CN113252146B - Intelligent flow velocity simulation system - Google Patents
Intelligent flow velocity simulation system Download PDFInfo
- Publication number
- CN113252146B CN113252146B CN202110522076.0A CN202110522076A CN113252146B CN 113252146 B CN113252146 B CN 113252146B CN 202110522076 A CN202110522076 A CN 202110522076A CN 113252146 B CN113252146 B CN 113252146B
- Authority
- CN
- China
- Prior art keywords
- flow
- flow velocity
- water meter
- electromagnetic water
- analog switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004088 simulation Methods 0.000 title claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 230000006698 induction Effects 0.000 claims abstract description 29
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The application relates to an intelligent flow rate simulation system, wherein the system comprises: the device comprises a flow velocity induction voltage output unit, a flow velocity direction switching unit and a noise signal simulation unit; the flow velocity induction voltage output unit is connected with the electromagnetic water meter converter, and converts exciting current generated by the electromagnetic water meter converter into induction voltage corresponding to the flow velocity and outputs the induction voltage; the input end of the flow velocity direction switching unit is connected with the output end of the flow velocity induction voltage output unit, the output end of the flow velocity direction switching unit is connected with the input end of the electromagnetic water meter converter, and the flow direction of the induction voltage signal is controlled through the flow velocity direction switching unit; the noise signal simulation unit comprises a noise signal generator, wherein the GND of the noise signal generator is connected with the simulation ground port of the electromagnetic water meter converter, the output end of the noise generator is connected with the GND of the intelligent flow velocity simulation system, and the noise signal generator simulates common-mode noise signals to be input into the simulation ground end of the electromagnetic water meter converter. The reliability of the converter is improved.
Description
Technical Field
The application relates to the field of electromagnetic water meters, in particular to an intelligent flow rate simulation system.
Background
The current electromagnetic flowmeter in the markets at home and abroad has uneven performance, and is particularly obvious for electromagnetic water meter products with low power consumption, high precision and wide range. The working principle of the electromagnetic water meter and the electromagnetic flowmeter technology are based on Faraday's law of electromagnetic induction, when uniform conductive liquid passes through a uniform and constant magnetic field, induced electromotive force is generated on an electrode contacted with the liquid at the boundary of a flow field, and the average flow velocity of the conductive liquid is calculated through the measured induced electromotive force. The electromagnetic water meter or the electromagnetic flowmeter structurally consists of a sensor and a converter, wherein the sensor is arranged on a pipeline to sense flow signals; the converter amplifies the flow signal sent by the sensor and converts the flow signal into a standard signal for display and calculation. Thus, the accuracy of an electromagnetic meter depends on the two parts. However, since the electromagnetic water meter generally adopts weak current excitation to meet the requirement of low power consumption, the measured induced electromotive force signal is extremely weak, which puts very strict requirements on designing a high-performance converter.
In order to meet the high performance requirements of the converter, in the related art, real-flow testing is generally used for calibration, however, since the calibration result may include uncertainty factors in the pipeline and the sensor, a common method is to generate an induced voltage by using an electromagnetic flowmeter signal source, so as to adjust or calibrate the converter. However, although the signal generator of the conventional electromagnetic flowmeter can generate continuous weak voltage signals, certain deviation exists between the signal generator and the phase of the excitation signal, and the problems of impedance rise, impedance asymmetry and the like caused by corrosion of the sensor electrode cannot be simulated.
At present, no effective solution is proposed for the problems of inaccurate calibration and detection and insufficient noise interference resistance of the converter in the related art.
Disclosure of Invention
The embodiment of the application provides an intelligent flow rate simulation system, which at least solves the problems of inaccurate calibration and detection and insufficient noise interference resistance of a converter in the related art.
