Transformer assembly and energy meter

Abstract

The utility model discloses a kind of mutual inductor assembly and electric energy meter, it is related to electric energy meter technical field, mutual inductor assembly includes mutual inductance circuit board and multiple mutual inductors, mutual inductance circuit board has two opposite first board face;Multiple mutual inductors are integratedly installed in mutual inductance circuit board, mutual inductor includes mutual inductor body, penetrates and inserts conductor, and two interface pins of electrically connected penetrates and inserts conductor, mutual inductor body has two opposite first end face, and the perforation of penetrating two first end face, penetrates and inserts conductor and is arranged in the perforation, interface pin is located the outside of perforation and is used to be connected with wiring terminal, a first end face is set in one of first board face, first board face and the board face of main control circuit board are parallelly arranged.The utility model discloses technical scheme by the first end face of mutual inductor body and the first board face of mutual inductance circuit board set, first board face and the board face of main control circuit board are parallelly arranged, reduce the height of mutual inductor body, improve the utilization of electric energy meter internal space.

Description

Technical Field

[0001] This utility model relates to the field of electricity meter technology, and in particular to a current transformer assembly and an electricity meter. Background Technology

[0002] Current transformers, as a common current sampling device in electricity meters, are widely used in electricity meters of various specifications and models. Given a fixed size, the space occupied by a current transformer directly affects the utilization rate of the internal space of the electricity meter. Traditional electricity meter current transformers suffer from installation redundancy and inefficient connections, resulting in large space occupancy and severely impacting the utilization rate of the internal space of the electricity meter. Utility Model Content

[0003] The main purpose of this utility model is to propose a current transformer assembly and an energy meter, which aims to improve the utilization rate of the internal space of the energy meter.

[0004] To achieve the above objectives, the present invention proposes a current transformer assembly for use in an electricity meter, wherein the electricity meter has a main control circuit board and wiring terminals, and the current transformer assembly includes:

[0005] The mutual inductance circuit board has two opposing first surfaces;

[0006] Multiple current transformers are integrated and installed on the current transformer circuit board. Each current transformer includes a current transformer body, an insert conductor, and two pins electrically connected to the insert conductor. The current transformer body has two opposing first end faces and a through hole penetrating the two first end faces. The insert conductor passes through the through hole. The pins are located outside the through hole and are used to connect to the terminal block. One of the first end faces is attached to one of the first board surfaces, and the first board surface is arranged parallel to the board surface of the main control circuit board.

[0007] In one embodiment, a limiting structure is provided inside the perforation, and the inserted conductor is limited and engaged with the limiting structure to constrain the radial displacement of the inserted conductor in the perforation.

[0008] In one embodiment, the wall surface of the perforation is provided with a limiting rib protruding inward, the limiting rib extends along the axial direction of the perforation and is provided with a limiting hole, the wall surface of the limiting hole is adapted to abut against the peripheral side surface of the inserted conductive body, and the limiting hole is configured as the limiting structure.

[0009] In one embodiment, the current transformer further includes a limiting conductor connecting the through conductor and one of the pins, the limiting conductor abutting at least on a first end face of the current transformer body remote from the current transformer circuit board.

[0010] In one embodiment, the two pins include a first pin and a second pin, the limiting conductor includes an intersecting first limiting segment and a second limiting segment, the interpenetrating conductor, the second limiting segment, the first limiting segment and the first pin are connected in sequence, and the second limiting segment abuts against the first end face of the current transformer body away from the current transformer circuit board.

[0011] In one embodiment, the through conductor, the second limiting segment, the first limiting segment, and the first pin are integrally formed, the second pin is separately formed from the through conductor and is disposed on the mutual inductance circuit board, and the first pin and the second pin are electrically connected through a conductive structure on the mutual inductance circuit board.

[0012] In one embodiment, the side of the mutual inductance circuit board is provided with a limiting groove corresponding to the first limiting segment, the opening of the limiting groove faces from the through conductor toward the first limiting segment, and the first limiting segment is inserted into the limiting groove for limiting.

[0013] In one embodiment, the edge of the mutual inductance circuit board is provided with a clearance notch that communicates with the limiting groove. The first pin is located on the side of the mutual inductance circuit board away from the transformer body. A portion of the first pin is provided corresponding to the clearance notch, and a portion protrudes from the edge of the mutual inductance circuit board along the surface of the board.

