CN104155499A - Current measuring device based on combined PCB type Rogowski coils and method thereof - Google Patents
Current measuring device based on combined PCB type Rogowski coils and method thereof Download PDFInfo
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- CN104155499A CN104155499A CN201410412028.6A CN201410412028A CN104155499A CN 104155499 A CN104155499 A CN 104155499A CN 201410412028 A CN201410412028 A CN 201410412028A CN 104155499 A CN104155499 A CN 104155499A
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Abstract
The invention relates to a current measuring device based on combined PCB type Rogowski coils and a method thereof. The device comprises one or more pairs of PCB type Rogowski coils, an amplifier circuit unit, an integral circuit unit and a sampling circuit unit. One or more pairs of PCB Rogowski coils orderly are connected in series. The directions of current flow in the winding wires of any two adjacent PCB Rogowski coils are opposite. Through holes in the PCB Rogowski coils pass through conductors with the conduction of current, and differential voltage signals are measured. The one or more pairs of PCB type Rogowski coils in series connection are electrically connected to the amplifier circuit unit. The amplifier circuit unit amplifies and outputs the differential voltage signals. The integral circuit unit integrates the amplified differential voltage signals to obtain reducing voltage signals which are proportional to the measured current in the conductors with the conduction of current. The sampling circuit unit samples the reducing voltage signals. The device and the method have the advantages of good parameter consistence and high reproducibility, and stability of a mutual inductance coefficient is ensured.
Description
Technical field
The present invention relates to a kind of current measuring device and method, relate in particular to a kind of current measuring device method based on combined type PCB type Luo-coil.
Background technology
Along with the raising of Operating Voltage; the raising of reliability requirement; the not only volume and weight increase of traditional electromagnetic transformer, explosion-proof isolation difficulty, security performance decline; and because the existence of iron core causes frequency band narrow; when measuring large electric current, iron core can be saturated, causes secondary singal waveform seriously to distort, and dynamic range is little; as the relay protection used time, reaction velocity lags behind and easily causes misoperation.These a series of shortcomings cause traditional electromagnetic transformer to be difficult to meet the requirement of power system development.And traditional electromagnetic transformer is subject to the restriction of principle of work and manufacture craft to be difficult to solve the problem that himself defect is brought, meet the demands so must develop the current sensor that is different from traditional electromagnetic transformer principle.Rogowski coil (hereinafter to be referred as Luo-coil) current transformer is as a kind of new-style electronic current transformer, there is the bandwidth of measurement, precision is high, measurement range is large, without magnetic saturation, be easy to the advantages such as digital output, volume are little, become one of important directions of modern current transformer development, in electric system, there is vast potential for future development.
But the traditional type Luo-coil measuring accuracy and the stability that drop at present application are not high, make trouble, and properties of product dispersiveness is larger, is unfavorable for large-scale industrial production, can't meet the requirement of current power system Construction.
Summary of the invention
The object of the present invention is to provide a kind of current measuring device and method based on combined type PCB type Luo-coil, traditional type Luo-coil measuring accuracy and stability are solved not high, make trouble, and properties of product dispersiveness is larger, is unfavorable for the problem of large-scale industrial production.
