CN1580788A - Direct current sensor - Google Patents
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- CN1580788A CN1580788A CN 200410013173 CN200410013173A CN1580788A CN 1580788 A CN1580788 A CN 1580788A CN 200410013173 CN200410013173 CN 200410013173 CN 200410013173 A CN200410013173 A CN 200410013173A CN 1580788 A CN1580788 A CN 1580788A
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Abstract
The present invention discloses a DC curren sensor. In said sensor a detection coil is added, said sensor adopts single-core three-winding structure, when a DC bias magnet is existed in the magnetic core, the induced potential obtained by detection coil can produce positive-negative half-wave unsmmetrical waveforms, said waveforms can be converted into the voltage signal of difference of positive-negative half-wave effective values, after voltage/current conversio, said signal can be fed into feedback winding, said feedback winding cap produce the DC magnetic potential whose direction is opposite to that of magnetic patential produced by detected direct current to balance the bias magnetic potential produced by detected direct current to form 'null-flux' state, so that it can obtain the detected direct current intensity so as to implement the detection of direct current.
Description
Technical field
The present invention relates to a kind of DC current sensor, be suitable for detecting the DC current that comprises following aspect: as be used for current feedback in the power electronic equipment, the dc current signal of aspects such as the control of damming, current stabilization adjusting, DC side overcurrent, electric system and electrolysis industry 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 DC current, accurately detecting and the control DC current, is the basic assurance of device security reliability service and the problem that at first will solve.
Worked out now such as current measure devices such as DC current comparator, direct current instrument transformer, shunts; Some measuring equipments based on physical influences such as magneto-optic effect and nuclear magnetic resonance have also appearred.
The greatest problem of using shunt to measure direct current is not imported exactly and is exported and isolates, and when tested electric current was very big, shunt was more serious because of the too big heating problem of power consumption, and, after inserting shunt, can influence the electric parameter in tested loop, promptly can not truly reflect the electrical specification in tested loop.
For present a large amount of transformer type current transformers that adopt, have dielectric strength height, reliable operation, advantage such as cheap.When excitatory ampere-turn is zero, the secondary ampere-turn changes can reflect fully that former limit ampere-turn changes, error is zero, the magnetic core of this moment is in " zero magnetic flux " state, it works in the The initial segment (being linearity range) of magnetization curve, and at this moment, the current transformer output waveform just can not distort, can keep good linearty, this is " zero magnetic flux " principle.Therefore, if can make transformer core be in zero magnetic flux state all the time, just can fundamentally eliminate the error of current transformer.But, by the principle of work of mutual inductor as can be known, be impossible realize zero magnetic flux by mutual inductor self, compensation or adjustment that must outer boundary condition.For this reason, magnetrol comparator (hereinafter to be referred as magnetrol) and magnetic modulator comparator (hereinafter to be referred as magnetic modulator) have occurred, they all are to adopt " zero magnetic flux state " principle to carry out direct current measurement.
The simplest magnetrol is made up of annular single magnetic core saturable reactor and two windings, as long as keep excitation voltage constant, ac output current and voltage will change with the DC current in the input direct current winding so.There is critical defect in this amplifier: when the number of turn of direct current winding more for a long time, according to the transformer action principle as can be known, alternating voltage in the field winding will induce alternating voltage in the direct current winding, in order effectively to suppress the induced voltage in the DC control circuit, must in circuit, seal in an inductance or have to adopt the bimag structure, will make its complex structure so, volume is big and heavy.
Magnetic modulator divides two kinds of single magnetic core and bimags, and the most frequently used is the bimag structure.Therefore be example with the differential magnetic modulator of bimag, it necessarily requires two magnetic cores to have same structure size and on all four magnetic characteristic, and false equilibrium point appearred in the open loop characteristic curve of magnetic modulator, has reduced the magnetic modulator reliability of operation.In order to obtain the premium properties of magnetic modulator, must improve the performance of ferromagnetic material, therefore, should select core material such as the 1J85 or the 1J86 permalloy of high permeability, low-coercivity for use, and adopt the magnetic core and the strict pairing magnetic core of high squareness ratio, the strict symmetry of waveform of requirement excitation power supply and amplitude of output voltage and frequency must be stablized to guarantee that the magnetic modulator magnetic core is operated in abundant state of saturation, just because of these characteristics have limited the application and the popularization of magnetic modulator.As " measurement technology " 2000 the 6th phases, name is called said magnetic modulator in " DC current source that adopts DC current comparator principle ".
