CN109613321A - The current measuring method and device of copper bar type conducting wire - Google Patents
The current measuring method and device of copper bar type conducting wire Download PDFInfo
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- CN109613321A CN109613321A CN201811457286.0A CN201811457286A CN109613321A CN 109613321 A CN109613321 A CN 109613321A CN 201811457286 A CN201811457286 A CN 201811457286A CN 109613321 A CN109613321 A CN 109613321A
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 148
- 239000010949 copper Substances 0.000 title claims abstract description 148
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000012545 processing Methods 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 5
- 238000000691 measurement method Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 17
- 230000006698 induction Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/205—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using magneto-resistance devices, e.g. field plates
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses the current measuring method and device of copper bar type conducting wire, one of method includes: that through-hole is arranged at the middle part of copper bar type conducting wire to be measured；The first magnetic sensing unit, the second magnetic sensing unit is respectively set in first position, the second position of through-hole side wall, and in the longitudinal direction of copper bar type conducting wire longitudinal section shape to be measured, first position and the second position are not overlapped；The longitudinal section shape of copper bar type conducting wire to be measured is rectangle or round rectangle；The magnetic susceptibility direction of magnetic sensing unit is parallel with the extending direction of the short side of longitudinal section shape；Obtain the output valve of the first magnetic sensing unit and the second magnetic sensing unit；The electric current of copper bar type conducting wire to be measured is obtained according to the output valve of the first magnetic sensing unit and the second magnetic sensing unit.Through the invention, for current measurement value not vulnerable to the influence of power frequency, the frequency scope of application is wider, has preferable frequency characteristic, thus measurement result is more accurate.
Description
Technical field
The present invention relates to current sensing techniques fields, and in particular to the current measuring method and device of copper bar type conducting wire.
Background technique
As shown in Figure 1A, it is rectangle or circle that copper bar type conducting wire, which is a kind of longitudinal cross-section (i.e. the section vertical with current direction),
The flat electrical connector of angular moment shape, the copper bar type conducting wire in the application are not limited to be also possible to other materials using copper material
Matter.The single flow area of copper bar type conducting wire is larger thus dynamic stability and thermal stability are all better than cable, therefore is widely used in
The electro-engineerings such as high and low voltage electrical equipment, switch contact, controller switching equipment, bus duct are also widely used in metal smelt, electrification plating, change
The super-large currents electrolysis for production engineering such as work caustic soda.In general, current capacity will use copper bar type when meeting or exceeding 250A
Conducting wire imports or derived current.
Existing current measuring device is often only applicable to the current measurement of circular cross-section (such as steel-cored aluminium strand), and due to copper
That there are shapes is special for row's type conducting wire, load current is larger, irregular (the position magnetic induction intensity having is special for induced magnetic field distribution
It is weak, it is difficult to observe) the characteristics of, traditional current measure device often can not accurately measure its electric current, especially when copper bar type
When passing to the electric current of different frequency inside conducting wire.
Summary of the invention
In view of this, the embodiment of the invention provides the current measuring method and device of copper bar type conducting wire, to solve to work as copper
When passing to the electric current of different frequency inside row's type conducting wire, the problem of existing method can not accurately measure its electric current.
According in a first aspect, the embodiment of the invention provides a kind of current measuring methods of copper bar type conducting wire, comprising: to
Through-hole is arranged in the middle part for surveying copper bar type conducting wire；The first magnetic is respectively set in first position, the second position of the through-hole side wall to pass
Feel unit, the second magnetic sensing unit, and in the longitudinal direction of the copper bar type conducting wire longitudinal section shape to be measured, described first
Position and the second position are not overlapped；The longitudinal section shape of the copper bar type conducting wire to be measured is rectangle or round rectangle；Institute
The magnetic susceptibility direction for stating magnetic sensing unit is parallel with the extending direction of the short side of the longitudinal section shape；Obtain described first
The output valve of magnetic sensing unit and the second magnetic sensing unit；It is sensed according to the first magnetic sensing unit and second magnetic
The output valve of unit obtains the electric current of the copper bar type conducting wire to be measured.
According to second aspect, the embodiment of the invention provides a kind of current measuring methods of copper bar type conducting wire, comprising: to
Through-hole is arranged in the middle part for surveying copper bar type conducting wire；The first magnetoelectricity is respectively set in first position, the second position of the through-hole side wall
Resistance, the second magneto-resistor, and in the longitudinal direction of the copper bar type conducting wire longitudinal section shape to be measured, the first position and institute
The second position is stated not to be overlapped；The longitudinal section shape of the copper bar type conducting wire to be measured is rectangle or round rectangle；First magnetic
The magnetic susceptibility direction of resistance and second magneto-resistor is parallel with the extending direction of the short side of the longitudinal section shape, and institute
It is identical with the magnetic susceptibility direction of second magneto-resistor to state the first magneto-resistor；First magneto-resistor and the second magneto-resistor string
Connection, the both ends after series connection are separately connected both ends of power；Obtain the voltage between first magneto-resistor and second magneto-resistor
Value；The electricity of the copper bar type conducting wire to be measured is obtained according to the voltage value between first magneto-resistor and second magneto-resistor
Stream.
