CN117572061B - Electric signal acquisition assembly, current detection method and electric energy meter - Google Patents
Electric signal acquisition assembly, current detection method and electric energy meter Download PDFInfo
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- CN117572061B CN117572061B CN202410064802.2A CN202410064802A CN117572061B CN 117572061 B CN117572061 B CN 117572061B CN 202410064802 A CN202410064802 A CN 202410064802A CN 117572061 B CN117572061 B CN 117572061B
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- 210000001503 joint Anatomy 0.000 claims abstract description 34
- 230000035945 sensitivity Effects 0.000 claims description 31
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- 238000005259 measurement Methods 0.000 description 4
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- 230000005358 geomagnetic field Effects 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/186—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using current transformers with a core consisting of two or more parts, e.g. clamp-on type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
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Abstract
The embodiment of the invention provides an electric signal acquisition assembly, a current detection method and an electric energy meter, and relates to the technical field of electric power, wherein the electric signal acquisition assembly comprises: the first magnetic piece and the second magnetic piece are arc-shaped magnetic pieces, the first magnetic piece and the second magnetic piece can be in butt joint, and a first coil is wound on the first magnetic piece; the first magnetic resistance sensing unit and the second magnetic resistance sensing unit are respectively arranged at a first butt joint position and a second butt joint position of the first magnetic piece and the second magnetic piece; the signal acquisition unit comprises a first interface, a second interface and a third interface, wherein the first interface is electrically connected with the first magnetic resistance sensing unit, the second interface is electrically connected with the second magnetic resistance sensing unit, and the third interface is electrically connected with the first coil. The double magnetic resistance sensing units can offset the influence of the interference magnetic field, and accuracy of current collection is improved.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to an electric signal acquisition assembly, a current detection method and an electric energy meter.
Background
The communication base station needs to measure the electric energy, and at present, the electric energy measurement is usually obtained by clamping a sensor on a cable and calculating through a current signal acquired by the sensor.
However, when the communication base station load device is in a sleep state at night, the current flowing through the cable is small, and a large error exists in the current signal collected by the sensor due to the interference of the external interference magnetic field (for example, the geomagnetic field, the transformer devices around the communication base station, etc.).
Disclosure of Invention
The embodiment of the invention provides an electric signal acquisition component, a current detection method and an electric energy meter, which are used for solving the problem of larger error of an acquired electric signal in the prior art.
The embodiment of the invention provides an electric signal acquisition assembly, which comprises:
the first magnetic piece and the second magnetic piece are arc-shaped magnetic pieces, the first magnetic piece and the second magnetic piece can be in butt joint, and a first coil is wound on the first magnetic piece;
the first magnetic resistance sensing unit and the second magnetic resistance sensing unit are respectively arranged at a first butt joint position and a second butt joint position of the first magnetic piece and the second magnetic piece;
the signal acquisition unit comprises a first interface, a second interface and a third interface, wherein the first interface is electrically connected with the first magnetic resistance sensing unit, the second interface is electrically connected with the second magnetic resistance sensing unit, and the third interface is electrically connected with the first coil;
when the first magnetic piece and the second magnetic piece are arranged on the periphery of the cable to be tested, and the first magnetic piece and the second magnetic piece are in butt joint, the signal acquisition unit acquires a first signal of the first magnetic resistance sensing unit through the first interface, the signal acquisition unit acquires a second signal of the second magnetic resistance sensing unit through the second interface, the signal acquisition unit acquires a third signal of the first coil through the third interface, the first signal and the second signal are differential mode signals, and the third signal is an electromagnetic signal generated when current in the cable to be tested passes through.
Optionally, the sensor further comprises a sensitivity adjusting unit, wherein the second magnetic piece is wound with a second coil, the sensitivity adjusting unit comprises a fourth interface, a fifth interface and a sixth interface, the fourth interface is electrically connected with the first magnetic resistance sensing unit, the fifth interface is electrically connected with the second magnetic resistance sensing unit, and the sixth interface is electrically connected with the second coil;
before the first magnetic piece and the second magnetic piece are in butt joint, the sensitivity adjusting unit provides preset alternating current excitation for the second coil through the sixth interface, outputs first power supply voltage to the first magnetic resistance sensing unit through the fourth interface, and outputs second power supply voltage to the second magnetic resistance sensing unit through the fifth interface, so that the sensitivities of the first magnetic resistance sensing unit and the second magnetic resistance sensing unit are the same.
