CN110836988A - Manganese-copper current divider capable of resisting work magnetic interference and application thereof - Google Patents
Manganese-copper current divider capable of resisting work magnetic interference and application thereof Download PDFInfo
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- CN110836988A CN110836988A CN201911169847.1A CN201911169847A CN110836988A CN 110836988 A CN110836988 A CN 110836988A CN 201911169847 A CN201911169847 A CN 201911169847A CN 110836988 A CN110836988 A CN 110836988A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The manganese-copper shunt comprises a first conducting strip, a second conducting strip and a manganese-copper sheet, wherein the first conducting strip, the manganese-copper sheet and the second conducting strip are sequentially connected and positioned on the same plane; a first sampling connecting end is arranged at the upward protruding part of the upper side edge of the first conductive sheet, and a second sampling connecting end is arranged at the upward protruding part of the upper side edge of the second conductive sheet; the first sampling connecting end and the second sampling connecting end are connected with an ammeter circuit board through twisted-pair lines; and an anti-work magnetic interference circuit is also arranged between the twisted pair and the electric meter circuit board. The manganese-copper shunt with the anti-work magnetic interference function and the application thereof have simple structure, and the manganese-copper shunt serving as a current sampling element is greatly reduced by the anti-work magnetic interference circuit from the interference of an alternating magnetic field, so that the influence of the magnetic field on a current sampling signal is reduced, and the metering accuracy of the electronic electric energy meter is effectively ensured. The application is wide.
Description
Technical Field
The invention belongs to the technical field of shunts, and particularly relates to a manganese-copper shunt capable of resisting work magnetic interference and application thereof.
Background
The electronic electric energy meter is a physical instrument which samples the voltage and current supplied by a user in real time, processes and multiplies the sampled voltage and current signals by a special electric energy meter integrated circuit to convert the sampled voltage and current signals into pulses which are in direct proportion to electric energy to be output, and displays the pulses by a meter or a digital display.
The current sampling unit of the electronic electric energy meter comprises a current transformer sampling mode and a manganin shunt sampling mode, the measurement of the current of a live wire is usually realized by adopting a manganin shunt element, and the measurement of the current of a neutral wire adopts a current transformer element.
The manganin shunt is widely applied to current measurement due to the advantages of small temperature coefficient and low cost. As a key component of a current sampling circuit of the single-phase electric energy meter, the accuracy of the current sampling of the manganin shunt can directly influence the metering precision of the electric energy meter. The electromagnetic knowledge and the transformer characteristics can know that the power frequency magnetic field hardly influences the current transformer and can cause great influence on the manganin shunt.
When a manganin shunt in a current sampling part of a traditional electronic electric energy meter is subjected to electromagnetic interference, metering errors can be generated, and influences are caused to users and power grid companies. In order to overcome the defects of the traditional electronic electric energy meter magnetic field interference resisting technology, the structure of the traditional manganin shunt needs to be improved, so that the manganin shunt can resist the magnetic field interference from an uncertain direction, and the metering accuracy of the electronic electric energy meter is ensured.
Chinese patent application No. CN201721612107.7 discloses a manganese-copper shunt of anti power frequency magnetic field, the inboard of manganese-copper shunt body is provided with the manganese-copper body, and the inboard both ends of manganese-copper body all are provided with the connection pin, are connected with the sample lead wire on the connection pin, and the inboard of sample lead wire is provided with antimagnetic layer, and one side of sample lead wire is provided with connecting wire, and antimagnetic cover has been cup jointed in the outside of manganese-copper shunt body. The device resists a power frequency magnetic field through the antimagnetic sleeve and the antimagnetic layer, the effect of the antimagnetic field is weak, and the service lives of the antimagnetic sleeve and the antimagnetic layer are short.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide the manganese-copper current divider capable of resisting the electromagnetic interference and the application thereof, the structure is simple, the function of resisting the electromagnetic interference is achieved through the circuit for resisting the electromagnetic interference, interference signals are restrained through the filtering and differential amplifying circuit, the physical isolation of the input part and the output part is realized through the isolation amplifying circuit, the interference of an alternating magnetic field on the manganese-copper current divider serving as a current sampling element is greatly reduced, the influence of the magnetic field on the current sampling signal is reduced, and therefore the metering accuracy of the electronic electric energy meter is effectively guaranteed, and the application is wide.