According to the third aspect, the embodiment of the invention provides a kind of current measuring methods of copper bar type conducting wire, comprising: to
Through-hole is arranged in the middle part for surveying copper bar type conducting wire；In the first position of the through-hole side wall, the second position, the first magneto-resistor, the are set
Two magneto-resistors, third magneto-resistor, the 4th magneto-resistor, wherein shown first magneto-resistor and the 4th magneto-resistor are set to described first
Position, second magneto-resistor and the third magneto-resistor are set to the second position；And in the copper bar type conducting wire to be measured
In the longitudinal direction of longitudinal section shape, the first position and the second position are not overlapped；It is first magneto-resistor, described
Second magneto-resistor, the third magneto-resistor, the magnetic susceptibility direction of the 4th magneto-resistor are identical, and with the longitudinal section shape
Short side extending direction it is parallel；The longitudinal section shape of the copper bar type conducting wire to be measured is rectangle or round rectangle；Described
One magneto-resistor and second magneto-resistor series connection, both ends after series connection connect both ends of power, the third magneto-resistor and described the
The series connection of four magneto-resistors, the both ends after series connection connect the both ends of power, wherein first magneto-resistor and the third magneto-resistor
Connect same power end；The first voltage value between first magneto-resistor and second magneto-resistor is obtained, and described in acquisition
Second voltage value between third magneto-resistor and the 4th magneto-resistor；According to the first voltage value and the second voltage value
Difference obtain the electric current of the copper bar type conducting wire to be measured.
Optionally, in method described in first aspect, second aspect or the third aspect, the first position and/or described
Where the second position is located at it on line at two short side midpoints of longitudinal section shape.
According to fourth aspect, the embodiment of the invention provides a kind of current measuring device of copper bar type conducting wire, copper bars to be measured
Through-hole is provided in the middle part of type conducting wire；Described device includes: the first magnetic sensing unit, the second magnetic sensing unit, is separately positioned on
First position, the second position of the through-hole side wall, and in the longitudinal direction of the copper bar type conducting wire longitudinal section shape to be measured
On, the first position and the second position are not overlapped；The longitudinal section shape of the copper bar type conducting wire to be measured be rectangle or
Round rectangle；The magnetic susceptibility direction of the magnetic sensing unit is parallel with the extending direction of the short side of the longitudinal section shape；
Signal processing module, for obtaining the output of the first magnetic sensing unit and the second magnetic sensing unit, and according to described
The electric current that the output valve of first magnetic sensing unit and the second magnetic sensing unit obtains the copper bar type conducting wire to be measured obtains institute
State the electric current of copper bar type conducting wire to be measured.
According to the 5th aspect, the embodiment of the invention provides a kind of current measuring device of copper bar type conducting wire, feature exists
In being provided with through-hole in the middle part of copper bar type conducting wire to be measured；Described device includes: the first magneto-resistor, the second magneto-resistor, is respectively set
First position, the second position in the through-hole side wall, and in the long side side of the copper bar type conducting wire longitudinal section shape to be measured
Upwards, the first position and the second position are not overlapped；The longitudinal section shape of the copper bar type conducting wire to be measured is rectangle
Or round rectangle；The magnetic susceptibility direction of first magneto-resistor and second magneto-resistor is short with the longitudinal section shape
The extending direction on side is parallel, and first magneto-resistor is identical with the magnetic susceptibility direction of second magneto-resistor；First magnetic
Resistance and second magneto-resistor series connection, the both ends after series connection are separately connected both ends of power；Signal processing module, for obtaining
The voltage value between the first magneto-resistor and second magneto-resistor is stated, and according to first magneto-resistor and second magneto-resistor
Between voltage value obtain the electric current of the copper bar type conducting wire to be measured.
According to the 6th aspect, the embodiment of the invention provides a kind of current measuring device of copper bar type conducting wire, copper bars to be measured
Through-hole is provided in the middle part of type conducting wire；Described device includes: the first magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magnetoelectricity
Resistance, is separately positioned on first position, the second position of the through-hole side wall, wherein shown first magneto-resistor and the 4th magneto-resistor
It is set to the first position, second magneto-resistor and the third magneto-resistor are set to the second position；And described
In the longitudinal direction of copper bar type conducting wire longitudinal section shape to be measured, the first position and the second position are not overlapped；It is described
First magneto-resistor, second magneto-resistor, the third magneto-resistor, the magnetic susceptibility direction of the 4th magneto-resistor are identical, and with
The extending direction of the short side of the longitudinal section shape is parallel；The longitudinal section shape of the copper bar type conducting wire to be measured be rectangle or
Round rectangle；First magneto-resistor and second magneto-resistor series connection, the both ends after series connection connect both ends of power, the third
Magneto-resistor and the 4th magneto-resistor series connection, both ends after series connection connect the both ends of power, wherein first magneto-resistor and
The third magneto-resistor connects same power end；Signal processing module, for obtaining first magneto-resistor and second magnetic
The first voltage value between resistance, and the second voltage value between the third magneto-resistor and the 4th magneto-resistor is obtained, and
The electric current of the copper bar type conducting wire to be measured is obtained according to the difference of the first voltage value and the second voltage value.