Optionally, the signal acquisition unit further comprises a low-pass filter, and the low-pass filter is used for filtering the alternating current excitation signal generated by the second coil.
Optionally, at the first butt joint position, a first groove is formed on the second magnetic piece, and the first magnetic resistance sensing unit is arranged in the first groove;
and a second groove is formed in the second magnetic part at the second butt joint position, and the second magnetic resistance sensing unit is arranged in the second groove.
Optionally, the signal acquisition device further comprises a housing, the housing comprises a first housing and a second housing, the first housing and the second housing are detachably connected, the first housing is provided with a first accommodating cavity for accommodating the first magnetic piece, the second housing is provided with a second accommodating cavity for accommodating the second magnetic piece, the second accommodating cavity is further provided with a first magnetic resistance sensing unit and a second magnetic resistance sensing unit, the first magnetic resistance sensing unit and the second magnetic resistance sensing unit are close to the first accommodating cavity, the second housing is further provided with a third accommodating cavity, and the third accommodating cavity is used for accommodating the signal acquisition unit.
Optionally, a hinge structure is disposed at a first connection position of the first housing and the second housing, and a buckle structure is disposed at a second connection position of the first housing and the second housing.
Optionally, the first magneto-resistive sensing unit and the second magneto-resistive sensing unit are symmetrically arranged.
Optionally, the first magneto-resistive sensing unit is the same as the second magneto-resistive sensing unit, and the first magneto-resistive sensing unit and the second magneto-resistive sensing unit each comprise a tunnel magneto-resistance sensor.
The embodiment of the invention also provides a current detection method which is applied to the electric signal acquisition assembly and comprises the following steps:
arranging the first magnetic piece and the second magnetic piece on the periphery of the cable to be tested, and butting the first magnetic piece and the second magnetic piece;
acquiring the first signal of the first magnetic resistance sensing unit acquired by the signal acquisition unit through the first interface, the second signal of the second magnetic resistance sensing unit acquired by the signal acquisition unit through the second interface, and the third signal of the first coil acquired by the signal acquisition unit through the third interface;
and determining the current of the cable to be tested according to the third signal after the first signal and the second signal are subjected to difference.
The embodiment of the invention also provides an electric energy meter, which comprises the electric signal acquisition assembly.
In the embodiment of the invention, the first magnetic piece and the second magnetic piece are abutted to encircle the cable to be measured, the first magnetic piece and the second magnetic piece can play a role in gathering magnetism in a magnetic field generated by current in the cable to be measured, and the first magnetic resistance sensing unit and the second magnetic resistance sensing unit are arranged at the abutted position of the first magnetic piece and the second magnetic piece.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an electrical signal acquisition assembly according to an embodiment of the present invention;
FIG. 2 is a second schematic diagram of an electrical signal acquisition assembly according to an embodiment of the present invention;
FIG. 3 is a third schematic diagram of an electrical signal acquisition assembly according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an electrical signal acquisition assembly according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an electrical signal acquisition assembly according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an electrical signal acquisition assembly according to an embodiment of the present invention;
fig. 7 is a flow chart of a current detection method according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the 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 be within the scope of the invention.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the structures so used are interchangeable under appropriate circumstances such that embodiments of the invention are capable of operation in sequences other than those illustrated or otherwise described herein, and that the objects identified by "first," "second," etc. are generally of a type and do not limit the number of objects, for example, the first object can be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
An embodiment of the present invention provides an electrical signal acquisition assembly, as shown in fig. 1 to 2, including:
the first magnetic piece and the second magnetic piece are arc-shaped magnetic pieces, the first magnetic piece and the second magnetic piece can be in butt joint, and a first coil is wound on the first magnetic piece;
the first magnetic resistance sensing unit and the second magnetic resistance sensing unit are respectively arranged at a first butt joint position and a second butt joint position of the first magnetic piece and the second magnetic piece;
the signal acquisition unit comprises a first interface, a second interface and a third interface, wherein the first interface is electrically connected with the first magnetic resistance sensing unit, the second interface is electrically connected with the second magnetic resistance sensing unit, and the third interface is electrically connected with the first coil;
when the first magnetic piece and the second magnetic piece are arranged on the periphery of the cable to be tested, and the first magnetic piece and the second magnetic piece are in butt joint, the signal acquisition unit acquires a first signal of the first magnetic resistance sensing unit through the first interface, the signal acquisition unit acquires a second signal of the second magnetic resistance sensing unit through the second interface, the signal acquisition unit acquires a third signal of the first coil through the third interface, the first signal and the second signal are differential mode signals, and the third signal is an electromagnetic signal generated when current in the cable to be tested passes through.
