CN209446647U - The current measuring device of copper bar type conducting wire - Google Patents
The current measuring device of copper bar type conducting wire Download PDFInfo
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- CN209446647U CN209446647U CN201822007600.7U CN201822007600U CN209446647U CN 209446647 U CN209446647 U CN 209446647U CN 201822007600 U CN201822007600 U CN 201822007600U CN 209446647 U CN209446647 U CN 209446647U
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Abstract
The utility model discloses the current measuring devices of copper bar type conducting wire, one of device includes: at least one magnetic sensing unit, it is arranged close to the surface of copper bar type conducting wire to be measured, and the position of at least one magnetic sensing unit is the 1/5~1/7 of the long side length of the longitudinal section shape at a distance from the short side of the copper bar type conducting wire longitudinal section shape to be measured；The longitudinal section shape of the copper bar type conducting wire to be measured is rectangle or round rectangle；The magnetic susceptibility direction of the magnetic sensing unit is parallel with the extending direction of the long side；Signal processing module for obtaining the output valve of at least one magnetic sensing unit, and obtains according to the output valve of at least one magnetic sensing unit the electric current of the copper bar type conducting wire to be measured.The current measuring device of copper bar type conducting wire provided by the utility model embodiment, measured value are influenced smaller by power frequency, even if passing to the electric current of different frequency inside copper bar type conducting wire to be measured, also can relatively accurately export measurement result.
Description
Technical field
The utility model relates to current sensing techniques fields, and in particular to the current measuring 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 utility model embodiment provides the current measuring device of copper bar type conducting wire, to solve to work as copper bar
When passing to the electric current of different frequency inside type conducting wire, the problem of existing method can not accurately measure its electric current.
According in a first aspect, the utility model embodiment provides a kind of current measuring device of copper bar type conducting wire, comprising:
At least one magnetic sensing unit is arranged close to the surface of copper bar type conducting wire to be measured, and the position of at least one magnetic sensing unit
It sets at a distance from the short side of the copper bar type conducting wire longitudinal section shape to be measured as the long side length of the longitudinal section shape
1/5~1/7；The longitudinal section shape of the copper bar type conducting wire to be measured is rectangle or round rectangle；The magnetic of the magnetic sensing unit
Sensitive direction is parallel with the extending direction of the long side；Signal processing module, for obtaining at least one described magnetic sensing unit
Output valve, and obtain according to the output valve of at least one magnetic sensing unit the electric current of the copper bar type conducting wire to be measured.
According to second aspect, the utility model embodiment provides a kind of current measuring device of copper bar type conducting wire, comprising:
First magneto-resistor, the second magneto-resistor are arranged close to the surface of copper bar type conducting wire to be measured, and are separately positioned on the copper bar type to be measured
In two long sides of conducting wire longitudinal section shape；First magneto-resistor, second magneto-resistor and the longitudinal section shape
Short side distance be the longitudinal section shape long side length 1/5~1/7；First magneto-resistor and second magnetic
The magnetic susceptibility direction of resistance is parallel with the extending direction of the long side；First magneto-resistor and the second magneto-resistor string
Connection, the both ends after series connection are separately connected both ends of power；Signal processing module, for obtaining first magneto-resistor and described second
Voltage value between magneto-resistor, and according to the voltage value between first magneto-resistor and second magneto-resistor obtain it is described to
Survey the electric current of copper bar type conducting wire.
According to the third aspect, the utility model embodiment provides a kind of current measuring device of copper bar type conducting wire, comprising:
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor are arranged close to the surface of copper bar type conducting wire to be measured,
In, the one long of the copper bar type conducting wire longitudinal section shape to be measured is arranged in first magneto-resistor, the 4th magneto-resistor
Bian Shang, second magneto-resistor, the third magneto-resistor are arranged in another long side of the longitudinal section shape；Described
One magneto-resistor, second magneto-resistor, the third magneto-resistor, the 4th magneto-resistor are same with the longitudinal section shape
The distance of short side is the 1/5~1/7 of the long side length of the longitudinal section shape；First magneto-resistor, second magnetic
Resistance, the third magneto-resistor, the magnetic susceptibility direction of the 4th magneto-resistor are identical, and flat with the extending direction of the long side
Row；The longitudinal section shape of the copper bar type conducting wire to be measured is rectangle or round rectangle；First magneto-resistor and described 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, after series connection
Both ends connect the both ends of power；Signal processing module, for obtain first magneto-resistor and second magneto-resistor it
Between the first voltage value, and obtain the second voltage value between the third magneto-resistor and the 4th magneto-resistor, and according to institute
The difference for stating the first voltage value and the second voltage value obtains the electric current of the copper bar type conducting wire to be measured.
According to fourth aspect, the utility model embodiment provides a kind of current measuring device of copper bar type conducting wire, comprising:
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor are arranged close to the surface of copper bar type conducting wire to be measured, and position
In at least one long side of the copper bar type conducting wire longitudinal section shape to be measured, wherein each magneto-resistor and the longitudinal direction are cut
The distance of the short side of face shape is the 1/5~1/7 of the long side length of the longitudinal section shape；The copper bar type conducting wire to be measured
Longitudinal section shape is rectangle or round rectangle；First magneto-resistor and second magneto-resistor connect to form the first branch,
The both ends of the first branch connect both ends of power, and the third magneto-resistor and the 4th magneto-resistor connect to form second
The both ends on road, the second branch connect the both ends of power；The magnetic susceptibility direction of each magneto-resistor prolong with the long side
Stretch that direction is parallel, and in two in the first branch and the second branch magneto-resistor, one is located at one end of long side, magnetic
Sensitive direction is identical as the magnetic direction of position, and another one is located at the other end of long side, and magnetic susceptibility direction and institute are in place
The magnetic direction for setting place is opposite；Signal processing module, for obtaining between first magneto-resistor and second magneto-resistor
The first voltage value, and the second voltage value between the third magneto-resistor and the 4th magneto-resistor is obtained, and according to described
The difference of one voltage value and the second voltage value obtains the electric current of the copper bar type conducting wire to be measured.