Optionally, in device described in fourth aspect, the 5th aspect or the 6th aspect, the first position and/or described
Where the second position is located at it on line at two short side midpoints of longitudinal section shape.
The current measuring method and device of copper bar type conducting wire provided by the embodiment of the present invention, measured value is not vulnerable to electric current
The influence of frequency, the frequency scope of application is wider, has preferable frequency characteristic, thus measurement result is more accurate.
Detailed description of the invention
The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, and attached drawing is schematically without that should manage
Solution is carries out any restrictions to the present invention, in the accompanying drawings:
Figure 1A shows the structural schematic diagram of copper bar type conducting wire；
Figure 1B shows the Distribution of Magnetic Field schematic diagram around the copper bar type conducting wire of energization；
Fig. 1 C shows a kind of stereoscopic schematic diagram that through-hole is provided in the middle part of copper bar type conducting wire to be measured；
Fig. 1 D shows the top view of copper bar type conducting wire to be measured shown in Fig. 1 C；
Fig. 1 E is shown when being provided with through-hole in the middle part of copper bar type conducting wire to be measured, crosses the magnetic field point on the longitudinal cross-section of through-hole
Cloth schematic diagram；
Fig. 2A shows a kind of flow chart of the current measuring method of copper bar type conducting wire according to an embodiment of the present invention；
Fig. 2 B shows another top view when being provided with through-hole in the middle part of copper bar type conducting wire to be measured；
Fig. 2 C and Fig. 2 D, which are shown, respectively illustrates first position and the second position in copper bar type conducting wire longitudinal cross-section to be measured
Longitudinal direction on schematic diagram when not being overlapped, being overlapped；
Fig. 2 E shows the frequency characteristic schematic diagram of the current measuring method of copper bar type conducting wire according to an embodiment of the present invention；
Fig. 3 A shows two short side midpoint lines one of first position and the second position longitudinal section shape where it
Schematic diagram when side；
Fig. 3 B shows first position and the second position where it on two short side midpoint lines of longitudinal section shape
When schematic diagram；
Fig. 4 A shows the flow chart of the current measuring method of another copper bar type conducting wire according to an embodiment of the present invention；
Fig. 4 B shows a kind of electrical connection of two magneto-resistors；
Fig. 4 C shows a kind of electrical connection schematic diagram of operational amplifier suitable for Fig. 4 C；
Fig. 5 A shows the flow chart of the current measuring method of another copper bar type conducting wire according to an embodiment of the present invention；
Fig. 5 B shows a kind of electrical connection of four magneto-resistors；
Fig. 5 C shows a kind of electrical connection schematic diagram of operational amplifier suitable for Fig. 5 B.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Distribution of Magnetic Field around the copper bar type conducting wire of energization is as shown in Figure 1B, and wherein A indicates the copper bar type conducting wire being powered
Longitudinal cross-section, dotted line indicate magnetic induction line.Inventors have found that opening up through-hole (such as Fig. 1 C and a figure in the middle part of copper bar type conducting wire
Shown in 1D, wherein Fig. 1 C is the three-dimensional structure diagram of copper bar type conducting wire, and wherein arrow indicates the flow direction of electric current, and Fig. 1 D is shown in Fig. 1 C
The top view of copper bar type conducting wire) after, cross Distribution of Magnetic Field on the longitudinal cross-section of through-hole as referring to figure 1E, wherein triangle arrow
Indicate the magnetic direction at present position.Inventor to first position on through-hole side wall (i.e. location A in Fig. 1 C or Fig. 1 D) and
The magnetic induction intensity rule of the second position (i.e. B location in Fig. 1 C or Fig. 1 D) is studied, and is found: with copper bar type to be measured
The magnetic induction intensity of the variation of the power frequency to be circulated in conducting wire, first position A and the second position B institute after predetermined operation
The variable quantity of the numerical value obtained is smaller (i.e. the current measuring method has preferable frequency characteristic), wherein leads in copper bar type to be measured
In the longitudinal direction of line longitudinal section shape, first position A and second position B are not overlapped.
Based on above-mentioned discovery, the current measuring method and device of copper bar type conducting wire described herein are inventors herein proposed,
Application scheme is described in detail below.
It needs to illustrate in advance, the magnetic susceptibility direction in the application is direction vector, has both included " when the magnetic field of the direction
When increase, the direction (also referred to as positive magnetic susceptibility direction) of the positive output value increase of magneto sensor ", also include " when the magnetic field of the direction
When increase, the direction (also referred to as negative magnetic susceptibility direction) of the positive output value reduction of magneto sensor ".
Also arrange in the application: when only referring to magnetic susceptibility direction, which had not only included positive magnetic susceptibility direction, but also
Including negative magnetic susceptibility direction, positive and negative direction is not distinguished；And when referring to that magnetic susceptibility direction is identical, opposite, distinguish positive magnetosensitive
Feel direction, negative magnetic susceptibility direction, namely " magnetic susceptibility direction is identical " refers to that magnetic susceptibility direction is positive and magnetic susceptibility direction or be
Negative magnetic susceptibility direction, " magnetic susceptibility is contrary " refer to that be positive magnetic susceptibility direction, another one of one is negative magnetic susceptibility direction.
