Framework and current transformer made of same

Abstract

The framework and the current transformer made of the framework are suitable for an assembly mode between a conductor and a magnetic ring needing a penetrating structure, the framework structurally comprises a framework body, the conductor and a PCB carrier plate structure, the conductor and the framework are integrally formed, one single wall of the conductor penetrates out of the framework at the position capable of penetrating through an inner ring of the magnetic ring, and the conductor is arranged in the framework body. The other single wall of the conductor penetrates out of the side surface of the framework; terminal pins and supporting legs are arranged at the lower end of the framework, arc-shaped limiting bosses are arranged at the tops of the supporting legs, the limiting bosses are symmetrically distributed, the magnetic rings are placed on the limiting bosses, and the terminal pins are used for being welded to a PCB. Compared with the prior art, the current transformer provided by the utility model can improve the assembly efficiency of such products, reduce the operation repetition times, and is small in assembly difficulty. The size precision is improved, and the relative size between the magnetic ring and the conductor of the mutual inductor after installation is ensured.

Description

Technical Field

[0001] This utility model relates to a current transformer for residual current detection, and more particularly to a current transformer made from a frame with a structure in which the conductor and the magnetic ring are intersected or pass through each other. Background Technology

[0002] In the assembly process of mutual inductors, due to limitations in process design and product size, some assembly schemes for skeletons and magnetic rings that require interlocking structures require multiple assembly and positioning steps. Existing conventional solutions involve assembling each component independently using various fixing methods in sequence. This is more difficult than installing a single conductor, especially when relatively fixed, requiring external assistance. The small product size makes positioning difficult, and the pin displacement deformation is high. Therefore, the installation and positioning methods have a significant impact on the pin positioning dimensions of the assembled product. Thus, pre-positioning the entire assembly is key to improving installation efficiency.

[0003] The current method of interlocking conductor bobbin and current transformer magnetic ring basically involves fixing the conductor and bobbin first, then fixing the bobbin to the PCB carrier board, and then fixing the current transformer magnetic ring. If there is a difference in the positioning of the conductor and bobbin, the subsequent positions of the conductor and current transformer will be offset, resulting in a large difference in the overall pin spacing of the product.

[0004] Currently, the positioning and installation of various components primarily rely on hole positioning and fixtures. Even with fixtures, the small size of the product limits the need for manual shaping during assembly to ensure conductor coaxiality. This results in numerous repetitive operations and unstable positioning dimensions.

[0005] With the development of power supply technology, smaller size is a major trend. Internal components are becoming more and more complex, and gaps are getting smaller and smaller. We need to consider how to reduce the difficulty of production and the number of components that need to be assembled during the production process. This is a priority in the design layout.

[0006] The disadvantages of existing technologies are: 1. A large number of installation components; 2. Requires external auxiliary installation; 3. Involves many mating points, making it easy to misinstall; 4. The relative spacing dimensions are unstable after installation. Utility Model Content

[0007] The purpose of this utility model is to provide a small-volume current transformer that can realize an integrated frame and conductor assembly structure, suitable for assembly methods between conductors and magnetic rings that require interlocking structures. The solution is as follows:

[0008] A current transformer, suitable for transformers with an interlocking assembly structure between the conductor and the magnetic ring, includes a conductor, a magnetic ring, and a frame. The conductor is a U-shaped needle, and the conductor and the frame are integrally formed. One single wall of the conductor protrudes from the frame at a position that can penetrate the inner ring of the magnetic ring, and the other single wall of the conductor protrudes from the side of the frame. The lower end of the frame is provided with terminal pins and support feet. The top of the support feet is provided with arc-shaped limiting bosses, which are symmetrically distributed. The magnetic ring is placed on the limiting bosses, and the terminal pins are used for soldering and mounting to a PCB board.

[0009] Preferably, the conductor and the frame are integrally formed by injection molding or pre-embedded molding process, eliminating the need for reassembly.

[0010] Preferably, the skeleton includes a partition, the middle section of the conductor is wrapped inside the partition, and the skeleton has two limiting protrusions that extend outward along the front and back of the partition, respectively; the number of magnetic rings is two, which are placed on the two limiting protrusions.

[0011] Preferably, the number of supporting feet at the lower end of the frame is one.

[0012] Preferably, the partition of the skeleton is further provided with a limiting flange protruding outward in the middle, so as to realize the rapid insertion and assembly and precise positioning of the magnetic ring.