According to the 5th aspect, the utility model embodiment provides a kind of current measuring device of copper bar type conducting wire, comprising:
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor are arranged close to the surface of copper bar type conducting wire to be measured, and position
In at least one long side of the copper bar type conducting wire longitudinal section shape to be measured, wherein each magneto-resistor and the longitudinal direction are cut
The distance of the short side of face shape is the 1/5~1/7 of the long side length of the longitudinal section shape；The copper bar type conducting wire to be measured
Longitudinal section shape is rectangle or round rectangle；First magneto-resistor and second magneto-resistor connect to form the first branch,
The both ends of the first branch connect both ends of power, and the third magneto-resistor and the 4th magneto-resistor connect to form second
The both ends on road, the second branch connect the both ends of power；Two magneto-resistors of the first branch are close to the longitudinal direction
One short side of cross sectional shape is arranged, and two magneto-resistors of the second branch are close to another of the longitudinal section shape
Short side setting；The magnetic susceptibility direction of each magneto-resistor is parallel with the extending direction of the long side, and two magnetic of each branch
In resistance, the magnetic susceptibility direction of one and the magnetic susceptibility direction of position are identical, the magnetic susceptibility direction of another one and place
Magnetic susceptibility at position is contrary；Signal processing module, for obtain first magneto-resistor and second magneto-resistor it
Between the first voltage value, and obtain the second voltage value between the third magneto-resistor and the 4th magneto-resistor；And according to institute
The difference for stating the first voltage value and the second voltage value obtains the electric current of the copper bar type conducting wire to be measured.
The current measuring device of copper bar type conducting wire provided by the utility model embodiment, measured value is by power frequency
Influence is smaller, even if passing to the electric current of different frequency inside copper bar type conducting wire to be measured, also can relatively accurately export measurement knot
Fruit.
Detailed description of the invention
Can be more clearly understood the feature and advantage of the utility model by reference to attached drawing, attached drawing be schematically without
It is interpreted as carrying out any restrictions to the utility model, 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. 2A shows the schematic diagram of magnetic sensing unit placement location in inventor's research process；
When Fig. 2 B shows magnetic sensing unit and is placed on different location, curve graph that measurement result changes with power frequency；
The position that Fig. 2 C shows magnetic sensing unit shows at a distance from the short side of copper bar type conducting wire longitudinal section shape to be measured
It is intended to；
Fig. 2 D is shown when the longitudinal section shape of copper bar type conducting wire to be measured is round rectangle, determines longitudinal section shape
Long side length and short side method schematic diagram；
Fig. 3 A shows a kind of flow chart of the current measuring method of copper bar type conducting wire according to the utility model embodiment；
Fig. 3 B to Fig. 3 F shows the placement schematic of the magnetic sensing unit according to the utility model embodiment；
Fig. 4 A shows the process of the current measuring method of another copper bar type conducting wire according to the utility model embodiment
Figure；
Fig. 4 B to Fig. 4 D shows the placement schematic of the magnetic sensing unit according to the utility model embodiment；
Fig. 4 E shows the electrical connection of two magneto-resistors shown in Fig. 4 B to Fig. 4 D；
Fig. 4 F shows a kind of electrical connection schematic diagram of operational amplifier suitable for Fig. 4 E；
Fig. 5 A shows the process of the current measuring method of another copper bar type conducting wire according to the utility model embodiment
Figure；
Fig. 5 B shows the placement schematic of the magnetic sensing unit according to the utility model embodiment；
Fig. 5 C shows the electrical connection of four magneto-resistors shown in Fig. 5 B；
Fig. 5 D shows a kind of electrical connection schematic diagram of operational amplifier suitable for Fig. 5 C；
Fig. 6 A shows the process of the current measuring method of another copper bar type conducting wire according to the utility model embodiment
Figure；
Fig. 6 B to Fig. 6 D shows the placement schematic of the magnetic sensing unit according to the utility model embodiment；
Fig. 6 E shows the electrical connection of four magneto-resistors shown in Fig. 6 B to Fig. 6 D；
Fig. 6 F shows a kind of electrical connection schematic diagram of operational amplifier suitable for Fig. 6 E；
Fig. 7 A shows the process of the current measuring method of another copper bar type conducting wire according to the utility model embodiment
Figure；
Fig. 7 B and Fig. 7 C show the placement schematic of the magnetic sensing unit according to the utility model embodiment；
Fig. 7 D shows the electrical connection schematic diagram of four magneto-resistors shown in Fig. 7 B and Fig. 7 C；
Fig. 7 E shows a kind of electrical connection schematic diagram of operational amplifier suitable for Fig. 7 D.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, those skilled in the art's every other embodiment obtained without creative efforts, belongs to this reality
With novel protected range.
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 being led close to the surface of copper bar type conducting wire to be measured, and along copper bar type to be measured
In the longitudinal direction of line longitudinal section shape, magnetic sensing unit is moved from the medium position of long side to the marginal position of long side
(as shown in Figure 2 A, from the position 1 at middle line QQ ' successively move outward to position 2,3,4,5), then when in copper bar type conducting wire to be measured
When the power frequency of portion's circulation is within 100Hz, not by the difference of current value measured by the magnetic sensing unit at different location
Greatly；However, being sensed when the power frequency of copper bar type conducting wire internal circulation to be measured is greater than 100Hz by the magnetic at different location
The difference of current value measured by unit is larger.