In a first aspect, an embodiment of the present application provides an intelligent flow rate simulation system for calibrating a transducer of an electromagnetic water meter, the system comprising: a flow velocity induction voltage output unit, a flow velocity direction switching unit and a noise signal simulation unit,
The flow velocity induction voltage output unit is connected with the electromagnetic water meter converter, and converts exciting current generated by the electromagnetic water meter converter into induction voltage corresponding to the flow velocity and outputs the induction voltage;
the input end of the flow velocity direction switching unit is connected with the output end of the flow velocity induction voltage output unit, the output end of the flow velocity direction switching unit is connected with the input end of the electromagnetic water meter converter, and the flow direction of the induction voltage signal is controlled through the flow velocity direction switching unit;
the noise signal simulation unit comprises a noise signal generator, wherein the GND of the noise signal generator is connected with the simulation ground port of the electromagnetic water meter converter, the output end of the noise generator is connected with the GND of the intelligent flow velocity simulation system, and the noise signal generator simulates common-mode noise signals to be input into the simulation ground end of the electromagnetic water meter converter.
In some embodiments, the flow rate sensing voltage output unit comprises a precision inductance network, a resistance network, an operational amplifier, a selection switch, a high flow rate digital potentiometer, a low flow rate digital potentiometer, a follower and an inverting amplification circuit, wherein the selection switch comprises a first selection switch and a second selection switch.
In some embodiments, the precision inductance network is connected with the resistance network, and is used for converting the input exciting current into an induced voltage initial signal, wherein the precision inductance network is used for simulating the switching time of a coil, and the resistance network is used for current sampling of the exciting current.
In some embodiments, the system further comprises a single chip microcomputer, the single chip microcomputer is connected with the high flow rate digital potentiometer and the low flow rate digital potentiometer,
The input end of the operational amplifier is connected with the resistor network, amplifies and outputs the induced voltage initial signal, and inputs the induced voltage initial signal into the high-flow-rate digital potentiometer or the low-flow-rate digital potentiometer through the first selection switch;
The singlechip sets the flow speed through serial port output signals, and the high-flow-speed digital potentiometer and the low-flow-speed digital potentiometer divide the input induced voltage signals through the set flow speed adjusting resistor network.
In some of these embodiments, the follower comprises a first follower, a second follower,
The first follower is connected with the low-flow-rate digital potentiometer, the second follower is connected with the high-flow-rate digital potentiometer, and the first follower or the second follower inputs the divided induced voltage signal into the reverse amplifying circuit through the second selection switch, and the induced voltage corresponding to the set flow rate is output.
In some of these embodiments, the flow rate direction switching unit includes: an analog switch, a fourth selection switch, a high impedance mode, and a low impedance mode, wherein the analog switch includes a first analog switch, a second analog switch, a third analog switch, and a fourth analog switch,
The singlechip is connected with the third analog switch and the fourth analog switch, and controls the conduction direction of the third analog switch and the fourth analog switch through digital signals to switch the flow speed direction of the induced voltage signals;
The third analog switch is connected with the high-impedance mode and the low-impedance mode, and the induced voltage signal is led into the input end of the electromagnetic water meter converter through the first analog switch after being processed through the high-impedance mode or the low-impedance mode;
the fourth analog switch is connected with the high-impedance mode and the low-impedance mode, and the induced voltage signal is led into the input end of the electromagnetic water meter converter through the second analog switch after being processed through the high-impedance mode or the low-impedance mode.
In some embodiments, the second analog switch is connected to the fourth selection switch, and a differential mode signal is input to the input terminal of the electromagnetic water meter converter through the fourth selection switch.
In some embodiments, the singlechip is connected with the noise signal generator, and controls the noise signal generator to generate various common-mode noise signals with specified frequency and amplitude, and the common-mode noise signals are input into the analog ground terminal of the electromagnetic water meter converter.
In some of these embodiments, the noise signal simulation unit further comprises: a third selection switch is provided for selecting the first selection switch,
The third selection switch is connected with the noise signal generator, and differential mode signals are input to the input end of the electromagnetic water meter converter through the third selection switch and the fourth selection switch.
