CN113253027A - Converter measuring circuit of electromagnetic water meter - Google Patents
Converter measuring circuit of electromagnetic water meter Download PDFInfo
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- CN113253027A CN113253027A CN202110523803.5A CN202110523803A CN113253027A CN 113253027 A CN113253027 A CN 113253027A CN 202110523803 A CN202110523803 A CN 202110523803A CN 113253027 A CN113253027 A CN 113253027A
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Abstract
The application relates to a converter measuring circuit of an electromagnetic water meter, wherein the converter measuring circuit of the electromagnetic water meter comprises an input end electrode, a front end amplifying circuit and an alternating current coupling circuit, the front-end amplifying circuit amplifies the induced electromotive force signal received by the input end electrode and outputs the amplified induced voltage signal, the low-frequency polarization voltage signal is extracted from the amplified induced voltage signal through the alternating current coupling circuit, and the low-frequency polarization voltage signal is input into the front-end amplifying circuit after inverse integration to counteract the polarization voltage, therefore, the filtering of the low-frequency polarization voltage signal is realized, the integrity and the real-time property of the useful signal are maintained, and because the converter measuring circuit of the electromagnetic water meter can adaptively filter out corresponding low-frequency polarization voltage signals, the applicability of the circuit is also improved, meanwhile, the problem of low system response speed caused by the use of traditional digital filtering or other analog filtering is solved.
Description
Technical Field
The application relates to the technical field of electromagnetism, especially relate to converter measuring circuit of electromagnetism water gauge.
Background
With the rapid development of electronic technology and computing technology, the application of electromagnetic water meters or electromagnetic flow meters is more and more extensive; the electromagnetic water meter or the electromagnetic flow meter realizes flow velocity measurement mainly according to the one-to-one correspondence relationship between induced electromotive force generated by the motion of a conductor cutting magnetic lines and the velocity of a measured fluid.
In the actual measurement process, the conductive fluid cuts a magnetic induction line in a uniform magnetic field to move, induced electromotive force is generated around the section of the fluid, and the induced voltage is calculated by a formula U = BDV (wherein U is induced electromotive force, B is magnetic field intensity, D is the inner diameter of a measuring tube, and V is liquid flowing speed) through a pair of contact type metal electrodes made of non-magnetic materials; the low-frequency polarization potential noise signal caused by electrode polarization only causes measurement inaccuracy, and an ADC (Analog-to-Digital converter) is saturated, so that the single chip microcomputer cannot normally perform flow velocity measurement and calculation. The existing method for solving the problem is to add a band-pass filter or a high-pass filter before entering an amplifying circuit, but the method has the capability of blocking direct current or low-frequency signals, and can also cause the attenuation of useful signals; if a high-pass filter with a large time constant is adopted, the system response is slowed, the phase of a signal is shifted, the signal is distorted, and the flow velocity measurement is inaccurate.
At present, no effective solution is provided for the problem of measurement inaccuracy caused by low-frequency polarization potential noise signals caused by electrode polarization in the related art.
Disclosure of Invention
The embodiment of the application provides a converter measuring circuit of an electromagnetic water meter, which is used for at least solving the problem of inaccurate measurement caused by electrode polarization in the related technology.
In a first aspect, an embodiment of the present application provides a converter measurement circuit of an electromagnetic water meter, including:
the input end electrode is used for receiving an induced electromotive force signal;
the front-end amplifying circuit is connected with the input end electrode and is used for amplifying the induced electromotive force signal and outputting an amplified induced voltage signal;
and the alternating current coupling circuit is connected with the front-end amplifying circuit and is used for extracting a low-frequency polarization voltage signal from the amplified induced voltage signal and inputting the low-frequency polarization voltage signal into the front-end amplifying circuit after inverting the phase of the low-frequency polarization voltage signal so as to offset the polarization voltage.
In some of these embodiments, the front-end amplification circuit is an operational amplifier or a differential amplification circuit.
In some embodiments, the operational amplifier has a reference pin for canceling the polarization voltage when the reference pin receives the inverted amplified low frequency polarization voltage signal and outputs a canceled amplified induced voltage signal.
