Full-shielding PCB transformer

Abstract

The utility model provides a full-shielding PCB transformer, and relates to the technical field of transformers, the key points of the technical scheme are that the full-shielding PCB transformer comprises a shell, a transformer main body arranged in the shell and an encapsulation layer encapsulating the transformer main body in the shell, and further comprises an iron shielding layer arranged in the shell and used for resisting electromagnetic interference and preventing magnetic leakage; an iron-based nanocrystalline shielding layer is arranged in the iron shielding layer, and the transformer is arranged in the iron-based nanocrystalline shielding layer and used for preventing magnetic leakage; a copper shielding layer is further arranged between the primary winding and the secondary winding of the transformer body, and the copper shielding layer is grounded through a wire and used for electrostatic shielding. The full-shielding PCB transformer has the advantages of effectively shielding external electromagnetic interference, preventing magnetic leakage and providing electrostatic shielding.

Description

Technical Field

[0001] This application relates to the field of transformer technology, and more specifically, to a fully shielded PCB transformer. Background Technology

[0002] Currently, PCB transformers are widely used in medical equipment (medical imaging equipment, surgical equipment); industrial control systems (robotics, automated production lines); communication equipment (such as base stations, modems, servers); precision equipment (instruments, laboratory equipment, banknote counters); high-end audio equipment (linear power supplies, Hi-Fi preamps, professional mixing consoles, high-end headphone amplifiers, high-end decoders, high-end players, reel-to-reel players, high-end CD players); automotive electronic systems, where fully shielded PCB transformers are commonly used in vehicle power systems and vehicle communication equipment; new energy equipment, including photovoltaics, wind power, energy storage, and charging piles; and rail transit, trains, and high-speed rail. The market maintains steady growth, and these fields place stringent requirements on electromagnetic interference (EMI) control to ensure equipment stability and reliability. However, most PCB transformers on the market currently employ a simple potting design, which involves placing the wound transformer into a plastic shell, extending the pins, and then potting it. While this design can fix the transformer's position on the circuit board, its actual function is limited to shortening the lead distance and fails to effectively meet the EMI immunity requirements of electronic equipment.

[0003] With the rapid development of technology, the requirements for electronic devices are becoming increasingly stringent, especially in applications sensitive to electromagnetic interference (EMI). As a core component of such equipment, power transformers are susceptible to crosstalk of pulse noise or electromagnetic interference to sensitive circuits under the influence of external EMI, thereby reducing system performance. Furthermore, the leakage magnetic field generated by the transformer itself during operation can also cause radiation and interference to surrounding EMI-sensitive circuits.

[0004] The primary function of a PCB transformer is to provide high-quality, stable, and clean voltage to various unit circuits within an equipment. Because the transformer's operating circuit is connected to multiple lines, its importance in the equipment cannot be ignored. First, the transformer must effectively isolate and shield various noise interferences from the power grid to prevent these interferences from entering sensitive circuits through the transformer's power supply path. Second, external electromagnetic interference, as well as internal MCU circuitry, RF circuitry, and FM circuitry, can all radiate wirelessly to the transformer, introducing interference signals.

[0005] The above problems urgently need to be addressed. Utility Model Content

[0006] The purpose of this application is to provide a fully shielded PCB transformer, which has the advantages of effectively shielding external electromagnetic interference, preventing magnetic leakage, and providing electrostatic shielding.

[0007] Firstly, this application provides a fully shielded PCB transformer, the technical solution of which is as follows:

[0008] The transformer includes a housing, a transformer body disposed within the housing, and a potting layer encapsulating the transformer body within the housing, and further includes:

[0009] The outer shell is provided with an iron shielding layer to resist electromagnetic interference and prevent magnetic leakage.

[0010] An iron-based nanocrystalline shielding layer is provided inside the iron shielding layer, and the transformer body is disposed inside the iron-based nanocrystalline shielding layer to prevent magnetic leakage.

[0011] A copper shielding layer is also provided between the primary winding and the secondary winding of the transformer body. The copper shielding layer is grounded through a wire for electrostatic shielding.

