CN1570655A - Double detection type current sensor - Google Patents
Double detection type current sensor Download PDFInfo
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- CN1570655A CN1570655A CN 200410013110 CN200410013110A CN1570655A CN 1570655 A CN1570655 A CN 1570655A CN 200410013110 CN200410013110 CN 200410013110 CN 200410013110 A CN200410013110 A CN 200410013110A CN 1570655 A CN1570655 A CN 1570655A
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Abstract
This invention discloses a double-detecting current sensors, wherein there evenly and symmetrically located gas gaps in the circular iron core and feedback windings in two paralleling channels are cascaded one end of which is put to earth and the other is connected with one end of corresponding sample resistance; the output of two Hall components located symmetrically are to filter wave, to translate voltage and current and to enlarge current after kinematical gaining. And their outputs are connected with the other end of sample resistance. The voltage signals of both ends of said resistance are delivered into computer. And the both ends of cascaded Rogowski coil are connected with sample resistance and it signals can split wave, enlarge volume after kinematical gaining and its voltage signals are delivered to computer and displayed on the screen. The invention can overcome the shortcomings caused by iron core saturation and is of high accuracy and high anti-interference of magnetism and of simple structure.
Description
Technical field
The present invention relates to a kind of current sensor, be suitable for detecting the direct current and the alternating current that comprise following aspect: be used for current feedback in the power electronic equipment, the control of damming, current stabilization regulate and the transient current signal of DC side overcurrent and short-circuit protection detects.
Background technology
At DC transmission system, RHVC, ups power, inverter type welder, metallide, numerically-controlled machine, microcomputer detecting system, grid monitoring system with need in the every field of isolation detection non-sinusoidal current, accurately detecting and the control non-sinusoidal current, is the basic assurance of device security reliability service and the problem that at first will solve.
The Rogowski coil, its magnetic circuit does not contain iron core, is a kind of air core coil of special construction, also claims hollow mutual inductor.Because its magnetic circuit does not contain iron core, no saturation problem, transient performance is good, bandwidth, be subjected to the position influence of the influence of external magnetic field and tested current little, do not have the stability problem of power and heating power, have good electromagnetic shielding characteristic, with high tension loop good insulation performance is arranged, simple in structure, be easy to advantages such as processing, cooperate outside integrating circuit, can measure the transient current such as the pulse current that cause core sataration because of the too big or too high di/dt of amplitude exactly, conducting lightning currents.At present extensively with it as in air insulation switch and the relay protection, a kind of simple and the transient current that effectively measurement is very big or the sensor of high di/dt electric current.But because the magnetic circuit of Rogowski coil does not contain iron core, for tested electric current too little (for example≤100A) or di/dt when little because coefficient of mutual inductance is too little, the voltage signal that induction obtains from the Rogowski coil too a little less than, measuring error is bigger.Therefore, must take measures to improve the coefficient of mutual inductance of Rogowski coil.
Worked out now such as current measure devices such as current comparator, current transformer, shunts; Some measuring equipments based on physical influences such as magneto-optic effect and nuclear magnetic resonance have also appearred.
Use the greatest problem of shunt not import and export not isolation exactly, and, when measuring high frequency or heavy current, have inductive inevitably with shunt.Therefore, behind the access shunt, both tested current waveform can be influenced, nonsinusoidal signal can not be truly transmitted again.
For present a large amount of transformer type current transformers that adopt, have dielectric strength height, reliable operation, advantage such as cheap.But when transient current or di/dt were too big, saturated phenomenon appearred in magnetic circuit easily, and secondary side's electric current can not reflect tested electric current undistortedly; The frequency range that it can adapt to is very narrow, especially can not transmit direct current; And, because the imperfection of mutual inductor makes no-load voltage ratio and phase place all have bigger error, need to adopt the method compensation of hardware or software, thereby increased the complexity of system; In addition, there is exciting curent during operation of current transformers,, when measuring high frequency or heavy current, has ground the same shortcoming with shunt so it is an inductive element.Developed the current transformer of band air gap afterwards on this basis, this mutual inductor is owing to opened one section air gap on magnetic circuit, its magnetic resistance increases, remanent magnetism reduces, the equivalence magnetization curve has been realized linearization, makes magnetic circuit also be unlikely to saturated when transient current or di/dt are very big, so pair can reach and reacts transient current substantially undistortedly, but its physical dimension is huger.