In order to address the above problem, the present invention relates to a kind of current measuring device based on combined type PCB type Luo-coil, the conductor of one On current is measured, comprised one or more pairs of PCB type Luo-coils, amplifier circuit unit, integrating circuit unit and sample circuit unit, wherein:
In described PCB type Luo-coil, include pcb board, interior bone and the coiling on pcb board, described one or more pairs of PCB type Luo-coil is all identical PCB type Luo-coils of number of turns, skeleton height, skeleton external diameter and skeleton internal diameter and interior bone internal diameter, spaced set is parallel to each other between the pcb board of two adjacent PCB type Luo-coils, and the circle center line connecting of the interior bone of all PCB type Luo-coils is at same straight line, and the interior bone of this straight line and described PCB type Luo-coil axially in the same way; Described one or more pairs of PCB Luo-coil is connected in series successively, and in the coiling of two PCB Luo-coils of arbitrary neighborhood, direction of current flow is contrary, is respectively clockwise direction and counter clockwise direction; The conductor that passes described On current in the interior bone of described one or more pairs of PCB Luo-coils, records differentiated voltage signal, one end ground connection of one or more pairs of PCB Luo-coils of described series connection;
The other end electrical connection amplifier circuit unit of one or more pairs of PCB Luo-coils of described series connection, described differentiated voltage signal is amplified output by described amplifier circuit unit;
Integrating circuit unit is electrically connected described amplifier circuit unit, by the differentiated voltage signal integration amplifying, obtains the recovery voltage signal of the interior tested electric current of conductor that is proportional to On current;
Sample circuit unit is electrically connected described integrating circuit unit, and described recovery voltage signal is sampled.
Preferably, also comprise a stationary installation, described one or more pairs of PCB Luo-coils are parallel to each other equidistantly fixing.
Preferably, described amplifier circuit unit is homophase input amplifying circuit, comprises the first integrated transporting discharging, the first resistance, the second resistance and the 3rd resistance; The signal output part of the described one or more pairs of PCB Luo-coils of one end electrical connection of described the first resistance, the other end is electrically connected the positive input of described the first integrated transporting discharging; One end ground connection of described the second resistance, the other end is electrically connected the reverse input end of described the first integrated transporting discharging; One end of described the 3rd resistance is electrically connected the output terminal of described the first integrated transporting discharging, and the other end is electrically connected the reverse input end of described the first integrated transporting discharging.
Preferably, described integrating circuit unit is an integral operation circuit, comprises the second integrated transporting discharging, the 4th resistance, the 5th resistance, the 6th resistance and the first electric capacity; One end of described the 4th resistance is electrically connected the output terminal of described the second integrated transporting discharging, and the other end is electrically connected the positive input of described the second integrated transporting discharging; One end of described the 5th resistance is electrically connected the output terminal of described the second integrated transporting discharging, and the other end is electrically connected the positive input of described the second integrated transporting discharging; Described the first electric capacity two ends are connected in parallel on the two ends of described the 5th resistance; One end of described the 6th resistance is electrically connected the reverse input end of described the second integrated transporting discharging, other end ground connection; The output terminal of described the second integrated transporting discharging connects described sample circuit unit.
Preferably, described the first integrated transporting discharging and the second integrated transporting discharging all adopt OP07CP.
To achieve these goals, the invention still further relates to a kind of current measuring method based on combined type PCB type Luo-coil, comprised the following steps:
By one or more pairs of number of turns, skeleton height, skeleton external diameter, skeleton internal diameter and interior bone internal diameter all identical PCB type Luo-coil be connected in series, make in the coiling of two PCB Luo-coils of arbitrary neighborhood direction of current flow contrary, be respectively clockwise direction and counterclockwise;
By a stationary installation, described PCB type Luo-coil is fixed, make to be parallel to each other equidistantly between the pcb board of two adjacent PCB type Luo-coils, the circle center line connecting of all PCB type Luo-coil interior bone is at same straight line, and the interior bone of this straight line and described PCB type Luo-coil axially in the same way;
Make the interior bone of a measured conductor through all PCB Luo-coils;
After measured conductor On current, the PCB type Luo-coil being electrically connected by series connection records a differentiated voltage signal;
The one or more pairs of PCB Luo-coils that are connected in series described in being electrically connected by amplifier circuit unit, amplify output by described differentiated voltage signal;
Be electrically connected described amplifier circuit unit by integrating circuit unit, by the differentiated voltage signal integration amplifying, obtain the recovery voltage signal of the interior tested electric current of conductor that is proportional to On current;
Be electrically connected described integrating circuit unit by sample circuit unit, described recovery voltage signal is sampled.