The purpose of the invention is realized by the following technical scheme:
the manganese-copper shunt capable of resisting work magnetic interference is characterized by comprising a first conducting strip, a second conducting strip and a manganese-copper sheet, wherein the first conducting strip, the manganese-copper sheet and the second conducting strip are sequentially connected and are positioned on the same plane; a first sampling connecting end is arranged at the upward protruding part of the upper side edge of the first conductive sheet, and a second sampling connecting end is arranged at the upward protruding part of the upper side edge of the second conductive sheet; the first sampling connecting end and the second sampling connecting end are connected with an ammeter circuit board through twisted-pair lines; an anti-electromagnetic interference circuit is also arranged between the twisted pair and the electric meter circuit board; the anti-electromagnetic interference circuit comprises a filtering and differential amplifying circuit and an isolating amplifying circuit, wherein the filtering and differential amplifying circuit and the isolating amplifying circuit are connected in series.
The manganin shunt is used as a key device in a current sampling circuit of the electric energy meter, and when the electric energy meter is interfered by a power frequency magnetic field, if an induced current generated by the manganin shunt is added to a sampling current, the manganin shunt can obviously influence the metering of the electric energy meter. Considering the internal high integration and the working environment of the electric energy meter, the sources of the electric energy meter which is interfered by the power frequency magnetic field mainly include the leakage flux of a transformer in the meter, the leakage flux of the transformer in a nearby meter, the large current of the inlet wire of a meter box, unreasonable field wiring and the like. According to the manganese-copper shunt resistant to the electromagnetic interference, the manganese-copper sheet is used as a sampling resistance sheet and connected between the first conducting sheet and the second conducting sheet, the conducting sheet connected to one side of the relay is called the first conducting sheet, the conducting sheet connected to the port of the current line is called the second conducting sheet, the zero line current can be converted into a corresponding voltage signal after passing through the manganese-copper shunt, the sampled voltage signal enters a metering chip of a circuit board of an electric meter after passing through an electromagnetic interference resistant circuit from a twisted pair, and the current of the zero line is calculated through conversion, so that the metering of the current is realized. The anti-electromagnetic interference circuit inhibits interference signals through the filtering and differential amplifying circuit, and realizes physical isolation of the input part and the output part through the isolation amplifying circuit, so that the interference of an alternating magnetic field on a manganin shunt serving as a current sampling element is greatly reduced, the influence of the magnetic field on the current sampling signals is reduced, and the metering accuracy of the electronic electric energy meter is effectively ensured.
Furthermore, the first conducting strip and the second conducting strip of the manganese-copper shunt for resisting the electromagnetic interference are pure copper sheets.
Further, the manganese-copper shunt capable of resisting the electromagnetic interference comprises the following components in parts by weight: 50 parts of manganese, 35 parts of copper, 10 parts of zinc, 0.8 part of lead, 0.7 part of boron, 0.5 part of iron, 0.2 part of beryllium and 0.1 part of bismuth.
Furthermore, in the manganese-copper current divider capable of resisting electromagnetic interference, the filtering and differential amplifying circuit comprises a low-pass filtering circuit and a differential amplifying circuit, and the low-pass filtering circuit and the differential amplifying circuit are connected in series.
Furthermore, the low-pass filter circuit of the manganese-copper current divider capable of resisting the electromagnetic interference is formed by connecting two RC low-pass filter circuits in parallel.
Furthermore, in the manganese-copper shunt for resisting the electromagnetic interference, the RC low-pass filter circuit consists of two capacitors and a resistor.
An RC low-pass filter circuit consisting of two capacitors and a resistor performs low-pass filtering processing on the working magnetic interference signals of the circuit.
Further, in the above manganese-copper shunt for resisting electromagnetic interference, the differential amplification circuit is composed of three division amplifiers, and a plurality of capacitors are arranged between input signals of the division amplifiers.
3 differential amplifiers are used in the anti-power magnetic interference circuit to form a 2-stage differential amplification circuit, so that the input impedance and the common-mode rejection ratio of the circuit are improved, and power magnetic interference signals are effectively suppressed.
Furthermore, the differential amplification circuit of the manganese-copper shunt for resisting work magnetic interference further comprises a plurality of power input circuits, and an RC filter circuit is arranged at a power input pin of each power input circuit.
The RC filter circuit is added to the power input pin of each operational amplifier, so that introduced high-frequency interference can be effectively inhibited, the ripple amplitude of the power supply voltage can be reduced, and the stability of the operational performance of the operational amplifier is ensured.
Further, in the manganese-copper shunt with the anti-electromagnetic interference function, the isolation amplifying circuit performs isolation transmission through a linear optical coupler.
