CN103913609B - The measuring instrumentss and its implementation not influenceed by alternation external magnetic field - Google Patents
The measuring instrumentss and its implementation not influenceed by alternation external magnetic field Download PDFInfo
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- CN103913609B CN103913609B CN201210591292.1A CN201210591292A CN103913609B CN 103913609 B CN103913609 B CN 103913609B CN 201210591292 A CN201210591292 A CN 201210591292A CN 103913609 B CN103913609 B CN 103913609B
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Abstract
The present invention proposes the measuring instrumentss and its implementation not influenceed by alternation external magnetic field, the signal acquisition that the measuring instrumentss include being connected on the printed circuit board (PCB) of integrated circuit covers copper lead, the current sampling resistor made of manganese copper alloy material, and current sample wire.Two current sample wires are closely alternately twisted into a sampling cotton rope.The area vector sum that the first end of the sampling cotton rope and the circular current loops of two current feeds composition are surrounded is zero.The area vector sum that the circular current loops that the second end of the sampling cotton rope and the current loop of current sampling resistor are formed are surrounded is zero.The present invention is by improving the mode of connection and wiring construction, reducing or even offset can be by the current loop area of outside action of alternating magnetic field, it is set in the induced voltage vector of alternating magnetic field to be zero, so as to be greatly decreased or even be completely counterbalanced by influence of the outside alternating magnetic field to current sample module.
Description
Technical field
The present invention relates to the method for preventing from measuring instrumentss from occurring misreading several situations and the measuring instrumentss of application this method, especially
It is to be related to the measuring instrumentss for preventing that there is current sample module to produce induced-current because being influenceed by outside alternating magnetic field, causes to survey
The method and the measuring instrumentss of application this method that the amount improper electric current of instrument shows or counted.
Background technology
The Typical Representative of measuring instrumentss with current sample module is electric energy meter, or power meter, in addition to some are special
The measuring instrumentss of purpose are measured, such as only need to measure the ammeter of current data, it is necessary to by current data and other data knots
Measuring instrumentss of measurement etc. are completed altogether, and these measuring instrumentss are all set due to all carrying out sampled measurements to current signal
It is equipped with the separate modular for completing current sample, or the comprehensively sampling module with current sample functional module, the present invention
Such measuring instrumentss are referred to as to the measuring instrumentss with current sample module.Measuring instrumentss actual use when will be by reality
Border running environment influences and occurred the situation for influenceing accuracy of measurement.For the measuring instrumentss with current sample module, if
Operate in the environment with outside alternating magnetic field, the external magnetic field of alternation will be made in the current sample module in measuring instrumentss
Produce induced-current.The outside alternating magnetic field may be from power equipment near measuring instrumentss, power line etc..Normal
During measurement, influenceed by outside alternating magnetic field and caused induced-current influences to be not easy to realize on actual measured results, but when surveying
Instrument is measured in the case of no sampled measurements, being influenceed caused induced-current by outside alternating magnetic field also will be by current sample
Module is gathered, and induced-current is included in into actual measured results, causes measuring instrumentss when being powered, but without measurement current conditions
Under, the measuring instrumentss of electronic type and measurement current module are influenceed by outside alternating magnetic field, and caused by improper electric current show or
Count, such a situation is referred to as shunt running phenomenon for power measuring instrument.
Improper electricity caused by can quantitatively embodying the outside alternating magnetic field by experiment counts, as shown in figure 9,
Experimental rig, TD8600E type Tesla meters are influenceed with ZHZ-26A type alternating current impressions magnetic field, three-phase electric energy program control test device is
Experimental rig, X side is applied respectively to the single-phase charge-controlled intelligent electric meter as the measuring instrumentss 9 with current sample module
To, Y-direction and the 0.5mT, i.e. 0.5 milli tesla of Z-direction alternating magnetic field, measure is influenceed by X-direction 0.5mT alternating magnetic fields
24mA induced-current is produced in current sample module, is influenceed to produce in current sample module by Y-direction 0.5mT alternating magnetic fields
38mA induced-current, influenceed to produce 0mA induced-current in current sample module by Z-direction 0.5mT alternating magnetic fields.By upper
State experiment it is visible, influenceed by outside alternating magnetic field, the measuring instrumentss be powered when, but without measurement current conditions under, electronic type
Measuring instrumentss and measurement current module influenceed by outside alternating magnetic field, and caused by improper electric current show or count phenomenon,
Or shunt running phenomenon is implicitly present in.
It is the electricity tariff meter of representative in family and industrial using the single-phase charge-controlled intelligent electric meter that is used in the experiment
It is commonly used in family, well imagines that the shunt running phenomenon obviously will cause unnecessary economic damage to electricity tariff meter user
Lose.So being influenceed by outside alternating magnetic field and caused shunt running can not only make all measuring instrument meters with current sample module
Amount is inaccurate, and it is exactly user of the meeting to family expenses or industrial Changeable electric meter that performance is the most prominent for it, influences the defects of maximum
Bring unnecessary economic loss.
The content of the invention
The technical problem to be solved in the present invention is to avoid the deficiencies in the prior art part and proposing one kind prevents from having electricity
The measuring instrumentss of stream sampling module are occurred the method that improper electric current showed or counted phenomenon, Yi Jiying by outside alternating magnetic field
With the measuring instrumentss with current sample module of this method.The present invention is connect according to faradic principle of inducting by improving
Line mode and wiring construction, it is greatly decreased or even is completely counterbalanced by the annular electro of the hard to bear action of alternating magnetic field of current sample module interior energy
Flow back to road and surround area, so as to suppress influence of the outside alternating magnetic field to current sample module.
The present invention, which solves the technical problem, to be realized by using following technical scheme：
Design, manufacture a kind of measuring instrumentss with current sample module not influenceed by alternation external magnetic field, including signal
Printed circuit board (PCB), the current sampling resistor made of manganese copper alloy material are gathered, and is connected electrically in the signal acquisition print
Two current sample wires between printed circuit board and current sampling resistor.The signal acquisition printed circuit board (PCB) includes signal
Process chip and two current feeds.It is by two current feed that signal processing chip and two current sample wires is electric
Connection.Especially, two current sample wires helically ring-type closely alternately be twisted into one have first end and
The sampling cotton rope of the second end.Two current sample wires of first end of the sampling cotton rope electrically connect the signal acquisition print
Printed circuit board, the face that the circular current loops for making two current sample wires of the first end and two current feeds form are surrounded
Product vector sum is zero.Two current sample wires of the second end of the sampling cotton rope electrically connect the current sampling resistor
Device, the circular current loops institute for making the current loop of two current sample wires of the second end and current sampling resistor form
The area vector sum surrounded is zero.The area vector refers to the directive plane face of tool surrounded by circular current loops
Product, the direction of the area vector determine according to the sense of current for the circular current loops for surrounding plane.
Specifically, the direction of the area vector is determined by right-hand rule, i.e., is clenched fist with the right hand, thumb center
Axis by other four refer to around and the thumb cylindrical coordinate system that fist overhangs and formed to the right based on, when the right hand is other
When four fingers are clenched fist by the sense of current in circular current loops, the sensing of thumb is exactly the area that circular current loops are surrounded
The direction of vector.
A kind of scheme for sampling cotton rope and being electrically connected with signal acquisition printed circuit board (PCB), the first end two of the sampling cotton rope
Root current sample wire is electrically connected two current feeds of the printed circuit board (PCB), and wherein a current sample wire is curved
Song is arranged in printed circuit board (PCB) in semicircular, the ring surface for making root bending be surrounded in the current sample wire of semicircular
Product and the annulus area that two current feeds are surrounded are equal in magnitude, and area vector is in opposite direction, so as to make the first end two
The area vector sum that the circular current loops of root current sample wire and two current feeds composition are surrounded is zero.
Specifically, collection signal connection end point is provided with the signal acquisition printed circuit board (PCB).The signal acquisition
Chip includes two current acquisition pins.Two current feed is the two current feed wires for wrapping the epidermis that insulate, two electricity
Stream wire-lead is respectively electrically connected between two current acquisition pins of signal acquisition chip and 2 collection signal connection end points.Or
Person, two current feed are two printed circuit current feeds being printed on signal acquisition printed circuit board (PCB), the two printings electricity
Road current feed is respectively electrically connected between two current acquisition pins of signal acquisition chip and 2 collection signal connection end points.