[0012] Furthermore, in this application, the outer shell is a cup-shaped structure with a first opening at the bottom and a first cavity inside that communicates with the first opening;

[0013] The iron shielding layer has a cup-shaped structure with a second opening at the bottom and a second cavity inside that communicates with the second opening. The iron shielding layer is disposed in the first cavity, and the outer side wall of the iron shielding layer is in contact with the inner side wall of the outer shell.

[0014] Furthermore, in this application, the iron-based nanocrystalline shielding layer has a cup-shaped structure with a third opening at the bottom and a third cavity inside that communicates with the third opening. The iron-based nanocrystalline shielding layer is disposed in the second cavity, and the outer sidewall of the iron-based nanocrystalline shielding layer is in contact with the inner sidewall of the iron shielding layer.

[0015] Furthermore, in this application, a mounting post is provided on the top of the inner wall of the outer shell extending toward the first opening, and the mounting post is provided with a mounting part at one end near the first opening.

[0016] Furthermore, in this application, the mounting part is a nut, and the mounting post has a first mounting cavity at one end near the first opening, and the nut is embedded in the first mounting cavity.

[0017] Furthermore, in this application, the mounting post is further provided with a first receiving cavity that communicates with the first mounting cavity, and the first receiving cavity extends along the extension direction of the mounting post.

[0018] Furthermore, in this application, the top of the iron shielding layer is provided with a first through hole for cooperating with the mounting post, and the top of the iron-based nanocrystalline shielding layer is provided with a second through hole for cooperating with the mounting post.

[0019] Furthermore, in this application, the iron shielding layer is made of pure iron sheet with a magnetic permeability between 1K and 2K Henry / meter.

[0020] Furthermore, in this application, the iron-based nanocrystalline shielding layer is made of iron-based nanocrystalline material with a magnetic permeability between 10K and 200K Henry / meter.

[0021] Furthermore, in this application, the potting layer is composed of epoxy resin.

[0022] As can be seen from the above, the fully shielded PCB transformer provided in this application effectively solves the problems of external electromagnetic interference, magnetic leakage and electrostatic interference through a multi-layer shielding structure, and has the advantages of effectively shielding external electromagnetic interference, preventing magnetic leakage and providing electrostatic shielding. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a fully shielded PCB transformer provided in this application.

[0024] Figure 2 A schematic diagram of the casing provided in this application.

[0025] Figure 3 This is a schematic diagram of the structure of a fully shielded PCB transformer provided in this application.

[0026] Figure 4 A cross-sectional view of the housing provided for this application.

[0027] Figure 5 This is a schematic diagram of the main body of the transformer provided in this application.

[0028] In the diagram: 100, outer casing; 200, transformer body; 300, potting layer; 400, iron shielding layer; 500, iron-based nanocrystalline shielding layer; 600, copper shielding layer; 110, first opening; 120, first cavity; 130, mounting post; 140, mounting part; 150, first mounting cavity; 160, first receiving cavity; 210, primary winding; 220, secondary winding; 410, second opening; 420, second cavity; 430, first through hole; 510, third opening; 520, third cavity; 530, second through hole. Detailed Implementation

[0029] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] There is a significant need for fully shielded PCB transformers in terms of electromagnetic interference (EMI) control. Current PCB transformers on the market mainly employ simple potting designs, which, while fixing the transformer's position, fail to effectively address the EMI immunity requirements of electronic devices. To address these issues, this application proposes a fully shielded PCB transformer that effectively resists EMI and prevents magnetic leakage through a multi-layered shielding structure.

[0032] Specifically, refer to Figures 1 to 5 This application provides a fully shielded PCB transformer, the technical solution of which is as follows:

[0033] The transformer includes a housing 100, a transformer body 200 disposed within the housing 100, and a potting layer 300 encapsulating the transformer body 200 within the housing 100. It also includes:

[0034] An iron shielding layer 400 is provided inside the outer casing 100 to resist electromagnetic interference and prevent magnetic leakage.

[0035] An iron-based nanocrystalline shielding layer 500 is provided inside the iron shielding layer 400, and the transformer body 200 is located inside the iron-based nanocrystalline shielding layer 500 to prevent magnetic leakage.

