Anti-magnetic shunt, its power meter and method for manufacturing the anti-magnetic shunt

Abstract

The present invention relates to an anti-magnetic shunt, an electric power meter thereof, and a manufacturing method of the anti-magnetic shunt, which includes a sheet-shaped shunt and a PCB board. The sheet-shaped shunt includes a current inlet end, a resistor body, and a current outlet end; the resistor body is mechanically cut into an upper-side resistor body and a lower-side resistor body with the same area, and the upper-side and lower-side resistor bodies are mutually offset to form a gap for attaching and plugging the PCB board; the sheet-shaped shunt is provided with a voltage end, a first sampling end, and a second sampling end. The first sampling end is arranged on the lower side of the connection between the current inlet end and the lower-side resistor body, and the second sampling end is arranged on the upper side of the connection between the current outlet end and the upper-side resistor body; the PCB board is provided with a voltage end circuit, a first sampling end circuit, and a second sampling end circuit, and the PCB board is provided with an upper-side conductive foil and a lower-side conductive foil. The first sampling end, the lower-side and upper-side conductive foils are electrically connected to the first sampling end circuit. In this way, the anti-magnetic accuracy of the instrument load current at the milliampere level is improved.

Description

Technical Field

[0001] The present invention relates to an anti-magnetic shunt for power instruments, its power meter and a manufacturing method of the anti-magnetic shunt, in particular to an anti-magnetic shunt for the field of power transmission, its power meter and a manufacturing method of the anti-magnetic shunt. Background Art

[0002] Currently, the advantages of shunts with high measurement accuracy, small temperature influence and low cost are widely used in single-phase smart energy meters, especially manganese copper shunts; due to the installation position of the shunt and the characteristics of the connected sampling wires, the manganese copper shunt will generate induced current when it is interfered by the power frequency magnetic field, 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 scattered. For the twisted pair of the new shunt, it is necessary to fix the position by dispensing or fix the shape with a heat shrink tube to make it not easy to loosen. This not only takes time and effort, but also is not conducive to automated production. In 2013, the State Grid Corporation of China revised the enterprise standard for energy meters. In the influencing quantity test of Q / GDW1364-2013 "Technical Specification for Single-Phase Smart Energy Meters", a new item was added: "When the voltage circuit of the energy meter is energized with 115% Un and the current circuit has no current, apply a 0.5 mT power frequency magnetic field to the most sensitive part of the energy meter affected by the magnetic field, and within 20 times the theoretical starting time, the energy meter should not generate more than 1 pulse output". The proposal of this standard has prompted the energy meter industry to actively seek solutions to improve the anti-electromagnetic interference ability of energy meters.

[0004] Currently, according to the latest domestic and foreign requirements of the energy meter industry, higher requirements are put forward for the anti-magnetic interference ability of energy meters with small working currents. Especially when the working current is 20 mA or less, in the face of a magnetic field interference with a strength of 0.5 mT from an uncertain direction, how to improve the accuracy of power detection is an urgent problem in the industry.

[0005] Therefore, it is necessary to optimize and improve the anti-magnetic shunt and its power meter to improve the anti-power frequency magnetic field interference ability of the shunt. Summary of the Invention

[0006] The purpose of the present invention is to provide an anti-magnetic shunt, its power meter and a manufacturing method of the anti-magnetic shunt that can resist power frequency magnetic field interference under a small working current.

[0007] To achieve the above technical purpose, the present invention adopts the following technical means: An anti-magnetic shunt includes a sheet-shaped shunt and a PCB board, and the PCB board is electrically connected to the sheet-shaped shunt.

[0008] The sheet shunt includes a current inflow end, a resistor body, and a current outflow end that are electrically connected in sequence;

[0009] The resistor body is mechanically cut into two resistor bodies with the same area along the direction of current flowing through the resistor body, forming an upper resistor body and a lower resistor body along the current flowing direction. The upper resistor body and the lower resistor body are mutually misaligned, and the mutual misalignment forms a gap for attaching and plugging the PCB board;

[0010] The sheet shunt is sequentially provided with a voltage end, a first sampling end, and a second sampling end along the current flowing direction. The first sampling end is arranged below the connection between the current inflow end and the lower resistor body, and the second sampling end is arranged above the connection between the current outflow end and the upper resistor body;

[0011] The PCB board is inserted between the upper resistor body and the lower resistor body. The PCB board is provided with a voltage end circuit, a first sampling end circuit, and a second sampling end circuit for electrically connecting to the voltage end, the first sampling end, and the second sampling end respectively. Among them, the PCB board is provided with an upper conductive foil and a lower conductive foil whose areas correspond to and are opposite to the areas of the corresponding upper resistor body and lower resistor body. The first sampling end, the upper conductive foil, and the lower conductive foil are electrically connected to the first sampling end circuit.