In some of these embodiments, the ac coupling circuit includes:
the low-pass filter circuit is used for filtering out a high-frequency signal in the amplified induction voltage signal and outputting a low-frequency polarization voltage signal;
and the first inverse integration circuit is connected with the low-pass filter circuit and is used for inverting and integrating the low-frequency polarization voltage signal and outputting an inverted and amplified low-frequency polarization voltage signal.
In some embodiments, the low pass filter circuit comprises a first resistor and a first capacitor, and the first resistor and the first capacitor are connected.
In some of these embodiments, the circuit further comprises:
the first reverse-phase amplifying circuit is connected with the front-end amplifying circuit and used for performing reverse-phase amplification on the induced voltage signal after the polarization voltage is counteracted and outputting the induced voltage signal after the reverse-phase amplification;
the analog-to-digital converter is connected with the first inverting amplifying circuit and used for performing analog-to-digital conversion on the induction voltage signal after inverting amplification and outputting a digital signal;
and the micro control unit is connected with the analog-to-digital converter and is used for processing the digital signal.
In some of these embodiments, the first inverting amplification circuit includes a first inverting amplifier, a second resistor, and a third resistor;
one end of the second resistor, one end of the third resistor, and an inversion of the first inverting amplifier
The input ends of the first resistor are interconnected, the other end of the first resistor is used as the input end of the first inverting amplifier circuit and is connected with the front-end amplifier circuit, the non-inverting input end of the first inverting amplifier is grounded, and the other end of the first resistor is connected with the output end of the first inverting amplifier circuit and is used as the output end of the first inverting amplifier circuit.
In some of these embodiments, the circuit further comprises:
the signal extraction end of the extraction circuit is connected with the front-end amplification circuit and is used for extracting a common-mode noise signal;
and the cancellation driving circuit is connected with the extraction circuit and is used for canceling the received common mode noise signal.
In some embodiments, the extraction circuit includes a gain resistor, an extraction end of the gain resistor is connected to the cancellation driving circuit, and an extraction end of the gain resistor is a signal extraction end of the extraction circuit;
the gain resistor is used for extracting the common mode noise signal and extracting the common mode noise signal
And outputting the output to the cancellation driving circuit.
In some of these embodiments, the de-drive circuit includes a follower, a second inverting amplification circuit, and an output terminal electrode;
the follower is used for collecting a common-mode noise signal and outputting the common-mode noise signal;
the second inverting amplifying circuit is connected with the follower and used for inverting and amplifying the common-mode noise signal and outputting the inverted and amplified common-mode noise signal;
and the output end electrode is connected with the second inverting amplifying circuit and used for outputting the common-mode noise signal after inverting amplification to internal fluid of the electromagnetic water meter or the electromagnetic flowmeter so as to counteract the common-mode noise.
Compared with the prior art, the embodiment of the application provides a converter measuring circuit of an electromagnetic water meter, which comprises an input end electrode, a front end amplifying circuit and an alternating current coupling circuit, wherein the front end amplifying circuit amplifies an induced electromotive force signal received by the input end electrode and outputs an amplified induced voltage signal, the alternating current coupling circuit extracts a low-frequency polarization voltage signal from the amplified induced voltage signal and inputs the low-frequency polarization voltage signal into the front end amplifying circuit after inverse integration to offset polarization voltage so as to filter the low-frequency polarization voltage signal (low-frequency noise signal), so that the integrity and real-time performance of a useful signal are maintained, and the converter measuring circuit of the electromagnetic water meter can adaptively filter the corresponding low-frequency polarization voltage signal and improve the applicability of the circuit, meanwhile, the problem of low system response speed caused by the use of traditional digital filtering or other analog filtering is solved.
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 application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a functional block schematic diagram of a converter measurement circuit of an electromagnetic water meter according to an embodiment of the present application;
figure 2 is a circuit diagram of a converter measurement circuit of an electromagnetic water meter according to an embodiment of the present application;
fig. 3 is a schematic diagram of another functional block of a converter measurement circuit of an electromagnetic water meter according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase 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. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference herein to "a plurality" means greater than or equal to two. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.