[0036] A copper shielding layer 600 is also provided between the primary winding 210 and the secondary winding 220 of the transformer body 200. The copper shielding layer 600 is grounded through a wire for electrostatic shielding.

[0037] Current PCB transformers are susceptible to external electromagnetic interference in complex electromagnetic environments, leading to performance degradation. This application effectively solves this problem by introducing a multi-layer shielding structure. First, the iron shielding layer 400 resists external electromagnetic interference and prevents magnetic leakage. Second, the iron-based nanocrystalline shielding layer 500 further enhances the anti-magnetic leakage effect. Finally, the copper shielding layer 600, through grounding, provides electrostatic shielding, ensuring that the transformer is not affected by electrostatic interference during operation.

[0038] Compared with existing technologies, this application significantly improves the transformer's electromagnetic interference resistance through a multi-layer shielding structure design. The combined use of the iron shielding layer 400 and the iron-based nanocrystalline shielding layer 500 not only effectively prevents magnetic leakage but also enhances the overall shielding effect of the transformer. The introduction of the copper shielding layer 600, through grounding treatment, further improves the transformer's electrostatic shielding performance.

[0039] In practical applications, the fully shielded PCB transformer of this application effectively solves the problems of electromagnetic interference and magnetic leakage through its multi-layer shielding structure. The iron shielding layer 400 provides initial electromagnetic interference protection, the iron-based nanocrystalline shielding layer 500 further enhances the anti-magnetic leakage effect, and the copper shielding layer 600 ensures electrostatic shielding through grounding. Therefore, this application has significant advantages in ensuring equipment stability and reliability.

[0040] Furthermore, in this application, the outer shell 100 has a cup-shaped structure, with a first opening 110 at the bottom and a first cavity 120 inside that communicates with the first opening 110;

[0041] The iron shielding layer 400 has a cup-shaped structure with a second opening 410 at the bottom and a second cavity 420 inside that communicates with the second opening 410. The iron shielding layer 400 is disposed in the first cavity 120, and the outer side wall of the iron shielding layer 400 is in contact with the inner side wall of the outer shell 100.

[0042] This design primarily addresses the shortcomings of existing PCB transformers in terms of electromagnetic interference resistance and magnetic leakage prevention. By designing the outer casing 100 and the iron shielding layer 400 into cup-shaped structures, with openings and cavities at their bottoms, the iron shielding layer 400 can be tightly embedded within the outer casing 100, effectively resisting external electromagnetic interference and reducing magnetic leakage. This design not only improves the transformer's anti-interference capability but also enhances its structural stability.

[0043] Specifically, the cup-shaped structure of the outer casing 100 and the iron shielding layer 400 allows the shielding layer to completely enclose the transformer body 200, thus providing all-around electromagnetic shielding. The first opening 110 and the second opening 410 facilitate the installation and fixation of the transformer, while ensuring tight contact between the iron shielding layer 400 and the outer casing 100. In addition, the outer sidewall of the iron shielding layer 400 contacts and fits with the inner sidewall of the outer casing 100, further enhancing the shielding effect and structural stability.

[0044] Compared with existing technologies, this application designs the outer casing 100 and the iron shielding layer 400 into a cup-shaped structure, and provides a second opening 410 and a second cavity 420, allowing the iron shielding layer 400 to cooperate with the outer casing 100, thereby effectively resisting external electromagnetic interference, reducing magnetic leakage, and improving the transformer's anti-interference capability and structural stability. Therefore, this application can meet the electromagnetic interference resistance requirements of electronic equipment while ensuring the efficient and stable operation of the transformer.

[0045] In some other embodiments, a gap may also be left between the iron shielding layer 400 and the outer shell 100.

[0046] Furthermore, in this application, the iron-based nanocrystalline shielding layer 500 has a cup-shaped structure with a third opening 510 at its bottom and a third cavity 520 communicating with the third opening 510 inside. The iron-based nanocrystalline shielding layer 500 is disposed in the second cavity 420, and the outer sidewall of the iron-based nanocrystalline shielding layer 500 is in contact with the inner sidewall of the iron shielding layer 400.

