CN105572456A - AC/DC fluxgate current sensor - Google Patents
AC/DC fluxgate current sensor Download PDFInfo
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- CN105572456A CN105572456A CN201610135620.5A CN201610135620A CN105572456A CN 105572456 A CN105572456 A CN 105572456A CN 201610135620 A CN201610135620 A CN 201610135620A CN 105572456 A CN105572456 A CN 105572456A
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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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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Abstract
Provided is an AC/DC fluxgate current sensor, which comprises a fluxgate detection probe and a signal processing circuit. The fluxgate detection probe is formed by a main magnetic core, a magnetic gathering magnetic core, an excitation winding, a feedback winding and a secondary side winding. The signal processing circuit is formed by an exciting circuit and a zero magnetic flux detection circuit. The exciting circuit comprises an excitation signal generation circuit and a signal drive circuit. The excitation signal generation circuit has a sampling resistor. The zero magnetic flux detection circuit comprises an integral comparator circuit and an H-bridge drive circuit.
Description
Technical field:
The present invention belongs to the device measuring electric current, specifically a kind of fluxgate current sensor.
Background technology
Fluxgate current sensor is current sensor as a kind of electric isolution, by means of its uniqueness magnetic inductive capacity, to the feature applying magnetic field high sensitivity, high precision and miniaturization, there is outstanding research and development and application advantage comparatively speaking.
Existing fluxgate current sensor comprises a toroidal core and excitation winding, feedback winding, and this magnetic core presents periodically saturated and undersaturated condition under the effect of alternating excitation magnetic field, thus detects direct current and low-frequency ac based on fluxgate principle;
Existing fluxgate sensor has excitation winding and feeds back winding quadrature arrangement and the two kinds of modes that are arranged in parallel, existing be usually used in current detecting be excitation winding and feedback winding parallel arrange mode, but this arrangement, the magnetic field that excitation winding and feedback winding produce intercouples, and affects measuring accuracy.The fluxgate current sensor of this arrangement simultaneously, is only applicable to detect direct current and low-frequency ac.
Excitation winding and feedback winding adopt quadrature arrangement mode, although can overcome magnetic field to intercouple phenomenon, the magnetic field produced due to electric current in this arrangement is open circuit, causes magnetic resistance very large, therefore be only applicable to the measurement of low-intensity magnetic field, not yet have the precedent for current detecting.The present invention is based on the shortcoming of two kinds of sensors, propose the mode fluxgate current sensor of a kind of employing for current detecting excitation winding and feedback winding quadrature arrangement, introduce poly-magnetic magnetic core simultaneously, reach the object detecting high-frequency ac.
The Chinese patent application CN104808042A of applicant's earlier application discloses a kind of fluxgate sensor adopting quadrature arrangement, the probe of fluxgate sensor disclosed in the document adds toroidal core by a poly-magnetic shell and encourages winding to add secondary feedback winding and forms, the error in measuring process can be eliminated, improve measuring accuracy, but the detection bandwidth of this fluxgate sensor is still narrower, cannot detect high-frequency alternating current.
Therefore provide one can overcome above-mentioned prior art defect, can measurement, accuracy of detection is high, and the larger fluxgate current sensor of range becomes problem demanding prompt solution in prior art.
Summary of the invention
For solving the problems of the technologies described above, employing motor technology scheme of the present invention is:
A kind of alternating current-direct current fluxgate current sensor is provided, described alternating current-direct current fluxgate current sensor, comprise fluxgate detection probe 7 and signal processing circuit 16, it is characterized in that described fluxgate detection probe is made up of a main magnetic core 1, poly-magnetic magnetic core 2, excitation winding 4, feedback winding 5 and secondary side winding 6;
Main magnetic core and poly-magnetic magnetic core are ring type magnetic core, poly-magnetic magnetic core is enclosed within main magnetic core outside and both are coaxial, excitation winding is the winding that solid conductor is formed along main magnetic core circumferencial direction uniform winding, secondary side winding is the winding that the solid conductor edge radial uniform winding of poly-magnetic magnetic core is formed, and feedback winding is that solid conductor edge is to winding toroidal core 1 and poly-magnetic magnetic core 2 are wound in the lump;
Signal processing circuit 16 is made up of exciting circuit 14 and Zero-flux sensing circuit 15;
Exciting circuit comprises exiting signal generating circuit 10 and signal drive circuit 11, has sampling resistor Rs in exiting signal generating circuit, and the output terminal of exiting signal generating circuit 10 is connected to the input end of signal drive circuit 11;
Excitation winding 4 one end is connected with the input end of exiting signal generating circuit and through sampling resistor ground connection, the other end is connected to signal drive circuit 11 output terminal;
Zero-flux sensing circuit 15 comprises integral contrast device circuit 12 and H-bridge drive circuit 13, has measuring resistance Rf in H-bridge drive circuit;
The input end of integral contrast device circuit 12 is connected with the output terminal of signal drive circuit 11, the output terminal of integral contrast device circuit is connected with the input end of H-bridge drive circuit 13, the output terminal of H-bridge drive circuit 13 connects one end of feedback winding 5, the other end of feedback winding 5 is by the measuring resistance Rf ground connection in H-bridge drive circuit 13, the other end of feedback winding 5 is also connected to the secondary side winding 6 in fluxgate detection probe 7 simultaneously, the other end ground connection of secondary side winding 6.