Fig. 1 is a schematic functional block diagram of a converter measuring circuit of an electromagnetic water meter according to an embodiment of the present application, and as shown in fig. 1, the converter measuring circuit of the electromagnetic water meter includes:
an input terminal electrode 10 for receiving an induced electromotive force signal; wherein, the number of the input end electrodes 10 is two; for example, input terminal electrode e1 and input terminal electrode e 2;
a front-end amplification circuit 11 connected to the input terminal electrode 10, for amplifying the induced electromotive force signal and outputting the amplified induced voltage signal; the front-end amplifying circuit 11 may be implemented by a front-end amplifying circuit chip, and certainly, in some other embodiments, other front-end amplifying circuits may also be implemented by other front-end amplifying circuits, which is not specifically limited herein;
and the alternating current coupling circuit 12 is connected with the front-end amplification circuit 11, and is used for extracting a low-frequency polarization voltage signal from the amplified induced voltage signal, inverting the phase of the amplified low-frequency polarization voltage signal, and inputting the inverted low-frequency polarization voltage signal into the front-end amplification circuit 11 to cancel the polarization voltage. The ac coupling circuit 12 may be implemented by an ac coupling amplifier chip, and in some other embodiments, a person skilled in the art may replace the ac coupling circuit with a passive filtering and integrating circuit according to practical situations, which is not limited herein.
It can be understood that the ac coupling circuit 12 can filter the induced voltage signal with relatively high frequency, i.e. extract any induced voltage signal with low frequency polarization, and input the low frequency polarization voltage signal into the front-end amplifying circuit 11 after inverse integration to cancel the polarization voltage, i.e. the front-end amplifying circuit 11 and the ac coupling circuit 12 are used in cooperation to filter the low frequency noise signal, so as to keep the useful signal intact
The whole and real-time performance, because the ac coupling amplifying circuit 12 can adaptively filter out the corresponding low-frequency polarization voltage signal, the applicability of the circuit is also improved, and in addition, in order to reduce the whole volume of the circuit, in some other embodiments, the input terminal electrode 10, the front-end amplifying circuit 11 and the ac coupling circuit 12 may be integrally packaged in a chip.
In the technical scheme of this embodiment, the induced electromotive force signal received by the input terminal electrode 10 is amplified by the front-end amplifying circuit 11, and the amplified induced voltage signal is output, the low-frequency polarization voltage signal is extracted from the amplified induced voltage signal by the ac coupling circuit 12, and the low-frequency polarization voltage signal is inverted and integrated and then input to the front-end amplifying circuit 11 to cancel the polarization voltage, so as to filter the low-frequency polarization voltage signal (i.e. the low-frequency noise signal), so as to maintain the integrity and the real-time performance of the useful signal, and because the converter measuring circuit of the electromagnetic water meter can adaptively filter the corresponding low-frequency polarization voltage signal, the applicability of the circuit is also improved, and the problem of slow system response speed caused by using the traditional digital filtering or other analog filtering is solved.
In some alternative embodiments, the front-end amplifying circuit 11 is an operational amplifier U1 or a differential amplifying circuit, but in other embodiments, the front-end amplifying circuit 11 may be replaced by other circuits, which is not limited herein.
Fig. 2 is a circuit diagram of a converter measuring circuit of an electromagnetic water meter according to an embodiment of the present application, and as shown in fig. 2, in an embodiment, an operational amplifier U1 has a reference pin ref for canceling a polarization voltage when the reference pin ref receives a low-frequency polarization voltage signal amplified in reverse phase, and outputting a canceled induced voltage signal.
It can be understood that the induced electromotive force signal received by the input terminal electrode 10 is amplified by the operational amplifier U1 and the amplified induced voltage signal is output, the low-frequency polarization voltage signal is extracted from the amplified induced voltage signal by the ac coupling circuit 12, and the low-frequency polarization voltage signal is inverted and integrated and then input to the reference pin ref of the operational amplifier U1 to cancel the polarization voltage, so as to filter the low-frequency polarization voltage signal (i.e., the low-frequency noise signal), and thus to maintain the integrity and real-time performance of the useful signal.
Referring to fig. 2, in some embodiments, the ac coupling circuit 12 includes:
the low-pass filter circuit 21 is used for filtering out a high-frequency signal in the amplified induced voltage signal and outputting a low-frequency polarization voltage signal; the low-pass filter circuit 21 may be implemented by a low-pass filter chip or the like, and is not limited herein;
and the first inverse integration circuit 22 is connected with the low-pass filter circuit 21, and is configured to invert and integrate the low-frequency polarization voltage signal, and output an inverted and amplified low-frequency polarization voltage signal. The first inverting and integrating circuit 22 is implemented by using an inverting amplifier U3, and the specific type thereof is not limited in detail here.