The scheme that another kind sampling cotton rope electrically connects with signal acquisition printed circuit board (PCB), mutually nothing is electrically connected two current feed
Ground connection, set across on a printed circuit.Two current sample wires of first end of the sampling cotton rope are electrically connected respectively
Two current feeds of the printed circuit board (PCB) are connect, are made between the current sample wire and current feed being electrically connected by two
The crosspoint of current feed surrounds at least one pair of circular current loops, and the annulus area that the circular current loops are surrounded
Equal in magnitude, area vector is in opposite direction, so as to make described two current sample wires of first end and two current feeds form
The area vector sum that is surrounded of circular current loops be zero.
Specifically, 2 collection signal connection end points, and a wire are provided with the signal acquisition printed circuit board (PCB)
Through hole.By the wire through-hole, mutually nothing is set on a printed circuit two current feed electrically, across.The letter
Number acquisition chip includes two current acquisition pins.Two current feed is the two current feed wires for wrapping the epidermis that insulate,
The two current feeds wire is respectively electrically connected to the two current acquisition pins and 2 collection signal connection end points of signal acquisition chip
Between, and by the wire through-hole, mutually nothing is set on a printed circuit electrically, across.Or two electricity
One in stream lead is the printed circuit current feed being printed on signal acquisition printed circuit board (PCB), and another is to wrap absolutely
Two current feed wires of edge epidermis, the printed circuit current feed are connected electrically in the current acquisition pin of signal acquisition chip
Between collection signal connection end point, the current feed wire is through the wire through-hole with printed circuit current feed without electricity
Connection ground, it is arranged in a crossed manner on a printed circuit, and the current feed wire is connected electrically in the electric current of signal acquisition chip
Gather between pin and collection signal connection end point.
Another makes current feed be electrically connected to each other scheme arranged in a crossed manner, on the signal acquisition printed circuit board (PCB)
It is provided with 2 collection signal connection end points, and two conductive poles for running through the signal acquisition printed circuit board (PCB).The signal
Acquisition chip includes two current acquisition pins.Two current feed each includes the branch line of current feed first and current feed the
Two branch lines.The respective branch line of current feed first of two current feeds is separately positioned on the two sides of signal acquisition printed circuit board (PCB)
On, and be connected electrically between two conductive poles and two current acquisition pins, make two the first branch lines of current feed without electrically, intersect
Set on a printed circuit.The respective branch line of current feed second of two current feeds is separately positioned on signal acquisition printing
On the two sides of circuit board, and it is connected electrically between two conductive poles and 2 collection signal connection end points, makes two current feed second
Line without electrically, it is arranged in a crossed manner on a printed circuit.So as to by two current feeds by the two of the signal acquisition chip
Current acquisition pin is electrically connected to the collection signal connection end point.Two current feed is two electricity for wrapping the epidermis that insulate
Wire-lead is flowed, or, two current feed is the printed circuit current feed being printed on signal acquisition printed circuit board (PCB).
A kind of scheme for sampling cotton rope and being electrically connected with current sampling resistor, two electricity of the second end of the sampling cotton rope
Stream sampling wire is electrically connected the current sampling resistor, and a wherein current sample wire attaches and is wrapped in electric current
Sampling resistor surface, on the longitudinal section direction of current sampling resistor, it is wrapped in described in order on current sampling resistor
The area that the circular current loops in current loop and current sampling resistor that current sample wire is surrounded each are surrounded
It is equal in magnitude, area vector is in opposite direction, make it is described sampling cotton rope two current sample wires of the second end and current sample
The area vector sum that the circular current loops that resistor is formed are surrounded is zero.
The scheme that another kind sampling cotton rope electrically connects with current sampling resistor, the second end two of the sampling cotton rope
Current sample wire is electrically connected two connection ends of the current sampling resistor, and described two current samples of the second end are led
Line furcation is arranged on the position away from two connection end on current sampling resistor, and from two current samples of the second end
Wire furcation to two sections of current sample wires between two current sample wires and the connection end of current sampling resistor all
Current sampling resistor surface is attached to, on the longitudinal section direction of current sampling resistor, current sample is attached to described in order
The ring that the current loop in current loop and current sampling resistor that current sample wire on resistor is surrounded is surrounded
Shape current loop size is equal, area vector is in opposite direction, makes two current samples of the second end of the sampling cotton rope
The area vector sum that the circular current loops that wire is formed with current sampling resistor are surrounded is zero.
Specifically, the current sampling resistor is to use resistor made of manganese copper alloy material.
Considering to be applied to the measuring instrumentss generally used, the measuring instrumentss are the measuring instrumentss for measuring electrical power,
Also include being connected electrically in voltage sample wire between the signal acquisition printed circuit board (PCB) and current sampling resistor, described two
Root current sample wire, and helically ring-type is closely twisted into one and has first end and the second end voltage sample wire
The sampling cotton rope in portion, i.e. voltage sample wire stranding in sampling cotton rope, and with two current sample wires helically ring-type
Closely twist together.
The present invention, which solves the technical problem, to be realized by using following technical scheme：
Implement a kind of method for making the measuring instrumentss with current sample module not influenceed by alternation external magnetic field, the measurement
Instrument includes signal acquisition printed circuit board (PCB), current sampling resistor, and is connected electrically in the signal acquisition printed circuit board (PCB)
Two current sample wires between current sampling resistor.The signal acquisition printed circuit board (PCB) includes signal processing chip
With two current feeds.Signal processing chip is electrically connected with two current sample wires by two current feed.Institute
The method of stating comprises the following steps：
A. by two current sample wires, helically closely alternately be twisted into one has first end and second to ring-type
The sampling cotton rope of end；
B. two current sample wires of first end of the sampling cotton rope are electrically connected into the collection printed circuit board (PCB),
The circular current loops for setting current sample wire and current feed to be surrounded, make two current sample wires of the first end with
The area vector sum that the circular current loops of two current feeds composition are surrounded is zero；
C. two current sample wires of the second end of the sampling cotton rope are electrically connected into the current sampling resistor,
Current loop path when setting current sample wire electrically connects with current sampling resistor, makes two electric currents of the second end adopt
The area vector sum that the circular current loops that sample wire is formed with the current loop in current sampling resistor are surrounded is zero.
Specifically, the step B is included as follows step by step,
B11. a current sample wire in the current sample wire of first end two of the sampling cotton rope is electrically connected
A piece current feed of the printed circuit board (PCB)；
B12. another current sample wire in the current sample wire of first end two of the sampling cotton rope is first existed
Another current feed is electrically connected again after semicircular is bent in printed circuit board (PCB)；
B13. length of the bending in the current sample wire of semicircular is adjusted, makes electricity of the root bending in semicircular
The annulus area that stream sampling wire is surrounded and the annulus area that two current feeds are surrounded are equal in magnitude, area vector direction phase
Instead, so as to making the face that the circular current loops of described two current sample wires of first end and two current feeds composition are surrounded
Product vector sum is zero.
In addition, the step B can also be included as follows step by step,
B21. by two current feed, mutually nothing is set on a printed circuit electrically, across；
B22. two current sample wires of first end of the sampling cotton rope are electrically connected the printed circuit board (PCB)
Two current feeds, so as to by the order of the crosspoint of two current feeds the current sample wire and current feed that are electrically connected
Between surround at least one pair of circular current loops；
B23. the position in the crosspoint of two current feeds, and two electric currents of first end of the sampling cotton rope are adjusted
The length of wire is sampled, makes two annular electros surrounded between the current sample wire and current feed being electrically connected flow back to
The size on road is equal, and area vector is in opposite direction, so as to make described two current sample wires of first end and two electricity
The area vector sum that the circular current loops of stream lead composition are surrounded is zero.
Specifically, the step C is included as follows step by step,
C11. it is a current sample wire in two current sample wires of the second end of the sampling cotton rope is direct
Electrically connect a connection end of the current sampling resistor；
C12. it is another current sample wire in two current sample wires of the second end of the sampling cotton rope is first
Attaching is wrapped in current sampling resistor surface, then electrically connects another connection end of current sampling resistor；
B13. adjustment is wrapped in the canoe of the current sample wire on current sampling resistor, in current sample electricity
On the longitudinal section direction for hindering device, current loop that the current sample wire that is wrapped in described in order on current sampling resistor is surrounded
It is equal with the size that the circular current loops in current sampling resistor are each surrounded, area vector is in opposite direction, from
And the circular current loops for making two current sample wires of the second end of the sampling cotton rope be formed with current sampling resistor
The area vector sum surrounded is zero.
