CN103852619A - Open type current sensor based on closed loop fluxgate technology - Google Patents
Open type current sensor based on closed loop fluxgate technology Download PDFInfo
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- CN103852619A CN103852619A CN201210515423.8A CN201210515423A CN103852619A CN 103852619 A CN103852619 A CN 103852619A CN 201210515423 A CN201210515423 A CN 201210515423A CN 103852619 A CN103852619 A CN 103852619A
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Abstract
The invention discloses an open type current sensor based on a closed loop fluxgate technology. The current sensor can carry out measurement within a large range, and is based on the magnetic compensation zero-flux closed loop fluxgate technology, open type installation is achieved, the sensor has the advantages of being large in caliber, wide in current range, high in precision in the whole process, capable of measuring alternating currents and direct currents, small in temperature drift and the like, and the requirements for measurement on uninterruptible-power currents and high-precision measurement within the whole rated current range in the industrial field can be met well.
Description
Technical field
The present invention relates to a kind of open-type current sensor of measuring ac and dc current based on closed loop Fluxgate Technique, the open-type that is particularly useful for high precision gamut electric current is installed and is measured.
Background technology
At industrial circle, have a lot of occasions need to measure electric current at present, especially require measurement in large electric current gamut, to require high linearity from little electric current, temperature is floated little requirement and is difficult to be met.There is the method for a variety of measurement electric currents based on prior art, such as shunt, mutual inductor, Hall element, Rogowski coil, magnetic modulation direct current instrument transformer etc.Each measuring principle has its feature and advantage.Such as current transformer is based on electromagnetic induction principle, can only measure in theory alternating current, can not measure DC current.But shunt self is very simple need to be linked into primary current loop, can produce insertion loss, when electric current is larger, can produce a large amount of heats, and the measuring junction of shunt do not isolate with former limit, is easy to double measurement circuit to produce and endanger.Hall element can be measured direct current and alternating current, can be divided into open loop principle and closed loop principle, no matter but the Hall element of any principle, the problem that temperature is floated is not easy to solve all the time, and zero point, imbalance was also more serious.The features such as Rogowski coil has many good qualities in the use, simple such as installing, and measurement range is wide, but theoretically, Rogowski coil can only be measured interchange, also responsive not for low-frequency current signal, and post processing electric circuit is had relatively high expectations.What magnetic modulating current sensor adopted is a kind of current sensor that adopts Fluxgate Technique, has precision high, and the linearity is high, to temperature-insensitive, can measure the feature of Weak current.But what existing magnetic modulating current sensor adopted is all open loop principle, there is no secondary current compensation, magnetic core is operated in magnetic saturation state, therefore can not make open-type magnetic core, also just can not install by open-type.This simple magnetic modulation technique is before a lot of years, and domestic manufacturer all can produce, but because its principle is limit, tested electric current can not be too large, is conventionally no more than more than 10 amperes.
By above-mentioned analysis, several prior aries on market all can not meet the requirement to all accurately measuring to large electric current from little electric current.Such as discharging and recharging of pure electric automobile accumulator just requires current sensor to floating current and charging and discharging currents, all can measure accurately, now above-mentioned several prior aries all can not meet the demands.
Some occasion does not allow to disconnect primary current loop, now needs current sensor to possess the feature that opening is installed.
In sum, industrial circle needs one can installation and maintenance easy, can measure interchange and can measure again direct current, can measure little electric current, can measure hundreds of again and pacify the current sensor of large electric current, and preferably open-type is installed.
The present invention adopts closed loop fluxgate principle, and possesses the feature that open-type is installed, and both can measure extra small electric current, can measure again large electric current, and whole process has fabulous linearity, to temperature-insensitive.
Summary of the invention
Cannot meet the accurately measuring and requirement that open-type is installed of electric current on a large scale in order to overcome prior art, the problem that the present invention need to solve is, open-type is installed, and measures from Weak current to large electric current, and very little temperature is floated, very little zero deviation.