The isolation amplifying circuit adopts a linear optocoupler to carry out isolation transmission, can couple analog and digital signals and has high gain stability.
Furthermore, the application of the manganese-copper current divider resisting the electromagnetic interference is a current sampling device of an electronic electric energy meter.
The electronic electric energy meter can be an electronic single-phase electric energy meter, an electronic three-phase active electric energy meter, an electronic active and passive bidirectional multifunctional electric energy meter and the like.
Compared with the prior art, the invention has the following beneficial effects:
the manganese-copper shunt with the anti-work magnetic interference function disclosed by the invention plays a role in resisting the work magnetic interference through the anti-work magnetic interference circuit, wherein interference signals are inhibited and processed through the filtering and differential amplifying circuit, the physical isolation of the input part and the output part is realized through the isolation amplifying circuit, the interference of an alternating magnetic field on the manganese-copper shunt used as a current sampling element is greatly reduced, the influence of the magnetic field on the current sampling signal is reduced, and the metering accuracy of an electronic electric energy meter is effectively ensured; the manganese-copper current divider resistant to the electromagnetic interference is wide in application and can be applied to various electronic electric energy meters such as an electronic single-phase electric energy meter, an electronic three-phase active electric energy meter, an electronic active and passive bidirectional multifunctional electric energy meter and the like.
Drawings
FIG. 1 is a schematic structural diagram of a manganese-copper shunt resistant to electromagnetic interference according to the present invention;
FIG. 2 is a schematic diagram of the electrical connection of the manganese-copper shunt according to the present invention;
FIG. 3 is a schematic circuit diagram of a filter and differential amplifier circuit of the manganese-copper current divider for resisting electromagnetic interference according to the present invention;
in the figure: the device comprises a first conducting strip 1, a first sampling connecting end 11, a second conducting strip 2, a second sampling connecting end 21, a manganin strip 3, a twisted pair 4, an electric meter circuit board 5, an anti-magnetic interference circuit 6, a filtering and differential amplifying circuit 61, a low-pass filtering circuit 611, an RC low-pass filtering circuit 6111, a differential amplifying circuit 612, a power input circuit 613, an RC filtering circuit 6131, an isolation amplifying circuit 62, an a relay and a b current line port.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific experimental data and accompanying drawings 1 to 3, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, the following embodiments provide a manganese-copper current divider resistant to electromagnetic interference, including a first conductive sheet 1, a second conductive sheet 2, and a manganese-copper sheet 3, where the first conductive sheet 1, the manganese-copper sheet 3, and the second conductive sheet 2 are connected in sequence and located on the same plane; a first sampling connecting end 11 is arranged at the upward protruding part of the upper side edge of the first conducting plate 1, and a second sampling connecting end 21 is arranged at the upward protruding part of the upper side edge of the second conducting plate 2; the first sampling connecting end 11 and the second sampling connecting end 21 are connected with an ammeter circuit board 5 through a twisted pair 4; an anti-electromagnetic interference circuit 6 is also arranged between the twisted pair 4 and the electric meter circuit board 5; the anti-electromagnetic interference circuit 6 comprises a filtering and differential amplifying circuit 61 and an isolating amplifying circuit 62, wherein the filtering and differential amplifying circuit 61 and the isolating amplifying circuit 62 are connected in series.
Further, the first conducting strip 1 and the second conducting strip 2 are pure copper sheets. The manganese copper sheet 3 comprises the following components in parts by weight: 50 parts of manganese, 35 parts of copper, 10 parts of zinc, 0.8 part of lead, 0.7 part of boron, 0.5 part of iron, 0.2 part of beryllium and 0.1 part of bismuth.
As shown in fig. 3, the filtering and differential amplifying circuit 61 includes a low-pass filter circuit 611 and a differential amplifying circuit 612, and the low-pass filter circuit 611 and the differential amplifying circuit 612 are connected in series.
Further, the low-pass filter circuit 611 is formed by connecting two RC low-pass filter circuits 6111 in parallel. The RC low-pass filter circuit 6111 is composed of two capacitors and one resistor.
Further, the differential amplification circuit 612 is composed of three dividing and detecting amplifiers 6121, and a plurality of capacitors are disposed between input signals of the dividing and detecting amplifiers 6121.
Further, the differential amplifier circuit 612 further includes a plurality of power input circuits 613, and a power input pin of each power input circuit 613 is provided with an RC filter circuit 6131.
In addition, the isolation amplifying circuit 62 performs isolation transmission through a linear optical coupler.