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art part, a kind of DC current sensor is provided.This sensor has increased a magnetic test coil, adopt single magnetic core three winding constructions, when having DC magnetic biasing in the magnetic core, the asymmetric distorted waveform of positive and negative half-wave will appear in the induced potential that magnetic test coil obtains, after the difference process voltage/current conversion with the positive and negative half-wave effective value of this waveform, being converted to feedback current sends in the feedback winding, produce the rightabout direct current magnetic potential of magnetic potential that is produced with tested direct current by the feedback winding, the magnetic bias magnetic potential that is produced with the tested direct current of balance, form " zero magnetic flux state ", thereby realize the detection task of DC current.
For achieving the above object, the technical solution used in the present invention is: a kind of DC current sensor comprises toroidal core, coiling excitation winding W on ring-shaped core
S, feedback winding W
2With magnetic test coil W
M, at excitation winding W
STwo termination treatment circuits, excitation winding W
STreatment circuit is excitation winding W
SExciting current I is provided
S, and will reflect exciting current I
SVoltage signal deliver to computing machine; At magnetic test coil W
MTwo termination treatment circuits, magnetic test coil W
MTreatment circuit is with magnetic test coil W
MThe induced potential that obtains is converted to the difference signal of positive and negative half-wave effective value, delivers to feedback winding W
2Treatment circuit, and with magnetic test coil W
MThe voltage signal of the induced potential that obtains is delivered to computing machine; At feedback winding W
2Two termination treatment circuits, computing machine is according to the exciting current I that obtains
SBig or small Control and Feedback winding W with induced potential
2The duty of treatment circuit, feedback winding W
2Treatment circuit is converted to electric current I with the difference signal of above-mentioned positive and negative half-wave effective value
2, send into feedback winding W
2In, and will reflect feedback current I
2Voltage signal deliver to computing machine, computing machine is handled above-mentioned three groups of different voltage signals, will reflect measured current I
1The voltage signal of size is delivered to display and is shown.
The invention has the advantages that:
(1) adopt single magnetic core three winding constructions, little, the compact conformation of size sensor is easy to processing and fabricating.
(2) adopt single ring core structure, because the direct current winding is generally single-turn circular coil, so the alternating voltage that the alternating voltage in the field winding is induced in the direct current winding can be ignored, do not need current-limiting reactor in the direct current winding, therefore, both can reduce the physical dimension of whole sensor, and can give full play to the control advantage of saturable reactor again.
(3) in traditional annular saturable reactor structure, increase a magnetic test coil, both can fast and effeciently detect the duty of ac-excited electric current, can react the magnetic modulation condition of magnetic core again reliably, the structure of sensor does not become complicated and heavy because of increasing a magnetic test coil, and easy to process.
(4) magnetic test coil is according to the coiling of Rogowski coil mode, and magnetic test coil is subjected to the position influence of the influence of external magnetic field and tested current little, therefore can effectively improve the anti-external magnetic field interference capability of sensor.
(5) utilize the difference of the positive and negative half-wave effective value of induced potential of magnetic test coil to participate in control, its open loop output characteristic curve false equilibrium point can not occur, has improved the reliability of operating sensor.
(6) adopt switching device to participate in FEEDBACK CONTROL, make things convenient for computing machine directly to control, help realizing automatically, operation, and treatment circuit fast can modularization, interchangeability is good.
In a word, obviously improved the open loop output characteristics of sensor; 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, response speed is fast, highly sensitive, interchangeability is good, 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 principle schematic of Fig. 1 embodiment.
Fig. 3 (a) is the difference U of the positive and negative half-wave effective value of magnetic test coil output voltage among Fig. 1
D(V) with DC magnetic biasing magnetic potential I
1W
1(AT) open loop output characteristic curve, its horizontal ordinate DC magnetic biasing magnetic I
1W
1(AT) expression, the ordinate difference U of the positive and negative half-wave effective value of magnetic test coil output voltage
D(V) expression.
Fig. 3 (b) is the total effective value U of magnetic test coil among Fig. 1
T(V) with DC magnetic biasing magnetic potential I
1W
1(AT) open loop output characteristic curve, its horizontal ordinate DC magnetic biasing magnetic potential I
1W
1(AT) expression, ordinate is with the total effective value U of magnetic test coil
T(V) expression.
Fig. 4 is excitation winding W among Fig. 1
SThe physical circuit figure of treatment circuit 6.
Fig. 5 is magnetic test coil W among Fig. 1
MThe physical circuit figure of treatment circuit 4.
Fig. 6 is feedback winding W among Fig. 1
2The physical circuit figure of treatment circuit 5.
Fig. 7 is the composition synoptic diagram of computing machine 2 among Fig. 1.
Fig. 8 is the structural representation of another embodiment of the present invention.