[0012] As a further improvement of the present invention, the PCB board is at least a double-sided via board, so that the upper conductive foil and the lower conductive foil are electrically connected through via holes.

[0013] As a further improvement of the present invention, the PCB board is provided with a plurality of via hole parts arranged in sequence corresponding to the gap, and the upper conductive foil and the lower conductive foil are electrically connected through the via hole parts.

[0014] As a further improvement of the present invention, the PCB board is provided with a longitudinal main body part for plugging into the gap and a side part connected to the side of the main body part; the voltage end circuit is arranged on the side part; the first sampling end circuit, the upper conductive foil, the lower conductive foil, and the second sampling end circuit are all arranged on the main body part. The main body part is provided with a first connection hole for plugging the first sampling end and a second connection hole for plugging the second sampling end. The first connection hole is electrically connected to the lower conductive foil, and the second connection hole is electrically connected to the second sampling end circuit.

[0015] As a further improvement of the present invention, an electrical information module is encapsulated on the PCB board. The voltage end circuit, the first sampling end circuit, and the second sampling end circuit are used to connect to the electrical information module. The electrical information module includes a filtering element, an analog-to-digital conversion chip, and / or a metering chip.

[0016] As a further improvement of the present invention, the thickness of the PCB board corresponds to the size of the gaps that are offset from each other.

[0017] As a further improvement of the present invention, the resistor body is a manganin resistor body.

[0018] As a further improvement of the present invention, through holes are provided at the current inflow end and the current outflow end for electrically connecting terminal buttons; or no through holes are provided at the current inflow end and the current outflow end, and terminal wires are respectively connected thereto.

[0019] To achieve the above technical objectives, the present invention can also adopt the following technical means:

[0020] An electric power meter includes an electric power meter housing and the anti-magnetic shunt located within the electric power meter housing.

[0021] To achieve the above technical objectives, the present invention can also adopt the following technical means:

[0022] A manufacturing method of an anti-magnetic shunt includes separately manufacturing the sheet-shaped shunt and the PCB board;

[0023] Pass the PCB board through the gaps and plug it into and out of the sheet-shaped shunt vertically;

[0024] Electrically connect the voltage terminal, the first sampling terminal, and the second sampling terminal on the sheet-shaped shunt to the voltage terminal circuit, the first sampling terminal circuit, and the second sampling terminal circuit on the PCB board respectively.

[0025] Compared with the prior art, in the present invention, the resistor body is mechanically cut into two resistor bodies with the same area along the flowing direction of the current through the resistor body, forming an upper-side resistor body and a lower-side resistor body along the flowing direction of the current. The upper-side resistor body and the lower-side resistor body are offset from each other, and the offset forms gaps for attaching and plugging the PCB board. The PCB board is provided with a voltage terminal circuit, a first sampling terminal circuit, and a second sampling terminal circuit respectively for electrically connecting to the voltage terminal, the first sampling terminal, and the second sampling terminal. Among them, the PCB board is provided with an upper-side conductive foil and a lower-side conductive foil whose areas correspond to and are opposite to the areas of the corresponding upper-side resistor body and lower-side resistor body. The first sampling terminal, the upper-side conductive foil, and the lower-side conductive foil are electrically connected to the first sampling terminal circuit. With such a setting, the anti-interference ability is strong and the reliability is high. When the anti-magnetic shunt is applied even to an extremely small working current, in the face of strong magnetic field interference, the meter accuracy difference can be extremely small. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the sheet-shaped shunt of the anti-magnetic shunt according to the first embodiment of the present invention;

[0027] Figure 2 is Figure 1Structural schematic diagram from another angle in

[0028] Figure 3 It is a structural schematic diagram of the anti-magnetic shunt in the first embodiment of the present invention.

[0029] Figure 4 It is a structural schematic diagram of the connection between the anti-magnetic shunt and the terminal button in the first embodiment of the present invention.

[0030] Figure 5 It is a side view of the sheet shunt of the anti-magnetic shunt in the first embodiment of the present invention.

[0031] Figure 6 It is a structural schematic diagram of the PCB board of the anti-magnetic shunt in the first embodiment of the present invention.

