CN213120676U - Ultrasonic gas meter signal processing circuit and system - Google Patents
Ultrasonic gas meter signal processing circuit and system Download PDFInfo
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- CN213120676U CN213120676U CN202022512107.8U CN202022512107U CN213120676U CN 213120676 U CN213120676 U CN 213120676U CN 202022512107 U CN202022512107 U CN 202022512107U CN 213120676 U CN213120676 U CN 213120676U
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Abstract
A signal processing circuit and a system of an ultrasonic gas meter comprise an operational amplifier U3, a sensor J1, a sensor J2, a chip U1, a chip U2, a singlechip U4 and an impedance matching circuit, wherein the sensor J1 and a sensor J2 are both connected with the chip U1 and the chip U2, the chip U1 is also connected with a capacitor C4 and a singlechip U4, the chip U2 is also connected with the singlechip U4 and an operational amplifier U3, the operational amplifier U3 is connected with the singlechip U4, the operational amplifier U3 is connected with a resistor R6 and a capacitor C6 which are connected in series with each other and a resistor R7 and a capacitor C5 which are connected with each other, the impedance matching circuit comprises a capacitor C4, a resistor R1 which is connected with the capacitor C4 in series and a capacitor C3, a resistor R3 and a resistor R3 which are respectively connected with the capacitor C4 in parallel, the capacitor J3 is connected with the chip U3, and the impedance of the sensor J3 and the singlechip U3 is the same as, the optimized transmission of ultrasonic signals is realized, the acquisition precision of the single chip microcomputer U4 is improved, and the gas measurement work is carried out efficiently.
Description
Technical Field
The utility model belongs to ultrasonic wave gas table measures sky gas flow field, concretely relates to impedance matching circuit, ultrasonic wave gas table signal processing circuit and system.
Background
Along with the large-scale popularization and application of national energy conservation and emission reduction and environmental protection in blue sky, the natural gas is more and more widely used, and the measurement of the natural gas flow through the ultrasonic gas meter becomes a measurement mode which is widely applied at present.
The principle of ultrasonic wave metering is that two ultrasonic wave sensors are respectively arranged at the upstream and the downstream of a natural gas flow channel, the time difference of ultrasonic wave signals during forward flow and backward flow transmission between the two ultrasonic wave sensors is obtained through the AD signal sampling function of a single chip microcomputer to indirectly measure the speed of fluid, the flow rate is calculated through the flow speed, when the transmission time difference is measured, the accuracy of sampling data is influenced because the ultrasonic wave signals of the sensors are weak when the ultrasonic wave signals of the sensors are directly sampled through the AD signal sampling function of the single chip microcomputer, in the prior art, an operational amplifier is adopted to amplify mV ultrasonic wave signals to V-level ultrasonic wave signals and then output the signals to the single chip microcomputer for collection, on one hand, the resistance of the operational amplifier is different from the resistance of the ultrasonic wave sensors due to the fact that the operational amplifier needs to add resistance voltage division and capacitance voltage stabilization when receiving the ultrasonic wave signals, if impedance matching is not good, waveform abnormality is caused, a singlechip AD sampling cannot obtain an optimal ultrasonic signal, and deviation is brought to a measurement result, and on the other hand, the pulse excitation frequency of the ultrasonic sensor is approximately within the range of 200K-500K, so that high-frequency harmonic waves outside the frequency range interfere acquisition of the ultrasonic signal, and acquisition precision is influenced.
The single chip microcomputer is used as a microcontroller, various operations and data transmission can be completed by the single chip microcomputer through a diversified data acquisition and control system, and the single chip microcomputer is widely applied to communication equipment, real-time industrial control, navigation systems, household appliances and the like.
Disclosure of Invention
Not enough to prior art exists, the utility model aims to provide an ultrasonic wave gas table signal processing circuit and system, output the mode that the singlechip was gathered after solving among the prior art through adopting operational amplifier to ultrasonic signal enlargies, can make singlechip AD sampling can not obtain the optimal ultrasonic signal because of operational amplifier's impedance and ultrasonic sensor's impedance difference on the one hand, bring the deviation to the measuring result, on the other hand, operational amplifier can produce the high frequency harmonic and bring the interference to ultrasonic signal's collection, influence the problem of gathering the precision.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
an ultrasonic gas meter signal processing circuit comprises an operational amplifier U3, a sensor J1, a sensor J2, a chip U1, a chip U2, a single chip U4 and an impedance matching circuit, wherein the sensor J1 and the sensor J2 are connected with the chip U1 and the chip U2, the chip U1 is further connected with a capacitor C4 and the single chip U4, the chip U2 is further connected with the single chip U4 and the operational amplifier U3, the operational amplifier U3 is further connected with the single chip U4, and the operational amplifier U3 is further connected with a resistor R6 and a capacitor C6 which are connected in series with each other, and a resistor R7 and a capacitor C5 which are connected with each other; the impedance matching circuit comprises a capacitor C4, a resistor R1 connected with the capacitor C4 in series, and a capacitor C3, a resistor R2 and a resistor R3 which are respectively connected with the capacitor C4 in parallel, wherein the capacitor C4 is connected with the chip U1.