Preferably, described amplifier circuit unit is homophase input amplifying circuit, comprises the first integrated transporting discharging, the first resistance, the second resistance and the 3rd resistance; The signal output part of the described one or more pairs of PCB Luo-coils of one end electrical connection of described the first resistance, the other end is electrically connected the positive input of described the first integrated transporting discharging; One end ground connection of described the second resistance, the other end is electrically connected the reverse input end of described the first integrated transporting discharging; One end of described the 3rd resistance is electrically connected the output terminal of described the first integrated transporting discharging, and the other end is electrically connected the reverse input end of described the first integrated transporting discharging.
Preferably, described integrating circuit unit is an integral operation circuit, comprises the second integrated transporting discharging, the 4th resistance, the 5th resistance, the 6th resistance and the first electric capacity; One end of described the 4th resistance is electrically connected the output terminal of described the second integrated transporting discharging, and the other end is electrically connected the positive input of described the second integrated transporting discharging; One end of described the 5th resistance is electrically connected the output terminal of described the second integrated transporting discharging, and the other end is electrically connected the positive input of described the second integrated transporting discharging; Described the first electric capacity two ends are connected in parallel on the two ends of described the 5th resistance; One end of described the 6th resistance is electrically connected the reverse input end of described the second integrated transporting discharging, other end ground connection; The output terminal of described the second integrated transporting discharging connects described sample circuit unit.
Preferably, described the first integrated transporting discharging and the second integrated transporting discharging all adopt OP07CP.
The present invention, owing to adopting above technical scheme, compared with prior art, has following advantage and good effect:
The PCB type Luo-coil providing in the present invention, parameter consistency is good, and repdocutbility is high, ensures that coefficient of mutual inductance is stable, is easy to large-scale production and makes.And antijamming capability is strong, the bandwidth of current measurement, can meet accuracy and the reliability requirement of electric system to current measurement, and production cost is low simultaneously, can meet accuracy and the reliability requirement of electric system to current measurement.
Brief description of the drawings
Fig. 1 is the block diagram of a kind of current measuring device based on combined type PCB type Luo-coil of the present invention;
Fig. 2 is the connection diagram of any two PCB type Luo-coils in the embodiment of the present invention;
Fig. 3 is the circuit structure diagram of amplifier circuit unit in the embodiment of the present invention;
Fig. 4 is the circuit structure diagram of integrating circuit unit in the embodiment of the present invention;
Fig. 5 is the circuit theory diagrams of the one or more pairs of PCB Luo-coils of the present invention;
Fig. 6 is the process flow diagram of a kind of current measuring method based on combined type PCB type Luo-coil in the embodiment of the present invention.
Embodiment
Below with reference to accompanying drawing of the present invention; technical scheme in the embodiment of the present invention is carried out to clear, complete description; obviously; as described herein is only a part of example of the present invention; it is not whole examples; based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, belongs to protection scope of the present invention.
For the ease of the understanding to the embodiment of the present invention, be further explained as an example of specific embodiment example below in conjunction with accompanying drawing, and each embodiment does not form the restriction to the embodiment of the present invention.
A kind of current measuring device based on combined type PCB type Luo-coil as shown in accompanying drawing 1-5, measures the conductor of an On current, comprises one or more pairs of PCB type Luo-coils, amplifier circuit unit, integrating circuit unit and sample circuit unit, wherein:
In PCB type Luo-coil, include pcb board, interior bone and the coiling on pcb board.The coefficient of mutual inductance of coil is directly proportional to number of turns, skeleton height, skeleton external diameter and skeleton internal diameter, and one or more pairs of PCB type Luo-coils are all identical PCB type Luo-coils of number of turns, skeleton height, skeleton external diameter, skeleton internal diameter and interior bone internal diameter r.
In the present embodiment, adopt 2 pairs of PCB type Luo-coils, the skeleton height of PCB type Luo-coil is the thickness of pcb board, and except very requiring, general thickness of slab is no more than 3.2mm conventionally, considers that comprehensive factor of production 2mm is proper.