Embodiment one
Fig. 2A shows a kind of flow chart of the current measuring method of copper bar type conducting wire according to an embodiment of the present invention.Such as figure
Shown in 2A, this method comprises the following steps:
S101: through-hole is set at the middle part of copper bar type conducting wire to be measured.
Fig. 1 C and Fig. 1 D give from stereochemical structure angle and depression angle set in the middle part of copper bar type conducting wire to be measured respectively
Set the schematic diagram of through-hole.It should be noted that the shape of through-hole can be rectangular or square as shown in figure iD, it is also possible to
The circle as shown in Fig. 2 B to Fig. 2 D or other shapes, the application to the shape of through-hole without limitation.
S102: it is single that the first magnetic sensing unit, the second magnetic sensing is respectively set in first position, the second position of through-hole side wall
Member, and in the longitudinal direction of copper bar type conducting wire longitudinal section shape to be measured, first position and the second position are not overlapped；Copper to be measured
The longitudinal section shape of row's type conducting wire is rectangle or round rectangle；The magnetic susceptibility direction of magnetic sensing unit is and longitudinal section shape
Short side extending direction it is parallel.
In Fig. 1 C and Fig. 1 D and Fig. 2 B and Fig. 2 C, first position A and second position B are longitudinal in copper bar type conducting wire to be measured
It is not overlapped in the longitudinal direction of cross sectional shape, Fig. 2 D shows first position A and second position B is weighed in the long side direction
The schematic diagram of conjunction.
Magnetic sensing unit in the application can be single magneto-resistor, be also possible to multiple magneto-resistors, or suddenly
That sensor or the unit that can sense magnetic induction intensity similar with Hall sensor.
S103: the output valve of the first magnetic sensing unit and the second magnetic sensing unit is obtained.
S104: the electricity of copper bar type conducting wire to be measured is obtained according to the output valve of the first magnetic sensing unit and the second magnetic sensing unit
Stream.
According to the above-mentioned discovery of inventor, with the variation of the power frequency to be circulated in copper bar type conducting wire to be measured, first
Smaller (i.e. current measurement of variable quantity of the magnetic induction intensity of position A and second position B resulting numerical value after predetermined operation
Method has preferable frequency characteristic), therefore, the current measuring method of copper bar type conducting wire provided by the embodiment of the present invention,
For measured value not vulnerable to the influence of power frequency, the frequency scope of application is wider, have preferable frequency characteristic, thus measurement result compared with
It is accurate.
Inventor has also carried out the research of frequency characteristic to the current measuring method of copper bar type conducting wire provided by the invention, tool
Body method are as follows: pass to 1Hz electric current to copper bar type conducting wire to be measured, and be worth on the basis of measurement result at this time；Incrementally increase electric current
Frequency, obtain measurement result respectively, and the measurement result after measurement result is normalized divided by a reference value.The research knot
Fruit is as shown in Figure 2 E, it can be seen from the figure that pass in the copper bar type conducting wire to be measured frequency be 100Hz or so and 100Hz with
Under electric current when, measurement result hardly becomes.Therefore, the current measuring method of copper bar type conducting wire provided by the invention not vulnerable to
The influence of power frequency, the frequency scope of application is wider, has preferable frequency characteristic.
Optionally, where above-mentioned first position A and/or second position B is located at it in two short sides of longitudinal section shape
On the line of point.For example, Fig. 3 A and Fig. 3 B show the vertical of copper bar type conducting wire to be measured in Fig. 1 C or Fig. 1 D or Fig. 2 B to Fig. 2 D
To schematic cross-section, as shown in the PP ' line in figure, which passes through through-hole for the position of the longitudinal cross-section.Wherein, it is respectively used to
The first magnetic sensing unit, the first position A of the second magnetic sensing unit, second position B, which is arranged, can be longitudinal where it cut
On the short side midpoint line OO ' in face (as shown in Figure 3B), the side (as shown in Figure 3A) of line OO ' can also be located at.Work as position
When on the line OO ' of short side midpoint, due to magnetic induction intensity relative to the distribution of Magnetic Sensor more uniform, measurement result
It can be more accurate.
Embodiment two
Fig. 4 A shows the flow chart of the current measuring method of another copper bar type conducting wire according to an embodiment of the present invention.Such as
Shown in Fig. 4 A, this method comprises the following steps:
S201: through-hole is set at the middle part of copper bar type conducting wire to be measured.
S202: being respectively set the first magneto-resistor, the second magneto-resistor in first position, the second position of through-hole side wall, and
In the longitudinal direction of copper bar type conducting wire longitudinal section shape to be measured, first position and the second position are not overlapped；Copper bar type to be measured is led
The longitudinal section shape of line is rectangle or round rectangle；The magnetic susceptibility direction of first magneto-resistor and the second magneto-resistor is cut with longitudinal
The extending direction of the short side of face shape is parallel, and the first magneto-resistor is identical with the magnetic susceptibility direction of the second magneto-resistor；First magnetoelectricity
Resistance and the series connection of the second magneto-resistor, the both ends after series connection are separately connected both ends of power.
S203: the voltage value between the first magneto-resistor and the second magneto-resistor is obtained.