It should be noted that, since the operational amplifier U1 will amplify both the induced voltage and the polarization signal, and therefore the polarization voltage that has been amplified by the ac coupling circuit 12 is passed through, the high frequency signal in the amplified induced voltage signal is filtered by the low pass filter circuit 21, the low frequency polarization voltage signal is inverted and integrated by the first inverting integrator circuit 22, and the inverted and amplified low frequency polarization voltage signal is output, so as to cancel the polarization voltage, so as to filter the low frequency noise signal, so as to maintain the integrity and real-time performance of the useful signal.
Referring to fig. 2, in an embodiment, the low pass filter circuit 21 includes a first resistor R3 and a first capacitor C1, and the first resistor R3 is connected to the first capacitor C1.
Fig. 3 is a schematic diagram of another functional block of a converter measuring circuit of an electromagnetic water meter according to an embodiment of the present application, and as shown in fig. 3, the front-end amplifying circuit 11 and the ac coupling circuit 12 are used in cooperation to filter a low-frequency noise signal to output a cancelled induced voltage signal, however, since the measured induced voltage signal is often only millivolt to microvolt, in order to improve a common-mode rejection ratio, in some other embodiments, the circuit further includes:
the first inverting amplifier circuit 23 is connected to the front-end amplifier circuit 11, and configured to perform inverting amplification on the induced voltage signal with the polarization voltage cancelled out, and output the inverted and amplified induced voltage signal; the first inverting amplifier circuit 23 may be implemented by an inverting amplifier or the like, and is not limited in particular here;
the analog-to-digital converter 24 is connected with the first inverting amplifier circuit 23, and is configured to perform analog-to-digital conversion on the induced voltage signal after inverting amplification and output a digital signal; the analog-to-digital converter 24, also called ADC, may also be implemented by an analog-to-digital conversion chip in other embodiments, and is not specifically limited herein;
and the micro control unit MCU is connected with the analog-to-digital converter 24 and is used for processing the digital signals. After processing, the flow rate of the circuit can be measured and calculated, and the accuracy of the circuit is improved. It should be noted that the MCU can be implemented by a single chip, a DSP, an FPGA, or a CPU, and in some other embodiments, can also be implemented by a PLC and a CPLD, which are not limited herein;
further, referring to fig. 2 and 3, in an embodiment, the first inverting amplifier circuit 23 includes a first inverting amplifier U2, a second resistor R1, and a third resistor R2;
one end of the second resistor R1, one end of the third resistor R2, and the inverting input terminal of the first inverting amplifier U2 are interconnected, the other end of the second resistor R1 is connected to the front-end amplifier circuit 11 as the input terminal of the first inverting amplifier circuit 23, the non-inverting input terminal of the first inverting amplifier U2 is grounded GND, and the other end of the third resistor R2 and the output terminal of the first inverting amplifier U2 are connected as the output terminal of the first inverting amplifier circuit 23.
In addition, the problem of differential mode noise caused by electrode corrosion is also caused, and the problem is particularly obvious in the measurement of small flow rate, and in the related art, only a digital filtering mode is adopted, but the mode also has obvious limitations, such as system response speed, signal distortion and the like. In order to overcome the common mode to serial mode noise caused by electrode corrosion or signal line mismatch and improve the common mode rejection ratio, referring to fig. 2 and 3, in an embodiment, the circuit further includes:
the signal extraction end of the extraction circuit 25 is connected with the front-end amplification circuit 11 and is used for extracting a common-mode noise signal;
and the cancellation driving circuit 26 is connected to the extraction circuit 25 and is configured to cancel the received common mode noise signal.
In this embodiment, the common mode noise signal extracted by the extraction circuit 25 is cancelled by the cancellation driving circuit, so as to achieve cancellation of the common mode noise, and simultaneously solve the problem of differential mode noise caused by electrode corrosion, and compared with the related art, the method only uses a digital filtering (or other analog filtering) mode to avoid the problems of slow system response speed, signal distortion and the like, and meanwhile, in this embodiment, the common mode noise signal extracted by the extraction circuit 25 is cancelled by the cancellation driving circuit so as to improve the measurement accuracy and reliability of the electromagnetic water meter or the electromagnetic flow meter during the small flow rate measurement.
