CN108562778A - A kind of open type current sensor and its control method - Google Patents
A kind of open type current sensor and its control method Download PDFInfo
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- CN108562778A CN108562778A CN201810644598.6A CN201810644598A CN108562778A CN 108562778 A CN108562778 A CN 108562778A CN 201810644598 A CN201810644598 A CN 201810644598A CN 108562778 A CN108562778 A CN 108562778A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/207—Constructional details independent of the type of device used
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/186—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using current transformers with a core consisting of two or more parts, e.g. clamp-on type
Abstract
The invention discloses a kind of open type current sensor and its control methods, including closed loop control module and excitatory module, the excitatory module includes excitatory oscillator, the excitatory unit being connect with excitatory oscillator and the D.C. magnetic biasing detection unit being connect with excitatory unit, the excitatory module uses Fluxgate Technique, and D.C. magnetic biasing signal is exported by magnetic modulation technique；The excitatory oscillator exports the alternating voltage signal of predeterminated frequency to the excitatory unit, to encourage the excitatory unit to generate target excitation magnetic field, the target excitation magnetic field is used to be detected the DC bias magnetic field that the electric current to be measured in circuit under test generates, and D.C. magnetic biasing signal corresponding with the DC bias magnetic field is exported by the D.C. magnetic biasing detection unit, the closed loop control module is connect with the D.C. magnetic biasing detection unit.The present invention realizes the Precision measurement to alternating current and DC current, improves the current detection accuracy of open type current sensor.
Description
Technical field
The present invention relates to current detection technology field more particularly to a kind of open type current sensor and its control methods.
Background technology
Current sensor is a kind of energy perception electric current to be measured, the small electricity that high current or micro-current are converted into being easy to measure
Stream, voltage signal and the sensor that output analog signal or digital signal are isolated.
According to different application scenarios demands, current sensor has closed type current sensor and open type current sense
Device.Closed type current sensor measurement precision is high, but installs inconvenience；Open type current sensor can be installed with hot line job
It is convenient, but precision is not high.Currently, open type current sensor in the market mainly has Hall current sensor and sieve Koffsky
Coil.Hall sensor can measure direct current and alternating current, but since drift and temperature drift are bigger, cannot achieve high-precision and survey
Amount.Rogowski coil installation is simple, and measurement range is wide, but can only measure exchange, inadequate for low-frequency current signal
Sensitivity, it is more demanding to post processing electric circuit.
Invention content
The technical issues of based on cannot achieve high-acruracy survey existing for background technology, the present invention propose a kind of open type
Current sensor and its control method.
A kind of open type current sensor proposed by the present invention, including closed loop control module and excitatory module, it is described excitatory
Module includes excitatory oscillator, the excitatory unit being connect with excitatory oscillator and the D.C. magnetic biasing being connect with excitatory unit detection
Unit, the excitatory module use Fluxgate Technique, and D.C. magnetic biasing signal is exported by magnetic modulation technique；The excitatory oscillator
The alternating voltage signal that predeterminated frequency is exported to the excitatory unit, to encourage the excitatory unit to generate target excitation magnetic field,
The target excitation magnetic field is used to be detected the DC bias magnetic field that the electric current to be measured in circuit under test generates, and passes through institute
State D.C. magnetic biasing detection unit and export corresponding with DC bias magnetic field D.C. magnetic biasing signal, the closed loop control module and
The D.C. magnetic biasing detection unit connection.
Preferably, the excitatory unit include the first field winding N1, the second field winding N2, the first field core T1 and
Second field core T2, the first field core T1 and the second field core T2 consists of two parts respectively, and first part swashs
There is opening air gap between magnetic core and second part field core；First field winding N1 and the second field winding N2 are twined respectively
Around the first field core T1 and the second field core T2；The excitatory oscillator is excitatory to the first field winding N1 and second simultaneously
Winding N2 exports the alternating voltage signal of predeterminated frequency, the electricity on voltage and the second field winding N2 on the first field winding N1
Press signal magnitude equal, direction is opposite.
