CN109374941B - Current measuring method and device for copper bar type lead - Google Patents
Current measuring method and device for copper bar type leadInfo
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- CN109374941B CN109374941B CN201811455342.7A CN201811455342A CN109374941B CN 109374941 B CN109374941 B CN 109374941B CN 201811455342 A CN201811455342 A CN 201811455342A CN 109374941 B CN109374941 B CN 109374941B
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- resistor
- bar type
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 180
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 180
- 239000010949 copper Substances 0.000 title claims abstract description 180
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000035945 sensitivity Effects 0.000 claims description 42
- 238000012545 processing Methods 0.000 claims description 36
- 230000006698 induction Effects 0.000 abstract description 41
- 238000005259 measurement Methods 0.000 abstract description 25
- 238000000691 measurement method Methods 0.000 abstract description 9
- 239000013598 vector Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003723 Smelting Methods 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
- 230000007423 decrease Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 238000005363 electrowinning Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention discloses a current measurement method and a current measurement device for a copper bar type lead, wherein one method comprises the following steps: acquiring magnetic induction intensities of a first position and a second position near the edge of a long side in the long side direction of the longitudinal section shape of the copper bar type lead to be detected, wherein the first position and the second position are respectively positioned at two sides of a short side of the longitudinal section shape; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; acquiring a difference value of magnetic induction intensities of the first position and the second position; and acquiring the current of the copper bar type lead to be tested according to the difference value. The current measuring method and the device for the copper bar type lead provided by the embodiment of the invention can accurately output the measuring result of the magnetic induction intensity when the copper bar type lead is electrified; in addition, the device is not easily affected by current frequency, has a wide frequency application range and has good frequency characteristics.
Description
Technical Field
The invention relates to the technical field of current sensors, in particular to a current measurement method and device for a copper bar type lead.
Background
As shown in fig. 1A, the copper bar-type wire is a flat electrical connector with a rectangular or rounded rectangular longitudinal section (i.e., a section perpendicular to the current flow direction), and the copper bar-type wire in the present application is not limited to copper but may be made of other materials. The copper bar type lead has larger single flow area, thus the dynamic stability and the thermal stability are better than those of the cable, thus being widely used for electrical engineering such as high-low voltage electrical appliances, switch contacts, distribution equipment, bus ducts and the like, and also being widely used for ultra-large current electrowinning engineering such as metal smelting, electrochemical plating, chemical caustic soda and the like. Typically, copper bar conductors are used to conduct or conduct current when the current load reaches or exceeds 250A.
The existing current measuring device is only suitable for current measurement of a circular section (such as a steel-cored aluminum strand), and due to the characteristics of special shape, large load current and irregular distribution of an induced magnetic field (particularly weak magnetic induction intensity at a certain position and difficulty in observation), the traditional current measuring device cannot accurately measure the current.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a method and a device for measuring current of a copper bar type wire, so as to solve the problem that the current of the copper bar type wire cannot be accurately measured by the existing method.
According to a first aspect, an embodiment of the present invention provides a current measurement method for a copper bar wire, including: acquiring magnetic induction intensities of a first position and a second position near the edge of a long side in the long side direction of the longitudinal section shape of the copper bar type lead to be detected, wherein the first position and the second position are respectively positioned at two sides of a short side of the longitudinal section shape; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; acquiring a difference value of magnetic induction intensities of the first position and the second position; and acquiring the current of the copper bar type lead to be tested according to the difference value.
According to a second aspect, an embodiment of the present invention provides a current measurement method for a copper bar type wire, including: a first magnetic resistor and a second magnetic resistor are distributed at a first position and a second position near the edge of the long side in the long side direction of the longitudinal section of the copper bar type lead to be tested, and the first position and the second position are respectively positioned at two sides of the short side of the longitudinal section; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; the magnetic sensitivity directions of the first magnetic resistor and the second magnetic resistor are parallel to the extending direction of the long side, and the magnetic sensitivity directions of the first magnetic resistor and the second magnetic resistor are the same; the first magnetic resistor and the second magnetic resistor are connected in series, and two ends after being connected in series are respectively connected with two ends of a power supply; acquiring a voltage value between the first magnetic resistor and the second magnetic resistor; and acquiring the current of the copper bar type lead to be tested according to the voltage value between the first magnetic resistor and the second magnetic resistor.
According to a third aspect, an embodiment of the present invention provides a current measurement method for a copper bar wire, including: arranging a first magnetic resistor, a second magnetic resistor, a third magnetic resistor and a fourth magnetic resistor at a first position and a second position near the edge of the long side in the long side direction of the longitudinal section shape of the copper bar type lead to be tested; the first position and the second position are respectively positioned at two sides of a short side of the longitudinal section shape, wherein the first magnetic resistor and the fourth magnetic resistor are arranged at the first position, and the second magnetic resistor and the third magnetic resistor are arranged at the second position; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; the magnetic sensitivity directions of the first magnetic resistor, the second magnetic resistor, the third magnetic resistor and the fourth magnetic resistor are the same and are parallel to the extending direction of the long side; the first magnetic resistor and the second magnetic resistor are connected in series, two ends after being connected in series are connected with two ends of a power supply, the third magnetic resistor and the fourth magnetic resistor are connected in series, two ends after being connected in series are connected with two ends of the power supply, and the first magnetic resistor and the third magnetic resistor are connected with the same power supply end; acquiring a first voltage value between the first magnetic resistor and the second magnetic resistor, and acquiring a second voltage value between the third magnetic resistor and the fourth magnetic resistor; and acquiring the current of the copper bar type lead to be tested according to the difference value of the first voltage value and the second voltage value.
