CN116539942A - Magnetic flux detection system and current sensor - Google Patents
Magnetic flux detection system and current sensor Download PDFInfo
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- CN116539942A CN116539942A CN202310820133.2A CN202310820133A CN116539942A CN 116539942 A CN116539942 A CN 116539942A CN 202310820133 A CN202310820133 A CN 202310820133A CN 116539942 A CN116539942 A CN 116539942A
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- 230000004907 flux Effects 0.000 title claims abstract description 118
- 238000001514 detection method Methods 0.000 title claims abstract description 50
- 230000035945 sensitivity Effects 0.000 claims description 13
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/205—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using magneto-resistance devices, e.g. field plates
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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
Abstract
The application discloses a magnetic flux detection system and a current sensor. The magnetic flux detection system comprises a magnetic core and a magnetic sensor. Wherein, the magnetic core is annular structure, is provided with the recess on the magnetic core in order to form two magnetic poles. When current is detected, leakage magnetic flux passes through the two magnetic poles and the groove. The leakage magnetic flux is a part of the magnetic flux generated on the magnetic core. The magnetic sensor is arranged on the outer surface of the magnetic core and is arranged at the position of the groove. The magnetic sensor is configured to detect a leakage magnetic flux and generate a detection voltage based on the leakage magnetic flux. By the above manner, the bandwidth of the measurement current of the current sensor can be increased.
Description
Technical Field
The present disclosure relates to the field of current detection technologies, and in particular, to a magnetic flux detection system and a current sensor.
Background
The closed loop current sensor is also called zero magnetic flux hall current sensor. Currently, common closed loop current sensors typically include a magnetic core and a hall element. In order to detect the current, the magnetic flux inside the core needs to be detected first. In this case, an air gap must be completely cut through the core to accommodate a hall element that detects the magnetic flux.
However, the air permeability of the air gap is very low (several thousandths of a conventional magnetic material), which causes a sharp drop in the equivalent permeability of the entire core, resulting in a smaller magnetic flux generated in the core. Eventually resulting in a smaller bandwidth of the measured current of the current sensor.
Disclosure of Invention
The application aims to provide a magnetic flux detection system and a current sensor, which can increase the bandwidth of a measurement current of the current sensor.
To achieve the above object, in a first aspect, the present application provides a magnetic flux detection system applied to a current sensor, the magnetic flux detection system including:
the magnetic core is of an annular structure, a groove is formed in the magnetic core to form two magnetic poles, and leakage magnetic flux passes through the two magnetic poles and the groove when current is detected, wherein the leakage magnetic flux is part of magnetic flux generated on the magnetic core;
the magnetic sensor is arranged on the outer surface of the magnetic core and at the position of the groove, and is used for detecting the leakage magnetic flux and generating detection voltage based on the leakage magnetic flux.
In an alternative, the width of the recess increases gradually along the depth of the recess on the edge of the core.
In an alternative, the grooves are in an inverted trapezoidal or scalloped configuration.
In an alternative, both poles are movable poles.
In an alternative manner, the magnetic sensor is parallel to the magnetic field generated by the leakage magnetic flux.
In an alternative way, the air gap of the recess at the outer surface of the magnetic core is larger than the width of the die in the magnetic sensor in the die sensitivity direction.
In an alternative, the air gap of the recess at the outer surface of the core is in the range of 0.1mm,0.5 mm.
In an alternative manner, the magnetic sensor is an anisotropic magneto-resistive sensor, or the magnetic sensor is a giant magneto-resistive sensor, or the magnetic sensor is a tunnel magneto-resistive sensor.
In a second aspect, the present application provides a current sensor comprising a magnetic flux sensing system as described above.
In an alternative manner, the current sensor further includes:
the error amplifier is connected with the magnetic sensor in the magnetic flux detection system and is used for amplifying and outputting the detection voltage output by the magnetic sensor;
a coil wound on a magnetic core in the magnetic flux detection system and connected with the error amplifier, the coil being configured to generate a compensation current based on a voltage output from the error amplifier, wherein a magnetic flux generated by the compensation current is configured to balance the magnetic flux generated on the magnetic core so that a product of the compensation current and a number of turns of the coil is equal to the detected current;
and a resistor connected to the coil, the resistor for generating an output voltage based on the compensation current.
