CN209640401U - The excitation closed control circuit of fluxgate current sensor - Google Patents
The excitation closed control circuit of fluxgate current sensor Download PDFInfo
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- CN209640401U CN209640401U CN201820373225.5U CN201820373225U CN209640401U CN 209640401 U CN209640401 U CN 209640401U CN 201820373225 U CN201820373225 U CN 201820373225U CN 209640401 U CN209640401 U CN 209640401U
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Abstract
A kind of excitation closed control circuit of fluxgate current sensor, the circuit are used to compensate the excitatory magnetic field that the excitation generation unit in the fluxgate current sensor generates, including excitation detection module, signal processing module and excitation compensating module；When current sensor detects the electric current in circuit under test, excitation detection module detects excitatory magnetic field, and generates echo signal according to excitatory magnetic field and be sent to signal processing module；Signal processing module generates excitation according to echo signal and compensates magnetic field excitation signal, signal processing module is sent to excitation compensating module for magnetic field excitation signal is compensated, and then it triggers excitation compensating module and generates compensation magnetic field around excitation generation unit, compensation magnetic field is overlapped mutually with excitatory magnetic field, and then is formed the excitation that magnetic flux is 0 in magnetic induction line vertical direction unit area and be superimposed magnetic field.The anti-interference ability for improving current sensor reduces the production cost of current sensor.
Description
Technical field
The utility model belongs to the excitation closed-loop control of electronic technology field more particularly to a kind of fluxgate current sensor
Circuit.
Background technique
Fluxgate current sensor is a kind of device for DC current information in Precision measurement circuit under test, extensive
Applied to numerous areas such as electric power, electronics, inverter, Switching Power Supply, ac variable frequency speed regulation and aerospaces.Magnetic modulation electricity
Flow sensor carries out accurate conversion to D.C. high-current or micro-current, obtains the current signal for being easy measurement accordingly or voltage letter
Number.
Existing fluxgate current sensor is realized by the corresponding relationship between detection magnetic field and DC current to be measured
When DC current in circuit is detected, excitation generation unit itself cannot achieve Zero flux, and there are interference electromagnetic fields.Although
Increase magnet shielding structure between the module that can lead to inside current sensor in the prior art to shield interference electromagnetic field, but due to
The design of shielding construction is excessively complicated, and needs to increase shielding iron core and its external structure realization, leads to fluxgate current sense
The production cost of device is excessively high.
Utility model content
For above-mentioned one kind there are problem, provided purpose of the utility model is to solve above-mentioned technical deficiency
The excitation closed control circuit of fluxgate current sensor.To achieve the above objectives, the present invention adopts the following technical solutions:
A kind of excitation closed control circuit of fluxgate current sensor, including excitation module, excitation closed-loop control system,
Ratio winding module, magnetic modulation circuit；The excitation module includes excitation oscillator, excitation generation unit；The excitation closed loop
Control system includes excitation detection module, signal processing module, excitation compensating module；The excitation oscillator and excitation generate single
Member is connected；Magnetic modulation circuit one end is connect with the excitation generation unit, the other end of the magnetic modulation circuit and institute
State the connection of ratio winding module；Winding in the excitation detection module is wrapped on the winding in the excitation compensating module,
The winding in the detection module is wrapped on the winding in the excitation generation unit simultaneously；Described signal processing module one end
It is connect with the excitation detection module, the other end of the signal processing module is connect with the excitation compensating module.
Wherein, the excitation generation unit includes field winding, field core, DC bias magnetic field detection resistance；It is described
Excitation swashs winding and is wrapped on the field core；The output end of the different name end of the field winding and the excitation oscillator connects
It connects, the Same Name of Ends of the field winding is connect with one end of the DC bias magnetic field detection resistance；The DC bias magnetic field
The other end of detection resistance is grounded.