Described alternating current-direct current fluxgate current sensor, is characterized in that the height H of main magnetic core
1with the height H of poly-magnetic magnetic core
2equal.The internal diameter d of poly-magnetic magnetic core
2the outer diameter D of main magnetic core
1, d
2-D
1≤ 2mm.
Described alternating current-direct current fluxgate current sensor, is characterized in that described exiting signal generating circuit is selected from the one in square-wave signal generation circuit, triangular signal circuit for generating, sine wave signal circuit for generating, is preferably square-wave signal generation circuit.
Described square-wave signal generation circuit employing model is the square-wave signal generation chip of LM6132.
Described signal drive circuit adopts model to be the power amplifier chip of IR2101s.
Described integral contrast device circuit adopts model to be TLC2652 integral contrast device chip.
The invention provides alternating current-direct current fluxgate current sensor and there is following beneficial effect:
(1) traditional fluxgate current sensor comprises a toroidal core, this magnetic core presents periodically saturated and undersaturated condition under the effect of alternating excitation magnetic field, thus detect direct current and low-frequency ac based on fluxgate principle, realize the function of conventional fluxgate current sensor; Be different from the structure & working mechanism of conventional fluxgate, alternating current-direct current fluxgate current sensor (hereinafter referred to as sensor) provided by the invention is on the basis of conventional fluxgate current sensor, by excitation winding and the mode feeding back winding quadrature arrangement, effectively reduce the coupling between two magnetic fields; Introduce a poly-magnetic magnetic core simultaneously, effectively assemble the magnetic field that excitation winding produces, decrease the ampere turns of excitation winding, and effectively can shield the interference of extraneous stray magnetic field, reduce the volume of sensor probe, improve its detection sensitivity and antijamming capability.
(2) add secondary side winding, make sensor can also measure intermediate frequency and high-frequency ac current, extend the bandwidth of current measurement.
(3) mode of the feedback winding wound up in the lump by two magnetic cores along magnetic core radial direction and the excitation winding omnidirectional distribution along the winding of toroidal core circumferencial direction is adopted, the magnetic field that two windings are produced effectively to be gathered in toroidal core and orthogonal, reach and reduce magnetic potential and the object removing the coupling between two magnetic fields, thus improve the sensitivity of sensor, measuring accuracy, the linearity, reduce the impact of hysteresis on sensor.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of the alternating current-direct current fluxgate current sensor that the specific embodiment of the invention provides;
Fig. 2 is the fluxgate detection probe structural representation of the alternating current-direct current fluxgate current sensor that the specific embodiment of the invention provides;
Fig. 3 is the exciting circuit schematic diagram of the alternating current-direct current fluxgate current sensor that embodiment provides.
Fig. 4 is the integral contrast device circuit diagram of the alternating current-direct current fluxgate current sensor that embodiment provides.
Fig. 5 is the alternating current-direct current fluxgate current sensor input-output characteristic curve comparison diagram that the embodiment of the present invention and comparative example provide.
Fig. 6 is the alternating current-direct current fluxgate current sensor relative error curve comparison figure that the embodiment of the present invention and comparative example provide.
Fig. 7 is the frequency response curve of the alternating current-direct current fluxgate current sensor that the embodiment of the present invention provides.
In figure, 1 is toroidal core, and 2 is poly-magnetic magnetic cores, 3 is tested windings, and 4 is excitation windings, and 5 is feedback windings, 6 is secondary side winding, and 7 is fluxgate detection probe, and 8 is measuring resistances, 10 is exiting signal generating circuits, and 101 is square-wave signal generation chips, and 11 is signal drive circuits, 111 is power amplifier chip, and 12 is integral contrast circuit, and 13 is H-bridge drive circuit, 14 is exciting circuits, and 15 is Zero-flux sensing circuit, and 16 is signal processing circuits.
