CN1243248C - Current sensor - Google Patents
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- CN1243248C CN1243248C CN 200310111569 CN200310111569A CN1243248C CN 1243248 C CN1243248 C CN 1243248C CN 200310111569 CN200310111569 CN 200310111569 CN 200310111569 A CN200310111569 A CN 200310111569A CN 1243248 C CN1243248 C CN 1243248C
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Abstract
The present invention discloses a current sensor, which is characterized in that after feedback windings in two symmetrical channels are connected in series, one end of the feedback windings is connected with the ground, and the other ends of the feedback windings are connected with one end of a sampling resistor correspondingly. After the output of two Hall elements symmetrically arranged is magnified by an operational amplifier and is processed by the following steps of wave filtering, the transformation of voltage and current and current amplifying treatment, the output terminals of the Hall elements are connected with the other end of the sampling resistor, and voltage detecting signals at both of the two ends of the electric resistor are sent to a computer. The present invention also comprises a Rogowski coil whose both ends are connected with the sampling resistor in parallel. After voltage detecting signals of the sampling resistor are magnified by the operational amplifier and are processed by wave filtering and integral magnifying, the voltage detecting signals are sent to the computer. After each group of data is processed by the computer, the value of the measured current is sent to a display to be displayed. The present invention obviously improves the saturation characteristic and the linearity of the sensor, and the accuracy is superior to 0.5 %. The present invention has the advantages of good ability of magnetic disturbance resistance, simple structure, and convenient installation, debugging and maintenance. In addition, the additional error of temperature is less than 0.1 %/10 DEG.
Description
Technical field:
The present invention relates to a kind of current sensor, be particularly suitable for being used for current feedback in the power electronic equipment, the control of damming, current stabilization regulate and the big current signal of transient state of DC side overcurrent and short-circuit protection detects.
Background technology:
At RHVC, inverter, ups power, inverter type welder, transformer station, metallide, numerically-controlled machine, microcomputer detecting system, grid monitoring system with need in the every field of the big electric current of isolation detection non-sinusoidal, accurately detecting and the big electric current of control non-sinusoidal, is the basic assurance of device security reliability service and the problem that at first will solve.
Worked out now such as Super-Current Measurement equipment 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.These equipment are broadly divided into two big classes with regard to its principle of work: according to the voltage drop of tested electric current on known resistance, determine the measurement mechanism of tested D.C. high-current size, as shunt; Determine the measurement mechanism of tested size of current according to magnetic field that tested electric current is set up, as the direct measurement mechanism of Rogowski coil.
Use the greatest problem of shunt not import and export not isolation exactly, and, when measuring high frequency or big electric current with shunt, have inductive inevitably, 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, they are based on the mutual inductor of electromagnetic induction principle, have dielectric strength height, reliable operation, advantage such as cheap.But when transient current or di/dt were very 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 big electric 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, make magnetic circuit when transient current or di/dt are very big, also be unlikely to saturated, so pair can reach and react 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 big 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 big electric current.
The magnetic balance type Hall current sensor 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.
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 exactly because of the too big or too high di/dt of amplitude and cause unshakable in one's determination saturated big electric current of transient state such as pulse current, 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 transient current or di/dt when little, its induced signal too a little less than, measuring error is bigger.
Along with the widespread use of Power Electronic Technique in fields such as 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 high frequency, high di/dt, wide spectrum (comprising DC component) current waveform.Little for the transient current in the power electronic equipment, and di/dt is when higher, if adopt shunt, comparator, current transformer, Rogowski coil and Hall element etc. can not satisfy measurement requirement as the conventional device that detects electric current separately.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art part, a kind of current sensor is provided.It is the current sensor that is made of the double check mode Hall element and Rogowski coil, and it obviously improves the saturation characteristic and the linearity of sensor, and is responsive to electric current, can accurately measure the big electric current of high di/dt transient state.
For achieving the above object, the technical solution used in the present invention is: a kind of current sensor, comprise annular core and 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, output terminal after the current amplifying process 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, the sampling resistor of coil two ends parallel connection correspondence, the two ends of this sampling resistor connect the positive and negative input end of operational amplifier respectively, and 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, the signal after the integration processing and amplifying is delivered to computing machine; By the signal after above-mentioned detectable voltage signals of Computer Processing and the integration processing and amplifying, after the processing tested size of current is delivered to display and show.
Outside the insulation course and protective seam of above-mentioned feedback winding and Rogowski coil, ground plane is set specially to replace above-mentioned ground wire, set 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 offsets voluntarily in circuit.