S204: the electric current of copper bar type conducting wire to be measured is obtained according to the voltage value between the first magneto-resistor and the second magneto-resistor.
As shown in Fig. 3 A (or Fig. 3 B), A, B expression are respectively used to setting the first magneto-resistor of magnetic sensing unit, the second magnetoelectricity
The first position and the second position of resistance, first position, being specifically defined for the second position refer to embodiment one.The embodiment and reality
The difference for applying example one is that the first magneto-resistor 41, the second magneto-resistor 42 is respectively set in A, second position B in first position, this
One magneto-resistor 41 is identical with the magnetic susceptibility direction of the second magneto-resistor 42 (as shown in the arrow in Fig. 3 A or 3B), and with long side
Direction is parallel；As shown in Figure 4 B, the first magneto-resistor 41 and the series connection of the second magneto-resistor 42, the both ends after series connection are separately connected power supply two
End.
In conjunction with Fig. 1 E, it is assumed that the resistance value of the first magneto-resistor 41 is R1=R0+k·B1, wherein R0Exist for the first magneto-resistor 41
Resistance value when magnetic induction intensity is zero, B1For the magnetic induction intensity where the first magneto-resistor 41, k is the change of the first magneto-resistor 41
Rate；The resistance value of second magneto-resistor 42 is R2=R0+k·B2, wherein R0For the second magneto-resistor 42 when magnetic induction intensity is zero
Resistance value (when magnetic induction intensity is zero, the resistance value of the first magneto-resistor 41 and the second magneto-resistor 42 is equal), B2For the second magneto-resistor 42
Magnetic induction intensity at place, k are the change rate of the second magneto-resistor 42.So, the first magneto-resistor 41 and the second magneto-resistor 42 it
Between the voltage that exports be
Wherein, VccFor supply voltage.
When copper bar type conducting wire to be measured does not pass to electric current, the voltage between the first magneto-resistor 41 and the second magneto-resistor 42 is answered
For V0=Vcc/2.So before and after energization, the difference of output voltage between the first magneto-resistor 41 and the second magneto-resistor 42 are as follows:
It should be noted that in the final step that above-mentioned formula (1) derives, due to R under actual conditions0Numerical value it is often remote
Much larger than B1And B2Numerical value, thus k (B1+B2) it can be approximated to be 0, to obtain the final result of above-mentioned formula (1).
It can be seen that before and after energization according to the final result of above-mentioned formula (1), the first magneto-resistor 41 and the second magneto-resistor
The difference of output voltage and the first magneto-resistor 41, the difference of 42 position magnetic induction intensity of the second magneto-resistor are at just between 42
Than.Therefore, when being powered according to copper bar type conducting wire to be measured between first magneto-resistor 41 and the second magneto-resistor 42 voltage value that exports with
The difference of reference value (reference value can be chosen for the half of supply voltage value, or may be other fixed numbers), can
Obtain the electric current of copper bar type conducting wire to be measured.
The current measuring method of copper bar type conducting wire provided by the embodiment of the present invention, measured value is not vulnerable to power frequency
It influencing, the frequency scope of application is wider, there is preferable frequency characteristic, thus measurement result is more accurate.Specifically refer to implementation
Example one.
Above-mentioned steps S203 and S204 can be executed using operational amplifier and its peripheral circuit, as shown in Figure 4 C,
Middle VoVoltage when being powered for copper bar type conducting wire to be measured between first magneto-resistor 41 and the second magneto-resistor 42, VrefIt can be set to
The half of supply voltage value, i.e. Vcc/2.Above-mentioned steps S203 and S204 can also be held using including the module of processor chips
Row, or it is also possible to other electronic circuits to execute, the application is without limitation.
Optionally, where above-mentioned first position A and/or second position B is located at it in two short sides of longitudinal section shape
On the line of point, so that measurement result is more accurate.Specifically refer to the optional embodiment of embodiment one.
Embodiment three
Fig. 5 A shows the flow chart of the current measuring method of another copper bar type conducting wire according to an embodiment of the present invention.Such as
Shown in Fig. 5 A, this method comprises the following steps:
S301: through-hole is set at the middle part of copper bar type conducting wire to be measured.
S302: the first magneto-resistor, the second magneto-resistor, third magnetoelectricity are set in first position, the second position of through-hole side wall
Resistance, the 4th magneto-resistor, wherein shown first magneto-resistor and the 4th magneto-resistor are set to first position, the second magneto-resistor and third
Magneto-resistor is set to the second position；And in the longitudinal direction of copper bar type conducting wire longitudinal section shape to be measured, first position and
Two positions are not overlapped；First magneto-resistor, the second magneto-resistor, third magneto-resistor, the magnetic susceptibility direction of the 4th magneto-resistor are identical, and with
The extending direction of the short side of longitudinal section shape is parallel；The longitudinal section shape of copper bar type conducting wire to be measured is rectangle or fillet square
Shape；First magneto-resistor and the series connection of the second magneto-resistor, the both ends after series connection connect both ends of power, third magneto-resistor and the 4th magneto-resistor
Series connection, the both ends after series connection connect both ends of power, wherein the first magneto-resistor connects same power end with third magneto-resistor.
