Magnetic field resistant shunt, power meter thereof, and manufacturing method of magnetic field resistant shunt

Abstract

The application relates to an anti-magnetic field shunt, a power meter thereof and a manufacturing method of the anti-magnetic field shunt, which comprises a shunt and a PCB board, the shunt comprises a current inflow end, a resistance body and a current outflow end which are electrically connected in sequence, the shunt is sequentially provided with a voltage end, a first sampling end and a second sampling end, the first sampling end and the second sampling end are respectively arranged on the two sides of the center of the effective resistance body; the PCB board is provided with a voltage circuit end, a first sampling circuit end and a second sampling circuit end, the PCB board is internally provided with a reclamation circuit which extends horizontally from the first sampling circuit end to the position between the second sampling circuit end, the reclamation circuit vertically divides the effective resistance body into two same areas in the horizontal direction, and the area surrounded by the reclamation circuit corresponds to the area of the effective resistance body which is interfered by the external magnetic field in the vertical direction. Therefore, the anti-magnetic field accuracy of the meter load current can be improved when the load current is in the order of milliamperes.

Description

TECHNICAL FIELD

[0001] The present application relates to an anti-magnetic field shunt for electric power instruments, an electric power meter thereof and a manufacturing method of the anti-magnetic field shunt, especially an anti-magnetic field shunt for electric energy transmission, an electric power meter thereof and a manufacturing method of the anti-magnetic field shunt. BACKGROUND

[0002] At present, the shunt has the advantages of high measurement accuracy, small temperature influence and low cost, and is widely used in single-phase intelligent electric energy meters, especially manganese-copper shunts. Due to the installation position of the shunt and the characteristics of the sampling lead, the manganese-copper shunt will generate an induced current when it is subjected to a power frequency magnetic field interference, which will seriously affect the accuracy of the measured current.

[0003] The traditional manganese-copper shunt samples current through a piece of manganese-copper alloy, and the wiring is relatively dispersed. The twisted pair of the new shunt needs to be fixed in position by dispensing or fixed in shape by a heat shrink tube, so that it is not easy to loosen. This not only consumes time and effort, but also is not conducive to automatic production. In 2013, the State Grid Corporation revised the enterprise standard for electric energy meters, and added "the voltage line of the electric energy meter is passed through 115% Un, the current loop has no current, 0.5mT power frequency magnetic field is applied to the most sensitive place of the electric energy meter, within 20 times of the theoretical starting time, the electric energy meter should not produce more than 1 pulse output" in the influence quantity test of Q / GDW1364-2013 "Technical Specification for Single-Phase Intelligent Electric Energy Meter". The proposal of this standard promotes the electric energy meter industry to actively seek solutions to improve the anti-electromagnetic interference capability of the electric energy meter.

[0004] At present, according to the latest domestic and foreign electric energy meter industry requirements, higher requirements are put forward for the anti-magnetic field interference capability of the electric energy meter with small working current, especially when the working current is 20mA or less, how to improve the precision of electric power detection under the interference of magnetic field with an intensity of 0.5mT from an uncertain direction is a problem that needs to be solved in the industry.

[0005] Therefore, it is necessary to optimize and improve the anti-magnetic field shunt and the electric power meter thereof to improve the anti-power frequency magnetic field interference capability of the shunt. SUMMARY

[0006] The purpose of the present application is to provide an anti-magnetic field shunt with anti-power frequency magnetic field interference capability under small working current, an electric power meter thereof and a manufacturing method of the anti-magnetic field shunt.

[0007] To achieve the above technical purposes, the application adopts the following technical means: an anti-magnetic field shunt, comprising a shunt and a PCB plate, the PCB plate is attached to the shunt, the shunt comprises a current inflow end, a resistance body and a current outflow end which are electrically connected in sequence, the shunt is provided with a voltage end, a first sampling end and a second sampling end in sequence along the current flow direction, the first and second sampling ends are respectively arranged on the two sides of the center of the effective resistance body along the longitudinal direction of the current flow; the PCB plate is provided with a voltage circuit end, a first sampling circuit end and a second sampling circuit end for electrically connecting the voltage end, the first sampling end and the second sampling end of the shunt respectively, the PCB plate is provided with a first side surface close to the shunt and a second side surface opposite to the first side surface, the PCB plate is provided with a reclamation circuit extending transversely from the first sampling circuit end to the position of the second sampling circuit end, the reclamation circuit vertically divides the effective resistance body into two blocks with the same area, and the area surrounded by the reclamation circuit corresponds to the area of the effective resistance body which is interfered by the external magnetic field in the longitudinal direction.