2, this sensor utilizes the no inductance and the fast response characteristic of Hall element, measures the electric current of the not too big or not too high di/dt of amplitude in the power electronics circuit, promptly measures and can cause magnetic saturation unshakable in one's determination because of the too big or too high di/dt of amplitude.Save and the detection of DC side excess current because because of the access of sensor changes original di/dt value, therefore, it is particularly suitable for being used for current feedback in the power electronic equipment, the control of damming, current stabilization are withered.
3, this sensor utilizes no saturation problem, bandwidth, the fast response characteristic of Rogowski coil; measure in the power electronics circuit because of the too big or too high di/dt of amplitude causes saturated non-sinusoidal transient current unshakable in one's determination, promptly it be particularly suitable for being used for current feedback in the power electronic equipment, the detection of the current signal of dam control and short-circuit protection.
4, 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 (a) is the structural representation of an embodiment of the present invention.
Fig. 1 (b) is two skeleton core position views of an embodiment of the present invention.
Fig. 2 is Hall element H among Fig. 1 (a)
1, H
2Symmetric arrangement and Rogowski coil circuit figure.
Fig. 3 (a) is Hall element H among Fig. 1 (a)
1Constant-current source circuit figure.
Fig. 3 (b) is Hall element H among Fig. 1 (a)
2Constant-current source circuit figure.
Fig. 4 (a) is round section skeleton core F among Fig. 1 (a)
1Structural representation.
Fig. 4 (b) is square-section skeleton core F among Fig. 1 (a)
2Structural representation.
Embodiment
Shown in Fig. 1 (a), 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 the hall detection component of symmetric arrangement; 4 for handling filtering, the integrating amplification circuit from the induced voltage of Rogowski coil detecting element, and its output voltage is U
S25 is tested current bus bar; 6 is special-purpose ground plane; F
1And F
2Be two 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
S1Terminal voltage for sampling resistor RX; 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
3Be the Rogowski coil.
A kind of current sensor is by two skeleton cores (Frame) F
1And F
2Form skeleton core F
1Be to constitute by iron core, skeleton core F
2By the epoxy resin bar construction.Iron core F
1Diametric(al) offer air-gap, the core length of each passage equates, air gap evenly, be symmetrically distributed, Hall element places air gap.On the iron core outer insulating material, even close feedback winding coil around the multi-turn curl.This feedback winding coil also can be according to the coiling of Rogowski coil mode.During coiling feedback winding, must be noted that coil winding-direction, guarantee that sensor realization 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.Because opening is big more, iron core is difficult for saturated more.But after opening was big, the magnetic field in the air-gap can disperse, the effect that has just lost magnetism gathering rings unshakable in one's determination like this, and opening unshakable in one's determination too conference be unfavorable for the accuracy of mutual inductor.Therefore, gas length can be taken into account tested size of current and core dimensions size requirements, otherwise can influence the sensor measurement precision less than long-pending subduplicate 10～15 times of core section; In order to strengthen the sensor sensing signal,, can increase skeleton core F as far as possible not changing under other size prerequisite of sensor
1Axial width, then gas length also can correspondingly increase.In addition, the 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 length of air-gap is bigger, and unshakable in one's determination just healing can be more unsaturated, but the consideration opening is many accuracy of mutual inductor is descended, and also can increase manufacturing cost on the other hand, and makes physical strength decline unshakable in one's determination.So open amount unshakable in one's determination should be the least possible.Hall element H
1And H
2Symmetric arrangement is by 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
S1The other end, be transported to feedback winding then separately and produce a reversed magnetic field and balance each other with the magnetic field that tested electric current produces, realize zero magnetic-flux measurement principle.Sampling resistor R
S1The voltage at two ends is delivered to computing machine 2.Foregoing circuit 3 is common filtering, voltage-to-current conversion, current amplification circuit.
At skeleton core F
2On the outer insulating material, evenly close around the Rogowski of individual pen curl coil, by skeleton core F
2The line that unrolls is drawn at the center, at this coil two ends parallel connection sampling resistor R
S2, sampling resistor R
S2Two ends connect operational amplifier A respectively
2Positive and negative input end, and positive input terminal ground connection, its output is delivered to computing machine 2 by filtering, integrating amplification circuit 4.Select operational amplifier A
2Must consider its Slew Rate, ascending velocity, drift and precision, the general low drift of the high speed precision operational-amplifier of selecting.Circuit 4 is common filtering, integrating amplification circuit.
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.
Be easy to find out, if skeleton core F
1The air gap number be 10, two Hall elements of symmetric arrangement are as one group, then have five groups, at this moment being input to just has five groups of data in the computing machine 2, add from one group of the output of Rogowski coil, 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.