Wherein, the ratio winding module includes ratio winding, proportion resistor；One end of the proportion resistor and the ratio
The Same Name of Ends connection of example winding, the other end ground connection of the proportion resistor；One end of the magnetic modulation circuit is connected to described sharp
Between magnetic winding and the DC bias magnetic field detection resistance, the other end of the magnetic modulation circuit and the ratio winding it is different
The connection of name end.
Wherein, the excitation detection module includes excitation detection winding and excitation detector；The excitation detection winding
Different name end ground connection, the Same Name of Ends of the excitation detection winding are connect with the excitation detector input terminal.
Wherein, signal processing module is amplifier, the amplifier first input end and the excitation detector output end
Connection, second input end grounding of amplifier.
Wherein, the excitation compensating module includes excitation compensation iron core and excitation compensative winding；The excitation compensative winding
Same Name of Ends connect with the output end of the amplifier, the different name end of excitation compensative winding ground connection, the excitation compensation around
Group is wrapped on magnetic compensation iron core.
Wherein, the amplifier is proportional integration amplifier, and the first input end of amplifier is proportional integration amplifier
Forward signal input terminal, the second input terminal of amplifier are the negative-going signal input terminal of proportional integration amplifier, and proportional integration is put
The output end of big device is the amplified signal output end of amplifier.
Wherein, the excitation detection winding is simultaneously wound on the field core and excitation compensation iron core.
The beneficial effects of the utility model are:
Compared with prior art, the excitation closed-loop control electricity of a kind of fluxgate current sensor provided by the utility model
Road, for compensating the excitatory magnetic field of the generation of the excitation generation unit in the fluxgate current sensor.Wherein, excitation closed loop control
Method processed includes: excitation detection module, signal processing module and excitation compensating module；When current sensor is in circuit under test
Electric current when being detected, excitation detection module detects excitatory magnetic field, and generates echo signal according to excitatory magnetic field and be sent to letter
Number processing module；Signal processing module generates excitation according to echo signal and compensates magnetic field excitation signal, and signal processing module will be mended
It repays magnetic field excitation signal and is sent to excitation compensating module, and then trigger excitation compensating module and generate benefit around excitation generation unit
Magnetic field is repaid, compensation magnetic field is overlapped mutually with excitatory magnetic field, and then forming magnetic flux in magnetic induction line vertical direction unit area is 0
It is superimposed magnetic field.The anti-interference ability of current sensor is enhanced, the detection accuracy of current sensor is improved, reduces electric current biography
The production cost of sensor.
Detailed description of the invention
Attached drawing 1 is the schematic illustration of the excitation closed control circuit of the utility model fluxgate current sensor；
Attached drawing 2 is the physical circuit figure of the utility model excitation closed-loop control system.
110, circuit under test 200, fluxgate current sensor
100, excitation closed-loop control system 10, excitation detection module
20, signal processing module 30, excitation compensating module
210, ratio winding module 220, magnetic modulation circuit
230, excitation module 231, excitation oscillator
232, excitation generation unit Id, electric current to be measured
Nd, circuit under test are equal to winding Na, field winding
R1, DC bias magnetic field detection resistance Nc, ratio winding
RL, proportion resistor Ic, ratio winding current
Ta, field core T2, excitation compensate iron core
N1, excitation detection winding+IN, forward signal input terminal
- IN, negative-going signal input terminal Q1, excitation detector.
Specific embodiment:
The utility model is described in further detail below with reference to Fig. 1, Fig. 2 and embodiment.