In addition, the step C can also be included as follows step by step,
C21. two current sample wires of the second end of the sampling cotton rope are electrically connected the current sample electricity
Two connection ends of device are hindered, described two current sample wire furcations of the second end are arranged on current sampling resistor away from institute
The position of two connection ends is stated, and from two current sample wire furcations of the second end to two current sample wires and electric current
Two sections of current sample wires between the connection end point of sampling resistor are all attached to current sampling resistor surface；
C22. adjust from two current sample wire furcations of the second end to two current sample wires and current sample
The length of two sections of current sample wires between the connection end point of resistor, on the longitudinal section direction of current sampling resistor,
In the current loop and current sampling resistor that the current sample wire being attached to described in order on current sampling resistor is surrounded
The circular current loops size that is surrounded of current loop it is equal, area vector is in opposite direction, makes the sampling cotton rope
The area vector that the circular current loops that two current sample wires of the second end and current sampling resistor are formed are surrounded it
With for zero.
Compared with the existing technology compared with the skill of " measuring instrumentss and its implementation that are not influenceed by alternation external magnetic field " of the invention
Art effect is：
The present invention, by improving the mode of connection and wiring construction, is utilized with electric current loop according to faradic principle of inducting
Road for border space face domain directionality, reduce even offset can by the current loop area of outside action of alternating magnetic field,
It is set in the induced voltage vector of alternating magnetic field to be zero, so as to be greatly decreased or even be completely counterbalanced by outside alternating magnetic field to electric current
The influence of sampling module, the measuring instrumentss are substantially eliminated because being influenceed to influence current sample module by outside alternating magnetic field.
Brief description of the drawings
Fig. 1 is the positive throwing of " measuring instrumentss and its implementation that are not influenceed by alternation external magnetic field " first embodiment of the invention
Shadow schematic front view；
Fig. 2, which is that the orthographic projection of the first embodiment is right, regards schematic diagram；
Fig. 3 is the orthographic projection schematic front view of second embodiment of the invention；
Fig. 4, which is that the orthographic projection of the second embodiment is right, regards schematic diagram；
Fig. 5 is the orthographic projection schematic front view of the signal acquisition printed circuit board (PCB) 1 of third embodiment of the invention；
Fig. 6 is the orthographic projection schematic front view of the signal acquisition printed circuit board (PCB) 1 of fourth embodiment of the invention；
Fig. 7 is the orthographic projection schematic front view of the signal acquisition printed circuit board (PCB) 1 of fifth embodiment of the invention；
Fig. 8 is the schematic diagram for the cylindrical coordinate system that area vector of the present invention is based on；
Fig. 9 is the Distribution of Magnetic Field schematic diagram that external magnetic field influences experiment on measuring instrumentss；
Figure 10 is the orthographic projection schematic front view of prior art measuring instrumentss；
Figure 11, which is that the orthographic projection of prior art measuring instrumentss is right, regards schematic diagram.
Embodiment
It is described in further detail below in conjunction with each embodiment shown in accompanying drawing.
Further carry out eliminating false actuation test and putting into practice based on the present invention program experiment described earlier, therefore with
Lower binding tests conclusion describes technical solution of the present invention and every embodiment in detail.
As shown in Figure 10 and Figure 11, the measuring instrumentss that prior art has current sample module all comprise at least signal acquisition
Printed circuit board (PCB) 1 ', current sampling resistor 3 ', and adopted for electrically connecting the signal acquisition printed circuit board (PCB) 1 ' with electric current
Two current sample wires 21 ', 22 ' of sample resistor 3 '.Signal acquisition printed circuit board (PCB) 1 ', current sampling resistor 3 ' and electricity
Stream sampling wire 21 ', 22 ' forms the current sample module of measuring instrumentss.At least should on the signal acquisition printed circuit board (PCB) 1 '
It is electrically connected when being provided with signal processing chip 13 ', and for completing signal processing chip 13 ' with current sample wire 21 ', 22 '
The current feed 11 ', 12 ' connect.The measuring instrumentss with current sample module are with shunt running phenomenon according to confirming above
Experiment, as shown in figure 8, outside the 0.5mT for applying X-direction during alternating magnetic field, the electric current measured in current sample module is
24mA；Outside the 0.5mT for applying Y direction during alternating magnetic field, it is 38mA to measure the electric current in current sample module；Work as application
Outside the 0.5mT of Z-direction during alternating magnetic field, it is 0mA to measure the electric current in current sample module.Produced in current sample module
Raw induced-current just necessarily leads to induced electromotive force, according to faraday's law of magnetic induction, induced electromotive force E size and magnetic field
Flux change rate ΔΦ is directly proportional, i.e.,
E=n × ΔΦ/Δ t,
Wherein n is the magnet coil number of turn for producing magnetic field, and Δ t refers to the magnetic fields period.And magnetic flux Φ and magnetic field
Intensity B, and the area S that surrounds of current loop of magnetic fields are relevant, i.e.,
ΔΦ=Δ B × Δ S.
It can be obtained according to above-mentioned two equation,
E=n × Δ B × Δ S/ Δs t.
In the spatial domain, the area that the current loop of magnetic fields surrounds uses area vector, only described current loop
The plane surrounded is present in the case of the area component of magnetic direction, and magnetic field could act on the current loop and produce
Induced electromotive force.Therefore the necessary condition for producing induced electromotive force is the current loop that have in magnetic field, and current loop is enclosed
Into plane area component perpendicular to magnetic direction be present, and in the area of plane that surrounds of magnetic field or current loop at least
One is variable quantity.
As shown in Figs. 9 to 11, the orthographic projection main view direction of the measuring instrumentss with current sample module or backsight
Direction is exactly the direction of X-axis magnetic fields, and the right apparent direction of orthographic projection of the measuring instrumentss or left view direction are exactly Y-axis magnetic field
The direction of effect, the orthographic projection overlook direction of the measuring instrumentss or looks up the direction that direction is exactly Z axis magnetic fields.According to
Above-mentioned deduction process can explain the confirmation experiment of the measuring instrumentss with current sample module with shunt running phenomenon, such as scheme
Shown in 10, when applying X-direction magnetic field, exist and returned by what current sample wire 21 ', 22 ' and current feed 11 ', 12 ' were formed
Road, and the area normal that surrounds of the loop and X-direction, therefore induced electromotive force is produced on the loop, and then formed
24mA induced-current.As shown in figure 11, when applying Y direction magnetic field, exist and adopted by current sample wire 21 ', 22 ' and electric current
The loop that sample resistor 3 ' is formed, and the area normal that surrounds of the loop and Y direction, therefore sensing is produced on the loop
Electromotive force, and then form 38mA induced-current.When applying Z-direction magnetic field, due in the absence of current loop, that is, do not deposit
In the area of plane surrounded by current loop perpendicular to Z-direction magnetic field, i.e. Δ S=0, therefore current sample module is in Z axis
Induced electromotive force is not produced under the magnetic fields of direction, does not also just have induced-current.
To above-mentioned experiment, further research is as follows：
（1）The electrical connection of two current sample wires 21 ', 22 ' and current sampling resistor 3 ' is disconnected, will be adopted positioned at electric current
The short circuit of two current sample wires 21 ', 22 ' of the one end of sample resistor 3 ', applies 0.5mT X-direction alternating magnetic field, measures electricity
Flow sampling module electric current be 24mA, so as to further illustrate X-direction magnetic field only to two current sample wires 21 ', 22 ' with
The loop checking installation that signal acquisition printed circuit board (PCB) 1 ' is electrically connected to form has an impact.