[0008] As a further improvement of the application, the reclamation circuit comprises a first section on the first side surface for electrically connecting the first sampling end and extending towards the second sampling circuit end, a second section connecting the first section and transversely crossing the PCB plate to the second side surface and close to the second sampling circuit end, a third section on the second side surface connecting the second section and extending reversely to the first sampling circuit end, a fourth section connecting the third section and transversely crossing the PCB plate to the first side surface and close to the first sampling circuit end, and a fifth section on the first side surface connecting the fourth section and extending towards the second sampling circuit end, the first section and the fifth section are electrically separated.

[0009] As a further improvement of the application, the first section comprises a first lead-out part in a straight line connecting the first sampling circuit end, the second section comprises a connecting part vertically crossing the PCB plate, the third section comprises an upper lead-back part in a straight line and an upper surrounding part surrounding the first sampling circuit end in a ring shape, the fourth section comprises a rotation part connecting the upper surrounding part and vertically crossing the PCB plate, and the fifth section comprises a first lower surrounding part surrounding the first sampling circuit end, two second lead-out parts in a straight line extending from the first lower surrounding part, and a second lower surrounding part connecting the two second lead-out parts and surrounding the second sampling circuit end, the second lead-out parts are distributed on both sides of the first lead-out part.

[0010] As a further improvement of the application, the rotation part and the second sampling circuit end are located on both sides of the first sampling circuit end.

[0011] As a further improvement of the present application, the second lower surrounding part is provided with a first leading-out end on the first side surface, and the second sampling end is provided with a second leading-out end on the second side surface, and the first leading-out end and the second leading-out end are arranged on the first side surface and the second side surface of the PCB board correspondingly.

[0012] As a further improvement of the present application, the upper surrounding part and the first lower surrounding part are arranged on the first side surface and the second side surface of the PCB board correspondingly.

[0013] As a further improvement of the present application, the voltage end, the first sampling end and / or the second sampling end are in the form of a bump protruding laterally from the shunt, the PCB board is at least a double-sided via board, the voltage circuit end, the first sampling circuit end and / or the second sampling circuit end are in the form of a metal ring via, and the voltage end, the first sampling end and / or the second sampling end are arranged in the voltage circuit end, the first sampling circuit end and / or the second sampling circuit end to realize electrical connection.

[0014] As a further improvement of the present application, an electrical information module is packaged on the PCB board, the electrical information module includes a filter element, an AD chip, and extends two ground circuit lines.

[0015] The present application also provides the following technical solutions to achieve the purpose of the application:

[0016] A power meter includes a power meter shell and the above-mentioned magnetic field shunt in the power meter shell.

[0017] The present application also provides the following technical solutions to achieve the purpose of the application:

[0018] A manufacturing method of a magnetic field shunt includes manufacturing the above-mentioned shunt and PCB board respectively.

[0019] The PCB board is manufactured, and the PCB board includes a main board part and a communication end, and the surrounding circuit is arranged on the main board part of the PCB board.

[0020] The voltage end, the first sampling end and the second sampling end of the shunt are electrically connected with the voltage circuit end, the first sampling circuit end and the second sampling circuit end of the PCB board respectively.

[0021] Components are arranged on the main board part of the PCB board to form a PCB board module, and the PCB board module is packaged to expose the communication end.

[0022] Compared with the prior art, the PCB of the application is provided with a reclamation circuit extending horizontally from the first sampling circuit end to the position of the second sampling circuit end, the reclamation circuit vertically divides the effective resistor body into two same areas, and the area surrounded by the reclamation circuit corresponds to the area of the effective resistor body disturbed by the external magnetic field. Thus, the anti-interference ability is strong, the reliability is high, and when the anti-magnetic field shunt is applied to a very small working current, the ammeter accuracy difference can be very small in the face of strong magnetic field interference. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the anti-magnetic field shunt and the PCB of the first embodiment of the application.

[0024] Figure 2 is a structural exploded view in Figure 1 .

[0025] Figure 3 is a structural schematic diagram of the anti-magnetic field shunt and the PCB of the first embodiment of the application.

[0026] Figure 4 is a structural schematic diagram of the anti-magnetic field shunt and the PCB of the first embodiment of the application. Figure 3

[0027] Figure 5 is a structural schematic diagram of the anti-magnetic field shunt and the PCB of the first embodiment of the application.