Preferably, the closed loop control module includes D.C. magnetic biasing signal processing unit, exchange flux detection unit, hands over directly
Flux compensation unit and current detecting unit are flowed, input terminal and the D.C. magnetic biasing of the D.C. magnetic biasing signal processing unit are examined
Survey unit connection, the first input of the output end of the D.C. magnetic biasing signal processing unit and the alternating current-direct current flux compensation unit
End connection, the output end of the exchange flux detection unit are connect with the second input terminal of the alternating current-direct current flux compensation unit,
The output end of the alternating current-direct current flux compensation unit is connect with the current detecting unit.
Preferably, the exchange flux detection unit includes exchange flux detection winding N3, exchange flux detection iron core T3
And exchange flux signal processing unit, exchange flux detection iron core T3 consist of two parts, first part detect iron core with
There is opening air gap between detecting iron core in second part.
Preferably, the D.C. magnetic biasing signal processing unit includes that first voltage processing unit and the amplification of the first signal are single
Member, the input terminal of the first voltage processing unit are the input terminal of the D.C. magnetic biasing signal processing unit, first electricity
Pressure processing unit output end connect with the input terminal of first signal amplification unit, first signal amplification unit it is defeated
Outlet is the output end of the D.C. magnetic biasing signal processing unit.
Preferably, the alternating current-direct current flux compensation unit includes power amplification unit and proportional compensation winding N6, the work(
The first input end of rate amplifying unit and the second input terminal are respectively the first input end and second of alternating current-direct current flux compensation unit
The output end of input terminal, power amplification unit is connect with the Same Name of Ends of proportional compensation winding N6, the proportional compensation winding N6's
Different name end is the output end of alternating current-direct current flux compensation unit, the simultaneously wound first field core T1 of the proportional compensation winding N6 and
Second field core T2 and exchange flux detection iron core T3.
The invention also provides a kind of control method of open type current sensor, control method uses Zero flux closed loop
Control technology, the alternating current magnetic field that the closed loop control module generates the electric current to be measured be detected, and according to detecting
Exchange flux signal generates exchange flux thermal compensation signal；The closed loop control module generates straight also according to the D.C. magnetic biasing signal
Magnetic bias thermal compensation signal is flowed, and target alternating current-direct current is generated according to the exchange flux thermal compensation signal and the D.C. magnetic biasing thermal compensation signal
Field compensation signal, and alternating current-direct current benefit is generated around the circuit under test according to the target alternating current-direct current field compensation signal
Magnetic field is repaid, alternating current-direct current compensation magnetic field is overlapped mutually with the DC bias magnetic field and the alternating current magnetic field, the friendship after superposition
It is zero that DC stacked magnetic field, which passes through the magnetic flux of the plane vertical with its magnetic induction line,.
The beneficial effects of the invention are as follows：By using Fluxgate Technique in open type current sensor, modulated by magnetic
Technology export D.C. magnetic biasing signal, and Zero flux Closed loop Control is used in closed loop control module, according to the exchange detected
Magnetic flux signal and the D.C. magnetic biasing signal generation alternating current-direct current of excitatory module output compensate magnetic field, and alternating current-direct current compensates magnetic field and across biography
It hangs down across with its magnetic induction line in alternating current-direct current superposition magnetic field after D.C. magnetic field and alternating current magnetic field caused by sensor electric current are overlapped mutually
The magnetic flux of straight plane is zero, to realize the Precision measurement to alternating current and DC current, improves open type electricity
The current detection accuracy of flow sensor.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of open type current sensor proposed by the present invention；
Fig. 2 is a kind of open type current sensor proposed by the present invention and its control circuit block diagram of control method；
Fig. 3 is a kind of open type current sensor proposed by the present invention and its control circuit exploded view of control method；
Fig. 4 is a kind of open type current sensor proposed by the present invention and its control circuit concrete structure of control method
Figure.
In figure：1 closed loop control module, 2 excitatory modules, 10 D.C. magnetic biasing signal processing units, the detection of 11 exchange flux are single
Member, the detection of 12 alternating current-direct current flux compensation units, 13 current detecting units, 21 excitatory oscillators, 22 excitatory units, 23 D.C. magnetic biasings
Unit, 101 first voltage processing units, 102 first signal amplification units, 121 power amplification units.