The electric signal acquisition component can be applied to metering of a 48V direct current system of a communication base station. When smaller current is acquired, the influence of an external magnetic field (such as a geomagnetic field, a magnetic field generated by transformation equipment around a communication base station and the like) on the accuracy of an acquisition result is considered, and the acquisition result is higher in accuracy under the condition that the base station equipment processes a dormant state at night and the current is smaller.
Specifically, the first magnetic piece and the second magnetic piece are designed to be arc-shaped, so that the first magnetic piece and the second magnetic piece form an annular structure after being in butt joint, and the first magnetic piece and the second magnetic piece encircle the periphery of the cable to be tested. When the current in the cable to be tested passes through, a magnetic field is generated, and the first magnetic piece and the second magnetic piece can play a role in gathering magnetism in the magnetic field generated by the current in the cable to be tested so as to improve the accuracy of current collection. And a first magnetic resistance sensing unit is arranged at a first butt joint position of the first magnetic element and the second magnetic element, a second magnetic resistance sensing unit is arranged at a second butt joint position of the first magnetic element and the second magnetic element, and a differential mode magnetic field is formed on the two magnetic resistance sensing units by a magnetic field generated by current in the cable to be tested so as to inhibit a common mode magnetic field generated by an external interference signal. The signal acquisition unit acquires a first signal output by the first magnetic resistance sensing unit through the first interface, the signal acquisition unit acquires a second signal output by the second magnetic resistance sensing unit through the second interface, namely the acquired first signal and second signal are differential mode signals, the differential mode signals can be extracted by differencing the first signal and the second signal, and the current of the cable to be tested is calculated according to the differential mode signals and the third signal. Common mode signals are restrained, and interference of external magnetic fields is reduced, so that errors of collected current signals are reduced, and accuracy of current collection is improved.
In this embodiment, adopt with the mode of first magnetic part and second magnetic part butt joint encircle the cable that awaits measuring, first magnetic part and second magnetic part can play the magnetic focusing effect to the magnetic field that the current produced in the cable that awaits measuring to set up first magnetic resistance sensing unit and second magnetic resistance sensing unit in the butt joint department of first magnetic part and second magnetic part, adopt two magnetic resistance sensing units, reduce the measuring error that the cable that awaits measuring when measuring eccentric leads to, simultaneously, two magnetic resistance sensing units can offset the influence of interfering magnetic field each other, promoted the accuracy of current collection.
The first magnetic resistance sensing unit and the second magnetic resistance sensing unit are symmetrically arranged to further reduce measurement errors caused by eccentricity of the cable to be measured during measurement, so that the first magnetic resistance sensing unit and the second magnetic resistance sensing unit can better offset the influence of an interference magnetic field, and accuracy of current collection is improved.
