55, resistance R63, resistance
R68, resistance R69, resistance R67, resistance R65, capacitor C56, comparator U52B, resistance R68, resistance R69, resistance R67, optocoupler
U53, optocoupler U54, resistance R42 and resistance R41, the collector of triode T51, which is connected by resistance R55 with resistance R57, to be compared
The positive input terminal of U52A, the collector of triode T51 also pass through the resistance R59 and resistance R61 connecting triode T52 of series connection
Collector, the emitter of triode T52 passes through R63 connection ground wire, the output of the base stage connection comparator U52B of triode T52
End, the resistance R57 and resistance R56 that the positive input terminal of comparator U52A also passes through series connection connect ground wire, comparator U52A's
Negative input end passes through the cathode of resistance R58 connection diode D54, and the anode of diode D54 passes through resistance R57 connection comparator
The positive input terminal of U52A, the negative input end of comparator U52A also pass through resistance R62 connection ground wire, and capacitor C54 and resistance R62 are simultaneously
Connection, the output end of comparator U52A pass through the positive input terminal of capacitor C55 connection comparator U52A, and the output end of comparator U52A is also
By 2 feet of resistance R65 connection optocoupler U53,1 foot of optocoupler U53 connects 3.6V power supply, and the positive input terminal of comparator U52A is also logical
Cross the cathode of resistance R70 connection diode D55, the output end of the anode connection comparator U52B of diode D55, comparator U52B
Output end also pass through the positive input terminal of capacitor C56 connection comparator U52B, the positive input terminal of comparator U52B connects optocoupler U54
3 feet, resistance R67 is connected in parallel between the positive input terminal and ground wire of comparator U52B, and the negative input end of comparator U52B passes through electricity
R69 connection ground wire is hindered, one end of resistance R68 connects 3.6V power supply, and the other end connects the negative input end of comparator U52B, optocoupler
4 feet of U54 connect 3.6V power supply, and an I/O port of the 4 feet connection main control chip of optocoupler U53, resistance R42 is 4 feet of optocoupler U53
On pull-up resistor, resistance R42 connection VCC power supply, 1 foot of optocoupler R54 passes through resistance R41 connection VCC power supply；The 2 of optocoupler R54
One I/O port of foot connection main control chip.
A kind of ultrasonic wave redundant flow meter described in the utility model, solves and uses in high precision time measurement circuit
The technical issues of voluntarily selecting the MBUS telecommunication circuit of communication module formula to carry out ultrasonic flow rate measuring, the utility model uses three
Group power supply design, all individually filters each group of power supply, realizes the isolation between power supply, measures chip for the time
Measurement provides pure environment, guarantees the minimum for the interference reduction that its measurement is subject to；The utility model uses and automatically selects receipts
The MBUS circuit for sending out function realizes and realizes MBUS communication using single line, and the utility model individually powers to MBUS circuit, protects
Interference will not be generated to other circuits when having demonstrate,proved MBUS circuit communication, also ensure the patency of MBUS circuit communication.
Detailed description of the invention
Fig. 1 is the circuit diagram of the MBUS circuit of the utility model；
Fig. 2 is the circuit diagram of the lithium battery circuit of the utility model；
Fig. 3 is the circuit diagram of the time measuring circuit of the utility model；
Fig. 4 is the circuit diagram of the storage circuit of the utility model；
Fig. 5 is the circuit diagram of the main control chip circuit of the utility model.
Specific embodiment
A kind of ultrasonic wave redundant flow meter as Figure 1-Figure 5, including MBUS circuit, time measuring circuit, storage electricity
Road, lithium battery circuit and main control chip circuit；
Main control chip circuit includes main control chip, crystal oscillator XT1, capacitor C11 and capacitor C12, crystal oscillator XT1, capacitor C11 and electricity
Hold C12 and constitutes the peripheral circuit of main control chip；
The model EFM32TG84X of the main control chip；
Lithium battery circuit includes lithium battery, VCC power output circuit, VIO power output circuit and the output of GP_VSG power supply
Circuit, VCC power output circuit include resistance R3, capacitor C10 and capacitor E4, and one end of resistance R3 connects the anode of lithium battery,
The other end exports VCC power supply, and capacitor C10 and capacitor E4 are the filter capacitor on VCC power supply；
VIO power output circuit includes one end connection lithium electricity of resistance R1, capacitor C43, capacitor E3_0 and electricity E3, resistance R1
The anode in pond, the other end export VIO power supply, and capacitor C43, capacitor E3_0 and electricity E3 are the filter capacitor of VIO power supply；
GP_VSG power output circuit includes resistance R2, capacitor C40, capacitor E2_0, capacitor E2 and capacitor C41, resistance R2
One end connection lithium battery anode, the other end export GP_VSG power supply, capacitor C40, capacitor E2_0, capacitor E2 and capacitor C41
For the filter capacitor of GP_VSG power supply；
Lithium battery circuit uses the power supply by the anode input of lithium battery to be divided into the circuit structure that three tunnels export, per defeated all the way
It is equipped with corresponding filter capacitor and current-limiting resistance out, ensures that each road power supply output is independent in this way, often all the way not
Interference phenomenon can be generated to other two-way.