Examples
The manganese-copper current divider capable of resisting the electromagnetic interference is arranged in a shell of an electronic electric energy meter. Considering the high integration inside the electric energy meter and the working environment, generally, the electric energy meter is considered to be interfered by the power frequency magnetic field mainly due to leakage of the transformer inside the meter, leakage of the transformer inside the adjacent meter, large current of the incoming line of the meter box, unreasonable field wiring and the like. Due to the connection of the electronic electric energy meter with the cable, alternating power frequency electromagnetic field interference can be generated around the cable and the current divider.
According to the manganese-copper shunt resistant to the electromagnetic interference, the manganese-copper sheet 3 is used as a sampling resistance sheet and connected between the first conducting sheet 1 and the second conducting sheet 2, the conducting sheet connected to one side of the relay a is called the first conducting sheet 1, the conducting sheet connected to the current line port b is called the second conducting sheet 2, the zero line current can be converted into a corresponding voltage signal after passing through the manganese-copper shunt, the sampled voltage signal passes through the double-twisted pair 4, the working magnetic interference resistant circuit 6 and then enters the metering chip of the ammeter circuit board 5, the current of the zero line is calculated through conversion, and the metering of the current is realized.
The anti-electromagnetic interference circuit 6 suppresses the interference signal through the filtering and differential amplifying circuit 61, and realizes physical isolation of the input part and the output part through the isolation amplifying circuit 62.
In conclusion, the interference of the power frequency electromagnetic field of the manganin shunt is eliminated through the method.
The invention has many applications, and the above description is only a preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.
Claims (10)
1. The manganese-copper shunt capable of resisting work magnetic interference is characterized by comprising a first conducting strip (1), a second conducting strip (2) and a manganese-copper sheet (3), wherein the first conducting strip (1), the manganese-copper sheet (3) and the second conducting strip (2) are sequentially connected and positioned on the same plane; a first sampling connecting end (11) is arranged at the upward protruding part of the upper side edge of the first conducting strip (1), and a second sampling connecting end (21) is arranged at the upward protruding part of the upper side edge of the second conducting strip (2); the sampling connecting end I (11) and the sampling connecting end II (21) are connected with an electric meter circuit board (5) through a twisted pair (4); an anti-work magnetic interference circuit (6) is also arranged between the twisted pair (4) and the electric meter circuit board (5); the anti-electromagnetic interference circuit (6) comprises a filtering and differential amplifying circuit (61) and an isolating amplifying circuit (62), wherein the filtering and differential amplifying circuit (61) and the isolating amplifying circuit (62) are connected in series.
2. The manganin shunt resistant to electromagnetic interference of claim 1, wherein the first conductive sheet (1) and the second conductive sheet (2) are pure copper sheets.
3. The manganese-copper shunt resistant to electromagnetic interference according to claim 1, wherein the manganese-copper sheet (3) consists of the following components in parts by weight: 50 parts of manganese, 35 parts of copper, 10 parts of zinc, 0.8 part of lead, 0.7 part of boron, 0.5 part of iron, 0.2 part of beryllium and 0.1 part of bismuth.
4. The manganin shunt resistant to electromagnetic interference according to claim 1, wherein the filtering and differential amplifying circuit (61) comprises a low-pass filtering circuit (611) and a differential amplifying circuit (612), and the low-pass filtering circuit (611) and the differential amplifying circuit (612) are connected in series.
5. The manganin shunt resistant to electromagnetic interference according to claim 4, wherein the low-pass filter circuit (611) is composed of two RC low-pass filter circuits (6111) connected in parallel.
6. The manganin shunt resistant to electromagnetic interference according to claim 5, wherein the RC low-pass filter circuit (6111) is composed of two capacitors and one resistor.
7. The manganin shunt resistant to electromagnetic interference according to claim 4, wherein the differential amplification circuit (612) is composed of three dividing and detecting amplifiers (6121), and a plurality of capacitors are arranged between input signals of the dividing and detecting amplifiers (6121).
8. The manganin shunt resistant to electromagnetic interference and application thereof according to claim 4, wherein the differential amplification circuit (612) further comprises a plurality of power input circuits (613), and a power input pin of each power input circuit (613) is provided with an RC filter circuit (6131).
9. The manganin shunt resistant to electromagnetic interference and the application thereof according to claim 1, wherein the isolation amplifying circuit (62) is used for isolation transmission through a linear optical coupler.