The beneficial effects of this application are: the magnetic flux detection system provided by the application comprises a magnetic core and a magnetic sensor. Wherein, the magnetic core is annular structure, is provided with the recess on the magnetic core in order to form two magnetic poles. When current is detected, leakage magnetic flux passes through the two magnetic poles and the groove. The leakage magnetic flux is a part of the magnetic flux generated on the magnetic core. The magnetic sensor is arranged on the outer surface of the magnetic core and is arranged at the position of the groove. The magnetic sensor is configured to detect a leakage magnetic flux and generate a detection voltage based on the leakage magnetic flux. By the mode, the process of detecting magnetic flux is realized. Also, since the core is still a closed magnetic circuit, the reluctance of the closed magnetic circuit is small, so that a large magnetic flux is still maintained in the core, i.e. a large bandwidth of the measuring current is provided. It can be seen that the bandwidth of the measured current of the current sensor in the present application is larger, i.e. the purpose of increasing the bandwidth of the measured current of the current sensor is achieved, compared to the solution in the related art in which an air gap is completely cut through the magnetic core.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
FIG. 1 is a schematic diagram of a related art current sensor;
fig. 2 is a schematic structural diagram of a magnetic flux detection system according to a first embodiment of the present disclosure;
FIG. 3 is a schematic diagram of magnetic flux generated on a magnetic core according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a magnetic sensor according to a first embodiment of the present disclosure;
FIG. 5 is a schematic diagram of magnetic flux generated on a magnetic core according to a second embodiment of the present disclosure;
FIG. 6 is a schematic view of magnetic flux generated on a magnetic core according to a third embodiment of the present disclosure;
FIG. 7 is a schematic view of magnetic flux generated on a magnetic core according to a fourth embodiment of the present disclosure;
FIG. 8 is a schematic diagram of a current sensor according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a current sensor according to a second embodiment of the present disclosure.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a current sensor in the related art. The current sensor is a closed loop current sensor.
As shown in fig. 1, the current sensor includes a primary current wire 200, a first magnetic core 300, a hall element 400, a secondary coil 500, and an amplifier 600. Specifically, when a primary current IP flows through the primary current wire 200, the primary current IP generates a corresponding magnetic flux in the first magnetic core 300. The hall element 400, which is fixed in the air gap, detects this magnetic flux and outputs a proportional voltage. The voltage output by the hall element 400 IS amplified by the amplifier 600 and then drives the multi-turn coil (i.e., the secondary coil 500) wound on the first magnetic core 300 to output a reverse compensation current IS for counteracting the magnetic flux generated by the current IP, and finally, the magnetic flux in the magnetic circuit IS kept to be zero all the time. Meanwhile, the compensation current IS flows through the first resistor R1, and the magnitude of the compensation current IS can be determined in turn by acquiring the output voltage VOUT.
In this embodiment, the number of primary current wires 200 is assumed to be n1=1, and the number of secondary turns is assumed to be N2. When the magnetic flux in the magnetic circuit returns to zero, the primary side and the secondary side of the closed loop current sensor reach balance, and then the following steps are obtained: ip=is=n2=n2×vout/R1, where R1 IS the resistance value of the first resistor R1. Thus, a process of current detection is realized.
However, in the related art, an air gap must be completely cut on the magnetic core to put in a hall element that detects magnetic flux. For this approach, the air permeability of the air gap is very low (several thousandths of a conventional magnetic material), which causes a dramatic decrease in the equivalent permeability of the entire core, which in turn results in a smaller magnetic flux generated in the core. Eventually resulting in a smaller bandwidth of the measured current of the current sensor. Secondly, the sensitivity of the hall element to detect magnetic flux is also reduced to a large extent, which in turn results in lower accuracy in detecting current.
Based on this, the present embodiments provide a magnetic flux detection system capable of increasing the bandwidth of the measurement current of the current sensor.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a magnetic flux detection system 100 according to an embodiment of the disclosure. As shown in fig. 2, the magnetic flux detection system 100 includes a magnetic core 10 and a magnetic sensor 20.
Wherein the magnetic core 10 has a ring-shaped structure. I.e. the core 10 is formed of several components forming a closed loop structure, wherein each component is connected to its adjacent components forming a complete cycle. The core 10 is provided with a recess 11 to form two poles. When detecting current, the leakage magnetic flux passes through the two magnetic poles and the groove 11. The leakage magnetic flux is a part of the magnetic flux generated in the core 10. In other words, a part of the magnetic flux generated on the core 10 passes through the two magnetic poles and the groove 11, and this part of the magnetic flux is referred to as leakage magnetic flux in the embodiment of the present application.