The one-piece construction of alternating current-direct current fluxgate current sensor provided by the invention as shown in Figure 1;
Alternating current-direct current fluxgate sensor provided by the invention, comprises fluxgate detection probe 7 and signal processing circuit 16, and described fluxgate detection probe is made up of a main magnetic core 1, poly-magnetic magnetic core 2, excitation winding 4, feedback winding 5 and secondary side winding 6;
Main magnetic core and poly-magnetic magnetic core are ring type magnetic core, and poly-magnetic magnetic core is enclosed within main magnetic core outside and both are coaxial, is passed through vertically by the winding to be measured 3 of electric current to be measured from main magnetic core central shaft
Excitation winding is the winding that solid conductor is formed along main magnetic core circumferencial direction uniform winding,
Secondary side winding is the winding that solid conductor is formed along the radial uniform winding of poly-magnetic magnetic core,
Feedback winding is that solid conductor edge is to winding toroidal core 1 and poly-magnetic magnetic core 2 are wound in the lump;
Signal processing circuit 16 is made up of exciting circuit 14 and Zero-flux sensing circuit 15;
Exciting circuit comprises exiting signal generating circuit 10 and signal drive circuit 11, has sampling resistor Rs in exiting signal generating circuit, and the output terminal of exiting signal generating circuit 10 is connected to the input end of signal drive circuit 11;
Excitation winding 4 one end is connected with the input end of exiting signal generating circuit and through sampling resistor ground connection, the other end is connected to signal drive circuit 11 output terminal;
Zero-flux sensing circuit 15 comprises integral contrast device circuit 12 and H-bridge drive circuit 13, has measuring resistance Rf in H-bridge drive circuit;
The input end of integral contrast device circuit 12 is connected with the output terminal of signal drive circuit 11, the output terminal of integral contrast device circuit is connected with the input end of H-bridge drive circuit 13, the output terminal of H-bridge drive circuit 13 connects one end of feedback winding 5, the other end of feedback winding 5 is by the measuring resistance Rf ground connection in H-bridge drive circuit 13, the other end of feedback winding 5 is connected to the secondary side winding 6 in fluxgate detection probe 7 simultaneously, the other end ground connection of secondary side winding 6.
Fluxgate detection probe structure as shown in Figure 2.I
e, I
p, I
fand I
sbe respectively excitation winding current, electric current to be measured, feedback winding current and secondary side winding electric current, the number of turn of excitation winding 4, winding to be measured 3, feedback winding 5 and secondary side winding 6 is respectively N
e, N
p, N
fand N
s, feedback winding 5 and excitation winding 4 orthogonal, the magnetic field that two windings are produced effectively to be gathered in main magnetic core and orthogonal, thus reaches the object of the coupling between releasing two magnetic field, and the sensitivity of measuring and the linearity are improved.
As shown in Figure 3, the exiting signal generating circuit in exciting circuit is square-wave signal generation circuit to described exciting circuit, and exciting circuit comprises for the square-wave signal generation chip 101 of square-wave signal generation circuit and the power amplifier chip 111 for signal drive circuit.
The model of described square-wave signal generation chip is LM6132, has 8 pins, respectively output terminals A (OUTA), inverting input A (-INA), in-phase output end A (+INA), the extreme (V of power-
-), power positive end (V
+), output terminal B (OUTB), anti-phase negative input B (-INB) and in-phase input end B (+INB), V
+and V
-be connected with the both positive and negative polarity of direct supply respectively, V
-and V
+the first electric capacity of voltage regulation C of 0.1 μ F is also respectively with capacity
1with the second electric capacity of voltage regulation C
2parallel connection, the first electric capacity of voltage regulation C
1with the second electric capacity of voltage regulation C
2the other end respectively ground connection, again by the first resistance R that resistance is 2.9K after OUTA and-INA short circuit
1be connected with-INB, the input end of+INA parallel connection excitement signal generating circuit and resistance are the sampling resistor R of 20K Ω
sone end, sampling resistor R
sother end ground connection, the input end of exiting signal generating circuit is connected with one end of excitation winding 4; + INB is connected in parallel the second resistance R
2with the 3rd resistance R
3, R
2resistance is 1.8K Ω and other end ground connection, R
3resistance is 13.5K Ω and the output terminal of the other end and OUTB and exiting signal generating circuit is connected in parallel,
Described power amplifier chip model is IR2101s, there are 8 pins, be respectively positive pole feeder ear (Vcc), high level input end (HIN), low level input end (LIN), common port (COM), low level output end (LO), high level unsettled power supply offset voltage (Vs), high level output end (HO), the unsettled supply voltage (V of high level
b), described HIN is connected with the input end of signal drive circuit, and the input end of signal drive circuit is connected with the output terminal of exiting signal generating circuit; Vcc connects DC power anode, and DC power anode is also the diode D of 1N4106 by a model
1with V
bconnect, V
bbe the 3rd electric capacity of voltage regulation C of 0.1 μ F again by a capacitance
3with V
sconnect; LIN is unsettled, and the output terminal of HO connection signal driving circuit is also connected by the other end of output terminal with excitation winding, and COM is connected with the negative pole of direct supply, LO ground connection.
