CN204556037U - The adjustable excited circuit of a kind of electromagnetic flowmeter high precision - Google Patents
The adjustable excited circuit of a kind of electromagnetic flowmeter high precision Download PDFInfo
- Publication number
- CN204556037U CN204556037U CN201520190669.1U CN201520190669U CN204556037U CN 204556037 U CN204556037 U CN 204556037U CN 201520190669 U CN201520190669 U CN 201520190669U CN 204556037 U CN204556037 U CN 204556037U
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- China
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- circuit
- triode
- electronic switch
- output voltage
- electromagnetic flowmeter
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Abstract
The utility model discloses the adjustable excited circuit of a kind of electromagnetic flowmeter high precision.The utility model is by CPU control D/A change-over circuit output voltage, and control constant-current drive circuit and produce exciting current, drive coil produces magnetic field.Field circuit consists of, D/A changes output voltage values Vin, connect the in-phase end of operational amplifier U1, the end of oppisite phase connecting resistance R1 of U1 and the emitter of triode Q1, another termination power Vcc of R1, triode Q1 base stage connecting resistance R2, the output terminal of another termination operational amplifier of R2 U1, the collector of triode Q1 meets electronic switch S1 and S2 Chang Kaiduan, the common port wiring circle two ends respectively of the normally closed termination GND of electronic switch S1 and S2, electronic switch S1 and S2.Electromagnetic flowmeter field circuit of the present utility model can realize accurate adjustment to exciting current, to adapt to multiple caliber body, avoids the signal difference problems of too because different bore body causes, and make electromagnetic flowmeter survey more accurate, versatility is stronger.
Description
Technical field
The utility model relates to field of flow measurement, particularly relates to the adjustable excited circuit of a kind of electromagnetic flowmeter high precision.
Background technology
Electromagnetic flowmeter is a kind of pinpoint accuracy Ferraris instrument being used for conducting medium volumetric flow rate in measuring tube according to Faraday's electromagnetic induction law manufacture, its principle is by field circuit drive coil, produce a magnetic field, when media flow, meeting induction electromotive force in potential electrode, value and the flow of measuring electromotive force are linear.From its principle, the degree of accuracy impact of field circuit on electromagnetic flowmeter is very large, a usual field circuit needs the body adapting to multiple caliber, but the magnetic field intensity that the body of different bore produces under same exciting current is different, the signal intensity that electrode measures is different, difficulty is caused to the process of subsequent conditioning circuit, particularly to A/D conversion circuit part, if the range arranging A/D converter is excessive, conversion accuracy can be caused to be deteriorated, if it is too small to arrange range, the signal when magnetic field intensity is large can be caused to exceed measurement range.How to select suitable exciting current to be the major issue of electromagnetic flowmeter always.
Utility model content
The utility model cannot adapt to the problem of multiple caliber body in order to solve single exciting current, provide the adjustable excited circuit of a kind of electromagnetic flowmeter high precision.It is adjustable that this circuit can realize exciting current, to adapt to multiple caliber body.
The technical scheme adopted for realizing the purpose of this utility model is:
The adjustable excited circuit of a kind of electromagnetic flowmeter high precision, by the output voltage of CPU controls D/A change-over circuit, described output voltage as constant current field circuit power supply and control constant current field circuit and produce exciting current, exciting current drive coil generation magnetic field.
Field circuit consists of, D/A change-over circuit output voltage values Vin, the in-phase end of output voltage termination operational amplifier U1, the end of oppisite phase connecting resistance R1 of U1 and the emitter of triode Q1, another termination power Vcc of R1, triode Q1 base stage connecting resistance R2, the output terminal of another termination operational amplifier of R2 U1, the collector of triode Q1 meets electronic switch S1 and S2 Chang Kaiduan, the common port wiring circle two ends respectively of the normally closed termination GND of electronic switch S1 and S2, electronic switch S1 and S2.
The utility model is connect by CPU control S1 and often opens, S2 connects normally closed, just can realize the excitation of forward current, CPU control S2 connects and often opens, and S1 connects normally closed, just can realize the excitation of inverse current, if CPU control S1 connects normally closed, S2 connects normally closed, then excitation-free current, thus CPU timing controlled electronic switch is closed, just can realize diadic square wave excitation or the three value square wave excitations of electromagnetic flowmeter easily.The exciting current of field circuit is
, so the output voltage Vin of CPU control break D/A change-over circuit, just can control exciting current, realize the accurately adjustable of exciting current.
Compared with prior art, the beneficial effects of the utility model are:
Electromagnetic flowmeter field circuit of the present utility model can realize accurate adjustment to exciting current, to adapt to multiple caliber body, avoids the signal difference problems of too because different bore body causes, and make electromagnetic flowmeter survey more accurate, versatility is stronger.