[0032] Figure 7 It is a diagram of the PCB board of the anti-magnetic shunt in the first embodiment of the present invention with the insulation layer removed.

[0033] Figure 8 It is a structural schematic diagram of the sheet shunt of the anti-magnetic shunt in the second embodiment of the present invention.

[0034] Figure 9 It is Figure 8 Structural schematic diagram from another angle in

[0035] Figure 10 It is Figure 8 Side view in

[0036] Figure 11 It is Figure 8 Structural schematic diagram from yet another angle in

[0037] Figure 12 It is a structural schematic diagram of the anti-magnetic shunt in the second embodiment of the present invention.

[0038] Figure 13 It is an exploded structural schematic diagram of the anti-magnetic shunt in the third embodiment of the present invention.

[0039] Figure 14 It is a structural schematic diagram of the anti-magnetic shunt in the third embodiment of the present invention.

[0040] Figure 15 It is a structural schematic diagram of the anti-magnetic shunt in the fourth embodiment of the present invention.

[0041] Figure 16 It is a structural schematic diagram of the anti-magnetic shunt in the fifth embodiment of the present invention.

[0042] Figure 17 It is a structural schematic diagram of the PCB board of the anti-magnetic shunt in the fourth or fifth embodiment of the present invention and the telecommunication system module.

[0043] Figure 18 is Figure 17 a structural schematic diagram of another angle in

[0044] Figure 19 is Figure 17 a structural schematic diagram of removing the insulating layer in

[0045] Reference numerals:

[0046] Anti-magnetic shunts 100, 200, 300, 400, 500

[0047] Current inlet ends 11, 11' of the sheet shunt 1

[0048] Upper resistor body 121 of the resistor body 12

[0049] Lower resistor body 122 Gap 123

[0050] Current outlet ends 13, 13' Voltage terminal 101

[0051] First sampling terminal 102 Second sampling terminal 103

[0052] Terminal 14, 14' Anti-slip grooves 141, 141'

[0053] PCB board 2 Main body 21

[0054] First connection hole 211 Second connection hole 212

[0055] Side part 22 Conductive foil 23

[0056] Upper conductive foil 231 Lower conductive foil 232

[0057] Via hole part 24 Voltage terminal circuit 201

[0058] First sampling terminal circuit 202 Second sampling terminal circuit 203

[0059] Electrical information module 3 Terminal button 4 Detailed implementation manners

[0060] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention.

[0061] The following description of at least one exemplary embodiment is actually merely illustrative and in no way limits the present invention or its application or use.

[0062] Technologies and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies and devices should be regarded as part of the specification.

[0063] In all of the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0064] It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0065] In the field of shunt applications, as a supplier familiar with market demands in the industry, Weida Electronics Co., Ltd. is well aware of the problems existing in the prior art. Its R & D team has further invested heavily on the basis of its own original technologies, conducted long-term and extensive tests, solution screening, and extensive customer surveys, and finally obtained the technical solution of the present invention.