The spaced set that is parallel to each other between the pcb board of two adjacent PCB type Luo-coils, and the circle center line connecting of the interior bone of all PCB type Luo-coils is at same straight line, and the interior bone of this straight line and described PCB type Luo-coil axially in the same way.One or more pairs of PCB Luo-coils are connected in series successively, and in the coiling of two PCB Luo-coils of arbitrary neighborhood, direction of current flow is contrary, are respectively clockwise direction and counter clockwise direction.According to the law of electromagnetic induction, even if there is external magnetic field to exist, its on two adjacent coils to respond to formation voltage size identical, but both opposite directions, therefore the impact of external magnetic field has not just existed altogether, both have offseted, but just in time direction is identical for the voltage inducing because of the magnetic field of tested electric current, and after series connection, total induction electromotive force is connected coil induction electromotive force sum separately.Therefore, not only reduce the interference of even having eliminated exterior magnetic field, and the coefficient of mutual inductance of coil is multiplied the increase along with series connection pcb board number.
Pass the conductor of On current in the interior bone of all PCB Luo-coils, record differentiated voltage signal, one end ground connection of one or more pairs of PCB Luo-coils of series connection, the other end electrical connection amplifier circuit unit of one or more pairs of PCB Luo-coils of series connection, described differentiated voltage signal is amplified output by amplifier circuit unit.
In the present embodiment, amplifier circuit unit is homophase input amplifying circuit, comprises the first integrated transporting discharging, the first resistance R p, the second resistance R 1 and the 3rd resistance R 2; Wherein the first integrated transporting discharging adopts OP07CP, and the feature of this integrated transporting discharging is dual power supply, and precision is high, and temperature drift is little, and combination property is superior, applied widely.By this amplifier circuit unit, the fainter signal of Luo-coil output is amplified to meet the requirement of subsequent conditioning circuit to signal intensity under distortionless prerequisite.
One end of the first resistance is electrically connected the signal output part of one or more pairs of PCB Luo-coils, and the other end is electrically connected the positive input of the first integrated transporting discharging.One end ground connection of the second resistance, the other end is electrically connected the reverse input end of the first integrated transporting discharging.One end of the 3rd resistance is electrically connected the output terminal of described the first integrated transporting discharging, and the other end is electrically connected the reverse input end of the first integrated transporting discharging.
Integrating circuit unit electrical connection amplifier circuit unit, by the differentiated voltage signal integration amplifying, obtains the recovery voltage signal of the interior tested electric current of conductor that is proportional to On current.
In the present embodiment, integrating circuit unit is an integral operation circuit, comprises the second integrated transporting discharging, the 4th resistance R _ f, the 5th resistance R, the 6th resistance R p2 and the first capacitor C; Integrating circuit unit adopts inertial element to substitute true integral link, and the 4th resistance R _ f and the first capacitor C have formed a RC loop, have prevented that direct current and low frequency signal from reach capacity the output of integrator, thereby have avoided the impact of integrator drift.Wherein the second integrated transporting discharging adopts OP07CP, adopts the effect of inertial element approximate integration, has realized the inhibition to integrator drift, has also stablized working point simultaneously, and error has also been controlled in allowed band.One end of the 4th resistance is electrically connected the output terminal of described the second integrated transporting discharging, and the other end is electrically connected the positive input of the second integrated transporting discharging; One end of the 5th resistance is electrically connected the output terminal of the second integrated transporting discharging, and the other end is electrically connected the positive input of the second integrated transporting discharging; The first electric capacity two ends are connected in parallel on the two ends of the 5th resistance; One end of the 6th resistance is electrically connected the reverse input end of the second integrated transporting discharging, other end ground connection; The output terminal of the second integrated transporting discharging connects described sample circuit unit.
Sample circuit unit is electrically connected described integrating circuit unit, and described recovery voltage signal is sampled.
Comprise stationary installation, one or more pairs of PCB Luo-coils are parallel to each other equidistantly fixing, also comprise one or more pairs of PCB Luo-coils are close to situation about being fixed together, can adopt a variety of fixed mechanisms, the adhesive tape of clip, equally spaced draw-in groove, insulation etc. all can, do not limit.