[0014] In one embodiment, the mutual inductance circuit board has a first connection hole corresponding to the through conductor, the end of the through conductor protrudes through the through hole and is soldered and fixed to the first connection hole; the mutual inductance circuit board has a second connection hole corresponding to the second pin, and the second pin is soldered and fixed to the second connection hole.

[0015] This utility model also proposes an electricity meter, including the aforementioned current transformer assembly.

[0016] The technical solution of this utility model involves attaching a first end face of the current transformer body to a first surface of the current transformer circuit board, allowing the current transformer body to lie flat on the circuit board. The first surface of the circuit board is parallel to the surface of the main control circuit board, meaning the current transformer body is horizontally mounted relative to the main control circuit board. This reduces the height of the current transformer body, improves the utilization rate of the internal space of the energy meter, and lowers the overall height of the energy meter, thus meeting the need for miniaturization. Furthermore, integrating multiple current transformers onto the same current transformer circuit board not only further improves the utilization rate of the internal space of the energy meter but also facilitates the installation of the current transformers, thereby improving assembly efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of an embodiment of the current transformer assembly provided by this utility model;

[0019] Figure 2 for Figure 1 Exploded view;

[0020] Figure 3 for Figure 2 A schematic diagram of the structure of an embodiment of a mutual inductor body;

[0021] Figure 4 for Figure 2 A schematic diagram of an embodiment of the structure of the interspersed conductor, the second limiting segment, the first limiting segment and the first pin;

[0022] Figure 5 for Figure 2 A schematic diagram of the structure of the second pin in one embodiment.

[0023] Explanation of icon numbers:

[0024] 100. Mutual inductance circuit board; 200. Mutual inductor body; 300. Through conductor; 400. Limiting conductor; 500. First pin; 600. Second pin; 110. First plate surface; 120. Limiting groove; 130. Clearance notch; 140. First connecting hole; 150. Second connecting hole; 210. First end face; 220. Through hole; 230. Limiting rib; 240. Limiting hole; 410. First limiting segment; 420. Second limiting segment.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] This utility model proposes a mutual inductor assembly.

[0030] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the current transformer assembly is applied to an electricity meter. The electricity meter has a main control circuit board and wiring terminals. The current transformer assembly includes a current transformer circuit board 100 and multiple current transformers. The current transformer circuit board 100 has two opposing first plate surfaces 110. Multiple current transformers are integrated and installed on the current transformer circuit board 100. Each current transformer includes a current transformer body 200, an insert conductor 300, and two pins electrically connected to the insert conductor 300 (see first pin 500 and second pin 600). The current transformer body 200 has two opposing first end surfaces 210 and a through hole 220 penetrating the two first end surfaces 210. The insert conductor 300 passes through the through hole 220. The pins are located outside the through hole 220 and are used to connect to the wiring terminals. One first end surface 210 is fitted onto one of the first plate surfaces 110. The first plate surface 110 is arranged parallel to the plate surface of the main control circuit board. It should be noted that parallel refers to a parallel or near-parallel relationship.

[0031] Specifically, an electricity meter is an instrument used to measure electrical energy consumption. Its main control circuit board is responsible for processing current or voltage data and communication functions, while the terminals are used to connect to external circuits. The current transformer assembly is the signal acquisition module of the electricity meter, used to convert high voltage / high current signals into low voltage / low current signals for processing by the main control circuit board. The current transformer assembly includes a current transformer circuit board 100 and multiple current transformers. The multiple current transformers are integrated into a modular functional unit through the current transformer circuit board 100, responsible for specific electromagnetic induction and signal conversion.

[0032] The current transformer body 200 has two opposing first end faces 210, with through holes 220 penetrating both first end faces 210. Pins are used for electrical connection to terminals. Current enters from one terminal through one pin, flows through a conductive insert 300, and exits from another terminal through the other pin, forming a current transmission path. The conductive insert 300 is inserted into the through holes 220 of the current transformer body 200. When current passes through the conductive insert 300, an alternating magnetic field is generated around it. The iron core of the current transformer body 200 couples the magnetic field to the windings, thereby inducing a secondary current proportional to the primary current. The current transformer circuit board 100 can directly connect the two pins through internal printed circuitry, eliminating the need for additional long wires and reducing the wiring complexity and contact resistance of the current transformer.