Specific implementation mode
The present invention is made further to explain with reference to specific embodiment.
Embodiment
Referring to Fig.1, a kind of open type current sensor 100 in structure by 2 groups of closed loop control module 1 and excitatory module
At.Excitatory module 2 by the first field core T1, the second field core T2, the first field winding N1, the second field winding N2 and
Exciting circuit forms.Wherein, the first field core T1 and the second field core T2 is respectively by T11, T12 and T21, T22 two parts
There is opening air gap D between T11 and T12 and between T21 and T22 in composition；N2 points of first field winding N1 and the second field winding
The first field core second part T11 and the second field core second part T21 are not wound.
Closed loop control module 1 is by exchange flux detection iron core T3, exchange flux detection winding N3 and closed control circuit group
At.Wherein, exchange flux detection iron core T3 consists of two parts, first part exchange flux detection iron core T31 and second part
There is opening air gap D, the N3 winding second part exchange flux inspections of exchange flux detection winding between detecting iron core T32 in exchange flux
Survey iron core T31.
Electric current to be measured is Id in external circuit under test, and the conducting wire by carrying electric current Id to be measured flows through current sensor, carries
The conducting wire of electric current Id to be measured passes through among tri- iron cores of T1, T2, T3.Wherein, Nd is used to illustrate to carry leading for electric current Id to be measured
The corresponding winding of line, Wd are the number of turns of the corresponding winding of conducting wire, and it is 1 circle usually to take Wd.
Since Fig. 1 is only the structure for showing a kind of open type current sensor 100, the closed loop control in closed loop control module 1
Not described in detail herein, physical circuit design please refers to Fig.2 exciting circuit in circuit processed and excitatory module 2, Fig. 3 and Fig. 4.
It is a kind of open type current sensor provided in an embodiment of the present invention and its control electricity of control method referring to Fig. 2
Road block diagram.For convenience of description, illustrate only with the relevant part of the embodiment of the present invention, details are as follows：
A kind of closed-loop control 1 of open type current sensor 100, connect with the excitatory module 2 in current sensor 100,
For realizing the detection to DC current component and alternating current ingredient in electric current Id to be measured in circuit under test.
Wherein, Nd is used to illustrate to carry the corresponding winding of conducting wire of electric current Id to be measured, when electric current Id to be measured flows through conducting wire,
Generated magnetomotive force is Id × Wd on conducting wire.Wherein, Wd is the number of turns of the corresponding winding of conducting wire, and it is 1 circle usually to take Wd.
Specifically, excitatory module 2 include excitatory oscillator 21, the excitatory unit 22 that is connect with excitatory oscillator 21 and with
The D.C. magnetic biasing detection unit 23 that excitatory unit 22 connects.Excitatory oscillator 21 exports the alternation of predeterminated frequency to excitatory unit 22
Voltage signal, to encourage excitatory unit 22 to generate target excitation magnetic field, target excitation magnetic field is used for to be measured in circuit under test
The DC bias magnetic field that electric current Id is generated is detected, and passes through the output of D.C. magnetic biasing detection unit 22 and DC bias magnetic field pair
The D.C. magnetic biasing signal answered.
In embodiments of the present invention, alternating voltage signal can be square-wave signal, sine wave signal or triangular signal etc..
Preferably, square wave voltage signal is selected in the embodiment of the present invention.
In embodiments of the present invention, the frequency for the alternating voltage signal that excitatory oscillator 21 exports can be according to actual demand
It is configured, is not limited herein.
Excitatory unit 22 is excitatory including the first field winding N1, the second field winding N2, the first field core T1 and second
The Same Name of Ends of iron core T2, the different name end of the first field winding N1 and the second field winding N2 are connected to the output of excitatory oscillator 21 altogether
End.Excitatory oscillator 21 exports the alternating voltage letter of predeterminated frequency to the first field winding N1 and the second field winding N2 simultaneously
Number, the voltage on the first field winding N1 and the voltage signal on the second field winding N2 are equal in magnitude, and direction is opposite.First swashs
Magnetic winding N1 and the second field winding N2 generate target excitation magnetic field and balanced excitation respectively under the excitation of alternating voltage signal
Magnetic field, theoretically, target excitation magnetic field are equal in magnitude with balanced excitation magnetic field, and direction is on the contrary, balanced excitation magnetic field and target
Excitation field is overlapped, with offset target excitation magnetic field the plane vertical with its magnetic induction line magnetic flux so that excitatory list
First 22 external magnetic flux are zero.