S303: obtaining the first voltage value between the first magneto-resistor and the second magneto-resistor, and obtains third magneto-resistor and the
Second voltage value between four magneto-resistors.
S304: the electric current of copper bar type conducting wire to be measured is obtained according to the difference of the first voltage value and second voltage value.
As shown in Fig. 3 A (or Fig. 3 B), A, B expression are respectively used to setting magnetic sensing unit the first magneto-resistor 51, the second magnetic
The first position and the second position of resistance 52, third magneto-resistor 53, the 4th magneto-resistor 54, first position, the second position it is specific
Definition refers to embodiment one.The difference of the embodiment and embodiment one is that the first magneto-resistor 51 and the 4th magneto-resistor 54 are set
It is placed in first position, the second magneto-resistor 52 and third magneto-resistor 53 are set to the second position；First magneto-resistor 51, the second magneto-resistor
52, third magneto-resistor 53, the magnetic susceptibility direction of the 4th magneto-resistor 54 are identical, and the extending direction with the short side of longitudinal section shape
In parallel；As shown in Figure 5 B, the first magneto-resistor 51 and the series connection of the second magneto-resistor 52, the both ends after series connection connect both ends of power, third
Magneto-resistor 53 and the series connection of the 4th magneto-resistor 54, the both ends after series connection connect both ends of power, wherein the first magneto-resistor 51 and third magnetic
Resistance 53 connects same power end.The first voltage value of the V- between the first magneto-resistor 51 and the second magneto-resistor 52 in Fig. 5 B, V
+ the second voltage value between third magneto-resistor 52 and the 4th magneto-resistor 54.Due on spatial arrangement, 51 He of the first magneto-resistor
4th magneto-resistor 54 is located at first position, and the second magneto-resistor 52 and third magneto-resistor 53 are located at the second position, in conjunction with Fig. 1 E it is found that
The line of magnetic induction of first position and the second position it is contrary, therefore by the first magneto-resistor 51, the second magneto-resistor 52 this
Result measured by branch (i.e. to the processing result of the first voltage V- in Fig. 5 C) with pass through third magneto-resistor 53, the 4th magnetoelectricity
Result (i.e. to the processing result of the second voltage V+ in Fig. 5 C) measured by 54 this branch is hindered on the contrary, its any one number
Value absolute value can be derived by (details are not described herein by the application) by mode described in embodiment two, then according to first
The obtained result of the difference of voltage value V- and the difference V+ of second voltage value processing is that technical solution described in embodiment two is defeated
2 times of result out.It can be seen that the present embodiment is compared with embodiment two, anti-interference is stronger.
The current measuring method of copper bar type conducting wire provided by the embodiment of the present invention, measured value is not vulnerable to power frequency
It influencing, the frequency scope of application is wider, there is preferable frequency characteristic, thus measurement result is more accurate.Specifically refer to implementation
Example one.
Optionally, where above-mentioned first position A and/or second position B is located at it in two short sides of longitudinal section shape
On the line of point, so that measurement result is more accurate.Specifically refer to the optional embodiment of embodiment one.
Example IV
The embodiment of the invention provides a kind of current measuring device of copper bar type conducting wire, the device need when in use to
It surveys in the middle part of copper bar type conducting wire and is provided with through-hole, can be used for executing embodiment one or its any one optional embodiment institute
The method stated.The device includes the first magnetic sensing unit, the second magnetic sensing unit and signal processing module.
First magnetic sensing unit, the second magnetic sensing unit are separately positioned on the first position of through-hole side wall, the second position, and
In the longitudinal direction of copper bar type conducting wire longitudinal section shape to be measured, first position and the second position are not overlapped；Copper bar type to be measured
The longitudinal section shape of conducting wire is rectangle or round rectangle；The magnetic susceptibility direction of magnetic sensing unit is short with longitudinal section shape
The extending direction on side is parallel.Specific C, Fig. 1 D and embodiment one referring to Figure 1.
Magnetic sensing unit in the application can be single magneto-resistor, be also possible to multiple magneto-resistors, or suddenly
That sensor or the unit that can sense magnetic induction intensity similar with Hall sensor.
Signal processing module is used to obtain the output of the first magnetic sensing unit and the second magnetic sensing unit, and according to the first magnetic
The electric current that the output valve of sensing unit and the second magnetic sensing unit obtains copper bar type conducting wire to be measured obtains copper bar type conducting wire to be measured
Electric current.
The signal processing module can be the module including processor chips, be also possible to operational amplifier and its periphery electricity
Road, or it is also possible to other electronic circuits, the application is without limitation.
The current measuring method of copper bar type conducting wire provided by the embodiment of the present invention, measured value is not vulnerable to power frequency
It influencing, the frequency scope of application is wider, there is preferable frequency characteristic, thus measurement result is more accurate.Specifically refer to implementation
Example one.
Embodiment five
The embodiment of the invention provides the current measuring device of another copper bar type conducting wire, which needs when in use
It is provided with through-hole in the middle part of copper bar type conducting wire to be measured, can be used for executing embodiment two or its any one optional embodiment
The method.The device includes the first magneto-resistor, the second magneto-resistor and signal processing module.