Based on the discovery, inventor courageously guesses: when the power frequency of copper bar type conducting wire internal circulation to be measured is greater than 100Hz
In the range of when changing, magnetic sensing unit is placed on the current value curve measured at different location and differs greatly.In this regard, invention
People has carried out experimental verification, method particularly includes: when magnetic sensing unit being made to be placed on a certain fixed position, it is sequentially increased copper bar to be measured
The frequency of institute's circulating current in type conducting wire, while recording measurement result；Then the position of magnetic sensing unit is moved, then is executed same
Operation ... finally, measured value when passing to 1Hz electric current using copper bar type conducting wire to be measured as a reference value, by all measurement results
Measurement result after being normalized divided by a reference value.Experiment results are as shown in Figure 2 B, wherein 1,2,3,4,5 point of curve
It is not corresponding with the placement location 1,2,3,4,5 of magnetic sensing unit in Fig. 2A.As can be seen that the guess of inventor obtains from Fig. 2 B
Preferable verifying.
Common knowledge based on this field is usually not intended to measurement result to increase with frequency when current sensor is arranged
And have decaying, but can receive measurement result has leaping high within a certain range with frequency increase.It, can based on the common knowledge
To find out that the curve 4 in Fig. 2 B more meets the design requirement of current sensor.
In this regard, inventor is studied for 4 accurate location of position corresponding to curve 4.The study found that when magnetic senses
(distance d) as shown in FIG. 2 C is longitudinal at a distance from the short side of copper bar type conducting wire longitudinal section shape to be measured for the position of unit
The long side length of cross sectional shape 1/5~1/7 when, the curve that can obtain meeting current sensor design requirement (meets electricity
The curve of flow sensor design requirement, it may be assumed that measurement result increases with frequency without decaying, and measurement result can have with frequency increase
Leaping high within a certain range), and as frequency increases measurement result variation less, that is, there is good frequency characteristic.
Based on the studies above as a result, inventors herein proposing the current measuring method and dress of copper bar type conducting wire described herein
It sets, application scheme is described in detail below.
It needs to illustrate in advance, it, can basis when the longitudinal section shape of copper bar type conducting wire to be measured is round rectangle
Method shown in Fig. 2 D determines the long side length a and short side B (i.e. thick dashed line in Fig. 2 D) of longitudinal section shape.
In addition, it is necessary to illustrate in advance, the magnetic susceptibility direction in the application is direction vector, both includes " working as the direction
Magnetic field when increasing, the direction (also referred to as positive magnetic susceptibility direction) that the positive output value of magneto sensor increases ", also include " working as the direction
Magnetic field when increasing, the direction (also referred to as negative magnetic susceptibility direction) that the positive output value of magneto sensor reduces ".
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. 3 A shows a kind of flow chart of the current measuring method of copper bar type conducting wire according to the utility model embodiment.
As shown in Figure 3A, this method comprises the following steps:
S101: at least one magnetic sensing unit is set close to the surface of copper bar type conducting wire to be measured, and at least one magnetic senses
The position of unit is the long side length of longitudinal section shape at a distance from the short side of copper bar type conducting wire longitudinal section shape to be measured
1/5~1/7；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
It is parallel with the extending direction of long side.
Can be as shown in Figure 3B, a magnetic sensing unit X is set；Can also be as shown in Figure 3 C, in longitudinal section shape one
Magnetic sensing unit X, Y is respectively set in the two sides of a long side；It can also be as shown in Fig. 3 D and Fig. 3 E, at two of longitudinal section shape
Magnetic sensing unit X, Y are respectively set in long side；It can also distinguish as illustrated in Figure 3 F in a long side two sides of longitudinal section shape
Magnetic sensing unit X1, X2 are set, magnetic sensing unit Y1, Y2 is respectively set in another long side two sides.In above-mentioned set-up mode,
The position of any magnetic sensing unit at a distance from the short side of longitudinal section shape for the long side length of longitudinal section shape 1/5~
1/7, the magnetic susceptibility direction of magnetic sensing unit is parallel with the extending direction of long side (as shown in arrow of Fig. 3 B into 3F in X or Y).
Above range 1/5~1/7 specifically includes numerical value 1/5,1/6,1/7.
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.
S102: the output valve of at least one magnetic sensing unit is obtained.
S103: the electric current of copper bar type conducting wire to be measured is obtained according to the output valve of at least one magnetic sensing unit.
Step S103 can be to be amplified and/or linear compensation is measured according to the output valve of a magnetic sensing unit
As a result, be also possible to the output valve of two magnetic sensing units seeking difference, then amplify and/or linear compensation obtains measurement knot
Fruit, can also be cooked other operations by the output valve of more than two magnetic sensing units or processing obtains measurement result, the application couple
In the output valve by magnetic sensing unit to measurement result specific processing step without limitation.
According to the inventor's study as a result, the setting position of magnetic sensing unit can obtain meeting electric current biography in step S101
The curve of sensor design requirement, and make: as frequency increases measurement result variation less, that is, there is good frequency characteristic.
Therefore, the current measuring method of above-mentioned copper bar type conducting wire is influenced smaller by power frequency, even if inside copper bar type conducting wire to be measured
The electric current of different frequency is passed to, measurement result also can be relatively accurately exported.