For containing iron core formula current comparator, stable performance, power consumption less (comparing with shunt) can be born bigger load, can not disconnect circuit-under-test during installation.But owing to use core material, be not to have desirable magnetization characteristic, easily saturated, the size of tested electric current is limited to some extent, and its shielding construction complexity, physical dimension is bigger, is generally used for the laboratory caliberating device of electric current.
Except above-mentioned current sensor, the magnetic balance type Hall current sensor has also appearred, it is based on the commercial power flow sensor of new generation of the measurement Control current that Hall effect grows up, its essence is an electric current-magnetic-voltage changer, its effect is identical with traditional current transformer, have good electricity between its input and output and isolate, dielectric voltage withstand surpasses 3kV.It is to utilize Hall element to measure the magnetic induction density of tested electric current in iron core (around tested current) air gap to judge tested size of current.Its feature is: simple in structure, can not disconnect circuit-under-test during installation; And have that precision height, good linearity, bandwidth, response are fast, overload capacity is lost plurality of advantages such as circuit-under-test energy by force and not.But the input resistance of Hall element and the numerical value of output resistance are not invariable, so there is magnetoresistance in it, and it is ever-increasing with magnetic induction density.Except Hall voltage, in output voltage, also there are other several rest potentials at single Hall element.The Hall coefficient of Hall element, input resistance, output resistance and rest potential are all relevant with temperature, so Hall element exists bigger temperature error.Therefore, must take measures to overcome the Hall voltage, Hall element of Hall element to the relatively influence of unfavorable factor such as sensitivity and temperature error of tested electric current current position.
Along with the widespread use of Power Electronic Technique in fields such as DC transmission system, RHVC, inverter, ups power, inverter type welder, transformer station, metallide, numerically-controlled machine, microcomputer detecting system, grid monitoring system, just seem particularly important with detecting for the transmission of wide spectrum (comprising DC component), small magnitude, high di/dt non-sinusoidal current waveform.For amplitude is not too big transient current, if seal in the electric parameter that shunt will certainly change the loop in the power electronics loop, will exert an influence to tested current loop; If adopt conventional sensors parts such as comparator, current transformer, Rogowski coil and Hall element separately, can not satisfy the detection requirement of above-mentioned special waveform electric current.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art part, a kind of double check formula current sensor is provided.This sensor is made of the Rogowski coil of Hall element and coupled in series, it obviously improves saturation characteristic, the linearity and the antijamming capability of sensor, responsive to little electric current, can accurately measure di/dt is not too big transient current, can certainly measure the quite high transient current of big electric current or di/dt.
For achieving the above object, the technical solution used in the present invention is: a kind of double check formula current sensor, comprise annular core, Hall element, even on above-mentioned annular core, symmetry has air-gap, feedback winding in the symmetrical channels is in series, end ground connection after the series connection, an end of the corresponding sampling resistor of another termination; In the above-mentioned air-gap, two Hall elements that symmetry is placed are one group, each Hall element is controlled by constant current source, two Hall component output are joined with the positive and negative input end of operational amplifier respectively in every group, after amplifying, operational amplifier carries out filtering, voltage-to-current conversion, current amplifying process, its output terminal connects the other end of above-mentioned sampling resistor, and the detectable voltage signals at these sampling resistor two ends is delivered to computing machine; It also comprises the Rogowski coil of coupled in series, two outlet termination sampling resistors at coil, the two ends of this sampling resistor connect the positive and negative input end of operational amplifier respectively, positive input terminal ground connection, the detectable voltage signals of sampling resistor is after this operational amplifier amplifies, carry out filtering, integration processing and amplifying again, deliver to computing machine; By the above-mentioned data of respectively organizing of Computer Processing, after the processing tested size of current is delivered to display and show.
Outside the insulation course and protective seam of the Rogowski coil of above-mentioned feedback winding and coupled in series; ground plane is set specially to replace above-mentioned ground wire, sets gradually insulation course and protective seam, electro-magnetic screen layer, outermost insulation course and protective seam in this ground plane outside.
The invention has the advantages that:
(1) because of the Hall element symmetry be placed in the air-gap, when entering Hall element from equidirectional disturbing magnetic field, magnetic flux density can produce opposite Hall interference potential on the Hall element of two symmetrical distributions, and in circuit, offset voluntarily, effectively improved the interference free performance of sensor.
(2) because of the Hall element symmetry be placed in the air-gap, effectively overcome the Hall element shortcoming relatively more responsive to tested electrical current carriers position.
(3) because of the Hall element symmetry be placed in the air-gap, can effectively suppress the temperature error of Hall element.
