CN106645863A - Voltage sensor based on dual fluxgates - Google Patents
Voltage sensor based on dual fluxgates Download PDFInfo
- Publication number
- CN106645863A CN106645863A CN201510721909.0A CN201510721909A CN106645863A CN 106645863 A CN106645863 A CN 106645863A CN 201510721909 A CN201510721909 A CN 201510721909A CN 106645863 A CN106645863 A CN 106645863A
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- magnetic core
- winding
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- bimag
- magnetic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
A voltage sensor based on dual fluxgates comprises four parts including a housing, a dual-fluxgate measuring head formed by dual magnetic core windings, a circuit board and a shielding case. The dual fluxgates formed by dual magnetic core windings, the circuit board and the shielding case are arranged in the housing. The upper cover and the lower cover of the housing are buckled to form one body. The magnetic cores of the dual magnetic core windings are made of rectangular hysteresis materials with high magnetic conductivity and low residual magnetism. The two magnetic cores constitute two fluxgate probes. Two wires are wound around each magnetic core winding to form an excitation winding and a detection winding respectively. The windings in the dual magnetic core windings are connected in parallel with a square wave signal generator to generate saturated magnetic flux in the dual magnetic core windings. The detection winding arranged on each magnetic core can detect the magnetic flux in each magnetic core. Each detection winding is provided with an equal resistance load. An oscillation current waveform in the excitation winding can be reproduced on the resistor.
Description
Technical field
The present invention relates to a kind of voltage sensor, especially a kind of voltage sensor based on double Fluxgate Techniques.
Background technology
Measurement voltage has a variety of methods, and for measurement exchange, the use of AC voltage transformer is very universal.For measurement DC voltage, hall principle is typically used for, by measuring electric current voltage is measured indirectly, or voltage is measured with linear optical coupling.The method of each measurement voltage has its advantage and shortcoming.
Such as, D.C mutual-inductor is only used for measuring alternating voltage, and the isolation effect of linear optical coupling is not good, pressure relatively low.The accurate measurement of combined-voltage how could be met can meet the requirement of high-insulation and quick response and low-power consumption again, either in industrial control field or fields of measurement, all meet these requirements in the urgent need to finding a kind of reliably device.
Intelligent grid achieved in recent years swift and violent development, and the accurate measurement of voltage is also very urgent task.The task proposes claimed below：Voltage sensor will can measure DC voltage and can measure alternating voltage again, and band requirement can reach 13Khz or higher, and input current is less than 0.1mA, and certainty of measurement is not less than 0.5%.In the market without the product that can fully meet the requirement, need as requested using the technological means different from commonly using product on market, fundamentally solve the various problems that at present measurement product of voltage is present.
The content of the invention
It is an object of the invention to provide a kind of high frequency band, can measure alternating voltage can measure DC voltage again, and stability is high, low input current, high accuracy, the voltage sensor of Low Drift Temperature.
To achieve these goals, the present invention is adopted the following technical scheme that：A kind of voltage sensor based on double Fluxgate Techniques, it is most of including shell, double fluxgate measurement heads of bimag winding composition, circuit board, radome four, double fluxgates, circuit board and the radome that the bimag winding is constituted is arranged on inside the shell, it is integrated by the upper and lower cover latch of shell, the magnetic core of the bimag winding is that the rectangular hysteresis material of the low remanent magnetism of high magnetic conduction is constituted, two magnetic cores constitute two fluxgate magnetic cores, are wound with two groups of coilings in two magnetic core windings respectively and encourage winding and detection winding.Winding parallel in the bimag winding accesses square wave signal generator, produce saturation flux amount respectively in bimag winding, the detection winding being arranged on each magnetic core can respectively detect the magnetic flux in each magnetic core, two detection windings take respectively an equal ohmic load, you can the oscillating current waveform in excitation winding is reproduced on resistance.When measured electric current is zero, resultant voltage is zero, if input current is not zero, resultant voltage is not zero, the size of its quadratic component energy accurate response input current, and this is the general principle of fluxgate.The resultant voltage can be exaggerated after filtering and directly export, this is open loop fluxgate principle, if feedback promotes bucking coil after the resultant voltage amplifies, the magnetic flux that bucking coil is produced is equal in magnitude in opposite direction with the magnetic flux that primary current is produced, so as to resultant flux is zero, now compensating size of current can reflect primary current size, and this is closed loop fluxgate principle.Resultant voltage or compensation electric current can be changed by arranging signaling conversion circuit on circuit boards by signal, export the voltage or current signal synchronous with primary current, and final by lead-out terminal output.
Preferably, double fluxgate principles that the invention product is constituted using bimag.
Preferably, described each magnetic core of bimag winding has 2 windings, an excitation winding, a detection winding.
Preferably, the magnetic core in the magnetic core be annular there is no otch, there is no leakage field.
Preferably, the radome is arranged on the outside of bimag winding and using high magnetic conduction soft magnetic materials, and antijamming capability is improved.