The present invention is a kind of open-type current sensor based on closed loop Fluxgate Technique.By mating the compensating coil of the different numbers of turn, can obtain the range of different current measurements.Sensor can be measured very little electric current and pacify large electric current to hundreds of, and whole process has the higher linearity.Be closed loop magnetic compensation Fluxgate Technique due to what adopt, therefore it is fast to have the reaction time, measure electric current large, temperature is floated little feature.
Principle of the present invention:
The present invention is based on closed loop fluxgate principle, utilize in the magnetic core 1002 by there is air gap at an open-type and embed magnetic flux detecting coil 1003, this coil 1003 is connected with a square-wave generator 1004, waveform generator can periodically produce square wave, and then constantly by two-way the bar magnet in coil 1,003 1010 magnetization saturated.When large electric current 1001 Ip in former limit pass through, the magnetic flux Φ of generation
pcan exert an influence to the degree of saturation of bar magnet, and then affect its inductance value, also can there is asymmetry change in its output waveform, and this asymmetric variation, after the arrangement of amplification treatment circuit 1005, is adjusted driving circuit 1007, produces offset current I
s, this electric current produces magnetic flux Φ by the second compensation coil 1006 on high permeability magnetic core 1002
s, as long as Φ
p+ Φ
svector is not equal to zero, just further adjusts driving circuit 1007, until Φ
p+ Φ
svector equals zero, the ultimate principle that Here it is " closed loop ".Now I
scan accurately react primary current 1001 Ip, its pass is Ip=Ns * Is, and wherein Ns is the number of turn of second compensation coil 1006.Is, after measuring resistance 1008 Rm, to its voltage sampling, enters Circuit tuning 1009 and carries out the regulation of electrical circuit, the signal interface that meets Industry Control requirement of outputting standard, as DC0-5V, DC0-10V, DC4-20mA or other digital interfaces, as MODBUS, CANBUS etc.
The principal character that the present invention is different from prior art is: the present invention has used closed loop Fluxgate Technique, has adopted opening field engineering, has solved insurmountable little electric current in prior art and has measured with large electric current simultaneously, a difficult problem that simultaneously requires opening to install.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Fig. 2 is structural drawing of the present invention.
Fig. 3 is stereo appearance figure.
Description of symbols in figure:
Accompanying drawing 1:
1001 primary current Ip; 1002 band air gap magnetic cores; 1003 magnetic flux detecting coils; 1004 square-wave generators; 1005 amplification treatment circuits; 1006 second compensation coils; 1007 driving circuits; 1008 measuring resistance Rm; 1009 Circuit tunings; 1010 magnetic fluxs are surveyed bar magnet;
Accompanying drawing 2:
2001 sensor upper covers; 2002 trip bolts; The 2003 open core first halves; 2004 iron core gib screws; 2005 sensor base; 2006 sensor localization projections 1; 2007 sensor localization projections 2; 2008 sensor base mounting holes; 2009 open core Lower Halves; 2010 compensating coil windings 1; 2011 compensating coil windings 2; 2012 circuit boards; 2013 connection terminals; 2014 circuit board gib screws; 2015 sensor localization pits; 2016 compensating coil windings 3; 2017 sensor side panel mounting holes.
Embodiment
For clearer and more definite explanation technical characterictic of the present invention, further illustrate below in conjunction with accompanying drawing method and the step that its technology realizes.
With reference to accompanying drawing 2, patent of the present invention has two large divisions, and Part I is sensor upper cover 2001 and sensor base 2005.
Upper and lower two parts 2001 and 2005 of the present invention are by two trip bolts 2002 current sensor that links into an integrated entity.This open type structure, be applicable to can not power-off occasion.
The first half 2003 of open-type magnetic core and the latter half 2009 of magnetic core are fixed on respectively the first half 2001 and the latter half 2005 of sensor with iron core trip bolt 2004 and 2014.
Engaging by inserting and stack after high-permeability material riveted between open core 2003 and 2009, has the tight not feature of leakage field that engages.
Compensating coil winding 2010,2011,2016 are fixed on respectively symmetrical part and the middle, bottom of open magnetic core 2009, and the benefit of doing is like this opening part of the as far as possible close magnetic core of compensating coil winding, thereby make the magnetic field in magnetic core more even, sensor measurement electric current is more accurate.