Specifically, referring to fig. 2, in an embodiment, the extraction circuit 25 includes a gain resistor Rg1, an extraction terminal of the gain resistor Rg1 is connected to the cancellation driving circuit 26, and an extraction terminal of the gain resistor Rg1 is a signal extraction terminal of the extraction circuit 25;
and the gain resistor Rg1 is used for extracting the common mode noise signal and outputting the extracted common mode noise signal to the cancellation driving circuit 26.
In an alternative embodiment, referring to fig. 2, the cancellation driving circuit 26 includes a follower 261, a second inverting amplification circuit 262, and an output terminal electrode ev;
the follower 261 is used for collecting a common mode noise signal and outputting the common mode noise signal; wherein, the follower 261 is implemented by using an operational amplifier U4 or others, and is not specifically limited herein;
a second inverting amplifier circuit 262 connected to the follower 261, for inverting-amplifying the common mode noise signal and outputting the inverted-amplified common mode noise signal; specifically, the second inverting amplifier circuit 262 includes a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C2, and an inverting amplifier U5, but in some other embodiments, the second inverting amplifier circuit 262 may also be implemented by using other inverting amplifier chips, which is not specifically limited herein;
and an output terminal electrode ev connected to the second inverting amplifier circuit 262 for outputting the common mode noise signal after inverting amplification to the internal fluid of the electromagnetic water meter or the electromagnetic flow meter to cancel the common mode noise.
It should be understood by those skilled in the art that various features of the above embodiments can be combined arbitrarily, and for the sake of brevity, all possible combinations of the features in the above embodiments are not described, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A converter measurement circuit of an electromagnetic water meter, comprising:
the input end electrode is used for receiving an induced electromotive force signal;
the front-end amplifying circuit is connected with the input end electrode and is used for amplifying the induced electromotive force signal and outputting an amplified induced voltage signal;
and the alternating current coupling circuit is connected with the front-end amplifying circuit and is used for extracting a low-frequency polarization voltage signal from the amplified induced voltage signal and inputting the low-frequency polarization voltage signal into the front-end amplifying circuit after inverting the phase of the low-frequency polarization voltage signal so as to offset the polarization voltage.
2. The electromagnetic water meter transducer measurement circuit of claim 1 wherein said front end amplifier circuit is an instrumentation amplifier or a differential amplifier circuit.
3. The electromagnetic water meter transducer measurement circuit of claim 2 wherein said instrumentation amplifier has a reference pin for canceling the polarization voltage when said reference pin receives an inverted amplified low frequency polarization voltage signal and outputting a canceled amplified induced voltage signal.
4. The electromagnetic water meter transducer measurement circuit of claim 1 wherein said ac coupling circuit comprises:
the low-pass filter circuit is used for filtering out a high-frequency signal in the amplified induction voltage signal and outputting a low-frequency polarization voltage signal;
and the first inverse integration circuit is connected with the low-pass filter circuit and is used for inverting and integrating the low-frequency polarization voltage signal and outputting an inverted and amplified low-frequency polarization voltage signal.
5. The electromagnetic water meter transducer measurement circuit of claim 4, wherein said low pass filter circuit comprises a first resistor and a first capacitor, said first resistor being connected to said first capacitor.
6. The electromagnetic water meter transducer measurement circuit of claim 1, said circuit further comprising:
the first reverse-phase amplifying circuit is connected with the front-end amplifying circuit and used for performing reverse-phase amplification on the induced voltage signal after the polarization voltage is counteracted and outputting the induced voltage signal after the reverse-phase amplification;
the analog-to-digital converter is connected with the first inverting amplifying circuit and used for performing analog-to-digital conversion on the induction voltage signal after inverting amplification and outputting a digital signal;
and the micro control unit is connected with the analog-to-digital converter and is used for processing the digital signal.