Embodiment
By Fig. 1, shown in Figure 2, W
MBe magnetic test coil, the electric current that this coil midstream is crossed is I
M, W
2Be the feedback winding, the electric current that flows through in this winding is I
2, W
SBe the excitation winding, the electric current that flows through in this winding is I
S, 1 is display, and 2 is computing machine, and 3 is ring-shaped core, and 4 is magnetic test coil W
MTreatment circuit, 5 are feedback winding W
2Treatment circuit, 6 are excitation winding W
STreatment circuit, 7 is the sensor mask layer, 8 is the outer retaining ring of sensor, I
1Be tested direct current, * represents magnetic test coil W
M, excitation winding W
SWith feedback winding W
2End of the same name.
Coiling excitation winding W on ring-shaped core 3
S, feedback winding W
2With magnetic test coil W
M, at magnetic test coil W
MTwo termination treatment circuits 4, at feedback winding W
2Two termination treatment circuits 5, at excitation winding W
STwo termination treatment circuits 6.Magnetic test coil W
MAn output terminal d of treatment circuit 4 meets feedback winding W
2The input end of treatment circuit 5, another output terminal a connects the input end of computing machine 2; Two output terminal e of computing machine 2 and f meet feedback winding W respectively
2Two input ends of treatment circuit 5, its output terminal b connects the input end of computing machine 2; Excitation winding W
SThe output terminal c of treatment circuit 6 connects the input end of computing machine 2; The output terminal g of computing machine 2 connects the input end of display 1.
Magnetic test coil W
MPreferably, promptly close around W according to the coiling of Rogowski coil mode
MAfter the circle, the circle that unrolls again goes back.
At excitation winding W
SIn to pass to frequency be f
～, amplitude is U
～mSinusoidal voltage, with the excitation toroidal core 3, magnetic test coil W
MIn just can produce induced potential.
As measured DC I
1When being zero, because the nonlinear characteristic of saturable reactor makes induced potential present the distorted waveform of positive and negative half-wave symmetry.
As measured DC I
1When non-vanishing, suppose this electric current I
1For just and not changing, when the positive half cycle of excitation voltage, magnetic flux and direct current input current I that excitation voltage produces
1The flow direction that is produced is identical, mutual superposition, and magnetic induction density increases.Nonlinear reactance device in the magnetic core 3 is operated in the magnetic saturation district, because the decline of nonlinear magnetism conductance is very fast, the inductance of nonlinear reactance device descends very fast, and induction reactance also can descend very fast, so exciting current I
SWill increase very fast.As tested direct current I
1For just and not changing, when the excitation voltage negative half period, magnetic flux and direct current input current I that excitation voltage produces
1The flow direction that is produced is opposite, cancels out each other, and magnetic induction density descends, nonlinear reactance device in the magnetic core is operated in non-magnetic saturation district, the very fast rising of nonlinear magnetism conductance, and the inductance increase of nonlinear reactance device is very fast, induction reactance also can increase very fast, so exciting current I
SIt is very fast to descend.Excitation winding W
SIn electric current I
SPositive and negative half cycle amplitude changes difference and distortion causes induced potential to present the asymmetric distorted waveform of positive and negative half-wave.Utilize magnetic test coil W
MTreatment circuit 4 is converted to the poor of positive and negative half-wave effective value with induced potential, again through feedback winding W
2Treatment circuit 5 carries out after the voltage/current conversion, sends into feedback winding W
2In, form and tested direct current I
1The rightabout direct current magnetic potential of the magnetic potential that is produced is with the tested direct current I of balance
1The magnetic potential that is produced reaches " zero magnetic flux " state.At this moment, the total ampere-turn I of tested direct current
1W
1With feedback total ampere-turn I that winding produced
2W
2Tested direct current equates, so can be expressed as I
1=I
2W
2/ W
1, direct current winding W wherein
1Be 1 circle, feedback winding W
2Be known parameters, feedback current I
2Can detect acquisition by computing machine 2, therefore can obtain tested direct current I
1Size, thereby realize the detection of DC current.
Take into account exciting current I
SSize and size sensor require to choose suitable excitation winding W
SThe number of turn, according to the law of electromagnetic induction as can be known, in order to ensure magnetic test coil W
MTreatment circuit 4 and feedback winding W
2Treatment circuit 5 can be because of magnetic test coil W
MThe amplitude of the induced potential that obtains is too little and be affected magnetic test coil W
MThe number of turn can with excitation winding W
SThe number of turn be close, take into account measured current I
1Size, feedback current I
2Suitable feedback winding W is chosen in size and size sensor requirement
2The number of turn.