In some of these embodiments, the system further comprises: a power supply unit, which is connected with the power supply unit,
The power supply unit comprises an LDO and a buck chip, and supplies power for the singlechip and the system through the LDO and the buck chip.
Compared with the related art, the intelligent flow rate simulation system provided by the embodiment of the application is used for calibrating a converter of an electromagnetic water meter, and comprises the following components: the device comprises a flow velocity induction voltage output unit, a flow velocity direction switching unit and a noise signal simulation unit; the flow velocity induction voltage output unit is connected with the electromagnetic water meter converter, and converts the first exciting current and the second exciting current generated by the electromagnetic water meter converter into induction voltages corresponding to the flow velocity and outputs the induction voltages; the input end of the flow velocity direction switching unit is connected with the output end of the flow velocity induction voltage output unit, the output end of the flow velocity direction switching unit is connected with the input end of the electromagnetic water meter converter, and the flow direction of the induction voltage signal is controlled through the flow velocity direction switching unit; the noise signal simulation unit comprises a noise signal generator, wherein the GND of the noise signal generator is connected with the simulation ground port of the electromagnetic water meter converter, the output end of the noise generator is connected with the GND of the intelligent flow velocity simulation system, and the noise signal generator simulates common-mode noise signals to be input into the simulation ground end of the electromagnetic water meter converter.
Compared with the traditional flow rate simulator, the intelligent flow rate simulation system provided by the application can simulate the phase delay phenomenon of signals caused by the switching time of a real coil, can simulate noise signals under real working conditions, and can simulate the problems of impedance rise, impedance asymmetry and the like of a sensor electrode caused by corrosion, so that the capability of an electromagnetic water meter converter for resisting various possible problems can be helped to be detected, the calibration and detection accuracy of the converter can be improved, and the reliability of the converter can be improved. In addition, the circuit mostly adopts an operational amplifier with large input impedance and small output impedance, and meanwhile, the circuit is matched with components such as a resistor, a digital potentiometer and the like with very small zero drift and high precision, so that the stability and the integrity of signals are ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a block diagram of an intelligent flow rate simulation system according to an embodiment of the present application;
Fig. 2 is a schematic circuit configuration diagram of a flow rate sensing voltage output unit according to an embodiment of the present application;
fig. 3 is a schematic circuit configuration diagram of a flow rate direction switching unit according to an embodiment of the present application;
fig. 4 is a schematic circuit configuration diagram of a noise signal simulation unit according to an embodiment of the present application;
Fig. 5 is a schematic circuit configuration diagram of a power supply unit according to an embodiment of the present application.
Detailed Description
The present application will be described and illustrated with reference to the accompanying drawings and examples in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. All other embodiments, which can be made by a person of ordinary skill in the art based on the embodiments provided by the present application without making any inventive effort, are intended to fall within the scope of the present application. Moreover, it should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as having the benefit of this disclosure.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly and implicitly understood by those of ordinary skill in the art that the described embodiments of the application can be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "a," "an," "the," and similar referents in the context of the application are not to be construed as limiting the quantity, but rather as singular or plural. The terms "comprising," "including," "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to only those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in connection with the present application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein means greater than or equal to two. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. The terms "first," "second," "third," and the like, as used herein, are merely distinguishing between similar objects and not representing a particular ordering of objects.
The application provides an intelligent flow rate simulation system, which is used for calibrating a converter of an electromagnetic water meter, and fig. 1 is a structural block diagram of the intelligent flow rate simulation system according to an embodiment of the application, and as shown in fig. 1, the system comprises a flow rate induction voltage output unit 11, a flow rate direction switching unit 12 and a noise signal simulation unit 13. In addition, the system also comprises a singlechip and a power supply unit;
The flow velocity induction voltage output unit 11 is connected with the electromagnetic water meter converter, and converts exciting current generated by the electromagnetic water meter converter into induction voltage corresponding to the flow velocity and outputs the induction voltage; fig. 2 is a schematic circuit diagram of a flow rate sensing voltage output unit according to an embodiment of the present application, and as shown in fig. 2, the flow rate sensing voltage output unit 11 includes precision inductance networks L1 and L2, a resistor network, an operational amplifier U1, a selection switch, a high flow rate digital potentiometer DPOT1, a low flow rate digital potentiometer DPOT2, a follower, and an inverting amplification circuit U4, wherein the selection switch includes a first selection switch SW1 and a second selection switch SW2, and the follower includes a first follower U3 and a second follower U2.
