CN213515815U - Built-in battery type electromagnetic flowmeter - Google Patents
Built-in battery type electromagnetic flowmeter Download PDFInfo
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- CN213515815U CN213515815U CN202022673709.1U CN202022673709U CN213515815U CN 213515815 U CN213515815 U CN 213515815U CN 202022673709 U CN202022673709 U CN 202022673709U CN 213515815 U CN213515815 U CN 213515815U
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- 238000001914 filtration Methods 0.000 claims abstract description 28
- 238000005070 sampling Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 23
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 abstract description 16
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000003321 amplification Effects 0.000 description 5
- 230000009123 feedback regulation Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model discloses a battery built-in electromagnetic flowmeter, including filtering and noise reduction circuit and amplitude limiting feedback regulating circuit, filtering and noise reduction circuit includes fortune ware AR1, fortune ware AR1 is used for amplifying the electromagnetic flow sensor inside the flowmeter, and export to the controller after making an uproar through RC-LC filter network, effectively filters the interference that external high frequency electromagnetic clutter brought to flow detection; the input end of the amplitude limiting feedback adjusting circuit is connected with the sampling end of the filtering noise reduction circuit and used for feeding back the amplitude-limiting amplified sampling signal to the in-phase input end of the operational amplifier AR1, so that the system error is reduced, and the flow detection precision is improved.
Description
Technical Field
The utility model relates to a flowmeter technical field especially relates to a built-in electromagnetic flowmeter of battery.
Background
The battery built-in electromagnetic flowmeter is a metering instrument specially designed for the actual requirements of water supply enterprises. The water supply and water consumption can be optimized and accurate water trade metering settlement can be ensured. The battery built-in electromagnetic flowmeter consists of an electromagnetic flow converter and an electromagnetic flow sensor, a sensor excitation system with special design and a high-performance lithium battery power supply system are adopted, and a 16-bit embedded ultramicro power consumption processor is adopted. Although the electromagnetic flowmeter with the built-in battery has good internal stability, the device is in a severe external environment for a long time and is greatly influenced by external temperature and electromagnetic interference factors, so that the fluctuation of flow detection signals is large, and the accuracy of water trade metering settlement is seriously influenced.
So the utility model provides a new scheme to solve the problem.
SUMMERY OF THE UTILITY MODEL
In view of the above situation, in order to overcome the defects of the prior art, the present invention is directed to an electromagnetic flowmeter with a built-in battery.
The technical scheme for solving the problem is as follows: the battery built-in electromagnetic flowmeter comprises a filtering noise reduction circuit and an amplitude limiting feedback regulation circuit, wherein the filtering noise reduction circuit comprises an operational amplifier AR1, the operational amplifier AR1 is used for amplifying an electromagnetic flow sensor inside the flowmeter and outputting the amplified electromagnetic flow sensor to a controller after noise reduction through an RC-LC filter network, and the input end of the amplitude limiting feedback regulation circuit is connected with the sampling end of the filtering noise reduction circuit and is used for feeding back a sampling signal to the in-phase input end of an operational amplifier AR1 after amplitude limiting and amplification.
Preferably, the filtering and noise reducing circuit further includes a resistor R1, one end of the resistor R1 is connected to the signal output end of the electromagnetic flow sensor, the other end of the resistor R1 is connected to the non-inverting input end of the operational amplifier AR1 and is grounded through a capacitor C1, the inverting input end of the operational amplifier AR1 is connected to one ends of the resistor R2 and the capacitor C2, the other end of the capacitor C2 is grounded, the other end of the resistor R2 is connected to one ends of the resistor R3 and the capacitor C3, the other end of the capacitor C3 is connected to one ends of the resistor R4 and the capacitor C4, the output end of the operational amplifier AR1 is connected to the other ends of the resistors R3, R4 and the capacitor C4 and is connected to one end of the inductor L1 and the sampling end of the filtering and noise reducing circuit through a resistor R5, and the other end of the inductor.
Preferably, the amplitude limiting feedback adjusting circuit comprises a rheostat RP1, pins 2 and 3 of the rheostat RP1 are connected with a sampling end of the filtering and noise reducing circuit, pin 1 of the rheostat RP1 is connected with an inverting input end of an operational amplifier AR2, one end of a resistor R7 and an anode of a zener diode DZ1 through a resistor R6, a non-inverting input end of the operational amplifier AR2 is grounded through a resistor R8, a cathode of the zener diode DZ1 is connected with a cathode of the zener diode DZ2, an anode of the zener diode DZ2 and the other end of the resistor R7 are connected with an output end of the operational amplifier AR2, and are connected with a non-inverting input end of the operational amplifier AR1 through a diode D1.