D.C. magnetic biasing detection unit 23 can be D.C. magnetic biasing detection resistance R1, the first end of D.C. magnetic biasing detection resistance R1
It is connect with the Same Name of Ends of the first field winding N1, the second end ground connection of D.C. magnetic biasing detection resistance R1, D.C. magnetic biasing detection resistance
R1 exports D.C. magnetic biasing signal by its first end.First field core T1 and the second field core T2 is soft magnet core, when
Exporting the alternating voltage signal of predeterminated frequency to the first field winding N1 by excitatory oscillator 21 makes soft magnet core enter saturation
When state, the alternating flux of soft magnet core produces higher hamonic wave.When electric current Id to be measured is zero, the one of alternating voltage signal
In a period, the average voltage on D.C. magnetic biasing detection resistance R1 is zero；When electric current Id to be measured is not zero, the first field winding
N1 can be detected the electric current Id to be measured DC bias magnetic fields generated, so that in a cycle of alternating voltage signal
Interior, the average voltage of D.C. magnetic biasing detection resistance R1 is not zero, detected D.C. magnetic biasing on D.C. magnetic biasing detection resistance R1
The size and Orientation of signal (voltage signal) reflects the size and Orientation for the DC bias magnetic field that electric current Id to be measured is generated, in turn
The size and Orientation of electric current Id to be measured is reacted.
Closed-loop control 1 includes closed loop control module 1.Closed loop control module 1 is connect with D.C. magnetic biasing detection unit 23.
Closed loop control module 1 is detected the electric current Id to be measured alternating current magnetic fields generated, and according to the AC magnetism detected
Messenger generates exchange flux thermal compensation signal；The direct current that closed loop control module 1 is exported also according to D.C. magnetic biasing detection unit 23 is inclined
Magnetic signal generates D.C. magnetic biasing thermal compensation signal, and generates target according to exchange flux thermal compensation signal and D.C. magnetic biasing thermal compensation signal and hand over
Direct current flux thermal compensation signal, and alternating current-direct current is generated around circuit under test according to target alternating current-direct current flux compensation signal and compensates magnetic
, alternating current-direct current compensation magnetic field is overlapped mutually with DC bias magnetic field and alternating current magnetic field, and the alternating current-direct current superposition magnetic field after superposition passes through
The magnetic flux of the plane vertical with its magnetic induction line is zero, so realize in circuit under test Id DC current component with exchange
The detection of current component, improves the current detection accuracy of sensor, and sensor is made to realize broadband current detecting.
Specifically, exchange flux thermal compensation signal and D.C. magnetic biasing thermal compensation signal are overlapped by exchange flux balance module 1,
Obtain target alternating current-direct current flux compensation signal.
It is a kind of open type current sensor provided in an embodiment of the present invention and its control electricity of control method referring to Fig. 3
Road exploded view.For convenience of description, illustrate only with the relevant part of the embodiment of the present invention, details are as follows：
Wherein, I1、I2Electric current on respectively the first field winding N1, the second field winding N2, W1、W2Respectively first
The number of turns of field winding N1, the second field winding N2.
Closed loop control module 1 includes D.C. magnetic biasing signal processing unit 10, exchange flux detection unit 11, alternating current-direct current magnetic flux
Compensating unit 12 and current detecting unit 13.
The input terminal of D.C. magnetic biasing signal processing unit 10 is connect with D.C. magnetic biasing detection unit 22, at D.C. magnetic biasing signal
Reason unit 10 output end connect with the first input end of alternating current-direct current flux compensation unit 12, exchange flux detection unit 11 it is defeated
Outlet is connect with the second input terminal of alternating current-direct current flux compensation unit 12, the output end and electric current of alternating current-direct current flux compensation unit 12
Detection unit 13 connects.