A kind of excitation closed control circuit of fluxgate current sensor of the utility model, including excitation module 230, excitation
Closed-loop control system 100, ratio winding module 210, magnetic modulation circuit 220；Excitation module 230 includes excitation oscillator 231, swashs
Magnetic generation unit 232；Excitation closed-loop control system 100 includes excitation detection module 10, signal processing module 20, excitation compensation mould
Block 30；Excitation oscillator 231 is connected with excitation generation unit 232；220 one end of magnetic modulation circuit and excitation generation unit 232
Connection, the other end and ratio winding module 210 connection of magnetic modulation circuit 220；Winding in excitation detection module 10 is wrapped in
Winding on winding in excitation compensating module 30, while in detection module is wrapped on the winding in excitation generation unit；Letter
Number 20 one end of processing module is connect with excitation detection module 10, and the other end and excitation compensating module 30 of signal processing module 20 connect
It connects；
When fluxgate current sensor 200 detects the electric current Id to be measured in circuit under test 110, excitation module 230
In excitation oscillator 231 to excitation generation unit 232 export fixed frequency square-wave signal, excitation generation unit 232 generate
Excitatory magnetic field, excitatory magnetic field incude the bias magnetic field that circuit under test 110 generates；232 biasings detected of excitation generation unit
Magnetic modulation circuit 220 is passed in magnetic field in the form of voltage signal；Magnetic modulation circuit 220 controls ratio according to the voltage signal of input
Winding module 210 generates compensation magnetic field around circuit under test 110；
Excitation detection module 10 in excitation closed-loop control system 100 detects excitatory magnetic field, and according to detection
The excitatory magnetic field arrived generates echo signal；Echo signal is sent to signal processing module 20 by excitation detection module 10；At signal
Reason module 20 will compensate magnetic field excitation signal and be sent to excitation compensating module 30, and then trigger excitation compensating module 30 in excitation mould
230 surrounding of block generates excitation and compensates magnetic field, and excitation compensation magnetic field is overlapped mutually with excitatory magnetic field, and then it is vertical to be formed in magnetic induction line
The superposition magnetic field that magnetic flux is 0 in the unit area of direction.
In this embodiment, excitation generation unit 232 includes field winding Na, field core Ta, DC bias magnetic field detection
Resistance R1；Excitation swashs winding and is wrapped on field core Ta；The different name end of field winding Na and the output end of excitation oscillator 231
Connection, the Same Name of Ends of field winding Na are connect with one end of DC bias magnetic field detection resistance R1；DC bias magnetic field detection electricity
Hinder the other end ground connection of R1；
Field winding Na receives the square-wave signal that excitation oscillator 231 issues and generates excitatory magnetic field；Excitatory magnetic field is used for
Incude the bias magnetic field that direct current generates in circuit under test 110；The bias magnetic field detected is with DC bias magnetic field detection resistance
The voltage form of R1 reflects；DC bias magnetic field detection resistance R1 provides DC bias magnetic field letter to magnetic modulation circuit 220
Number, DC bias magnetic field signal is voltage signal.
In the present embodiment, ratio winding module 210 includes ratio winding Nc, proportion resistor RL；The one of proportion resistor RL
End is connect with the Same Name of Ends of ratio winding Nc, the other end ground connection of proportion resistor RL；One end of magnetic modulation circuit 220 is connected to sharp
Between magnetic winding and DC bias magnetic field detection resistance R1, the other end of magnetic modulation circuit 220 and the different name end of ratio winding Nc
Connection；
Magnetic modulation circuit 220 is according to the DC bias magnetic field signal control ratio winding Nc received in circuit under test 110
Surrounding generates compensation magnetic field, and the magnetomotive force of ratio winding Nc is equal with the magnetomotive force in circuit under test 110.
Circuit under test is equal to winding Nd for illustrating circuit under test 110, i.e., it is 1 that circuit under test 110, which corresponds generally to the number of turns,
Circuit under test be equal to winding Nd, flow through the circuit under test be equal winding Nd electric current Id to be measured be Id i.e. Id × Wd=Ic × Wc,
Wherein, Wd is the number of turns that circuit under test is equal to winding, and Wc is the number of turns of ratio winding Nc, and Wc and Wd are known quantity, Ic ratio
Winding current is the electric current on the ratio winding Nc in ratio winding module 210, Ic can be obtained by measurement scale resistance RL
Numerical value.Therefore the electric current Id in circuit under test 110 can be obtained by relational expression Id × Wd=Ic × Wc.