Embodiment two
Fig. 4 A shows the process of the current measuring method of another copper bar type conducting wire according to the utility model embodiment
Figure.As shown in Figure 4 A, this method comprises the following steps:
S201: close to copper bar type conducting wire to be measured surface and in the long side of copper bar type conducting wire longitudinal section shape to be measured
First magneto-resistor, the second magneto-resistor are set, and the first magneto-resistor, the second magneto-resistor are vertical at a distance from the short side of longitudinal section shape
To the 1/5~1/7 of the long side length of cross sectional shape；The magnetic susceptibility direction of first magneto-resistor and the second magneto-resistor prolong with long side
It is parallel to stretch direction；First magneto-resistor and the series connection of the second magneto-resistor, the both ends after series connection are separately connected both ends of power.
As shown in Figure 4 B, can be respectively set in the two sides of a long side of copper bar type conducting wire longitudinal section shape to be measured
One magneto-resistor R1, the second magneto-resistor R2, the magnetic susceptibility that the first magneto-resistor R1 and the second magneto-resistor R2 are arranged at this time are contrary.?
The first magneto-resistor R1, the second magneto-resistor can be respectively set in two long sides of copper bar type conducting wire longitudinal section shape to be measured
R2, the two magneto-resistors can be located at the same side (as shown in Figure 4 C) of long side, can also be located at not ipsilateral (such as Fig. 4 D of long side
It is shown), the magnetic susceptibility direction that the first magneto-resistor R1 and the second magneto-resistor R2 are arranged at this time is identical.Fig. 4 E shows the first magneto-resistor
The electrical connection of R1 and the second magneto-resistor R2.
Above range 1/5~1/7 specifically includes numerical value 1/5,1/6,1/7.
S202: the voltage value between the first magneto-resistor and the second magneto-resistor is obtained.Obtain voltage as shown in figure 4e
Vo。
S203: 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.
The current measuring method of above-mentioned copper bar type conducting wire influenced by power frequency it is smaller, even if in copper bar type conducting wire to be measured
Portion passes to the electric current of different frequency, also can relatively accurately export measurement result.Specifically refer to embodiment one.
Above-mentioned steps S202 and S203 can be executed using operational amplifier and its peripheral circuit, as illustrated in figure 4f,
Middle Vo is voltage when copper bar type conducting wire to be measured is powered between the first magneto-resistor R1 and the second magneto-resistor R2.Above-mentioned steps S202 and
S203 can also be executed using the module for including processor chips, or be also possible to other electronic circuits executing, this Shen
Please without limitation.
Embodiment three
Fig. 5 A shows the process of the current measuring method of another copper bar type conducting wire according to the utility model embodiment
Figure.As shown in Figure 5A, this method comprises the following steps:
S301: first magneto-resistor, the second magneto-resistor, third magneto-resistor, the are set close to the surface of copper bar type conducting wire to be measured
Four magneto-resistors a, wherein long side of copper bar type conducting wire longitudinal section shape to be measured is arranged in the first magneto-resistor, the 4th magneto-resistor
On, the second magneto-resistor, third magneto-resistor are arranged in another long side of longitudinal section shape；First magneto-resistor, the second magnetoelectricity
Resistance, third magneto-resistor, the 4th magneto-resistor are the long side of longitudinal section shape at a distance from the same short side of longitudinal section shape
The 1/5~1/7 of length；First magneto-resistor, the second magneto-resistor, third magneto-resistor, the magnetic susceptibility direction of the 4th magneto-resistor are identical, and
It is parallel with the extending direction of long side；The longitudinal section shape of copper bar type conducting wire to be measured is rectangle or round rectangle；First magneto-resistor
It connects to form the first branch with the second magneto-resistor, the both ends of the first branch connect both ends of power, third magneto-resistor and the 4th magnetoelectricity
Resistance series connection forms second branch, and the both ends of second branch connect both ends of power, wherein connects together in the first branch and second branch
The magnetic susceptibility direction of two magneto-resistors of one power end is identical.
As shown in Figure 5 B, the first magneto-resistor R1, the 4th magneto-resistor R4 are located in the top long side of longitudinal section shape, and second
Magneto-resistor R2, third magneto-resistor R3 are located in the lower section long side of longitudinal section shape；This four magneto-resistors are apart from longitudinal cross-section shape
The distance of the right short of shape is the 1/5~1/7 of the long side long side length of longitudinal section shape；And the magnetic of this four magneto-resistors
Sensitive direction is all parallel with the extending direction of long side, and direction is identical.Fig. 5 C shows the electrical connection of four magneto-resistors.
Above range 1/5~1/7 specifically includes numerical value 1/5,1/6,1/7.
S302: 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.Obtain the first voltage value V- as shown in Figure 5 C, second voltage value V+.
S303: 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.
The current measuring method of above-mentioned copper bar type conducting wire influenced by power frequency it is smaller, even if in copper bar type conducting wire to be measured
Portion passes to the electric current of different frequency, also can relatively accurately export measurement result.Specifically refer to embodiment one.
Above-mentioned steps S302 and S303 can be executed using operational amplifier and its peripheral circuit, as shown in Figure 5 D,
In, first voltage of the V- between the first magneto-resistor R1 and the second magneto-resistor R2, V+ is third magneto-resistor R3 and the 4th magneto-resistor
Second voltage between R4.Above-mentioned steps S302 and S303 can also be executed using including the module of processor chips, or
It is also possible to other electronic circuits to execute, the application is without limitation.