The D.C. magnetic biasing signal that D.C. magnetic biasing signal processing unit 10 exports D.C. magnetic biasing detection unit 22 is handled,
And export D.C. magnetic biasing thermal compensation signal；Inclined side detection unit 11 is exchanged to be detected the electric current Id to be measured alternating current magnetic fields generated,
And exchange flux thermal compensation signal is exported according to the exchange flux signal detected；Alternating current-direct current flux compensation unit 12 is according to AC magnetism
Logical thermal compensation signal and D.C. magnetic biasing thermal compensation signal generate target alternating current-direct current flux compensation signal, and are mended according to target alternating current-direct current magnetic flux
It repays signal and generates alternating current-direct current compensation magnetic field around circuit under test, alternating current-direct current compensates magnetic field and DC bias magnetic field and AC magnetism
Field is overlapped mutually, and it is zero that the alternating current-direct current superposition magnetic field after superposition, which passes through the magnetic flux of the plane vertical with its magnetic induction line,.
Specifically, alternating current-direct current flux compensation unit 12 folds exchange flux thermal compensation signal and D.C. magnetic biasing thermal compensation signal
Add, obtains target alternating current-direct current flux compensation signal.
It is a kind of open type current sensor provided in an embodiment of the present invention and its control electricity of control method referring to Fig. 4
Road concrete structure diagram.For convenience of description, illustrate only with the relevant part of the embodiment of the present invention, details are as follows：
As an embodiment of the present invention, exchange flux detection unit 11 includes exchange flux detection winding N3, exchange flux
Detect iron core T3 and exchange flux signal processing unit 110.
The different name end of exchange flux detection winding N3 is grounded, and the Same Name of Ends of exchange flux detection winding N3 is communicated with AC magnetism
The output end of the input terminal connection of number processing unit 110, exchange flux signal processing unit 110 is exchange flux detection unit 11
Output end.
Exchange flux detection winding N3 is detected the electric current Id to be measured alternating current magnetic fields generated, and exports AC magnetism communication
Number；Exchange flux signal processing unit 110 handles exchange flux signal, and exports exchange flux thermal compensation signal.
As an embodiment of the present invention, exchange flux signal processing unit 110 includes second voltage processing unit 111 and the
Binary signal amplifying unit 11.
The input terminal of second voltage processing unit 111 is the input terminal of exchange flux signal processing unit 110, second voltage
The output end of processing unit 111 is connect with second signal amplifying unit 11, and the output end of second signal amplifying unit 11 is exchange
The output end of magnetic flux signal processing unit 110.
Second voltage processing unit 111 carries out rectification filter to the exchange flux signal that exchange flux detection winding N3 is detected
Wave etc. handles and exports second voltage signal, and second signal amplifying unit 11 is amplified processing to second voltage signal and exports
Exchange flux thermal compensation signal best friend's direct current flux compensating unit 12.
In practical applications, second voltage processing unit 111 can be current rectifying and wave filtering circuit, second signal amplifying unit 11
It can be amplifier, be specifically as follows proportional integration amplifier.
As an embodiment of the present invention, D.C. magnetic biasing signal processing unit 10 includes first voltage processing unit 101 and the
One signal amplification unit 102.
The input terminal of first voltage processing unit 101 is the input terminal of D.C. magnetic biasing signal processing unit 10, first voltage
The output end of processing unit 101 is connect with the input terminal of the first signal amplification unit 102, the first signal amplification unit 102 it is defeated
Outlet is the output end of D.C. magnetic biasing signal processing unit 10.
First voltage processing unit 101 carries out rectifying and wave-filtering to the D.C. magnetic biasing signal that D.C. magnetic biasing detection unit 22 exports
Deng processing and first voltage signal is exported, the first signal amplification unit 102 is amplified processing to first voltage signal and exports
D.C. magnetic biasing thermal compensation signal best friend's direct current flux compensating unit 12.
In practical applications, first voltage processing unit 101 can be current rectifying and wave filtering circuit, the first signal amplification unit
102 can be amplifier, be specifically as follows proportional integration amplifier.