In the present embodiment, excitation detection module 10 includes excitation detection winding N1 and excitation detector Q1；Excitation detection
The different name end of winding N1 is grounded, and the Same Name of Ends of excitation detection winding N1 is connect with excitation detector input terminal IN；
Excitation detection winding N1 generates excitatory magnetic field signal by detection excitatory magnetic field, and the excitatory magnetic field signal of generation
It is transmitted to excitation detector Q1, excitation detector Q1 generates echo signal according to excitatory magnetic field signal.
In the present embodiment, signal processing module 20 is amplifier, and amplifier first input end and excitation detector export
Hold OUT connection, the second input end grounding of amplifier；
Echo signal is passed to amplifier by amplifier first input end, and amplifier generates compensation after receiving echo signal
Magnetic field excitation signal.
In the present embodiment, excitation compensating module 30 includes excitation compensation iron core T2 and excitation compensative winding；Excitation compensation
The Same Name of Ends of winding and the output end of amplifier connect, and the different name end ground connection of excitation compensative winding, excitation compensative winding is wrapped in
On magnetic compensation iron core；
Compensation magnetic field excitation signal is sent to excitation compensative winding by the output end of amplifier；Excitation compensative winding is according to connecing
The compensation magnetic field excitation signal received and the generation excitation compensation magnetic field around excitation module 230；Excitation compensates magnetic magnetic field and swashs
Magnetic magnetic field is overlapped mutually, and the superposition magnetic field that magnetic flux is 0 in magnetic induction line vertical direction unit area is formed in after superposition.Excitation
The line of magnetic induction in magnetic field and the line of magnetic induction in excitation compensation magnetic field are parallel to each other, and the direction of excitatory magnetic field and excitation compensation magnetic field
Opposite size.The anti-interference ability of current sensor is enhanced, the detection accuracy of current sensor is improved.
In the present embodiment, amplifier is proportional integration amplifier, and the first input end of amplifier is proportional integration amplification
Forward signal input terminal+the IN of device, the second input terminal of amplifier are the negative-going signal input terminal-IN of proportional integration amplifier,
The output end OUT of proportional integration amplifier is the amplified signal output end of amplifier.
In the present embodiment, the simultaneously wound T2 on field core Ta and excitation compensation iron core of excitation detection winding N1.
In the present embodiment, the excitation closed loop control method of a kind of fluxgate current sensor, which is characterized in that including with
Lower synthesis step:
When S1, fluxgate current sensor detect the electric current Id to be measured in circuit under test 110, excitation module 230
In excitation oscillator 231 to excitation generation unit 232 export fixed frequency square-wave signal;
S2, excitation generation unit 232 generate excitatory magnetic field, and excitatory magnetic field incudes the bias magnetic field that circuit under test 110 generates；
232 bias magnetic fields detected of excitation generation unit pass to magnetic modulation circuit 220 in the form of voltage signal；
S3, magnetic modulation circuit 220 control ratio winding module 210 at circuit under test 110 weeks according to the voltage signal of input
Enclose generation compensation magnetic field；
Excitation detection module 10 in S4, excitation closed-loop control system 100 detects excitatory magnetic field, and according to inspection
The excitatory magnetic field measured generates echo signal；Echo signal is sent to signal processing module 20 by excitation detection module 10；
S5, signal processing module 20 generate compensation magnetic field excitation signal, and signal processing module 20 will compensate magnetic field excitation letter
Number it is sent to excitation compensating module 30；
S6 and then triggering excitation compensating module 30 generate excitation compensation magnetic field around excitation module 230, and excitation compensates magnetic
Field is overlapped mutually with excitatory magnetic field, and then is formed in the superposition magnetic field that magnetic flux is 0 in magnetic induction line vertical direction unit area.