Example IV
Fig. 6 A shows the process of the current measuring method of another copper bar type conducting wire according to the utility model embodiment
Figure.As shown in Figure 6A, this method comprises the following steps:
S401: close to copper bar type conducting wire to be measured surface and at least the one of copper bar type conducting wire longitudinal section shape to be measured
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor are set in a long side, wherein each magneto-resistor and longitudinal direction
The distance of the short side of cross sectional shape is the 1/5~1/7 of the long side length of longitudinal section shape；The longitudinal direction of copper bar type conducting wire to be measured is cut
Face shape is rectangle or round rectangle；First magneto-resistor and the second magneto-resistor connect to form the first branch, the both ends of the first branch
Both ends of power is connected, third magneto-resistor and the 4th magneto-resistor connect to form second branch, and the both ends of second branch connect power supply two
End；The magnetic susceptibility direction of each magneto-resistor is parallel with the extending direction of long side, and two in the first branch and second branch
In magneto-resistor, one is located at one end of long side, and magnetic susceptibility direction is identical as the magnetic direction of position, and another one is located at length
The other end on side, magnetic susceptibility direction are opposite with the magnetic direction of position.
For example, as shown in Figure 6B, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 can be set
In the same long side, each magneto-resistor at a distance from the short side of longitudinal cross-section for longitudinal section shape long side length 1/5~
1/7.Fig. 6 E shows the electrical connection of four magneto-resistors.The first magnetic in two branches shown in Fig. 6 E, in the first branch
Resistance R1 is contrary with the magnetic susceptibility of the second magneto-resistor R2 (because of the first magneto-resistor R1 and the second magneto-resistor R2 position
Magnetic direction it is identical), and the two is located at the both ends of institute's long side；Third magneto-resistor R3 and the 4th magnetoelectricity in second branch
The magnetic susceptibility for hindering R4 is contrary (because third magneto-resistor R3 and the magnetic direction of the 4th magneto-resistor R4 position are identical),
And the two is located at the both ends of long side.
As shown in Figure 6 C, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 also can be set two
In a long side.Wherein, a long side of longitudinal section shape is arranged in (as top is long in the first magneto-resistor R1, the second magneto-resistor R2
Side) on, third magneto-resistor R3, the 4th magneto-resistor R4 are arranged in another long side (such as lower section long side) of longitudinal section shape.
Fig. 6 E shows the electrical connection of four magneto-resistors.It is each shown in Fig. 6 E when disposing magneto-resistor according to position shown in Fig. 6 C
In two magneto-resistors of branch, one is located at one end of long side, and the other end that another one is located at long side (both is i.e. located at length
The both ends on side).
As shown in Figure 6 D, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 also can be set two
In a long side.Wherein, a long side of longitudinal section shape is arranged in (as top is long in the first magneto-resistor R1, the 4th magneto-resistor R4
Side) on, the second magneto-resistor R2, third magneto-resistor R3 are arranged in another long side (such as lower section long side) of longitudinal section shape.
Fig. 6 E shows the electrical connection of four magneto-resistors.It is each shown in Fig. 6 E when disposing magneto-resistor according to position shown in Fig. 6 D
In two magneto-resistors of branch, one is located at one end of long side, and the other end that another one is located at long side (both is i.e. located at length
The both ends on side).
When two branches shown in Fig. 6 E are disposed according to position shown in Fig. 6 C, the first magneto-resistor R1 in the first branch with
Contrary (the magnetic direction phase of the first magneto-resistor R1 and the second magneto-resistor R2 position of the magnetic susceptibility of second magneto-resistor R2
Together), third magneto-resistor R3 in second branch it is contrary with the magnetic susceptibility of the 4th magneto-resistor R4 (because third magneto-resistor R3 and
The magnetic direction of 4th magneto-resistor R4 position is identical).Two branches shown in Fig. 6 E are according to position portion shown in Fig. 6 D
The first magneto-resistor R1 (first magneto-resistor R1 and identical as the magnetic susceptibility direction of the second magneto-resistor R2 when administration, in the first branch
The magnetic direction of two magneto-resistor R2 positions is opposite), third magneto-resistor R3's and the 4th magneto-resistor R4 in second branch
Magnetic susceptibility direction is identical (because third magneto-resistor R3 and the magnetic direction of the 4th magneto-resistor R4 position are opposite).
Above range 1/5~1/7 specifically includes numerical value 1/5,1/6,1/7.
402: obtaining the first voltage value between the first magneto-resistor and the second magneto-resistor, and obtain third magneto-resistor and the 4th
Second voltage value between magneto-resistor.Obtain the first voltage value V-, second voltage value V+ as is shown in figure 6e.
S403: 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.
The current measuring method of above-mentioned copper bar type conducting wire influenced by power frequency it is smaller, even if in copper bar type conducting wire to be measured
Portion passes to the electric current of different frequency, also can relatively accurately export measurement result.Specifically refer to embodiment one.
Above-mentioned steps S402 and S403 can be executed using operational amplifier and its peripheral circuit, as fig 6 f illustrates,
In, first voltage of the V- between the first magneto-resistor R1 and the second magneto-resistor R2, V+ is third magneto-resistor R3 and the 4th magneto-resistor
Second voltage between R4.Above-mentioned steps S402 and S403 can also be executed using including the module of processor chips, or
It is also possible to other electronic circuits to execute, the application is without limitation.