(4) this sensor utilizes the no inductance and the fast response characteristic of Hall element, measure the electric current (promptly satisfy and can require) of the not too big or not too high di/dt of amplitude in the power electronics circuit because of the too big or too high di/dt of amplitude cause the magnetically saturated current detecting of iron core, can avoid changing original di/dt value because of the access of sensor, therefore, the detection that it is particularly suitable for being used for current feedback in the power electronic equipment, joint and DC side excess current are withered in the control of damming, current stabilization.
(5) utilize the Rogowski coil of coupled in series, can improve its susceptibility effectively tested little electric current.
(6) this sensor utilization Rogowski coil of not containing the coupled in series of iron core does not have saturation problem, bandwidth, fast response characteristic.Because the distributed capacitance of the Rogowski coil after the coupled in series is along with the quantity increase of series coil is approximated to linear the minimizing, series inductance is along with the quantity of coil increases and linear increasing, theoretical proof, do like this, Frequency Response influence to the Rogowski coil is little, but can obviously improve the coefficient of mutual inductance of Rogowski coil.
(7) the Rogowski coil that obtains according to the coupled in series mode not only can measure in the power electronics circuit because of amplitude be not too big or di/dt is not that too high non-sinusoidal transient current detects, can also finish in the loop and cause the iron core magnetic saturation because of surveying the too big or too high di/dt of current amplitude, current detecting task when causing the Hall element cisco unity malfunction, promptly can overcome the deficiency of core sataration, also can not produce harmful effect, can not make the whole sensor paralysis the power electronics loop.
(8) this sensor adopts the Rogowski coil of the coupled in series that does not contain iron core, can measure the quite high transient current of big electric current or di/dt, only needs to reduce the number of series connection Rogowski coil.
(9) this sensor adopts the constant-current source circuit of the voltage-to-current conversion with stronger carrying load ability, in order to make outputting current steadily, except that each link is introduced degree of depth negative feedback, also take a sample through the voltage follower feedback adder from output current, form a big external feedback, further strengthened the degree of stability of output current, make constant current source load variations in a big way in output current have high stability.
In a word, the saturation characteristic and the linearity of sensor have obviously been improved; Precision is better than 0.5%, and power consumption is little, Additional temperature error＜0.1%/10 ℃, and diamagnetic interference performance is strong; Simple in structure, in light weight, price is low, installs, calibrates, debugs, safeguards all very convenient.
Description of drawings
Fig. 1 is the structural representation of an embodiment of the present invention.
Fig. 2 is the position view of three skeleton cores among Fig. 1.
Fig. 3 is the Hall element H of symmetric arrangement among Fig. 1
1, H
2With series connection Rogowski coil circuit figure.
Fig. 4 (a) is Hall element H among Fig. 1
1Constant-current source circuit figure.
Fig. 4 (b) is Hall element H among Fig. 1
2Constant-current source circuit figure.
Fig. 5 is round section skeleton core F among Fig. 1
1Structural representation.
Embodiment
By shown in Figure 1,1 is display, and 2 for handling the computing machine from two groups of parallel port detectable voltage signals; 3 are filtering, voltage-to-current conversion, the current amplification circuit of processing from the Hall voltage of two hall detection components of symmetric arrangement; 4 are filtering, the integrating amplification circuit of processing from the induced voltage of the Rogowski coil of coupled in series; 5 is tested current bus bar; 6 is special-purpose ground plane; F
1, F
2And F
3Be three skeleton cores; A
1And A
2Be operational amplifier; R
S1And R
S2It is the sampling resistor of two groups of sense channels; I
F1And I
F2It is the electric current that flows through in two groups of sense channels; U
S1Be sampling resistor R
S1Terminal voltage; U
S2Output voltage for circuit 4; U
R1And U
R2Be sampling resistor R
S2Terminal voltage, H
1And H
2Be two Hall elements; U
H1And U
H2Be two Hall voltages that Hall element is exported; W
1And W
2Two feedback windings for passage; W
31And W
32Be respectively the number of turn of two coupled in series coil Rog1 and Rog2.
Skeleton core F
1Be annular core, at iron core F
1Diametric(al) offer two air-gaps, air gap evenly, be symmetrically distributed, the core length of each passage equates, Hall element H
1And H
2Place air gap respectively.At iron core F
1Outer insulating material on, evenly close around the feedback winding, during coiling feedback winding, must be noted that coil winding-direction, guarantee that sensor realizes that zero magnetic flux detects principle.Two feedback winding W
1And W
2Be in series series connection back one termination sampling resistor R
S1An end, other end ground connection.The Hall element H of symmetric arrangement
1And H
2By constant current source control, two Hall element H
2, H
1Output terminal respectively with operational amplifier A
1Positive and negative input end join, deliver to circuit 3 after the amplification and carry out filtering, voltage-to-current conversion, current amplifying process, the output termination sampling resistor R of circuit 3
S1The other end, sampling resistor R
S1The voltage at two ends is delivered to computing machine 2.