Further, the ultrasonic gas meter signal processing circuit further comprises a voltage division filter circuit, and the voltage division filter circuit comprises a resistor R14 connected with the operational amplifier U3, a capacitor C14 connected to the resistor R14 in parallel, a resistor R15, and a resistor R13.
Furthermore, the ultrasonic gas meter signal processing circuit further comprises a power decoupling circuit, wherein the power decoupling circuit comprises a capacitor C13 and a capacitor C7 which are connected to the operational amplifier U3 and are connected with each other in an interconnecting mode.
Further, the ultrasonic gas meter signal processing circuit further comprises a resistor R4 and a resistor R5, the resistor R4 is connected with the capacitor C4, and the resistor R5 is connected with the chip U2.
An ultrasonic gas meter signal processing system comprises an input module, a first sensor module, a second sensor module, a main control module, an operational amplification module, an impedance matching module and an output module; the input module is in pulse excitation and is used for controlling the first sensor module or the second sensor module to send out ultrasonic signals; the first sensor module is connected with the input module and used for sending an ultrasonic signal to the second sensor module; the second sensor module is connected with the input module and the first sensor module and is used for sending an ultrasonic signal to the first sensor module; the main control module is respectively connected with the first sensor module, the second sensor module and the operational amplification module and is used for controlling the first sensor module to send an ultrasonic signal to the second sensor module or the second sensor module to send an ultrasonic signal to the first sensor module and controlling the operational state of the operational amplifier; the operation amplification module is connected with the first sensor module or the second sensor module and is used for amplifying the ultrasonic signals sent by the first sensor module or the ultrasonic signals sent by the second sensor module; the impedance matching module is connected with the first sensor module and the second sensor module and is used for adjusting the impedance of the operational amplification module to be the same as the impedance of the first sensor module and the impedance of the second sensor module; and the output module is connected with the operational amplification module and the main control module and is used for transmitting the waveform signal amplified by the operational amplification module to the main control module.
Further, the first sensor module comprises a sensor J1 and a chip U1, the second sensor module comprises a sensor J2 and a chip U2, one end of the sensor J1 is grounded, the other end of the sensor J1 is connected with the 3 end of the chip U1 and the 1 end of the chip U2, the 5 end of the chip U1 is connected with a power source VCC, the 2 end of the chip U1 is grounded, and the 4 end of the chip U1 is an ultrasonic signal output end; sensor J2's one end ground connection, the other end and chip U1's 1 end and chip U2's 3 end connection, chip U2's 5 end is connected with the power VCC, and chip U2's 2 end ground connection, chip U2's 4 ends are ultrasonic signal output end, chip U1's 5 end still is connected the back ground connection with electric capacity C1, chip U2's 5 end still is connected the back ground connection with electric capacity C2.
Further, the main control module comprises a single chip microcomputer U4, a control end 1 of the single chip microcomputer U4 is connected with an end 6 of the chip U1, and a control end 2 of the single chip microcomputer U4 is connected with an end 6 of the chip U2.
Furthermore, the operational amplification module comprises an operational amplifier U3, wherein the 3 end of the operational amplifier U3 is connected with the 4 end of the chip U2 through a capacitor C11, the 3 end of the operational amplifier U3 is further connected with one end of a resistor R14, the other end of a resistor R14 is connected with a capacitor C14, the other end of the capacitor C14 is grounded, the other end of a resistor R14 is further connected with one end of a resistor R13 and one end of a resistor R15, the other end of the resistor R13 is connected with a power supply VCC, and the other end of the resistor R15 is grounded; operational amplifier's 4 ends are connected with resistance R6 one end, and the resistance R6 other end is connected with electric capacity C6 one end, and electric capacity C6 other end ground connection, operational amplifier's 4 ends still are connected with resistance R7 one end, and the resistance R7 other end is connected with operational amplifier's 1 end, and resistance R7's both ends still are connected with electric capacity C5's both ends, operational amplifier's 6 ends are connected with electric capacity C7 one end, electric capacity C11 one end and power VCC respectively, electric capacity C7 other end and electric capacity C11 other end are connected the back ground connection, operational amplifier 5 ends are connected with singlechip U4's control end RXEN.