[0066] Please refer Figures 1 to 19As shown, it is a schematic structural diagram of the anti-magnetic shunts 100, 200, 300, 400, 500 of the present invention. In the first embodiment, an anti-magnetic shunt 100 includes a sheet-shaped shunt 1 and a PCB board 2. The PCB board 2 is electrically connected to the sheet-shaped shunt 1. The sheet-shaped shunt 1 includes a current inflow end 11, a resistor body 12, and a current outflow end 13 that are electrically connected in sequence. The two end faces of the resistor body 12 on both sides are respectively welded to one side face of the current inflow end 11 and one side face of the current outflow end 13 to form a three-metal strip. The resistor body 12 is mechanically cut into two resistor bodies 12 with the same area along the direction of the current flowing through the resistor body 12, forming an upper resistor body 121 and a lower resistor body 122 along the direction of the current flow. The upper resistor body 121 and the lower resistor body 122 are mutually offset, and a gap 123 is formed by the mutual offset for attaching and inserting the PCB board 2. The "attaching and inserting" means that the PCB board 2 is placed in parallel and close to the upper resistor body 121 and the lower resistor body 122 respectively. The sheet-shaped shunt 1 is sequentially provided with a voltage terminal 101, a first sampling terminal 102, and a second sampling terminal 103 along the direction of the current flow. The first sampling terminal 102 is provided on the lower side of the connection between the current inflow end 11 and the lower resistor body 122. The second sampling terminal 103 is provided on the upper side of the connection between the current outflow end 13 and the upper resistor body 121. The "connection" means that the first sampling terminal 102 can be provided on the current inflow end 11 close to the weld between the current inflow end 11 and the lower resistor body 122, or can be provided on the resistor body 12 close to the weld between the current inflow end 11 and the lower resistor body 122, or can be provided on the weld between the current inflow end 11 and the lower resistor body 122; the second sampling terminal 103 can be provided on the current outflow end 13 close to the weld between the current outflow end 13 and the upper resistor body 121, or can be provided on the resistor body 12 close to the weld between the current outflow end 13 and the upper resistor body 121, or can be provided on the weld between the current outflow end 13 and the upper resistor body 121. The PCB board 2 is inserted between the upper resistor body 121 and the lower resistor body 122 in the up-down direction. The PCB board 2 is provided with a voltage terminal circuit 201, a first sampling terminal circuit 202, and a second sampling terminal circuit 203 for electrically connecting to the voltage terminal 101, the first sampling terminal 102, and the second sampling terminal 103 respectively. Among them, the PCB board 2 is provided with an upper conductive foil 231 and a lower conductive foil 232 whose areas correspond to and are opposite to the areas of the corresponding upper resistor body 121 and lower resistor body 122. The first sampling terminal 102, the upper conductive foil 231, and the lower conductive foil 232 are electrically connected to the first sampling terminal circuit 202.The fact that the areas of the upper conductive foil 231 and the lower conductive foil 232 correspond to the areas of the corresponding upper resistor body 121 and lower resistor body 122 means that: the upper conductive foil 231 and the upper resistor body 121 are roughly in corresponding positions and have roughly the same area; the lower conductive foil 232 and the lower resistor body 122 are roughly in corresponding positions and have roughly the same area. Specifically, the upper conductive foil 231 and the lower conductive foil 232 are respectively located on the front and back two layers of the PCB board 2, and are vertically offset from each other, so that the upper conductive foil 231 and the upper resistor body 121 are roughly corresponding in position, shape and area and are separated by the insulating layer of the PCB board 2, which can prevent short circuit between the upper conductive foil 231 and the upper resistor body 121; the lower conductive foil 232 and the lower resistor body 122 are roughly corresponding in position, shape and area and are separated by the insulating layer of the PCB board 2, which can prevent short circuit between the lower conductive foil 232 and the lower resistor body 122. In this way, when facing high-intensity magnetic field interference in an uncertain direction, the current generated by the upper resistor body 121 and the lower resistor body 122 cutting the magnetic induction lines can cancel out the current generated by the upper conductive foil 231 and the lower conductive foil 232 cutting the magnetic induction lines. In different embodiments of the present invention, the vertical positions of the upper conductive foil 231 and the lower conductive foil 232 are not limited, as long as they can be vertically offset, they are within the protection scope of the present invention. Therefore, when the anti-magnetic field shunt 100 is applied even with an extremely small working current and faces strong magnetic field interference, the meter accuracy error can be extremely small. For example, when the working current is 20 mA or less and faces a magnetic field interference with an intensity of 0.5 mT, the meter accuracy error of the anti-magnetic field shunt 100 can be less than 10%, so that excellent anti-magnetic field interference can be achieved for the power meter at an extremely small working current.

[0067] The PCB board 2 is at least a double-sided via-plated board, so that the upper conductive foil 231 and the lower conductive foil 232 are electrically connected through vias. With such a setting, the upper conductive foil 231 and the lower conductive foil 232 located on different layers of the PCB board 2 can be electrically connected. In this embodiment, the upper conductive foil 231 and the lower conductive foil 232 are respectively located on the front and back sides of the PCB board 2. In other embodiments of the present invention, the PCB board 2 can also be provided with multiple internal conductive layers, as long as the electrical connection of the sampling circuit is achieved and electrical isolation is maintained between the PCB board 2 and the corresponding resistor bodies 121 and 122.

[0068] The PCB board 2 is provided with a plurality of via portions 24 arranged in sequence corresponding to the gap 123, and electrical connection between the upper conductive foil 231 and the lower conductive foil 232 is achieved through the via portions 24. In the illustrated embodiment, the via portions 24 may be in the shape of a metal cylinder, and in other embodiments, they may also be in other conductive shapes. With such a setting, the sequentially arranged via portions 24 can be located at the position of the gap 123 in the front-back and up-down directions, avoiding short circuits with surrounding components while achieving good electrical connection of the sampling circuit and improving the use safety. The thickness of the PCB board 2 corresponds to the size of the mutually offset gap 123, so that the PCB board 2 can be better matched with the shape and position of the gap 123, achieving better structural stability and power transmission stability.