[0028] Figure 6 is a structural schematic diagram of the anti-magnetic field shunt and the PCB of the first embodiment of the application.

[0029] Figure 7 is a structural schematic diagram of the anti-magnetic field shunt and the PCB of the first embodiment of the application.

[0030] Figure 8 is a structural schematic diagram of the anti-magnetic field shunt and the PCB of the first embodiment of the application.

[0031] Figure 9 is a structural schematic diagram of the anti-magnetic field shunt and the PCB of the first embodiment of the application.

[0032] Figure 10 is a structural schematic diagram of the anti-magnetic field shunt and the PCB of the first embodiment of the application.

[0033] Figure 11 is a structural schematic diagram of the anti-magnetic field shunt and the PCB of the first embodiment of the application.

[0034] Figure 12 is a structural exploded view in Figure 11 .

[0035] Figure 13 ​is Figure 11 Structure diagram of the anti-magnetic field shunt and the PCB after encapsulation.

[0036] Figure 14 is the structure diagram of the anti-magnetic field shunt and the PCB of the third embodiment of the present application.

[0037] Figure 15 is Figure 14 Structure exploded view in the anti-magnetic field shunt.

[0038] Figure 16 is Figure 14 Structure diagram of the anti-magnetic field shunt and the PCB after encapsulation.

[0039] Reference signs:

[0040] Anti-magnetic field shunt 100

[0041] Shunt 1 current inflow end 11

[0042] Connecting hole 111 resistance body 12

[0043] Current outflow end 13 connecting hole 131

[0044] Voltage end 14 first sampling end 15

[0045] Second sampling end 16 PCB module 2

[0046] PCB 20 mainboard end 201

[0047] First sampling line end 2011 reclamation line 21

[0048] First section 211 first lead-out part 2111

[0049] Second section 212 connecting part 2121

[0050] Third section 213 upper lead-back part 2131

[0051] Upper surrounding part 2132 fourth section 214

[0052] Rotary part 2141 fifth section 215

[0053] First lower surrounding part 2151 second lead-out part 2152

[0054] Second lower surrounding part 2153 first lead-out end 2154

[0055] Second sampling line end 22 second lead-out end 221

[0056] Voltage line end 23 communication end 202

[0057] Grounding circuit 2021 package module 26

[0058] First side 24 second side 25

[0059] Terminal 3, 4 fixing hole 31, 42

[0060] Anti-magnetic field shunt 200 terminal 2001

[0061] Anti-magnetic field shunt 300 extension 3001

[0062] Connecting hole 3002 DETAILED DESCRIPTION

[0063] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0064] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the scope of the application its application or uses.

[0065] Techniques and equipment known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the specification where appropriate.

[0066] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation. Thus, other examples of exemplary embodiments can have different values.

[0067] Note that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0068] In the field of shunt applications, as a supplier who is familiar with market demand, Wida Electronics Co., Ltd. is well aware of the problems existing in the prior art. Its R&D team has further invested huge amounts of money on the basis of its own original technology, and has carried out long-term and large-scale experiments, scheme screening, and a large number of customer surveys, and finally obtained the technical scheme of the present application.

[0069] Please refer to Figures 1 to 16 As shown in the structure schematic diagram of the anti-magnetic field shunt 100, 200, 300 of the present application. Please refer to Figures 1 to 10In the first embodiment, the anti-magnetic field shunt 100 comprises a shunt 1 and a PCB board 20 which is attached to the shunt 1 closely, the shunt 1 comprises a current inflow end 11, a resistance body 12 and a current outflow end 13 which are electrically connected in sequence, the shunt 1 is provided with a voltage end 14, a first sampling end 15 and a second sampling end 16 in sequence along the direction of current flow, the first and second sampling ends 15, 16 are respectively arranged on the two sides of the center of the effective resistance body 12 along the longitudinal direction of current flow; the PCB board 20 is provided with a voltage circuit end 23, a first sampling circuit end 2011 and a second sampling circuit end 22 which are respectively used to electrically connect the voltage end 14, the first sampling end 15 and the second sampling end 16 on the shunt 1, the PCB board 20 is provided with a first side 24 which is close to the shunt 1 and a second side 25 which is opposite to the first side 24, the PCB board 20 is provided with a reclamation circuit 21 which extends transversely from the first sampling circuit end 2011 to the position of the second sampling circuit end 22, the reclamation circuit 21 vertically divides the effective resistance body 12 into two blocks with the same area, the area surrounded by the reclamation circuit corresponds to the area of the effective resistance body which is interfered by external magnetic field in the longitudinal direction. In this way, the reclamation circuit 21 on the PCB board 20 divides the effective resistance body 12 into areas with the same area, when facing high-intensity magnetic field interference in an uncertain direction, the current generated by the effective resistance body 12 cutting the magnetic induction lines can be offset by the current generated by the reclamation circuit 21 cutting the magnetic induction lines, when the anti-magnetic field shunt 100 is applied to a very small working current and faces a strong magnetic field interference, the accuracy error of the ammeter can still be very small, for example, under the working current of 20 mA or below and the magnetic field interference of 0.5 mT, the accuracy error of the ammeter of the anti-magnetic field shunt 100 can be less than 10%, in this way, the power meter can achieve excellent anti-magnetic field interference under a very small working current.