As an embodiment of the present invention, current detecting unit 13 is current sense resistor RL；The of current sense resistor RL
One end is connect with the output end of alternating current-direct current flux compensation unit 12, the second end ground connection of current sense resistor RL.
As an embodiment of the present invention, alternating current-direct current flux compensation unit 12 includes power amplification unit 121 and proportional compensation
Winding N6.
The first input end of power amplification unit 121 and the second input terminal are respectively the of alternating current-direct current flux compensation unit 12
The output end of one input terminal and the second input terminal, power amplification unit 121 is connect with the Same Name of Ends of proportional compensation winding N6, ratio
The different name end of compensative winding N6 is the output end of alternating current-direct current flux compensation unit 12.Proportional compensation winding N6 simultaneously wound first swashs
Magnetic core T1 and the second field core T2 and exchange flux detection iron core T3.
Power amplification unit 121 is overlapped the exchange flux thermal compensation signal and D.C. magnetic biasing thermal compensation signal that receive,
And generate target alternating current-direct current flux compensation signal；Proportional compensation winding N6 is produced under the excitation of target alternating current-direct current flux compensation signal
Raw alternating current-direct current compensates magnetic field, and alternating current-direct current compensation magnetic field is overlapped mutually with DC bias magnetic field and alternating current magnetic field, and the friendship after superposition is straight
It is zero that stream superposition magnetic field, which passes through the magnetic flux of the plane vertical with its magnetic induction line,.The electric current I6 for flowing through proportional compensation winding N6 exists
The magnetomotive force I generated on proportional compensation winding N66×W6It is produced with the electric current Id to be measured of conducting wire is flowed through on the corresponding winding Nd of conducting wire
Raw magnetomotive force Id × Wd is equal in magnitude, and direction is on the contrary, i.e.-I6×W6=Id × Wd.Wherein, W6It is respectively proportional compensation with Wd
The number of turns of winding N6 and the corresponding winding Nd of conducting wire.Since the number of turns of the corresponding winding Nd of conducting wire is 1, proportional compensation winding N6 is
It is known, by the voltage for measuring the both ends current sense resistor RL, you can know the electric current I6 for flowing through proportional compensation winding N6, into
And it can be according to formula-I6×W6The size of electric current Id to be measured is calculated in=Id × Wd, realizes the high-precision to electric current to be measured
Detection.
In practical applications, power amplification unit 121 can be power amplifier, the in-phase input end of power amplifier and
Inverting input is respectively the first input end and the second input terminal of power amplification unit 121.
Specifically, in embodiments of the present invention, D.C. magnetic biasing detection unit 23, first voltage processing unit 101, first are believed
Number amplifying unit 102, power amplification unit 121 and proportional compensation winding N6 constitute D.C. magnetic biasing compensation circuit, for to be measured
The DC bias magnetic field that DC current in electric current Id generates compensates, and then realizes to the DC current in electric current Id to be measured
The detection of ingredient.Exchange flux detection winding N3, second voltage processing unit 111, second signal amplifying unit 11, power amplification
Unit 121 and proportional compensation winding N6 constitute exchange flux compensation circuit, for being generated to the alternating current in electric current Id to be measured
Alternating current magnetic field compensate, and then realize detection to the alternating component in electric current Id to be measured.