Optionally, the method of the first aspect, the second aspect, or the third aspect further comprises: and enabling the copper bar type wires to be tested and other electrified copper bar type wires to be arranged side by side along the direction of the long side.
Optionally, the method of the first aspect, the second aspect, or the third aspect further comprises: and adjusting the first position and the second position corresponding to the copper bar type wire to be tested to be positioned on a connecting line of midpoints of two short sides of the adjacent electrified copper bar type wire.
According to a fourth aspect, an embodiment of the present invention provides a current measurement device for a copper bar type wire, including: the first magnetic sensing unit and the second magnetic sensing unit are respectively and fixedly arranged at a first position and a second position near the edge of the long side in the long side direction of the longitudinal section shape of the copper bar type lead to be tested, and the first position and the second position are respectively positioned at two sides of the short side of the longitudinal section shape; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; and the signal processing module is used for acquiring the difference value of the magnetic induction intensity of the first position and the second position and acquiring the current of the copper bar type wire to be tested according to the difference value.
According to a fifth aspect, an embodiment of the present invention provides a current measurement device for a copper bar type wire, including: the first magnetic resistor and the second magnetic resistor are arranged near the long edge of the copper bar wire to be tested in the long edge direction of the longitudinal section shape, and the positions of the first magnetic resistor and the second magnetic resistor are respectively positioned at two sides of the short edge of the longitudinal section shape; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; the magnetic sensitivity directions of the first magnetic resistor and the second magnetic resistor are parallel to the extending direction of the long side, and the magnetic sensitivity directions of the first magnetic resistor and the second magnetic resistor are the same; the first magnetic resistor and the second magnetic resistor are connected in series, and two ends after being connected in series are respectively connected with two ends of a power supply; and the input end of the signal processing module is connected between the first magnetic resistor and the second magnetic resistor, and is used for acquiring a voltage value between the first magnetic resistor and the second magnetic resistor and acquiring the current of the copper bar type wire to be tested according to the voltage value between the first magnetic resistor and the second magnetic resistor.
According to a sixth aspect, an embodiment of the present invention provides a current measurement device for a copper bar type wire, including: the first magnetic resistor, the second magnetic resistor, the third magnetic resistor and the fourth magnetic resistor are arranged at a first position and a second position near the edge of the long side in the long side direction of the longitudinal section shape of the copper bar type lead to be tested; the first position and the second position are respectively positioned at two sides of a short side of the longitudinal section shape, wherein the first magnetic resistor and the fourth magnetic resistor are arranged at the first position, and the second magnetic resistor and the third magnetic resistor are arranged at the second position; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; the magnetic sensitivity directions of the first magnetic resistor, the second magnetic resistor, the third magnetic resistor and the fourth magnetic resistor are the same and are parallel to the extending direction of the long side; the first magnetic resistor and the second magnetic resistor are connected in series, two ends after being connected in series are connected with two ends of a power supply, the third magnetic resistor and the fourth magnetic resistor are connected in series, two ends after being connected in series are connected with two ends of the power supply, and the first magnetic resistor and the third magnetic resistor are connected with the same power supply end; the first input end of the signal processing module is connected between the first magnetic resistor and the second magnetic resistor and used for acquiring a first voltage value between the first magnetic resistor and the second magnetic resistor, and the second input end of the signal processing module is connected between the third magnetic resistor and the fourth magnetic resistor and used for acquiring a second voltage value between the third magnetic resistor and the fourth magnetic resistor; the signal processing module is also used for obtaining the current of the copper bar type wire to be tested according to the difference value of the first voltage value and the second voltage value.
Optionally, in the apparatus of the fourth aspect, the fifth aspect or the sixth aspect, the signal processing module includes an operational amplifier.
Optionally, in the apparatus of the fourth aspect, the fifth aspect or the sixth aspect, the copper bar-type wire to be tested and other energized copper bar-type wires are arranged side by side along the direction of the long side.
Optionally, in the apparatus of the fourth aspect, the fifth aspect, or the sixth aspect, the magnetically sensitive position of the magnetic sensing unit corresponding to the copper bar type wire to be tested is located on a line between midpoints of two short sides of the adjacent energized copper bar type wire.