Further, the impedance matching module comprises a resistor R4 and a capacitor C4 which are respectively connected with the 4 ends of the chip U1, and a resistor R5 which is connected with the 4 ends of the chip U2, the resistor R4 is also connected with pulse excitation, the other end of the capacitor C4 is connected with one end of a resistor R1, the other end of the resistor R1 is respectively connected with one end of a capacitor C3, one end of a resistor R3 and one end of a resistor R2, the other end of the capacitor C3, the other end of the resistor R3 and the other end of the resistor R2 are respectively grounded, and the resistor R5 is also grounded.
Further, the output module comprises a resistor R9, one end of the resistor R9 is connected with the end 1 of the operational amplifier, the other end of the resistor R9 is connected with one end of a capacitor C12 and one end of a capacitor C10 respectively, the other end of the capacitor C12 is grounded, and the other end of the capacitor C10 is connected with an AD sampling end of the singlechip U4.
Compared with the prior art, the utility model, following technological effect has:
(I) the utility model provides an impedance matching circuit, through electric capacity C4, resistance R1, electric capacity C3, resistance R2 and resistance R3's synergism, the ultrasonic signal who has realized that the sensor sends is when enlargiing through operational amplifier, impedance with the sensor matches the same with operational amplifier's impedance, make operational amplifier can obtain ultrasonic signal's crest value, ultrasonic signal's optimization transmission has been realized, make the data that AD gathered more be accurate.
(II) the utility model provides an ultrasonic gas meter signal processing circuit, in the ultrasonic signal that sends out sensor J1 or sensor J2 is amplified the processing procedure through operational amplifier U3, singlechip U4 further controls sensor J1 and sensor J2 and sends ultrasonic signal each other through controlling chip U1 and chip U2 respectively, send ultrasonic signal to operational amplifier U3 and amplify the processing through chip U2, through adding impedance matching circuit, concretely, through electric capacity C4, resistance R1 and electric capacity C3, resistance R2 and resistance R3 that respectively and parallelly connected with electric capacity C4 that establish ties with electric capacity C4, electric capacity C4 is connected with chip U1, make the impedance of sensor J1 and sensor J2 the same with the impedance of operational amplifier U3, realize the high power transmission of ultrasonic signal, make singlechip U4 can gather the crest value of ultrasonic signal of operational amplifier U3 output, the optimized transmission of ultrasonic signals is realized, the acquisition precision of the single chip microcomputer U4 is improved, the information acquired by the impedance matching circuit is infinitely close to the actual natural gas using flow, and the gas measurement working precision is improved.
(III) the utility model provides a pair of ultrasonic wave gas table signal processing circuit, resistance R7 and electric capacity C5 through setting up mutual series resistance R6 and electric capacity C6 and the hookup each other on operational amplifier U3, resistance R6 can increase ultrasonic signal's load by electric capacity C6, reduce the phase deviation who exchanges ultrasonic signal transmission, resistance R7 and resistance R6 are gain resistance, mutually support and be used for embodying operational amplifier U3's magnification, electric capacity C5 and resistance R7 interact play the effect of fortune and put the filtering, can effectually get rid of the high frequency harmonic and bring the interference to ultrasonic signal's collection, improve and gather the precision.
(IV) the utility model provides an ultrasonic gas meter signal processing system, through setting up the input module for the pulse excitation, the main control module control pulse excitation to first sensor module or second sensor module, and realize under the control of main control module that first sensor module sends ultrasonic signal to second sensor module or second sensor module sends ultrasonic signal to first sensor module, the main control module receives the ultrasonic signal that first sensor module or second sensor module sent at control operation amplification module and carries out the amplification processing, impedance matching module locates between second sensor module and operation amplification module, match the impedance of first sensor module and second sensor module with the impedance of operation amplification module, make the ultrasonic signal reach the optimum transmission, operation amplification module will be the best ultrasonic signal and the crest signal transmission after amplifying output module, the main control module is connected with the output module and collects the ultrasonic signals, the collection precision of the main control module is improved, the collected ultrasonic signals are further enabled to be infinitely close to the actual flow information of natural gas, and the gas measurement working precision is improved.
Drawings
Fig. 1 is a circuit diagram of the ultrasonic gas meter signal processing circuit of the present invention;
fig. 2 is a block diagram of the signal processing of the ultrasonic gas meter provided by the present invention;
fig. 3 is an ultrasonic signal diagram obtained by AD sampling provided by the present invention;
fig. 4 is a working principle diagram of the ultrasonic gas meter of the utility model.