By Fig. 3 (a) and Fig. 3 (b) as can be known, can there be false equilibrium point in two kinds of open loop output characteristic curves of this sensor.Along with the increase of DC magnetic bias current, magnetic test coil W
MThe positive and negative half-wave effective value of the induced potential that obtains and total effective value all can reduce, when magnetic core 3 is in degree of depth state of saturation, and magnetic test coil W
MThe induced potential that obtains can be very little, and noise is bigger, can not directly utilize the difference of the positive and negative half-wave effective value of induced potential to participate in FEEDBACK CONTROL, therefore must judge by the magnetic state of 2 pairs of magnetic cores 3 of computing machine.
By shown in Figure 4, excitation winding W
SThe structure of treatment circuit 6 is that the output terminal of signal generator chip IC 1 is successively by voltage follower IC2, power amplifier IC3 and excitation winding W
SAn end J
1Join J
1The negative terminal of terminating diode D1, the positive termination excitation winding W of diode D1
SOther end J
2, and by current-limiting resistance R
SGround connection, the input end of the positive termination low-pass filter LPF1 of diode D1, the input end of the output termination voltage follower IC22 of low-pass filter LPF1, the output terminal c of voltage follower IC22 connects computing machine 2.
The sine wave that chip IC 1 produces is delivered to after the power amplifier IC3 amplification through voltage follower IC2, delivers to excitation winding W again
SIn, current-limiting resistance R
STerminal voltage U
RSHandle through delivering to computing machine 2 after low-pass filter LPF1, the voltage follower IC22 processing.
In Fig. 4, each components and parts can be selected as follows: chip IC 1 is for producing the chip of standard sine wave, as ICL8038; Voltage follower IC2, IC22 are conventional voltage follower circuit; Power amplifier IC3 is fool's power amplifier (market is on sale); Low-pass filter LPF1 is conventional homophase input second order voltage controlled voltage source low-pass filter circuit.
By shown in Figure 5, magnetic test coil W
MThe structure of treatment circuit 4 is sampling resistor R
XMeet magnetic test coil W
MTwo ends M
1And M
2, M
1And M
2Two ends connect the negative of operational amplifier IC4 respectively, positive input terminal, positive input terminal ground connection, the low-pass filter of output termination LPF2 of operational amplifier IC4, the output termination in-phase amplifier IC5 of low-pass filter LPF2, the output terminal of in-phase amplifier IC5 is successively by positive half-wave rectification circuit IC6 with the transducer IC8 that real effective becomes direct current is connect the positive input terminal of totalizer IC10, another output terminal of in-phase amplifier IC5 is successively by negative half-wave rectifying circuit IC7 with the transducer IC9 that real effective becomes direct current is connect the positive input terminal of totalizer IC11, producing the chip IC 12 of reference voltage and the negative input end of totalizer IC10 and IC11 joins, the output terminal of totalizer IC10 and IC11 is just meeting operational amplifier IC13 respectively, negative input end, the output terminal of operational amplifier IC13 connects the input end of inverting amplifier IC15 by inverting integrator IC14, the input end of the output termination voltage follower IC21 of low-pass filter LPF2, the output terminal a of voltage follower IC21 connects computing machine 2.
In Fig. 5, each components and parts can be selected as follows: operational amplifier IC4 can be instrument operational amplifier such as AD521, AD620; Low-pass filter LPF2 can be conventional homophase input second order voltage controlled voltage source low-pass filter circuit; IC5 is conventional in-phase amplifier circuit; IC6 is conventional positive half-wave rectification circuit; IC7 is conventional negative half-wave rectifying circuit; The transducer IC8 and the IC9 that real effective are become direct current can adopt the AD736 chip, and its direct current output is respectively U
RMS+And U
RMS-Totalizer IC10 and IC11 can be made of with operational amplifier such as AD521, AD620 instrument, and its output signal is respectively U
RMS+-U
REFAnd U
RMS--U
REFProduce reference voltage U
REFChip IC 12 can be 5V reference voltage chip REF02; Operational amplifier IC13 can be instrument operational amplifier such as AD521, AD620; IC14 is conventional inverting integrator circuit; IC15 is conventional inverting amplifier circuit; IC21 is conventional voltage follower circuit.
By shown in Figure 6, feedback winding W
2The structure of treatment circuit 5 is, the output terminal d of above-mentioned inverting amplifier IC15 connects the input end of voltage IC16, and the collector of the output termination switching tube K2 of voltage IC16 is given feedback winding W
2The collector of exporting termination switching tube K1 of the direct supply IC17 of the energy is provided, the input end of another output termination voltage IC16, an output terminal e of computing machine 2 joins by the base stage of control circuit IC18 and switching tube K1, another Ausgang joins by the base stage of control circuit IC19 and switching tube K2, the emitter of switching tube K1 and K2 joins, and meets feedback winding W
2An end S
1, feedback winding W
2Other end S
2By current-limiting resistance R ground connection, the negative terminal of sustained diode 2 meets feedback winding W
2S
1End, positive ending grounding, feedback winding W
2S
2End connects computing machine 2 by the output terminal b of low-pass filter LPF3, voltage follower IC20.