10. Use of a manganin shunt resistant to electromagnetic interference according to any one of claims 1 to 9, wherein the use is a current sampling device of an electronic electric energy meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911169847.1A CN110836988A (en) | 2019-11-25 | 2019-11-25 | Manganese-copper current divider capable of resisting work magnetic interference and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911169847.1A CN110836988A (en) | 2019-11-25 | 2019-11-25 | Manganese-copper current divider capable of resisting work magnetic interference and application thereof |
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| CN110836988A true CN110836988A (en) | 2020-02-25 |
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| CN201911169847.1A Pending CN110836988A (en) | 2019-11-25 | 2019-11-25 | Manganese-copper current divider capable of resisting work magnetic interference and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358904A (en) * | 2021-04-30 | 2021-09-07 | 南方电网数字电网研究院有限公司 | Anti-interference device for electric energy meter and wiring method thereof |
| CN113587487A (en) * | 2021-07-30 | 2021-11-02 | 徐州领测半导体科技有限公司 | Semiconductor refrigerator with strong anti-interference performance and control method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323459A (en) * | 2011-08-12 | 2012-01-18 | 桐乡市伟达电子有限公司 | Alternating magnetic field-resistant manganin current divider |
| CN203881818U (en) * | 2013-12-11 | 2014-10-15 | 乐清市源文电子有限公司 | Manganin shunt |
| CN106093836A (en) * | 2016-06-22 | 2016-11-09 | 宁波三星医疗电气股份有限公司 | A kind of table meter power circuit |
| CN205921579U (en) * | 2016-08-25 | 2017-02-01 | 威胜集团有限公司 | Metering device who keeps apart sampling circuit and make with this circuit |
| CN106483412A (en) * | 2016-12-03 | 2017-03-08 | 河池学院 | A kind of electrical quantity composite measurement management system |
| CN206498377U (en) * | 2016-11-21 | 2017-09-15 | 国家电网公司 | The voltage x current Acquisition Circuit of photovoltaic module monitoring modular |
| CN107621561A (en) * | 2017-09-07 | 2018-01-23 | 宁波三星医疗电气股份有限公司 | A kind of antimagnetic electric energy meter of current sample power frequency |
| CN108226631A (en) * | 2017-12-27 | 2018-06-29 | 南昌市科陆智能电网科技有限公司 | A kind of single-phase measurement module of anti-magnetic interference |
| CN108508266A (en) * | 2018-04-02 | 2018-09-07 | 华立科技股份有限公司 | Manganese copper diverter and electronic electric energy meter |
-
2019
- 2019-11-25 CN CN201911169847.1A patent/CN110836988A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323459A (en) * | 2011-08-12 | 2012-01-18 | 桐乡市伟达电子有限公司 | Alternating magnetic field-resistant manganin current divider |
| CN203881818U (en) * | 2013-12-11 | 2014-10-15 | 乐清市源文电子有限公司 | Manganin shunt |
| CN106093836A (en) * | 2016-06-22 | 2016-11-09 | 宁波三星医疗电气股份有限公司 | A kind of table meter power circuit |
| CN205921579U (en) * | 2016-08-25 | 2017-02-01 | 威胜集团有限公司 | Metering device who keeps apart sampling circuit and make with this circuit |
| CN206498377U (en) * | 2016-11-21 | 2017-09-15 | 国家电网公司 | The voltage x current Acquisition Circuit of photovoltaic module monitoring modular |
| CN106483412A (en) * | 2016-12-03 | 2017-03-08 | 河池学院 | A kind of electrical quantity composite measurement management system |
| CN107621561A (en) * | 2017-09-07 | 2018-01-23 | 宁波三星医疗电气股份有限公司 | A kind of antimagnetic electric energy meter of current sample power frequency |
| CN108226631A (en) * | 2017-12-27 | 2018-06-29 | 南昌市科陆智能电网科技有限公司 | A kind of single-phase measurement module of anti-magnetic interference |
| CN108508266A (en) * | 2018-04-02 | 2018-09-07 | 华立科技股份有限公司 | Manganese copper diverter and electronic electric energy meter |
Non-Patent Citations (1)
| Title |
|---|
| 郭清营等: "新型电子式电能表用锰铜分流器的设计方法", 《电测与仪表》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358904A (en) * | 2021-04-30 | 2021-09-07 | 南方电网数字电网研究院有限公司 | Anti-interference device for electric energy meter and wiring method thereof |
| CN113587487A (en) * | 2021-07-30 | 2021-11-02 | 徐州领测半导体科技有限公司 | Semiconductor refrigerator with strong anti-interference performance and control method thereof |
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Application publication date: 20200225 |