Referring to fig. 3 together, the magnetic flux 12 generated on the magnetic core 10 is illustrated in fig. 3. The magnetic flux 12 includes an inner magnetic flux 121 passing through the inside of the magnetic core 10 and a leakage magnetic flux 122 passing through the recess 11. Although leakage magnetic flux 122 is significantly weaker than inner magnetic flux 121, leakage magnetic flux 122 has a proportional relationship with inner magnetic flux 121. Therefore, the detection of the inner magnetic flux 121 can be converted into the detection of the leakage magnetic flux 122. For example, detecting return to zero of leakage flux 122 is equivalent to detecting return to zero of inner flux 121.
Then, the leakage magnetic flux 122 is detected by the magnetic sensor 20 provided on the outer surface of the magnetic core 10. Specifically, the magnetic sensor 20 is provided at the position of the recess 11, and can receive the leakage magnetic flux 122. The magnetic sensor 20 can detect the leakage magnetic flux 122 and generate a detection voltage based on the leakage magnetic flux 122. The leakage flux 122, and thus the inner flux 121, can be determined in reverse based on the detected voltage.
In conclusion, the process of detecting magnetic flux is realized. Also, in this embodiment, since the magnetic core 10 is still a closed magnetic circuit, the magnetic resistance of the closed magnetic circuit is small. A larger magnetic flux is maintained in the core 10, and thus a larger bandwidth of the measured current is provided. Compared with the scheme that an air gap is completely cut on a magnetic core in the related art, the bandwidth of the measured current of the current sensor of the magnetic flux detection system provided by the embodiment of the application is larger, and the purpose of increasing the bandwidth of the measured current of the current sensor is achieved.
In some embodiments, magnetic sensor 20 is disposed parallel to the magnetic field generated by leakage flux 122. In turn, the magnetic sensor 20 is able to detect a larger magnetic flux and has a higher sensitivity, which is advantageous for improving accuracy of current detection.
In other embodiments, the air gap of the grooves in the outer surface of the magnetic core 10 is greater than the width of the die in the magnetic sensor 20 in the die sensitivity direction.
Referring to fig. 4, fig. 4 schematically illustrates one configuration of the magnetic sensor 20. Also, fig. 4 exemplifies a Tunnel Magnetoresistance (TMR) sensor. The TMR sensor is a sensor for realizing magnetic field detection by utilizing a magnetic Tunnel structure (Tunnel Magneto-Resistance), and has the characteristics of high sensitivity, quick response, low power consumption and the like.
As shown in fig. 4, a die 21 is provided in the magnetic sensor 20. The die sensitivity direction is the direction of the straight line L1, and the direction of the straight line L1 is parallel to the surface of the die 21. At this time, the width of the die 21 in the direction of the straight line L1 in the magnetic sensor 20 needs to be smaller than or equal to the air gap of the groove of the outer surface of the magnetic core 10, so that the die 21 can detect the magnetic flux of the groove of the outer surface of the magnetic core 10.
Further, the magnetic sensor 20 can detect the leakage magnetic flux parallel to the surface of the magnetic sensor 20, so the magnetic sensor 20 can be made to closely contact the outer side of the magnetic pole. And, the sensing surface of the magnetic sensor 20 (i.e. the surface provided with the die 21) and the outer surface of the magnetic pole can reach a gap of 0.01mm, so as to keep the magnetic sensor 20 to have high sensitivity to the detection of the magnetic field.
Of course, the above embodiment only illustrates one type of the magnetic sensor 20, and in other embodiments, other types of the magnetic sensor 20 may be used, which is not particularly limited in the embodiments of the present application. For example, in other embodiments, magnetic sensors such as Anisotropic Magnetoresistive (AMR) sensors or Giant Magnetoresistive (GMR) sensors may be used.
In one embodiment, the range of air gaps of the grooves on the outer surface of the magnetic core 10 is configured to be [0.1mm,0.5mm ].
Taking fig. 3 as an example, the grooves 11 are rectangular, and the air gaps of the grooves on the outer surface of the magnetic core 10 are rectangular wide. In this embodiment, by configuring the range of the air gap of the groove of the outer surface of the magnetic core to be [0.1mm,0.5mm ], it is possible to increase the magnetic flux as much as possible on the premise that the magnetic flux can be detected, so that the magnetic sensor 20 detects the magnetic flux, and has high detection sensitivity and detection accuracy. Meanwhile, the air gap of the groove on the outer surface of the magnetic core 10 is set to be larger than or equal to 0.1mm, so that the magnetic core 10 can be prevented from being difficult to produce due to the fact that the air gap is too small, in other words, the production of the magnetic core 10 can be facilitated, and the magnetic core has high practicability.