Detailed Description
The following embodiments of the present invention are given, and it should be noted that the present invention is not limited to the following embodiments, and all the equivalent transformations made on the basis of the technical solution of the present application all fall into the protection scope of the present invention.
In the following embodiments, the downstream refers to the same direction as the flow direction of the natural gas, that is, the ultrasonic signal emitted from the sensor disposed downstream to the sensor disposed upstream is an ultrasonic signal propagating downstream; the reverse flow is a direction opposite to the flow direction of the natural gas, that is, an ultrasonic signal emitted from a sensor disposed upstream to a sensor disposed downstream is an ultrasonic signal propagating in the reverse flow, and in this embodiment, the sensor J1 is disposed upstream and the sensor J2 is disposed downstream.
Example 1:
an ultrasonic gas meter signal processing circuit is shown in fig. 1 and comprises an operational amplifier U3, a sensor J1, a sensor J2, a chip U1, a chip U2, a single chip microcomputer U4 and an impedance matching circuit, wherein the sensor J1 and the sensor J2 are connected with a chip U1 and a chip U2, the chip U1 is further connected with a capacitor C4 and the single chip microcomputer U4, the chip U2 is further connected with the single chip microcomputer U4 and the operational amplifier U3, the operational amplifier U3 is further connected with the single chip microcomputer U4, and the operational amplifier U3 is further connected with a resistor R6 and a capacitor C6 which are connected in series with each other and a resistor R7 and a capacitor C5 which are connected with each other;
the impedance matching circuit comprises a capacitor C4, a resistor R1 connected with the capacitor C4 in series, and a capacitor C3, a resistor R2 and a resistor R3 which are respectively connected with the capacitor C4 in parallel, wherein the capacitor C4 is connected with the chip U1.
In the signal processing circuit of the ultrasonic gas meter in this embodiment, the sensor J1 or the sensor J2 mutually sends out ultrasonic waves and converts the ultrasonic waves into ultrasonic signals, the operational amplifier U3 amplifies the ultrasonic signals sent out by the sensor J1 or the sensor J2, the single chip microcomputer U4 further controls the sensor J1 and the sensor J2 to mutually send out ultrasonic signals through respectively controlling the chip U1 and the chip U2, the chip U2 sends the ultrasonic signals to the operational amplifier U3 for amplification, and by adding an impedance matching circuit, specifically, the impedance of the high power sensor J1 and the sensor J2 is the same as the impedance of the operational amplifier U3 by the capacitor C4, the resistor R1 connected in series with the capacitor C4, and the capacitor C3, the resistor R2 and the resistor R3 connected in parallel with the capacitor C4, respectively, and the capacitor C4 is connected with the chip U1, so as to realize the transmission of the ultrasonic signals, the peak value of the ultrasonic signal which can be collected by the single chip microcomputer U4 and is output by the operational amplifier U3 is shown in fig. 3, the optimized transmission of the ultrasonic signal is realized, the collection precision of the single chip microcomputer U4 is improved, the information collected by the impedance matching circuit is infinitely close to the actual natural gas use flow, and the gas measurement work precision is improved.
In this embodiment, through setting up mutual series resistance R6 and electric capacity C6 and mutual resistance R7 and electric capacity C5 of hookup on operational amplifier U3, resistance R6 can electric capacity C6 can increase the load of ultrasonic signal, reduce the phase deviation of exchanging ultrasonic signal transmission, resistance R7 and resistance R6 are gain resistance, the mutual cooperation is used for embodying the magnification of operational amplifier U3, electric capacity C5 and resistance R7 interact play the effect of operational amplifier filtering, can effectually get rid of the high frequency harmonic and bring the interference to the collection of ultrasonic signal, improve the collection precision.
In the embodiment, the single chip microcomputer U4 is respectively connected with the chip U1, the chip U2 and the operational amplifier U3, the operational amplifier U3 is controlled according to the work of the chip U1 and the chip U2, the energy consumption of a circuit is reduced, and the service life of the ultrasonic gas meter is prolonged.
When the impedance matching between the operational amplifier U3 with the model number of OPA836 and the impedance matching between the sensor J1 with the model number of PSC200K018102H3AD0-B1-CN-20 and the sensor J1 is implemented in this embodiment, the resistance value of the resistor R1 is 24.9K, the resistance value of the resistor R2 is 2.00M, the resistance value of the resistor R3 is 2.00M, the capacitance value of the capacitor C3 is 2.2uf, the capacitance value of the capacitor C4 is 1uf, and the model number of the single chip microcomputer U4 is: MSP430FR6043, the model of chip U1 is: CH443, the model number of chip U2 is: CH443, the capacitance value of the capacitor C5 is 33pf, the capacitance value of the capacitor C6 is 1uf, the resistance value of the resistor R6 is 10.0, and the resistance value of the resistor R7 is 1.82K.