In order to guarantee that sensor top and the bottom can engage accurately, be provided with 2006 and 2,007 two positioning convex in the bottom of sensor, be provided with 2015 location pits in the first half of sensor accordingly.Such two sensors just can clog-free smooth joint, guarantees that magnetic core two parts can be without importing and engage smoothly under manual intervention.
2008 base installing holes of sensor the latter half are for this sensor being installed on panel paper and reserve.
The 2017 side panel mounting holes of sensor the latter half are for this sensor being installed on side panel and reserve.
2018 potentiometers of sensor the latter half are used for adjusting sensor output, and sensor output is adjusted in to certain fixed value.
2013 connection terminals of sensor the latter half are for output signal and sensor power supply, and this terminal is replaceable is if desired cable conductor, can accomplish waterproof and dampproof effect completely after so overall embedding.
The upper and lower two parts of sensor carry out embedding processing after assembling completes.
Claims (10)
1. the open-type current sensor based on closed loop Fluxgate Technique, its principal character is the closed loop Fluxgate Technique that has adopted magnetic compensation zero magnetic flux, the stacked riveted magnetic core of high permeability opening, realize magnetic circuit substantially closed, and realize open-type installation, this current sensor is divided into two parts and can coordinates by concavo-convex location, link together with screw, circuit board welds together by the contact pin on its skeleton with the compensating coil winding of the identical number of turn of symmetric offset spread, the magnetic field that the magnetic field that the primary current of one or more wires carry produces and second compensation winding produce offsets, in magnetic circuit, magnetic flux is zero, the signal of end reaction primary current feature and sensor power supply are by connection terminal 2013 or cable tail output and access, the embedding of sensor entirety realizes waterproof and dampproof.
2. a kind of open-type current sensor based on closed loop Fluxgate Technique according to claim 1, is characterized in that it is closed loop Fluxgate Technique that this invention has been used magnetic compensation zero magnetic flux technology.
3. a kind of open-type current sensor based on closed loop Fluxgate Technique according to claim 1, is characterized in that this invention is used open-type magnetic core.
4. a kind of open-type current sensor based on closed loop Fluxgate Technique according to claim 3, is characterized in that the magnetic core that this invention is used is stacked riveted construction.
5. a kind of open-type current sensor based on closed loop Fluxgate Technique according to claim 1, is characterized in that the upper and lower two parts composition of this sensor, fixes with screw.
6. a kind of open-type current sensor based on closed loop Fluxgate Technique according to claim 1, is characterized in that the upper and lower two parts composition of this sensor, engages and realizes location with mutual convex-concave.
7. a kind of open-type current sensor based on closed loop Fluxgate Technique according to claim 1, is characterized in that the skeleton of this sensor is symmetrical mounting structure, and the number of turn is identical.
8. a kind of open-type current sensor based on closed loop Fluxgate Technique according to claim 1, is characterized in that this sensor adopts overall embedding to realize waterproof and dampproof.
9. a kind of open-type current sensor based on closed loop Fluxgate Technique according to claim 1, is characterized in that this sensor output adopts terminal or cable.