Described integral contrast device circuit as shown in Figure 4, comprising model is TLC2652 integral contrast device chip 121, described integral contrast device chip comprises 8 pins, be respectively homophase input (IN+), anti-phase input (IN-), positive pole feeder ear (VDD+), negative pole feeder ear (VDD-), output terminal (OUT), clamper end (CLAMP), filter capacitor incoming end A (C
xA) and filter capacitor incoming end B (C
xB),
C
xAthrough the 5th electric capacity of voltage regulation C of series connection
5(0.1 μ F) and the 6th electric capacity of voltage regulation C
6(capacitance is 0.01 μ F) ground connection afterwards, at C
5and C
6between connect electric capacity the 7th electric capacity of voltage regulation C
7(capacitance is 0.01 μ F), C
7the other end connect C
xB, IN-and the 4th resistance R
4(resistance is 10K Ω) and the 4th electric capacity of voltage regulation C
4(capacitance is 0.01 μ F) is connected, R
4the output terminal of connection signal driving circuit, the 4th electric capacity of voltage regulation C
4the other end be connected in parallel OUT and measuring resistance R
f(resistance is 200 Ω), R
fthe other end be connected with the input end of H-bridge drive circuit, IN+ is through the 5th resistance R
5(resistance is 10.2K Ω) ground connection, VDD-connects DC power cathode, and CLAMP is unsettled, the DC power anode that VDD+ connects.
Embodiment
Main magnetic core formal parameter is: internal diameter d
1=9mm, outer diameter D
1=18mm and height H
1=10mm.
Poly-magnetic magnetic core formal parameter is: internal diameter d
2=20mm, outer diameter D
2=30mm and height H
2=10mm.Main magnetic core and poly-magnetic magnetic core coaxially contour
Umber of turn N to be measured
p=1, be the solid conductor passed along main magnetic core central axis;
Excitation umber of turn N
e=50 (40 ~ 50); Secondary side winding number of turn N
s=200 (150 ~ 200); Feedback umber of turn N
f=150 (100 ~ 150).
In the present embodiment, the material of main magnetic core and poly-magnetic magnetic core is Fe-Base nanocrystalline soft magnetic material, and its saturation magnetic flux density is B
s=1.2T, coercive force H
c<5A/m, saturation magnetostriction constant is S=10
-8~ 10
-6, magnetic permeability is 15000 ~ 150000H/m, core loss (100KHz, 0.3T) P
fe=80W/Kg.
Above-mentioned fluxgate current sensor, described whole winding all adopts diameter to be the enameled wire of 0.3mm.Direct supply is adopted to be 15V direct supply.The driving voltage signal at excitation winding two ends is the square-wave signal of frequency f=10kHz, amplitude ± 15V
Comparative example
Main magnetic core for after excitation winding twines, then winds up along magnetic core circumferencial direction with a wire by the feedback winding in comparative example, feeds back the number of turn N ' of winding in comparative example
f=n
f, make excitation winding and the distribution of feedback winding parallel, other same embodiments.
The embodiment of the present invention and comparative example are in measured current I
pwhen scope is from 0A to 25A, input-output characteristic curve contrast as shown in Figure 5.The voltage at output voltage and measuring resistance two ends in figure, as can be seen from Fig., the sensitivity of fluxgate current sensor that the comparative example of excitation winding and the distribution of feedback winding parallel provides is lower, and accuracy and the linearity poor; And adopt the embodiment fluxgate current sensor of excitation winding and feedback winding omnidirectional distribution, because feedback winding and excitation winding form omnidirectional distribution, the magnetic field that two windings are produced effectively to be gathered in main magnetic core and orthogonal, thus reach the object of the coupling between releasing two magnetic field, the sensitivity of measurement and the linearity are improved greatly.