In this embodiment, the amplification factor of the ultrasonic signal is: (R7+ R6)/R6 is 1.82K/10 183, which realizes the amplification of the ultrasonic signal from mV level to V level; the filtering algorithm of the capacitor C5 and the resistor R7 is as follows: f1/2 PIR7C5 MHz 2 MHz. The use requirements of less than 1M of the sensor J1 and the sensor J2 of the model PSC200K018102H3AD0-B1-CN-20 in the embodiment are met.
Optionally, the ultrasonic gas meter signal processing circuit further includes a voltage division filter circuit, which includes a resistor R14 connected to the operational amplifier U3, a capacitor C14 connected to the resistor R14 in parallel, a resistor R15, and a resistor R13, after the resistor R14 and the resistor R15 are used for voltage division, the operational amplifier U3 reaches a rated service voltage, so as to prevent the operational amplifier U3 from being damaged by an excessively high voltage, the capacitor C14 can reduce noise on power supply corners of the chip U1 and the chip U2, and the resistor R14 isolates a direct current component in the circuit, thereby enhancing an anti-interference capability of the circuit and improving a working efficiency of the operational amplifier U3.
The resistance value of the resistor R14 is 24.9K, the resistance value of the resistor R15 is 2.00M, the resistance value of the resistor R13 is 2.00M, and the capacitance value of the capacitor C14 is 2.2 uf.
Optionally, the ultrasonic gas meter signal processing circuit further includes a power decoupling circuit, which includes a capacitor C13 and a capacitor C7 connected to the operational amplifier U3 and connected to each other, and the capacitor C13 and the capacitor C7 are decoupling capacitors, so as to provide a relatively stable power supply for the operational amplifier U3, so that the acquisition operation is performed stably, and the acquisition accuracy is further improved.
The capacitance value of the capacitor C13 is 2.2uf, and the capacitance value of the capacitor C7 is 0.1 uf.
Optionally, the ultrasonic gas meter signal processing circuit further includes a resistor R4 and a resistor R5, the resistor R4 is connected to the capacitor C4, the resistor R5 is connected to the chip U2, and the resistor R4 and the resistor R5 are used to increase a load of the ultrasonic signal.
The resistor R4 and the resistor R5 are 806 resistors.
The operating principle of the ultrasonic gas meter signal processing circuit of this embodiment is as follows:
as shown in fig. 4, when the single-chip microcomputer U4 sends 12 200K pulses at the start time and excites the sensor J2 through the CH0 of the chip U1, the sensor J1 receives an ultrasonic signal after the absolute flight time of the ultrasonic wave is T1. The ultrasonic signal is a high-frequency microwave signal, the electric signal converted by the sensor J1 is input into the operational amplifier U3 through CH0 to COM of the chip U2, the impedance matching circuit is connected to COM of the chip U1, the chip U2 is connected to the chip U1, the impedance of the sensor J1 is matched with the impedance of the operational amplifier U3 through the capacitor C4, the resistor R1, the resistor C3, the resistor R2 and the resistor R3, so that the ultrasonic signal can be transmitted to a load point of the operational amplifier U3, the single chip microcomputer U4 collects the electric signal of the amplified optimal waveform, the accurate value of T1 is obtained through AD collection, then the single chip microcomputer U4 sends 12 pulses again after 2ms and excites the sensor J1 through CH1 of the chip U1, after passing through absolute flight time T1 of the ultrasonic wave, the sensor J1 receives the ultrasonic signal, the ultrasonic signal is the ultrasonic signal, the electric signal converted by the sensor J1 is input into the operational amplifier U3 through CH 4672 to COM of the high-frequency microwave chip U1, an impedance matching circuit is connected to the COM of a chip U1, the impedance of a sensor J2 is matched with the impedance of an operational amplifier U3 through a capacitor C4, a resistor R1, a capacitor C3, a resistor R2 and a resistor R3, all ultrasonic signals can be transmitted to a load point of the operational amplifier U3, the single chip U4 collects an amplified electric signal with an optimal waveform, an accurate value of the T2 is obtained through AD collection, and the actual instantaneous flow rate of the natural gas is calculated according to a formula V (L/2cos theta) (1/T1-1/T2) and a formula Q (KSV), wherein V is the gas flow rate of the natural gas, L is the linear distance between the sensor J1 and the sensor J2, theta is the included angle between the connecting line of the sensor J1 and the sensor J2 and the horizontal plane, Q is the instantaneous flow rate of the natural gas, S is the sectional area of a natural gas pipeline, and K is a flow coefficient.