[0033] A first surface 110 of the current transformer circuit board 100 is attached to a first end surface 210 of one of the current transformer bodies 200, and the first surface 110 is arranged parallel to the surface of the main control circuit board, such that the axis of the through hole 220 of the current transformer body 200 is perpendicular to the surface of the main control circuit board. That is, the current transformer body 200 is horizontally mounted relative to the main control circuit board. Compared with the traditional method of vertical placement of current transformers, the technical solution of this utility model reduces the height of the current transformer body 200, improves the utilization rate of the internal space of the energy meter, and reduces the overall height of the energy meter, thereby meeting the need for miniaturization of the energy meter. Moreover, the parallel arrangement of the first surface 110 and the surface of the main control circuit board also reduces the vertical overlap between the two, further optimizing the utilization rate of the internal space of the energy meter. It should be noted that attachment refers to the surface-to-surface contact of the two components, the current transformer body 200 and the current transformer circuit board 100, which have a large surface area, and does not specifically refer to a fixed connection achieved by a structure such as adhesive.

[0034] Of course, further, in other embodiments, the first end face 210 of the transformer body 200 can also be fixedly connected to the first plate face 110 of the transformer circuit board 100 by means of adhesive bonding, welding or other methods, so that the transformer body 200 and the transformer circuit board 100 form a stable mechanical fixation, which further avoids the problem of easy loosening of the traditional transformer suspended installation and improves the reliability of the long-term operation of the electricity meter.

[0035] Furthermore, integrating multiple current transformers onto a single current transformer circuit board 100 avoids the problem of traditional distributed installation of current transformers occupying extra space, thereby reducing the size of the electricity meter and better aligning with the modern trend of miniaturization and thinning of electricity meters. On the other hand, integrating multiple current transformers onto a single current transformer circuit board 100 forms a modular structure, making modular installation of the current transformers more convenient, thus improving the efficiency and consistency of current transformer assembly.

[0036] The technical solution of this utility model involves attaching a first end face 210 of the current transformer body 200 to a first plate face 110 of the current transformer circuit board 100, so that the current transformer body 200 lies flat on the current transformer circuit board 100, and the first plate face 110 is arranged parallel to the plate face of the main control circuit board. That is, the current transformer body 200 is horizontally mounted relative to the main control circuit board, which reduces the height of the current transformer body 200, improves the utilization rate of the internal space of the energy meter, and reduces the overall height of the energy meter, thereby meeting the need for miniaturization of the energy meter. At the same time, the integration of multiple current transformers on the same current transformer circuit board 100 not only further improves the utilization rate of the internal space of the energy meter, but also facilitates the installation of the current transformers, thereby improving the assembly efficiency of the current transformers.

[0037] In one implementation, please refer to Figure 1 , Figure 4 and Figure 5 The pins are plate-shaped, and the plate surface of the pin portion extends parallel to the first plate surface 110 of the mutual inductance circuit board 100.

[0038] The plate-like structure of the pin increases the effective contact area between the pin and the corresponding terminal, which not only reduces contact resistance but also improves the stability and reliability of the connection between the pin and the corresponding terminal. The terminal and the main control circuit board are generally located on adjacent side walls inside the energy meter housing. The design of the pin's plate surface extending parallel to the first plate surface 110 of the current transformer circuit board 100 simplifies the pin structure and facilitates direct connection of the pin to the terminal from the side of the current transformer assembly, avoiding the situation where the pin's plate surface is perpendicular to the first plate surface 110, leading to a complex pin structure. The pin can extend parallel to the axis of the through hole 220 in either its thickness direction or its width direction.

[0039] In other embodiments, the pins may also be elongated or cylindrical.

[0040] In one implementation, please refer to Figure 1 and Figure 3 A limiting structure is provided inside the perforation 220. The inserted conductor 300 is limited and matched with the limiting structure to constrain the radial displacement of the inserted conductor 300 in the perforation 220.