When electric current Id to be measured is not zero, direct current that D.C. magnetic biasing detection unit 23 is detected according to the first field winding N1
Bias magnetic field exports D.C. magnetic biasing signal, and first voltage processing unit 101 exports first after handling D.C. magnetic biasing signal
Voltage signal, the first signal amplification unit 102 are amplified processing to first voltage signal and export D.C. magnetic biasing thermal compensation signal
To power amplification unit 121, power amplification unit 121 exports target compensation electric current I6 according to D.C. magnetic biasing thermal compensation signal, to
Flow through the magnetomotive force I that the electric current I6 of proportional compensation winding N6 is generated on proportional compensation winding N66×W6With flow through waiting for for conducting wire
Survey magnetomotive force Id × Wd complete equipilibriums that electric current Id is generated on the corresponding winding Nd of conducting wire.Electric current Id to be measured is bigger, and power is put
The target compensation electric current I6 that big unit 121 exports is bigger, and electric current Id to be measured is smaller, the target that power amplification unit 121 exports
Electric current I6 is compensated with regard to smaller.In fact, since the gain of power amplification unit 121 is limited, and there are null offsets, and therefore, stream
The magnetomotive force I that electric current I6 through proportional compensation winding N6 is generated on proportional compensation winding N66×W6With the electricity to be measured for flowing through conducting wire
Magnetomotive force Id × Wd for being generated on the corresponding winding Nd of conducting wire of stream Id can not possibly complete equipilibrium, in order to maintain between the two flat
Weighing apparatus, need to form a degeneration factor, and the purpose, the magnetic on proportional compensation winding N6 may be implemented in exchange flux compensation circuit
As long as the magnetomotive force in kinetic potential and wire winding Nd is uneven, detection voltage will be formed on exchange flux detection winding N3,
The detection voltage is after the processing of second signal processing unit 110, input power amplifying unit 121, so that power amplification list
The target compensation electric current I6 of 121 output of member generates variation, so that the magnetic that electric current I6 is generated on proportional compensation winding N6 is dynamic
Gesture I6×W6Reach equilibrium-like with magnetomotive force Id × Wd that the electric current Id to be measured of conducting wire is generated on the corresponding winding Nd of conducting wire is flowed through
State.As the magnetomotive force I that electric current I6 is generated on proportional compensation winding N66×W6With flow through the electric current Id to be measured of conducting wire in conducting wire pair
After the magnetomotive force Id × Wd generated on the winding Nd answered reaches equilibrium state, the exchange that is detected on exchange flux detection winding N3
The D.C. magnetic biasing signal that magnetic flux signal and D.C. magnetic biasing detection resistance R1 are detected is zero, so that sensor is externally realized
Zero flux.
The embodiment of the present invention additionally provides a kind of open type current sensor 100, including excitatory module 2, further includes above-mentioned
Closed-loop control 1 in embodiment.
It should be noted that the structure for the closed-loop control 1 that the open type current sensor 100 in the present embodiment is included and
Operation principle is identical with the structure of the closed-loop control 1 in above-described embodiment and operation principle, and the electric current in the present embodiment passes
The operation principle of sensor 100 specifically refers to the associated description in above-described embodiment, and details are not described herein again.
The embodiment of the present invention is exported by using Fluxgate Technique in open type current sensor by magnetic modulation technique
D.C. magnetic biasing signal, and Zero flux Closed loop Control is used in closed loop control module 1, according to the exchange flux signal detected
Alternating current-direct current is generated with the D.C. magnetic biasing signal that excitatory module 2 exports and compensates magnetic field, and alternating current-direct current compensates magnetic field and across sensor electricity
Alternating current-direct current superposition magnetic field after D.C. magnetic field and alternating current magnetic field caused by stream are overlapped mutually passes through vertical with its magnetic induction line put down
The magnetic flux in face is zero, to realize the Precision measurement to alternating current and DC current, improves open type current sense
The current detection accuracy of device.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of open type current sensor, including closed loop control module（1）With excitatory module（2）, which is characterized in that it is described to swash
Magnetic module（2）Including excitatory oscillator（21）And excitatory oscillator（21）The excitatory unit of connection（22）And with excitatory unit
（22）The D.C. magnetic biasing detection unit of connection（23）, the excitatory module（2）It is defeated by magnetic modulation technique using Fluxgate Technique
Go out D.C. magnetic biasing signal；The excitatory oscillator（21）To the excitatory unit（22）Export the alternating voltage letter of predeterminated frequency
Number, to encourage the excitatory unit（22）Target excitation magnetic field is generated, the target excitation magnetic field is used for in circuit under test
The DC bias magnetic field that electric current to be measured generates is detected, and passes through the D.C. magnetic biasing detection unit（23）It exports and described straight
Flow the corresponding D.C. magnetic biasing signal of bias magnetic field, the closed loop control module（1）With the D.C. magnetic biasing detection unit（23）Even
It connects.