Example 2:
an ultrasonic gas meter signal processing system is shown in fig. 1-2 and comprises an input module, a first sensor module, a second sensor module, a main control module, an operational amplification module, an impedance matching module and an output module; the input module is in pulse excitation and is used for controlling the first sensor module or the second sensor module to send out ultrasonic signals; the first sensor module is connected with the input module and used for sending an ultrasonic signal to the second sensor module; the second sensor module is connected with the input module and the first sensor module and is used for sending an ultrasonic signal to the first sensor module; the main control module is respectively connected with the first sensor module, the second sensor module and the operational amplification module and is used for controlling the first sensor module to send an ultrasonic signal to the second sensor module or the second sensor module to send an ultrasonic signal to the first sensor module and controlling the operational state of the operational amplifier; the operation amplification module is connected with the first sensor module or the second sensor module and is used for amplifying the ultrasonic signals sent by the first sensor module or the ultrasonic signals sent by the second sensor module; the impedance matching module is connected with the first sensor module and the second sensor module and is used for adjusting the impedance of the operational amplification module to be the same as the impedance of the first sensor module and the impedance of the second sensor module; and the output module is connected with the operational amplification module and the main control module and is used for transmitting the waveform signal amplified by the operational amplification module to the main control module.
The utility model provides an ultrasonic gas meter signal processing system, through setting up the input module for the pulse excitation, the main control module control pulse excitation to first sensor module or second sensor module, and realize under the control of main control module that first sensor module sends ultrasonic signal to second sensor module or second sensor module sends ultrasonic signal to first sensor module, the main control module receives the ultrasonic signal that first sensor module or second sensor module sent at control operation amplification module and carries out amplification processing, impedance matching module locates between second sensor module and operation amplification module, match the impedance of first sensor module and second sensor module with the impedance of operation amplification module, make the ultrasonic signal reach the optimization transmission, operation amplification module transmits the best ultrasonic signal, namely after the crest signal amplification to output module, the main control module is connected with the output module and collects the ultrasonic signals, the collection precision of the main control module is improved, the collected ultrasonic signals are further enabled to be infinitely close to the actual flow information of natural gas, and the gas measurement working precision is improved.
Optionally, the first sensor module includes a sensor J1 and a chip U1, the second sensor module includes a sensor J2 and a chip U2, one end of the sensor J1 is grounded, the other end of the sensor J1 is connected to the 3 end of the chip U1 and the 1 end of the chip U2, the 5 end of the chip U1 is connected to a power VCC, the 2 end of the chip U1 is grounded, and the 4 end of the chip U1 is an ultrasonic signal output end; sensor J2's one end ground connection, the other end and chip U1's 1 end and chip U2's 3 end connection, chip U2's 5 end is connected with the power VCC, and chip U2's 2 end ground connection, chip U2's 4 ends are ultrasonic signal output end, chip U1's 5 end still is connected the back ground connection with electric capacity C1, chip U2's 5 end still is connected the back ground connection with electric capacity C2.
The model of the operational amplifier U3 is: OPA836, sensor J1 model number: PSC200K018102H3AD0-B1-CN-20, sensor J2 model is: PSC200K018102H3AD0-B1-CN-20, chip U1 model is: CH443, the model number of chip U2 is: the CH443, the capacitor C1 and the capacitor C2 are decoupling capacitors, the capacitance value of the capacitor C1 is 0.1uf, and the capacitance value of the capacitor C2 is 0.1 uf.
Optionally, the main control module includes a single chip microcomputer U4, a control end 1 of the single chip microcomputer U4 is connected to an end 6 of the chip U1, and a control end 2 of the single chip microcomputer U4 is connected to an end 6 of the chip U2.
Wherein, the model of singlechip U4 is: MSP430FR 6043.
Optionally, the operational amplification module includes an operational amplifier U3, the 3 terminal of the operational amplifier U3 is connected to the 4 terminal of the chip U2 through a capacitor C11, the 3 terminal of the operational amplifier U3 is further connected to one terminal of a resistor R14, the other terminal of the resistor R14 is connected to the capacitor C14, the other terminal of the capacitor C14 is grounded, the other terminal of the resistor R14 is further connected to one terminal of the resistor R15 and the resistor R13, the other terminal of the resistor R13 is connected to a power VCC, and the other terminal of the resistor R15 is grounded; operational amplifier's 4 ends are connected with resistance R6 one end, and the resistance R6 other end is connected with electric capacity C6 one end, and electric capacity C6 other end ground connection, operational amplifier's 4 ends still are connected with resistance R7 one end, and the resistance R7 other end is connected with operational amplifier's 1 end, and resistance R7's both ends still are connected with electric capacity C5's both ends, operational amplifier's 6 ends are connected with electric capacity C7 one end, electric capacity C11 one end and power VCC respectively, electric capacity C7 other end and electric capacity C11 other end are connected the back ground connection, operational amplifier 5 ends are connected with singlechip U4's control end RXEN.