In the embodiment shown in fig. 2 and 3, the recess 11 is shown as a rectangle. While in other embodiments the recess 11 may be provided in other configurations.
For example, in some embodiments, the groove 11 is configured to: the width of the groove 11 gradually increases along the depth direction of the groove 11 on the edge of the core 10.
In this embodiment, the grooves 11 form gaps of unequal spacing. Also, along the depth direction of the groove 11 on the edge of the magnetic core 10, the width of the groove 11 gradually increases and the air gap gradually decreases. While as the width of the recess 11 increases, the cavity also increases gradually. Wherein the larger the cavity, the less likely the magnetic field will pass. Therefore, for the case where the width of the groove 11 gradually increases along the depth direction of the groove 11 on the edge of the magnetic core 10, the magnetic field is forced to pass more from where the width of the groove 11 is small, that is, the magnetic field passes more from the edge of the magnetic core 10. In other words, for the groove 11 of such a structure, the magnetic field can be concentrated where the width of the groove 11 is minimum. At this time, the magnetic field at the edge of the magnetic core 10 is strong, so that the magnetic sensor 20 is convenient to detect the magnetic flux, and has high detection sensitivity and detection accuracy.
Referring to fig. 5, a second configuration of the groove 11 is schematically shown in fig. 5. As shown in fig. 5, the recess 11 has an inverted trapezoidal structure. At this time, the air gap of the groove on the outer surface of the magnetic core 10 is the bottom of the inverted trapezoid structure.
In this embodiment, the width of the groove 11 gradually increases along the depth direction of the groove 11 on the edge of the magnetic core 10, i.e., the direction corresponding to the broken line arrow L2. The width is greatest at the top of the inverted trapezoid, and the magnetic field is least likely to pass through. Therefore, the magnetic field is forced to pass through the bottom of the inverted trapezoid. In this case, the magnetic sensor 20 is disposed near the bottom of the inverted trapezoid, so that a strong magnetic field can be detected, which is advantageous in improving the sensitivity and accuracy of detection.
Referring to fig. 6, a third configuration of the recess 11 is illustrated in fig. 6. As shown in fig. 6, the recess 11 has a fan-like structure. At this time, the air gap of the groove on the outer surface of the magnetic core 10 is the bottom of the fan-shaped structure.
In this embodiment, the width is greatest at the top of the fan-shaped structure and the magnetic field is least likely to pass. The magnetic field is forced to pass through the bottom of the fan-like structure, i.e. through the edges of the core 10. In this case, the magnetic sensor 20 is disposed near the bottom of the fan-shaped structure, so that a strong magnetic field can be detected, which is advantageous in improving the detection accuracy.
Further, in some embodiments, both poles may also be provided as active poles.
As shown in fig. 7, the two magnetic poles include a first magnetic pole A1 and a second magnetic pole A2. By adjusting the positional relationship between the first magnetic pole A1 and the second magnetic pole A2, the purpose of adjusting the air gap of the groove on the outer surface of the magnetic core 10 can be achieved. The ratio between inner flux 121 and leakage flux 122 can then be distributed to rationally design the bandwidth and accuracy of the current sensor.
Specifically, when the width of the air gap becomes large, the reluctance of the magnetic circuit of the magnetic core 10 becomes large. Which in turn makes the measured current bandwidth of the current sensor smaller. However, the magnetic flux leaking from the magnetic pole increases, the sensitivity of the magnetic sensor 20 increases, and the accuracy of the current sensor increases.
When the width of the air gap becomes smaller, the reluctance of the magnetic circuit of the magnetic core 10 becomes smaller. Which in turn increases the measured current bandwidth of the current sensor. However, the magnetic flux leaking from the magnetic pole becomes weak, the sensitivity of the magnetic sensor 20 decreases, and the accuracy of the current sensor decreases.
Embodiments of the present application also provide a current sensor that includes the magnetic flux sensing system 100 of any of the embodiments of the present application.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a current sensor according to an embodiment of the present disclosure. As shown in fig. 8, the current sensor 1000 further includes an error amplifier U1, a coil 101, and a resistor RA.
The error amplifier U1 is connected to the magnetic sensor 20 in the magnetic flux detection system 100. The coil 101 is wound around the magnetic core 10 in the magnetic flux detection system 100, and the coil 101 is connected to the error amplifier U1. The resistor RA is connected to the coil 101.