In the present invention, measurement range can be from several amperes to tens kiloamperes, can be according to the size of concrete measuring object when better mode is specific design, change the resistance proportioning of amplifying element and integral element, to reach the more high precision in tested range of current.
As described in Figure 5, wherein: i
1(t) represent the tested electric current of primary side; L
0represent the total self-induction of one or more pairs of PCB Luo-coils; R
0represent Coil resistance; C
0represent coil turn-to-turn capacitance; R
afor sampling resistor.Equivalent circuit diagram can obtain following equation thus:
The induction electromotive force e (t) of coil can be expressed as:
Coefficient of mutual inductance between Luo-coil and current carrying conductor is:
In various above:
I---the momentary current flowing through in current carrying conductor, the A of unit;
μ
0---permeability of vacuum, μ
0=4 π × 10
-7h/m;
R
a---skeleton external diameter, the m of unit;
R
b---skeleton internal diameter, the m of unit;
H---skeleton height, the m of unit;
N---the coil winding number of turn.
Sampling resistor R
aon output voltage be:
In in-phase amplification circuit, enlargement factor is:
The transport function of the inertial element of Rf and C and the second integrated transporting discharging composition is:
Make s=j ω, above formula can turn to:
Amplitude-frequency response is:
Phase-frequency response is:
So the transport function of ideal integrator is:
The present invention also provides a kind of current measuring method based on combined type PCB type Luo-coil, comprises the following steps:
By one or more pairs of number of turns, skeleton height, skeleton external diameter, skeleton internal diameter and interior bone internal diameter all identical PCB type Luo-coil be connected in series, make in the coiling of two PCB Luo-coils of arbitrary neighborhood direction of current flow contrary, be respectively clockwise direction and counterclockwise.
By a stationary installation, described PCB type Luo-coil is fixed, make to be parallel to each other equidistantly between the pcb board of two adjacent PCB type Luo-coils, the circle center line connecting of all PCB type Luo-coil interior bone is at same straight line, and the interior bone of this straight line and described PCB type Luo-coil axially in the same way.According to the law of electromagnetic induction, even if there is external magnetic field to exist, its on two adjacent coils to respond to formation voltage size identical, but both opposite directions, therefore the impact of external magnetic field has not just existed altogether, both have offseted, but just in time direction is identical for the voltage inducing because of the magnetic field of tested electric current, and after series connection, total induction electromotive force is connected coil induction electromotive force sum separately.Therefore, not only reduce the interference of even having eliminated exterior magnetic field, and the coefficient of mutual inductance of coil is multiplied the increase along with series connection pcb board number.
Make the interior bone of a measured conductor through all PCB Luo-coils;
After measured conductor On current, the PCB type Luo-coil being electrically connected by series connection records a differentiated voltage signal;
The one or more pairs of PCB Luo-coils that are connected in series described in being electrically connected by amplifier circuit unit, amplify output by described differentiated voltage signal.
In the present embodiment, amplifier circuit unit is homophase input amplifying circuit, comprises the first integrated transporting discharging, the first resistance R p, the second resistance R 1 and the 3rd resistance R 3; Wherein the first integrated transporting discharging adopts OP07CP, and the feature of this integrated transporting discharging is dual power supply, and precision is high, and temperature drift is little, and combination property is superior, applied widely.By this amplifier circuit unit, the fainter signal of Luo-coil output is amplified to meet the requirement of subsequent conditioning circuit to signal intensity under distortionless prerequisite.One end of the first resistance is electrically connected the signal output part of one or more pairs of PCB Luo-coils, and the other end is electrically connected the positive input of the first integrated transporting discharging.One end ground connection of the second resistance, the other end is electrically connected the reverse input end of the first integrated transporting discharging.One end of the 3rd resistance is electrically connected the output terminal of described the first integrated transporting discharging, and the other end is electrically connected the reverse input end of the first integrated transporting discharging.