7. The electromagnetic water meter's transducer measurement circuit of claim 6, wherein said first inverting amplifier circuit includes a first inverting amplifier, a second resistor and a third resistor;
one end of the second resistor, one end of the third resistor and the inverting input end of the first inverting amplifier are interconnected, the other end of the second resistor is used as the input end of the first inverting amplifying circuit and is connected with the front-end amplifying circuit, the non-inverting input end of the first inverting amplifier is grounded, and the other end of the third resistor and the output end of the first inverting amplifier are connected and are used as the output end of the first inverting amplifying circuit.
8. The electromagnetic water meter transducer measurement circuit of claim 1, said circuit further comprising:
the signal extraction end of the extraction circuit is connected with the front-end amplification circuit and is used for extracting a common-mode noise signal;
and the cancellation driving circuit is connected with the extraction circuit and is used for canceling the received common mode noise signal.
9. The converter measuring circuit of the electromagnetic water meter according to claim 8, wherein the extraction circuit includes a gain resistor, an extraction end of the gain resistor is connected to the cancellation driving circuit, and an extraction end of the gain resistor is a signal extraction end of the extraction circuit;
the gain resistor is used for extracting the common mode noise signal and extracting the common mode noise signal
And outputting the output to the cancellation driving circuit.
10. The electromagnetic water meter's transducer measurement circuit of claim 8, wherein said de-drive circuit includes a follower, a second inverting amplifier circuit, and an output terminal electrode;
the follower is used for collecting a common-mode noise signal and outputting the common-mode noise signal;
the second inverting amplifying circuit is connected with the follower and used for inverting and amplifying the common-mode noise signal and outputting the inverted and amplified common-mode noise signal;
and the output end electrode is connected with the second inverting amplifying circuit and used for outputting the common-mode noise signal after inverting amplification to internal fluid of the electromagnetic water meter or the electromagnetic flowmeter so as to counteract the common-mode noise.
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| CN202110523803.5A CN113253027A (en) | 2021-05-13 | 2021-05-13 | Converter measuring circuit of electromagnetic water meter |
| PCT/CN2021/120135 WO2022237043A1 (en) | 2021-05-13 | 2021-09-24 | Converter measurement circuit of electromagnetic water meter |
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| CN202110523803.5A CN113253027A (en) | 2021-05-13 | 2021-05-13 | Converter measuring circuit of electromagnetic water meter |
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| WO2022237043A1 (en) * | 2021-05-13 | 2022-11-17 | 宁波水表(集团)股份有限公司 | Converter measurement circuit of electromagnetic water meter |
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| CN116840578B (en) * | 2023-09-01 | 2023-11-21 | 中国海洋大学 | Fluid noise interference cancellation method and device for dynamic measurement of underwater electric field |
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| CN103505202A (en) * | 2012-06-27 | 2014-01-15 | 天津宇迪智能技术有限公司 | Heart and brain coupled system for synchronously collecting ECG signals and EEG signals |
| CN103705230A (en) * | 2014-01-14 | 2014-04-09 | 南京大学 | Pre-stage circuit in bioelectricity detection |
| US20160003880A1 (en) * | 2014-07-07 | 2016-01-07 | Em Microelectronic-Marin Sa | Method for measuring a physical parameter and electronic circuit for implementing the same |
| CN108649342A (en) * | 2018-04-04 | 2018-10-12 | 西安富士达微波技术有限公司 | A kind of probe unit for realizing dual polarized signals transmission using Medium Wave Guide |
| CN209310859U (en) * | 2018-11-30 | 2019-08-27 | 深圳市大疆创新科技有限公司 | Moveable platform, electromagnetic flowmeter and its electrode signal amplifier |
| CN109974799A (en) * | 2019-04-19 | 2019-07-05 | 合肥工业大学 | A kind of self-adaptive electromagnetic flowmeter polarization noise bucking-out system based on feedforward control |
| CN211978012U (en) * | 2020-03-31 | 2020-11-20 | 开封威利流量仪表有限公司 | Converter circuit of low-conductivity electromagnetic flowmeter |
| CN211978013U (en) * | 2020-04-29 | 2020-11-20 | 上海肯特仪表股份有限公司 | Electromagnetic water meter circuit with high efficiency and small interference |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022237043A1 (en) * | 2021-05-13 | 2022-11-17 | 宁波水表(集团)股份有限公司 | Converter measurement circuit of electromagnetic water meter |
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| Publication number | Publication date |
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| WO2022237043A1 (en) | 2022-11-17 |
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