The current measuring method and the device for the copper bar type lead provided by the embodiment of the invention can accurately output the measuring result of the magnetic induction intensity when the copper bar type lead is electrified; in addition, the device is not easily affected by current frequency, has a wide frequency application range and has good frequency characteristics.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:
FIG. 1A shows a schematic diagram of a copper bar wire;
FIG. 1B shows a schematic diagram of the magnetic field distribution around an energized copper bar wire;
fig. 2A and 2B show a rule of distribution of magnetic induction intensity in the long side direction of the surface of the copper bar-type wire in the vicinity of the long side edge;
FIG. 3A is a flow chart of a method for measuring current in a copper bar wire according to an embodiment of the invention;
FIG. 3B is a schematic diagram showing a positional relationship between a magnetic sensing unit and a copper bar wire to be tested according to an embodiment of the present invention;
Fig. 3C is a schematic diagram showing frequency characteristics of a current measurement method of a copper bar wire according to an embodiment of the present invention;
FIG. 4A is a flow chart illustrating another method of measuring current in a copper bar wire in accordance with an embodiment of the present invention;
FIG. 4B shows a spatial positional relationship of two magnetoresistors;
FIG. 4C illustrates an electrical connection of the two magnetoresistors shown in FIG. 4B;
FIG. 4D is a schematic diagram showing electrical connections for an operational amplifier of FIG. 4C;
FIG. 5A shows a flow chart of a method of current measurement for a copper bar wire in accordance with yet another embodiment of the present invention;
FIG. 5B illustrates a spatial positional relationship of four magnetoresistors;
FIG. 5C illustrates one electrical connection of the four magnetoresistors shown in FIG. 5B;
FIG. 5D is a schematic diagram showing electrical connections for an operational amplifier of FIG. 5C;
FIG. 6A shows a schematic of a copper bar wire side-by-side arrangement;
FIG. 6B is a graph showing the error caused by the effect of adjacent conductive wires on the copper bar wire under test in a side-by-side arrangement of copper bar wires;
FIG. 7A is a detailed schematic of adjacent copper bar conductors arranged side by side;
Fig. 7B shows a schematic diagram of the direction of the magnetic induction intensity at different positions in fig. 7A.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The distribution of the magnetic field around the energized copper bar wire is shown in fig. 1B, where a represents the longitudinal cross section of the energized copper bar wire and the dashed line represents the magnetic induction wire. The inventors found that there is a rule as shown in fig. 2A in the distribution of the components of the magnetic induction intensity in the long-side direction near the long-side edge of the copper bar-type wire surface, that is: the component values of the magnetic induction intensity in the longitudinal direction of the copper bar type lead from one side of the short side to the other side of the short side in the longitudinal direction of the longitudinal section of the copper bar type lead are gradually reduced; and taking the position of the short side in the long side direction as the zero point of the abscissa, so that the numerical curve of the component of the magnetic induction intensity in the long side direction is basically centrosymmetric with respect to the intersection point on the longitudinal axis.
Further, the inventors studied the amount of change in the numerical value of the magnetic induction intensity component between two points at intervals of a predetermined distance (for example, 4 mm) in the longitudinal direction of the longitudinal cross-sectional shape of the copper bar-type wire (i.e., the slope of the curve shown in fig. 2A), and the results of the study are shown in fig. 2B. As can be seen from fig. 2B, the magnetic induction intensity has the largest amount of change in the value of the component in the long-side direction at the position where the short side is located in the long-side direction.
Based on the research results shown in fig. 2A and fig. 2B, the inventor proposes the current measurement method and device for the copper bar type wire according to the present application, and the scheme of the present application will be described in detail below.
In the present application, the direction of magnetic sensitivity is a direction vector, and includes both "a direction in which a positive output value of the magnetic sensor increases (also referred to as a positive magnetic sensitivity direction) when a magnetic field in the direction increases" and "a direction in which a positive output value of the magnetic sensor decreases (also referred to as a negative magnetic sensitivity direction) when a magnetic field in the direction increases".
The application also provides that: when only the magnetic sensitive direction is mentioned, the magnetic sensitive direction comprises a positive magnetic sensitive direction and a negative magnetic sensitive direction, and the positive direction and the negative direction are not distinguished; when the magnetic sensitivity directions are the same or opposite, the positive magnetic sensitivity direction and the negative magnetic sensitivity direction are distinguished, that is, "the same magnetic sensitivity direction" means that the magnetic sensitivity directions are both positive magnetic sensitivity directions or both negative magnetic sensitivity directions, and "the magnetic sensitivity directions are opposite" means that one is positive magnetic sensitivity direction and the other is negative magnetic sensitivity direction.
Example 1
Fig. 3A shows a flow chart of a method for measuring current of a copper bar type wire according to an embodiment of the present invention. As shown in fig. 3A, the method includes the steps of:
S101: and acquiring magnetic induction intensities of a first position and a second position near the edge of the long side in the long side direction of the longitudinal section shape of the copper bar type lead to be tested, wherein the first position and the second position are respectively positioned at two sides of the short side of the longitudinal section shape. The longitudinal section of the copper bar type lead to be tested is rectangular or round-corner rectangular.
S102: and acquiring a difference value of the magnetic induction intensities of the first position and the second position.
S103: and obtaining the current of the copper bar type lead to be tested according to the difference value.
As shown in fig. 3B, a represents a longitudinal section of the copper bar-type wire under test, and "×" represents a direction of current flowing in the copper bar-type wire under test (i.e., from one side of the paper or screen on which the reader is located to the other side). X, Y denotes a first position and a second position for setting the magnetic sensor unit, the first position X and the second position Y are located in a long side direction of the longitudinal cross-sectional shape (i.e., a line connecting the two is parallel to the long side), near an edge of the long side, and the first position X and the second position Y are located on both sides of a short side of the longitudinal cross-sectional shape, respectively.
The magnetic sensing unit in the application can be a single magnetic resistor, a plurality of magnetic resistors, a Hall sensor or a unit similar to the Hall sensor and capable of sensing magnetic induction intensity.
According to the research result shown in fig. 2B, it can be seen that the position where the short side is located in the long side direction has the largest value variation of the component of the magnetic induction intensity in the long side direction, so that the measurement result is convenient to output, the measurement result is not easy to be disturbed due to the fact that the output value is too small, and the measurement result is accurate. Therefore, the current measuring method of the copper bar type lead provided by the embodiment of the invention can accurately output the measuring result of the magnetic induction intensity when the copper bar type lead is electrified.