The first magnetic resistance sensing unit and the second magnetic resistance sensing unit are the same, and both the first magnetic resistance sensing unit and the second magnetic resistance sensing unit comprise tunnel magneto-resistance sensors. The tunnel magnetoresistance (Tunnel Magneto Resistance, TMR) sensor has the advantages of high precision, high sensitivity, low power consumption, small size, good temperature stability, wide working temperature range and the like. The magnetic field produced by the current in the cable under test can cause a change in the resistance of the TMR sensor. The signal acquisition unit acquires a first signal output by the first magnetic resistance sensing unit through the first interface, acquires a second signal output by the second magnetic resistance sensing unit through the second interface, and extracts a differential mode signal by differencing the first signal and the second signal, thereby inhibiting a common mode signal.
Optionally, the sensor further comprises a sensitivity adjusting unit, wherein the second magnetic piece is wound with a second coil, the sensitivity adjusting unit comprises a fourth interface, a fifth interface and a sixth interface, the fourth interface is electrically connected with the first magnetic resistance sensing unit, the fifth interface is electrically connected with the second magnetic resistance sensing unit, and the sixth interface is electrically connected with the second coil;
before the first magnetic piece and the second magnetic piece are in butt joint, the sensitivity adjusting unit provides preset alternating current excitation for the second coil through the sixth interface, outputs first power supply voltage to the first magnetic resistance sensing unit through the fourth interface, and outputs second power supply voltage to the second magnetic resistance sensing unit through the fifth interface, so that the sensitivities of the first magnetic resistance sensing unit and the second magnetic resistance sensing unit are the same.
In this example, as shown in fig. 3, two ends of a first coil (i.e., a feedback coil) surrounding the first magnetic element are connected to a closed-loop signal conditioning circuit, where the closed-loop signal conditioning circuit includes a signal acquisition unit; the logic circuit is connected around two ends of the second coil (i.e. the exciting coil) arranged on the second magnetic element, and the logic circuit comprises a sensitivity adjusting unit. Before the first magnetic part and the second magnetic part are in butt joint, namely before current collection is carried out on the cable to be tested, a default power supply voltage is respectively provided for the first magnetic resistance sensing unit and the second magnetic resistance sensing unit based on corresponding interfaces on the sensitivity adjusting unit in the logic circuit; and provides a preset alternating current excitation with specific amplitude and specific frequency for the second coil through a sixth interface on the sensitivity adjusting unit; then, collecting signals output by the first magnetic resistance sensing unit and the second magnetic resistance sensing unit based on preset alternating current excitation, and separating the alternating current quantity of the specific frequency by the sensitivity adjusting unit according to the signals output by the first magnetic resistance sensing unit and the second magnetic resistance sensing unit based on the preset alternating current excitation so as to calculate the current sensitivity of the first magnetic resistance sensing unit and the second magnetic resistance sensing unit; and then comparing the current sensitivities of the first magnetic resistance sensing unit and the second magnetic resistance sensing unit, outputting a first power supply voltage (Vcc 1) to the first magnetic resistance sensing unit through a fourth interface, and outputting a second power supply voltage (Vcc 2) to the second magnetic resistance sensing unit through a fifth interface so that the sensitivity directions of the first magnetic resistance sensing unit and the second magnetic resistance sensing unit are the same. Therefore, the sensitivity of the first magnetic resistance sensing unit is adjusted to be consistent with that of the second magnetic resistance sensing unit, and the problem of high acquisition result discreteness when the sensitivities of the magnetic resistance sensing units are different is solved. The first magnetic resistance sensing unit and the second magnetic resistance sensing unit can better offset the influence of the interference magnetic field, so that the accuracy of current collection is improved.
Optionally, the signal acquisition unit further comprises a low-pass filter, and the low-pass filter is used for filtering the alternating current excitation signal generated by the second coil.
In this example, as shown in fig. 4, the signal acquisition unit includes a differential amplifier, a low-pass filter, an integrating amplifier, and a current sampler. The differential amplifier, the low-pass filter and the integral amplifier are sequentially connected, one end of the first coil is electrically connected with the integral amplifier, and the other end of the first coil is electrically connected with the current sampler. The alternating current excitation signal generated by the second coil is filtered through the low-pass filter, so that the influence of the alternating current excitation signal generated after the second coil is arranged, namely a high-frequency signal, on the acquisition result of the first coil is reduced, and the accuracy of current acquisition is improved.