In the present invention, evenly, the air gap number that is symmetrically distributed is a plurality of, general air gap number is chosen as more than or equal to 2 and is no more than 10 even number.Because opening the more, the total length of air-gap is bigger, and iron core just more can be more unsaturated, but considers how opening can make the accuracy of sensor descend, and also can increase manufacturing cost on the other hand, and the physical strength of iron core is descended.So, iron core F
1Open amount should be the least possible.Because opening is big more, iron core F
1Be difficult for saturated more.But after opening was big, the magnetic field in the air-gap can disperse, like this iron core F
1Just lost the effect of magnetism gathering rings, and iron core F
1Opening too conference is unfavorable for the accuracy of sensor.Therefore, gas length can be less than iron core F
1Subduplicate 10～15 times of sectional area is taken into account tested size of current and core dimensions size requirements, otherwise can be influenced the sensor measurement precision.In order to strengthen the sensor sensing signal,, can increase iron core F as far as possible not changing under other size prerequisite of sensor
1Axial width, then gas length also can correspondingly increase.
Skeleton core F
2And F
3Be nonferromagnetic material, at F
2And F
3Outer insulating material on evenly close around the Rogowski coil, again by skeleton core F
2And F
3The line that unrolls is drawn at the center.The structural parameters of two coupled in series coil Rog1 and Rog2 can be the same, can be different.Two outlet termination sampling resistor R at coil Rog1 and Rog2
S2, sampling resistor R
S2Two ends connect operational amplifier A respectively
2Positive and negative input end, positive input terminal ground connection, operational amplifier A
2Output deliver to computing machine 2 by filtering, integrating amplification circuit 4.
Select operational amplifier A
2Should consider its Slew Rate, ascending velocity, drift and precision, generally select the low drift of higher speed precision operational-amplifier, for example, OP27.Circuit 4 is common filtering, integrating amplification circuit.When selecting Rogowski coil coupled in series number, should consider tested current amplitude or di/dt size, promptly the voltage signal that induction obtains from the Rogowski coil is not wanted too weak (otherwise measuring error is bigger), consider the dynamic perfromance of coupled in series Rogowski coil again, also will consider the physical dimension of whole sensor.
Handle above-mentioned two groups of different data by computing machine 2, after the processing tested size of current is delivered to display 1 and show.
If skeleton core F
1The air gap number be ten, the Rogowski coil of coupled in series is six, at this moment two of symmetric arrangement Hall elements are as one group, then have five groups, being input to just has five groups of data in the computing machine 2, add from one group of six coupled in series Rogowski coil outputs, computing machine 2 will be handled six groups of different data, after the processing size of tested electric current be delivered to display 1 and show.
By shown in Figure 2, for easy for installation, three skeleton core F
1, F
2And F
3Should choose same size, 13 is skeleton core F
2Loop line groove (certain skeleton core F
3The loop line groove also arranged).For the position relation of three skeleton cores is described, Fig. 2 has exaggerated the spacing distance d between them
1And d
2, work as F
1, F
2And F
3After twining insulation course and protective seam, ground plane, ground plane insulation course and protective seam, electro-magnetic screen layer and outermost insulation course and protective seam separately, they can be fixed together forms an integral body.
By shown in Figure 3, I
+And I
-Be positive-negative power, power supply stream is given the Hall element H of two symmetry placements respectively
1And H
2R
F1And R
F2Expression constant current source I
+And I
-Feedback resistance; a
1, c
1Terminal is represented Hall element H
1DC control electric current input, output terminal, b
1, d
1Terminal is represented Hall element H
1The Hall voltage output terminal, a
2, c
2Terminal is represented Hall element H
2DC control electric current input, output terminal, b
2, d
2Terminal is represented Hall element H
2The Hall voltage output terminal; Operational amplifier A
1Can select for use as the INA128 instrument and constitute instrument operation amplifier circuit structure with operational amplifier or by precision operational-amplifiers such as OP07, OP27; R
KThe expression operational amplifier A
1The enlargement factor controlling resistance, can select precision resister for use; Circuit 3 is common filtering, voltage-to-current conversion, current amplification circuit; * number four winding W of expression
1, W
2, W
31, and W
32End of the same name.