2. a kind of open type current sensor according to claim 1, which is characterized in that the excitatory unit（22）Including
First field winding N1, the second field winding N2, the first field core T1 and the second field core T2, first field core
T1 and the second field core T2 consist of two parts respectively, exist between first part's field core and second part field core
Be open air gap；First field winding N1 and the second field winding N2 wind the first field core T1 and the second field core respectively
T2；The excitatory oscillator（21）The alternation electricity of predeterminated frequency is exported to the first field winding N1 and the second field winding N2 simultaneously
Signal is pressed, the voltage on the first field winding N1 and the voltage signal on the second field winding N2 are equal in magnitude, and direction is opposite.
3. a kind of open type current sensor according to claim 1, which is characterized in that the closed loop control module（1）
Including D.C. magnetic biasing signal processing unit（10）, exchange flux detection unit（11）, alternating current-direct current flux compensation unit（12）And electricity
Flow detection unit（13）, the D.C. magnetic biasing signal processing unit（10）Input terminal and the D.C. magnetic biasing detection unit（23）
Connection, the D.C. magnetic biasing signal processing unit（10）Output end and the alternating current-direct current flux compensation unit（12）It is first defeated
Enter end connection, the exchange flux detection unit（11）Output end and the alternating current-direct current flux compensation unit（12）It is second defeated
Enter end connection, the alternating current-direct current flux compensation unit（12）Output end and the current detecting unit（13）Connection.
4. a kind of open type current sensor according to claim 3, which is characterized in that the exchange flux detection unit
（11）Including exchange flux detection winding N3, exchange flux detection iron core T3 and exchange flux signal processing unit（110）, described
Exchange flux detection iron core T3 consists of two parts, and first part, which is detected between iron core and second part detection iron core, has opening
Air gap.
5. a kind of open type current sensor according to claim 3, which is characterized in that the D.C. magnetic biasing signal processing
Unit（10）Including first voltage processing unit（101）With the first signal amplification unit（102）, the first voltage processing unit
（101）Input terminal be the D.C. magnetic biasing signal processing unit（10）Input terminal, the first voltage processing unit（101）
Output end and first signal amplification unit（102）Input terminal connection, first signal amplification unit（102）It is defeated
Outlet is the D.C. magnetic biasing signal processing unit（10）Output end.
6. a kind of open type current sensor according to claim 2 or 4, which is characterized in that the alternating current-direct current magnetic flux is mended
Repay unit（12）Including power amplification unit（121）With proportional compensation winding N6, the power amplification unit（121）It is first defeated
It is respectively alternating current-direct current flux compensation unit to enter end and the second input terminal（12）First input end and the second input terminal, power amplification
Unit（121）Output end connect with the Same Name of Ends of proportional compensation winding N6, the different name end of the proportional compensation winding N6 is to hand over
Direct current flux compensating unit（12）Output end, the simultaneously wound first field core T1 and second of proportional compensation winding N6 swash
Magnetic core T2 and exchange flux detection iron core T3.
7. according to a kind of control method of open type current sensor of claim 1-6 any one of them, which is characterized in that its
Control method uses Zero flux Closed loop Control, the closed loop control module（1）The AC magnetism that the electric current to be measured is generated
Field is detected, and generates exchange flux thermal compensation signal according to the exchange flux signal detected；The closed loop control module（1）
D.C. magnetic biasing thermal compensation signal is generated also according to the D.C. magnetic biasing signal, and according to the exchange flux thermal compensation signal and described straight
It flows magnetic bias thermal compensation signal and generates target alternating current-direct current field compensation signal, and according to the target alternating current-direct current field compensation signal in institute
It states and generates alternating current-direct current compensation magnetic field around circuit under test, alternating current-direct current compensation magnetic field and the DC bias magnetic field and described
Alternating current magnetic field is overlapped mutually, and it is zero that the alternating current-direct current superposition magnetic field after superposition, which passes through the magnetic flux of the plane vertical with its magnetic induction line,.
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| CN111693753A (en) * | 2019-11-29 | 2020-09-22 | 中国计量大学 | Novel direct current measuring device |
| CN112230043A (en) * | 2020-10-10 | 2021-01-15 | 浙江巨磁智能技术有限公司 | Method for separating alternating current from direct current by utilizing magnetic balance principle |
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