Embodiment five
Fig. 7 A shows the process of the current measuring method of another copper bar type conducting wire according to the utility model embodiment
Figure.As shown in Figure 7 A, this method comprises the following steps:
S501: close to copper bar type conducting wire to be measured surface and at least the one of copper bar type conducting wire longitudinal section shape to be measured
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor are set in a long side, wherein each magneto-resistor and longitudinal direction
The distance of the short side of cross sectional shape is the 1/5~1/7 of the long side length of longitudinal section shape；The longitudinal direction of copper bar type conducting wire to be measured is cut
Face shape is rectangle or round rectangle；First magneto-resistor and the second magneto-resistor connect to form the first branch, the both ends of the first branch
Both ends of power is connected, third magneto-resistor and the 4th magneto-resistor connect to form second branch, and the both ends of second branch connect power supply two
End；Two magneto-resistors of the first branch are close to the short side setting of longitudinal section shape, two magneto-resistors of second branch
It is close to another short side setting of longitudinal section shape；The magnetic susceptibility direction of each magneto-resistor is flat with the extending direction of long side
Row, and in two magneto-resistors of each branch, the magnetic susceptibility direction of one and the magnetic susceptibility direction of position are identical, another
The magnetic susceptibility direction of person is contrary with the magnetic susceptibility of position.
Referring in two branches shown in Fig. 7 B and Fig. 7 C, Fig. 7 D, the first magneto-resistor R1 of the first branch and the second magnetoelectricity
Resistance R2 is close to the left side short side setting of longitudinal section shape, and the third magneto-resistor R3 and the 4th magneto-resistor R4 of second branch are leaned on
The right short setting of nearly longitudinal section shape；The magnetic susceptibility direction of two magneto-resistors of each branch is identical (because of each
The magnetic direction of two magneto-resistor positions on road is opposite).
Above range 1/5~1/7 specifically includes numerical value 1/5,1/6,1/7.
S502: 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.
S503: 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.
The current measuring method of above-mentioned copper bar type conducting wire influenced by power frequency it is smaller, even if in copper bar type conducting wire to be measured
Portion passes to the electric current of different frequency, also can relatively accurately export measurement result.Specifically refer to embodiment one.
Above-mentioned steps S502 and S503 can be executed using operational amplifier and its peripheral circuit, as seen in figure 7e,
In, first voltage of the V- between the first magneto-resistor R1 and the second magneto-resistor R2, V+ is third magneto-resistor R3 and the 4th magneto-resistor
Second voltage between R4.Above-mentioned steps S502 and S503 can also be executed using including the module of processor chips, or
It is also possible to other electronic circuits to execute, the application is without limitation.
Embodiment six
The utility model embodiment provides a kind of current measuring device of copper bar type conducting wire, can be used for executing embodiment
One or its any one optional embodiment described in method.The device includes at least one magnetic sensing unit and signal processing
Module.
At least one magnetic sensing unit is arranged close to the surface of copper bar type conducting wire to be measured, and at least one magnetic sensing unit
Position at a distance from the short side of copper bar type conducting wire longitudinal section shape to be measured for longitudinal section shape long side length 1/5~
1/7；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 and long side
Extending direction it is parallel.
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 sensed for obtaining the output valve of at least one magnetic sensing unit, and according at least one magnetic
The output valve of unit 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.
The current measuring device of above-mentioned copper bar type conducting wire influenced by power frequency it is smaller, even if in copper bar type conducting wire to be measured
Portion passes to the electric current of different frequency, also can relatively accurately export measurement result.Specifically refer to embodiment one.
Optionally, the positional relationship between magnetic sensing unit and copper bar type conducting wire to be measured, signal are arranged by fixed device
Processing module can be arranged independently of the fixation device, also can be set on the fixation device.When signal processing module is arranged
When on the securing means, it is provided with pcb board on fixed device, magnetic sensing unit and signal processing module are set on pcb board,
When measurement, it is only necessary to which the magnetic sensor unit on PCB is placed on predetermined position.
Embodiment seven
The utility model embodiment provides the current measuring device of another copper bar type conducting wire, can be used for executing implementation
Method described in example two or its any one optional embodiment.The device includes the first magneto-resistor, the second magneto-resistor and letter
Number processing module.
First magneto-resistor, the second magneto-resistor are arranged close to the surface of copper bar type conducting wire to be measured, and are separately positioned on copper to be measured
In two long sides of row's type conducting wire longitudinal section shape；The short side of first magneto-resistor, the second magneto-resistor and longitudinal section shape
Distance is the 1/5~1/7 of the long side length of longitudinal section shape；The magnetic susceptibility direction of first magneto-resistor and the second magneto-resistor with
The extending direction of long side is parallel；First magneto-resistor and the series connection of the second magneto-resistor, 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 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 F
Shown in operational amplifier, the Vo in Fig. 4 F is input terminal, and Vout is output end.
The current measuring device of above-mentioned copper bar type conducting wire influenced by power frequency it is smaller, even if in copper bar type conducting wire to be measured
Portion passes to the electric current of different frequency, also can relatively accurately export measurement result.Specifically refer to embodiment two.
Optionally, the positional relationship between magneto-resistor and copper bar type conducting wire to be measured, signal processing are arranged by fixed device
Module can be arranged independently of the fixation device, also can be set on the fixation device.When signal processing module setting is solid
When determining on device, it is provided with pcb board on fixed device, magneto-resistor and signal processing module be set on pcb board, when measurement,
It only needs the magnetic sensor unit on PCB being placed on predetermined position.
Embodiment eight
The utility model embodiment provides the current measuring device of another copper bar type conducting wire, can be used for executing implementation
Method described in example three or its any one optional embodiment.The device includes the first magneto-resistor, the second magneto-resistor, third
Magneto-resistor, the 4th magneto-resistor and signal processing module.