In Fig. 6, each components and parts can be selected as follows: IC16 is conventional voltage current transformating circuit; Give feedback winding W
2The IC17 that the energy is provided is for conventional direct supply, as dc switching power supply; Switching tube K1 and K2 can adopt IGBT, and IC18 and IC19 are the control circuit of switching tube K1 and K2 routine, and when K1 and K2 employing IGBT, IC18 and IC19 are their thick film driving circuit, as EXB840; IC20 is conventional voltage follower.
If measured DC I
1Very big, cause magnetic core 3 to be in the degree of depth state of saturation, at this moment, magnetic test coil W
MIn induced potential can be very little, excitation winding W
SThe undistorted sinusoidal waveform that promptly presents of electric current.Therefore, need allow computing machine 2 detect magnetic test coil W respectively
MIn induced potential and excitation winding W
SCurrent waveform, whether be in degree of depth state of saturation to judge magnetic core 3.If magnetic core 3 is in degree of depth state of saturation really, computing machine 2 Control and Feedback winding W
2Switching tube K1 conducting and K2 in the treatment circuit 5 end, by direct supply IC17 directly to feedback winding W
2In pass to feedback current, its direction and tested direct current I
1The magnetic potential that is produced is opposite.Simultaneously, computing machine 2 constantly detects magnetic test coil W
MIn induced potential and excitation winding W
SCurrent waveform, whether withdraw from degree of depth state of saturation to judge magnetic core 3.In case find that magnetic core 3 withdraws from degree of depth state of saturation, computing machine 2 is on-off switching tube K1 just, and makes switching tube K2 conducting, utilizes magnetic test coil W
MThe mobile equilibrium of carrying out " zero magnetic flux " of the difference of the positive and negative half-wave effective value of induced potential handle.
Computing machine 2 is except can adopting common computing machine, also can be as shown in Figure 7: computing machine 2 comprises multi-channel A/D capture card IC27 and single-chip microcomputer IC28, the output terminal c of the output terminal b of voltage follower IC20, the output terminal a of voltage follower IC21, voltage follower IC22 meets multi-channel A/D capture card IC27 respectively by controllable gain amplifier IC26, and the output terminal g of single-chip microcomputer IC28 connects the input end of display 1.
Multi-channel A/D capture card IC27 market is on sale, and high-grade single-chip microcomputer IC28 can select the process chip as DSP for use, also can select public control machine.IC23, IC24 and IC25 are respectively conventional homophase input second order voltage controlled voltage source low-pass filter, and IC26 is conventional controllable gain amplifier, adopts after them, can obviously improve the voltage waveform quality of giving computing machine 2.
IC29 represents to extend out the standard traffic mouth, IC30 represent can be external the D/A transition card reproduce simulating signal, IC31 represents to extend out control mouthful, IC32 represents to extend out the pulse delivery outlet is convenient to export Transistor-Transistor Logic level.
For obtaining the premium properties of sensor, can select low-loss and good overload capacity for use, promptly stand core material such as the 1J85 or the 1J86 permalloy of high permeability, low-coercivity and the high squareness ratio of saturated magnetization rush of current ability.In addition, because the magnetic property of this material is influenced greatly by mechanical stress, therefore retaining ring 12 outside its outside installation, and require not have flip-flop, output voltage amplitude and frequency stabilization in the waveform of excitation power supply.
By shown in Figure 8, as tested direct current I
1Hour, coiling direct current winding W on ring-shaped core 3
1, the tested dc wire of its two termination, L
1For being connected on the inductance in the tested dc power supply circuit, be used to suppress field winding W
SIn alternating voltage at direct current winding W
1Middle alternating voltage induced.
For the convenience of measuring, the present invention can make the sensor of clamp type structure.