The inventor also researches the frequency characteristic of the current measuring method of the copper bar type lead wire, and the specific method comprises the following steps: introducing 1Hz current to the copper bar type lead to be tested, and taking the measurement result at the moment as a reference value; and gradually increasing the frequency of the current, respectively obtaining measurement results, and dividing the measurement results by a reference value to obtain normalized measurement results. As shown in fig. 3C, it can be seen that the measurement result hardly changes when a current having a frequency of about 100Hz and 100Hz or less is applied to the copper bar-type wire to be measured. Therefore, the current measuring method of the copper bar type lead wire is not easily affected by current frequency, has a wide frequency application range and has good frequency characteristics.
Example two
Fig. 4A shows a flow chart of another method of measuring current in a copper bar type wire according to an embodiment of the present invention. As shown in fig. 4A, the method includes the steps of:
S201: the first magnetic resistor and the second magnetic resistor are distributed at a first position and a second position near the edge of the long side in the long side direction of the longitudinal section shape of the copper bar type lead to be tested, and the first position and the second position are respectively positioned at two sides of the short side of the longitudinal section shape; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; the magnetic sensitivity directions of the first magnetic resistor and the second magnetic resistor are parallel to the extending direction of the long side, and the magnetic sensitivity directions of the first magnetic resistor and the second magnetic resistor are the same; the first magnetic resistor and the second magnetic resistor are connected in series, and two ends after being connected in series are respectively connected with two ends of a power supply.
S202: and acquiring a voltage value between the first magnetic resistor and the second magnetic resistor.
S203: and acquiring the current of the copper bar type lead wire to be tested according to the voltage value between the first magnetic resistor and the second magnetic resistor.
As shown in fig. 4B, a represents a longitudinal section of the copper bar wire to be tested, and "×" represents passing a current. X, Y shows a first position and a second position for setting a first magnetic resistor and a second magnetic resistor of the magnetic sensing unit, respectively, and the specific definition of the first position and the second position is shown in the first embodiment. The difference between this embodiment and the first embodiment is that the first magnetic resistor 41 and the second magnetic resistor 42 are respectively disposed at the first position X and the second position Y, and the magnetic sensitivity directions of the first magnetic resistor 41 and the second magnetic resistor 42 are the same (as shown by the arrow in fig. 4B) and are parallel to the direction of the long side; as shown in fig. 4C, the first magnetic resistor 41 and the second magnetic resistor 42 are connected in series, and both ends after the series connection are respectively connected to both ends of the power supply.
Let R 1＝R0+k·B1 be the first magnetic resistance 41, wherein R 0 be the resistance value of the first magnetic resistance 41 when the magnetic induction is zero, B 1 be the magnetic induction where the first magnetic resistance 41 is located, and k be the rate of change of the first magnetic resistance 41; the resistance value of the second magnetic resistor 42 is R 2＝R0+k·B2, where R 0 is the resistance value of the second magnetic resistor 42 when the magnetic induction intensity is zero (the resistance values of the first magnetic resistor 41 and the second magnetic resistor 42 are equal when the magnetic induction intensity is zero), B 2 is the magnetic induction intensity where the second magnetic resistor 42 is located, and k is the change rate of the second magnetic resistor 42. Then, the voltage between the first magnetic resistor 41 and the second magnetic resistor 42 is
Wherein V cc is the supply voltage.
When no current is applied to the copper bar type wire to be tested, the voltage between the first magnetic resistor 41 and the second magnetic resistor 42 is V 0＝Vcc/2. Therefore, the difference in output voltage between the first and second magnetic resistors 41 and 42 before and after energization is:
It should be noted that, in the last step of the derivation of the above formula (1), since the value of R 0 is often far greater than the values of B 1 and B 2 in practical situations, k· (B 1+B2) may be approximately 0, so as to obtain the final result of the above formula (1).
As can be seen from the final result of the above formula (1), the difference of the output voltages between the first and second magnetic resistors 41 and 42 is proportional to the difference of the magnetic induction intensities at the positions of the first and second magnetic resistors 41 and 42 before and after the energization. Therefore, according to the difference between the voltage value output between the first magnetic resistor 41 and the second magnetic resistor 42 and the reference value (the reference value may be selected to be half of the power voltage value or may be other fixed value) when the copper bar type wire to be tested is powered on, the current of the copper bar type wire to be tested can be obtained.
The current measuring method of the copper bar type lead provided by the embodiment of the invention can accurately output the measuring result of the magnetic induction intensity when the copper bar type lead is electrified, and has better frequency characteristic. Please refer to embodiment one.
The steps S202 and S203 may be performed by using an operational amplifier and its peripheral circuits, as shown in fig. 4D, where V o is the voltage between the first magnetic resistor 41 and the second magnetic resistor 42 when the copper bar wire to be tested is powered on, and V ref may be set to half the power supply voltage, i.e. V cc/2. The steps S202 and S203 may be performed by a module including a processor chip, or may be performed by other electronic circuits, which is not limited by the present application.