（2）Separating tests 1, the electrical connection of two current sample wires 21 ', 22 ' and signal acquisition printed circuit board (PCB) 1 ' is disconnected,
With positioned at signal acquisition printed circuit board (PCB) 1 ' the both ends of circular wire in the plane be electrically connected the current feed
11 ', 12 ' end, and the circular wire is outer positioned at collection printed circuit board (PCB) 1 ', and the area of the circular wire is big
In the end of current feed 11 ', 12 ', apply 0.5mT X-direction alternating magnetic field, measuring the electric current of current sample module is
180mA；
Separating tests 2, by the circular wire be arranged in gather printed circuit board (PCB) 1 ' it is interior, and signal acquisition print
The institute of circuit board 1 ' in the plane, applies 0.5mT X-direction alternating magnetic field, the electric current for measuring current sample module is 156mA；
Separating tests 3, circular wire is disconnected, the end of current feed 11 ', 12 ' described in a direct short circuit of straight wire,
Apply 0.5mT X-direction alternating magnetic field, the electric current for measuring current sample module is 12mA；
Assuming that the electric current in separating tests 1 and 2 in circular ampere wires is a mA, it is assumed that in electric current in separating tests 1 and 2
Electric current in the loop of lead 11 ', 12 ' is b mA, then have a+b=180mA according to separating tests 1, according to separating tests 2 have a-b=
156mA, so that it is determined that a=168mA, b=12mA.
The card number electric current demonstrated in the loop of current feed 11 ', 12 ' of experiment 3 is 12mA.
Above-mentioned separating tests explanation, positioned at signal acquisition printed circuit board (PCB) 1 ' circular wire in the plane set respectively
In inside and outside influenceed by X-direction magnetic field of signal acquisition printed circuit board (PCB) 1 ', caused induced electricity flow valuve is different, that is, annulus
The set location of shape wire will influence induced-current size, and sensing will be increased outside by being arranged on signal acquisition printed circuit board (PCB) 1 '
Size of current, is arranged on that signal acquisition printed circuit board (PCB) 1 ' is interior will to reduce induced-current size.Thus inference, annular shape is led
Line is arranged on interior the formed induced-current of signal acquisition printed circuit board (PCB) 1 ' and will reduced, if reducing circular conductor side
Product, it will make induced-current smaller, especially circular wire glass and current feed 11 ', 12 ' surround area it is identical when,
It is zero that should can make induced-current.
Above-mentioned inference can be offset with induced-current and be explained, when circular wire is arranged on signal acquisition printed circuit board (PCB) 1 '
Institute is in the plane and when its is interior, if being influenceed to produce induced-current, the caused induced electricity in circular wire by external magnetic field
The inductive current direction formed in stream and 11 ', 12 ' middle loop checking installation of current feed is on the contrary, when the face surrounded of circular wire
When product is identical with the area that current feed 11 ', 12 ' surrounds, induced-current size is identical in two loops, in the opposite direction, so as to it
Caused by induced-current cancel each other.Above-mentioned inference can also use E=n × Δ B × Δ S/ Δs t Faraday's law explanation,
When circular wire be arranged on the institute of signal acquisition printed circuit board (PCB) 1 ' in the plane and it is interior at its when, if circular wire with
There is electric current in the loop that current feed 11 ', 12 ' is formed, the area of plane vector that circular wire surrounds and current feed 11 ',
12 ' the area of plane vectors surrounded are equal in magnitude in opposite direction, i.e., their area vector sum is zero, i.e. Δ S=0, also
Induced electromotive force will not be produced.
The direction of the area vector can be determined by right-hand rule, i.e., clenched fist with the right hand, thumb central axis
By other four refer to around and the thumb cylindrical coordinate system that fist overhangs and formed to the right based on, when the right hand it is other four refer to
When being clenched fist by the sense of current in circular current loops, the sensing of thumb is exactly the area vector that circular current loops are surrounded
Direction.
According to above-mentioned experiment, the present invention proposes that following technical scheme order is in the current sample module in alternating magnetic field
The area of plane vector that circular current loops are surrounded is zero, that is, implements a kind of measuring instrumentss of the order with current sample module not
The method influenceed by alternation external magnetic field, as shown in Figures 1 to 7, the measuring instrumentss include signal acquisition printed circuit board (PCB) 1, electricity
Flow sampling resistor 3, and two be connected electrically between the signal acquisition printed circuit board (PCB) 1 and current sampling resistor 3
Current sample wire 21,22.The signal acquisition printed circuit board (PCB) 1 includes the current feed 11,12 of signal processing chip 13 and two.
The signal acquisition that the current feed can be attached on the signal acquisition printed circuit board (PCB) 1 of signal processing chip 13 is covered copper and drawn
Line.Signal processing chip 13 is electrically connected with two current sample wires 21,22 by two current feed 11,12.
Methods described comprises the following steps：
A. by two current sample wires 21,22, helically closely alternately be twisted into one has first end to ring-type
With the sampling cotton rope 2 of the second end；As shown in figure 1, it is wound in spiral ring when described two sampling wires 21,22 are alternately twisted
When, current direction LP21, LP22 in every a pair of current samples conductor loop 21,22 are in opposite direction, it means that every a pair of electricity
The area vector for the current loop that stream sampling conductor loop 21,22 each surrounds is equal in magnitude, and in the opposite direction, i.e., every a pair of electric currents are adopted
The area vector for the current loop that sample conductor loop 21,22 each surrounds and be zero；Thus the alternating magnetic field of any direction all can not
Induced-current is produced in the spiral ring part of current sample wire 21,22.
B. by the electrical connection of two current sample wires of first end 21,22 of the sampling cotton rope 2 collection printing electricity
Road plate 1, the circular current loops for setting current sample wire 21,22 and current feed 11,12 to be surrounded, makes the first end two
The area vector sum that the circular current loops that root current sample wire 21,22 forms with two current feeds 11,12 are surrounded is
Zero, so as to be electrically connected in two current sample wires of first end 21,22 of sampling cotton rope 2 with the collection printed circuit board (PCB) 1
Part current loop in suppress produce induced-current.
C. two current sample wires of the second end 21,22 of the sampling cotton rope 2 are electrically connected into the current sample electricity
Device 3 is hindered, current loop path when setting current sample wire 21,22 electrically connects with current sampling resistor 3, makes second end
The circular current loops that two, portion current sample wire 21,22 is formed with the current loop in current sampling resistor 3 are surrounded
Area vector sum be zero, so as to sampling cotton rope 2 two current sample wires of the second end 21,22 adopted with the electric current
Suppress to produce induced-current in the current loop for the part that sample resistor 3 electrically connects.
A kind of surveying with current sample module not influenceed by alternation external magnetic field is also proposed according to the above method present invention
Measure instrument, including signal acquisition printed circuit board (PCB) 1, current sampling resistor 3 made of manganese copper alloy material, and electrical connection
Two current sample wires 21,22 between the signal acquisition printed circuit board (PCB) 1 and current sampling resistor 3.The letter
Number collection printed circuit board (PCB) 1 include the current feed 11,12 of signal processing chip 13 and two.By two current feed 11,12
Signal processing chip 13 is electrically connected with two current sample wires 21,22.Especially, two current sample wires
21st, 22 helically ring-type be closely alternately twisted into a sampling cotton rope 2 with first end and the second end.The sampling
Two current sample wires of first end 21,22 of cotton rope 2 electrically connect the signal acquisition printed circuit board (PCB) 1, make the first end
The area vector that is surrounded of circular current loops of two, portion current sample wire 21,22 and two current feeds 11,12 composition it
With for zero.Two current sample wires of the second end 21,22 of the sampling cotton rope 2 electrically connect the current sampling resistor 3,
The annular electro for making the current loop of two current sample wires of the second end 21,22 and current sampling resistor 3 form flows back to
The area vector sum that road is surrounded is zero.The area vector refers to the directive plane of tool surrounded by circular current loops
Area, the direction of the area vector determine according to the sense of current for the circular current loops for surrounding plane.
Specifically, as shown in figure 8, the direction of the area vector is determined by right-hand rule, i.e., clenched fist with the right hand,
Thumb central axis P by other four refer to around and the thumb cylindrical coordinate system that fist overhangs and formed to the right based on,
The right hand other four refers to around cylinder O is formed, and the cylindrical coordinate system refers to the electricity pressed in circular current loops when the right hand other four
When stream direction LP4 clenches fist, the sensing LP5 of thumb is exactly the direction for the area vector that circular current loops are surrounded.
According to above-mentioned separating tests 1 and 2, circular current loops area is made to swear how to be implemented in actual mechanical process
The prompting that proposes measured and be zero, the opposite circular current loops exactly by manufacturing its interior sense of current, and make ring current
It is zero that loop, which surrounds area of plane vector,.