[0070] The surrounding line 21 includes a first segment 211 on the first side 24 for electrically connecting the first sampling line end 2011 and extending towards the second sampling line end 22, a second segment 212 connecting the first segment 211 and crossing the PCB 20 to the second side 25 and close to the second sampling line end 22, a third segment 213 on the second side 25 connecting the second segment 212 and extending reversely to the first sampling line end 2011, a fourth segment 214 connecting the third segment 213 and crossing the PCB 20 to the first side 24 and close to the first sampling line end 2011, a fifth segment 215 on the first side 24 connecting the fourth segment 214 and extending towards the second sampling line end 22, and the first segment 211 and the fifth segment 215 are electrically separated. In this way, the surrounding line 21 can meet the sampling requirement from the horizontal direction, and can be surrounded as a ring line from the vertical direction, with a corresponding surrounding area, and the related lines in the surrounding area will not be short-circuited.

[0071] Specifically, the first segment 211 includes a first linear lead-out part 2111 connecting the first sampling line end 2011, the second segment 212 includes a connecting part 2121 vertically crossing the PCB 20, the third segment 213 includes a linear upper lead-back part 2131 and an upper surrounding part 2132 surrounding the first sampling line end 2011 peripherally and connecting the upper lead-back part 2131, the fourth segment 214 includes a turning part 2141 connecting the upper surrounding part 2132 and vertically crossing the PCB 20, and the fifth segment 215 includes a first lower surrounding part 2151 surrounding the first sampling line end 2011 peripherally, two linear second lead-out parts 2152 extending from the first lower surrounding part 2151, and a second lower surrounding part 2153 connecting the two second lead-out parts 2152 and surrounding the second sampling line end 22 peripherally. In this way, the arrangement of the surrounding parts 2132, 2151 and 2153 can better avoid short-circuiting of adjacent lines and better meet the sampling requirement and the surrounding area requirement.

[0072] The turning part 2141 and the second sampling line end 22 are located on both sides of the first sampling line end 2011. In this way, in the present embodiment, to avoid short-circuiting contact between the connecting part 2121 and the second sampling line end 22, the connecting part 2121 does not completely reach the second sampling line end 22, and the turning part 2141 placed outside the first sampling line end 2011 can make the surrounding line 21 have an area corresponding to the area of the resistor 12 disturbed by the external magnetic field in the vertical direction.

[0073] The second lower surrounding part 2153 is provided with a first leading end 2154 on the first side 24, and the second sampling end 16 is provided with a second leading end 221 on the second side 25, and the first leading end 2154 and the second leading end 221 are correspondingly arranged on the first side 24 and the second side 25 of the PCB 20. In this way, the first leading end 2154 and the second leading end 221 are correspondingly arranged on the PCB 20, which can make the sampling data more accurate and not easily affected by electromagnetic interference.

[0074] The upper surrounding part 2132 and the first lower surrounding part 2151 are correspondingly arranged on the first side 24 and the second side 25 of the PCB 20. In this way, the interference area of the surrounding circuit 21 in each direction can better correspond to the longitudinal interference area of the resistor body 12.