High precision time measurement circuit includes resistance R39, resistance R35, resistance R34, resistance R30, resistance R31, resistance
R38, resistance R40, resistance R39, resistance R37, capacitor C36 and time measure chip U30, resistance R39, resistance R30, resistance R31,
Resistance R38, resistance R40, resistance R39, resistance R37 and capacitor C36 constitute the peripheral circuit of time measurement chip U30, time
5 feet, 6 feet, 30 feet and 27 feet for measuring chip U30 connect external ultrasound wave sensor, and resistance R35 and resistance R34 are as current limliting
Build-out resistor is connected on respectively on 6 feet and 5 feet of time measurement chip U30, and capacitor C34 and capacitor C35 are connected on the time respectively
On 30 feet and 27 feet for measuring chip U30；
The time measurement chip U30 is high precision time measurement chip TDC-GP2.
DC-GP2 is the trendy time figure conversion devices that ACAM company releases.It has the low-power consumption of high-precision small package
Feature is particularly suitable for the industrial application of low cost.GP2 has High speed pulse generator, and stop signal is enabled, and temperature is surveyed
Functions, these special functional modules such as amount and clock control make it be particularly suitable for measuring ultrasonic wave flow and calorimetry side
The application in face.There are two measurement ranges for it, and the measurement accuracy of time can be made to reach ps grades.TDC-GP2 is the encapsulation of 32 feet, it
Core voltage is 1.8~3.6V, and input and output voltage is 1.8~5.5V.It can be connected with single-chip microcontroller by the SPI of 4 lines,
TDC-GP2 is used as the peripheral equipment of single-chip microcontroller.In addition, it also has the continuous data output rating of maximum 1MHz；Clock school
Quasi- unit；Accurate stop pulse enables window；Rising edge/failing edge individually triggers or rising edge and failing edge trigger simultaneously
Deng.
24 feet, 23 feet, 20 feet, 19 feet and 18 feet of time measurement chip U30 are all connected with external temperature sensor；
8~16 feet of time measurement chip U30 are communicated with main control chip；GP_VSG power supply is to measure chip U30 the time to supply
Electricity, VIO power supply measure chip U30 for the time and provide reference power source；
External temperature sensor uses PT1000 temperature sensor, ensure that time measurement chip U30 has ring in measurement
The beasurement base of border temperature, and temperature-compensating is carried out according to environment temperature.
3 feet, 22 feet, 32 feet, 25 feet and 26 feet of time measurement chip U30 are all connected with VIO power supply, and the time measures chip
29 feet of U30 and 14 feet connect GP_VGS power supply.
8~16 feet of time measurement chip U30 are separately connected one group of I/O port on main control chip, using digital form and master
Control chip communication.
Storage circuit includes storage chip U4, resistance R12 and resistance R13,5 feet and 6 feet and master control core of storage chip U4
Piece communication, VCC power supply are that storage circuit and main control chip circuit are powered.The storage chip is eeprom memory, specific
Model 24C64-EEPROM.
The three terminal regulator U51 is the three terminal regulator of 3.6V output.