As shown in fig. 5, a first groove is formed in the second magnetic member at the first butt joint position, and the first magnetic resistance sensing unit is disposed in the first groove, so as to enhance the fixing effect of the first magnetic resistance sensing unit; and a second groove is formed in the second butt joint part, and the second magnetic resistance sensing unit is arranged in the second groove so as to enhance the fixing effect of the second magnetic resistance sensing unit. The magnetic resistance sensing unit is reduced to slip from the butt joint position of the first magnetic piece and the second magnetic piece, and accuracy of current collection is improved.
Optionally, the signal acquisition device further comprises a housing, the housing comprises a first housing and a second housing, the first housing and the second housing are detachably connected, the first housing is provided with a first accommodating cavity for accommodating the first magnetic piece, the second housing is provided with a second accommodating cavity for accommodating the second magnetic piece, the second accommodating cavity is further provided with a first magnetic resistance sensing unit and a second magnetic resistance sensing unit, the first magnetic resistance sensing unit and the second magnetic resistance sensing unit are close to the first accommodating cavity, the second housing is further provided with a third accommodating cavity, and the third accommodating cavity is used for accommodating the signal acquisition unit.
In this example, as shown in fig. 6, a first magnetic member and a first coil circumferentially provided on the first magnetic member are placed in a first accommodation chamber of a first housing; placing a second magnetic piece, a second coil circumferentially arranged on the second magnetic piece, and a first magnetic resistance sensing unit and a second magnetic resistance sensing unit arranged on the second magnetic piece in a second accommodating cavity of a second shell; the signal acquisition unit and the sensitivity adjustment unit are placed in the third accommodating cavity of the second shell, and the stability of connection between the structures is enhanced through the fixing effect of the shell. The shell is made of insulating materials, so that measurement errors caused by electric leakage are avoided. The first magnetic resistance sensing unit and the second magnetic resistance sensing unit are close to the first accommodating cavity, and are beneficial to collecting signals output by the first magnetic resistance sensing unit and the second magnetic resistance sensing unit.
The hinge structure is arranged at a first connection position of the first shell and the second shell, and the buckle structure is arranged at a second connection position of the first shell and the second shell.
In this way, the buckle structure is separated, so that the first shell body is opened for a certain angle around the hinge structure and the second shell body, and the cable to be tested is placed conveniently; after the cable to be tested is placed in a cable channel formed by butting the first shell and the second shell, the buckling structure is clamped, and the first magnetic piece and the second magnetic piece are arranged around the periphery of the cable to be tested. The use of the electric signal acquisition component is facilitated. The signal acquisition unit acquires a first signal of the first magnetic resistance sensing unit through the first interface, the signal acquisition unit acquires a second signal of the second magnetic resistance sensing unit through the second interface, the signal acquisition unit acquires a third signal of the first coil through the third interface, a differential mode signal can be extracted by differentiating the first signal and the second signal, and the current of the cable to be tested is calculated according to the differential mode signal and the third signal. Common mode signals are restrained, and interference of external magnetic fields is reduced, so that errors of collected current signals are reduced, and accuracy of current collection is improved.
Referring to fig. 7, fig. 7 is a flow chart of a current detection method according to an embodiment of the present invention, which is applied to the above-mentioned electrical signal acquisition assembly, and the method includes the following steps:
701, arranging the first magnetic piece and the second magnetic piece on the periphery of a cable to be tested, and butting the first magnetic piece and the second magnetic piece;
the first magnetic piece and the second magnetic piece are designed to be arc-shaped, so that the first magnetic piece and the second magnetic piece form an annular structure after being butted to encircle the periphery of the cable to be tested. When the current in the cable to be tested passes through, a magnetic field is generated, and the first magnetic piece and the second magnetic piece can play a role in gathering magnetism in the magnetic field generated by the current in the cable to be tested so as to improve the accuracy of current collection.