[0075] The voltage end 14, the first sampling end 15 and / or the second sampling end 16 are in the form of protrusions laterally protruding from the shunt 1 and located in the same plane, and the PCB 20 is at least a double-sided via board. The voltage circuit end 23, the first sampling circuit end 2011 and / or the second sampling circuit end 22 are in the form of metal ring holes provided by vias, and the voltage end 14, the first sampling end 15 and / or the second sampling end 16 are inserted into the voltage circuit end 23, the first sampling circuit end 2011 and / or the second sampling circuit end 22 to realize electrical connection. In this way, when the PCB 20 and the shunt 1 are installed, only the voltage end 14, the first sampling end 15 and / or the second sampling end 16 in the form of protrusions need to be inserted into the metal holes of the voltage circuit end 23, the first sampling circuit end 2011 and / or the second sampling circuit end 22, and welding can realize installation and electrical connection.

[0076] The PCB 20 is packaged with an electrical information module, which together forms a packaging module 26. The electrical information module includes a filtering element, an AD chip, and extends two ground circuit lines 2021. In this way, the ground circuit line 2021 can effectively avoid surge voltage breakdown of the module elements.

[0077] The magnetic field shunt 100 is provided with a connecting hole 111 on the current inflow end 11 and a connecting hole 131 on the current outflow end 13, and the connecting holes 111 and 131 are respectively used for riveting the wiring ends 3 and 4. The wiring ends 3 and 4 are provided with fixing holes 31 and 41 for fixing to the power meter shell (not shown), and the wiring ends 3 and 4 are used for electrically holding the cable.

[0078] Referring to Figures 11 to 13As shown in the figure, it is a structural schematic diagram of the anti-magnetic field shunt 200 of the second embodiment of the application, and the anti-magnetic field shunt 200 is integrally extended with a terminal 2001 on both sides in the longitudinal direction. In this way, the manufacturing and assembly are facilitated.

[0079] Referring to Figures 14 to 16 As shown in the figure, it is a structural schematic diagram of the anti-magnetic field shunt 300 of the third embodiment of the application, and the anti-magnetic field shunt 300 is integrally extended with an extension 3001 on both sides in the longitudinal direction. The extension 3001 is provided with a connecting hole 3002, and the connecting hole 3002 is used for riveting a terminal knob. In this way, the riveting of the terminal knob is facilitated, and the connecting hole 3002 can also be removed for welding.

[0080] The application further includes a fourth embodiment of the anti-magnetic field shunt structure. The connecting hole is used for horizontally riveting the terminal knob, so that the riveting of the terminal knob is facilitated, and the connecting hole can also be removed for welding.

[0081] The application also protects a power meter (not shown in the figure), which includes a power meter shell (not shown in the figure) and the anti-magnetic field shunt 100, 200, 300 in the power meter shell. The main core component of the power meter is the anti-magnetic field interference of the anti-magnetic field shunt 100, 200, 300. The anti-magnetic field interference of the anti-magnetic field shunt 100, 200, 300 under the condition of small working current and high magnetic field interference can make the power meter have excellent power data detection accuracy, and make the power meter have a core market competitive advantage.

[0082] The application also protects a manufacturing method of the anti-magnetic field shunt 100, 200, 300. Taking the first embodiment as an example, the method includes manufacturing the shunt 1 and the PCB board 20 respectively; manufacturing the PCB board 20, which includes a main board end 201 and a communication end 202, and setting the surrounding circuit 21 on the main board end 201 of the PCB board 20; electrically connecting the voltage end 14, the first sampling end 15, and the second sampling end 16 of the shunt 1 with the voltage circuit end 23, the first sampling circuit end 2011, and the second sampling circuit end 22 of the PCB board 20 respectively; setting components on the main board end 201 of the PCB board 20 to form a PCB board module 2, and packaging the PCB board module 2 to expose the communication end 202. The above steps are not limited in sequence. In this way, the components of the PCB board module 2 can be better protected under the condition of high temperature and high humidity, and the shunt 1, the PCB board 20, and the installation method therebetween can make the anti-magnetic field shunt 100, 200, 300 have excellent anti-magnetic field interference under the condition of small working current and high magnetic field interference, and improve the power data detection accuracy of the power meter.

[0083] Figure 6 ,11 The arrow directions shown in FIGS. 12, 13, and 15 are current directions.

[0084] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0085] The terms "front", "rear", "left", "right", "upper", "lower", and the like as used herein to describe the embodiments of the application, are only used for convenience and are not intended to connote or suggest directions or orientations of the application in actual use.

[0086] The technical features of the above-described embodiments can be combined in any manner, and for brevity, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not contradict each other, they should be considered within the scope of the present disclosure.

[0087] The above-described embodiments are merely illustrative of the present application and do not limit the scope of the patent. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which should be considered within the scope of the present application. Therefore, the scope of the patent protection of the present application should be subject to the appended claims.