Preferably, the controller is a single chip microcomputer, and the single chip microcomputer is connected with an LCD display screen through a data bus.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the detection signal of the electromagnetic flow sensor is firstly sent into a filtering and noise reducing circuit for amplification and filtering, and a second-order RC filtering feedback network is utilized to play a good frequency selecting role in the detection signal in the operational amplification process, so that the interference of external high-frequency electromagnetic clutter on flow detection is effectively filtered;
2. the amplitude limiting feedback regulating circuit is designed to perform feedback regulation on the output signal of the operational amplifier AR1, and by utilizing the negative feedback closed loop regulation principle, the signal output waveform can be effectively improved when the detection signal fluctuates, the system error is reduced, and the flow detection precision is improved.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description taken in conjunction with the accompanying fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A battery built-in electromagnetic flowmeter comprises a filtering noise reduction circuit and an amplitude limiting feedback regulation circuit, wherein the filtering noise reduction circuit comprises an operational amplifier AR1, the operational amplifier AR1 is used for amplifying an electromagnetic flow sensor inside the flowmeter and outputting the amplified electromagnetic flow sensor to a controller after noise reduction through an RC-LC filter network, and the input end of the amplitude limiting feedback regulation circuit is connected with the sampling end of the filtering noise reduction circuit and used for feeding back a sampling signal to the in-phase input end of an operational amplifier AR1 after amplitude limiting and amplification.
The filtering and noise reducing circuit further comprises a resistor R1, one end of the resistor R1 is connected with a signal output end of the electromagnetic flow sensor, the other end of the resistor R1 is connected with a non-inverting input end of an operational amplifier AR1 and is grounded through a capacitor C1, an inverting input end of the operational amplifier AR1 is connected with one ends of a resistor R2 and a capacitor C2, the other end of a capacitor C2 is grounded, the other end of a resistor R2 is connected with one ends of a resistor R3 and a capacitor C3, the other end of a capacitor C3 is connected with one ends of a resistor R4 and a capacitor C4, an output end of an operational amplifier AR1 is connected with the other ends of a resistor R3, a resistor R4 and a capacitor C4 and is connected with one end of an inductor L1 and a sampling end of the filtering and noise reducing circuit through a resistor R5, and the other.
The amplitude limiting feedback adjusting circuit comprises a rheostat RP1, pins 2 and 3 of the rheostat RP1 are connected with a sampling end of the filtering and noise reducing circuit, a pin 1 of the rheostat RP1 is connected with an inverting input end of an operational amplifier AR2, one end of a resistor R7 and an anode of a voltage stabilizing diode DZ1 through a resistor R6, a non-inverting input end of the operational amplifier AR2 is grounded through a resistor R8, a cathode of the voltage stabilizing diode DZ1 is connected with a cathode of a voltage stabilizing diode DZ2, an anode of the voltage stabilizing diode DZ2 and the other end of the resistor R7 are connected with an output end of an operational amplifier AR2, and are connected with a non-inverting input end of an operational amplifier AR 89.
The utility model discloses when specifically using, the detected signal of electromagnetic flow sensor at first sends into the filtering and falls the circuit of making an uproar and enlarge, the filtering in, wherein, resistance R1 and electric capacity C1 form the RC filtering and carry out the low pass and fall the noise to electromagnetic flow sensor's output signal, then send into the fortune and put the ware AR1 in and enlarge. In the operational amplifier process, the resistors R3 and R4 and the capacitors C3 and C4 form a second-order RC filter feedback network, so that a good frequency selection effect is achieved on detection signals, and interference of external high-frequency electromagnetic noise on flow detection is effectively filtered.
In order to avoid the fluctuation of the flow detection signal caused by external factors, the amplitude limiting feedback adjusting circuit is designed to perform feedback adjustment on the output signal of the operational amplifier AR 1. The rheostat RP1 samples the current of the output signal of the operational amplifier AR1 and sends the sampled current to the operational amplifier AR2 for amplification, so that in order to avoid uncontrollable feedback quantity adjustment caused by large signal fluctuation, an amplitude limiting device formed by the voltage stabilizing diodes DZ1 and DZ2 is added at the feedback end of the operational amplifier AR2, and system imbalance caused by large feedback quantity is avoided. By utilizing a negative feedback closed-loop regulation principle, when the detection signal fluctuates, the signal output waveform can be effectively improved, the system error is reduced, and the flow detection precision is improved.