Hall element H
1A
1End (is supplied with H with constant current source
1Electric current be I
+) feedback resistance R
F1Join other end c
1Ground connection, Hall element H
2C
2End (is supplied with H with constant current source
2Electric current be I
-) feedback resistance R
F2Join other end a
2Ground connection, Hall element H
1B
1End and Hall element H
2D
2End joins, Hall element H
1D
1End, Hall element H
2B
2The end respectively with operational amplifier A
1Negative input end, positive input terminal join.Because with Hall element H
1, H
2B
1With d
2Join c
1With a
2Join and ground connection, when entering Hall element from equidirectional disturbing magnetic field, magnetic field can be at the Hall element H of two symmetrical distributions
1, H
2Produce opposite Hall interference potential above, and in circuit, offset voluntarily.As Hall element H
1, H
2DC control current input terminal a
1, c
1And a
2, c
2Flow through DC current from constant current source, when its vertical surface has magnetic field and has the magnetic line of force to pass, its Hall voltage output terminal b
1, d
1And b
2, d
2Terminal just produces Hall voltage, operational amplifier A
1It is poor to amplify Hall voltage, i.e. U
H=U
H1-U
H2, its enlargement factor is by controlling resistance R
KControl, enlargement factor is approximately 1+50k Ω/R
K, send into circuit 3 again and handle.
Shown in Fig. 4 (a), Hall element H
1The concrete connection of constant-current source circuit be operational amplifier A
3Positive input terminal pass through resistance R
2Receive reference source U
Ref1, and positive input terminal passes through resistance R
3Ground connection, operational amplifier A
3Negative input end pass through resistance R
4Receive its output terminal, and negative input end passes through resistance R
1Receive operational amplifier A
5Output terminal, operational amplifier A
3Output terminal pass through resistance R
5Receive operational amplifier A
4Negative input end.Operational amplifier A
4Negative input end pass through resistance R
6Receive power amplifier tube T
2Emitter, positive input terminal passes through resistance R
7Receive power amplifier tube T
1Emitter, and ground connection, output terminal passes through resistance R
8Receive power amplifier tube T
1Base stage.Power amplifier tube T
1Collector meet power amplifier tube T
2Base stage, and pass through resistance R
9Meet power amplifier tube T
2Collector and+the 15V power supply.Operational amplifier A
5Output terminal pass through resistance R
10Receive its negative input end, its positive input terminal passes through resistance R
F1Receive power amplifier tube T
2Emitter.Hall element H
1DC control current input terminal a
1With operational amplifier A
5Positive input terminal join DC control current output terminal c
1Ground connection.
The principle of work of Fig. 4 (a) is summarized as follows: reference source U
Ref1Through totalizer A
3, feedback amplifier A
4, by current-amplifying driving circuit (T
1, T
2) output high stable electric current.Because operational amplifier A
5Constitute follow circuit, its input impedance very high (〉=10
12Ω), then flow through feedback resistance R
F1Electric current all flow to Hall element H
1In order to make outputting current steadily, except that each link is introduced degree of depth negative feedback, also take a sample through voltage follower A from output current
5Feed back to operational amplifier A
3, form a big feedback, further strengthened the degree of stability of output current, make constant current source load variations in a big way in output current have high stability.
Shown in Fig. 4 (b), Hall element H
2The concrete connection of constant-current source circuit be operational amplifier A
6Positive input terminal pass through resistance R
12Receive reference source U
Ref2, and positive input terminal passes through resistance R
13Ground connection, operational amplifier A
6Negative input end pass through resistance R
14Receive its output terminal, and negative input end passes through resistance R
11Receive operational amplifier A
8Output terminal, operational amplifier A
6Output terminal pass through resistance R
15Receive operational amplifier A
7Negative input end.Operational amplifier A
7Negative input end pass through resistance R
16Receive power amplifier tube T
4Emitter, positive input terminal passes through resistance R
17Receive power amplifier tube T
3Emitter, and ground connection, output terminal passes through resistance R
18Receive power amplifier tube T
3Base stage.Power amplifier tube T
3Emitter meet power amplifier tube T
4Base stage, its collector passes through resistance R
19Meet power amplifier tube T
4Collector and-the 15V power supply.Operational amplifier A
8Output terminal pass through resistance R
20Receive its negative input end, its positive input terminal is by feedback resistance R
F2Receive power amplifier tube T
4Emitter.Hall element H
2DC control current output terminal c
2With operational amplifier A
8Positive input terminal join DC control current input terminal a
2Ground connection.