[0041] The radial direction of the through-hole 220 refers to the direction perpendicular to the insertion of the conductor 300 into the through-hole 220. The limiting structure interferes with or engages with the outer surface of the conductor 300, restricting the radial displacement of the conductor 300 within the through-hole 220. The limiting structure can be a mechanical structure such as a protrusion, groove, snap-fit, or annular flange on the inner wall of the through-hole 220. The outer surface of the conductor 300 can be limited and engaged with the limiting structure through methods such as snap-fitting into a groove, interference fit, or elastic snap-fit, thereby achieving effective positioning of the transformer body 200 and reducing the risk of unstable connection and easy shaking of the transformer body 200. In addition, it can also reduce the risk of the radial displacement of the conductor 300 causing the magnetic circuit center of its magnetic circuit with the iron core of the transformer body 200 to deteriorate, thereby reducing the magnetic flux coupling efficiency and thus helping to ensure the accuracy of the measurement results of the transformer body 200.

[0042] In other embodiments, the outer surface of the through conductor 300 may be provided with a limiting structure, which is matched with the inner wall of the through hole 220.

[0043] In one implementation, please refer to Figure 1 and Figure 3 The wall surface of the through hole 220 is provided with a limiting rib 230 protruding inward. The limiting rib 230 extends along the axial direction of the through hole 220 and is provided with a limiting hole 240. The wall surface of the limiting hole 240 is adapted to abut against the peripheral side surface of the through conductor 300. The limiting hole 240 is configured as a limiting structure.

[0044] The limiting rib 230 is a structure that protrudes inward from the wall of the through hole 220, and its extension direction is consistent with the insertion direction of the conductive body 300. The limiting rib 230 and the wall surface of the through hole 220 together define a limiting hole 240, that is, the limiting hole 240 is located inside the through hole 220, and the conductive body 300 passes through the limiting hole 240. The limiting between the wall of the limiting hole 240 and the peripheral surface of the conductive body 300 can be achieved by controlling their radial clearance, such as the distance between the wall of the limiting hole 240 and the peripheral surface of the conductive body 300 being less than the allowable radial displacement of the conductive body 300; it can also be achieved through shape matching, such as the limiting hole 240 being square and the conductive body having a square cross-section, limiting radial movement through surface contact. In this way, the radial movement or tilting of the inserted conductor 300 in the limiting hole 240 can be constrained, thus achieving effective positioning of the transformer body 200 and reducing the risk of unstable connection and easy shaking of the transformer body 200. In addition, if the inserted conductor 300 attempts to move axially along the limiting hole 240 due to vibration or thermal expansion and contraction, the limiting rib 230 will contact the surface of the inserted conductor 300 and generate friction, preventing it from sliding.

[0045] In one implementation, please refer to Figure 1 and Figure 4 The current transformer also includes a limiting conductor 400 connecting the through conductor 300 and one of the pins, the limiting conductor 400 abutting at least on a first end face 210 of the current transformer body 200 away from the current transformer circuit board 100.

[0046] One end of the limiting conductor 400 is connected to the through conductor 300, and the other end is connected to the pin. The limiting conductor 400 at least abuts against the first end face 210 of the transformer body 200 away from the transformer circuit board 100, that is, part or all of its structure is in contact with the other first end face 210 of the transformer body 200 (i.e., the first end face 210 away from the transformer circuit board 100), thus limiting the transformer body 200 at least on the side away from the transformer circuit board 100. The through conductor 300 and the limiting conductor 400, as conductors, not only transmit current but also limit the movement of the transformer body 200. The interpenetrating conductor 300 and the limiting hole 240 provide radial limiting for the transformer body 200, while the limiting conductor 400 and the transformer circuit board 100 provide axial limiting for the transformer body 200. This achieves bidirectional limiting of the transformer body 200, reduces the risk of the transformer body 200 shaking or loosening, and improves the stability and reliability of the transformer installed on the transformer circuit board 100.

[0047] Of course, in other embodiments, the limiting conductor 400 may also abut against the peripheral side of the transformer body 200 to further limit it in the radial direction.