Be electrically connected described amplifier circuit unit by integrating circuit unit, by the differentiated voltage signal integration amplifying, obtain the recovery voltage signal of the interior tested electric current of conductor that is proportional to On current.
In the present embodiment, integrating circuit unit is an integral operation circuit, comprises the second integrated transporting discharging, the 4th resistance R _ f, the 5th resistance R, the 6th resistance R p2 and the first capacitor C; Integrating circuit unit adopts inertial element to substitute true integral link, and the 4th resistance R _ f and the first capacitor C have formed a RC loop, have prevented that direct current and low frequency signal from reach capacity the output of integrator, thereby have avoided the impact of integrator drift.Wherein the second integrated transporting discharging adopts OP07CP, adopts the effect of inertial element approximate integration, has realized the inhibition to integrator drift, has also stablized working point simultaneously, and error has also been controlled in allowed band.One end of the 4th resistance is electrically connected the output terminal of described the second integrated transporting discharging, and the other end is electrically connected the positive input of the second integrated transporting discharging; One end of the 5th resistance is electrically connected the output terminal of the second integrated transporting discharging, and the other end is electrically connected the positive input of the second integrated transporting discharging; The first electric capacity two ends are connected in parallel on the two ends of the 5th resistance; One end of the 6th resistance is electrically connected the reverse input end of the second integrated transporting discharging, other end ground connection; The output terminal of the second integrated transporting discharging connects described sample circuit unit.
By electrical connection integrating circuit unit, sample circuit unit, recovery voltage signal is sampled.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (9)
1. the current measuring device based on combined type PCB type Luo-coil, measures the conductor of an On current, it is characterized in that, comprises one or more pairs of PCB type Luo-coils, amplifier circuit unit, integrating circuit unit and sample circuit unit, wherein:
In described PCB type Luo-coil, include pcb board, interior bone and the coiling on pcb board, described one or more pairs of PCB type Luo-coil is all identical PCB type Luo-coils of number of turns, skeleton height, skeleton external diameter and skeleton internal diameter and interior bone internal diameter, spaced set is parallel to each other between the pcb board of two adjacent PCB type Luo-coils, and the circle center line connecting of the interior bone of all PCB type Luo-coils is at same straight line, and the interior bone of this straight line and described PCB type Luo-coil axially in the same way; Described one or more pairs of PCB Luo-coil is connected in series successively, and in the coiling of two PCB Luo-coils of arbitrary neighborhood, direction of current flow is contrary, is respectively clockwise direction and counter clockwise direction; The conductor that passes described On current in the interior bone of described one or more pairs of PCB Luo-coils, records differentiated voltage signal, one end ground connection of one or more pairs of PCB Luo-coils of described series connection;
The other end electrical connection amplifier circuit unit of one or more pairs of PCB Luo-coils of described series connection, described differentiated voltage signal is amplified output by described amplifier circuit unit;
Integrating circuit unit is electrically connected described amplifier circuit unit, by the differentiated voltage signal integration amplifying, obtains the recovery voltage signal of the interior tested electric current of conductor that is proportional to On current;
Sample circuit unit is electrically connected described integrating circuit unit, and described recovery voltage signal is sampled.
2. a kind of current measuring device based on combined type PCB type Luo-coil as claimed in claim 1, is characterized in that being, also comprises a stationary installation, described one or more pairs of PCB Luo-coils is parallel to each other equidistantly fixing.
3. a kind of current measuring device based on combined type PCB type Luo-coil of stating as claim 1 or 2, is characterized in that, described amplifier circuit unit is homophase input amplifying circuit, comprises the first integrated transporting discharging, the first resistance, the second resistance and the 3rd resistance; The signal output part of the described one or more pairs of PCB Luo-coils of one end electrical connection of described the first resistance, the other end is electrically connected the positive input of described the first integrated transporting discharging; One end ground connection of described the second resistance, the other end is electrically connected the reverse input end of described the first integrated transporting discharging; One end of described the 3rd resistance is electrically connected the output terminal of described the first integrated transporting discharging, and the other end is electrically connected the reverse input end of described the first integrated transporting discharging.
