Common mode inductor

Abstract

The utility model relates to a common mode inductance relates to common mode inductance technical field, it contains: magnetic ring, winding at the first flat coil of one end of magnetic ring surface, winding at the second flat coil of the other end of magnetic ring surface and with the corresponding setting of first flat coil, the bottom plate for first flat coil and second flat coil installation is assembled to the bottom side of magnetic ring, and the partition is assembled in the magnetic ring with interference, the first wire hole and the second wire hole are provided on the bottom plate, the end of first flat coil is provided with the first pin, and the end of second flat coil is provided with the second pin, the first pin of first flat coil is arranged on the bottom side of bottom plate through the first wire hole, and the second pin of second flat coil is arranged on the bottom side of bottom plate through the second wire hole, adopt above technical scheme, have effectively suppressed conducted interference and radiation interference, have improved the advantage of the suppression effect to common mode interference.

Description

Technical Field

[0001] This utility model relates to the field of common mode inductor technology, and specifically to a common mode inductor. Background Technology

[0002] In the field of solar photovoltaic (PV) and energy storage inverters, common-mode inductors, as core components for suppressing electromagnetic interference (EMI), are widely used in inverter circuit systems, especially at grid ports, load ports, and other signal / energy transmission ports, to suppress common-mode interference and ensure the inverter's electromagnetic compatibility (EMC). As key equipment in solar power generation systems for converting DC to AC energy, PV inverters operate in environments involving connections to photovoltaic modules, energy storage batteries, the grid, and various loads. The circuits experience high-frequency switching and current surges, which easily generate common-mode interference. The layout and performance of the common-mode inductor directly affect the overall system's EMC performance. In existing applications of common-mode inductors in PV inverters, the magnetic ring layout and winding method have not been optimized for the high-frequency interference characteristics of PV inverters, resulting in insufficient suppression of common-mode interference. This makes it impossible to effectively control EMC conducted and radiated interference, causing the EMC conducted and radiated indicators of PV inverters to frequently exceed relevant standard limits in actual development and application, affecting the normal operation of the equipment. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings and deficiencies of the existing technology by providing a common-mode inductor that solves at least one of the aforementioned technical problems. This inductor effectively suppresses conducted and radiated interference, thus improving the suppression effect on common-mode interference.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a common mode inductor, comprising: a magnetic ring, a first flat coil wound around one end of the surface of the magnetic ring, a second flat coil wound around the other end of the surface of the magnetic ring and corresponding to the first flat coil, a base plate assembled on the bottom side of the magnetic ring for mounting the first flat coil and the second flat coil, and a partition plate interference-fitted into the magnetic ring; The base plate is provided with a first wire through hole and a second wire through hole, the end of the first flat coil is provided with a first pin, and the end of the second flat coil is provided with a second pin; The first pin of the first flat coil passes through the first wire hole and is inserted into the bottom side of the base plate, and the second pin of the second flat coil passes through the second wire hole and is inserted into the bottom side of the base plate.

[0005] In a further embodiment of this invention, the magnetic ring is made of nanocrystalline material or ferrite material.

[0006] In a further embodiment of this invention, the magnetic ring is circular or polygonal.

[0007] The present invention further provides that an adhesive layer is provided between the magnetic ring and the first flat coil and the second flat coil.

[0008] The present invention further provides that the two ends of the base plate are provided with a first extension portion and a second extension portion, and the first extension portion and the second extension portion are staggered to provide for the installation of the first pin and the second pin respectively.

[0009] The present invention further comprises the first flat coil and / or the second flat coil comprising: a coil body, and an insulating adhesive covering the surface of the coil body.

[0010] In a further improvement of this invention, the coil body is made of copper.

[0011] In a further embodiment of this invention, both the base plate and the partition plate are made of epoxy board material. After adopting the above technical solution, the beneficial effects of this utility model are as follows: In this utility model, by correspondingly setting the first flat coil and the second flat coil respectively wound around the two ends of the magnetic ring, a superimposed magnetic field can be generated when the common mode interference current passes through, thereby enhancing the inductive reactance to suppress the common mode interference. Moreover, the wire hole design of the base plate and the interference fit of the partition plate realize the stable fixation of the coil and the magnetic ring, save internal space, and make the overall structure compact, ensuring the stability and safety of the installation. Attached Figure Description

[0012] 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 these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of a common-mode inductor. Figure 2 This is a schematic diagram of the common-mode inductor from another perspective; Figure 3 This is a schematic diagram of two common-mode inductors mounted on a circuit board.

[0014] Explanation of reference numerals in the attached drawings: 1. Magnetic ring; 2. First flat coil; 21. First pin; 3. Second flat coil; 31. Second pin; 4. Base plate; 41. First wire hole; 42. Second wire hole; 43. First extension; 44. Second extension; 5. Partition. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings.