As a result of above-mentioned technical proposal, the present invention has the advantages that：Double fluxgate principles of bimag winding composition are present invention employs, impact of the exciting curent to primary current is eliminated, by the voltage difference for comparing two fluxgate magnetic core output, can obtain being proportional to the difference voltage signal of primary current, precision is greatly improved.Extremely small current value can be measured, therefore only needs to little former limit number of turn, coordinate larger input resistance value to be capable of achieving stably measured voltage, because the former limit number of turn is low, therefore frequency has also obtained very big lifting, while also achieving the requirement of extremely low input power consumption.Built-in high magnetic conduction radome, can be greatly lowered the impact of earth magnetism and external interference.
Specific embodiment
Referring to the drawings 1 to 3, a kind of voltage sensor based on bimag Fluxgate Technique.The principle of bimag fluxgate：Magnetic core 1001 and winding We1 constitute a magnetic core winding, and magnetic core 1002 and We2 constitute a winding, and the model of two magnetic cores, size and material parameter are completely the same, and the excitation We1 of winding 1003 and 1004 We2 is two groups of number of turn identical windings, and parameter is consistent.Square-wave generator produces square-wave signal, the mutually symmetrical with reverse access of two excitation coils, namely make the opposite polarity of two excitation coils, square-wave voltage enters two We1 of excitation coil 1003 and 1004 We2, then on another Wd1 of detection coil 1005 and 1006 Wd2 of magnetic core detect two voltages Ud1 and Ud2 respectively, the two polarity of voltages conversely, in 1007 input current IP=0, the resultant voltage of Ud1 and Ud2 and be zero in theory.With reference to Fig. 2, when voltage is not zero, when being namely not zero by the electric current of resistor voltage divider network Ri, due to the saturation direction of a magnetic core winding 1001 and the saturation direction of another magnetic core 1002 it is different, it is respectively positive saturation in advance and reverse saturation in advance, the resultant voltage of the voltage Ud1 that induction coil Wd1 and Wd2 is induced and Ud2 also will not be zero.It is uneven to cause the second harmonic composition in the presence that its asymmetric reason is second harmonic, that is, the resultant voltage of Ud1 and Ud2 result in, and the size of the second harmonic reflects the size of primary current Ip.By arranging a second harmonic processing unit 1009, second harmonic is carried out into process can obtain identical with primary current IP directions, the voltage signal being in proportion.Signal after process can be exported directly after the amplification of amplifier 1010, and this is the principle of opened loop control.If promoting compensation circuit 1013 after 1010 amplifiers amplify, produce the compensation electric current contrary with the former limit Ip sense of current, and make the magnetic field that compensation electric current Is is produced contrary with the magnetic field size equidirectional that Ip is produced, now compensate electric current the Is voltage that obtains and primary current Ip on the measurement Rm of resistance 1012 be it is proportional follow relation, this is the principle of closed-loop control
The present invention adopts bimag to constitute double fluxgates, and core structure has particularity, it is desirable to which two magnetic core models are identical, and winding parameter is consistent, but opposite polarity.Its installation process can refer to Fig. 3, and two magnetic core windings are put in shielding case 2003, are fixed on printed circuit board (PCB) 2002, and electronic circuit is provided with printed circuit board (PCB) for signal transacting, and outer casing upper cover 2004 is plastic material with lower cover 2004, and electric insulation is good.Input voltage enters housing through input terminal 2006, and the output signal and power supply after process is realized by terminal 2007.
It is an advantage of the invention that：（1）Two magnetic core windings constitute double fluxgates, take the second harmonic signal after synthesis, and signal to noise ratio is greatly improved；（2）Primary and secondary side is isolated, and high-insulation is advantageous for measurement voltage signal.（3）Sensitivity is high, can measure small voltage and current signal；（4）Good temp characteristic, Low Drift Temperature meets stably measured requirement.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, the change and variation of other multi-forms can also be made on the basis of the above description.Here all of embodiment cannot be exhaustive.It is every to belong to obvious change that technical scheme amplifies out or change row still in protection scope of the present invention.
Claims (5)
1. a kind of voltage sensor based on bimag Fluxgate Technique, it is characterized in that, the double fluxgate structures constituted using bimag winding, most of including shell, magnetic core winding, circuit board, radome four, the magnetic core winding, circuit board and radome are arranged at enclosure, are integrated by the cover latch up and down of shell, internal embedding, the magnetic core winding employs bimag structure, and the radome adopts high magnetic conduction soft magnetic materials, the core material to adopt the rectangular hysteresis material of high magnetic conduction.
2. a kind of voltage sensor based on bimag Fluxgate Technique according to claim 1, it is characterised in that the magnetic core winding has excitation winding and detection winding.
3. a kind of voltage sensor based on bimag Fluxgate Technique according to claim 1, it is characterised in that the magnetic core using the easy saturation of high magnetic conduction rectangular hysteresis material.
4. a kind of voltage sensor based on bimag Fluxgate Technique according to claim 1, it is characterised in that the bimag winding is arranged in radome.