[0048] In one implementation, please refer to Figure 1 and Figure 4 The two pins include a first pin 500 and a second pin 600. The limiting conductor 400 includes an intersecting first limiting segment 410 and a second limiting segment 420. The interpenetrating conductor 300, the second limiting segment 420, the first limiting segment 410 and the first pin 500 are connected in sequence. The second limiting segment 420 abuts against the first end face 210 of the transformer body 200 away from the transformer circuit board 100.

[0049] The two pins include a first pin 500 and a second pin 600, one for connecting to the positive terminal and the other for connecting to the negative terminal. The limiting conductor 400 includes an intersecting first limiting segment 410 and a second limiting segment 420, which combine conductivity and mechanical limiting functions. The first pin 500, the first limiting segment 410, the second limiting segment 420, and the through conductor 300 are connected sequentially. The second limiting segment 420 abuts against the first end face 210 of the transformer body 200 away from the transformer circuit board 100. The second limiting segment 420 and the transformer body 200 together limit the axial displacement of the transformer body 200, improving not only the stability and reliability of the transformer body 200 installation but also enhancing the stability of the conductive connection and the reliability of the product.

[0050] In one implementation, please refer to Figure 1 and Figure 2 The first limiting segment 410 is positioned opposite to the through conductor 300 and abuts against the peripheral side of the transformer body 200.

[0051] An insert conductor 300 passes through a through hole 220 in the transformer body 200. A first limiting segment 410 is located on the peripheral side of the transformer body 200. Both the first limiting segment 410 and the insert conductor 300 extend along the axial direction of the through hole 220. The first limiting segment 410 abuts against the peripheral side and is in direct contact with the peripheral side of the transformer body 200. The first limiting segment 410 and the insert conductor 300 together restrict the radial displacement of the transformer body 200, which not only improves the stability and reliability of the transformer body 200 installation, but also enhances the stability of the conductive connection and the reliability of the product.

[0052] The design of the first limiting segment 410, the second limiting segment 420, and the secondary bending of the inserted conductor 300 not only achieves dual axial and radial limiting of the transformer body 200, which is conducive to improving the stability and reliability of the transformer body 200 installation and preventing displacement or shaking of the transformer body 200 during assembly or use, but also helps to enhance the overall structural rigidity of the conductor.

[0053] In one implementation, please refer to Figure 1 and Figure 4 The conductor 300, the second limiting segment 420, the first limiting segment 410 and the first pin 500 are integrally formed, while the second pin 600 is separately formed from the conductor 300 and is located on the mutual inductance circuit board 100. The first pin 500 and the second pin 600 are electrically connected through the conductive structure on the mutual inductance circuit board 100.

[0054] The conductor 300, the second limiting segment 420, the first limiting segment 410, and the first pin 500 are integrally formed from the same conductive substrate through processes such as stamping and bending to form a conductive component. This integrally formed conductive assembly eliminates the connection interface of traditional discrete components through a continuous conductive substrate, reducing the risk of poor soldering and desoldering, and improving production efficiency. The second pin 600 is independently set and separate from the conductor 300. The second pin 600 and the conductor 300 are fixed to the current transformer circuit board 100 by welding, pressing, or other methods. Installing the second pin 600 as an independent component simplifies the installation process of the current transformer. Furthermore, its position can be adjusted according to the spatial design of the current transformer circuit board 100, and it facilitates later maintenance, such as replacing a damaged second pin 600 individually. The current transformer circuit board 100 has conductive structures to form a conductive path connecting the first pin 500 and the second pin 600. For example, the conductive structure can be a conductive metal layer fixed to the substrate of the mutual inductance circuit board 100 by etching or printing, and the first pin 500 and the second pin 600 are electrically connected through this path, reducing the complexity of wire connection.

[0055] In other embodiments, the first limiting segment 410 and the first pin 500 may also be connected by soldering.

[0056] In one implementation, please refer to Figure 1 and Figure 2 The side of the mutual inductance circuit board 100 is provided with a limiting groove 120 corresponding to the first limiting segment 410. The opening of the limiting groove 120 faces the direction of the self-penetrating conductor 300 toward the first limiting segment 410. The first limiting segment 410 is limited and inserted into the limiting groove 120.