[0016] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive element, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0017] This embodiment relates to a common-mode inductor, as shown in the reference... Figures 1-2 The system includes: a magnetic ring 1, a first flat coil 2, a second flat coil 3, a base plate 4, and a partition plate 5. The magnetic ring 1, the first flat coil 2, and the second flat coil 3 are all mounted on the top surface of the base plate 4. The magnetic ring 1, as the carrier of the coils, is the core component for suppressing interference and provides the foundation for the magnetic field generated by the coils. The first flat coil 2 and the second flat coil 3 are both wound around the surface of the magnetic ring 1, and are correspondingly distributed, allowing the common-mode interference current to generate a unidirectional magnetic field that is superimposed, effectively suppressing conducted and radiated interference, and enhancing inductive reactance to suppress common-mode interference. Furthermore, the flat structure of the two coils helps save space and adapts to the limited installation environment inside the photovoltaic-storage inverter. The base plate 4 is mounted on the bottom side of the magnetic ring 1, fixing the relative position of the coils and the magnetic ring 1, preventing loosening from affecting the interference suppression effect. The partition plate 5 is interference-fitted inside the magnetic ring 1, serving as structural support to enhance overall robustness. The partition plate 5 also provides isolation and insulation, preventing electromagnetic interference and eliminating the risk of short circuits. The base plate 4 is provided with a first wire-passing hole 41 and a second wire-passing hole 42. The end of the first flat coil 2 is provided with a first pin 21, and the end of the second flat coil 3 is provided with a second pin 31. The first pin 21 passes through the first wire-passing hole 41 and is inserted into the bottom side of the base plate 4, and the second pin 31 passes through the second wire-passing hole 42 and is inserted into the bottom side of the base plate 4. The pins passing through the wire-passing holes into the bottom side of the base plate 4 improves the compactness of the layout and facilitates the connection between the coil and the circuit board.

[0018] Reference Figure 2 It should be noted that the end of the first flat coil 2 is stripped to form the first pin 21, and the end of the second flat coil 3 is stripped to form the second pin 31. After tinning the first pin 21 and the second pin 31, they are directly inserted into the circuit board, which facilitates manufacturing, simplifies the process, and increases efficiency. In use, the user mounts the common-mode inductor onto the circuit board using the first pin 21 and the second pin 31 on the bottom side of the base plate 4. (Refer to...) Figure 3 By placing two common-mode inductors on the circuit board, the common-mode interference can be better suppressed, resulting in better performance.

[0019] Specifically, in this embodiment, the magnetic ring 1 is made of nanocrystalline material, which has high magnetic permeability and can enhance the absorption and suppression of high-frequency common-mode interference, thereby improving the suppression effect of EMC conducted and radiated interference. In some embodiments, the magnetic ring 1 may also be made of other materials such as ferrite.

[0020] Specifically, in this embodiment, the magnetic ring 1 is circular, and the magnetic field distribution of the circular magnetic ring 1 is relatively uniform. When the coil is wound around the surface of the circular magnetic ring 1, the magnetic field generated when the common-mode interference signal passes through can be more easily superimposed, thereby enhancing the inductive impedance to common-mode interference. In some embodiments, the magnetic ring 1 may also be in the shape of other polygons such as triangle, rectangle, or pentagon.

[0021] In this embodiment, an adhesive layer is provided between the magnetic ring 1 and the first flat coil 2 and the second flat coil 3. The adhesive layer is glue, which ensures the stability between the magnetic ring 1 and the coil.

[0022] In this embodiment, refer to Figure 2 The base plate 4 has a first extension 43 and a second extension 44 extending from both ends. The first extension 43 and the second extension 44 are staggered to accommodate the first pin 21 and the second pin 31, respectively. The staggered arrangement of the two extensions reduces the area of ​​the base plate 4, enhances the compactness of the layout, and saves installation space.

[0023] In this embodiment, refer to Figure 1 The first flat coil 2 and / or the second flat coil 3 include a coil body and insulating adhesive. Specifically, in this embodiment, the coil body is made of a single strand of copper. Copper has excellent conductivity, which reduces losses during current transmission and ensures that a magnetic field is effectively generated when common-mode current passes through the coil. Furthermore, copper has good ductility, making it easy to process the coil. In some embodiments, the coil body may also be made of other materials such as brass, aluminum, or silver. Insulating adhesive is applied to the surface of the coil body to isolate the electrical connection between the coil and other components, avoiding the risk of short circuits.

[0024] In this embodiment, both the base plate 4 and the partition plate 5 are made of epoxy board. In some embodiments, the base plate 4 and the partition plate 5 may also be made of other materials such as bakelite board, fiberglass, or polyester board.

[0025] The above is only used to illustrate the technical solution of this utility model and not to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A common-mode inductor, characterized in that, include: A magnetic ring (1), a first flat coil (2) wound around one end of the surface of the magnetic ring (1), a second flat coil (3) wound around the other end of the surface of the magnetic ring (1) and corresponding to the first flat coil (2), a base plate (4) assembled on the bottom side of the magnetic ring (1) for mounting the first flat coil (2) and the second flat coil (3), and a partition plate (5) interference-fitted into the magnetic ring (1); The base plate (4) is provided with a first wire hole (41) and a second wire hole (42), the end of the first flat coil (2) is provided with a first pin (21), and the end of the second flat coil (3) is provided with a second pin (31). The first pin (21) of the first flat coil (2) passes through the first wire hole (41) and is inserted into the bottom side of the base plate (4); the second pin (31) of the second flat coil (3) passes through the second wire hole (42) and is inserted into the bottom side of the base plate (4). The magnetic ring (1) is circular or polygonal; An adhesive layer is provided between the magnetic ring (1) and the first flat coil (2) and the second flat coil (3).

2. The common-mode inductor according to claim 1, characterized in that, The magnetic ring (1) is made of nanocrystalline material or ferrite material.

3. The common-mode inductor according to claim 1, characterized in that, The base plate (4) has a first extension (43) and a second extension (44) extending from both ends. The first extension (43) and the second extension (44) are staggered to accommodate the first pin (21) and the second pin (31) respectively.

4. The common-mode inductor according to claim 1, characterized in that, The first flat coil (2) and / or the second flat coil (3) include: a coil body and an insulating adhesive covering the surface of the coil body.

5. The common-mode inductor according to claim 4, characterized in that, The coil body is made of copper.

6. The common-mode inductor according to claim 1, characterized in that, Both the base plate (4) and the partition plate (5) are made of epoxy board material.

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