MBUS circuit includes power circuit and telecommunication circuit, power circuit include TVS pipe D51, resistance R52, resistance R51,
Resistance R53, triode T51, triode T53, diode D53, resistance R54, capacitor C51, three terminal regulator U51, capacitor C52 and
Capacitor C53, the both ends of TVS pipe D51 constitute MBUS interface, and one end of TVS pipe D51 passes through resistance R51 connection ground wire, the other end
By the collector of resistance R52 connecting triode T51, the emitter of triode T51 connects the input terminal of three terminal regulator U51,
The collector of the base stage connecting triode T53 of triode T51, resistance R53 be connected in parallel on triode T51 collector and base stage it
Between, the cathode of the emitter connection diode D53 of triode T53, the anode of diode D53 connects ground wire, and resistance R54 is connected in parallel on
Between the base stage and emitter of triode D53, capacitor C51 is connected in parallel on the input terminal of three terminal regulator U51 as filter capacitor, and three
The end GND connection ground wire, the output end of voltage-stablizer U51 is held to export 3.6V power supply, capacitor C52 and capacitor C53 are that filter circuit is in parallel
In the output end of three terminal regulator U51；
Triode T51 and triode T53 constitutes a current-limiting circuit, and three terminal regulator is protected not damaged by heavy current impact
It is bad.The 3.6V voltage of three terminal regulator output aims at the power supply of MBUS circuit, makes power supply system phase of the telecommunication circuit with measuring circuit
It is mutually independent, to ensure that measuring circuit is interference-free.
Telecommunication circuit include resistance R59, resistance R61, resistance R70, resistance R55, resistance R57, resistance R58, resistance R56,
Resistance R62, capacitor C54, capacitor C55, comparator U52A, diode D54, triode T52, diode D55, resistance R63, resistance
R68, resistance R69, resistance R67, resistance R65, capacitor C56, comparator U52B, resistance R68, resistance R69, resistance R67, optocoupler
U53, optocoupler U54, resistance R42 and resistance R41, the collector of triode T51, which is connected by resistance R55 with resistance R57, to be compared
The positive input terminal of U52A, the collector of triode T51 also pass through the resistance R59 and resistance R61 connecting triode T52 of series connection
Collector, the emitter of triode T52 passes through R63 connection ground wire, the output of the base stage connection comparator U52B of triode T52
End, the resistance R57 and resistance R56 that the positive input terminal of comparator U52A also passes through series connection connect ground wire, comparator U52A's
Negative input end passes through the cathode of resistance R58 connection diode D54, and the anode of diode D54 passes through resistance R57 connection comparator
The positive input terminal of U52A, the negative input end of comparator U52A also pass through resistance R62 connection ground wire, and capacitor C54 and resistance R62 are simultaneously
Connection, the output end of comparator U52A pass through the positive input terminal of capacitor C55 connection comparator U52A, and the output end of comparator U52A is also
By 2 feet of resistance R65 connection optocoupler U53,1 foot of optocoupler U53 connects 3.6V power supply, and the positive input terminal of comparator U52A is also logical
Cross the cathode of resistance R70 connection diode D55, the output end of the anode connection comparator U52B of diode D55, comparator U52B
Output end also pass through the positive input terminal of capacitor C56 connection comparator U52B, the positive input terminal of comparator U52B connects optocoupler U54
3 feet, resistance R67 is connected in parallel between the positive input terminal and ground wire of comparator U52B, and the negative input end of comparator U52B passes through electricity
R69 connection ground wire is hindered, one end of resistance R68 connects 3.6V power supply, and the other end connects the negative input end of comparator U52B, optocoupler
4 feet of U54 connect 3.6V power supply, and an I/O port of the 4 feet connection main control chip of optocoupler U53, resistance R42 is 4 feet of optocoupler U53
On pull-up resistor, resistance R42 connection VCC power supply, 1 foot of optocoupler R54 passes through resistance R41 connection VCC power supply；The 2 of optocoupler R54
One I/O port of foot connection main control chip.
The utility model is constituted one and is automatically selected transceiver communication mode using two comparators and a triode T52
Logic circuit, so that MBUS is passed through single line to complete the communication of serial ports.
The concrete model of the comparator U52A and comparator U52B is LM358.
MBUS bus outside the connection of MBUS interface, and communicated by MBUS bus with peripheral control unit terminal, outside control
Device terminal communication processed can be computer or terminal device with MBUS bus；MBUS interface reads or passes through after receiving information
The mode for automatically selecting transmitting-receiving of telecommunication circuit, and after the isolation for passing through optocoupler U53 and optocoupler U54, pass information to master control
Chip, the telecommunication circuit of the utility model has the function of to automatically select transceiver mode and is isolated two, and circuit structure is simple, cost
It is low.
