CN203811213U - Signal regulating circuit for electromagnetic flowmeter - Google Patents
Signal regulating circuit for electromagnetic flowmeter Download PDFInfo
- Publication number
- CN203811213U CN203811213U CN201420029843.XU CN201420029843U CN203811213U CN 203811213 U CN203811213 U CN 203811213U CN 201420029843 U CN201420029843 U CN 201420029843U CN 203811213 U CN203811213 U CN 203811213U
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- electromagnetic flowmeter
- signal
- rom
- frequency divider
- electromagnetic
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Abstract
The utility model provides a signal regulating circuit for an electromagnetic flowmeter. The development and application history of the electromagnetic flowmeter is the development history of an anti-interference technology of the electromagnetic flowmeter. Particularly for the processing of micro flow rate measuring signals, the noise interference is greater, and the flow rate signals are very weak, so the modulation circuit cannot perfectly eliminate the influence of higher harmonics and additive noise on the signals. The signal regulating circuit consists of an electromagnetic sensor (1), wherein the electromagnetic sensor is connected with a high-performance operation amplifier (2) and a phase-locked loop (6) through electrode output signals, the high-performance operation amplifier is connected with a multiplicative D/A (digital to analog converter) (3), the phase-locked loop is connected with a frequency divider (7), the frequency divider is connected with an ROM (read only memory) (8), the ROM is connected with the multiplicative D/A, and the multiplicative D/A is connected with a low-pass filter. The utility model relates to the signal regulating circuit for the electromagnetic flowmeter based on a digital and analog mixed correlation measurement method.
Description
technical field:
the utility model relates to a kind of electromagnetic flowmeter signal modulate circuit based on digital-to-analogue composite dependency mensuration, namely relates to a kind of signal condition technology of the electromagnetic flowmeter that is applied to faint flow detection.
background technology:
the history of electromagnetic flowmeter development and application is exactly the developing history of its Anti-Jamming Technique, particularly in the processing of micro-flow measurement signal, because its noise is larger, and flow signal is very small and weak, in known electromagnetic flowmeter, the conditioning of flow signal is generally adopted to peak sampling hold circuit, this modulate circuit is Eliminate highter harmonic and the impact of additive noise on signal well, the problem that causes signal to noise ratio (S/N ratio) measurement lower limit low, that differentiate rate variance, flow to be difficult to be expanded.
utility model content:
the utility model object is to provide a kind of signal adjustment circuit of electromagnetic flowmeter.
the purpose of this utility model is achieved in that
a kind of signal adjustment circuit of electromagnetic flowmeter, its composition comprises: electromagnetic sensor, described electromagnetic sensor is connected to high performance operational amplifier and phaselocked loop by electrode handle output signal, described high performance operational amplifier is connected with multiplication type D/A, described phaselocked loop is connected with frequency divider, described frequency divider is connected with ROM storer, and described ROM storer is connected with described multiplication type D/A, and described multiplication type D/A is connected with low-pass filter.
the signal adjustment circuit of described electromagnetic flowmeter, the interelectrode voltage jointer of described electromagnetic sensor is connected to the reference voltage input terminal of described multiplication type D/A through described operational amplifier, interelectrode described electromagnetic sensor voltage terminal is connected to the input end of described phaselocked loop simultaneously.
the signal adjustment circuit of described electromagnetic flowmeter, the output terminal of described phaselocked loop is connected to the clock end of described frequency divider, and described frequency divider output terminal is connected to the address input end of ROM, and the FPDP of ROM is received the data-in port of D/A.
the signal adjustment circuit of described electromagnetic flowmeter, the output terminal of described D/A converter connects low-pass filter.
beneficial effect:
1. the utility model adopts the algorithm that signal is carried out to optimal filtering based on digital-to-analogue composite dependency mensuration; added to the reference voltage end of multiplication type d/a converter through signal amplifier by conditioned signal; with be stored in ROM in D/A converter, realize multiplication with the digital signal of frequently synchronizeing, and realize integration and be averaging computing and obtain the output signal of optimum signal to noise ratio (S/N ratio) by low-pass filter.Sort circuit has the ground coupling opsonic action of signal to noise ratio (S/N ratio) optimum to signal, can effectively suppress noise, improves resolution, the measurement lower limit of expansion electromagnetic flowmeter.
the method that the utility model has adopted digital-to-analogue to mix Optimum Matching filtering, can realize the maximum signal to noise ratio output to measurement voltage signal, realizes the Measurement accuracy of faint flow signal, improves the performance index of electromagnetic flowmeter.
the utility model adopts the signal synchronization circuit of phase-locked loop circuit and counter composition, and the same frequency of having realized digital and analogue signals is synchronous.
the utility model adopts low-pass filter to replace integration to be averaging the realization of having simplified circuit.
the utility model can be isolated the conditioning output signal of optimum signal-noise ratio in noise circumstance, improves resolution, the lower limit of expansion flow measurement.
brief description of the drawings:
accompanying drawing 1 is that digital-to-analogue of the present utility model is mixed optimal filtering method signal conditioning circuit structural drawing.
accompanying drawing 2 is amplifier circuits.
accompanying drawing 3 is signal synchronization circuits of phaselocked loop and frequency divider composition.