The capacitor C11 is a blocking capacitor, the capacitance value is 1uf, the resistance value of the resistor R14 is 24.9K, the resistance value of the resistor R15 is 2.00M, the resistance value of the resistor R13 is 2.00M, the capacitance value of the capacitor C14 is 2.2uf, the resistance value of the resistor R7 is 1.82K, the resistance value of the resistor R6 is 10.0, the capacitance value of the capacitor C5 is 33pf, and the capacitance value of the capacitor C6 is 1 uf.
Optionally, the impedance matching module includes a resistor R4 and a capacitor C4 respectively connected to the 4 ends of the chip U1, and a resistor R5 connected to the 4 ends of the chip U2, the resistor R4 is further connected to the pulse excitation, the other end of the capacitor C4 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the capacitor C3, one end of the resistor R3, and one end of the resistor R2, the other end of the capacitor C3, the other end of the resistor R3, and the other end of the resistor R2 are grounded, and the resistor R5 is also grounded.
The resistor R4 and the resistor R5 have impedance isolation, the resistance of the resistor R4 is 806, and the resistance of the resistor R5 is 806.
Optionally, the output module includes a resistor R9, one end of the resistor R9 is connected to the end 1 of the operational amplifier, the other end of the resistor R9 is connected to one end of a capacitor C12 and one end of a capacitor C10, the other end of the capacitor C12 is grounded, and the other end of the capacitor C10 is connected to an AD sampling end of the single chip microcomputer U4.
The resistor R9 and the capacitor C12 can increase an alternating current load, and the capacitor C12 is used for isolating direct current signals and improving the transmission efficiency of the signals.
The resistor R9 is 499 resistor, the capacitance of the capacitor C12 is 680pF, and the capacitance of the capacitor C10 is 1000 pF.
The working principle of this embodiment is the same as that of embodiment 2.
Claims (10)
1. An ultrasonic gas meter signal processing circuit is characterized by comprising an operational amplifier U3, a sensor J1, a sensor J2, a chip U1, a chip U2, a singlechip U4 and an impedance matching circuit, wherein the sensor J1 and the sensor J2 are connected with a chip U1 and a chip U2, the chip U1 is further connected with a capacitor C4 and a singlechip U4, the chip U2 is further connected with a singlechip U4 and an operational amplifier U3, the operational amplifier U3 is further connected with the singlechip U4, and the operational amplifier U3 is further connected with a resistor R6 and a capacitor C6 which are connected in series with each other and a resistor R7 and a capacitor C5 which are connected with each other;
the impedance matching circuit comprises a capacitor C4, a resistor R1 connected with the capacitor C4 in series, and a capacitor C3, a resistor R2 and a resistor R3 which are respectively connected with the capacitor C4 in parallel, wherein the capacitor C4 is connected with the chip U1.
2. The ultrasonic gas meter signal processing circuit according to claim 1, wherein the ultrasonic gas meter signal processing circuit further includes:
the voltage division filter circuit comprises a resistor R14 connected with an operational amplifier U3, a capacitor C14 connected in parallel with the resistor R14, a resistor R15 and a resistor R13.
3. The ultrasonic gas meter signal processing circuit according to claim 1, wherein the ultrasonic gas meter signal processing circuit further includes:
the power supply decoupling circuit comprises a capacitor C13 and a capacitor C7 which are connected to the operational amplifier U3 in an interconnecting mode.
4. The ultrasonic gas meter signal processing circuit according to claim 1, further comprising a resistor R4 and a resistor R5, wherein the resistor R4 is connected to a capacitor C4, and wherein the resistor R5 is connected to a chip U2.