Present invention proposition uses following scheme during sampling cotton rope 2 electrically connects with signal acquisition printed circuit board (PCB) 1, i.e.,
The step B is included as follows step by step,
B11. by a current sample wire in the current sample wire 21,22 of first end two of the sampling cotton rope 2
A piece current feed 12 of the 22 electrical connection printed circuit board (PCB)s 1；
B12. another current sample in the current sample wire 21,22 of first end two of the sampling cotton rope 2 is led
Line 21 electrically connects another current feed 11 again after semicircular is first bent in printed circuit board (PCB) 1；
B13. length of the bending in the current sample wire 21 of semicircular is adjusted, makes root bending in semicircular
The annulus area that current sample wire 21 is surrounded and the annulus area that two current feeds 11,12 are surrounded are equal in magnitude, area
Direction vector is on the contrary, so as to make the ring of two current sample wires 21,22 of first end and two current feeds 11,12 composition
The area vector sum that shape current loop is surrounded is zero.
The present invention realizes that sampling cotton rope 2 is electrically connected with signal acquisition printed circuit board (PCB) 1 by first embodiment as shown in Figure 1
Scheme is connect, two current sample wires of first end 21,22 of the sampling cotton rope 2 are electrically connected the printed circuit board (PCB) 1
Two current feeds 11,12, and the bending of wherein current sample wire 21 is arranged on printed circuit board (PCB) 1 in semicircular
Interior, the annulus area for making root bending be surrounded in the current sample wire 21 of semicircular is surrounded with two current feeds 11,12
Annulus area it is equal in magnitude, area vector is in opposite direction, so as to make described two current sample wires of first end 21,22 with
The area vector sum that the circular current loops of two current feeds 11,12 composition are surrounded is zero.
As shown in figure 1, when the electric current in current sample wire 21 of the bending in semicircular presses LP11 to LP12 extremely
During LP13 direction flowing, by by LP14 to LP15 direction in the circular current loops that two current feeds 11,12 are surrounded
Flow back in another current sample wire 22 of sampling cotton rope 2, the program can determine that bending in half by the right-hand rule
The area of plane vector that the current sample wire 21 of ring-type is surrounded is the direction out of drawing to outside drawing, and two current feeds
11st, 12 area of plane vectors surrounded are the directions out of drawing extroversion drawing, and they are in opposite direction, and it is in semi-ring to bend
The area of plane that the current sample wire 21 of shape is surrounded and the area of plane that two current feeds 11,12 are surrounded are equal in magnitude,
The thus vector for the area of plane that sampling cotton rope 2 is surrounded with the loop circuit that signal acquisition printed circuit board (PCB) 1 is electrically connected to form
Be zero, so as to sampling cotton rope 2 and signal acquisition printed circuit board (PCB) 1 between will not produce induced-current.
First embodiment of the invention, as shown in figure 1, being provided with collection signal on the signal acquisition printed circuit board (PCB) 1
Connection end point 15,16.The signal acquisition chip 13 includes two current acquisition pins 131,132.Two current feed 11,12
It is two printed circuit current feeds being printed on signal acquisition printed circuit board (PCB) 1, the two printed circuits current feed is electric respectively
It is connected between two current acquisition pins 131,132 and two collection signal connection end point 15,16 of signal acquisition chip 13.
In addition, two current feed 11,12 can also be the two current feed wires for wrapping the epidermis that insulate, two electricity
Stream wire-lead is respectively electrically connected to two current acquisition pins 131, the 132 and two collection signal connection end of signal acquisition chip 13
Between point 15,16.
The present invention proposes to use following scheme during sampling cotton rope 2 electrically connects with current sampling resistor 3, i.e., described
Step C is included as follows step by step, as shown in Fig. 2
C11. a current sample in two current sample wires of the second end 21,22 of the sampling cotton rope 2 is led
Line 22 directly electrically connects a connection end of the current sampling resistor 3；
C12. by another current sample in two current sample wires of the second end 21,22 of the sampling cotton rope 2
Wire 21 first attaches and is wrapped in the surface of current sampling resistor 3, then electrically connects another connection end of current sampling resistor 3；Fig. 2
In dotted portion in the current sample wire 21 that is wrapped on current sampling resistor 3 be to be blocked by current sampling resistor 3
Part；
C13. adjustment is wrapped in the canoe of the current sample wire 21 on current sampling resistor 3, in current sample
On the longitudinal section direction of resistor 3, electricity that the current sample wire 21 that is wrapped in described in order on current sampling resistor 3 is surrounded
Stream loop is equal with the size that the circular current loops in current sampling resistor 3 are each surrounded, area vector direction
On the contrary, so that two current sample wires of the second end 21,22 of the sampling cotton rope 2 are formed with current sampling resistor 3
The area vector sum that is surrounded of circular current loops be zero.
The present invention realizes sampling cotton rope 2 and the side of electrical connection of current sampling resistor 3 by first embodiment as shown in Figure 2
Case, two current sample wires of the second end 21,22 of the sampling cotton rope 2 are electrically connected the current sampling resistor 3,
And wherein a current sample wire 21, which attaches, is wrapped in the surface of current sampling resistor 3, in the vertical of current sampling resistor 3
The current loop that the current sample wire 21 being wrapped in cross-wise direction, described in order on current sampling resistor 3 is surrounded and electricity
The size that is each surrounded of circular current loops in stream sampling resistor 3 is equal, area vector is in opposite direction, makes described
Sample the circular current loops institute that two current sample wires of the second end 21,22 of cotton rope 2 are formed with current sampling resistor 3
The area vector sum surrounded is zero.
As shown in Fig. 2 when being wrapped in electric current in the current sample wire 21 on current sampling resistor 3 by LP33 extremely
During LP34 direction flowing, electric current will be by the equivalent circular current loops marked with dotted line in the current sampling resistor 3
LP30 to LP31 to LP32 direction is flowed out out of sampling cotton rope 2 another current sample wire 22, and the program presses the right side
Hand corkscrew rule can determine that the area of plane vector that the current sample wire 21 being wrapped on current sampling resistor 3 is surrounded is
Direction out of drawing to outside drawing, and the equivalent circular current loops marked in current sampling resistor 3 with dotted line are enclosed
Into area of plane vector be the direction out of drawing extroversion drawing, they are in opposite direction, and are wrapped in current sampling resistor
The area of plane that current sample wire 21 on device 3 is surrounded and the equivalent annular marked in current sampling resistor 3 with dotted line
The area of plane that current loop is surrounded is equal in magnitude, thus samples the ring that cotton rope 2 is electrically connected to form with current sampling resistor 3
The vector for the area of plane that shape circuit is surrounded is zero, so as to be produced between sampling cotton rope 2 and current sampling resistor 3
Raw induced-current.
The present invention proposes the another program used during sampling cotton rope 2 electrically connects with signal acquisition printed circuit board (PCB) 1,
I.e. described step B can also be included as follows step by step,
B21. by two current feed 11,12, mutually nothing is set on the printed circuit board 1 electrically, across；
B22. two current sample wires of first end 21,22 of the sampling cotton rope 2 are electrically connected the printing
Two current feeds 11,12 of circuit board 1, so as to the electric current being electrically connected by the order of the crosspoint of two current feeds 11,12
At least one pair of circular current loops is surrounded between sampling wire 21,22 and current feed 11,12；The circular current loops should
It is to occur in pairs, the area vector for being advantageous to make circular current loops surround and be zero；
B23. the position in the crosspoint of two current feeds 11,12, and the first end two of the sampling cotton rope 2 are adjusted
The length of root current sample wire 21,22, make the current sample wire 21,22 that is electrically connected and current feed 11,12 it
Between the size of two circular current loops that surrounds it is equal, and area vector is in opposite direction, so as to make the first end
The area vector sum that the circular current loops of two current sample wires 21,22 and two current feeds 11,12 composition are surrounded
It is zero.