Actual value is deducted by the theoretical value of output voltage, more just can relative error divided by actual value, measured current I
pwhen scope is from 0A to 25A, the graph of errors comparison diagram of embodiment and comparative example as shown in Figure 6.Can find out in figure, the relative error of the embodiment of the present invention is ± 0.4%, and the relative error of comparative example then exceedes ± 0.12%.
The frequency response curve of the embodiment of the present invention as shown in Figure 7.Can find out in figure adopt institute provided by the invention inventive embodiments to provide the signal attenuation of fluxgate current sensor when power frequency to be measured is less than 40KHz be less than 5dB, go for frequency not higher than the current detecting of 40KHz, this frequency is substantially consistent with adopting the frequency of operation of magnetic core.
The starting material used in above-described embodiment and parts all obtain by being purchased approach, all circuit diagrams are also existing known technologies, the poly-magnetic magnetic core of band and the assemble method of the fluxgate current sensor of winding omnidirectional distribution, measuring method and process be the art hold wield.
Claims (7)
1. alternating current-direct current fluxgate current sensor, comprises fluxgate detection probe and signal processing circuit, it is characterized in that described fluxgate detection probe is made up of a main magnetic core, poly-magnetic magnetic core, excitation winding, feedback winding and secondary side winding;
Main magnetic core and poly-magnetic magnetic core are ring type magnetic core, poly-magnetic magnetic core is enclosed within main magnetic core outside and both are coaxial, excitation winding is the winding that solid conductor is formed along main magnetic core circumferencial direction uniform winding, secondary side winding is the winding that the solid conductor edge radial uniform winding of poly-magnetic magnetic core is formed, and feedback winding is that solid conductor edge is to winding toroidal core and poly-magnetic magnetic core are wound in the lump;
Signal processing circuit is made up of exciting circuit and Zero-flux sensing circuit, exciting circuit comprises exiting signal generating circuit and signal drive circuit, have sampling resistor in exiting signal generating circuit, the output terminal of exiting signal generating circuit is connected to the input end of signal drive circuit; Excitation winding one end is connected with the input end of exiting signal generating circuit and through sampling resistor ground connection, the other end is connected to signal drive circuit output terminal; Zero-flux sensing circuit comprises integral contrast device circuit and H-bridge drive circuit, has measuring resistance in H-bridge drive circuit; The input end of integral contrast device circuit is connected with the output terminal of signal drive circuit, the output terminal of integral contrast device circuit is connected with the input end of H-bridge drive circuit, the output terminal of H-bridge drive circuit connects one end of feedback winding, the other end of feedback winding is by the measuring resistance ground connection in H-bridge drive circuit, the other end simultaneously feeding back winding is connected to the secondary side winding in fluxgate detection probe, the other end ground connection of secondary side winding.
2. alternating current-direct current fluxgate current sensor as claimed in claim 1, is characterized in that the height H of main magnetic core
1with the height H of poly-magnetic magnetic core
2equal.The internal diameter d of poly-magnetic magnetic core
2be greater than the outer diameter D of main magnetic core
1, d
2-D1≤2mm.
3. alternating current-direct current fluxgate current sensor as claimed in claim 1, is characterized in that described exiting signal generating circuit is selected from the one in square-wave signal generation circuit, triangular signal circuit for generating, sine wave signal circuit for generating.
4. alternating current-direct current fluxgate current sensor as claimed in claim 1, the exiting signal generating circuit described in its feature is square-wave signal generation circuit.
5. the square-wave signal generation circuit employing model of described alternating current-direct current fluxgate current sensor as claimed in claim 4 is the square-wave signal generation chip of LM6132.
6. the alternating current-direct current fluxgate current sensor as described in as arbitrary in Claims 1 to 5, is characterized in that described signal drive circuit adopts model to be the power amplifier chip of IR2101s.
7. the alternating current-direct current fluxgate current sensor as described in as arbitrary in Claims 1 to 5, is characterized in that described integral contrast device circuit adopts model to be TLC2652 integral contrast device chip.