[0047] The technical solution of this application further enhances the shielding effect of the transformer, especially the protection against magnetic leakage, by setting an iron-based nanocrystalline shielding layer 500 inside the iron shielding layer 400. The iron-based nanocrystalline shielding layer 500 adopts a cup-shaped structure design, which allows it to fit with the inner side of the iron shielding layer 400, ensuring good contact and fit between the iron-based nanocrystalline shielding layer 500 and the iron shielding layer 400, thereby effectively reducing magnetic leakage.

[0048] The cup-shaped structure design of the iron-based nanocrystalline shielding layer 500 can be achieved in various ways, such as by using an integral molding process, or by processing the iron-based nanocrystalline material into sheets and then assembling them into a cup-shaped structure. Furthermore, the material selection for the iron-based nanocrystalline shielding layer 500 can be adjusted according to specific needs; for example, iron-based nanocrystalline materials with different magnetic permeabilities can be selected to meet the shielding requirements of different application scenarios.

[0049] This application effectively solves the problem of poor shielding effect in the prior art by adding an iron-based nanocrystalline shielding layer 500 within the iron shielding layer 400. The addition of the iron-based nanocrystalline shielding layer 500 not only enhances the transformer's anti-magnetic interference capability but also, through a reasonable structural design, ensures the coordination between the iron-based nanocrystalline shielding layer 500 and the iron shielding layer 400, thereby further improving the overall performance of the transformer. Compared with the prior art, the technical solution of this application can better meet the stringent requirements for electromagnetic interference control, ensuring the stability and reliability of the equipment.

[0050] In addition, in some embodiments, the cup-shaped iron-based nanocrystalline shielding layer 500 may include an annular crystal strip and a wafer located above the crystal strip, and the crystal strip and the wafer may be a separate structure.

[0051] In addition, in some embodiments, a gap may be left between the iron-based nanocrystalline shielding layer 500 and the iron shielding layer 400.

[0052] Furthermore, referring to Figure 2 , Figure 3 as well as Figure 4 In this application, a mounting post 130 is provided on the top of the inner wall of the outer casing 100 extending toward the first opening 110, and a mounting part 140 is provided on the end of the mounting post 130 near the first opening 110.

[0053] By extending a mounting post 130 to the top of the inner wall of the outer casing 100, and providing a mounting portion 140 at the end of the mounting post 130 near the first opening 110, the transformer body 200 can be better fixed and installed, facilitating the overall installation of the transformer with the external structure. This design effectively prevents the transformer from shifting position due to vibration or other external forces during transportation and use, thereby improving the reliability and service life of the transformer.

[0054] Specifically, the mounting post 130 can be manufactured integrally with the housing 100 to ensure its strength and stability. The mounting part 140 can be designed as a nut or other suitable fixing structure to facilitate the installation and removal of the transformer body 200. In practical applications, the size and shape of the mounting post 130 and the mounting part 140 can be adjusted according to the specific dimensions of the transformer body 200 and the design of the housing 100 to ensure optimal fit.

[0055] Therefore, the technical solution of this application effectively solves the problem of how to install the transformer by extending the mounting post 130 from the top of the inner wall of the outer casing 100 and providing a mounting part 140 at the end of the mounting post 130 near the first opening 110, thereby improving the stability and reliability of the transformer. Compared with the prior art, the technical solution of this application has the advantages of simple structure, convenient installation, and high stability.

[0056] In addition, a PIN pin can be provided on the outer casing 100 for connection with the external structure. The transformer body 200 is a ring structure, and a temperature sensor or fuse is provided inside the ring structure to detect the temperature and prevent it from getting too hot.

[0057] Furthermore, in this application, the mounting part 140 is a nut, and the mounting post 130 has a first mounting cavity 150 at one end near the first opening 110, and the nut is embedded in the first mounting cavity 150.

[0058] The technical solution of this application mainly solves the problem of fixing the transformer during installation, especially the problem of fixing it within the casing 100. By setting a first mounting cavity 150 on the mounting post 130 and embedding a nut in the first mounting cavity 150, the transformer can be connected and fixed to the external structure, preventing the transformer from shifting due to vibration or external force during use, thereby improving the stability and reliability of the transformer.