5. a kind of voltage sensor based on bimag Fluxgate Technique according to claim 1, it is characterised in that the radome uses permalloy high permeability material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510721909.0A CN106645863A (en) | 2015-10-30 | 2015-10-30 | Voltage sensor based on dual fluxgates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510721909.0A CN106645863A (en) | 2015-10-30 | 2015-10-30 | Voltage sensor based on dual fluxgates |
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| CN106645863A true CN106645863A (en) | 2017-05-10 |
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| CN201510721909.0A Pending CN106645863A (en) | 2015-10-30 | 2015-10-30 | Voltage sensor based on dual fluxgates |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107340418A (en) * | 2017-07-12 | 2017-11-10 | 西安交通大学 | A kind of quasi- DIGITAL FREQUENCY modulation fluxgate current sensor |
| CN107356800A (en) * | 2017-07-04 | 2017-11-17 | 西安交通大学 | The high-current detector and method of a kind of magnetic field cancellation |
| CN109444513A (en) * | 2018-12-05 | 2019-03-08 | 三峡大学 | A kind of bimag Low Drift Temperature Hall current sensor |
| CN110031666A (en) * | 2019-05-10 | 2019-07-19 | 武汉大学 | A kind of large direct current measuring device and measurement method |
| CN110146832A (en) * | 2019-06-25 | 2019-08-20 | 宁波中车时代传感技术有限公司 | A kind of micro fluxgate sensor |
| CN111157776A (en) * | 2020-01-14 | 2020-05-15 | 清华大学 | Double-magnetic-core sensor for insulation leakage current of power equipment |
| CN111157777A (en) * | 2020-01-14 | 2020-05-15 | 清华大学 | Design method of double-magnetic-core differential leakage current measurement sensor |
| CN112986654A (en) * | 2021-02-10 | 2021-06-18 | 南方电网科学研究院有限责任公司 | Current measuring device of broadband alternating current and direct current |
| CN114660347A (en) * | 2022-03-23 | 2022-06-24 | 宁波希磁电子科技有限公司 | Current sensor |
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| CN203672938U (en) * | 2013-11-06 | 2014-06-25 | 北京柏艾斯科技有限公司 | AC-DC universal leakage-current sensor |
| CN203786189U (en) * | 2014-05-06 | 2014-08-20 | 宁波希磁电子科技有限公司 | Dual-magnetic core current sensor |
| CN104515931A (en) * | 2014-12-26 | 2015-04-15 | 华中科技大学 | Direct-current leakage current sensor based on magnetic modulation |
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2015
- 2015-10-30 CN CN201510721909.0A patent/CN106645863A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203672938U (en) * | 2013-11-06 | 2014-06-25 | 北京柏艾斯科技有限公司 | AC-DC universal leakage-current sensor |
| CN203786189U (en) * | 2014-05-06 | 2014-08-20 | 宁波希磁电子科技有限公司 | Dual-magnetic core current sensor |
| CN104515931A (en) * | 2014-12-26 | 2015-04-15 | 华中科技大学 | Direct-current leakage current sensor based on magnetic modulation |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356800A (en) * | 2017-07-04 | 2017-11-17 | 西安交通大学 | The high-current detector and method of a kind of magnetic field cancellation |
| CN107340418A (en) * | 2017-07-12 | 2017-11-10 | 西安交通大学 | A kind of quasi- DIGITAL FREQUENCY modulation fluxgate current sensor |
| CN107340418B (en) * | 2017-07-12 | 2019-10-11 | 西安交通大学 | A kind of quasi- DIGITAL FREQUENCY modulation fluxgate current sensor |
| CN109444513A (en) * | 2018-12-05 | 2019-03-08 | 三峡大学 | A kind of bimag Low Drift Temperature Hall current sensor |
| CN110031666A (en) * | 2019-05-10 | 2019-07-19 | 武汉大学 | A kind of large direct current measuring device and measurement method |
| CN110031666B (en) * | 2019-05-10 | 2021-04-16 | 武汉大学 | Direct current heavy current measuring device and measuring method |
| CN110146832B (en) * | 2019-06-25 | 2020-03-31 | 宁波中车时代传感技术有限公司 | Miniature fluxgate sensor |
| WO2020258688A1 (en) * | 2019-06-25 | 2020-12-30 | 宁波中车时代传感技术有限公司 | Micro-fluxgate sensor |
| CN110146832A (en) * | 2019-06-25 | 2019-08-20 | 宁波中车时代传感技术有限公司 | A kind of micro fluxgate sensor |
| CN111157776A (en) * | 2020-01-14 | 2020-05-15 | 清华大学 | Double-magnetic-core sensor for insulation leakage current of power equipment |
| CN111157777A (en) * | 2020-01-14 | 2020-05-15 | 清华大学 | Design method of double-magnetic-core differential leakage current measurement sensor |
| CN112986654A (en) * | 2021-02-10 | 2021-06-18 | 南方电网科学研究院有限责任公司 | Current measuring device of broadband alternating current and direct current |
| CN112986654B (en) * | 2021-02-10 | 2022-05-03 | 南方电网科学研究院有限责任公司 | Current measuring device of broadband alternating current and direct current |
| CN114660347A (en) * | 2022-03-23 | 2022-06-24 | 宁波希磁电子科技有限公司 | Current sensor |
| CN114660347B (en) * | 2022-03-23 | 2023-01-20 | 宁波希磁电子科技有限公司 | Current sensor |
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