5. An ultrasonic gas meter signal processing system is characterized by comprising an input module, a first sensor module, a second sensor module, a main control module, an operational amplification module, an impedance matching module and an output module;
the input module is in pulse excitation and is used for controlling the first sensor module or the second sensor module to send out ultrasonic signals;
the first sensor module is connected with the input module and used for sending an ultrasonic signal to the second sensor module, and the second sensor module is in a signal receiving state;
the second sensor module and the input module are used for sending ultrasonic signals to the first sensor module, and the first sensor module is in a signal receiving state;
the main control module is respectively connected with the first sensor module, the second sensor module and the operational amplification module and is used for controlling the first sensor module to send an ultrasonic signal to the second sensor module or the second sensor module to send an ultrasonic signal to the first sensor module and controlling the input of a received signal to the operational amplifier;
the operation amplification module is connected with the first sensor module or the second sensor module and is used for amplifying the ultrasonic signals sent by the first sensor module or the ultrasonic signals sent by the second sensor module;
the impedance matching module is connected with the first sensor module and the second sensor module and is used for adjusting the impedance of the operational amplification module to be the same as the impedance of the first sensor module and the impedance of the second sensor module;
and the output module is connected with the operational amplification module and the main control module and is used for transmitting the waveform signal amplified by the operational amplification module to the main control module.
6. The ultrasonic gas meter signal processing system as claimed in claim 5, wherein the first sensor module comprises a sensor J1 and a chip U1, the second sensor module comprises a sensor J2 and a chip U2, one end of the sensor J1 is connected to ground, the other end is connected to the 3 terminal of the chip U1 and the 1 terminal of the chip U2, the 5 terminal of the chip U1 is connected to VCC, the 2 terminal of the chip U1 is connected to ground, and the 4 terminal of the chip U1 is an ultrasonic signal output terminal; sensor J2's one end ground connection, the other end and chip U1's 1 end and chip U2's 3 end connection, chip U2's 5 end is connected with the power VCC, and chip U2's 2 end ground connection, chip U2's 4 ends are ultrasonic signal output end, chip U1's 5 end still is connected the back ground connection with electric capacity C1, chip U2's 5 end still is connected the back ground connection with electric capacity C2.
7. The ultrasonic gas meter signal processing system of claim 6, wherein the main control module comprises a single chip microcomputer U4, a control end EN1 of the single chip microcomputer U4 is connected with a 6 end of a chip U1, and a control end EN2 of the single chip microcomputer U4 is connected with a 6 end of a chip U2.
8. The ultrasonic gas meter signal processing system according to claim 7, wherein the operational amplification module includes an operational amplifier U3, a terminal 3 of the operational amplifier U3 is connected to a terminal 4 of a chip U2 through a capacitor C11, a terminal 3 of the operational amplifier U3 is further connected to one terminal of a resistor R14, the other terminal of the resistor R14 is connected to a capacitor C14, the other terminal of the capacitor C14 is grounded, the other terminal of the resistor R14 is further connected to one terminal of a resistor R13 and a resistor R15, the other terminal of the resistor R13 is connected to a power VCC, and the other terminal of the resistor R15 is grounded; operational amplifier's 4 ends are connected with resistance R6 one end, and the resistance R6 other end is connected with electric capacity C6 one end, and the electric capacity C6 other end is ground, and operational amplifier's 4 ends still are connected with resistance R7 one end, and the resistance R7 other end is connected with operational amplifier's 1 end, and resistance R7's both ends still are connected with electric capacity C5's both ends, operational amplifier's 6 ends are connected with electric capacity C7 one end, electric capacity C11 one end and power VCC respectively, the electric capacity C7 other end is connected the back ground connection with the electric capacity C11 other end, operational amplifier 5 ends are connected with singlechip U4's control end EN 3.
9. The ultrasonic gas meter signal processing system according to claim 8, wherein the impedance matching module includes a resistor R4 and a capacitor C4 respectively connected to the 4 terminals of the chip U1, and a resistor R5 connected to the 4 terminals of the chip U2, the resistor R4 is further connected to pulse excitation, the other terminal of the capacitor C4 is connected to one terminal of the resistor R1, the other terminal of the resistor R1 is connected to one terminal of the capacitor C3, one terminal of the resistor R3, and one terminal of the resistor R2, the other terminal of the capacitor C3, the other terminal of the resistor R3, and the other terminal of the resistor R2 are respectively grounded, and the resistor R5 is further grounded.
10. The ultrasonic gas meter signal processing system as claimed in claim 9, wherein the output module includes a resistor R9, one end of the resistor R9 is connected to the 1 end of the operational amplifier, the other end of the resistor R9 is connected to one end of a capacitor C12 and one end of a capacitor C10, respectively, the other end of the capacitor C12 is grounded, and the other end of the capacitor C10 is connected to an AD sampling end of a single-chip microcomputer U4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022512107.8U CN213120676U (en) | 2020-11-03 | 2020-11-03 | Ultrasonic gas meter signal processing circuit and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022512107.8U CN213120676U (en) | 2020-11-03 | 2020-11-03 | Ultrasonic gas meter signal processing circuit and system |
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| CN213120676U true CN213120676U (en) | 2021-05-04 |
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