4. a kind of current measuring device based on combined type PCB type Luo-coil as claimed in claim 3, it is characterized in that, described integrating circuit unit is an integral operation circuit, comprises the second integrated transporting discharging, the 4th resistance, the 5th resistance, the 6th resistance and the first electric capacity; One end of described the 4th resistance is electrically connected the output terminal of described the second integrated transporting discharging, and the other end is electrically connected the positive input of described the second integrated transporting discharging; One end of described the 5th resistance is electrically connected the output terminal of described the second integrated transporting discharging, and the other end is electrically connected the positive input of described the second integrated transporting discharging; Described the first electric capacity two ends are connected in parallel on the two ends of described the 5th resistance; One end of described the 6th resistance is electrically connected the reverse input end of described the second integrated transporting discharging, other end ground connection; The output terminal of described the second integrated transporting discharging connects described sample circuit unit.
5. a kind of current measuring device based on combined type PCB type Luo-coil as claimed in claim 4, is characterized in that, described the first integrated transporting discharging and the second integrated transporting discharging all adopt OP07CP.
6. the current measuring method based on combined type PCB type Luo-coil, is characterized in that, comprises the following steps:
By one or more pairs of number of turns, skeleton height, skeleton external diameter, skeleton internal diameter and interior bone internal diameter all identical PCB type Luo-coil be connected in series, make in the coiling of two PCB Luo-coils of arbitrary neighborhood direction of current flow contrary, be respectively clockwise direction and counterclockwise;
By a stationary installation, described PCB type Luo-coil is fixed, make to be parallel to each other equidistantly between the pcb board of two adjacent PCB type Luo-coils, the circle center line connecting of all PCB type Luo-coil interior bone is at same straight line, and the interior bone of this straight line and described PCB type Luo-coil axially in the same way;
Make the interior bone of a measured conductor through all PCB Luo-coils;
After measured conductor On current, the PCB type Luo-coil being electrically connected by series connection records a differentiated voltage signal;
The one or more pairs of PCB Luo-coils that are connected in series described in being electrically connected by amplifier circuit unit, amplify output by described differentiated voltage signal;
Be electrically connected described amplifier circuit unit by integrating circuit unit, by the differentiated voltage signal integration amplifying, obtain the recovery voltage signal of the interior tested electric current of conductor that is proportional to On current;
Be electrically connected described integrating circuit unit by sample circuit unit, described recovery voltage signal is sampled.
7. a kind of current measuring method based on combined type PCB type Luo-coil as claimed in claim 6, is characterized in that, described amplifier circuit unit is homophase input amplifying circuit, comprises the first integrated transporting discharging, the first resistance, the second resistance and the 3rd resistance; The signal output part of the described one or more pairs of PCB Luo-coils of one end electrical connection of described the first resistance, the other end is electrically connected the positive input of described the first integrated transporting discharging; One end ground connection of described the second resistance, the other end is electrically connected the reverse input end of described the first integrated transporting discharging; One end of described the 3rd resistance is electrically connected the output terminal of described the first integrated transporting discharging, and the other end is electrically connected the reverse input end of described the first integrated transporting discharging.
8. a kind of current measuring method based on combined type PCB type Luo-coil as described in claim 6 or 7, it is characterized in that, described integrating circuit unit is an integral operation circuit, comprises the second integrated transporting discharging, the 4th resistance, the 5th resistance, the 6th resistance and the first electric capacity; One end of described the 4th resistance is electrically connected the output terminal of described the second integrated transporting discharging, and the other end is electrically connected the positive input of described the second integrated transporting discharging; One end of described the 5th resistance is electrically connected the output terminal of described the second integrated transporting discharging, and the other end is electrically connected the positive input of described the second integrated transporting discharging; Described the first electric capacity two ends are connected in parallel on the two ends of described the 5th resistance; One end of described the 6th resistance is electrically connected the reverse input end of described the second integrated transporting discharging, other end ground connection; The output terminal of described the second integrated transporting discharging connects described sample circuit unit.