[0013] This utility model also provides a current transformer frame, suitable for current transformers with an interlocking assembly structure between the conductor and the magnetic ring. It includes a conductor integrally formed with the frame, the conductor being a U-shaped needle. One single wall of the conductor protrudes from the frame at a position that allows it to penetrate the inner ring of the magnetic ring, and the other single wall of the conductor protrudes from the side of the frame. The lower end of the frame is provided with a support foot and terminal pins. The top of the support foot is provided with an arc-shaped limiting boss, which is symmetrically distributed. A partition is provided in the middle of the frame, and the middle section of the conductor is wrapped inside the partition. The frame has two limiting bosses, which extend outwards along the front and back sides of the partition, respectively.

[0014] Preferably, the frame has one supporting leg.

[0015] Preferably, the partition of the skeleton is further provided with a limiting flange protruding outward in the middle, so as to realize the rapid insertion and assembly and precise positioning of the magnetic ring.

[0016] As described above, the current transformer of this utility model integrates the conductor and the frame through injection molding or pre-embedded encapsulation; the magnetic ring of the transformer is limited and pre-positioned by the boss structure on the frame; the pre-positioning of the frame conductor and the magnetic ring of the transformer achieves a relatively stable molding size; and the frame assembly is fixed by welding the terminal pins of the frame to the pin holes of the PCB board.

[0017] Compared with existing technologies, this utility model of current transformer reduces assembly difficulty and simplifies assembly by changing the assembly method. The frame and conductor are integrally injection molded as a single component, eliminating the need for reassembly and fixing of the conductor and frame during installation in transformers or other products that require conductors and magnetic rings to be interlocked. This assembly method is less difficult and more precise than previous multi-component assemblies, ensuring product reliability and improving production efficiency, thus facilitating modular assembly.

[0018] In summary, the beneficial effects of this utility model current transformer are as follows:

[0019] 1. Improved efficiency, reduced repetitive operations, and easier assembly;

[0020] 2. Improved dimensional accuracy ensures the relative dimensions between the transformer's magnetic ring and the conductor after installation. Attached Figure Description

[0021] Figure 1 This is a perspective view of the integrally formed conductor and frame structure of the current transformer of this utility model.

[0022] Figure 2 This is a perspective view of the integrally formed structure of the conductor and frame of the current transformer of this utility model.

[0023] Figure 3 This is a three-dimensional schematic diagram of the application assembly of the current transformer of this utility model.

[0024] The reference numerals in the above figures are explained as follows:

[0025] 10. Frame, 101. Terminal pin, 102. Limiting flange, 103. Partition, 20. Conductor, 201, 202. Single arm of conductor, 30. Support foot, 40. Limiting boss, 50. Magnetic ring, 60. PCB board Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

[0027] like Figure 1 and Figure 2The image shows a perspective view of the current transformer of this utility model from two angles. The current transformer is suitable for transformers with an interlocking assembly structure between the conductor and the magnetic ring. It includes a conductor 20, a magnetic ring 50, and a frame 10. The conductor 20 is a U-shaped needle, integrally formed with the frame 10. A single wall 201 of the conductor protrudes from the frame at a position that allows it to penetrate the inner ring of the magnetic ring, and a single wall 202 of the conductor protrudes from the side of the frame. The lower end of the frame 10 is provided with terminal pins 101 and support feet 30. The top of the support feet is provided with arc-shaped limiting bosses 40, which are symmetrically distributed. The magnetic ring 50 is placed on the limiting bosses 40. The terminal pins 101 of the frame are used for soldering and mounting to a PCB board 60. Preferably, the frame 10 includes a partition 103 located in the middle of the frame, with the middle section of the conductor encased within the partition 103. The frame has two (or two pairs) limiting bosses, extending outwards along the front and back sides of the partition 103, respectively. Two magnetic rings are placed on the two limiting bosses. A limiting flange 102 also protrudes outwards from the middle of the partition of the frame 10 to facilitate rapid insertion and precise positioning of the magnetic rings. Compared to existing technologies, this current transformer integrates the frame and conductor through injection molding, pre-forming them as a single component. In transformers or other products requiring conductor-magnetic-ring insertion, reassembly and fixation of the conductor and frame are unnecessary during installation. Thus, this current transformer, through structural optimization, changes the assembly method of the current transformer, reducing assembly difficulty and making the assembly of the current transformer simpler and easier to use. The skeleton body is designed with symmetrical arc-shaped limiting bosses that fit into the inductor magnetic ring, which can make the center dimensions of the magnetic ring and the skeleton conductor horizontal.