The present invention realizes that sampling cotton rope 2 is electrically connected with signal acquisition printed circuit board (PCB) 1 by second embodiment as shown in Figure 3
Scheme is connect, mutually nothing is set on the printed circuit board 1 two current feed 11,12 electrically, across.The sampling cotton rope
2 two current sample wires of first end 21,22 are electrically connected two current feeds 11,12 of the printed circuit board (PCB) 1, order
By the crosspoint of two current feeds 11,12 between the current sample wire 21,22 and current feed 11,12 that are electrically connected
Two circular current loops surrounded, and the annulus area that two circular current loops are surrounded is equal in magnitude, area vector
In the opposite direction, so as to making the annular electro of described two current sample wires 21,22 of first end and two current feeds 11,12 composition
It is zero to flow back to the area vector sum that road is surrounded.
As shown in figure 3, when direction flowing of the electric current in the current sample wire 21 by LP19, electric current is at another
Flowed by LP18 direction in current sample wire 22, in two current feeds 11,12 by crosspoint in nearly signal processing chip
The direction flowing by LP17 to LP16, the program are pressed into the right-hand rule in the circular current loops that 13 sides are surrounded
Can determine that area of plane vector that current sample wire 21,22 and two current feeds 11,12 are surrounded below crosspoint be from
Direction in drawing to outside drawing, and two current feeds 11,12 are surrounded by crosspoint in the nearly side of signal processing chip 13
Area of plane vector be the direction out of drawing extroversion drawing, they are in opposite direction, and current sample wire 21,22 and two
The area of plane that current feed 11,12 is surrounded below crosspoint is with two current feeds 11,12 by crosspoint in nearly signal
The area of plane that the side of process chip 13 is surrounded is equal in magnitude, thus samples cotton rope 2 and be electrically connected with signal acquisition printed circuit board (PCB) 1
The vector for connecing the area of plane that the loop circuit to be formed is surrounded is zero, so as in sampling cotton rope 2 and signal acquisition printing electricity
Induced-current will not be produced between road plate 1.
Second embodiment of the invention, as shown in figure 3, being provided with collection signal on the signal acquisition printed circuit board (PCB) 1
Connection end point 15,16, and a wire through-hole 14.Two current feed 11,12 is by the wire through-hole 14 mutually without electrical connection
Ground, set across on the printed circuit board 1.The signal acquisition chip 13 includes two current acquisition pins 131,132.It is described
Two current feeds 11,12 are the two current feed wires for wrapping the epidermis that insulate, and the two current feeds wire is respectively electrically connected to
Between two current acquisition pins 131,132 and two collection signal connection end point 15,16 of signal acquisition chip 13, and by institute
Stating wire through-hole 14, mutually nothing is set on the printed circuit board 1 electrically, across.
Third embodiment of the invention, as shown in figure 5, one in two current feed 11,12 is to be printed on signal to adopt
Collect the printed circuit current feed on printed circuit board (PCB) 1, another is the two current feed wires for wrapping the epidermis that insulate, described
Printed circuit current feed be connected electrically in the current acquisition pin 131 of signal acquisition chip 13 and collection signal connection end point 16 it
Between, the current feed wire through the wire through-hole and printed circuit current feed without electrically, arranged in a crossed manner printing
On printed circuit board, and the current feed wire is connected electrically in the current acquisition pin of signal acquisition chip and collection signal connects
Connect between end points.
Second embodiment and 3rd embodiment are all the situations that two current feeds 11,12 intersect in wire through-hole 14.Such as
Shown in Fig. 5, a current feed 11 in two current feeds 11,12 is the printing being printed on signal acquisition printed circuit board (PCB) 1
In the case of circuital current lead, the wire through-hole 14 passes through the printed circuit current feed 11.And the present invention the 4th is implemented
Example, as shown in fig. 6, the wire through-hole 14 is arranged on the side of printing path current feed 11, another wraps insulation epidermis
Current feed wire 12 be through wire through-hole 14 after just intersect with printed circuit current feed 11.3rd embodiment and the 4th
Embodiment proposes that two kinds are different from second embodiment and realize current feed 11,12 and intersect in signal acquisition printed circuit board (PCB) 1
Scheme.
Fifth embodiment of the invention, as shown in fig. 7, proposing that another kind makes the mutual nothing of current feed 11,12 hand over electrically
Pitch the scheme set.2 collection signal connection end points 15,16, and two are provided with the signal acquisition printed circuit board (PCB) 1
Root runs through the conductive pole 151,161 of the signal acquisition printed circuit board (PCB) 1.The signal acquisition chip 13 includes two current acquisitions
Pin 131,132.Two current feed 11,12 each includes the branch line of current feed first and the branch line of current feed second.Institute
State two current feeds 11, the 12 respective branch lines of current feed first are separately positioned on the two sides of signal acquisition printed circuit board (PCB) 1,
And be connected electrically between two conductive poles 151,161 and two current acquisition pins 131,132, two the first branch lines of current feed are made without electricity
Connection ground, it is arranged in a crossed manner on the printed circuit board 1.Two current feed 11, the 12 respective branch line of current feed second difference
It is arranged on the two sides of signal acquisition printed circuit board (PCB) 1, and is connected electrically in two conductive poles 151,161 and two collection signal connection end
Point 15,16 between, make two the second branch lines of current feed without electrically, it is arranged in a crossed manner on the printed circuit board 1.So as to by two
Two current acquisition pins 131,132 of the signal acquisition chip 13 are electrically connected to the collection signal by current feed 11,12
Connection end point 15,16.Specific to fifth embodiment of the invention, as shown in fig. 7, the branch line of current feed first of current feed 11 is set
Put in the front of signal acquisition printed circuit board (PCB) 1, with depicted as solid lines, and be connected electrically in current acquisition pin 131 and conductive pole 161
Between.The branch line of current feed first of current feed 12 is arranged on the reverse side of signal acquisition printed circuit board (PCB) 1, with dotted lines,
And it is connected electrically between current acquisition pin 132 and conductive pole 151.The branch line of current feed second of current feed 11 is arranged on letter
The reverse side of number collection printed circuit board (PCB) 1, with dotted lines, and be connected electrically in collection signal connection end point 15 and conductive pole 161 it
Between.The branch line of current feed second of current feed 12 is arranged on the front of signal acquisition printed circuit board (PCB) 1, with depicted as solid lines, and
It is connected electrically between collection signal connection end point 16 and conductive pole 151.The conductive pole 151 will be separately positioned on signal acquisition print
The first branch line and the second branch line of current feed 12 on the two sides of printed circuit board 1, which are electrically connected, is connected into a complete current feed 12,
And current acquisition pin 132 is electrically connected to collection signal connection end point 16 by current feed 12.The conductive pole 161 will be respectively
First branch line of the current feed 11 being arranged on the two sides of signal acquisition printed circuit board (PCB) 1 be electrically connected with the second branch line be connected into one it is complete
Whole current feed 11, and current acquisition pin 131 is electrically connected to collection signal connection end point 15 by current feed 11.This hair
In bright 5th embodiment, two current feed 11,12 can be the two current feed wires for wrapping the epidermis that insulate, can also
It is the printed circuit current feed being printed on signal acquisition printed circuit board (PCB) 1, can also be certainly in two current feeds 11,12
One be the two current feed wires for wrapping the epidermis that insulate, another is printed on signal acquisition printed circuit board (PCB) 1
Printed circuit current feed.
The present invention proposes to use following scheme during sampling cotton rope 2 electrically connects with current sampling resistor 3, i.e., described
Step C can also be included as follows step by step,
C21. two current sample wires of the second end 21,22 of the sampling cotton rope 2 are electrically connected the electric current
Two connection ends of sampling resistor 3, described two current sample wires 21 of the second end, 22 furcations are arranged on current sample
Position away from two connection end on resistance 3, and from two current sample wires 21 of the second end, 22 furcations to two
Two sections of current sample wires 21,22 between current sample wire 21,22 and the connection end point of current sampling resistor 3 all attach
On the surface of current sampling resistor 3；
C22. adjust from two current sample wires 21 of the second end, 22 furcations to two current sample wires 21,22
The length of two sections of current sample wires 21,22 between the connection end point of current sampling resistor 3, in current sampling resistor
On 3 longitudinal section direction, electric current that the current sample wire 21,22 that is attached to described in order on current sampling resistor 3 is surrounded
Loop is equal with the circular current loops size that the current loop in current sampling resistor 3 is surrounded, area vector side
To on the contrary, making two current sample wires of the second end 21,22 and the composition of current sampling resistor 3 of the sampling cotton rope 2
The area vector sum that circular current loops are surrounded is zero.