Example III
Fig. 5A shows a flow chart of another method of measuring current in a copper bar type wire according to an embodiment of the present invention. As shown in fig. 5A, the method includes the steps of:
S301: arranging a first magnetic resistor, a second magnetic resistor, a third magnetic resistor and a fourth magnetic resistor at a first position and a second position near the edge of the long side in the long side direction of the longitudinal section shape of the copper bar type lead to be tested; the first position and the second position are respectively positioned at two sides of a short side of the longitudinal section shape, wherein the first magnetic resistor and the fourth magnetic resistor are arranged at the first position, and the second magnetic resistor and the third magnetic resistor are arranged at the second position; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; the magnetic sensitivity directions of the first magnetic resistor, the second magnetic resistor, the third magnetic resistor and the fourth magnetic resistor are the same and are parallel to the extending direction of the long side; the first magnetic resistor and the second magnetic resistor are connected in series, two ends of the series connection are connected with two ends of a power supply, the third magnetic resistor and the fourth magnetic resistor are connected in series, two ends of the series connection are connected with two ends of the power supply, and the first magnetic resistor and the third magnetic resistor are connected with the same power supply.
S302: a first voltage value between the first magnetic resistor and the second magnetic resistor is obtained, and a second voltage value between the third magnetic resistor and the fourth magnetic resistor is obtained.
S303: and acquiring the current of the copper bar type wire to be tested according to the difference value of the first voltage value and the second voltage value.
As shown in fig. 5B, a represents a longitudinal section of the copper bar wire to be tested, and "×" represents passing a current. X, Y are a first position and a second position for setting the first magnetic resistor 51, the second magnetic resistor 52, the third magnetic resistor 53, and the fourth magnetic resistor 54 of the magnetic sensor unit, respectively, and the specific definition of the first position and the second position is shown in the first embodiment. The difference between this embodiment and the first embodiment is that the first magnetic resistor 51 and the fourth magnetic resistor 54 are disposed at the first position, the second magnetic resistor 52 and the third magnetic resistor 53 are disposed at the second position, and the magnetic sensitivity directions of the first magnetic resistor 51, the second magnetic resistor 52, the third magnetic resistor 53, and the fourth magnetic resistor 54 are the same (as shown by the arrows in fig. 5B), and are all parallel to the direction of the long side; as shown in fig. 5C, the first magnetic resistor 51 and the second magnetic resistor 52 are connected in series, the two ends after the series connection are connected to the two ends of the power supply, the third magnetic resistor 53 and the fourth magnetic resistor 54 are connected in series, the two ends after the series connection are connected to the two ends of the power supply, wherein the first magnetic resistor 51 and the third magnetic resistor 53 are connected to the same power supply. V-in fig. 5C is a first voltage value between the first magnetic resistor 51 and the second magnetic resistor 52, and v+ is a second voltage value between the third magnetic resistor 52 and the fourth magnetic resistor 54. Since the first magnetic resistor 51 and the fourth magnetic resistor 54 are located on one side of the short side and the second magnetic resistor 52 and the third magnetic resistor 53 are located on the other side of the short side in terms of space arrangement, the result measured by the branch of the first magnetic resistor 51 and the second magnetic resistor 52 (i.e. the result of processing the first voltage V-in fig. 5C) is opposite to the result measured by the branch of the third magnetic resistor 53 and the fourth magnetic resistor 54 (i.e. the result of processing the second voltage v+ in fig. 5C), and the absolute value of any one of them can be deduced by the method described in the second embodiment (the application is not repeated here), and the result obtained by the difference processing according to the first voltage V-and the second voltage v+ is 2 times the output result of the technical scheme described in the second embodiment. It can be seen that the present embodiment has higher interference immunity than the present embodiment.
The current measuring method of the copper bar type lead provided by the embodiment of the invention can accurately output the measuring result of the magnetic induction intensity when the copper bar type lead is electrified, and has better frequency characteristic. Please refer to embodiment one.
Example IV
The embodiment of the invention provides a current measurement method of a copper bar wire, which is different from any one of the first to third embodiments in that the method further comprises: the copper bar type wires to be tested and other electrified copper bar type wires are arranged side by side along the long side direction.
As shown in fig. 6A, the copper bar-type wire a to be tested and the other energized copper bar-type wires B, C are arranged side by side along the long side direction of the longitudinal cross-sectional shape of the copper bar-type wire a to be tested.
Referring to fig. 6A, a dashed elliptic curve represents a magnetic induction curve of an energized copper bar wire B, which is perpendicular to a center line (dashed line OO 'in the drawing) of a plurality of wires arranged side by side, and a distance d1 between the magnetic sensing unit X and the center line OO' is short because the magnetic sensing unit or the magnetoresistive element (denoted by X in the drawing) is arranged near the long side edge. Therefore, at the position of the magnetic sensing unit or the magnetic resistor X, the component of the magnetic induction curve of the energized copper bar wire B in the direction parallel to the long side is almost zero. The magnetic sensitivity direction of the magnetic sensing unit on the surface of the copper bar type lead A to be tested is parallel to the long side, so that when the copper bar type lead to be tested and other electrified copper bar type leads are arranged side by side along the direction of the long side, the magnetic fields of the adjacent electrified leads can not have larger influence on the measurement result.