Preferably, the flow rate induced voltage output unit 11 operates according to the following principle:
The precision inductance networks L1 and L2 are connected with the resistance network, exciting current generated and input by the electromagnetic water meter converter is converted into an induced voltage initial signal through the precision inductance network and the resistance network, the induced voltage initial signal has the same phase and frequency as an induced voltage signal generated by a real sensor, the precision inductance network is used for simulating a phase delay phenomenon of the signal caused by the switching time of a coil, and the resistance network is used for sampling the exciting current; optionally, the precise inductance networks L1, L2 may be replaced by coils;
the input end of the operational amplifier U1 is connected with a resistor network, the induced voltage initial signal is amplified and output through the precise operational amplifier U1 with high impedance input and low impedance output, and the amplified induced voltage initial signal enters the high-flow-rate digital potentiometer DPOT1 or the low-flow-rate digital potentiometer DPOT2 through a flow-rate range selection switch, namely a first selection switch SW 1;
The single chip microcomputer is respectively connected with the high-flow-rate digital potentiometer DPOT1 and the low-flow-rate digital potentiometer DPOT2, the single chip microcomputer sets the flow rate through serial port output signals, the high-flow-rate digital potentiometer DPOT1 and the low-flow-rate digital potentiometer DPOT2 adjust corresponding resistor networks through the set flow rates, and the input induced voltage signals are divided according to a voltage division principle; alternatively, the digital potentiometers DPOT1, DPOT2 may be replaced with analog resistors;
Because the signal amplitude is extremely weak, especially when the set flow rate is in a small flow rate range, the signal amplitude is generally only about a few microvolts, so that in order to ensure the integrity and stability of signal output, the induced voltage processed by the high-flow-rate digital potentiometer DPOT1 enters the first follower U3 or the induced voltage processed by the low-flow-rate digital potentiometer DPOT2 enters the second follower U2, and the divided induced voltage signal is input into the reverse amplification circuit U4 with adjustable gain through the selection of the second selection switch SW2, and finally the induced voltage signal Sig1 corresponding to the set flow rate is output. In the embodiment, two digital potentiometers are utilized to realize simulation of different flow rate ranges, wherein the resolution of the adjustable flow rate is 0.005m/s. In addition, the signal quality can be effectively improved by adopting a follower and an inverting amplifier with adjustable gain.
Further, an input end of the flow velocity direction switching unit 12 is connected with an output end of the flow velocity induced voltage output unit 11, an output end of the flow velocity direction switching unit 12 is connected with an input end of the electromagnetic water meter converter, and a flow direction of the induced voltage signal is controlled through the flow velocity direction switching unit 12; fig. 3 is a schematic circuit configuration diagram of a flow rate direction switching unit according to an embodiment of the present application, and as shown in fig. 3, the flow rate direction switching unit 12 includes: the high-impedance switch comprises an analog switch, a fourth selection switch SW4, a high-impedance mode and a low-impedance mode, wherein the analog switch comprises a first analog switch, a second analog switch, a third analog switch and a fourth analog switch.