Claims

1. A magnetic field shunt, characterized in that: It includes a splitter and a PCB board, with the PCB board mounted close to the splitter. The shunt includes a current inlet, a resistor, and a current outlet connected in sequence. The shunt is provided with a voltage terminal, a first sampling terminal, and a second sampling terminal in sequence along the direction of current flow. The first and second sampling terminals are respectively located on both sides of the center of the effective resistor in the longitudinal direction of current flow. The PCB board is provided with voltage line terminals, first sampling line terminals, and second sampling line terminals respectively for electrically connecting to the voltage terminals, first sampling terminals, and second sampling terminals on the shunt. The PCB board has a first side close to the shunt and a second side opposite to the first side. The PCB board has a reclamation line extending laterally from the first sampling line terminal to the position of the second sampling line terminal. The reclamation line vertically divides the effective resistor into two equal areas, and in the longitudinal direction of the effective resistor, the reclamation area enclosed by the annular reclamation line corresponds to the area of ​​the effective resistor that is affected by external magnetic field interference in the longitudinal direction.

2. The anti-magnetic field shunt according to claim 1, characterized in that: The reclamation line includes a first segment located on the first side for electrically connecting to the first sampling end and extending towards the second sampling line end; a second segment connecting to the first segment and traversing the PCB board to the second side and close to the second sampling line end; a third segment located on the second side connecting to the second segment and extending in the opposite direction towards the first sampling line end; a fourth segment connecting to the third segment and traversing the PCB board to the first side and close to the first sampling line end; and a fifth segment located on the first side connecting to the fourth segment and extending towards the second sampling line end. The first segment and the fifth segment are electrically separated.

3. The anti-magnetic field shunt according to claim 2, characterized in that: The first segment includes a straight first lead-out portion connected to the first sampling line end; the second segment includes a connecting portion that vertically passes through the PCB board; the third segment includes a straight upper lead-back portion and an upper surrounding portion that connects the upper lead-back portion and surrounds the first sampling line end in a ring shape; the fourth segment includes a rotating portion that connects to the upper surrounding portion and vertically passes through the PCB board; and the fifth segment includes a first lower surrounding portion surrounding the first sampling line end, two straight second leads-out portions extending from the first lower surrounding portion, and a second lower surrounding portion that connects the two second leads-out portions and surrounds the second sampling line end. The second leads-out portions are distributed on both sides of the first leads-out portion.

4. A magnetic field shunt according to claim 3, characterized in that: The rotating part and the second sampling line end are located on both sides of the first sampling line end.

5. A magnetic field shunt according to claim 3, characterized in that: The second lower surrounding portion has a first lead-out end on the first side, and the second sampling end has a second lead-out end on the second side. The first lead-out end and the second lead-out end are correspondingly arranged on the first side and the second side of the PCB board.

6. A magnetic field shunt according to claim 3, characterized in that: The upper surrounding portion and the first lower surrounding portion are respectively disposed on the first side and the second side of the PCB board.

7. A magnetic field shunt according to claim 1, characterized in that: The voltage terminal, the first sampling terminal, and / or the second sampling terminal are convex points laterally protruding from the shunt. The PCB board is at least a double-sided perforated board. The voltage line terminal, the first sampling line terminal, and / or the second sampling line terminal are metal ring holes with vias. The voltage terminal, the first sampling terminal, and / or the second sampling terminal are electrically connected by passing through the voltage line terminal, the first sampling line terminal, and / or the second sampling line terminal.

8. A magnetic field shunt according to claim 1, characterized in that: The PCB board is encapsulated with an electrical information module, which includes a filter element, an AD chip, and two ground lines extending from it.

9. An electrical meter, characterized in that: It includes a power meter housing and an anti-magnetic field shunt located within the power meter housing according to any one of claims 1 to 8.

10. A method for manufacturing a magnetic field shunt, characterized in that: This includes manufacturing the shunt as described in claims 1 to 8 and the PCB board, respectively; The PCB board is manufactured, the PCB board includes a main board and a communication terminal, and the reclamation circuit is disposed on the main board of the PCB board; Connect the voltage terminal, first sampling terminal, and second sampling terminal on the shunt to the voltage line terminal, first sampling line terminal, and second sampling line terminal on the PCB board respectively. Components are arranged on the main body of the PCB board to form a PCB board module, and the PCB board module is encapsulated to expose the communication terminal.

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