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|---|---|---|---|
| CN201610135620.5A CN105572456A (en) | 2016-03-10 | 2016-03-10 | AC/DC fluxgate current sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610135620.5A CN105572456A (en) | 2016-03-10 | 2016-03-10 | AC/DC fluxgate current sensor |
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Family
ID=55882817
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| CN201610135620.5A Pending CN105572456A (en) | 2016-03-10 | 2016-03-10 | AC/DC fluxgate current sensor |
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| CN106405189A (en) * | 2016-08-14 | 2017-02-15 | 河北工业大学 | Current sensor with temperature stability and measuring method thereof |
| CN106526283A (en) * | 2016-11-03 | 2017-03-22 | 清华大学 | Multi-range current sensing device based on giant magnetoresistance effect |
| CN108169538A (en) * | 2018-03-19 | 2018-06-15 | 深圳市航智精密电子有限公司 | More closed control circuits of fluxgate current sensor |
| CN110412327A (en) * | 2019-06-19 | 2019-11-05 | 中国人民解放军海军工程大学 | A kind of digital direct current current sensor |
| CN110412334A (en) * | 2019-06-19 | 2019-11-05 | 中国人民解放军海军工程大学 | A kind of digital Zero flux leakage current sensor |
| CN110687339A (en) * | 2018-07-05 | 2020-01-14 | 横河电机株式会社 | Current sensor |
| CN110988430A (en) * | 2019-10-31 | 2020-04-10 | 上海科技大学 | Fluxgate heavy current sensor based on digital second harmonic detection and ripple compensation |
| CN111665383A (en) * | 2020-05-22 | 2020-09-15 | 哈尔滨工业大学 | Full-digital fluxgate type current sensor |
| CN112384812A (en) * | 2018-06-27 | 2021-02-19 | 赛峰电子与防务公司 | Current sensor with fluxgate |
| CN113049868A (en) * | 2021-03-10 | 2021-06-29 | 优利德科技(中国)股份有限公司 | Alternating current and direct current measuring device and measuring method |
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| CN113341211A (en) * | 2021-05-18 | 2021-09-03 | 西安交通大学 | Fluxgate current sensor and measuring method thereof |
| CN116735939A (en) * | 2023-06-14 | 2023-09-12 | 上海盛位电子技术有限公司 | Fluxgate current detection device and fluxgate current detection method |
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| CN108169538A (en) * | 2018-03-19 | 2018-06-15 | 深圳市航智精密电子有限公司 | More closed control circuits of fluxgate current sensor |
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| CN110687339B (en) * | 2018-07-05 | 2021-07-30 | 横河电机株式会社 | Current sensor |
| CN110687339A (en) * | 2018-07-05 | 2020-01-14 | 横河电机株式会社 | Current sensor |
| CN110412327A (en) * | 2019-06-19 | 2019-11-05 | 中国人民解放军海军工程大学 | A kind of digital direct current current sensor |
| CN110412334A (en) * | 2019-06-19 | 2019-11-05 | 中国人民解放军海军工程大学 | A kind of digital Zero flux leakage current sensor |
| CN110412327B (en) * | 2019-06-19 | 2022-02-18 | 中国人民解放军海军工程大学 | Digital direct current sensor |
| CN110412334B (en) * | 2019-06-19 | 2022-02-18 | 中国人民解放军海军工程大学 | Digital zero-flux leakage current sensor |
| CN110988430A (en) * | 2019-10-31 | 2020-04-10 | 上海科技大学 | Fluxgate heavy current sensor based on digital second harmonic detection and ripple compensation |
| CN110988430B (en) * | 2019-10-31 | 2022-08-02 | 上海科技大学 | Fluxgate heavy current sensor based on digital second harmonic detection and ripple compensation |
| CN111665383A (en) * | 2020-05-22 | 2020-09-15 | 哈尔滨工业大学 | Full-digital fluxgate type current sensor |
| CN111665383B (en) * | 2020-05-22 | 2022-06-21 | 哈尔滨工业大学 | Full-digital fluxgate type current sensor |
| CN113049868A (en) * | 2021-03-10 | 2021-06-29 | 优利德科技(中国)股份有限公司 | Alternating current and direct current measuring device and measuring method |
| CN113325265A (en) * | 2021-05-12 | 2021-08-31 | 武汉三相电力科技有限公司 | Device for detecting mixed traveling wave in power transmission line |
| CN113341211A (en) * | 2021-05-18 | 2021-09-03 | 西安交通大学 | Fluxgate current sensor and measuring method thereof |
| CN113341211B (en) * | 2021-05-18 | 2024-05-24 | 西安交通大学 | Fluxgate current sensor and measuring method thereof |
| CN116735939A (en) * | 2023-06-14 | 2023-09-12 | 上海盛位电子技术有限公司 | Fluxgate current detection device and fluxgate current detection method |
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Application publication date: 20160511 |