Specifically, the error amplifier U1 amplifies the detection voltage output from the magnetic sensor 20 and outputs the amplified detection voltage. The coil 101 is used to generate a compensation current based on the voltage output from the error amplifier U1. Wherein the magnetic flux generated by the compensation current is used to balance the magnetic flux generated on the magnetic core 10 so that the product of the compensation current and the number of turns of the coil 101 is equal to the detected current. Resistor RA is used to generate an output voltage based on the compensation current. Then, the magnitude of the compensation current can be determined according to the output voltage and the resistance value of the resistor RA. The detected current can be calculated according to the compensation current and the number of turns of the coil 101, thereby realizing the current detection process.
In one embodiment, the magnetic path length of the magnetic core 10 is 200mm, the cross section is 5mm by 5mm, and the relative permeability of the magnetic core 10 is 5000.
In this embodiment, if a scheme in the related art is adopted, the core 10 is cut by an air gap of 1mm as an example. The magnetic field strength of the air gap detected at this time was 0.001 tesla. If the scheme of the present application is adopted, as shown in fig. 5, the groove 11 is set to be an inverted trapezoid structure, and the air gap of the groove on the outer surface of the magnetic core 10 is set to be 0.5mm. The magnetic field strength detected at this point at 0.5mm from the outer surface of the core 10 is 0.0001 tesla.
The embodiments of the present application have a smaller magnetic field strength at the air gap relative to the solutions of the related art, because the related art cuts the magnetic core 10 completely, so that more magnetic flux is forced through the cut air gap resulting in a larger magnetic field strength. However, in the solution of the present application, the inner magnetic flux 122 is stronger, so that the inductance of the coil 101 is larger, the magnetic field generated by the magnetic core 10 is better coupled with the magnetic field generated by the coil 101, and the current bandwidth detected by the current sensor can be larger.
In the embodiment shown in fig. 8, only a current sensor having a structure in which the recess 11 is rectangular is shown. In other embodiments, the recess 11 in the current sensor may have any other structure, such as the structures shown in fig. 5-7 in the embodiments of the present application.
A current sensor having the structure shown in fig. 5 with the recess 11 is exemplarily shown in fig. 9. The specific process of current detection may refer to the description of fig. 8, and will not be described herein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in details for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A magnetic flux sensing system for use with a current sensor, the magnetic flux sensing system comprising:
the magnetic core is of an annular structure, a groove is formed in the magnetic core to form two magnetic poles, and leakage magnetic flux passes through the two magnetic poles and the groove when current is detected, wherein the leakage magnetic flux is part of magnetic flux generated on the magnetic core;
the magnetic sensor is arranged on the outer surface of the magnetic core and at the position of the groove, and is used for detecting the leakage magnetic flux and generating detection voltage based on the leakage magnetic flux.
2. The magnetic flux detection system of claim 1, wherein the width of the groove increases gradually along the depth of the groove on the edge of the core.
3. The magnetic flux detection system of claim 2, wherein the recess has an inverted trapezoidal or scalloped configuration.
4. A magnetic flux sensing system according to any one of claims 1 to 3, wherein both poles are active poles.
5. The magnetic flux detection system of claim 1, wherein the magnetic sensor is parallel to a magnetic field generated by the leakage magnetic flux.
6. The magnetic flux detection system of claim 1, wherein an air gap of the recess in the outer surface of the magnetic core is greater than a width of a die in the magnetic sensor in a direction of the die sensitivity.
7. The magnetic flux detection system of claim 1, wherein the air gap of the groove at the outer surface of the core ranges from [0.1mm,0.5mm ].
8. The magnetic flux detection system of claim 1, wherein the magnetic sensor is an anisotropic magneto-resistive sensor, or wherein the magnetic sensor is a giant magneto-resistive sensor, or wherein the magnetic sensor is a tunnel magneto-resistive sensor.
9. A current sensor comprising a magnetic flux sensing system as claimed in any one of claims 1 to 8.
10. The current sensor of claim 9, further comprising:
the error amplifier is connected with the magnetic sensor in the magnetic flux detection system and is used for amplifying and outputting the detection voltage output by the magnetic sensor;
a coil wound on a magnetic core in the magnetic flux detection system and connected with the error amplifier, the coil being configured to generate a compensation current based on a voltage output from the error amplifier, wherein a magnetic flux generated by the compensation current is configured to balance the magnetic flux generated on the magnetic core so that a product of the compensation current and a number of turns of the coil is equal to the detected current;
and a resistor connected to the coil, the resistor for generating an output voltage based on the compensation current.
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