[0057] The limiting groove 120 of the mutual inductance circuit board 100 is formed on the side of the mutual inductance circuit board 100, that is, on the side perpendicular to the first plate surface 110, with the groove opening facing the direction from the inserted conductor 300 toward the first limiting segment 410. The first limiting segment 410 extends from the end of the second limiting segment 420 along the axial direction of the mutual inductor body 200 to the first plate surface 110 of the mutual inductor body 200, and then is inserted into the limiting groove 120 in an insert-type assembly manner, and continues to extend toward the other first plate surface 110 of the mutual inductance circuit board 100, and finally passes through the limiting groove 120 and out of the other first plate surface 110. The limiting groove 120 has two side walls on both sides in the direction perpendicular to the through conductor 300 toward the first limiting segment 410, which limit the first limiting segment 410. When the through conductor 300 and the mutual inductance circuit board 100 are soldered, the end of the first limiting segment 410 is relative to a free end. By inserting the first limiting segment 410 into the limiting groove 120, the groove wall of the limiting groove 120 can effectively limit the swing of the first limiting segment 410, thereby facilitating the soldering of the through conductor 300. At the same time, it ensures that the first pin 500 connected to the first limiting segment 410 can be led out from the accurate position to connect with the electrical connection terminal.

[0058] In other embodiments, a limiting protrusion may be provided on the first plate surface 110 of the mutual inductance circuit board 100 facing the first end face 210, and the limiting protrusion abuts against the opposite sides of the first limiting segment 410 in a direction perpendicular to the through conductor 300 toward the first limiting segment 410.

[0059] In one implementation, please refer to Figure 1 and Figure 2 The edge of the mutual inductance circuit board 100 is provided with a clearance notch 130 that communicates with the limiting groove 120. The first pin 500 is located on the side of the mutual inductance circuit board 100 away from the transformer body 200. Part of the first pin 500 is provided corresponding to the clearance notch 130, and part of it protrudes from the edge of the mutual inductance circuit board 100 along the board surface.

[0060] The clearance notch 130 communicates with the limiting groove 120 to allow the first pin 500 to pass through. When the first limiting segment 410 passes through the limiting groove 120, the portion of the first pin 500 near the first limiting segment 410 passes through the clearance notch 130, thus limiting the first limiting segment 410 within the limiting groove 120. The first pin 500 is located on the side of the current transformer circuit board 100 away from the current transformer body 200. The width of the clearance notch 130 is slightly larger than that of the first pin 500 to prevent interference when the first pin 500 passes through the clearance notch 130, ensuring that the first limiting segment 410 can be smoothly inserted into the limiting groove 120. The portion of the first pin 500 protruding from the edge of the circuit board extends outward to directly connect to the terminal block.

[0061] In other embodiments, the thickness of the first limiting segment 410 is greater than the depth of the limiting groove 120, and the first limiting segment 410 protrudes from the opening of the limiting groove 120, or the thickness of the first limiting segment 410 is equal to the depth of the limiting groove 120, and the first limiting segment 410 is flush with the opening of the limiting groove 120, so that the first pin 500 passes directly through the outer edge of the mutual inductance circuit board 100 without the need to set an additional clearance notch 130.

[0062] In one implementation, please refer to Figure 1 and Figure 2 The mutual inductance circuit board 100 is provided with a first connection hole 140 corresponding to the through conductor 300, and the end of the through conductor 300 passes through the through hole 220 and is soldered and fixed to the first connection hole 140; the mutual inductance circuit board 100 is provided with a second connection hole 150 corresponding to the second pin 600, and the second pin 600 is soldered and fixed to the second connection hole 150.

[0063] A first connection hole 140 is provided on the mutual inductance circuit board 100 corresponding to the through conductor 300. The first connection hole 140 matches the end shape of the through conductor 300 and can be a round hole or a square hole. After one end of the through conductor 300 passes through the through hole 220 of the mutual inductor body 200, its end extends to the first connection hole 140 of the mutual inductance circuit board 100 and is fixed to the first connection hole 140 by soldering (such as reflow soldering, wave soldering, or manual soldering). After soldering, the through conductor 300 and the conductive structure on the mutual inductance circuit board 100 form a direct electrical connection.