[0028] Specifically, in the power transformer device made with an integrated frame, the frame body 10 and the conductor 20 are injection molded as a single unit without assembly, avoiding assembly and installation. The frame structure is provided with a frame pre-positioning limiting boss 40 and a limiting flange 102 for placing the magnetic ring 50 of the transformer, thereby realizing the rapid insertion and precise positioning of the conductor and the magnetic ring. At the same time, at least one support foot is set at the bottom of the frame to support the positioning of the frame on the PCB board.

[0029] This utility model presents a current transformer structure comprising a frame body and a conductor. It proposes an integrated molding method for the frame and conductor, and a limiting scheme for the frame and magnetic ring. These improvements enhance assembly efficiency, reduce repetitive operations, and simplify assembly. The integrated molding ensures the stability of the relative distance between the magnetic ring and conductor, improving dimensional accuracy and guaranteeing the relative dimensions between the magnetic ring and conductor after installation.

[0030] The specific assembly and implementation steps of the current transformer of this utility model are as follows:

[0031] Step 1: Place the skeleton body 10 horizontally on the PCB board using the support feet of the skeleton body, and support the skeleton on the PCB board using at least one skeleton support foot 30.

[0032] Step 2: Place the two magnetic rings of the current transformer on the frame. The two magnetic rings of the current transformer are fixed in both horizontal and vertical directions by the pre-positioning and limiting functions of the arc features of the limiting boss 40 and the limiting flange 102 of the frame.

[0033] Step 3: Solder or fix the entire current transformer to the PCB board 60 to realize the structural layout application assembly of the current transformer.

[0034] The assembly scheme of this utility model current transformer is applicable to the assembly method between conductors and magnetic rings that require interlocking structures. It has low assembly difficulty and high assembly accuracy, which not only ensures the reliability of the product, but also improves the production efficiency of the product.

[0035] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this utility model.

Claims

1. A current transformer, suitable for transformers with an interlocking assembly structure between the conductor and the magnetic ring, comprising a conductor, a magnetic ring, and a frame, wherein the conductor is a U-shaped needle, characterized in that: The conductor and the frame are integrally formed. One single wall of the conductor protrudes from the frame at a position that can penetrate the inner ring of the magnetic ring, and the other single wall of the conductor protrudes from the side of the frame. The lower end of the frame is provided with terminal pins and support feet. The top of the support feet is provided with arc-shaped limiting bosses. The limiting bosses are symmetrically distributed. The magnetic ring is placed on the limiting bosses. The terminal pins are used for soldering and installation with the PCB board.

2. The current transformer according to claim 1, characterized in that: The conductor and the frame are integrally formed by injection molding or pre-embedded plastic sealing process, eliminating the need for reassembly.

3. The current transformer according to claim 1, characterized in that: The skeleton includes a partition, the middle section of the conductor is wrapped inside the partition, and the skeleton has two limiting bosses that extend outward along the front and back of the partition, respectively; the number of magnetic rings is two, which are placed on the two limiting bosses.

4. The current transformer according to claim 1, characterized in that: The frame has one supporting leg at its lower end.

5. The current transformer according to claim 1, characterized in that: The partition of the skeleton also has a limiting flange protruding outward in the middle, which is used to realize the rapid insertion and assembly and precise positioning of the magnetic ring.

6. A frame for a current transformer, suitable for transformers with an interlocking assembly structure between the conductor and the magnetic ring, characterized in that: Including conductors, The conductor and the skeleton are integrally formed. The conductor is a U-shaped needle. One single wall of the conductor protrudes from the skeleton at a position that can penetrate the inner ring of the magnetic ring, and the other single wall of the conductor protrudes from the side of the skeleton. The lower end of the frame is provided with support feet and terminal pins. The top of the support feet is provided with arc-shaped limiting bosses, which are symmetrically distributed. The middle part of the frame is provided with a partition, and the middle section of the conductor is wrapped in the partition. There are two limiting bosses in the frame, which extend outward along the front and back of the partition, respectively.

7. The frame of the current transformer according to claim 6, characterized in that: The frame has one supporting foot at its lower end.

8. The frame of the current transformer according to claim 6, characterized in that: The partition of the skeleton also has a limiting flange protruding outward in the middle, which is used to realize the rapid insertion and assembly and precise positioning of the magnetic ring.

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