In this regard, the inventors have also made experimental verification that, as shown in fig. 6B, the horizontal axis represents the pitch of the adjacent copper bar-type wires (i.e., the distance between the corresponding positions of the adjacent copper bar-type wires, e.g., the distance d2 shown in fig. 6A), and the vertical axis represents the error caused by the influence of the adjacent energized wires on the measurement result. Taking the example that the magnetic sensor unit is arranged at the right edge of the copper bar type wire to be measured, curve 1 represents the influence of the adjacent electrified copper bar type wire on the right on the measurement result of the copper bar type wire to be measured, and curve 2 represents the influence of the adjacent electrified copper bar type wire on the left on the measurement result of the copper bar type wire to be measured. Therefore, when the magnetic sensor unit is arranged at the right edge of the copper bar type lead to be tested, the measurement result is greatly influenced by the adjacent electrified lead on the right side and less influenced by the left side; even if the distance between the adjacent copper bar type wires is as small as 3cm, the error is only about 2.0%, and the data prove that the magnetic field of the adjacent energizing wires does not have great influence on the measurement result when the copper bar type wires to be measured and other energized copper bar type wires are arranged side by side along the long-side direction. Based on the conclusion, the current measuring method of the copper bar type wire can reduce the influence of the adjacent energizing wires on the measuring result by arranging the energizing copper bar type wires side by side along the long-side direction.
Alternatively, according to fig. 6B, a pitch of adjacent copper bar type wires may be set to not less than 3cm.
Example five
The embodiment of the invention provides a current measurement method for a copper bar wire, which is different from any one of the first to fourth embodiments in that the method further comprises: the first position and the second position corresponding to the copper bar type lead to be measured are adjusted to be positioned on the connecting line of the midpoints of the two short sides of the adjacent electrified copper bar type lead.
As shown in fig. 7A, assuming that a is a copper bar type wire to be tested, X represents a magnetic sensing unit or a magnetic resistor corresponding to the copper bar type wire to be tested, which is disposed near the edge of the long side, PP 'is a line connecting the midpoints of two short sides of the energized copper bar type wire B adjacent to the copper bar type wire to be tested, and the present embodiment is designed to adjust the magnetically sensitive position of the magnetic sensing unit or the magnetic resistor X on the PP' line.
Although X is located near the long edge of A, there is a distance between the magnetically sensitive location of X and the surface of A (even very small, it affects the component of the magnetic induction vector in the magnetically sensitive direction). When the position of the magnetic sensing unit or the magnetic resistor X is set on the magnetic induction line B to be the XO point, and the position of the surface a is set to be the AO point, those skilled in the art will readily understand that the magnetic induction at these two points is shown in fig. 7B, where the solid arrows represent magnetic induction vectors, and the dotted arrows represent components of the vectors (i.e., components in the direction of magnetic sensitivity, components perpendicular to the direction of magnetic sensitivity). As can be seen from fig. 7B, since the XO point is located on the PP' connection line, the magnetic induction vector at the XO point is perpendicular to the magnetic sensitivity direction, and thus the component of the magnetic induction vector at the XO point in the magnetic sensitivity direction is 0; however, since the magnetic induction vector at the AO point cannot intersect perpendicularly with the magnetic sensitivity direction, the magnetic induction vector at the AO point necessarily has a component in the magnetic sensitivity direction. The magnetic sensing unit or the magnetic resistor is arranged to measure the magnetic field intensity of the copper bar type wire to be measured in the magnetic sensitivity direction, so that the smaller the influence of the magnetic field intensity sensed by the magnetic sensing unit or the magnetic resistor in the magnetic sensitivity direction is on the adjacent copper bar type wire, the more accurate the measurement result is, and compared with the arrangement at the AO position, the measurement accuracy of the copper bar type wire to be measured can be further improved by arranging the magnetic sensing unit or the magnetic resistor at the XO position.
Example six
The embodiment of the invention provides a current measuring device of a copper bar type wire, which can be used for executing the method described in the embodiment or any optional implementation mode thereof. The device comprises a first magnetic sensing unit, a second magnetic sensing unit and a signal processing module.
The first magnetic sensing unit and the second magnetic sensing unit are respectively and fixedly arranged at a first position and a second position near the edge of the long side in the long side direction of the longitudinal section shape of the copper bar type lead to be tested, and the first position and the second position are respectively positioned at two sides of the short side of the longitudinal section shape; the longitudinal section of the copper bar type lead to be tested is rectangular or round-corner rectangular.
The signal processing module is used for obtaining the difference value of the magnetic induction intensity of the first position and the second position and obtaining the current of the copper bar type wire to be tested according to the difference value. Referring specifically to fig. 3B and embodiment one.
The signal processing module may be a module including a processor chip, an operational amplifier and its peripheral circuit, or other electronic circuits, which is not limited by the present application.
The current measuring device of the copper bar type lead can accurately output the measuring result of the magnetic induction intensity when the copper bar type lead is electrified. Please refer to embodiment one.
Optionally, the magnetic sensing unit and the copper bar type wire to be tested are arranged through a fixing device, and the signal processing module can be arranged independently of the fixing device or can be arranged on the fixing device. When the signal processing module is arranged on the fixing device, the fixing device is provided with a PCB board, the PCB board is provided with the magnetic sensing unit and the signal processing module, and during measurement, the magnetic sensor unit on the PCB is only required to be placed at the edge of the long side of the longitudinal section shape of the copper bar type lead to be measured.
Example seven
The embodiment of the invention provides a current measuring device of a copper bar type wire, which can be used for executing the method described in the second embodiment or any optional implementation mode thereof. The device comprises a first magnetic resistor, a second magnetic resistor and a signal processing module.