Claims (10)
1. a DC current sensor comprises toroidal core, coiling excitation winding W on ring-shaped core
S, feedback winding W
2, its characteristic is: go up coiling magnetic test coil W at ring-shaped core (3)
M,
At excitation winding W
STwo termination treatment circuits (6), excitation winding W
STreatment circuit (6) is excitation winding W
SExciting current I is provided
S, and will reflect exciting current I
SVoltage signal deliver to computing machine (2);
At magnetic test coil W
MTwo termination treatment circuits (4), magnetic test coil W
MTreatment circuit (4) is with magnetic test coil W
MThe induced potential that obtains is converted to the difference signal of positive and negative half-wave effective value, delivers to feedback winding W
2Treatment circuit (5), and with magnetic test coil W
MThe voltage signal of the induced potential that obtains is delivered to computing machine (2);
At feedback winding W
2Two termination treatment circuits (5), computing machine (2) is according to the exciting current I that obtains
SBig or small Control and Feedback winding W with induced potential
2The duty of treatment circuit (5), feedback winding W
2Treatment circuit (5) is converted to electric current I with the difference signal of above-mentioned positive and negative half-wave effective value
2, send into feedback winding W
2In, and will reflect feedback current I
2Voltage signal deliver to computing machine (2);
Computing machine (2) is handled above-mentioned three groups of different voltage signals, will reflect measured current I
1The voltage signal of size is delivered to display (1) and is shown.
2. DC current sensor according to claim 1, its characteristic is: magnetic test coil W
MAccording to the coiling of Rogowski coil mode.
3. DC current sensor according to claim 1 and 2, its characteristic is: excitation winding W
SThe structure of treatment circuit (6) is that the output terminal of signal generator chip IC 1 is successively by voltage follower IC2, power amplifier IC3 and excitation winding W
SAn end J
1Join J
1The negative terminal of terminating diode D1, the positive termination excitation winding W of diode D1
SOther end J
2, and by current-limiting resistance R
SGround connection, the input end of the positive termination low-pass filter LPF1 of diode D1, the input end of the output termination voltage follower IC22 of low-pass filter LPF1, the output terminal c of voltage follower IC22 connects computing machine (2).
4. DC current sensor according to claim 1 and 2, its characteristic is: magnetic test coil W
MThe structure of treatment circuit (4) is sampling resistor R
XMeet magnetic test coil W
MTwo ends M
1And M
2, M
1And M
2Two ends connect the negative of operational amplifier IC4 respectively, positive input terminal, positive input terminal ground connection, the low-pass filter of output termination LPF2 of operational amplifier IC4, the output termination in-phase amplifier IC5 of low-pass filter LPF2, the output terminal of in-phase amplifier IC5 is successively by positive half-wave rectification circuit IC6 with the transducer IC8 that real effective becomes direct current is connect the positive input terminal of totalizer IC10, another output terminal of in-phase amplifier IC5 is successively by negative half-wave rectifying circuit IC7 with the transducer IC9 that real effective becomes direct current is connect the positive input terminal of totalizer IC11, producing the chip IC 12 of reference voltage and the negative input end of totalizer IC10 and IC11 joins, the output terminal of totalizer IC10 and IC11 is just meeting operational amplifier IC13 respectively, negative input end, the output terminal of operational amplifier IC13 connects the input end of inverting amplifier IC15 by inverting integrator IC14, the input end of the output termination voltage follower IC21 of low-pass filter LPF2, the output terminal a of voltage follower IC21 connects computing machine (2).
5. DC current sensor according to claim 3, its characteristic is: magnetic test coil W
MThe structure of treatment circuit (4) is sampling resistor R
XMeet magnetic test coil W
MTwo ends M
1And M
2, M
1And M
2Two ends connect the negative of operational amplifier IC4 respectively, positive input terminal, positive input terminal ground connection, the low-pass filter of output termination LPF2 of operational amplifier IC4, the output termination in-phase amplifier IC5 of low-pass filter LPF2, the output terminal of in-phase amplifier IC5 is successively by positive half-wave rectification circuit IC6 with the transducer IC8 that real effective becomes direct current is connect the positive input terminal of totalizer IC10, another output terminal of in-phase amplifier IC5 is successively by negative half-wave rectifying circuit IC7 with the transducer IC9 that real effective becomes direct current is connect the positive input terminal of totalizer IC11, producing the chip IC 12 of reference voltage and the negative input end of totalizer IC10 and IC11 joins, the output terminal of totalizer IC10 and IC11 is just meeting operational amplifier IC13 respectively, negative input end, the output terminal of operational amplifier IC13 connects the input end of inverting amplifier IC15 by inverting integrator IC14, the input end of the output termination voltage follower IC21 of low-pass filter LPF2, the output terminal a of voltage follower IC21 connects computing machine (2).