First magneto-resistor, the second magneto-resistor are separately positioned on the first position of through-hole side wall, the second position, and in copper to be measured
In the longitudinal direction of row's type conducting wire longitudinal section shape, first position and the second position are not overlapped；Copper bar type conducting wire to be measured is indulged
It is rectangle or round rectangle to cross sectional shape；The magnetic susceptibility direction of first magneto-resistor and the second magneto-resistor is and longitudinal section shape
Short side extending direction it is parallel, and the first magneto-resistor is identical with the magnetic susceptibility direction of the second magneto-resistor；First magneto-resistor and
The series connection of two magneto-resistors, the both ends after series connection are separately connected both ends of power.Specific C, Fig. 1 D and embodiment two referring to Figure 1.
Signal processing module, for obtaining the voltage value between the first magneto-resistor and the second magneto-resistor, and according to the first magnetic
Voltage value between resistance and the second magneto-resistor obtains the electric current of copper bar type conducting wire to be measured.
The signal processing module can be the module including processor chips, be also possible to operational amplifier and its periphery electricity
Road, or it is also possible to other electronic circuits, the application is without limitation.Optionally, signal processing module may include such as Fig. 4 C
Shown in operational amplifier, the Vo in Fig. 4 C is input terminal, and Vout is output end.
Embodiment six
The embodiment of the invention provides the current measuring device of another copper bar type conducting wire, which needs when in use
It is provided with through-hole in the middle part of copper bar type conducting wire to be measured, can be used for executing embodiment three or its any one optional embodiment
The method.The device includes the first magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor and signal processing mould
Block.
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor are separately positioned on first of through-hole side wall
It sets, the second position, wherein shown first magneto-resistor and the 4th magneto-resistor are set to first position, the second magneto-resistor and third magnetic
Resistance is set to the second position；And in the longitudinal direction of copper bar type conducting wire longitudinal section shape to be measured, first position and second
Position is not overlapped；First magneto-resistor, the second magneto-resistor, third magneto-resistor, the magnetic susceptibility direction of the 4th magneto-resistor are identical, and with it is vertical
Extending direction to the short side of cross sectional shape is parallel；The longitudinal section shape of copper bar type conducting wire to be measured is rectangle or round rectangle；
First magneto-resistor and the series connection of the second magneto-resistor, the both ends after series connection connect both ends of power, third magneto-resistor and the 4th magneto-resistor string
Connection, the both ends after series connection connect both ends of power, wherein the first magneto-resistor connects same power end with third magneto-resistor.
Signal processing module is used to obtain the first voltage value between the first magneto-resistor and the second magneto-resistor, and obtains third
Second voltage value between magneto-resistor and the 4th magneto-resistor, and it is to be measured according to the acquisition of the difference of the first voltage value and second voltage value
The electric current of copper bar type conducting wire.
As a kind of optional embodiment of example IV to six, first position and/or the second position are located at its place and indulge
To on the line at two short side midpoints of cross sectional shape.
Although being described in conjunction with the accompanying the embodiment of the present invention, those skilled in the art can not depart from the present invention
Spirit and scope in the case where various modifications and variations can be made, such modifications and variations are each fallen within by appended claims institute
Within the scope of restriction.
Claims (8)
1. a kind of current measuring method of copper bar type conducting wire characterized by comprising
At the middle part of copper bar type conducting wire to be measured, through-hole is set；
The first magnetic sensing unit, the second magnetic sensing unit is respectively set in first position, the second position of the through-hole side wall, and
In the longitudinal direction of the copper bar type conducting wire longitudinal section shape to be measured, the first position and the second position are not weighed
It closes；The longitudinal section shape of the copper bar type conducting wire to be measured is rectangle or round rectangle；The magnetic susceptibility side of the magnetic sensing unit
The extending direction of the short side of longitudinal section shape described in Xiang Junyu is parallel；
Obtain the output valve of the first magnetic sensing unit and the second magnetic sensing unit；
The copper bar type conducting wire to be measured is obtained according to the output valve of the first magnetic sensing unit and the second magnetic sensing unit
Electric current.
2. a kind of current measuring method of copper bar type conducting wire characterized by comprising
At the middle part of copper bar type conducting wire to be measured, through-hole is set；
Be respectively set the first magneto-resistor, the second magneto-resistor in first position, the second position of the through-hole side wall, and it is described to
It surveys in the longitudinal direction of copper bar type conducting wire longitudinal section shape, the first position and the second position are not overlapped；It is described to
The longitudinal section shape for surveying copper bar type conducting wire is rectangle or round rectangle；The magnetic of first magneto-resistor and second magneto-resistor
Sensitive direction is parallel with the extending direction of the short side of the longitudinal section shape, and first magneto-resistor and second magnetic
The magnetic susceptibility direction of resistance is identical；First magneto-resistor and second magneto-resistor series connection, the both ends after series connection are separately connected
Both ends of power；
Obtain the voltage value between first magneto-resistor and second magneto-resistor；
The electricity of the copper bar type conducting wire to be measured is obtained according to the voltage value between first magneto-resistor and second magneto-resistor
Stream.