Disclosed above is only several specific embodiments of the utility model, but the utility model is not limited to this,
The changes that any person skilled in the art can think of should all fall into the protection scope of the utility model.
Claims (8)
1. a kind of excitation closed control circuit of fluxgate current sensor, which is characterized in that including excitation module, excitation closed loop
Control system, ratio winding module, magnetic modulation circuit；The excitation module includes excitation oscillator, excitation generation unit；It is described
Excitation closed-loop control system includes excitation detection module, signal processing module, excitation compensating module；The excitation oscillator and swash
Magnetic generation unit is connected；Magnetic modulation circuit one end is connect with the excitation generation unit, the magnetic modulation circuit it is another
One end and the ratio winding module connect；Winding in the excitation detection module is wrapped in the excitation compensating module
On winding, while the winding in the detection module is wrapped on the winding in the excitation generation unit；The signal processing
Module one end is connect with the excitation detection module, and the other end of the signal processing module and the excitation compensating module connect
It connects.
2. the excitation closed control circuit of fluxgate current sensor according to claim 1, which is characterized in that described to swash
Magnetic generation unit includes field winding, field core, DC bias magnetic field detection resistance；The sharp winding of the excitation is wrapped in described
On field core；The different name end of the field winding is connect with the output end of the excitation oscillator, the field winding it is same
Name end is connect with one end of the DC bias magnetic field detection resistance；Another termination of the DC bias magnetic field detection resistance
Ground.
3. the excitation closed control circuit of fluxgate current sensor according to claim 2, which is characterized in that the ratio
Example winding module includes ratio winding, proportion resistor；The connection of the Same Name of Ends of one end of the proportion resistor and the ratio winding,
The other end of the proportion resistor is grounded；One end of the magnetic modulation circuit is connected to the field winding and the direct current biasing
Between magnetic field detection resistance, the different name end of the other end of the magnetic modulation circuit and the ratio winding is connected.
4. the excitation closed control circuit of fluxgate current sensor according to claim 2, which is characterized in that described to swash
Magnetic testi module includes excitation detection winding and excitation detector；The different name end of the excitation detection winding is grounded, the excitation
The Same Name of Ends of detection winding is connect with the excitation detector input terminal.
5. the excitation closed control circuit of fluxgate current sensor according to claim 4, which is characterized in that at signal
Reason module is amplifier, and the amplifier first input end is connect with the excitation detector output end, the amplifier second
Input end grounding.
6. the excitation closed control circuit of fluxgate current sensor according to claim 5, which is characterized in that described to swash
Magnetic compensation module includes excitation compensation iron core and excitation compensative winding；The Same Name of Ends and the amplifier of the excitation compensative winding
Output end connection, the different name end ground connection of the excitation compensative winding, the excitation compensative winding is wrapped on magnetic compensation iron core.
7. the excitation closed control circuit of fluxgate current sensor according to claim 5, which is characterized in that described to put
Big device is proportional integration amplifier, and the first input end of amplifier is the forward signal input terminal of proportional integration amplifier, amplification
Second input terminal of device is the negative-going signal input terminal of proportional integration amplifier, and the output end of proportional integration amplifier is amplifier
Amplified signal output end.
8. the excitation closed control circuit of fluxgate current sensor according to claim 4, which is characterized in that described to swash
Magnetic testi winding is simultaneously wound on the field core and excitation compensation iron core.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820373225.5U CN209640401U (en) | 2018-03-19 | 2018-03-19 | The excitation closed control circuit of fluxgate current sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820373225.5U CN209640401U (en) | 2018-03-19 | 2018-03-19 | The excitation closed control circuit of fluxgate current sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161296A (en) * | 2018-03-19 | 2019-08-23 | 深圳市航智精密电子有限公司 | The excitation closed control circuit and its control method of fluxgate current sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161296A (en) * | 2018-03-19 | 2019-08-23 | 深圳市航智精密电子有限公司 | The excitation closed control circuit and its control method of fluxgate current sensor |
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