Preferably, the flow velocity direction switching unit 12 operates on the following principle:
the induced voltage signal Sig1 output from the flow-rate induced voltage output unit 11 is input into the flow-rate direction switching unit 12, the singlechip is respectively connected with the third analog switch and the fourth analog switch, and the singlechip controls the conduction directions of the third analog switch and the fourth analog switch through digital signals, so that the flow-rate direction switching of the induced voltage signal is realized;
In this embodiment, the output path of the signal Sig1 can be adjusted by switching the third analog switch and the fourth analog switch, so as to achieve the problem of impedance variation of the analog electrode. Specifically, the third analog switch is connected with a high-impedance mode and a low-impedance mode, and the induced voltage signal Sig1 is processed in the high-impedance mode or the low-impedance mode and then is led into the input end E1 of the electromagnetic water meter converter through the first analog switch; or the fourth analog switch is connected with the high impedance mode and the low impedance mode, and the induced voltage signal Sig1 is processed by the high impedance mode or the low impedance mode and then is led into the input end E2 of the electromagnetic water meter converter by the second analog switch. The electrode model is built, the low-impedance and high-impedance signal output modes are simulated, and the single chip microcomputer is used for selecting the high-impedance and low-impedance modes, so that the aims of simulating problems of rising impedance, asymmetry impedance and the like of the sensor electrode caused by corrosion are fulfilled, and the capability of the converter for resisting the problems can be helped to be detected.
In some embodiments, the second analog switch is connected to a fourth selection switch SW4, and as shown in fig. 3, the fourth selection switch SW4 is used to input a differential mode signal to the input end E2 of the electromagnetic water meter converter, so as to generate differential mode noise.
Furthermore, the embodiment of the application has the characteristics of small temperature drift, strong stability, selectable output impedance and selectable flow direction, and also has the capability of simulating the influence of working condition noise on the flow speed signal. Specifically, the noise signal simulation unit 13 includes a noise signal generator, where GND of the noise signal generator is connected to an analog ground port of the electromagnetic water meter converter, and GND of the intelligent flow rate simulation system is connected to an output end of the noise signal generator, and fig. 4 is a schematic circuit diagram of the noise signal simulation unit according to an embodiment of the present application, as shown in fig. 4, as known from practical application of the electromagnetic water meter or the electromagnetic flowmeter, most of noise in the sensor belongs to a common mode signal, and in order to simulate superposition of the common mode noise signal and the flow rate signal, the noise signal simulation unit may be implemented by the circuit shown in fig. 4. In addition, the noise signal simulation unit 13 further comprises a third selection switch SW3, the output of the noise signal generator has a matched impedance with the GND of the flow rate simulator of the present system, and since the GND of the noise signal generator is connected to the analog ground port of the converter, it is ensured that the converter inputs E1, E2 can superimpose a common noise signal.
Preferably, the noise signal simulation unit 13 operates according to the following principle:
the singlechip is connected with the noise signal generator and controls the noise signal generator to generate various common-mode noise signals with specified frequency and amplitude, wherein the common-mode noise signals comprise: sinusoidal signals, trapezoidal signals, direct current signals, exponential function signals and the like, and the generated common-mode noise signals are input into an analog ground end of the electromagnetic water meter converter; it should be noted that the noise signal generator may be replaced by an external signal generator;
further, in order to simulate the differential mode noise in the wire, in this embodiment, the third selection switch SW3 and the fourth selection switch SW4 in fig. 3 are used to input the differential mode signal into the input end E2 of the electromagnetic water meter converter, so as to realize the generation of the differential mode noise signal;
Compared with the traditional flow rate simulator, the flow rate simulator can only simulate and output induced voltage signals, and can not realize noise signals under real working conditions. Based on the principle of common mode noise, the embodiment of the application superimposes various common mode noises on an induced voltage signal through the noise signal generator with the adjustable singlechip and inputs the superimposed common mode noises to the input end of the electromagnetic water meter converter. In addition, the same signal generating system is adopted, and the differential mode noise can be added into the input end of the converter by changing the analog switch, so that the simulation of the differential mode noise in the electromagnetic water meter under the actual working condition is realized.