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor, close to the surface of copper bar type conducting wire to be measured
Setting, wherein the first magneto-resistor, the 4th magneto-resistor are arranged in a long side of copper bar type conducting wire longitudinal section shape to be measured,
Second magneto-resistor, third magneto-resistor are arranged in another long side of longitudinal section shape；First magneto-resistor, the second magneto-resistor,
Third magneto-resistor, the 4th magneto-resistor are the long side length of longitudinal section shape at a distance from the same short side of longitudinal section shape
1/5~1/7；First magneto-resistor, the second magneto-resistor, third magneto-resistor, the magnetic susceptibility direction of the 4th magneto-resistor are identical, and with length
The extending direction on side 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 two magneto-resistors, the both ends after series connection connect both ends of power, third magneto-resistor and the series connection of the 4th magneto-resistor, the both ends after series connection
Connect both ends of power；
Signal processing module for obtaining the first voltage value between the first magneto-resistor and the second magneto-resistor, and obtains the
Second voltage value between three magneto-resistors and the 4th magneto-resistor, and according to the difference of the first voltage value and second voltage value obtain to
Survey the electric current of copper bar type conducting wire.
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 can be such as Fig. 5 D institute
The operational amplifier shown, the V+ in Fig. 5 D are first input end, and V- is the second input terminal, and Vout is output end.
The current measuring device of above-mentioned copper bar type conducting wire influenced by power frequency it is smaller, even if in copper bar type conducting wire to be measured
Portion passes to the electric current of different frequency, also can relatively accurately export measurement result.Specifically refer to embodiment three.
Optionally, the positional relationship between magneto-resistor and copper bar type conducting wire to be measured, signal processing are arranged by fixed device
Module can be arranged independently of the fixation device, also can be set on the fixation device.When signal processing module setting is solid
When determining on device, it is provided with pcb board on fixed device, magneto-resistor and signal processing module be set on pcb board, when measurement,
It only needs the magnetic sensor unit on PCB being placed on predetermined position.
Embodiment nine
The utility model embodiment provides the current measuring device of another copper bar type conducting wire, can be used for executing implementation
Method described in example four or its any one optional embodiment.The device includes the first magneto-resistor, the second magneto-resistor, third
Magneto-resistor, the 4th magneto-resistor and signal processing module.
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor, close to the surface of copper bar type conducting wire to be measured
Setting, and be located at least one long side of copper bar type conducting wire longitudinal section shape to be measured, wherein each magneto-resistor and longitudinal section
The distance of the short side of face shape is the 1/5~1/7 of the long side length of longitudinal section shape；The longitudinal cross-section of copper bar type conducting wire to be measured
Shape is rectangle or round rectangle；First magneto-resistor and the second magneto-resistor connect to form the first branch, and the both ends of the first branch connect
Connect both ends of power；Third magneto-resistor and the 4th magneto-resistor connect to form second branch, and the both ends of second branch connect both ends of power；
The magnetic susceptibility direction of each magneto-resistor is parallel with the extending direction of long side, and two magnetoelectricities in the first branch and second branch
In resistance, one is located at one end of long side, and magnetic susceptibility direction is identical as the magnetic direction of position, and another one is located at long side
The other end, magnetic susceptibility direction are opposite with the magnetic direction of position.
Signal processing module for obtaining the first voltage value between the first magneto-resistor and the second magneto-resistor, and obtains the
Second voltage value between three magneto-resistors and the 4th magneto-resistor, and according to the difference of the first voltage value and second voltage value obtain to
Survey the electric current of copper bar type conducting wire.
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 can be such as Fig. 6 F institute
The operational amplifier shown, the V+ in Fig. 6 F are first input end, and V- is the second input terminal, and Vout is output end.
The current measuring device of above-mentioned copper bar type conducting wire influenced by power frequency it is smaller, even if in copper bar type conducting wire to be measured
Portion passes to the electric current of different frequency, also can relatively accurately export measurement result.Specifically refer to example IV.
Optionally, the positional relationship between magneto-resistor and copper bar type conducting wire to be measured, signal processing are arranged by fixed device
Module can be arranged independently of the fixation device, also can be set on the fixation device.When signal processing module setting is solid
When determining on device, it is provided with pcb board on fixed device, magneto-resistor and signal processing module be set on pcb board, when measurement,
It only needs the magnetic sensor unit on PCB being placed on predetermined position.
Embodiment ten
The utility model embodiment provides the current measuring device of another copper bar type conducting wire, can be used for executing implementation
Method described in example five or its any one optional embodiment.The device includes the first magneto-resistor, the second magneto-resistor, third
Magneto-resistor, the 4th magneto-resistor and signal processing module.
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor, close to the surface of copper bar type conducting wire to be measured
Setting, and be located at least one long side of the copper bar type conducting wire longitudinal section shape to be measured, wherein each magneto-resistor and institute
State the short side of longitudinal section shape distance be the longitudinal section shape long side length 1/5~1/7；The copper bar to be measured
The longitudinal section shape of type conducting wire is rectangle or round rectangle；First magneto-resistor and second magneto-resistor connect to form
The both ends of one branch, the first branch connect both ends of power, and the third magneto-resistor and the 4th magneto-resistor connect to be formed
The both ends of second branch, the second branch connect the both ends of power；Two magneto-resistors of the first branch are close to institute
The short side setting of longitudinal section shape is stated, two magneto-resistors of the second branch are close to the longitudinal section shape
The setting of another short side；The magnetic susceptibility direction of each magneto-resistor is parallel with the extending direction of the long side, and each branch
In two magneto-resistors, the magnetic susceptibility direction of one and the magnetic susceptibility direction of position are identical, the magnetic susceptibility direction of another one
It is contrary with the magnetic susceptibility of position.