The present invention realizes sampling cotton rope 2 and the side of electrical connection of current sampling resistor 3 by second embodiment as shown in Figure 4
Case, two current sample wires of the second end 21,22 of the sampling cotton rope 2 are electrically connected the current sampling resistor 3
Two connection ends, described two current sample wires 21 of the second end, 22 furcations are arranged on current sampling resistor 3 away from institute
State the position of two connection ends, and from two current sample wires 21 of the second end, 22 furcations to two current sample wires
21st, two sections of current sample wires 21,22 between 22 and the connection end of current sampling resistor 3 are all attached to current sampling resistor
The surface of device 3, on the longitudinal section direction of current sampling resistor 3, the electric current being attached to described in order on current sampling resistor 3 is adopted
The circular current loops that the current loop that sample wire 21,22 is surrounded is surrounded with the current loop in current sampling resistor 3
Size is equal, area vector is in opposite direction, makes two current sample wires of the second end 21,22 of the sampling cotton rope 2
The area vector sum that the circular current loops formed with current sampling resistor 3 are surrounded is zero.
Side of the electric current in the current sample wire 21 on current sampling resistor 3 by LP38 is attached to as shown in figure 4, working as
To during flowing, the electric current in another current sample wire 22 is just flowed by LP39 direction, and then in current sampling resistor 3
The direction flowing by LP37 to LP36 to LP35, the program are pressed institute by electric current in the interior equivalent circular current loops marked with dotted line
State right-hand rule and can determine that the plane face that the current sample wire 21,22 being attached on current sampling resistor 3 is surrounded
Product vector is the direction out of drawing to outside drawing, and the equivalent ring current marked in current sampling resistor 3 with dotted line
The area of plane vector that loop is surrounded is the direction out of drawing extroversion drawing, and they are in opposite direction, and are attached to electric current
Marked in the area of plane and current sampling resistor 3 that current sample wire 21,22 on sampling resistor 3 is surrounded with dotted line
The area of plane that is surrounded of equivalent circular current loops it is equal in magnitude, thus sample cotton rope 2 and be electrically connected with current sampling resistor 3
The vector for connecing the area of plane that the loop circuit to be formed is surrounded is zero, so as in sampling cotton rope 2 and current sampling resistor 3
Between will not produce induced-current.
" attaching " hereinbefore does not imply that a kind of fixed form of wire on current sampling resistor 3, but instructs
Line nestles up the state on current sampling resistor 3.
In view of the measuring instrumentss suitable for generally using, if the measuring instrumentss are the measurements for measuring electrical power
Instrument, in addition to the voltage sample wire being connected electrically between the signal acquisition printed circuit board (PCB) 1 and current sampling resistor 3
23, two current sample wires 21,22, and helically ring-type is closely twisted into one and had voltage sample wire 23
The sampling cotton rope 2 of first end and the second end, i.e. voltage sample wire 23 be stranded in sampling cotton rope 2 in, and with two electricity
Helically ring-type closely twists together stream sampling wire 21,22.Namely voltage sample wire 23 can be with current sample
Wire is twisted together, is had no effect on current sample wire spiral ring part and is realized the scheme that area vector is zero.
Claims (10)
1. a kind of measuring instrumentss with current sample module not influenceed by alternation external magnetic field, including signal acquisition printed circuit
Plate (1), current sampling resistor (3) made of manganese copper alloy material, and it is connected electrically in the signal acquisition printed circuit
Two current sample wires (21,22) between plate (1) and current sampling resistor (3)；The signal acquisition printed circuit board (PCB)
(1) signal processing chip (13) and two current feeds (11,12) are included；By two current feed (11,12) by signal
Reason chip (13) electrically connects with two current sample wires (21,22)；It is characterized in that：
Helically ring-type is closely alternately twisted into one and has first end and the two current sample wires (21,22)
The sampling cotton rope (2) of two ends；
Two current sample wires of first end (21,22) of the sampling cotton rope (2) electrically connect the signal acquisition printing electricity
Road plate (1), the ring current for making two current sample wires of the first end (21,22) be formed with two current feeds (11,12)
The area vector sum that loop is surrounded is zero；
Two current sample wires of the second end (21,22) of the sampling cotton rope (2) electrically connect the current sampling resistor
(3) ring for, making the current loop of two current sample wires of the second end (21,22) and current sampling resistor (3) form
The area vector sum that shape current loop is surrounded is zero；
The area vector refers to the directive area of plane of tool surrounded by circular current loops, the direction of the area vector
The sense of current according to the circular current loops for surrounding plane determines；
Mutually nothing is arranged on signal acquisition printed circuit board (PCB) (1) two current feed (11,12) electrically, across；
Two current sample wires of first end (21,22) of the sampling cotton rope (2) are electrically connected the signal acquisition print
Two current feeds (11,12) of printed circuit board (1), make the current sample wire (21,22) and current feed being electrically connected
Between (11,12) at least one pair of circular current loops, and the annular are surrounded by the crosspoint of two current feeds (11,12)
The annulus area that current loop is surrounded is equal in magnitude, and area vector is in opposite direction, so as to make described two electric currents of first end
The area vector sum that the circular current loops of sampling wire (21,22) and two current feeds (11,12) composition are surrounded is zero.
2. the measuring instrumentss with current sample module according to claim 1 not influenceed by alternation external magnetic field, it is special
Sign is：
The direction of the area vector is determined by right-hand rule, i.e., is clenched fist with the right hand, thumb central axis is by other four
Refer to around and the thumb cylindrical coordinate system that fist overhangs and formed to the right based on, when the right hand it is other four refer to press annular electro
When the sense of current flowed back in road is clenched fist, the sensing of thumb is exactly the direction for the area vector that circular current loops are surrounded.
3. the measuring instrumentss with current sample module according to claim 1 not influenceed by alternation external magnetic field, it is special
Sign is：
2 collection signal connection end points (15,16) are provided with the signal acquisition printed circuit board (PCB) (1), and a wire leads to
Hole (14)；Two current feed (11,12) is arranged on signal electrically, across by the mutual nothing of the wire through-hole (14) and adopted
Collect on printed circuit board (PCB) (1)；The signal processing chip (13) includes two current acquisition pins (131,132)；
Two current feed (11,22) is the two current feed wires for wrapping the epidermis that insulate, the two current feeds wire point
Be not connected electrically in the two current acquisition pins (131,132) of signal processing chip (13) and 2 collection signal connection end points (15,
16) between, and mutually nothing is arranged on signal acquisition printed circuit board (PCB) electrically, across by the wire through-hole (14)
(1) on；
Or one in two current feed (11,12) is the printing electricity being printed on signal acquisition printed circuit board (PCB) (1)
Road current feed, another is the two current feed wires for wrapping the epidermis that insulate, and printed circuit current feed is connected electrically in letter
Between the current acquisition pin (131) and collection signal connection end point (16) of number process chip (13), the current feed wire
Through the wire through-hole (14) and printed circuit current feed without electrically, it is arranged in a crossed manner in signal acquisition printed circuit board (PCB)
(1) on, and the current feed wire is connected electrically in the current acquisition pin (132) of signal processing chip (13) and collection is believed
Between number connection end point (15).
4. the measuring instrumentss with current sample module according to claim 1 not influenceed by alternation external magnetic field, it is special
Sign is：
2 collection signal connection end points (15,16) are provided with the signal acquisition printed circuit board (PCB) (1), and two run through
The conductive pole (151,161) of the signal acquisition printed circuit board (PCB) (1)；The signal processing chip (13) includes two current acquisitions
Pin (131,132)；
Two current feed (11,12) each includes the branch line of current feed first and the branch line of current feed second；
The respective branch line of current feed first of two current feed (11,12) is separately positioned on signal acquisition printed circuit board (PCB)
(1) on two sides, and it is connected electrically between two conductive poles (151,161) and two current acquisition pins (131,132), makes two electric currents
The branch line of lead first without electrically, it is arranged in a crossed manner on signal acquisition printed circuit board (PCB) (1)；Two current feed (11,
12) the respective branch line of current feed second is separately positioned on the two sides of signal acquisition printed circuit board (PCB) (1), and is connected electrically in two
Between conductive pole (151,161) and 2 collection signal connection end points (15,16), two the second branch lines of current feed are made without electrical connection
It is ground, arranged in a crossed manner on signal acquisition printed circuit board (PCB) (1)；So as to by two current feeds (11,12) by the signal transacting
The two current acquisition pins (131,132) of chip (13) are electrically connected to the collection signal connection end point (15,16)；
Two current feed (11,12) is the two current feed wires for wrapping the epidermis that insulate, or, two current feed
(11,12) are the printed circuit current feeds being printed on signal acquisition printed circuit board (PCB) (1).