[0064] The mutual inductance circuit board 100 also has a second connection hole 150 corresponding to the second pin 600. The shape of the second connection hole 150 matches the end shape of the second pin 600, and it can be a round hole or a square hole. The second pin 600 is fixed to the second connection hole 150 by soldering, realizing a direct electrical connection between the second pin 600 and the conductive structure on the mutual inductance circuit board 100, thereby achieving an electrical connection between the first pin 500 and the second pin 600. The soldering of the end of the conductor 300 to the first connection hole 140 and the soldering of the second pin 600 to the second connection hole 150 solves the problems of unreliable connection, high signal transmission loss, and complex assembly in traditional mutual inductors, improves the connection reliability of the mutual inductor assembly, and reduces production costs.

[0065] In other embodiments, the end of the conductor 300 and the second pin 600 can also be connected to the mutual inductance circuit board 100 by snap-fit ​​or riveting.

[0066] This utility model also proposes an electricity meter, which includes a current transformer assembly. The specific structure of the current transformer assembly is as described in the above embodiments. Since this electricity meter adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0067] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A current transformer assembly, used in an electricity meter, characterized in that, The energy meter has a main control circuit board and wiring terminals, and the current transformer assembly includes: The mutual inductance circuit board has two opposing first surfaces; Multiple current transformers are integrated and installed on the current transformer circuit board. Each current transformer includes a current transformer body, an insert conductor, and two pins electrically connected to the insert conductor. The current transformer body has two opposing first end faces and a through hole penetrating the two first end faces. The insert conductor passes through the through hole. The pins are located outside the through hole and are used to connect to the terminal block. One of the first end faces is attached to one of the first board surfaces, and the first board surface is arranged parallel to the board surface of the main control circuit board.

2. The current transformer assembly as claimed in claim 1, characterized in that, The perforation is provided with a limiting structure, and the inserted conductor is limited and matched with the limiting structure to constrain the radial displacement of the inserted conductor in the perforation.

3. The current transformer assembly as described in claim 2, characterized in that, The wall surface of the perforation is provided with a limiting rib protruding inward. The limiting rib extends along the axial direction of the perforation and is provided with a limiting hole. The wall surface of the limiting hole is adapted to abut against the peripheral side surface of the inserted conductive body. The limiting hole is configured as the limiting structure.

4. The current transformer assembly as claimed in claim 1, characterized in that, The current transformer also includes a limiting conductor connecting the through conductor and one of the pins, the limiting conductor abutting at least on a first end face of the current transformer body away from the current transformer circuit board.

5. The current transformer assembly as described in claim 4, characterized in that, The two pins include a first pin and a second pin. The limiting conductor includes an intersecting first limiting segment and a second limiting segment. The interpenetrating conductor, the second limiting segment, the first limiting segment and the first pin are connected in sequence. The second limiting segment abuts against the first end face of the current transformer body away from the current transformer circuit board.

6. The current transformer assembly as claimed in claim 5, characterized in that, The inserted conductor, the second limiting segment, the first limiting segment, and the first pin are integrally formed. The second pin is separately formed from the inserted conductor and is located on the mutual inductance circuit board. The first pin and the second pin are electrically connected through a conductive structure on the mutual inductance circuit board.

7. The current transformer assembly as claimed in claim 5, characterized in that, The side of the mutual inductance circuit board is provided with a limiting groove corresponding to the first limiting segment. The opening of the limiting groove faces from the through conductor toward the first limiting segment, and the first limiting segment is inserted into the limiting groove for limiting.

8. The current transformer assembly as claimed in claim 7, characterized in that, The edge of the mutual inductance circuit board has a clearance notch that communicates with the limiting groove. The first pin is located on the side of the mutual inductance circuit board away from the transformer body. Part of the first pin is corresponding to the clearance notch, and part of it protrudes from the edge of the mutual inductance circuit board along the surface of the circuit board.

9. The current transformer assembly as claimed in claim 5, characterized in that, The mutual inductance circuit board has a first connection hole corresponding to the through conductor, the end of the through conductor passes through the through hole and is soldered and fixed to the first connection hole; the mutual inductance circuit board has a second connection hole corresponding to the second pin, and the second pin is soldered and fixed to the second connection hole.

10. An electricity meter, characterized in that, Includes the current transformer assembly as described in any one of claims 1 to 9.

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