The first magnetic resistor and the second magnetic resistor are arranged near the edge of the long side of the longitudinal section of the copper bar wire to be tested, and the positions of the first magnetic resistor and the second magnetic resistor are respectively positioned at two sides of the short side of the longitudinal section; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; the magnetic sensitivity directions of the first magnetic resistor and the second magnetic resistor are parallel to the extending direction of the long side, and the magnetic sensitivity directions of the first magnetic resistor and the second magnetic resistor are the same; the first magnetic resistor and the second magnetic resistor are connected in series, and two ends after being connected in series are respectively connected with two ends of a power supply. The input end of the signal processing module is connected between the first magnetic resistor and the second magnetic resistor and used for acquiring a voltage value between the first magnetic resistor and the second magnetic resistor and acquiring current of the copper bar type lead wire to be tested according to the voltage value between the first magnetic resistor and the second magnetic resistor. Please refer to fig. 4B and embodiment two.
The signal processing module may be a module including a processor chip, an operational amplifier and its peripheral circuit, or other electronic circuits, which is not limited by the present application. Alternatively, the signal processing module may include an operational amplifier as shown in fig. 4D, where Vo is an input terminal and Vout is an output terminal in fig. 4D.
Optionally, the position relationship between the magnetic resistor and the copper bar type wire to be tested is set through the fixing device, and the signal processing module can be set independently of the fixing device or can be set on the fixing device. When the signal processing module is arranged on the fixing device, the fixing device is provided with a PCB board, the PCB board is provided with a magnetic resistor and the signal processing module, and during measurement, the magnetic resistor on the PCB is only required to be placed at the edge of the long side of the longitudinal section shape of the copper bar type lead to be measured.
Example eight
The embodiment of the invention provides a current measuring device of a copper bar type wire, which can be used for executing the method described in the third embodiment or any optional implementation mode thereof. The device comprises a first magnetic resistor, a second magnetic resistor, a third magnetic resistor, a fourth magnetic resistor and a signal processing module.
The first magnetic resistor, the second magnetic resistor, the third magnetic resistor and the fourth magnetic resistor are arranged at a first position and a second position near the edge of the long side in the long side direction of the longitudinal section shape of the copper bar type lead to be tested; the first position and the second position are respectively positioned at two sides of a short side of the longitudinal section shape, wherein the first magnetic resistor and the fourth magnetic resistor are arranged at one side of the short side, and the second magnetic resistor and the third magnetic resistor are arranged at the other side of the short side; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; the magnetic sensitivity directions of the first magnetic resistor, the second magnetic resistor, the third magnetic resistor and the fourth magnetic resistor are the same and are parallel to the extending direction of the long side; the first magnetic resistor and the second magnetic resistor are connected in series, two ends of the series connection are connected with two ends of a power supply, the third magnetic resistor and the fourth magnetic resistor are connected in series, two ends of the series connection are connected with two ends of the power supply, and the first magnetic resistor and the third magnetic resistor are connected with the same power supply. The first input end of the signal processing module is connected between the first magnetic resistor and the second magnetic resistor and used for acquiring a first voltage value between the first magnetic resistor and the second magnetic resistor, and the second input end of the signal processing module is connected between the third magnetic resistor and the fourth magnetic resistor and used for acquiring a second voltage value between the third magnetic resistor and the fourth magnetic resistor; the signal processing module is also used for obtaining the current of the copper bar type lead wire to be tested according to the difference value of the first voltage value and the second voltage value. Please refer to fig. 5B and embodiment three.
The signal processing module may be a module including a processor chip, an operational amplifier and its peripheral circuit, or other electronic circuits, which is not limited by the present application. Alternatively, the signal processing module may be an operational amplifier as shown in fig. 5D, where v+ in fig. 5D is a first input terminal, V-is a second input terminal, and Vout is an output terminal.
Optionally, the position relationship between the magnetic resistor and the copper bar type wire to be tested is set through the fixing device, and the signal processing module can be set independently of the fixing device or can be set on the fixing device. When the signal processing module is arranged on the fixing device, the fixing device is provided with a PCB board, the PCB board is provided with a magnetic resistor and the signal processing module, and during measurement, the magnetic resistor on the PCB is only required to be placed at the edge of the long side of the longitudinal section shape of the copper bar type lead to be measured.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations are within the scope of the invention as defined by the appended claims.
Claims (9)
1. A method for measuring current of a copper bar wire, comprising:
Magnetic sensing units are distributed at a first position and a second position near the edge of the long side in the long side direction of the longitudinal section of the copper bar type lead to be tested, the magnetic sensing units comprise a first magnetic resistor and a second magnetic resistor, and the first position and the second position are respectively positioned at two sides of the short side of the longitudinal section; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; the magnetic sensitivity directions of the first magnetic resistor and the second magnetic resistor are parallel to the extending direction of the long side, and the magnetic sensitivity directions of the first magnetic resistor and the second magnetic resistor are the same; the first magnetic resistor and the second magnetic resistor are connected in series, and two ends after being connected in series are respectively connected with two ends of a power supply;
acquiring a voltage value between the first magnetic resistor and the second magnetic resistor;
and acquiring the current of the copper bar type lead to be tested according to the voltage value between the first magnetic resistor and the second magnetic resistor.