10. a kind of open-type current sensor based on closed loop Fluxgate Technique according to claim 1, is characterized in that this sensor has used the core material of high permeability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210515423.8A CN103852619A (en) | 2012-12-05 | 2012-12-05 | Open type current sensor based on closed loop fluxgate technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210515423.8A CN103852619A (en) | 2012-12-05 | 2012-12-05 | Open type current sensor based on closed loop fluxgate technology |
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| CN103852619A true CN103852619A (en) | 2014-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210515423.8A Pending CN103852619A (en) | 2012-12-05 | 2012-12-05 | Open type current sensor based on closed loop fluxgate technology |
Country Status (1)
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301331A (en) * | 2015-11-24 | 2016-02-03 | 山东航天电子技术研究所 | Novel Hall sensor skeleton |
| CN108627685A (en) * | 2017-03-24 | 2018-10-09 | Abb瑞士有限公司 | Monitoring attachment for the electrical equipment for being provided with connecting terminal |
| CN109596512A (en) * | 2019-01-10 | 2019-04-09 | 珠海多创科技有限公司 | A kind of measurement method of interior of articles direct current Weak current |
| CN110133355A (en) * | 2019-05-17 | 2019-08-16 | 中国科学院上海应用物理研究所 | A kind of magnetic modulation current sensor and preparation method thereof |
| CN110763902A (en) * | 2019-11-04 | 2020-02-07 | 武汉大学 | High-precision arbitrary waveform electromagnetic current transformer and measuring method |
| CN112415249A (en) * | 2020-11-09 | 2021-02-26 | 武汉大学 | Zero-flux current transformer and error modulation method |
| CN114034896A (en) * | 2021-11-15 | 2022-02-11 | 中国南方电网有限责任公司超高压输电公司柳州局 | Current multiplication device, control method and control device |
| WO2023089475A1 (en) * | 2021-11-17 | 2023-05-25 | Eldor Corporation S.P.A. | Common mode filtering device and charging system for electric or hybrid vehicles |
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| CN1957261A (en) * | 2004-07-16 | 2007-05-02 | 机电联合股份有限公司 | Current sensor |
| CN101925825A (en) * | 2008-01-25 | 2010-12-22 | 机电联合股份有限公司 | Current sensor |
| CN102422174A (en) * | 2009-05-11 | 2012-04-18 | 机电联合股份有限公司 | Closed-loop fluxgate current sensor |
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Patent Citations (4)
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| CN1957261A (en) * | 2004-07-16 | 2007-05-02 | 机电联合股份有限公司 | Current sensor |
| DE102005028572A1 (en) * | 2005-06-21 | 2006-12-28 | Vacuumschmelze Gmbh & Co. Kg | Fold magnetic core for hall sensor arrangement, has air gap bridged by yoke bodies overlapping with side pieces, where specific distance exhibits between bodies and pieces, and space provided between fold positions |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301331A (en) * | 2015-11-24 | 2016-02-03 | 山东航天电子技术研究所 | Novel Hall sensor skeleton |
| CN108627685A (en) * | 2017-03-24 | 2018-10-09 | Abb瑞士有限公司 | Monitoring attachment for the electrical equipment for being provided with connecting terminal |
| CN108627685B (en) * | 2017-03-24 | 2022-07-26 | 泰连服务有限公司 | Monitoring accessory for an electrical apparatus provided with a terminal |
| CN109596512A (en) * | 2019-01-10 | 2019-04-09 | 珠海多创科技有限公司 | A kind of measurement method of interior of articles direct current Weak current |
| CN109596512B (en) * | 2019-01-10 | 2021-06-08 | 珠海多创科技有限公司 | Method for measuring direct current micro current in object |
| CN110133355A (en) * | 2019-05-17 | 2019-08-16 | 中国科学院上海应用物理研究所 | A kind of magnetic modulation current sensor and preparation method thereof |
| CN110133355B (en) * | 2019-05-17 | 2021-08-13 | 中国科学院上海应用物理研究所 | Magnetic modulation current sensor and manufacturing method thereof |
| CN110763902A (en) * | 2019-11-04 | 2020-02-07 | 武汉大学 | High-precision arbitrary waveform electromagnetic current transformer and measuring method |
| CN112415249A (en) * | 2020-11-09 | 2021-02-26 | 武汉大学 | Zero-flux current transformer and error modulation method |
| CN114034896A (en) * | 2021-11-15 | 2022-02-11 | 中国南方电网有限责任公司超高压输电公司柳州局 | Current multiplication device, control method and control device |
| CN114034896B (en) * | 2021-11-15 | 2024-05-24 | 中国南方电网有限责任公司超高压输电公司柳州局 | Current multiplying device, control method and control device |
| WO2023089475A1 (en) * | 2021-11-17 | 2023-05-25 | Eldor Corporation S.P.A. | Common mode filtering device and charging system for electric or hybrid vehicles |
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