3. a kind of current measuring method of copper bar type conducting wire characterized by comprising
At the middle part of copper bar type conducting wire to be measured, through-hole is set；
In the first position of the through-hole side wall, the second position, the first magneto-resistor, the second magneto-resistor, third magneto-resistor, the are set
Four magneto-resistors, wherein shown first magneto-resistor and the 4th magneto-resistor are set to the first position, second magneto-resistor and institute
It states third magneto-resistor and is set to the second position；And in the longitudinal direction of the copper bar type conducting wire longitudinal section shape to be measured
On, the first position and the second position are not overlapped；First magneto-resistor, second magneto-resistor, the third magnetic
Resistance, the magnetic susceptibility direction of the 4th magneto-resistor are identical and parallel with the extending direction of the short side of the longitudinal section shape；
The longitudinal section shape of the copper bar type conducting wire to be measured is rectangle or round rectangle；First magneto-resistor and second magnetoelectricity
Resistance series connection, the both ends after series connection connect both ends of power, and the third magneto-resistor and the 4th magneto-resistor are connected, and two after series connection
End connects the both ends of power, wherein first magneto-resistor connects same power end with the third magneto-resistor；
Obtain the first voltage value between first magneto-resistor and second magneto-resistor, and obtain the third magneto-resistor and
Second voltage value between 4th magneto-resistor；
The electric current of the copper bar type conducting wire to be measured is obtained according to the difference of the first voltage value and the second voltage value.
4. the measurement method of copper bar type conducting wire according to any one of claims 1 to 3, which is characterized in that described first
Set and/or the line at two short side midpoints that the second position is located at longitudinal section shape where it on.
5. a kind of current measuring device of copper bar type conducting wire, which is characterized in that be provided with through-hole in the middle part of copper bar type conducting wire to be measured；
Described device includes:
First magnetic sensing unit, the second magnetic sensing unit, are separately positioned on first position, the second position of the through-hole side wall,
And in the longitudinal direction of the copper bar type conducting wire longitudinal section shape to be measured, the first position and the second position are not weighed
It closes；The longitudinal section shape of the copper bar type conducting wire to be measured is rectangle or round rectangle；The magnetic susceptibility side of the magnetic sensing unit
The extending direction of the short side of longitudinal section shape described in Xiang Junyu is parallel；
Signal processing module, for obtaining the output of the first magnetic sensing unit and the second magnetic sensing unit, and according to
The electric current that the output valve of the first magnetic sensing unit and the second magnetic sensing unit obtains the copper bar type conducting wire to be measured obtains
Take the electric current of the copper bar type conducting wire to be measured.
6. a kind of current measuring device of copper bar type conducting wire, which is characterized in that be provided with through-hole in the middle part of copper bar type conducting wire to be measured；
Described device includes:
First magneto-resistor, the second magneto-resistor are separately positioned on first position, the second position of the through-hole side wall, and described
In the longitudinal direction of copper bar type conducting wire longitudinal section shape to be measured, the first position and the second position are not overlapped；It is described
The longitudinal section shape of copper bar type conducting wire to be measured is rectangle or round rectangle；First magneto-resistor and second magneto-resistor
Magnetic susceptibility direction is parallel with the extending direction of the short side of the longitudinal section shape, and first magneto-resistor and described second
The magnetic susceptibility direction of magneto-resistor is identical；First magneto-resistor and second magneto-resistor series connection, the both ends after series connection connect respectively
Connect both ends of power；
Signal processing module, for obtaining the voltage value between first magneto-resistor and second magneto-resistor, and according to institute
State the electric current that the voltage value between the first magneto-resistor and second magneto-resistor obtains the copper bar type conducting wire to be measured.
7. a kind of current measuring device of copper bar type conducting wire, which is characterized in that be provided with through-hole in the middle part of copper bar type conducting wire to be measured；
Described device includes:
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor, are separately positioned on the first of the through-hole side wall
Position, the second position, wherein shown first magneto-resistor and the 4th magneto-resistor are set to the first position, second magnetoelectricity
Resistance and the third magneto-resistor are set to the second position；And in the long side of the copper bar type conducting wire longitudinal section shape to be measured
On direction, the first position and the second position are not overlapped；First magneto-resistor, second magneto-resistor, described
Three magneto-resistors, the magnetic susceptibility direction of the 4th magneto-resistor are identical, and the extending direction with the short side of the longitudinal section shape
In parallel；The longitudinal section shape of the copper bar type conducting wire to be measured is rectangle or round rectangle；First magneto-resistor and described
The series connection of two magneto-resistors, the both ends after series connection connect both ends of power, the third magneto-resistor and the 4th magneto-resistor series connection, series connection
Both ends afterwards connect the both ends of power, wherein first magneto-resistor connects same power end with the third magneto-resistor；
Signal processing module for obtaining the first voltage value between first magneto-resistor and second magneto-resistor, and obtains
The second voltage value between the third magneto-resistor and the 4th magneto-resistor is taken, and according to the first voltage value and described
The difference of two voltage values obtains the electric current of the copper bar type conducting wire to be measured.
8. according to the measuring device of the described in any item copper bar type conducting wires of claim 5 to 7, which is characterized in that described first
Set and/or the line at two short side midpoints that the second position is located at longitudinal section shape where it on.
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