[0059] Specifically, the mounting post 130 has a first mounting cavity 150 at one end near the first opening 110, and a nut is embedded in this cavity. This design ensures that the nut is tightly engaged with the mounting post 130, providing a stable fixing point. The mounting post 130 can further extend to the bottom of the housing 100. In addition, the nut can be embedded in various ways, such as by adhesive, snap-fit, or mechanical embedding, to ensure the stability of the nut within the mounting post 130.

[0060] Specifically, the mounting part 140 is a nut. During installation, the bolt is passed through the external structure and then connected to the nut. The bolt and nut are then connected by tightening the bolt, thereby fixing the transformer to the external structure. In this process, only the bolt needs to be rotated to complete the installation, without rotating the entire transformer, which makes installation convenient.

[0061] Furthermore, in this application, the mounting post 130 is also provided with a first receiving cavity 160 that communicates with the first mounting cavity 150, and the first receiving cavity 160 extends along the extending direction of the mounting post 130.

[0062] The technical solution of this application solves the space limitation problem that may be encountered during the installation of the transformer by setting a first receiving cavity 160 communicating with the first mounting cavity 150 inside the mounting column 130. The setting of the first receiving cavity 160 allows for a larger space inside the mounting column 130, which can accommodate bolts that are connected and mated with nuts.

[0063] The first receiving cavity 160 can be implemented in various ways. For example, it can be machined to create a through cavity within the mounting post 130, or the cavity can be pre-formed during the manufacturing process of the mounting post 130. Specifically, the size and shape of the first receiving cavity 160 can be adjusted according to actual needs to ensure that it can accommodate bolts that mate with nuts. Furthermore, the material and structure of the first receiving cavity 160 should possess sufficient strength and stability to ensure the reliability of the transformer during use.

[0064] This application effectively solves the problem of insufficient transformer installation space in the prior art by setting a first receiving cavity 160 inside the mounting column 130, thereby improving the convenience and flexibility of transformer installation and enhancing the overall performance and applicability of the transformer.

[0065] Furthermore, in this application, the top of the iron shielding layer 400 is provided with a first through hole 430 for cooperating with the mounting post 130, and the top of the iron-based nanocrystalline shielding layer 500 is provided with a second through hole 530 for cooperating with the mounting post 130.

[0066] This application achieves a more robust structural design by creating through holes in the top of the iron shielding layer 400 and the iron-based nanocrystalline shielding layer 500, allowing them to mate with the mounting post 130. Specifically, the top of the iron shielding layer 400 has a first through hole 430, and the top of the iron-based nanocrystalline shielding layer 500 has a second through hole 530. These second through holes 530 can mate with the mounting post 130, allowing the shielding structures to be better fixed together, preventing displacement or loosening during use. In addition, the first through hole 430 and the second through hole 530 can also avoid the mounting post 130.

[0067] By providing the first through hole 430 and the second through hole 530 in conjunction with the mounting post 130, the shielding layer can be securely fixed inside the transformer, thereby improving the transformer's electromagnetic interference resistance. Therefore, the embodiments of this application not only enhance the fixing effect of the shielding layer but also further improve the overall stability and reliability of the transformer.

[0068] Furthermore, in this application, the iron shielding layer 400 is made of pure iron sheet with a magnetic permeability between 1K and 2K Henry / meter.

[0069] The iron shielding layer 400 is designed to effectively resist electromagnetic interference and prevent magnetic leakage. By using pure iron sheets with a magnetic permeability between 1K and 2K Henry / meter, the iron shielding layer 400 can be ensured to have good magnetic permeability, thereby effectively shielding external electromagnetic interference and reducing its impact on the transformer body 200.

[0070] Specifically, the design and manufacturing of the iron shielding layer 400 needs to consider the following aspects: First, the selection of pure iron sheets needs to meet the requirement of a magnetic permeability between 1K and 2K Henry / meter to ensure the shielding effect. Second, the thickness and shape of the iron shielding layer 400 also need to be optimized according to the actual application scenario to achieve the best shielding effect. Finally, the iron shielding layer 400 needs to fit tightly with the outer shell 100 and the iron-based nanocrystalline shielding layer 500 to ensure the stability and reliability of the overall structure.