Step 702, acquiring the first signal of the first magnetic resistance sensing unit acquired by the signal acquisition unit through the first interface, the second signal of the second magnetic resistance sensing unit acquired by the signal acquisition unit through the second interface, and the third signal of the first coil acquired by the signal acquisition unit through the third interface;
the first magnetic resistance sensing unit is arranged at the first butt joint of the first magnetic member and the second magnetic member, the second magnetic resistance sensing unit is arranged at the second butt joint of the first magnetic member and the second magnetic member, and a differential mode magnetic field is formed on the two magnetic resistance sensing units by a magnetic field generated by current in the cable to be tested so as to inhibit a common mode magnetic field generated by an external interference signal. The signal acquisition unit acquires a first signal output by the first magnetic resistance sensing unit through the first interface, and acquires a second signal output by the second magnetic resistance sensing unit through the second interface, namely the acquired first signal and second signal are differential mode signals.
Step 703, determining the current of the cable to be tested according to the third signal after the first signal and the second signal are differenced.
According to the first signal and the second signal acquired in the steps, the differential mode signal can be extracted by differencing the first signal and the second signal, and then the current of the cable to be tested is calculated according to the differential mode signal and the third signal. Common mode signals are restrained, and interference of external magnetic fields is reduced, so that errors of collected current signals are reduced, and accuracy of current collection is improved.
In this embodiment, adopt with the mode of first magnetic part and second magnetic part butt joint encircle the cable that awaits measuring, first magnetic part and second magnetic part can play the magnetic focusing effect to the magnetic field that the current produced in the cable that awaits measuring to set up first magnetic resistance sensing unit and second magnetic resistance sensing unit in the butt joint department of first magnetic part and second magnetic part, adopt two magnetic resistance sensing units, reduce the measuring error that the cable that awaits measuring when measuring eccentric leads to, simultaneously, two magnetic resistance sensing units can offset the influence of interfering magnetic field each other, promoted the accuracy of current collection.
Wherein, before step 701, further comprises: providing a default power supply voltage for the first magnetic resistance sensing unit and the second magnetic resistance sensing unit respectively based on corresponding interfaces on the sensitivity adjusting unit in the logic circuit; and provides a preset alternating current excitation with specific amplitude and specific frequency for the second coil through a sixth interface on the sensitivity adjusting unit; then, collecting signals output by the first magnetic resistance sensing unit and the second magnetic resistance sensing unit based on preset alternating current excitation, and separating the alternating current quantity of the specific frequency by the sensitivity adjusting unit according to the signals output by the first magnetic resistance sensing unit and the second magnetic resistance sensing unit based on the preset alternating current excitation so as to calculate the current sensitivity of the first magnetic resistance sensing unit and the second magnetic resistance sensing unit; and then comparing the current sensitivities of the first magnetic resistance sensing unit and the second magnetic resistance sensing unit, outputting a first power supply voltage (Vcc 1) to the first magnetic resistance sensing unit through a fourth interface, and outputting a second power supply voltage (Vcc 2) to the second magnetic resistance sensing unit through a fifth interface, so that the sensitivities of the first magnetic resistance sensing unit and the second magnetic resistance sensing unit are the same.
Therefore, the sensitivity of the first magnetic resistance sensing unit is adjusted to be consistent with that of the second magnetic resistance sensing unit, and the problem of high acquisition result discreteness when the sensitivities of the magnetic resistance sensing units are different is solved. The first magnetic resistance sensing unit and the second magnetic resistance sensing unit can better offset the influence of the interference magnetic field, so that the accuracy of current collection is improved.
The embodiment of the invention also provides an electric energy meter, which comprises the electric signal acquisition assembly.