Finally, the detection signal after feedback adjustment is sent to an LC filter formed by an inductor L1 and a capacitor C5 for accurate filtering, and the accuracy of the detection result is greatly improved. When specifically setting up, the singlechip that has the AD conversion function is chooseed for use to the controller, and the singlechip carries out analog-to-digital conversion with LC filter's output signal and calculates the flow detection value, and the singlechip has the LCD display screen through data bus connection, shows on sending into the LCD display screen through with the testing result to acquire accurate water trade measurement settlement data.
The above description is provided for further details of the present invention with reference to the specific embodiments, which should not be construed as limiting the present invention; to the utility model discloses affiliated and relevant technical field's technical personnel are based on the utility model discloses under the technical scheme thinking prerequisite, the extension of doing and the replacement of operating method, data all should fall within the utility model discloses within the protection scope.
Claims (4)
1. The utility model provides a built-in electromagnetic flowmeter of battery, includes filtering and falls circuit of making an uproar and limit feedback control circuit, its characterized in that: the filtering and noise reducing circuit comprises an operational amplifier AR1, the operational amplifier AR1 is used for amplifying the electromagnetic flow sensor inside the flowmeter, reducing noise through an RC-LC filter network and outputting the noise to a controller, and the input end of the amplitude limiting feedback adjusting circuit is connected with the sampling end of the filtering and noise reducing circuit and used for feeding back the amplitude-limited and amplified sampling signals to the non-inverting input end of the operational amplifier AR 1.
2. The in-battery electromagnetic flowmeter of claim 1, wherein: the filtering and noise reducing circuit further comprises a resistor R1, one end of the resistor R1 is connected with a signal output end of the electromagnetic flow sensor, the other end of the resistor R1 is connected with a non-inverting input end of an operational amplifier AR1 and is grounded through a capacitor C1, an inverting input end of the operational amplifier AR1 is connected with one ends of a resistor R2 and a capacitor C2, the other end of a capacitor C2 is grounded, the other end of a resistor R2 is connected with one ends of a resistor R3 and a capacitor C3, the other end of a capacitor C3 is connected with one ends of a resistor R4 and a capacitor C4, an output end of an operational amplifier AR1 is connected with the other ends of a resistor R3, a resistor R4 and a capacitor C4 and is connected with one end of an inductor L1 and a sampling end of the filtering and noise reducing circuit through a resistor R5, and the other end.
3. The in-battery electromagnetic flowmeter of claim 2, wherein: the amplitude limiting feedback adjusting circuit comprises a rheostat RP1, pins 2 and 3 of the rheostat RP1 are connected with a sampling end of the filtering and noise reducing circuit, a pin 1 of the rheostat RP1 is connected with an inverting input end of an operational amplifier AR2, one end of a resistor R7 and an anode of a voltage stabilizing diode DZ1 through a resistor R6, a non-inverting input end of the operational amplifier AR2 is grounded through a resistor R8, a cathode of the voltage stabilizing diode DZ1 is connected with a cathode of a voltage stabilizing diode DZ2, an anode of the voltage stabilizing diode DZ2 and the other end of the resistor R7 are connected with an output end of an operational amplifier AR2, and are connected with a non-inverting input end of an operational amplifier AR 1.
4. The in-battery electromagnetic flowmeter of claim 3, wherein: the controller adopts a single chip microcomputer which is connected with an LCD display screen through a data bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022673709.1U CN213515815U (en) | 2020-11-18 | 2020-11-18 | Built-in battery type electromagnetic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022673709.1U CN213515815U (en) | 2020-11-18 | 2020-11-18 | Built-in battery type electromagnetic flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213515815U true CN213515815U (en) | 2021-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022673709.1U Active CN213515815U (en) | 2020-11-18 | 2020-11-18 | Built-in battery type electromagnetic flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213515815U (en) |
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2020
- 2020-11-18 CN CN202022673709.1U patent/CN213515815U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 475000 No. 1, north section of Hongda Avenue, Xiangfu District, Kaifeng City, Henan Province Patentee after: Kaifeng Kangbuda Instrument Co.,Ltd. Address before: 475000 east side of South section of Gongye Road, Huanglong Industrial Cluster, Kaifeng City, Henan Province Patentee before: Kaifeng Helishi industrial control instrument Co.,Ltd. |
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| CP03 | Change of name, title or address |