The principle of work of Fig. 4 (b) is summarized as follows: reference source U
Ref2Through totalizer A
6, feedback amplifier A
7, by current-amplifying driving circuit (T
3, T
4) output high stable electric current.Because operational amplifier A
8Constitute follow circuit, its input impedance very high (〉=10
12Ω), then flow through feedback resistance R
F2The electric current Hall element H that all flows through
2In order to make outputting current steadily, except that each link is introduced degree of depth negative feedback, also take a sample through voltage follower A from output current
8Feed back to operational amplifier A
6, form a big feedback, further strengthened the degree of stability of output current, make constant current source load variations in a big way in output current have high stability.
The above-mentioned constant current source of saying, its components and parts system of selection can be R
1～R
7, R
11～R
17Select high-accuracy resistance for use; R
8, R
9, R
18, R
19Select carbon resistance film for use; Feedback resistance R
F1And R
F2Select high-accuracy resistance for use, and its resistance is near the input resistance value R of Hall element
Hi(i=1,2) satisfy R
F+ R
Hi＜＜R
1Reference source U
Ref1And U
Ref2The REF02P chip that can select for use PMI company to produce produces and obtains, and this chip is+5V standard of precision voltage/temperature sensor; A
3～A
8All adopt high precision, low drift, dynamic school zero CMOS type chopper-zero-stabilized formula ICL7650 (or CF7650) integrated operational amplifier.
By shown in Figure 5, skeleton core F
1Be processed into the annular shape of round section, certainly, also can be processed into the annular shape of square-section, skeleton core F
1Can choose siliconized plate or permalloy lamination forms.At skeleton core F
1Insulation course and protective seam 7 outside even close feedback winding 8 around the multi-turn curl; again at winding 8 outside coiling insulation courses and protective seam 9; outside it; the ground plane 6 of sensor is set specially again; set gradually insulation course and protective seam 10, electro-magnetic screen layer 11, outermost insulation course and protective seam 12 in these ground plane 6 outsides.This version has improved the anti-electromagnetic interference capability of sensor.
Skeleton core F
2And F
3Be processed into the annular shape of square-section, certainly, also can be processed into the annular shape of round section, skeleton core F
2And F
3Can choose soft rubber belt or epoxy resin rod.The Rogowski coil circle that unrolls when coiling is drawn from skeleton core loop line groove center.At two skeleton core F
2And F
3Insulation course and protective seam outside close around the Rogowski coil; at coil outside coiling insulation course and protective seam, outside it, the ground plane of sensor is set specially more again; set gradually insulation course and protective seam, electro-magnetic screen layer in this ground plane outside, outermost insulation course and protective seam.
Claims (3)
1. a double check formula current sensor comprises annular core, Hall element, it is characterized in that:
Even on above-mentioned annular core, symmetry has air-gap, and the feedback winding in the symmetrical channels is in series, the end ground connection after the series connection, an end of the corresponding sampling resistor of another termination;
In the above-mentioned air-gap, two Hall elements that symmetry is placed are one group, each Hall element is controlled by constant current source, two Hall component output are joined with the positive and negative input end of operational amplifier respectively in every group, after amplifying, operational amplifier carries out filtering, voltage-to-current conversion, current amplifying process, its output terminal connects the other end of above-mentioned sampling resistor, and the detectable voltage signals at these sampling resistor two ends is delivered to computing machine;
It also comprises the Rogowski coil of coupled in series, two outlet termination sampling resistors at coil, the two ends of this sampling resistor connect the positive and negative input end of operational amplifier respectively, positive input terminal ground connection, the detectable voltage signals of sampling resistor is after this operational amplifier amplifies, carry out filtering, integration processing and amplifying again, deliver to computing machine;
By the above-mentioned data of respectively organizing of Computer Processing, after the processing tested size of current is delivered to display and show.