Through the system, the upper computer selects the set flow speed, the flow direction and the impedance, a control instruction is sent to the singlechip through the serial port, the singlechip respectively adjusts the digital potentiometer, the analog switch, the selection switch and the like and the noise signal generator to corresponding numerical values, simulates various problems possibly generated when the flow speed is measured, helps to detect the capacity of the converter for resisting various noises, improves the production efficiency of a production line, and can improve the reliability of the produced converter.
In some embodiments, the power supply unit includes an LDO and a buck chip, and fig. 5 is a schematic circuit structure of the power supply unit according to an embodiment of the present application, and as shown in fig. 5, the power supply unit provides a stable voltage for the single chip microcomputer and the system through the LDO and the buck chip. Specifically, the independent power supply unit in this embodiment may be powered by a 3.6V-5V battery or a dc power supply.
It should be understood by those skilled in the art that the technical features of the above-described embodiments may be combined in any manner, and for brevity, all of the possible combinations of the technical features of the above-described embodiments are not described, however, they should be considered as being within the scope of the description provided herein, as long as there is no contradiction between the combinations of the technical features.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (7)
1. An intelligent flow rate simulation system for calibrating a transducer of an electromagnetic water meter, the system comprising: a flow velocity induction voltage output unit, a flow velocity direction switching unit, a noise signal simulation unit and a singlechip,
The flow velocity induction voltage output unit is connected with the electromagnetic water meter converter, and converts exciting current generated by the electromagnetic water meter converter into induction voltage corresponding to the flow velocity and outputs the induction voltage;
The flow speed induction voltage output unit comprises a precise inductance network, a resistance network, an operational amplifier, a selection switch, a high flow speed digital potentiometer, a low flow speed digital potentiometer, a follower and a reverse amplification circuit, wherein the selection switch comprises a first selection switch and a second selection switch;
the precise inductance network is connected with the resistance network and is used for converting the input exciting current into an induced voltage initial signal, wherein the precise inductance network is used for simulating the switching time of a coil, and the resistance network is used for current sampling of the exciting current;
The input end of the flow velocity direction switching unit is connected with the output end of the flow velocity induction voltage output unit, the output end of the flow velocity direction switching unit is connected with the input end of the electromagnetic water meter converter, and the flow direction of the induction voltage signal is controlled through the flow velocity direction switching unit;
The flow velocity direction switching unit includes: an analog switch, a fourth selection switch, a high impedance mode, and a low impedance mode, wherein the analog switch includes a first analog switch, a second analog switch, a third analog switch, and a fourth analog switch,
The singlechip is connected with the third analog switch and the fourth analog switch, and controls the conduction direction of the third analog switch and the fourth analog switch through digital signals to switch the flow speed direction of the induced voltage signals;
The third analog switch is connected with the high-impedance mode and the low-impedance mode, and the induced voltage signal is led into the input end of the electromagnetic water meter converter through the first analog switch after being processed through the high-impedance mode or the low-impedance mode;
The fourth analog switch is connected with the high-impedance mode and the low-impedance mode, and the induced voltage signal is led into the input end of the electromagnetic water meter converter through the second analog switch after being processed through the high-impedance mode or the low-impedance mode;
The noise signal simulation unit comprises a noise signal generator, wherein the GND of the noise signal generator is connected with the simulation ground port of the electromagnetic water meter converter, the output end of the noise signal generator is connected with the GND of the intelligent flow velocity simulation system, and the noise signal generator simulates common-mode noise signals to be input into the simulation ground end of the electromagnetic water meter converter.
2. The system of claim 1, wherein the single-chip microcomputer is connected with the high-flow-rate digital potentiometer and the low-flow-rate digital potentiometer,
The input end of the operational amplifier is connected with the resistor network, amplifies and outputs the induced voltage initial signal, and inputs the induced voltage initial signal into the high-flow-rate digital potentiometer or the low-flow-rate digital potentiometer through the first selection switch;
The singlechip sets the flow speed through serial port output signals, and the high-flow-speed digital potentiometer and the low-flow-speed digital potentiometer divide the input induced voltage signals through the set flow speed adjusting resistor network.