6. DC current sensor according to claim 1 and 2, its characteristic is: feedback winding W
2The structure of treatment circuit (5) is, the output terminal d of above-mentioned inverting amplifier IC15 connects the input end of voltage IC16, and the collector of the output termination switching tube K2 of voltage IC16 is given feedback winding W
2The collector of exporting termination switching tube K1 of the direct supply IC17 of the energy is provided, the input end of another output termination voltage IC16, an output terminal e of computing machine 2 joins by the base stage of control circuit IC18 and switching tube K1, another Ausgang joins by the base stage of control circuit IC19 and switching tube K2, the emitter of switching tube K1 and K2 joins, and meets feedback winding W
2An end S1, feedback winding W
2Other end S
2By current-limiting resistance R ground connection, the negative terminal of sustained diode 2 meets feedback winding W
2S
1End, positive ending grounding, feedback winding W
2S
2End connects computing machine (2) by the output terminal b of low-pass filter LPF3, voltage follower IC20.
7. DC current sensor according to claim 5, its characteristic is: feedback winding W
2The structure of treatment circuit (5) is, the output terminal d of above-mentioned inverting amplifier IC15 connects the input end of voltage IC16, and the collector of the output termination switching tube K2 of voltage IC16 is given feedback winding W
2The collector of exporting termination switching tube K1 of the direct supply IC17 of the energy is provided, the input end of another output termination voltage IC16, an output terminal e of computing machine 2 joins by the base stage of control circuit IC18 and switching tube K1, another Ausgang joins by the base stage of control circuit IC19 and switching tube K2, the emitter of switching tube K1 and K2 joins, and meets feedback winding W
2An end S
1, feedback winding W
2Other end S
2By current-limiting resistance R ground connection, the negative terminal of sustained diode 2 meets feedback winding W
2S
1End, positive ending grounding, feedback winding W
2S
2End connects computing machine (2) by the output terminal b of low-pass filter LPF3, voltage follower IC20.
8. DC current sensor according to claim 7, its characteristic is: computing machine (2) comprises multi-channel A/D capture card IC27 and single-chip microcomputer IC28, the output terminal c of the output terminal b of voltage follower IC20, the output terminal a of voltage follower IC21, voltage follower IC22 meets multi-channel A/D capture card IC27 respectively by controllable gain amplifier IC26, and the output terminal g of single-chip microcomputer IC28 connects the input end of display 1.
9. DC current sensor according to claim 1, its characteristic is: go up coiling direct current winding W at ring-shaped core (3)
1, the tested dc wire of its two termination.
10. DC current sensor according to claim 1, its characteristic is: this sensor is made the sensor of clamp type structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100131733A CN100394199C (en) | 2004-05-18 | 2004-05-18 | Direct current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100131733A CN100394199C (en) | 2004-05-18 | 2004-05-18 | Direct current sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1580788A true CN1580788A (en) | 2005-02-16 |
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| CN100365419C (en) * | 2006-01-17 | 2008-01-30 | 王清波 | Non-contact measuring system for direct current |
| CN101706526A (en) * | 2009-11-06 | 2010-05-12 | 徐先 | Measuring method and device of pulse width detection type magnetic modulation direct current |
| CN101813723A (en) * | 2010-04-07 | 2010-08-25 | 中环光伏系统有限公司 | Non-contact type direct current measuring method |
| CN101900754A (en) * | 2009-05-27 | 2010-12-01 | 新科实业有限公司 | Current sensor |
| CN101571557B (en) * | 2009-06-09 | 2010-12-08 | 华中科技大学 | DC high-current metering device |
| CN103091532A (en) * | 2011-10-28 | 2013-05-08 | 上海汽车集团股份有限公司 | Electric current transducer used for automobile and based on zero magnetic flux compensation |
| CN103616550A (en) * | 2013-11-29 | 2014-03-05 | 河北工业大学 | Giant magnetoresistance current sensor |
| CN103760405A (en) * | 2014-01-28 | 2014-04-30 | 张正纲 | Device measuring direct current |
| CN105448453A (en) * | 2016-01-13 | 2016-03-30 | 华中科技大学 | Rogowski coil based on coaxial cable framework |
| CN105866505A (en) * | 2016-03-24 | 2016-08-17 | 中国科学院上海应用物理研究所 | Magnetic core selection method for AC/DC current sensor |