In use, main control chip control time measurement chip U30 control supersonic generator issues ultrasonic wave, while time
It measures chip U30 and carries out timing, after receiving echo, the time measures chip U30 and timing time is sent to main control chip, main
Control chip calculates the travel distance of ultrasonic wave by timing time, so judge fluid in front from ultrasonic sensor away from
From.
Fluid flow is calculated with a distance from ultrasonic sensor according to fluid in front, circular is existing skill
Art, therefore be not described in detail.
A kind of ultrasonic wave redundant flow meter described in the utility model, solves and uses in high precision time measurement circuit
MBUS telecommunication circuit carries out the technical issues of ultrasonic flow rate measuring, and the utility model is using three groups of power supply designs, to each group
Power supply is all individually filtered, and the isolation between power supply is realized, and the measurement for measuring chip for the time provides pure ring
Border guarantees the minimum for the interference reduction that its measurement is subject to；The utility model is real using the MBUS circuit for automatically selecting transmission-receiving function
Show and MBUS communication is realized using single line, the utility model individually powers to MBUS circuit, when ensure that MBUS circuit communication
Interference will not be generated to other circuits, also ensure the patency of MBUS circuit communication.
Claims (4)
1. a kind of ultrasonic wave redundant flow meter, it is characterised in that: including MBUS circuit, time measuring circuit, storage circuit, lithium electricity
Pond circuit and main control chip circuit；
Main control chip circuit includes main control chip, crystal oscillator XT1, capacitor C11 and capacitor C12, crystal oscillator XT1, capacitor C11 and capacitor
C12 constitutes the peripheral circuit of main control chip；
Lithium battery circuit includes lithium battery, VCC power output circuit, VIO power output circuit and GP_VSG power output circuit,
VCC power output circuit includes resistance R3, capacitor C10 and capacitor E4, the anode of one end connection lithium battery of resistance R3, the other end
VCC power supply is exported, capacitor C10 and capacitor E4 are the filter capacitor on VCC power supply；
VIO power output circuit includes one end connection lithium battery of resistance R1, capacitor C43, capacitor E3_0 and electricity E3, resistance R1
Anode, the other end export VIO power supply, and capacitor C43, capacitor E3_0 and electricity E3 are the filter capacitor of VIO power supply；
GP_VSG power output circuit includes resistance R2, capacitor C40, capacitor E2_0, capacitor E2 and capacitor C41, and the one of resistance R2
The anode of end connection lithium battery, the other end export GP_VSG power supply, and capacitor C40, capacitor E2_0, capacitor E2 and capacitor C41 are GP_
The filter capacitor of VSG power supply；
MBUS circuit includes power circuit and telecommunication circuit, and power circuit includes TVS pipe D51, resistance R52, resistance R51, resistance
R53, triode T51, triode T53, diode D53, resistance R54, capacitor C51, three terminal regulator U51, capacitor C52 and capacitor
C53, the both ends of TVS pipe D51 constitute MBUS interface, and by resistance R51 connection ground wire, the other end passes through for one end of TVS pipe D51
The collector of resistance R52 connecting triode T51, the input terminal of the emitter connection three terminal regulator U51 of triode T51, three poles
The collector of the base stage connecting triode T53 of pipe T51, resistance R53 are connected in parallel between the collector and base stage of triode T51, and three
The cathode of the emitter connection diode D53 of pole pipe T53, the anode connection ground wire of diode D53, resistance R54 are connected in parallel on three poles
Between the base stage and emitter of pipe D53, capacitor C51 is connected in parallel on the input terminal of three terminal regulator U51 as filter capacitor, and three ends are steady
The end GND connection ground wire, the output end of depressor U51 exports 3.6V power supply, and capacitor C52 and capacitor C53 are that filter circuit is connected in parallel on three
Hold the output end of voltage-stablizer U51；
Telecommunication circuit includes resistance R59, resistance R61, resistance R70, resistance R55, resistance R57, resistance R58, resistance R56, resistance
R62, capacitor C54, capacitor C55, comparator U52A, diode D54, triode T52, diode D55, resistance R63, resistance R68,
Resistance R69, resistance R67, resistance R65, capacitor C56, comparator U52B, resistance R68, resistance R69, resistance R67, optocoupler U53, light
Coupling U54, resistance R42 and resistance R41, the collector of triode T51, which is connected by resistance R55 with resistance R57, is comparing U52A just
Input terminal, the collector of triode T51 also pass through the current collection of the resistance R59 and resistance R61 connecting triode T52 of series connection
