Anti-interference high-low frequency transformer

Abstract

The utility model discloses an anti -interference high -low frequency transformer, including transformer main part, the bottom fixed connection of transformer main part has two insulating support blocks, the bottom of two insulating support blocks is jointly pasted with lower shield case, and the top of lower shield case is inserted with insulating ring. In the utility model, by setting three -layer composite shielding structure that comprises nanocrystalline alloy inner layer, copper foil layer and aluminum alloy layer in lower shield case and upper shield case, cooperate filled heat conducting epoxy resin and grounding assembly, utilize nanocrystalline alloy inner layer to absorb low -frequency magnetic field interference, copper foil layer reflects high -frequency electromagnetic interference, aluminum alloy layer provides structural support and heat dissipation, also through heat conducting epoxy resin enhancement structure stability and heat dissipation performance, and with the help of grounding assembly ensures good grounding to the outside magnetic field interference is effectively inhibited, avoids magnetic saturation and signal distortion, and the anti -interference ability of transformer, power transmission efficiency and long -term work reliability have been improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to an anti-interference high and low frequency transformer. Background Technology

[0002] High- and low-frequency transformers, as core components of modern electronic equipment, are capable of efficiently transmitting power for various signals and have a wide range of applications. These transformers can handle power transmission for single-frequency signals as well as narrow-frequency and wide-bandwidth signals. With the rapid evolution of switching power supply technology, high- and low-frequency transformers have gained a broader development platform and application space, and their performance and application scope have continued to expand.

[0003] A search revealed that patent CN103680848B discloses a high- and low-frequency transformer, comprising a base plate, a casing, and an iron core. The iron core is disposed on the base plate and includes an annular magnetic yoke and a core post. The casing covers the iron core, and a core post insertion hole is disposed on the top of the casing, which corresponds to the inner hole of the annular magnetic yoke. Multiple coils are wound on the outer side of the core post, and adjacent coils are separated by an insulating tape layer. The core post with coils is inserted into the core post insertion hole, and its two end faces are abutted against the inner sidewall of the annular magnetic yoke. The core post is made of NiCuZn ferrite nanocrystalline laminates, and the annular magnetic yoke is made of iron-based amorphous alloy laminates.

[0004] However, the aforementioned device has the following drawbacks: The high- and low-frequency transformer uses a high-permeability material (NiCuZn ferrite nanocrystals + iron-based amorphous alloy), which, while improving magnetic performance, also makes it more sensitive to external magnetic fields. When the transformer is near high-current conductors, motors, or switching power supplies, or other strong interference sources, the external alternating magnetic field easily couples into the core, leading to a nonlinear decrease in permeability (magnetic saturation effect), signal transmission distortion (such as power frequency noise or high-frequency harmonic aliasing), and increased iron losses (increased temperature rise), severely affecting the transformer's power transmission efficiency and long-term reliability. Although the high- and low-frequency transformer incorporates a ring-shaped magnetic yoke structure to reduce leakage flux, its passive shielding capability against external magnetic fields is insufficient, especially in the high-frequency band where it is difficult to effectively suppress electromagnetic interference (EMI). Therefore, further improvements are needed. To this end, we propose an anti-interference high- and low-frequency transformer. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an anti-interference high and low frequency transformer.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an anti-interference high and low frequency transformer, comprising a transformer body, two insulating support blocks fixedly connected to the bottom of the transformer body, a lower shielding cover being attached to the bottom of the two insulating support blocks, an insulating ring being inserted into the top of the lower shielding cover, and the pins on both sides of the transformer body being provided through the insulating ring, an upper shielding cover being sleeved on the top of the outer surface of the insulating ring, and a grounding component being fixedly installed on one side of the outer surface of both the lower shielding cover and the upper shielding cover;

[0007] The inner sides of the upper shield, lower shield, and insulating ring are all filled with thermally conductive epoxy resin.

[0008] Both the upper and lower shields include a nanocrystalline alloy inner layer, the outer surface of which is provided with a copper foil layer, and the outer surface of which is provided with an aluminum alloy layer.

[0009] Furthermore, an insulating base plate is fixedly connected to the bottom of the lower shield.