3. The system of claim 2, wherein the follower comprises a first follower, a second follower,
The first follower is connected with the low-flow-rate digital potentiometer, the second follower is connected with the high-flow-rate digital potentiometer, and the first follower or the second follower inputs the divided induced voltage signal into the reverse amplifying circuit through the second selection switch, and the induced voltage corresponding to the set flow rate is output.
4. The system of claim 3, wherein the system further comprises a controller configured to control the controller,
The second analog switch is connected with the fourth selection switch, and a differential mode signal is input to the input end of the electromagnetic water meter converter through the fourth selection switch.
5. The system of claim 3, wherein the system further comprises a controller configured to control the controller,
The singlechip is connected with the noise signal generator, controls the noise signal generator to generate various common-mode noise signals with specified frequency and amplitude, and inputs the common-mode noise signals into the analog ground end of the electromagnetic water meter converter.
6. The system of claim 4 or 5, wherein the noise signal simulation unit further comprises: a third selection switch is provided for selecting the first selection switch,
The third selection switch is connected with the noise signal generator, and differential mode signals are input to the input end of the electromagnetic water meter converter through the third selection switch and the fourth selection switch.
7. The system of claim 2, wherein the system further comprises: a power supply unit, which is connected with the power supply unit,
The power supply unit comprises an LDO and a buck chip, and supplies power for the singlechip and the system through the LDO and the buck chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110522076.0A CN113252146B (en) | 2021-05-13 | 2021-05-13 | Intelligent flow velocity simulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110522076.0A CN113252146B (en) | 2021-05-13 | 2021-05-13 | Intelligent flow velocity simulation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113252146A CN113252146A (en) | 2021-08-13 |
| CN113252146B true CN113252146B (en) | 2024-05-10 |
Family
ID=77181658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110522076.0A Active CN113252146B (en) | 2021-05-13 | 2021-05-13 | Intelligent flow velocity simulation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113252146B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5200682A (en) * | 1990-08-14 | 1993-04-06 | Samsung Electronics Co., Ltd. | Motor current phase delay compensating method and apparatus thereof |
| JPH0693620B2 (en) * | 1985-04-08 | 1994-11-16 | 株式会社日立製作所 | Analog switch circuit |
| JPH07200147A (en) * | 1993-12-28 | 1995-08-04 | Pentel Kk | Device and method for noise-resisting capacitive coupling coordinate detection |
| CN101216339A (en) * | 2008-01-18 | 2008-07-09 | 天津天仪集团仪表有限公司 | Electromagnetic flux converter simulated calibration apparatus |
| JP2012247311A (en) * | 2011-05-27 | 2012-12-13 | Yokogawa Electric Corp | Electromagnetic flowmeter |
| CN103115656A (en) * | 2013-03-06 | 2013-05-22 | 深圳市理邦精密仪器股份有限公司 | Method and device for detecting position of fluid channel |
| CN205483103U (en) * | 2015-12-30 | 2016-08-17 | 天津市迅尔自控设备制造有限公司 | Electromagnetic flow converter |
| DE102016122914A1 (en) * | 2015-11-30 | 2017-06-01 | Analog Devices Global | Interface for an electromagnetic flow sensor with sensor drive circuit |
| CN108020280A (en) * | 2017-11-20 | 2018-05-11 | 重庆川仪自动化股份有限公司 | Unstable signal processing method under the conditions of electromagnetic flowmeter high frequency excitation |
-
2021
- 2021-05-13 CN CN202110522076.0A patent/CN113252146B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0693620B2 (en) * | 1985-04-08 | 1994-11-16 | 株式会社日立製作所 | Analog switch circuit |