[0069] The PCB board 2 is provided with a longitudinal main body portion 21 for being inserted into the gap 123, and a side portion 22 connected to the side of the main body portion 21; the voltage terminal circuit 201 is arranged on the side portion 22; the first sampling terminal circuit 202, the conductive foil 23 (i.e., the upper conductive foil 231 and the lower conductive foil 232), and the second sampling terminal circuit 203 are all arranged on the main body portion 21. The main body portion 21 is provided with a first connection hole 211 for inserting the first sampling terminal 102 and a second connection hole 212 for inserting the second sampling terminal 103 at intervals in the up-down direction. The first connection hole 211 is electrically connected to the lower conductive foil 232, and the second connection hole 212 is electrically connected to the second sampling terminal circuit 203. With such a setting, the PCB board 2 can be better fitted and installed with the sheet shunt 1.

[0070] Please refer Figures 15 to 19 As shown, as a further optimization and improvement of the present invention, an electrical information module 3 is encapsulated on the PCB board 2, and the voltage terminal circuit 201, the first sampling terminal circuit 202, and the second sampling terminal circuit 203 are used to connect to the electrical information module 3. With such a setting, after the anti-magnetic field shunt 100 detects the sampling information, it is immediately converted into a digital signal by the electrical information module 3 on the side for further transmission. The digital signal can be free from magnetic field interference, thus further improving the measurement accuracy of the anti-magnetic field shunt 100.

[0071] Specifically, the electrical information module 3 includes a filtering element, an analog-to-digital conversion chip, and / or a metering chip. That is, in different embodiments of the present invention, the electrical information module 3 can selectively include any one, several, or all of the filtering element, the analog-to-digital conversion chip, and the metering chip. With such a setting, the electrical information module 3 can convert the sampling information detected by the anti-magnetic field shunt 100 into a digital signal for transmission.

[0072] In this embodiment, the resistor body 12 is a manganin resistor body. In this way, excellent sampling accuracy can be achieved. Of course, in other embodiments of the present invention, the resistor body 12 can also be other types of resistor bodies.

[0073] Please refer to Figures 1 to 5 In the first embodiment shown, through holes are provided at the current inlet end 11 and the current outlet end 13 for electrically connecting to the terminal block 4; please refer to Figures 8 to 12 In the second embodiment and Figures 13 to 14 in the third embodiment shown, through holes are not provided at the current inlet end 11' and the current outlet end 13' of the anti-magnetic field shunts 200 and 300, and connection terminals 14 and 14' are respectively connected. The differences between the second and third embodiments include the different direction settings of the connection terminals 14 and 14'. Concave and convex anti-slip grooves 141 and 141' are provided at the ends of the connection terminals 14 and 14', which can prevent the connection wire (not shown) from detaching during the wiring process. In different embodiments of the present invention, the current inlet end 11 and the current outlet end 13 can be planar for direct docking with the terminal block; or, like in the second and third embodiments, the current inlet end 11' and the current outlet end 13' are respectively set as stepped shapes corresponding to the upper-side resistor body 121 and the lower-side resistor body 122 integrally. Refer to Figure 8 、 Figure 14 shown, which is convenient for manufacturing and assembly with the PCB board.

[0074] The present invention also protects a power meter (not shown), which includes a power meter housing (not shown) and the anti-magnetic field shunts 100, 200, 300, 400, and 500 located inside the power meter housing. The main core component of the power meter lies in the anti-magnetic field interference of the anti-magnetic field shunts 100, 200, 300, 400, and 500. The anti-magnetic field interference of the anti-magnetic field shunts 100, 200, 300, 400, and 500 under the conditions of small working current and high magnetic field interference enables the power meter to have excellent power data detection accuracy, giving the power meter a core market competitive advantage.

[0075] The present invention also protects a method for manufacturing anti-magnetic shunts 100, 200, 300, 400, 500, which includes manufacturing the sheet-shaped shunt 1 and the PCB board 2 respectively; passing the PCB board 2 through the gap 123 and plugging it up and down on the sheet-shaped shunt 1; electrically connecting the voltage terminal 101, the first sampling terminal 102, and the second sampling terminal 103 on the sheet-shaped shunt 1 to the voltage terminal circuit 201, the first sampling terminal circuit 202, and the second sampling terminal circuit 203 on the PCB board 2 respectively. With such settings, the sheet-shaped shunt 1, the PCB board 2, and the installation method therebetween can enable the anti-magnetic shunts 100, 200, 300, 400, 500 to have excellent anti-magnetic interference under the conditions of small working current and high magnetic field interference, and improve the accuracy of power data detection of power meters.