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| EP0264612B1 (en) * | 1986-09-22 | 1991-12-11 | Siemens Aktiengesellschaft | Current sensor and method for registering the current flux in analysing conductors |
| GB8805245D0 (en) * | 1988-03-04 | 1988-04-07 | Cambridge Consultants | Active current transformer |
| JPH03218475A (en) * | 1989-11-06 | 1991-09-26 | Nkk Corp | Method and device for measuring current |
| JP3286431B2 (en) * | 1993-10-12 | 2002-05-27 | 住友特殊金属株式会社 | DC current sensor |
| JP3286446B2 (en) * | 1993-12-29 | 2002-05-27 | 住友特殊金属株式会社 | DC current sensor |
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| CN101900754B (en) * | 2009-05-27 | 2013-10-30 | 新科实业有限公司 | Current sensor |
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| CN101571557B (en) * | 2009-06-09 | 2010-12-08 | 华中科技大学 | DC high-current metering device |
| CN101706526A (en) * | 2009-11-06 | 2010-05-12 | 徐先 | Measuring method and device of pulse width detection type magnetic modulation direct current |
| CN101813723A (en) * | 2010-04-07 | 2010-08-25 | 中环光伏系统有限公司 | Non-contact type direct current measuring method |
| CN103091532A (en) * | 2011-10-28 | 2013-05-08 | 上海汽车集团股份有限公司 | Electric current transducer used for automobile and based on zero magnetic flux compensation |
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| CN105866505B (en) * | 2016-03-24 | 2018-06-19 | 中国科学院上海应用物理研究所 | A kind of magnetic core selection method of alterating and direct current flow sensor |
| CN108732403B (en) * | 2017-04-24 | 2020-10-20 | 航天科工深圳（集团）有限公司 | Current sensor and magnetic flux balancing circuit thereof |
| CN108732404B (en) * | 2017-04-24 | 2020-10-20 | 航天科工深圳（集团）有限公司 | Current sensor and multi-flux balance control circuit thereof |
| CN108732403A (en) * | 2017-04-24 | 2018-11-02 | 航天科工深圳（集团）有限公司 | A kind of current sensor and its balance of flux circuit |
| CN108732404A (en) * | 2017-04-24 | 2018-11-02 | 航天科工深圳（集团）有限公司 | A kind of current sensor and its more balance of flux control circuits |
| CN107085131A (en) * | 2017-04-27 | 2017-08-22 | 东莞中子科学中心 | A kind of slow current measuring instrument of non-intrusion type and preparation method thereof |
| CN107085131B (en) * | 2017-04-27 | 2019-05-28 | 东莞中子科学中心 | A kind of slow current measuring instrument of non-intrusion type and preparation method thereof |
| CN107102187A (en) * | 2017-05-09 | 2017-08-29 | 中国电力科学研究院 | A kind of Zero flux fluxgate current sensor for alternating current-direct current Super-Current Measurement |
| CN107102187B (en) * | 2017-05-09 | 2020-09-25 | 中国电力科学研究院 | Zero-flux fluxgate current sensor for measuring alternating current and direct current heavy current |
| CN107817372B (en) * | 2017-12-14 | 2023-10-27 | 华中科技大学 | Direct current and alternating current heavy current sensing head and metering device |
| CN107817372A (en) * | 2017-12-14 | 2018-03-20 | 华中科技大学 | A kind of direct current and AC great current sensing head and metering device |
| CN108132375A (en) * | 2017-12-25 | 2018-06-08 | 天津百利机械装备集团有限公司中央研究院 | A kind of direct current measuring devices and measuring method of band feedforward |
| CN108132375B (en) * | 2017-12-25 | 2020-03-27 | 天津百利机械装备集团有限公司中央研究院 | Direct current measuring device with feedforward and measuring method |
| CN108333552A (en) * | 2018-04-08 | 2018-07-27 | 江阴市星火电子科技有限公司 | A kind of mutual inductor end detecting device of the same name |
| CN108333552B (en) * | 2018-04-08 | 2024-04-19 | 江阴市星火电子科技有限公司 | Mutual inductor homonymous end detection device |
| CN112424618A (en) * | 2018-07-17 | 2021-02-26 | 日置电机株式会社 | Current sensor |
| CN109709369A (en) * | 2019-03-06 | 2019-05-03 | 宁波泰丰源电气有限公司 | A kind of electric energy meter electronic mutual inductor |
| CN111693753A (en) * | 2019-11-29 | 2020-09-22 | 中国计量大学 | Novel direct current measuring device |
| 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 |
| CN111398650B (en) * | 2020-06-04 | 2020-10-09 | 华中科技大学 | Quick response direct current comparator based on multisensor fuses |
| WO2021243989A1 (en) * | 2020-06-04 | 2021-12-09 | 华中科技大学 | Fast-response direct-current comparator based on multi-sensor fusion |
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| CN111721983A (en) * | 2020-06-23 | 2020-09-29 | 广东电网有限责任公司 | Current measurement clamp meter |
| CN111701871A (en) * | 2020-06-23 | 2020-09-25 | 中国科学院上海高等研究院 | Magnetic core selection device and method for magnetic balance direct current sensor |
| WO2022037099A1 (en) * | 2020-08-18 | 2022-02-24 | 宁波中车时代传感技术有限公司 | Low-cost current sensor |
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