[0010] Furthermore, multiple through holes are provided on both sides of the top of the insulating ring, and the through holes are matched with the pins on the transformer body.

[0011] Furthermore, heat dissipation fins are provided on both sides of the outer surface of the top single aluminum alloy layer.

[0012] Furthermore, both grounding components include metal sheets, which are fixedly connected to the aluminum alloy layer, and the top of the metal sheet has a threaded hole extending to the bottom.

[0013] Furthermore, a first two-component epoxy conductive silver paste is filled between the inner layer of the nanocrystalline alloy and the copper foil layer.

[0014] Furthermore, a second two-component epoxy conductive silver paste is filled between the copper foil layer and the aluminum alloy layer.

[0015] The beneficial effects of this utility model are:

[0016] In use, this invention employs a three-layer composite shielding structure consisting of a nanocrystalline alloy inner layer, a copper foil layer, and an aluminum alloy layer within the lower and upper shielding covers. This, combined with the filling of thermally conductive epoxy resin and grounding components, effectively suppresses external magnetic field interference, avoids magnetic saturation and signal distortion, and significantly improves the transformer's anti-interference capability, power transmission efficiency, and long-term operational reliability. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments 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.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a side view of the structure of this utility model;

[0020] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 4 This is a schematic diagram of the upper and lower shielding covers of this utility model.

[0022] The attached figures are labeled as follows:

[0023] 1. Transformer body; 2. Lower shielding cover; 3. Insulating base plate; 4. Insulating ring; 5. Threaded hole; 6. Metal sheet; 7. Upper shielding cover; 8. Heat dissipation fins; 9. Through hole; 10. Thermally conductive epoxy resin; 11. Insulating support block; 12. Aluminum alloy layer; 13. Nanocrystalline alloy inner layer; 14. First two-component epoxy conductive silver paste; 15. Copper foil layer; 16. Second two-component epoxy conductive silver paste. Detailed Implementation

[0024] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figures 1-4 As shown, an anti-interference high and low frequency transformer is disclosed, including a transformer body 1. Two insulating support blocks 11 are fixedly connected to the bottom of the transformer body 1. A lower shielding cover 2 is attached to the bottom of the two insulating support blocks 11. An insulating ring 4 is inserted into the top of the lower shielding cover 2. The insulating ring 4 is an injection-molded part of engineering plastic. The pins on both sides of the transformer body 1 are set through the insulating ring 4. Multiple through holes 9 are opened on the top two sides of the insulating ring 4. The through holes 9 match the pins on the upper side of the transformer body 1. An upper shielding cover 7 is sleeved on the top of the outer surface of the insulating ring 4.

[0026] The inner sides of the upper shield 7, the lower shield 2, and the insulating ring 4 are all filled with thermally conductive epoxy resin 10. The thermally conductive epoxy resin 10 uses bisphenol A epoxy resin as the base material and adds modified thermally conductive fillers (such as boron nitride, alumina, etc.) to improve thermal conductivity.

[0027] An insulating base plate 3 is fixedly connected to the bottom of the lower shield 2. The insulating base plate 3 is made of fiberglass reinforced epoxy board.

[0028] Both the upper shield 7 and the lower shield 2 include a nanocrystalline alloy inner layer 13. The outer surface of the nanocrystalline alloy inner layer 13 is provided with a copper foil layer 15, and the outer surface of the copper foil layer 15 is provided with an aluminum alloy layer 12. A first two-component epoxy conductive silver paste 14 is filled between the nanocrystalline alloy inner layer 13 and the copper foil layer 15, and a second two-component epoxy conductive silver paste 16 is filled between the copper foil layer 15 and the aluminum alloy layer 12. The nanocrystalline alloy inner layer 13 uses Fe-Si-B system nanocrystalline tape. The two-component epoxy conductive silver paste is a conductive adhesive made by mixing silver filler and epoxy resin in a certain proportion, and has high conductivity and high thermal conductivity.

[0029] Heat dissipation fins 8 are provided on both sides of the outer surface of the single aluminum alloy layer 12 at the top.