| US5200682A (en) * | 1990-08-14 | 1993-04-06 | Samsung Electronics Co., Ltd. | Motor current phase delay compensating method and apparatus thereof |
| JPH07200147A (en) * | 1993-12-28 | 1995-08-04 | Pentel Kk | Device and method for noise-resisting capacitive coupling coordinate detection |
| CN101216339A (en) * | 2008-01-18 | 2008-07-09 | 天津天仪集团仪表有限公司 | Electromagnetic flux converter simulated calibration apparatus |
| JP2012247311A (en) * | 2011-05-27 | 2012-12-13 | Yokogawa Electric Corp | Electromagnetic flowmeter |
| CN103115656A (en) * | 2013-03-06 | 2013-05-22 | 深圳市理邦精密仪器股份有限公司 | Method and device for detecting position of fluid channel |
| DE102016122914A1 (en) * | 2015-11-30 | 2017-06-01 | Analog Devices Global | Interface for an electromagnetic flow sensor with sensor drive circuit |
| CN205483103U (en) * | 2015-12-30 | 2016-08-17 | 天津市迅尔自控设备制造有限公司 | Electromagnetic flow converter |
| CN108020280A (en) * | 2017-11-20 | 2018-05-11 | 重庆川仪自动化股份有限公司 | Unstable signal processing method under the conditions of electromagnetic flowmeter high frequency excitation |
Non-Patent Citations (2)
| Title |
|---|
| Study on the Mechanism of Excitation Switching Process in Electromagnetic Flowmeter to Overcome Slurry Noise;Bin Li; Xinghang Fan; Jie Chen; Junfeng Xu;《IEEE Sensors Journal》;第21卷(第7期);9023 - 9037 * |
| 王勇 ; 赵宇琪 ; 董亮 ; 代翠 ; 刘厚林 ; 徐海良 .基于流声耦合法的超低比转数离心泵空化特性研究.《农业机械学报》.2017,114-123. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113252146A (en) | 2021-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102169139B (en) | Independently packaged ammeter sensor | |
| CN102305885B (en) | Isolation type voltage sensor | |
| CN204613137U (en) | Air-anion concentration detector | |
| CN207703359U (en) | A kind of acquisition of multichannel thermistor temp and processing unit | |
| CN204101635U (en) | A kind of microresistivity survey instrument and electronic product process units | |
| RU2645834C1 (en) | Method and device for determining consumption in large diameter pipelines | |
| CN203133146U (en) | Transformer neutral point current measuring device | |
| CN207472443U (en) | Multichannel three-wire system resistance temperature measurement circuit | |
| CN103235189A (en) | High-precision micro resistor measurement method based on double-current voltage ratio method and measurement system for realizing method | |
| CN111198297A (en) | Signal acquisition device based on Rogowski coil and zero-flux current sensor | |
| CN113252146B (en) | Intelligent flow velocity simulation system | |
| CN202018478U (en) | Wide-range electric energy metering device for fluctuating load | |
| CN107505061A (en) | A kind of platinum resistance temperature measuring device in double-current source | |
| CN101788830B (en) | Digital temperature control circuit | |
| CN112229457A (en) | Novel electromagnetic flowmeter and measuring method thereof | |
| CN102478422A (en) | Zero drift simulation calibrating method and device thereof | |
| US11340272B2 (en) | Apparatus and method for determining a power value of a target | |
| CN206740271U (en) | A kind of temperature measuring circuit | |
| CN201421653Y (en) | Wireless data acquisition unit | |
| CN109655735A (en) | Power amplifier chips evaluation board and power amplifier chips evaluation board system | |
| CN206740279U (en) | A kind of pressure measurement circuitry | |
| CN208206211U (en) | A kind of eight pairs of electrode unlined electromagnetic flow transducers | |
| CN203929849U (en) | Current detection circuit in a kind of electronic type voltage transformer | |
| CN210005595U (en) | thermal resistance four-wire system real-time measuring circuit | |
| CN207280674U (en) | A kind of measuring circuit of vacuum instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Meng Yiqing Inventor after: Chen Wei Inventor after: Tan Long Inventor before: Meng Yiqing Inventor before: Chen Wei |
|
| CB03 | Change of inventor or designer information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |