CN113341201B - Fluxgate current sensor and current measuring method - Google Patents
Fluxgate current sensor and current measuring method Download PDFInfo
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- CN113341201B CN113341201B CN202110637689.9A CN202110637689A CN113341201B CN 113341201 B CN113341201 B CN 113341201B CN 202110637689 A CN202110637689 A CN 202110637689A CN 113341201 B CN113341201 B CN 113341201B
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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
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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Abstract
The invention provides a fluxgate current sensor and a current measurement method, the fluxgate current sensor comprising: an auxiliary magnetic core and at least two closed-loop magnetic circuits; the closed-loop magnetic circuits are symmetrically coupled; the auxiliary magnetic core is arranged at the coupling joint of the closed-loop magnetic circuit. The fluxgate current sensor provided by the invention has a symmetrically coupled closed-loop magnetic circuit, can provide a symmetrically measured magnetic field environment, reduces the influence of higher harmonics caused by the position of an eccentric conductor, reduces production errors among different sensors, and improves the measurement precision.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a fluxgate current sensor and a current measurement method.
Background
The current sensor based on the fluxgate principle is a magnetic field sensing device having a function of receiving an external magnetic field, an auxiliary driving magnetic field generated by an alternating current, and a compensation magnetic field generated by a feedback current, and is capable of generating an excitation signal for obtaining information of the external magnetic field. The positive and negative directions are symmetrical when the excitation signal is driven by the auxiliary alternating current only. The asymmetry degree of the excitation signal under the action of the external magnetic field is related to the amplitude and the direction of the external magnetic field, and vector information of the external magnetic field is fed back and read after the asymmetry degree is eliminated by means of the compensation magnetic field. The alternating auxiliary current and the feedback current are both generated by an electronic circuit, and the excitation signal is processed by the electronic circuit. The external magnetic field is generated by the current to be measured, and the compensation magnetic field is generated by the feedback current. The magnitude of the feedback current and the current to be measured are in a proportional relation related to the number of turns of the winding of the turn number of the feedback winding, and the information of the current to be measured can be indirectly represented by using a precision resistor.
Some known fluxgate current sensors have a magnetic field detection device surrounding a current conductor to be measured, and for a structure in which a ring shape or other closed or almost closed shapes surround the current conductor to be measured, the magnetic induction intensity of a magnetic material close to the conductor side and the magnetic induction intensity of a magnetic material far away from the conductor side are not uniformly distributed due to the position difference and eccentricity of the conductor, so that the measurement accuracy of the sensor is affected.
In particular, small currents produce magnetic fields that are weak and susceptible to external magnetic fields. Current sensors applied to detect small currents or small differential currents are generally less accurate.
Accordingly, there is a continuing need for a fluxgate current sensor that reduces or eliminates the effects of conductor position eccentricity.
Disclosure of Invention
In view of the above problems, the present invention provides a fluxgate current sensor comprising: an auxiliary magnetic core and at least two closed-loop magnetic circuits;
the closed-loop magnetic circuits are symmetrically coupled;
the auxiliary magnetic core is arranged at the coupling joint of the closed-loop magnetic circuit.
Further, the fluxgate current sensor further comprises a housing,
the closed-loop magnetic circuit is arranged in the shell;
the shell is provided with a group of limiting holes corresponding to each closed magnetic circuit respectively, and the number of each group of limiting holes is one or more;
the aperture of the limiting hole is smaller than that of the corresponding closed-loop magnetic circuit.
Further, the fluxgate current sensor further comprises an auxiliary coil and a winding carrier,
the winding carrier clamps the auxiliary magnetic core;
the auxiliary coil is wound around the winding carrier to form an auxiliary loop.
Further, the fluxgate current sensor further includes: a magnetic field induction device and a feedback loop,
the magnetic field induction device comprises a sealed shell;
the sealing shell comprises a coupling connection part;
the auxiliary loop is arranged inside the coupling connection part;
the feedback loop is arranged outside the coupling connection.
Further, the seal shell is double annular;
the magnetic field induction device comprises two closed-loop magnetic circuits which are respectively arranged in a double ring of the sealing shell.
Furthermore, a plurality of protruding parts are arranged on the long edge of the winding carrier and used for being clamped into corresponding concave parts on the sealing shell after the auxiliary coil is wound.
Further, the seal housing includes a seal groove portion and a seal cap portion that cooperate to form a double annular seal housing.
Further, the fluxgate current sensor includes: a magnetic field induction device and a signal conditioning circuit,
the shell comprises a covering part and a supporting coating part, the supporting coating part is used for accommodating the magnetic field sensing device and the signal conditioning circuit, and the covering part is adapted to the supporting coating part and is used for covering the supporting coating part;
the support coating part is internally provided with a limiting hole wall part, and the covering part is provided with a limiting hole edge part; the wall part of the limiting hole is matched with the edge part of the limiting hole, and a complete limiting hole is formed when the covering part is buckled with the supporting and coating part.
Further, the supporting cladding part comprises a first cladding part and a second cladding part, and the first cladding part is communicated with the second cladding part to form a T-shaped accommodating space;
the first coating part is positioned above the second coating part, has a length larger than that of the second coating part and is used for accommodating the magnetic field induction device;
the second cladding portion is for housing signal conditioning circuitry.
Further, the closed-loop magnetic circuit is made of flexible materials.
The invention also provides a current measuring method, which uses the fluxgate current sensor to measure the conductor current.
Further, when the number of each group of limiting holes is multiple, the method comprises the following steps:
and a plurality of leads respectively penetrate through the limiting holes of one group of limiting holes and penetrate out of the symmetrical limiting holes in the other group of limiting holes.
Further, when the number of each group of limiting holes is multiple, the method comprises the following steps:
and a conducting wire passes through the plurality of limiting holes and the closed-loop magnetic circuit for multiple times, and the auxiliary magnetic core is surrounded by multiple circles.
The fluxgate current sensor provided by the invention has a symmetrically coupled closed-loop magnetic circuit, can provide a symmetrically measured magnetic field environment, reduces the influence of higher harmonics caused by the position of an eccentric conductor, reduces production errors among different sensors, and improves the measurement precision.
The limiting hole is convenient for accurately controlling the position of the conductor during measurement, and the operation process is optimized. And can realize simultaneous measurement of a plurality of conductors and superposition measurement of multiple winding of the conductors.
The fluxgate current sensor of the present invention has a simple structure and is convenient to produce.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 illustrates a schematic perspective view of a fluxgate current sensor according to an embodiment of the present invention;
FIG. 2 shows an exploded view of a fluxgate current sensor according to an embodiment of the present invention;
FIG. 3 illustrates an exploded view of the magnetic field sensing portion of the fluxgate current sensor according to an embodiment of the present invention;
FIG. 4 illustrates a top perspective view of a fluxgate current sensor according to an embodiment of the present invention;
FIG. 5 is a schematic top view of a fluxgate current sensor comprising four closed-loop magnetic circuits according to an embodiment of the present invention;
FIG. 6 is a schematic top view of a fluxgate current sensor comprising three closed-loop magnetic circuits according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a configuration for measuring a plurality of wires according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a conducting wire passing through a closed-loop magnetic circuit multiple times according to an embodiment of the present invention.
Reference numerals:
a housing 1; a limiting hole 11; a cover 12; a stopper hole edge portion 121; a support coating 13; a stopper hole wall portion 131; the first cladding portion 132; the second coating portion 133; a fixing pin 14; a magnetic field induction device 2; an auxiliary magnetic core 21; a winding carrier 22; a boss portion 221; a closed-loop magnetic circuit 23; a sealed shell 24; a recessed portion 241; a seal groove portion 242; a sealing cap 243; the coupling connection 244; a signal conditioning circuit 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a fluxgate current sensor (abbreviated as a current sensor), as shown in fig. 1, the current sensor includes a housing 1. The housing 1 is internally provided with a magnetic field induction device 2 and a signal conditioning circuit 3.
The magnetic field sensing device 2 comprises an auxiliary magnetic core, an auxiliary loop, a closed-loop magnetic circuit and a feedback loop, and is used for forming an induction magnetic field and collecting electromagnetic induction signals of a conductor to be detected. The signal conditioning circuit 3 comprises an integrator, a comparator and other electronic circuits for processing signals, and is used for detecting the zero magnetic flux state of the auxiliary magnetic core in an integral or differential mode and reflecting the magnetic field generated by the conductor to be measured after the zero magnetic flux state is counteracted by a feedback loop so as to realize the real-time accurate measurement of the current flowing through the conductor to be measured. Without loss of generality, the signal conditioning circuitry is disposed on a printed circuit board.
The shell 1 is used for coating the magnetic field induction device 2 and the signal conditioning circuit 3, providing a limiting hole 11 for one or more conductors to pass through, wherein the limiting hole 11 is adapted to a closed-loop magnetic circuit of the magnetic field induction device 2, and the conductors are limited at the position of the limiting hole 11 when passing through the closed-loop magnetic circuit during measurement. The position-limiting hole 11 overlaps with the loop of the closed-loop magnetic circuit, and the conductor passing through the position-limiting hole 11 also passes through the loop of the closed-loop magnetic circuit, wherein the loop is a closed loop or an almost closed loop (not closed but encircling more than a certain proportion, such as 3/4).
In the embodiment of the present invention, a closed-loop magnetic circuit corresponds to a set of position-limiting holes 11, and the set of position-limiting holes 11 includes one or more position-limiting holes 11 for detecting a current flowing through a conductor to be tested (not shown) passing through the position-limiting holes 11 or a vector sum of currents flowing through a plurality of conductors to be tested (not shown). Without loss of generality, the embodiment of the invention comprises two sets of 4 limiting holes 11 corresponding to two closed-loop magnetic circuits. The shape of the stopper hole 11 is not limited to a circle, a rectangle, a polygon, an irregular shape, and the like. The shell limits the relative position between the conductor to be measured and the magnetic field induction device 2 through the limiting hole 11 to counteract the interference of higher harmonics caused by eccentric conductors.
The structure of the housing 1 of the current sensor is further described below with reference to fig. 2. As shown in fig. 2, the housing 1 includes a cover 12 and a supporting cover 13, the supporting cover 13 is used for accommodating the magnetic field sensing device 2 and the signal conditioning circuit 3, and the cover 12 is adapted to the supporting cover 13 and is used for covering the supporting cover 13.
The support coating portion 13 is provided therein with a stopper hole wall portion 131, and the covering portion 12 is provided with a stopper hole edge portion 121. The limiting hole wall parts 131 are matched with the limiting hole edge parts 121 in the same number, matched in shape and corresponding in position, and form a complete limiting hole 11 when the covering part 12 is buckled with the support coating part 13. The limiting hole wall portion 131 is a hollow cylinder with an upper opening and a lower opening.
In the embodiment of the present invention, the supporting cover 13 includes a first cover 132 and a second cover 133, and the first cover 132 is communicated with the second cover 133 to form a T-shaped receiving space. The first coating portion 132 is located above the second coating portion 133, and has a length greater than that of the second coating portion 133, for accommodating the magnetic field induction device 2. The second cover 133 is used to house the signal conditioning circuit 3. Without loss of generality, the first wrapping portion and the second wrapping portion are both rectangular parallelepiped in shape.
The outer side of the shell 1 is also provided with a fixed pin 14 and a pin hole, the fixed pin 14 is connected with the signal conditioning circuit 3 and penetrates through the pin hole to be used for transmitting the signal conditioning circuit 3 and an external signal. The positions of the fixing pins 14 and the pin holes may be set on the top, bottom, side, etc. of the current sensor, so as to be fixed with external connections. Without loss of generality, the fixing pins 14 are disposed at the bottom of the supporting coating portion 13, specifically, at four corners of the bottom wall of the first coating portion 13. The signal conditioning circuit 3 can be connected to the magnetic field sensing device 2 via terminals and can transmit signals to the outside via fixed pins or direct wires extending from the top, bottom or sides of the current sensor.
The structure of the magnetic field sensing device 2 according to the embodiment of the present invention will be described with reference to fig. 3. The magnetic field sensing device 2 comprises an auxiliary magnetic core, an auxiliary loop, a closed-loop magnetic circuit and a feedback loop (not shown). The auxiliary loop includes an auxiliary coil (not shown). The feedback loop includes a feedback coil (not shown). Fig. 3 shows the sealed housing 24, the closed-loop magnetic circuit 23, the auxiliary magnetic core 21, the winding carrier 22 in the magnetic field sensing device. In the embodiment of the invention, the magnetic field sensing device 2 at least comprises two closed-loop magnetic circuits 23, the two closed-loop magnetic circuits 23 are symmetrically coupled, and the coupling joint is provided with the auxiliary magnetic core 21, so that a stronger and stronger magnetic field can be uniformly converged, the testing precision and stability of the current sensor are improved, and the consistency of different sensors is ensured. The magnetic field sensing device 2 offsets the magnetic field generated by the conductor to be measured in real time through the feedback loop, indirectly reflects the current information of the conductor to be measured, and is matched with the signal conditioning circuit to sense the current information of the conductor to be measured in a non-contact mode.
In the embodiment of the present invention, the two closed-loop magnetic circuits 23 are rectangular with a chamfer angle, and are conveniently placed in the first wrapping portion 132 after being placed in the sealed shell 24, so as to fully utilize the space. In other embodiments, the magnetic circuit may have any shape, and the plurality of (two or more) closed-loop magnetic circuits may be symmetrically coupled from any angle, and the auxiliary magnetic core 21 is disposed at the coupling joint. Fig. 3 shows that the two closed-loop magnetic circuits 23 are coupled in the same plane, i.e. 180 degrees, but in other embodiments, they may be coupled at other angles, e.g. 90 degrees, which may reduce the length or volume of the current sensor. The two closed-loop magnetic circuits 23 coupled at 90 degrees are in a solid coupling relationship, and are still left-right symmetric with respect to the auxiliary magnetic core 21.
The auxiliary magnetic core 21 is a long strip, and may be a closed loop or open loop iron core, and is not limited to one or more of the cores used at the same time. For example, when the auxiliary core 21 has a ring shape, the ring surface is perpendicular to the plane of the current closed-loop magnetic circuit, and the closed-loop magnetic circuits are disposed on both sides of the ring surface of the auxiliary core 21. When the magnetic field sensing device 2 is assembled, the auxiliary magnetic core 21 is clamped by using two winding carriers 22, the winding carriers 22 are long strips longer (slightly longer) than the auxiliary magnetic core 21, and a plurality of protrusions 221 are arranged on the long edges of the winding carriers 22, and are used for being clamped into corresponding recesses 241 on the sealing shell 24 after the auxiliary coil is wound, so as to play a role in fixing. The auxiliary coil is wound on the winding carrier 22 holding the auxiliary core 21 to form an auxiliary loop (the auxiliary loop is a component of the magnetic field induction device, and is not limited to passing current or not). According to the embodiment of the invention, the anti-interference capability of the current sensor is improved by using the winding carrier 22 to clamp the structure of the winding behind the auxiliary magnetic core 21, the feedback loop winding is coated outside the auxiliary loop, and the anti-interference capability and the sensitivity of the current sensor are further improved by using the layer-by-layer coated structure.
The seal housing 24 includes a seal groove portion 242 and a seal cap portion 243 that cooperate to form the double annular seal housing 24. In the middle of the double ring is a coupling connection portion 244, and accordingly, the coupling connection portion 244 includes two portions disposed at the sealing groove portion 242 and the sealing cap portion 243. The auxiliary loop and the auxiliary core 21 are disposed inside the coupling connection part 244, i.e., in the middle groove of the sealing groove part 242. The feedback loop is disposed outside the coupling connection portion 244, i.e., wound outside the coupling connection portion 244 after the sealing case 24 is snapped.
The magnetic field induction device 2 comprises two closed-loop magnetic circuits 23, each arranged in a double loop of the containment vessel. The closed-loop magnetic circuit 23 can be formed by stacking laminated sheets or pressing magnetic core powder, and the closed-loop magnetic circuit 23 can also be made of flexible materials, so that the current detection can be conveniently carried out by penetrating through conductors from a proper angle, the closed-loop magnetic circuit is suitable for different storage spaces, and the portability is improved. Closed-loop magnetic circuit 23 is illustratively fabricated using a flexible magnet, such as a flexible neodymium-iron-boron magnet.
Fig. 4 shows a top perspective view of a fluxgate current sensor according to an embodiment of the present invention. The two closed magnetic circuits 23 are symmetrically arranged with respect to the auxiliary core 21, the auxiliary loop and the feedback loop. Two sets of limiting holes 11 are also symmetrically arranged relative to the auxiliary magnetic core 21, the limiting holes 11 are nested in the annular inner part of the closed magnetic circuit 23, and the aperture of the limiting holes 11 is smaller than that of the closed magnetic circuit 23. The limiting hole 11 plays a limiting role, and precision errors or measurement difficulty caused by the distance and position difference between the conductor to be measured and the sensor are avoided. Therefore, the aperture of the position limiting hole 11 is significantly smaller than that of the closed magnetic circuit 23, that is, the aperture of the position limiting hole 11 is not only used to satisfy that the closed magnetic circuit 23 is accommodated in the housing 1, but is used to form a positioning constraint for the conductor to be measured.
The current sensor also comprises a shielding cover so as to improve the accuracy and the anti-interference capability of the current sensor. The shield can completely or partially encase the magnetic field sensing device and can be made of any magnetically permeable material. The shielding cover can be arranged on the inner side or the outer side of the sealing shell or on the inner side and the outer side.
In another embodiment, the current sensor may also adopt four closed-loop magnetic circuits 23, such as extending the auxiliary core 21 and providing two closed-loop magnetic circuits 23 on two sides of the auxiliary core 21, as shown in fig. 5. Each closed-loop magnetic circuit 23 and corresponding limiting hole 11 are identical or similar in structure to those described above. More closed-loop magnetic circuits may be included on this basis.
In another embodiment, the current sensor may also include three closed-loop magnetic circuits 23, where the three closed-loop magnetic circuits 23 are disposed around the auxiliary magnetic core 21, and the angle between every two closed-loop magnetic circuits 23 is 120 degrees, as shown in fig. 6. The housing 1 and the limiting hole 11 are correspondingly arranged in the annular position of each closed-loop magnetic circuit. The schematic top view of the current sensor with three closed-loop magnetic circuits 23 is shown. More closed-loop magnetic circuits may be included on this basis.
When the current sensor of the embodiment of the invention is used for measuring current, a conductor can penetrate into one closed-loop magnetic circuit 23 and penetrate out of the other closed-loop magnetic circuit 23, so that the conductor surrounds magnetic induction core components such as the auxiliary magnetic core 21, the auxiliary loop, the feedback loop and the like. Therefore, the current sensor of the embodiment of the invention has the following advantages: the influence of higher harmonics caused by the position of an eccentric conductor is reduced through a symmetrical design structure and a surrounding measurement mode; the sensitivity and the anti-interference capability of the sensor are improved; reducing production errors between different sensors. When producing different sensors, the influence in the symmetrical structure in this embodiment is small due to measurement accuracy errors caused by component size, process errors.
Further, when the current sensor includes two or more closed-loop magnetic circuits, in use, the current sensor is inserted into one closed-loop magnetic circuit 23, is inserted out of the other closed-loop magnetic circuit 23, and is inserted into each closed-loop magnetic circuit 23, and the conductive wire is wound around the core member such as the auxiliary magnetic core 21.
The current sensor for the structure of the plurality of limiting holes 11 can also be used for simultaneously measuring the current of a plurality of conductors, taking the structure of two closed-loop magnetic circuits 23 as an example, each conducting wire respectively penetrates through the limiting hole 11 corresponding to one closed-loop magnetic circuit 23 and penetrates out of the symmetrical limiting hole 11 corresponding to the other closed-loop magnetic circuit. As shown in fig. 7, the conducting wire a, the conducting wire B, the conducting wire C, and the conducting wire D respectively penetrate through one limiting hole of the first closed-loop magnetic circuit 23 and penetrate out of the corresponding symmetrical limiting hole 11 of the other closed-loop magnetic circuit 23.
Further, for the current sensor with a plurality of limiting holes 11, a wire to be measured is allowed to pass through the plurality of limiting holes 11 and pass through the closed-loop magnetic circuit for multiple times, and a plurality of circles of surrounding are formed for core components such as the auxiliary magnetic core 21, as shown in fig. 8. By passing through the closed-loop magnetic circuit 23 for multiple times, signal superposition can be realized, and particularly for the test of small current, the detection accuracy can be obviously improved.
The current sensor provided by the embodiment of the invention is provided with a plurality of closed-loop magnetic circuits and a plurality of limiting holes, can offset the measurement error caused by the position influence of the eccentric conductor, and has the advantages of high measurement sensitivity, strong anti-interference capability, simple structure, lower processing difficulty and lower cost.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A fluxgate current sensor comprising: an auxiliary magnetic core and at least two closed-loop magnetic circuits;
the closed-loop magnetic circuits are symmetrically coupled;
the auxiliary magnetic core is arranged at the coupling connection position of the closed-loop magnetic circuit;
the fluxgate current sensor further comprises a housing,
the closed-loop magnetic circuit is arranged in the shell;
the shell is provided with a group of limiting holes corresponding to each closed magnetic circuit respectively, and the number of each group of limiting holes is one or more;
the aperture of the limiting hole is smaller than that of the corresponding closed-loop magnetic circuit;
the fluxgate current sensor further comprises an auxiliary coil and a winding carrier,
the winding carrier clamps the auxiliary magnetic core;
the auxiliary coil is wound on the winding carrier to form an auxiliary loop;
the fluxgate current sensor further includes: a magnetic field induction device and a feedback loop,
the magnetic field induction device comprises a sealed shell;
the sealed housing includes a coupling connection;
the auxiliary loop is arranged inside the coupling connection part;
the feedback loop is arranged outside the coupling connection part;
the sealing shell is double-ring-shaped;
the magnetic field induction device comprises two closed-loop magnetic circuits which are respectively arranged in double rings of the sealed shell.
2. The fluxgate current sensor according to claim 1,
and a plurality of convex parts are arranged on the long edge of the winding carrier and are used for winding the auxiliary coil and then clamping the auxiliary coil into corresponding concave parts on the sealing shell.
3. The fluxgate current sensor according to claim 1, wherein the sealing case comprises a sealing groove portion and a sealing cover portion which cooperate to form a double annular sealing case.
4. A fluxgate current sensor according to any one of claims 1 to 3 comprising: a signal conditioning circuit for conditioning a signal to be transmitted,
the shell comprises a covering part and a supporting coating part, the supporting coating part is used for accommodating the magnetic field sensing device and the signal conditioning circuit, and the covering part is adapted to the supporting coating part and is used for covering the supporting coating part;
the support coating part is internally provided with a limiting hole wall part, and the covering part is provided with a limiting hole edge part; the wall part of the limiting hole is matched with the edge part of the limiting hole, and a complete limiting hole is formed when the covering part is buckled with the supporting and coating part.
5. The fluxgate current sensor according to claim 4,
the supporting coating part comprises a first coating part and a second coating part, and the first coating part is communicated with the second coating part to form a T-shaped accommodating space;
the first coating part is positioned above the second coating part, has a length larger than that of the second coating part and is used for accommodating the magnetic field induction device;
the second cladding portion is for housing signal conditioning circuitry.
6. A fluxgate current sensor according to any one of claims 1 to 3,
the closed-loop magnetic circuit is made of flexible materials.
7. A current measuring method, characterized in that a conductor current is measured using the fluxgate current sensor as claimed in any one of claims 1 to 6.
8. The current measuring method according to claim 7, wherein when the number of the limiting holes in each group is plural, the method comprises:
and a plurality of leads respectively penetrate through the limiting holes of one group of limiting holes and penetrate out of the symmetrical limiting holes in the other group of limiting holes.
9. The current measuring method according to claim 7, wherein when the number of the limiting holes in each group is plural, the method comprises:
and a conducting wire passes through the plurality of limiting holes and the closed-loop magnetic circuit for multiple times, and the auxiliary magnetic core is surrounded by multiple circles.
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