[0030] Grounding components are fixedly installed on one side of the outer surface of both the lower shield 2 and the upper shield 7. Both grounding components include a metal sheet 6, and the metal sheet 6 is fixedly connected to the aluminum alloy layer 12. A threaded hole 5 extending through to the bottom is opened on the top of the metal sheet 6.

[0031] Working principle: The insulating ring 4, the upper shielding cover 7, and the lower shielding cover 2 together constitute a complete electromagnetic shielding structure.

[0032] Both the upper shield 7 and the lower shield 2 employ a three-layer composite structure: the innermost layer is a nanocrystalline alloy inner layer 13, the middle layer is a copper foil layer 15, and the outermost layer is an aluminum alloy layer 12. The nanocrystalline alloy inner layer 13 and the copper foil layer 15 are bonded and fixed together by a first two-component epoxy conductive silver adhesive 14, and the copper foil layer 15 and the aluminum alloy layer 12 are bonded and fixed together by a second two-component epoxy conductive silver adhesive 16. This composite shielding structure effectively absorbs low-frequency magnetic field interference through the nanocrystalline alloy inner layer 13, reflects high-frequency electromagnetic interference through the copper foil layer 15, and provides structural support and auxiliary heat dissipation through the aluminum alloy layer 12.

[0033] The metal sheet 6 and the threaded hole 5 can be connected to the existing grounding wire, which is then connected to the device's grounding system to ensure that the shielding layer has a good grounding path.

[0034] The cavity between the upper shield 7 and the lower shield 2, as well as the inner cavity of the insulating ring 4, is filled with thermally conductive epoxy resin 10, which serves both to fix the structure and to improve heat dissipation.

[0035] The insulating base plate 3 provides electrical isolation and mechanical support.

[0036] Heat dissipation fins 8 are provided on both sides of the outer surface of the aluminum alloy layer 12 of the upper shield 7 to further enhance the heat dissipation effect.

[0037] The entire transformer achieves excellent anti-interference and heat dissipation performance through a multi-layer shielding structure and thermal conductive design.

[0038] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An anti-interference high and low frequency transformer, comprising a transformer body (1), characterized in that: Two insulating support blocks (11) are fixedly connected to the bottom of the transformer body (1). The bottom of the two insulating support blocks (11) is fitted with a lower shield (2). An insulating ring (4) is inserted into the top of the lower shield (2). The pins on both sides of the transformer body (1) are set through the insulating ring (4). An upper shield (7) is sleeved on the top of the outer surface of the insulating ring (4). Grounding components are fixedly installed on one side of the outer surface of the lower shield (2) and the upper shield (7). The inner sides of the upper shield (7), the lower shield (2), and the insulating ring (4) are all filled with thermally conductive epoxy resin (10); Both the upper shield (7) and the lower shield (2) include a nanocrystalline alloy inner layer (13), the outer surface of the nanocrystalline alloy inner layer (13) is provided with a copper foil layer (15), and the outer surface of the copper foil layer (15) is provided with an aluminum alloy layer (12).

2. The anti-interference high and low frequency transformer according to claim 1, characterized in that: An insulating base plate (3) is fixedly connected to the bottom of the lower shield (2).

3. The anti-interference high and low frequency transformer according to claim 1, characterized in that: Multiple through holes (9) are provided on both sides of the top of the insulating ring (4), and the through holes (9) are matched with the pins on the transformer body (1).

4. The anti-interference high and low frequency transformer according to claim 1, characterized in that: Heat dissipation fins (8) are provided on both sides of the outer surface of the top single aluminum alloy layer (12).

5. The anti-interference high and low frequency transformer according to claim 1, characterized in that: Both grounding components include a metal sheet (6), and the metal sheet (6) is fixedly connected to the aluminum alloy layer (12). The top of the metal sheet (6) has a threaded hole (5) that extends through to the bottom.

6. The anti-interference high and low frequency transformer according to claim 1, characterized in that: The space between the nanocrystalline alloy inner layer (13) and the copper foil layer (15) is filled with a first two-component epoxy conductive silver paste (14).

7. The anti-interference high and low frequency transformer according to claim 1, characterized in that: A second two-component epoxy conductive silver paste (16) is filled between the copper foil layer (15) and the aluminum alloy layer (12).

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