5. the measuring instrumentss with current sample module according to claim 1 not influenceed by alternation external magnetic field, it is special
Sign is：
Two current sample wires of the second end (21,22) of the sampling cotton rope (2) are electrically connected the current sample electricity
Device (3) is hindered, and a wherein current sample wire (21) attaches and is wrapped in current sampling resistor (3) surface, is adopted in electric current
On the longitudinal section direction of sample resistor (3), current sample wire (21) institute for being wrapped in described in order on current sampling resistor (3)
The current loop surrounded is equal with the size that the circular current loops in current sampling resistor (3) are each surrounded, face
Product direction vector is on the contrary, make two current sample wires of the second end (21,22) and current sample electricity of the sampling cotton rope (2)
The area vector sum that the circular current loops that resistance device (3) is formed are surrounded is zero.
6. the measuring instrumentss with current sample module according to claim 1 not influenceed by alternation external magnetic field, it is special
Sign is：
Two current sample wires of the second end (21,22) of the sampling cotton rope (2) are electrically connected the current sample electricity
Two connection ends of device (3) are hindered, two current sample wires of the second end (21,22) furcation is arranged on current sampling resistor
Position away from two connection end on device (3), and from two current sample wires of the second end (21,22) furcation to two
Two sections of current sample wires (21,22) between root current sample wire (21,22) and the connection end of current sampling resistor (3)
Current sampling resistor (3) surface is all attached to, on the longitudinal section direction of current sampling resistor (3), is attached to described in order
In the current loop and current sampling resistor (3) that current sample wire (21,22) on current sampling resistor (3) is surrounded
The circular current loops size that is surrounded of current loop is equal, area vector is in opposite direction, make the sampling cotton rope (2)
The circular current loops that are formed with current sampling resistor (3) of two current sample wires of the second end (21,22) surrounded
Area vector sum be zero.
7. the measuring instrumentss with current sample module according to claim 1 not influenceed by alternation external magnetic field, it is special
Sign is：
The measuring instrumentss are for measuring the measuring instrumentss of electrical power, in addition to are connected electrically in the signal acquisition printed circuit
Voltage sample wire (23) between plate (1) and current sampling resistor (3), two current sample wires (21,22), with
And helically ring-type is closely twisted into a sampling cotton rope with first end and the second end to voltage sample wire (23)
(2), i.e., voltage sample wire (23) is stranded in sampling cotton rope (2), and with two current sample wires (21,22) helically
Ring-type closely twists together.
8. a kind of method for making the measuring instrumentss with current sample module not influenceed by alternation external magnetic field, the measuring instrumentss bag
Signal acquisition printed circuit board (PCB) (1), current sampling resistor (3) are included, and is connected electrically in the signal acquisition printed circuit board (PCB)
(1) two current sample wires (21,22) between current sampling resistor (3)；The signal acquisition printed circuit board (PCB) (1)
Including signal processing chip (13) and two current feeds (11,12)；By two current feed (11,12) by signal transacting core
Piece (13) electrically connects with two current sample wires (21,22)；It is characterized in that methods described comprises the following steps：
A. by two current sample wires (21,22), helically ring-type is closely alternately twisted into one and has first end and the
The sampling cotton rope (2) of two ends；
B. two current sample wires of first end (21,22) of the sampling cotton rope (2) are electrically connected into the signal acquisition to print
Printed circuit board (1), the circular current loops for setting current sample wire (21,22) and current feed (11,12) to be surrounded, order should
What the circular current loops of two current sample wires of first end (21,22) and two current feeds (11,12) composition were surrounded
Area vector sum is zero；
C. two current sample wires of the second end (21,22) of the sampling cotton rope (2) are electrically connected into the current sample electricity
Device (3) is hindered, current loop path when setting current sample wire (21,22) electrically connects with current sampling resistor (3), order should
The ring current that two current sample wires of the second end (21,22) are formed with the current loop in current sampling resistor (3)
The area vector sum that loop is surrounded is zero；
The step B is included as follows step by step,
B21. by two current feed (11,12), mutually nothing is arranged on signal acquisition printed circuit board (PCB) (1) electrically, across
On；
B22. two current sample wires of first end (21,22) of the sampling cotton rope (2) are electrically connected the signal
Two current feeds (11,12) of printed circuit board (PCB) (1) are gathered, so as to be electrically connected by the order of the crosspoint of two current feeds (11,12)
At least one pair of circular current loops is surrounded between the current sample wire (21,22) and current feed (11,12) that are connected together；
B23. the position in the crosspoint of two current feeds (11,12), and the first end two of the sampling cotton rope (2) are adjusted
The length of current sample wire (21,22), make the current sample wire (21,22) that is electrically connected and current feed (11,
12) size of two circular current loops surrounded between is equal, and area vector is in opposite direction, so as to make described first
The area that the circular current loops of the current sample wire of end two (21,22) and two current feeds (11,12) composition are surrounded
Vector sum is zero.
9. the side that measuring instrumentss of the order with current sample module according to claim 8 are not influenceed by alternation external magnetic field
Method, it is characterised in that：
The step C is included as follows step by step,
C11. a current sample in two current sample wires of the second end (21,22) of the sampling cotton rope (2) is led
Line (22) directly electrically connects a connection end of the current sampling resistor (3)；
C12. by another current sample in two current sample wires of the second end (21,22) of the sampling cotton rope (2)
Wire (21) first attaches and is wrapped in current sampling resistor (3) surface, then electrically connects another connection of current sampling resistor (3)
End；
B13. adjustment is wrapped in the canoe of the current sample wire (21) on current sampling resistor (3), in current sample
On the longitudinal section direction of resistor (3), the current sample wire (21) being wrapped in described in order on current sampling resistor (3) is enclosed
Into current loop is equal with the size that the circular current loops in current sampling resistor (3) are each surrounded, area
Direction vector is on the contrary, so that two current sample wires of the second end (21,22) and current sample of the sampling cotton rope (2)
The area vector sum that the circular current loops that resistor (3) is formed are surrounded is zero.
10. the side that measuring instrumentss of the order with current sample module according to claim 8 are not influenceed by alternation external magnetic field
Method, it is characterised in that：
The step C is included as follows step by step,
C21. two current sample wires of the second end (21,22) of the sampling cotton rope (2) are electrically connected the electric current
Two connection ends of sampling resistor (3), two current sample wires of the second end (21,22) furcation is arranged on electric current
Position away from two connection end on sampling resistor (3), and from two current sample wires of the second end (21,22) bifurcated
Portion to two sections of current samples between two current sample wires (21,22) and the connection end point of current sampling resistor (3) are led
Line (21,22) is all attached to current sampling resistor (3) surface；
C22. adjust from two current sample wires of the second end (21,22) furcation to two current sample wires (21,22)
The length of two sections of current sample wires (21,22) between the connection end point of current sampling resistor (3), in current sample electricity
On the longitudinal section direction for hindering device (3), current sample wire (21,22) institute for being attached to described in order on current sampling resistor (3)
The circular current loops size phase that the current loop surrounded is surrounded with the current loop in current sampling resistor (3)
Deng, area vector is in opposite direction, make it is described sampling cotton rope (2) two current sample wires of the second end (21,22) and electric current
The area vector sum that the circular current loops that sampling resistor (3) is formed are surrounded is zero.
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| TW200428454A (en) * | 2003-03-14 | 2004-12-16 | Matsushita Electric Ind Co Ltd | Electron injection current measuring apparatus and electron injection current measuring method using the same |
| CN102323459B (en) * | 2011-08-12 | 2013-10-23 | 桐乡市伟达电子有限公司 | Alternating magnetic field-resistant manganin current divider |
| CN202305613U (en) * | 2011-10-28 | 2012-07-04 | 钜泉光电科技(上海)股份有限公司 | Manganin electric energy meter |
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