Pole, for the emitter of triode T52 by R63 connection ground wire, the base stage of triode T52 connects the output end of comparator U52B, than
The resistance R57 and resistance R56 that positive input terminal compared with device U52A also passes through series connection connect ground wire, the negative input of comparator U52A
End passes through the cathode of resistance R58 connection diode D54, and the anode of diode D54 is passing through resistance R57 connection comparator U52A just
Input terminal, the negative input end of comparator U52A also pass through resistance R62 connection ground wire, and capacitor C54 is in parallel with resistance R62, comparator
The output end of U52A passes through the positive input terminal of capacitor C55 connection comparator U52A, and the output end of comparator U52A also passes through resistance
1 foot of 2 feet of R65 connection optocoupler U53, optocoupler U53 connects 3.6V power supply, and the positive input terminal of comparator U52A also passes through resistance
The cathode of R70 connection diode D55, the output end of the anode connection comparator U52B of diode D55, the output of comparator U52B
End also passes through the positive input terminal of capacitor C56 connection comparator U52B, and the positive input terminal of comparator U52B connects 3 feet of optocoupler U54,
Resistance R67 is connected in parallel between the positive input terminal and ground wire of comparator U52B, and the negative input end of comparator U52B is connected by resistance R69
Ground line, one end of resistance R68 connect 3.6V power supply, and the other end connects the negative input end of comparator U52B, 4 feet of optocoupler U54
3.6V power supply is connected, an I/O port of the 4 feet connection main control chip of optocoupler U53, resistance R42 is the pull-up on 4 feet of optocoupler U53
1 foot of resistance, resistance R42 connection VCC power supply, optocoupler R54 passes through resistance R41 connection VCC power supply；2 feet of optocoupler R54 connect master
Control an I/O port of chip；
High precision time measurement circuit includes resistance R39, resistance R35, resistance R34, resistance R30, resistance R31, resistance R38, electricity
Hinder R40, resistance R39, resistance R37, capacitor C36 and time measurement chip U30, resistance R39, resistance R30, resistance R31, resistance
R38, resistance R40, resistance R39, resistance R37 and capacitor C36 constitute the peripheral circuit of time measurement chip U30, time measurement
5 feet, 6 feet, 30 feet and 27 feet of chip U30 connect external ultrasound wave sensor, resistance R35 and resistance R34 and match as current limliting
Resistance is connected on respectively on 6 feet and 5 feet of time measurement chip U30, and capacitor C34 and capacitor C35 are connected on time measurement respectively
On 30 feet and 27 feet of chip U30；
24 feet, 23 feet, 20 feet, 19 feet and 18 feet of time measurement chip U30 are all connected with external temperature sensor；
8~16 feet of time measurement chip U30 are communicated with main control chip；GP_VSG power supply is to measure chip U30 power supply the time,
VIO power supply measures chip U30 for the time and provides reference power source；
Storage circuit includes storage chip U4, resistance R12 and resistance R13, and 5 feet and 6 feet and main control chip of storage chip U4 are logical
Letter, VCC power supply are that storage circuit and main control chip circuit are powered.
2. a kind of ultrasonic wave redundant flow meter as described in claim 1, it is characterised in that: the time measures chip U30 and is
High precision time measurement chip TDC-GP2.
3. a kind of ultrasonic wave redundant flow meter as described in claim 1, it is characterised in that: the model of the main control chip
EFM32TG84X；The storage chip is eeprom memory.
4. a kind of ultrasonic wave redundant flow meter as described in claim 1, it is characterised in that: the three terminal regulator U51 is
The three terminal regulator of 3.6V output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820719685.9U CN208187478U (en) | 2018-05-15 | 2018-05-15 | A kind of ultrasonic wave redundant flow meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820719685.9U CN208187478U (en) | 2018-05-15 | 2018-05-15 | A kind of ultrasonic wave redundant flow meter |
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| CN208187478U true CN208187478U (en) | 2018-12-04 |
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ID=64430267
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068820A (en) * | 2019-05-30 | 2019-07-30 | 中山市福瑞康电子有限公司 | A kind of portable ultrasonic height range unit |
-
2018
- 2018-05-15 CN CN201820719685.9U patent/CN208187478U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068820A (en) * | 2019-05-30 | 2019-07-30 | 中山市福瑞康电子有限公司 | A kind of portable ultrasonic height range unit |
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