2. current sensor according to claim 1 is characterized in that: receive in above-mentioned every group, the constant-current source circuit of a Hall element is operational amplifier A
3Positive input terminal pass through resistance R
2Receive reference source U
Ref1, and positive input terminal passes through resistance R
3Ground connection, operational amplifier A
3Negative input end pass through resistance R
4Receive its output terminal, and negative input end passes through resistance R
1Receive operational amplifier A
5Output terminal, operational amplifier A
3Output terminal pass through resistance R
5Receive operational amplifier A
4Negative input end, operational amplifier A
4Negative input end pass through resistance R
6Receive power amplifier tube T
2Emitter, positive input terminal passes through resistance R
7Receive power amplifier tube T
1Emitter, and ground connection, output terminal passes through resistance R
8Receive power amplifier tube T
1Base stage, power amplifier tube T
1Collector meet power amplifier tube T
2Base stage, and pass through resistance R
9Meet power amplifier tube T
2Collector and+the 15V power supply, operational amplifier A
5Output terminal pass through resistance R
10Receive its negative input end, its positive input terminal passes through resistance R
F1Receive power amplifier tube T
2Emitter, Hall element H
1DC control current input terminal a
1With operational amplifier A
5Positive input terminal join DC control current output terminal c
1Ground connection;
The constant-current source circuit of another Hall element is operational amplifier A
6Positive input terminal pass through resistance R
12Receive reference source U
Ref2, and positive input terminal passes through resistance R
13Ground connection, operational amplifier A
6Negative input end pass through resistance R
14Receive its output terminal, and negative input end passes through resistance R
11Receive operational amplifier A
8Output terminal, operational amplifier A
6Output terminal pass through resistance R
15Receive operational amplifier A
7Negative input end, operational amplifier A
7Negative input end pass through resistance R
16Receive power amplifier tube T
4Emitter, positive input terminal passes through resistance R
17Receive power amplifier tube T
3Emitter, and ground connection, output terminal passes through resistance R
18Receive power amplifier tube T
3Base stage, power amplifier tube T
3Emitter meet power amplifier tube T
4Base stage, its collector passes through resistance R
19Meet power amplifier tube T
4Collector and-the 15V power supply, operational amplifier A
8Output terminal pass through resistance R
20Receive its negative input end, its positive input terminal is by feedback resistance R
F2Receive power amplifier tube T
4Emitter, Hall element H
2DC control current output terminal c
2With operational amplifier A
8Positive input terminal join DC control current input terminal a
2Ground connection.
3. current sensor according to claim 1 and 2; it is characterized in that: outside the insulation course and protective seam of the Rogowski coil of above-mentioned feedback winding and coupled in series; ground plane is set specially to replace above-mentioned ground wire, sets gradually insulation course and protective seam, electro-magnetic screen layer, outermost insulation course and protective seam in this ground plane outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410013110 CN1267734C (en) | 2004-04-28 | 2004-04-28 | Double detection type current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410013110 CN1267734C (en) | 2004-04-28 | 2004-04-28 | Double detection type current sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1570655A true CN1570655A (en) | 2005-01-26 |
| CN1267734C CN1267734C (en) | 2006-08-02 |
Family
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| CN 200410013110 Expired - Fee Related CN1267734C (en) | 2004-04-28 | 2004-04-28 | Double detection type current sensor |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008083610A1 (en) * | 2007-01-06 | 2008-07-17 | Huabin Zhao | A current measuring device and a calibration method for the same |
| CN102292717A (en) * | 2007-10-30 | 2011-12-21 | 大动力公司 | An isolated current to voltage, voltage to voltage converter |
| CN103180742A (en) * | 2010-08-20 | 2013-06-26 | 阿尔斯通技术有限公司 | Rogowski coil assembly |
| CN103308739A (en) * | 2012-03-07 | 2013-09-18 | 深圳市柏特瑞电子有限公司 | Network-type Hall direct current sensor |