2. A method for measuring current of a copper bar wire, comprising:
arranging magnetic sensing units at a first position and a second position near the edge of the long side in the long side direction of the longitudinal section shape of the copper bar type lead to be tested, wherein the magnetic sensing units comprise a first magnetic resistor, a second magnetic resistor, a third magnetic resistor and a fourth magnetic resistor; the first position and the second position are respectively positioned at two sides of a short side of the longitudinal section shape, wherein the first magnetic resistor and the fourth magnetic resistor are arranged at the first position, and the second magnetic resistor and the third magnetic resistor are arranged at the second position; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; the magnetic sensitivity directions of the first magnetic resistor, the second magnetic resistor, the third magnetic resistor and the fourth magnetic resistor are the same and are parallel to the extending direction of the long side; the first magnetic resistor and the second magnetic resistor are connected in series, two ends after being connected in series are connected with two ends of a power supply, the third magnetic resistor and the fourth magnetic resistor are connected in series, two ends after being connected in series are connected with two ends of the power supply, and the first magnetic resistor and the third magnetic resistor are connected with the same power supply end;
acquiring a first voltage value between the first magnetic resistor and the second magnetic resistor, and acquiring a second voltage value between the third magnetic resistor and the fourth magnetic resistor;
And acquiring the current of the copper bar type lead to be tested according to the difference value of the first voltage value and the second voltage value.
3. The method for measuring current of a copper bar type wire according to claim 1 or 2, characterized in that the method further comprises:
And enabling the copper bar type wires to be tested and other electrified copper bar type wires to be arranged side by side along the direction of the long side.
4. The method for measuring current of a copper bar type wire according to claim 1 or 2, characterized in that the method further comprises:
And adjusting the first position and the second position corresponding to the copper bar type wire to be tested to be positioned on a connecting line of midpoints of two short sides of the adjacent electrified copper bar type wire.
5. A current measuring device for a copper bar wire, comprising:
The magnetic sensing unit comprises a first magnetic resistor and a second magnetic resistor, is arranged near the edge of the long side of the longitudinal section of the copper bar type lead to be tested, and is respectively positioned at two sides of the short side of the longitudinal section; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; the magnetic sensitivity directions of the first magnetic resistor and the second magnetic resistor are parallel to the extending direction of the long side, and the magnetic sensitivity directions of the first magnetic resistor and the second magnetic resistor are the same; the first magnetic resistor and the second magnetic resistor are connected in series, and two ends after being connected in series are respectively connected with two ends of a power supply;
And the input end of the signal processing module is connected between the first magnetic resistor and the second magnetic resistor, and is used for acquiring a voltage value between the first magnetic resistor and the second magnetic resistor and acquiring the current of the copper bar type wire to be tested according to the voltage value between the first magnetic resistor and the second magnetic resistor.
6. A current measuring device for a copper bar wire, comprising:
The magnetic sensing unit comprises a first magnetic resistor, a second magnetic resistor, a third magnetic resistor and a fourth magnetic resistor, and is arranged at a first position and a second position near the edge of the long side in the long side direction of the longitudinal section shape of the copper bar type lead to be tested; the first position and the second position are respectively positioned at two sides of a short side of the longitudinal section shape, wherein the first magnetic resistor and the fourth magnetic resistor are arranged at the first position, and the second magnetic resistor and the third magnetic resistor are arranged at the second position; the longitudinal section of the copper bar type lead to be tested is rectangular or rounded rectangle; the magnetic sensitivity directions of the first magnetic resistor, the second magnetic resistor, the third magnetic resistor and the fourth magnetic resistor are the same and are parallel to the extending direction of the long side; the first magnetic resistor and the second magnetic resistor are connected in series, two ends after being connected in series are connected with two ends of a power supply, the third magnetic resistor and the fourth magnetic resistor are connected in series, two ends after being connected in series are connected with two ends of the power supply, and the first magnetic resistor and the third magnetic resistor are connected with the same power supply end;
the first input end of the signal processing module is connected between the first magnetic resistor and the second magnetic resistor and used for acquiring a first voltage value between the first magnetic resistor and the second magnetic resistor, and the second input end of the signal processing module is connected between the third magnetic resistor and the fourth magnetic resistor and used for acquiring a second voltage value between the third magnetic resistor and the fourth magnetic resistor; the signal processing module is also used for obtaining the current of the copper bar type wire to be tested according to the difference value of the first voltage value and the second voltage value.
7. The apparatus according to claim 5 or 6, wherein the signal processing module includes an operational amplifier.
8. The apparatus according to claim 5 or 6, wherein the copper bar type wire to be measured and other energized copper bar type wires are arranged side by side in the direction of the long side.
9. The current measuring device of claim 5 or 6, wherein the magnetically sensitive position of the magnetic sensor unit corresponding to the copper bar type wire to be measured is located on a line between midpoints of two short sides of the adjacent energized copper bar type wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811455342.7A CN109374941B (en) | 2018-11-30 | Current measuring method and device for copper bar type lead |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811455342.7A CN109374941B (en) | 2018-11-30 | Current measuring method and device for copper bar type lead |
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| Publication Number | Publication Date |
|---|---|
| CN109374941A CN109374941A (en) | 2019-02-22 |
| CN109374941B true CN109374941B (en) | 2024-07-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209446649U (en) * | 2018-11-30 | 2019-09-27 | 无锡乐尔科技有限公司 | The current measuring device of copper bar type conducting wire |
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209446649U (en) * | 2018-11-30 | 2019-09-27 | 无锡乐尔科技有限公司 | The current measuring device of copper bar type conducting wire |
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