Accompanying drawing explanation
Figure 1 shows that field circuit theory diagram of the present utility model.
Figure 2 shows that field circuit schematic diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, by CPU control D/A change-over circuit output voltage, control constant-current drive circuit and produce exciting current, drive coil produces magnetic field to field circuit theory diagram of the present utility model.
Field circuit schematic diagram of the present utility model as shown in Figure 2, D/A changes output voltage values Vin, connect the in-phase end of operational amplifier U1, the end of oppisite phase connecting resistance R1 of U1 and the emitter of triode Q1, another termination power Vcc of R1, triode Q1 base stage connecting resistance R2, the output terminal of another termination operational amplifier of R2 U1, the collector of triode Q1 meets electronic switch S1 and S2 Chang Kaiduan, the common port wiring circle two ends respectively of the normally closed termination GND of electronic switch S1 and S2, electronic switch S1 and S2.
CPU control S1 connects and often opens, S2 connects normally closed, just can realize the excitation of forward current, CPU control S2 connects and often opens, and S1 connects normally closed, just can realize the excitation of inverse current, if CPU control S1 connects normally closed, S2 connects normally closed, then excitation-free current, thus CPU timing controlled electronic switch is closed, just can realize diadic square wave excitation or the three value square wave excitations of electromagnetic flowmeter easily.The exciting current of field circuit is
, so the output voltage Vin of CPU control break D/A change-over circuit, just can control exciting current, realize the accurately adjustable of exciting current.
Electromagnetic flowmeter field circuit of the present utility model can realize accurate adjustment to exciting current, to adapt to multiple caliber body, avoids the signal difference problems of too because different bore body causes, and be that electromagnetic flowmeter survey is more accurate, versatility is stronger.
The above is only preferred implementation of the present utility model; it should be noted that; for those skilled in the art; under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (1)
1. the adjustable excited circuit of electromagnetic flowmeter high precision, it is characterized in that, by the output voltage of CPU control D/A change-over circuit, described output voltage as constant current field circuit power supply and control constant current field circuit produce exciting current, exciting current drive coil produce magnetic field; Described field circuit consists of: D/A change-over circuit output voltage values Vin, the in-phase end of output voltage termination operational amplifier U1, the end of oppisite phase connecting resistance R1 of U1 and the emitter of triode Q1, another termination power Vcc of R1, triode Q1 base stage connecting resistance R2, the output terminal of another termination operational amplifier of R2 U1, the collector of triode Q1 meets electronic switch S1 and S2 Chang Kaiduan, the common port wiring circle two ends respectively of the normally closed termination GND of electronic switch S1 and S2, electronic switch S1 and S2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520190669.1U CN204556037U (en) | 2015-04-01 | 2015-04-01 | The adjustable excited circuit of a kind of electromagnetic flowmeter high precision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520190669.1U CN204556037U (en) | 2015-04-01 | 2015-04-01 | The adjustable excited circuit of a kind of electromagnetic flowmeter high precision |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204556037U true CN204556037U (en) | 2015-08-12 |
Family
ID=53831134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520190669.1U Expired - Fee Related CN204556037U (en) | 2015-04-01 | 2015-04-01 | The adjustable excited circuit of a kind of electromagnetic flowmeter high precision |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204556037U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109524194A (en) * | 2018-12-04 | 2019-03-26 | 株洲悍威磁电科技有限公司 | A kind of battery-type electricity permanent magnet and its forward and reverse exciting method |
| US10712184B1 (en) | 2019-01-09 | 2020-07-14 | Georg Fischer Signet Llc | Magnetic flowmeter assembly having independent coil drive and control system |
| US11365995B2 (en) | 2018-09-28 | 2022-06-21 | Georg Fischer Signet Llc | Magnetic flowmeter including auxiliary electrodes upstream and downstream of the pair of measuring electrodes and an adjustable brace |
-
2015
- 2015-04-01 CN CN201520190669.1U patent/CN204556037U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11365995B2 (en) | 2018-09-28 | 2022-06-21 | Georg Fischer Signet Llc | Magnetic flowmeter including auxiliary electrodes upstream and downstream of the pair of measuring electrodes and an adjustable brace |
| CN109524194A (en) * | 2018-12-04 | 2019-03-26 | 株洲悍威磁电科技有限公司 | A kind of battery-type electricity permanent magnet and its forward and reverse exciting method |
| US10712184B1 (en) | 2019-01-09 | 2020-07-14 | Georg Fischer Signet Llc | Magnetic flowmeter assembly having independent coil drive and control system |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150812 Termination date: 20160401 |