Shown in Fig. 1 (b), for easy for installation, two skeleton core F
1And F
2Should choose same size, 20 is skeleton core F
2The loop line groove.For the position relation of two skeleton cores is described; Fig. 1 (b) has exaggerated the spacing distance d between them; after they twined separately 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, they tightly are fixed together formed an integral body.
By shown in Figure 2, I
+And I
-For by positive-negative power, power respectively and flow the Hall element H that place for two symmetries
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; A
1The expression operational amplifier; R
KThe expression operational amplifier A
1The enlargement factor controlling resistance; 5 is tested current bus bar; * number three winding W of expression
1, W
2And W
3End of the same name.This circuit connecting is Hall element H
1D
1End, Hall element H
2B2 end respectively with operational amplifier A
1Negative input end, positive input terminal join 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 a2 ground connection, Hall element H
1B
1The d of end and Hall element HX
2End joins.Feedback winding W
1And W
2After the series connection, an end and sampling resistor R
S1Join other end ground connection.Sampling resistor R
S1Two terminate to computing machine 2.Above-mentioned resistance R
KCan select precision resister for use, 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.Because with Hall element H
1B
1With Hall element H
2D
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
1(perhaps a
2, c
2) flow 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
1(perhaps b
2, d
2) terminal just produces Hall voltage, operational amplifier A
1Can amplify the Hall voltage difference is U
H=U
H1-U
H2, its enlargement factor is by controlling resistance R
KControl, promptly enlargement factor is approximately 1+50k Ω/R
K, send into treatment circuit 3 again and handle.
Shown in Fig. 3 (a), its concrete connection 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 principle of work of Fig. 3 (a) is summarized as follows: reference source U
Ref1, through 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. 3 (b), its concrete connection 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 joins, DC control current input terminal a
2Ground connection.
The principle of work of Fig. 3 (b) is summarized as follows: reference source U
Ref2, through totalizer A
6, feedback amplifier A7, by the electric current of current-amplifying driving circuit (T3, T4) output high stable.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 is 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
FSelect high-accuracy resistance for use, and its resistance is near the input resistance value R of Hall element
Hi(i=1,2) satisfy R
P+ 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.
Shown in Fig. 4 (a), 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.
Shown in Fig. 4 (b), skeleton core F
2Be processed into the annular shape of square-section, certainly, also can be processed into the annular shape of round section, skeleton core F
2Can choose soft rubber belt (or epoxy resin rod).The circle because the Rogowski coil need unroll when coiling, and from skeleton core F
2Draw at the center, therefore, and need be at the skeleton core center of Rogowski coil to loop line groove 20 of external-open.At skeleton core F
2Insulation course and protective seam 13 outside close around Rogowski coil 14; again at coil 14 outside coiling insulation courses and protective seam 15; outside it; the ground plane 16 of sensor is set specially again; set gradually insulation course and protective seam 17, electro-magnetic screen layer 18, outermost insulation course and protective seam 19 in these ground plane 16 outsides.
Claims (3)
1, a kind of current sensor comprises annular core and 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, output terminal after the current amplifying process connects the other end of above-mentioned sampling resistor, with the detectable voltage signals U at these sampling resistor two ends
S1Deliver to computing machine;
It also comprises the Rogowski coil, the sampling resistor of coil two ends parallel connection correspondence, the two ends of this sampling resistor connect the positive and negative input end of operational amplifier respectively, and 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, the signal U after the integration processing and amplifying
S2Deliver to computing machine;
By the above-mentioned detectable voltage signals U of Computer Processing
S1With the signal U after the integration processing and amplifying
S2, after the processing tested size of current is delivered to display and shows.
2, current sensor according to claim 1; it is characterized in that: outside the insulation course and protective seam of above-mentioned feedback winding and Rogowski coil; 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.
3, current sensor according to claim 1 and 2 is characterized in that: receive in above-mentioned every group, two constant-current source circuits of two Hall elements are 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;
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310111569 CN1243248C (en) | 2003-12-12 | 2003-12-12 | Current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310111569 CN1243248C (en) | 2003-12-12 | 2003-12-12 | Current sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1547035A CN1547035A (en) | 2004-11-17 |
| CN1243248C true CN1243248C (en) | 2006-02-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310111569 Expired - Fee Related CN1243248C (en) | 2003-12-12 | 2003-12-12 | Current sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1243248C (en) |
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- 2003-12-12 CN CN 200310111569 patent/CN1243248C/en not_active Expired - Fee Related
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