accompanying drawing 4 is digital signal circuit for generatings.
accompanying drawing 5 is analog digital multiplier circuits.
accompanying drawing 6 is low-pass filter circuits.
embodiment:
embodiment 1:
a kind of signal adjustment circuit of electromagnetic flowmeter, electromagnetic sensor electrode output signal u(t) 1, described electromagnetic sensor electrode output signal u(t) connection high performance operational amplifier 2 and phaselocked loop 6, described high performance operational amplifier is connected with multiplication type D/A3, described phaselocked loop is connected with frequency divider 7, described frequency divider is connected with ROM storer 8, and described ROM storer is connected with described multiplication type D/A, and described multiplication type D/A is connected 4 with low-pass filter.The utility model relates to a kind of electromagnetic flowmeter signal modulate circuit based on digital-to-analogue composite dependency mensuration.
embodiment 2:
according to the signal adjustment circuit of the electromagnetic flowmeter described in embodiment 1, the interelectrode voltage u of described electromagnetic sensor (t) is added to the reference voltage input terminal of described multiplication type D/A through described operational amplifier, interelectrode described electromagnetic sensor voltage u (t) is added to the input end of described phaselocked loop, described electromagnetic sensor electrode output signal u(t simultaneously) realize digital and analogue signals with frequently synchronous by described phaselocked loop.
embodiment 3:
according to the signal adjustment circuit of the electromagnetic flowmeter described in embodiment 1 or 2, the output terminal of described phaselocked loop is added to the clock end of described frequency divider as clock control signal, the output of described frequency divider is as having with u (t) with homotype digital signal u ' ROM address input (t) frequently, the FPDP of ROM is received the data-in port of D/A, has so just realized input signal u (t) and u ' (t) with frequency synchronous multiplication.
embodiment 4:
according to the signal adjustment circuit of the electromagnetic flowmeter described in embodiment 1 or 2 or 3; the output signal of described D/A converter is through low-pass filter; utilize second order filter that corner frequency is low to be equal to integrator and realize integration and be averaging and obtain direct-flow output signal u0 5, completed the digital-to-analogue of signal between electromagnetic sensor electrode is mixed to optimal filtering conditioning.
embodiment 5:
the utility model adopts low frequency square wave current excitation, first the digital quantity in the square-wave signal one-period of corresponding low frequency excitation electric current is stored in ROM, then the sensor electrode square-wave output signal u (t) being directly proportional to uninterrupted is amplified to 0-5v and is added to the reference voltage end of multiplication type d/a converter through high performance operational amplifier; Simultaneously; then u (t) is added to the input end of phaselocked loop; its output is as the clock input of frequency multiplier circuit; address signal using the output of frequency multiplier circuit as ROM is also connected to the data output of ROM on D/A converter numeral input port; realize digital-to-analogue and mix multiplication; the low-pass filter that is finally 0.5Hz by the imitated output quantity of D/A converter through cutoff frequency utilizes this low-pass filter to complete integration and is averaging computing, so just obtains being proportional to the maximum signal to noise ratio direct current output quantity of flow.
Claims (3)
1. the signal adjustment circuit of an electromagnetic flowmeter, its composition comprises: electromagnetic sensor, it is characterized in that: described electromagnetic sensor is connected to high performance operational amplifier and phaselocked loop by electrode handle output signal, described high performance operational amplifier is connected with multiplication type D/A, described phaselocked loop is connected with frequency divider, described frequency divider is connected with ROM storer, and described ROM storer is connected with described multiplication type D/A, and described multiplication type D/A is connected with low-pass filter.
2. the signal adjustment circuit of electromagnetic flowmeter according to claim 1, it is characterized in that: the interelectrode voltage jointer of described electromagnetic sensor is connected to the reference voltage input terminal of described multiplication type D/A through described operational amplifier, interelectrode described electromagnetic sensor voltage terminal is connected to the input end of described phaselocked loop simultaneously.
3. the signal adjustment circuit of electromagnetic flowmeter according to claim 1 and 2, it is characterized in that: the output terminal of described phaselocked loop is connected to the clock end of described frequency divider, described frequency divider output terminal is connected to the address input end of ROM, and the FPDP of described ROM is received the data-in port of described multiplication type D/A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420029843.XU CN203811213U (en) | 2014-01-17 | 2014-01-17 | Signal regulating circuit for electromagnetic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420029843.XU CN203811213U (en) | 2014-01-17 | 2014-01-17 | Signal regulating circuit for electromagnetic flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203811213U true CN203811213U (en) | 2014-09-03 |
Family
ID=51449951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420029843.XU Expired - Fee Related CN203811213U (en) | 2014-01-17 | 2014-01-17 | Signal regulating circuit for electromagnetic flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203811213U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106556439A (en) * | 2015-09-24 | 2017-04-05 | 微动公司 | Entrained fluid checkout and diagnosis |
-
2014
- 2014-01-17 CN CN201420029843.XU patent/CN203811213U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106556439A (en) * | 2015-09-24 | 2017-04-05 | 微动公司 | Entrained fluid checkout and diagnosis |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140903 Termination date: 20150117 |
|
| EXPY | Termination of patent right or utility model |