9. a kind of current measuring method based on combined type PCB type Luo-coil as claimed in claim 8, is characterized in that, described the first integrated transporting discharging and the second integrated transporting discharging all adopt OP07CP.
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| CN109710010A (en) * | 2018-11-27 | 2019-05-03 | 江阴市星火电子科技有限公司 | A kind of Rogowski coil converter |
| CN109884378A (en) * | 2019-03-08 | 2019-06-14 | 南京导纳能科技有限公司 | A kind of arrester action current measuring circuit based on PCB type Rogowski coil |
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| CN113520521A (en) * | 2021-08-30 | 2021-10-22 | 江苏朴芃医疗科技有限公司 | Current peak value detection device, high voltage generator and vascular calcification treatment equipment |
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| CN104764919A (en) * | 2015-03-16 | 2015-07-08 | 中国计量学院 | Electronic type voltage transformer based on lossy double integrating circuit |
| CN106291079A (en) * | 2015-05-11 | 2017-01-04 | 南车株洲电力机车研究所有限公司 | Current sensing means and method |
| CN104851581A (en) * | 2015-05-25 | 2015-08-19 | 三峡大学 | High-precision-digital-quantity-output electronic current transformer |
| CN104851581B (en) * | 2015-05-25 | 2016-07-27 | 三峡大学 | A kind of high accuracy number amount output electronic current mutual inductor |
| CN106569025A (en) * | 2015-10-08 | 2017-04-19 | 云辰电子开发股份有限公司 | Device of measuring power consumption, device and method of measuring power supply status in non-contact manner |
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| US11385265B2 (en) | 2017-06-09 | 2022-07-12 | Ls Electric Co., Ltd. | Current sensing device |
| CN110691977A (en) * | 2017-06-09 | 2020-01-14 | Ls产电株式会社 | Current sensing device |
| CN111373272A (en) * | 2017-11-24 | 2020-07-03 | 新电元工业株式会社 | Substrate for inspection, assembly, and method for manufacturing substrate for inspection |
| CN108414812A (en) * | 2018-02-06 | 2018-08-17 | 国网安徽省电力有限公司 | A kind of electronic current mutual inductor and its characteristic analysis method based on Rogowski coil |
| WO2019241956A1 (en) * | 2018-06-21 | 2019-12-26 | 中国电力科学研究院有限公司 | Pulse current measuring device |
| CN109710010A (en) * | 2018-11-27 | 2019-05-03 | 江阴市星火电子科技有限公司 | A kind of Rogowski coil converter |
| CN109521265A (en) * | 2019-01-04 | 2019-03-26 | 水木源华电气有限公司 | A kind of digital electric mutual inductor of voltage and current combination |
| CN109884378A (en) * | 2019-03-08 | 2019-06-14 | 南京导纳能科技有限公司 | A kind of arrester action current measuring circuit based on PCB type Rogowski coil |
| CN112505388A (en) * | 2020-12-02 | 2021-03-16 | 国网宁夏电力有限公司电力科学研究院 | Current measuring device and current measuring system |
| CN112505388B (en) * | 2020-12-02 | 2022-05-10 | 国网宁夏电力有限公司电力科学研究院 | Current measuring device and current measuring system |
| CN113520521A (en) * | 2021-08-30 | 2021-10-22 | 江苏朴芃医疗科技有限公司 | Current peak value detection device, high voltage generator and vascular calcification treatment equipment |
| WO2023030345A1 (en) * | 2021-08-30 | 2023-03-09 | 江苏朴芃医疗科技有限公司 | Current peak value measurement apparatus, high voltage generator, and therapeutic device for vascular calcification |
| CN113520521B (en) * | 2021-08-30 | 2023-11-03 | 江苏朴芃医疗科技有限公司 | Current peak detection device, high-voltage generator and vascular calcification treatment equipment |
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