Signal processing module, for obtaining the first voltage value between first magneto-resistor and second magneto-resistor,
And obtain the second voltage value between the third magneto-resistor and the 4th magneto-resistor；And according to the first voltage value and institute
The difference for stating second voltage value obtains the electric current of the 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 can be such as Fig. 7 E institute
The operational amplifier shown, the V+ in Fig. 7 E are first input end, and V- is the second input terminal, and Vout is output end.
The current measuring device of above-mentioned copper bar type conducting wire influenced by power frequency it is smaller, even if in copper bar type conducting wire to be measured
Portion passes to the electric current of different frequency, also can relatively accurately export measurement result.Specifically refer to embodiment five.
Although being described in conjunction with the accompanying the embodiments of the present invention, those skilled in the art can not depart from this
Various modifications and variations can be made in the case where the spirit and scope of utility model, and such modifications and variations are each fallen within by appended power
Benefit requires within limited range.
Claims (5)
1. a kind of current measuring device of copper bar type conducting wire characterized by comprising
At least one magnetic sensing unit is arranged close to the surface of copper bar type conducting wire to be measured, and at least one described magnetic sensing unit
Position at a distance from the short side of the copper bar type conducting wire longitudinal section shape to be measured be the longitudinal section shape long side length
The 1/5~1/7 of degree；The longitudinal section shape of the copper bar type conducting wire to be measured is rectangle or round rectangle；The magnetic sensing unit
Magnetic susceptibility direction it is parallel with the extending direction of the long side；
Signal processing module, for obtaining the output valve of at least one magnetic sensing unit, and according at least one described magnetic
The output valve of sensing unit obtains the electric current of the copper bar type conducting wire to be measured.
2. a kind of current measuring device of copper bar type conducting wire characterized by comprising
First magneto-resistor, the second magneto-resistor are arranged close to the surface of copper bar type conducting wire to be measured, and are separately positioned on the copper to be measured
In two long sides of row's type conducting wire longitudinal section shape；First magneto-resistor, second magneto-resistor and the longitudinal cross-section
The distance of the short side of shape is the 1/5~1/7 of the long side length of the longitudinal section shape；First magneto-resistor and described
The magnetic susceptibility direction of two magneto-resistors is parallel with the extending direction of the long side；First magneto-resistor 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 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.
3. a kind of current measuring device of copper bar type conducting wire characterized by comprising
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor are arranged close to the surface of copper bar type conducting wire to be measured,
Wherein, one of the copper bar type conducting wire longitudinal section shape to be measured is arranged in first magneto-resistor, the 4th magneto-resistor
In long side, second magneto-resistor, the third magneto-resistor are arranged in another long side of the longitudinal section shape；It is described
First magneto-resistor, second magneto-resistor, the third magneto-resistor, the 4th magneto-resistor are same with the longitudinal section shape
The distance of one short side is the 1/5~1/7 of the long side length of the longitudinal section shape；First magneto-resistor, described second
Magneto-resistor, the third magneto-resistor, the magnetic susceptibility direction of the 4th magneto-resistor are identical, and flat with the extending direction of the long side
Row；The longitudinal section shape of the copper bar type conducting wire to be measured is rectangle or round rectangle；First magneto-resistor and described 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, after series connection
Both ends connect the both ends of power；
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.
4. a kind of current measuring device of copper bar type conducting wire characterized by comprising
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor are arranged close to the surface of copper bar type conducting wire to be measured,
And it is located at least one long side of the copper bar type conducting wire longitudinal section shape to be measured, wherein each magneto-resistor is indulged with described
Distance to the short side of cross sectional shape is the 1/5~1/7 of the long side length of the longitudinal section shape；The copper bar type to be measured is led
The longitudinal section shape of line is rectangle or round rectangle；First magneto-resistor and second magneto-resistor connect to form first
The both ends on road, the first branch connect both ends of power, and the third magneto-resistor and the 4th magneto-resistor connect to form second
The both ends of branch, the second branch connect the both ends of power；The magnetic susceptibility direction of each magneto-resistor with the long side
Extending direction is parallel, and in two in the first branch and the second branch magneto-resistor, one is located at one end of long side,
Magnetic susceptibility direction is identical as the magnetic direction of position, and another one is located at the other end of long side, magnetic susceptibility direction and place
Magnetic direction at position is opposite；
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.
5. a kind of current measuring device of copper bar type conducting wire characterized by comprising
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor are arranged close to the surface of copper bar type conducting wire to be measured,
And it is located at least one long side of the copper bar type conducting wire longitudinal section shape to be measured, wherein each magneto-resistor is indulged with described
Distance to the short side of cross sectional shape is the 1/5~1/7 of the long side length of the longitudinal section shape；The copper bar type to be measured is led
The longitudinal section shape of line is rectangle or round rectangle；First magneto-resistor and second magneto-resistor connect to form first
The both ends on road, the first branch connect both ends of power, and the third magneto-resistor and the 4th magneto-resistor connect to form second
The both ends of branch, the second branch connect the both ends of power；Two magneto-resistors of the first branch are close to described vertical
It is arranged to a short side of cross sectional shape, two magneto-resistors of the second branch are close to the another of the longitudinal section shape
A short side setting；The magnetic susceptibility direction of each magneto-resistor is parallel with the extending direction of the long side, and two of each branch
In magneto-resistor, the magnetic susceptibility direction of one and the magnetic susceptibility direction of position are identical, the magnetic susceptibility direction of another one and institute
Magnetic susceptibility at position is contrary；
Signal processing module for obtaining the first voltage value between first magneto-resistor and second magneto-resistor, and obtains
Take the second voltage value between the third magneto-resistor and the 4th magneto-resistor；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.
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