[0076] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0077] The series of orientation terms such as front, back, left, right, up, and down used for the technical features of the above-described embodiments are only used for convenient description and understanding of the technical features, and do not constitute a limitation on the specific direction in the actual use of the technical solution.

[0078] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0079] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. An anti-magnetic shunt, characterized in that: It includes a sheet-shaped shunt and a PCB board, and the PCB board is electrically connected to the sheet-shaped shunt. The sheet-shaped shunt includes a current inflow end, a resistor body, and a current outflow end that are electrically connected in sequence. The resistor body is mechanically cut into two resistor bodies with the same area along the direction of the current flowing through the resistor body, forming an upper resistor body and a lower resistor body along the current flow direction. The upper resistor body and the lower resistor body are mutually misaligned, and the misalignment forms a gap for inserting and attaching the PCB board. The sheet-shaped shunt is sequentially provided with a voltage terminal, a first sampling terminal, and a second sampling terminal along the current flow direction. The first sampling terminal is provided on the lower side of the connection between the current inflow end and the lower resistor body, and the second sampling terminal is provided on the upper side of the connection between the current outflow end and the upper resistor body. The PCB board is inserted between the upper resistor body and the lower resistor body. The PCB board is provided with a voltage terminal circuit, a first sampling terminal circuit, and a second sampling terminal circuit for electrically connecting to the voltage terminal, the first sampling terminal, and the second sampling terminal respectively. Among them, the PCB board is provided with an upper conductive foil and a lower conductive foil whose areas correspond to and are opposite to the areas of the corresponding upper resistor body and lower resistor body. A conductive component is provided inside the PCB board to electrically connect between the upper conductive foil and the lower conductive foil, so that the first sampling terminal, the upper conductive foil, the lower conductive foil, and the first sampling terminal circuit are electrically connected.

2. The anti-magnetic shunt according to claim 1, characterized in that: The PCB board is at least a double-sided hole-plated board, and the electrical connection between the upper conductive foil and the lower conductive foil is achieved through hole plating.

3. The anti-magnetic shunt according to claim 1, characterized in that: The PCB board is provided with a plurality of via portions arranged in sequence corresponding to the gap, and the electrical connection between the upper conductive foil and the lower conductive foil is achieved through the via portions.

4. The anti-magnetic shunt according to claim 1, characterized in that: The PCB board is provided with a longitudinal main body portion for inserting into the gap and a side portion connected to the side of the main body portion. The voltage terminal circuit is provided on the side portion. The first sampling terminal circuit, the upper conductive foil, the lower conductive foil, and the second sampling terminal circuit are all provided on the main body portion. The main body portion is provided with a first connection hole for inserting the first sampling terminal and a second connection hole for inserting the second sampling terminal. The first connection hole is electrically connected to the lower conductive foil, and the second connection hole is electrically connected to the second sampling terminal circuit.

5. The anti-magnetic shunt according to claim 1, characterized in that: An electrical information module is encapsulated on the PCB board. The voltage terminal circuit, the first sampling terminal circuit, and the second sampling terminal circuit are used to connect to the electrical information module. The electrical information module includes a filtering element, an analog-to-digital conversion chip, and / or a metering chip.

6. The anti-magnetic shunt according to claim 1, characterized in that: The thickness of the PCB board corresponds to the size of the mutually misaligned gap.

7. The anti-magnetic shunt according to claim 1, characterized in that: The resistor body is a manganese copper resistor body.

8. The anti-magnetic shunt according to claim 1, characterized in that: The current inflow end and the current outflow end are provided with through holes for electrically connecting terminal buttons; or the current inflow end and the current outflow end are not provided with through holes but are respectively connected with terminals.

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

10. A manufacturing method of an anti-magnetic shunt, characterized in that: It includes a sheet-shaped shunt and a PCB board for manufacturing the anti-magnetic shunt according to claims 1 to 8 respectively. Pass the PCB board through the gap and insert it up and down on the sheet-shaped shunt. Electrically connect the voltage terminal, the first sampling terminal, and the second sampling terminal on the sheet shunt to the voltage terminal circuit, the first sampling terminal circuit, and the second sampling terminal circuit on the PCB board, respectively.

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