It should be noted that, the implementation manner of the embodiment of the electrical signal acquisition assembly is also suitable for the embodiment of the electric energy meter, and the same technical effects can be achieved, which is not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present invention is not limited to performing the functions in the order discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (9)
1. An electrical signal acquisition assembly, comprising:
the first magnetic piece and the second magnetic piece are arc-shaped magnetic pieces, the first magnetic piece and the second magnetic piece can be in butt joint, and a first coil is wound on the first magnetic piece;
the first magnetic resistance sensing unit and the second magnetic resistance sensing unit are respectively arranged at a first butt joint position and a second butt joint position of the first magnetic piece and the second magnetic piece;
the signal acquisition unit comprises a first interface, a second interface and a third interface, wherein the first interface is electrically connected with the first magnetic resistance sensing unit, the second interface is electrically connected with the second magnetic resistance sensing unit, and the third interface is electrically connected with the first coil;
when the first magnetic piece and the second magnetic piece are arranged on the periphery of the cable to be tested and the first magnetic piece and the second magnetic piece are in butt joint, the signal acquisition unit acquires a first signal of the first magnetic resistance sensing unit through the first interface, the signal acquisition unit acquires a second signal of the second magnetic resistance sensing unit through the second interface, the signal acquisition unit acquires a third signal of the first coil through the third interface, the first signal and the second signal are differential mode signals, and the third signal is an electromagnetic signal generated when current in the cable to be tested passes through;
the electric signal acquisition assembly further comprises a sensitivity adjustment unit, the second magnetic piece is wound with a second coil, the sensitivity adjustment unit comprises a fourth interface, a fifth interface and a sixth interface, the fourth interface is electrically connected with the first magnetic resistance sensing unit, the fifth interface is electrically connected with the second magnetic resistance sensing unit, and the sixth interface is electrically connected with the second coil;
before the first magnetic piece and the second magnetic piece are in butt joint, the sensitivity adjusting unit provides preset alternating current excitation for the second coil through the sixth interface, outputs first power supply voltage to the first magnetic resistance sensing unit through the fourth interface, and outputs second power supply voltage to the second magnetic resistance sensing unit through the fifth interface, so that the sensitivities of the first magnetic resistance sensing unit and the second magnetic resistance sensing unit are the same.
2. The electrical signal acquisition assembly of claim 1, further comprising a low pass filter in the signal acquisition unit for filtering the ac excitation signal generated by the second coil.
3. The electrical signal acquisition assembly of claim 1, wherein at the first interface, a first recess is formed in the second magnetic member, and the first magnetoresistive sensing unit is disposed in the first recess;
and a second groove is formed in the second magnetic part at the second butt joint position, and the second magnetic resistance sensing unit is arranged in the second groove.
4. The electrical signal acquisition assembly of claim 1, further comprising a housing comprising a first housing and a second housing, the first housing and the second housing being detachably connected, the first housing being provided with a first receiving cavity for receiving the first magnetic member, the second housing being provided with a second receiving cavity for receiving the second magnetic member, the second receiving cavity being further provided therein with the first magnetoresistive sensing unit and the second magnetoresistive sensing unit, and the first magnetoresistive sensing unit and the second magnetoresistive sensing unit being proximate to the first receiving cavity, the second housing being further provided with a third receiving cavity for receiving the signal acquisition unit.
5. The electrical signal acquisition assembly of claim 4, wherein a hinge structure is provided at a first connection location of the first housing and the second housing, and a snap structure is provided at a second connection location of the first housing and the second housing.
6. The electrical signal acquisition assembly of claim 1, wherein the first and second magneto-resistive sensing units are symmetrically disposed.
7. The electrical signal acquisition assembly of claim 1, wherein the first and second magneto-resistive sensing units are identical, each comprising a tunneling magneto-resistive sensor.
8. A current detection method applied to the electrical signal acquisition assembly of any one of claims 1 to 7, characterized in that the method comprises:
arranging the first magnetic piece and the second magnetic piece on the periphery of the cable to be tested, and butting the first magnetic piece and the second magnetic piece;
acquiring the first signal of the first magnetic resistance sensing unit acquired by the signal acquisition unit through the first interface, the second signal of the second magnetic resistance sensing unit acquired by the signal acquisition unit through the second interface, and the third signal of the first coil acquired by the signal acquisition unit through the third interface;
and determining the current of the cable to be tested according to the third signal after the first signal and the second signal are subjected to difference.
9. An electric energy meter comprising an electrical signal acquisition assembly according to any one of claims 1 to 7.
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| JP2015125019A (en) * | 2013-12-25 | 2015-07-06 | 株式会社東芝 | Current sensor, current measuring module, and smart meter |
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