| CN104062481A (en) * | 2013-03-19 | 2014-09-24 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Current sensor, matcher and plasma device |
| CN104734156A (en) * | 2013-12-20 | 2015-06-24 | 张绍华 | Active quantum filter |
| CN105606963A (en) * | 2015-11-23 | 2016-05-25 | 国网上海市电力公司 | Test circuit for measuring high-frequency leakage current of cable |
| CN104062481B (en) * | 2013-03-19 | 2016-11-30 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Current sensor, adapter and plasma device |
| CN107015047A (en) * | 2017-04-13 | 2017-08-04 | 国网重庆市电力公司电力科学研究院 | A kind of iron-core-free Hall current sensor |
| CN107132445A (en) * | 2017-04-20 | 2017-09-05 | 广西电网有限责任公司电力科学研究院 | A kind of AC/DC arrester real time on-line monitoring device |
| CN107741518A (en) * | 2017-11-15 | 2018-02-27 | 国网辽宁省电力有限公司鞍山供电公司 | A kind of cable shaft earth current test device of more opening joint testing currents |
| CN105629047B (en) * | 2015-12-24 | 2018-06-22 | 中国船舶重工集团公司第七一〇研究所 | A kind of closed-loop current sensors |
| CN108414798A (en) * | 2018-03-08 | 2018-08-17 | 云南电网有限责任公司电力科学研究院 | A kind of current sensor, monitoring system and monitoring method |
| CN110907680A (en) * | 2018-09-14 | 2020-03-24 | 台达电子工业股份有限公司 | Current detection device, method and system |
| CN117554676A (en) * | 2024-01-11 | 2024-02-13 | 华南理工大学 | Current measuring device and method |
-
2004
- 2004-04-28 CN CN 200410013110 patent/CN1267734C/en not_active Expired - Fee Related
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008083610A1 (en) * | 2007-01-06 | 2008-07-17 | Huabin Zhao | A current measuring device and a calibration method for the same |
| CN102292717A (en) * | 2007-10-30 | 2011-12-21 | 大动力公司 | An isolated current to voltage, voltage to voltage converter |
| CN102292717B (en) * | 2007-10-30 | 2014-09-10 | 大动力公司 | An isolated current to voltage, voltage to voltage converter |
| CN103180742B (en) * | 2010-08-20 | 2015-11-25 | 阿尔斯通技术有限公司 | Rogowski coil assembly |
| CN103180742A (en) * | 2010-08-20 | 2013-06-26 | 阿尔斯通技术有限公司 | Rogowski coil assembly |
| US9442139B2 (en) | 2010-08-20 | 2016-09-13 | Alstom Technology Ltd. | Rogowski coil assembly |
| CN103308739A (en) * | 2012-03-07 | 2013-09-18 | 深圳市柏特瑞电子有限公司 | Network-type Hall direct current sensor |
| CN104062481A (en) * | 2013-03-19 | 2014-09-24 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Current sensor, matcher and plasma device |
| CN104062481B (en) * | 2013-03-19 | 2016-11-30 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Current sensor, adapter and plasma device |
| CN104734156A (en) * | 2013-12-20 | 2015-06-24 | 张绍华 | Active quantum filter |
| CN105606963A (en) * | 2015-11-23 | 2016-05-25 | 国网上海市电力公司 | Test circuit for measuring high-frequency leakage current of cable |
| CN105606963B (en) * | 2015-11-23 | 2019-04-09 | 国网上海市电力公司 | A kind of test circuit leaking high-frequency current for measuring cable |
| CN105629047B (en) * | 2015-12-24 | 2018-06-22 | 中国船舶重工集团公司第七一〇研究所 | A kind of closed-loop current sensors |
| CN107015047A (en) * | 2017-04-13 | 2017-08-04 | 国网重庆市电力公司电力科学研究院 | A kind of iron-core-free Hall current sensor |
| CN107015047B (en) * | 2017-04-13 | 2019-10-15 | 国网重庆市电力公司电力科学研究院 | A kind of iron-core-free Hall current sensor |
| CN107132445A (en) * | 2017-04-20 | 2017-09-05 | 广西电网有限责任公司电力科学研究院 | A kind of AC/DC arrester real time on-line monitoring device |
| CN107132445B (en) * | 2017-04-20 | 2023-06-06 | 广西电网有限责任公司电力科学研究院 | Real-time on-line monitoring device for AC/DC lightning arrester |
| CN107741518A (en) * | 2017-11-15 | 2018-02-27 | 国网辽宁省电力有限公司鞍山供电公司 | A kind of cable shaft earth current test device of more opening joint testing currents |
| CN107741518B (en) * | 2017-11-15 | 2023-12-19 | 国网辽宁省电力有限公司鞍山供电公司 | Cable well grounding current testing device for multi-opening combined current testing |
| CN108414798A (en) * | 2018-03-08 | 2018-08-17 | 云南电网有限责任公司电力科学研究院 | A kind of current sensor, monitoring system and monitoring method |
| CN110907680A (en) * | 2018-09-14 | 2020-03-24 | 台达电子工业股份有限公司 | Current detection device, method and system |
| US11187728B2 (en) | 2018-09-14 | 2021-11-30 | Delta Electronics, Inc. | Current sensing device, method and system |
| CN110907680B (en) * | 2018-09-14 | 2022-03-01 | 台达电子工业股份有限公司 | Current detection device, method and system |
| CN117554676A (en) * | 2024-01-11 | 2024-02-13 | 华南理工大学 | Current measuring device and method |
| CN117554676B (en) * | 2024-01-11 | 2024-04-02 | 华南理工大学 | Current measuring device and method |
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