[0071] This application effectively improves the transformer's electromagnetic interference resistance by using an iron shielding layer 400 made of pure iron sheets, reducing the radiation and interference of the leakage magnetic field generated by the transformer during operation to surrounding electromagnetically sensitive lines. Compared with existing technologies, the technical solution of this application can better meet the anti-interference needs of electronic equipment and improve the stability and reliability of the equipment.

[0072] Furthermore, in this application, the iron-based nanocrystalline shielding layer 500 is made of iron-based nanocrystalline material with a magnetic permeability between 10K and 200K Henry / meter.

[0073] The iron-based nanocrystalline shielding layer 500 is designed to improve the transformer's anti-interference performance. Iron-based nanocrystals have high magnetic permeability, which can effectively shield and absorb external electromagnetic interference, reducing the impact of leakage magnetic fields generated by the transformer during operation on surrounding equipment. By setting the iron-based nanocrystalline shielding layer 500 on the outside of the transformer body 200, the propagation path of electromagnetic interference can be significantly reduced, thereby improving the stability and reliability of the equipment.

[0074] The iron-based nanocrystalline shielding layer 500 can be achieved in various ways, such as by winding iron-based nanocrystalline strips or by pressing iron-based nanocrystalline powder. Regardless of the method used, the key is to ensure the continuity and integrity of the iron-based nanocrystalline shielding layer 500 to guarantee its shielding effect. As a preferred embodiment, the iron-based nanocrystalline shielding layer 500 can have its magnetic permeability further improved through a heat treatment process.

[0075] By employing an iron-based nanocrystalline shielding layer 500, the fully shielded PCB transformer provided in this application effectively solves the electromagnetic interference problem existing in the prior art. Compared with traditional potting designs, this application, through a multi-layer shielding structure, especially the application of the iron-based nanocrystalline shielding layer 500, greatly improves the transformer's anti-interference capability and ensures stable operation of the equipment in complex electromagnetic environments.

[0076] Among the aforementioned technical solutions, the iron shielding layer 400, made of pure iron sheets with a permeability between 1K and 2K Henry / meter, effectively resists electromagnetic and magnetic field interference, reducing electromagnetic interference by up to 30% and preventing magnetic leakage. The iron-based nanocrystalline shielding layer 500, made of iron-based nanocrystals with a permeability between 10K and 200K Henry / meter, exhibits superior magnetic leakage protection performance, increasing the magnetic leakage suppression effect to over 60%. By overlapping and arranging cast iron sheets and iron-based nanocrystals around the transformer, an enhanced magnetic leakage shielding effect is achieved, reducing magnetic leakage to over 80%.

[0077] Furthermore, in this application, the potting layer 300 is composed of epoxy resin.

[0078] The potting layer 300 is primarily used to provide mechanical protection and electrical insulation, effectively preventing the external environment from affecting the transformer body 200. Epoxy resin, as the potting material, possesses excellent electrical insulation properties, chemical corrosion resistance, and mechanical strength, maintaining stable performance under various harsh environments. The high viscosity and fluidity of epoxy resin allow it to completely fill the gap between the transformer body 200 and the outer casing 100, forming a continuous sealing layer, thereby further improving the transformer's reliability and lifespan.

[0079] Specifically, a plastic shell 100 for a PCB transformer can be designed first. Then, a cup-shaped structure made of pure iron can be used as an iron shielding layer 400, which is sized to fit into the first cavity 120. Next, iron-based nanocrystals can also be prefabricated into a cup-shaped structure as an iron-based nanocrystal shielding layer 500 and placed in the second cavity 420. Finally, the transformer can be placed in the third cavity 520 and then encapsulated with epoxy resin. This process can achieve a PCB transformer with multiple shielding effects.

[0080] By using epoxy resin as the potting material, the fully shielded PCB transformer of this application exhibits excellent electromagnetic interference protection while also improving the transformer's mechanical strength and weather resistance. Compared to traditional simple potting designs, the technical solution of this application can more effectively meet the stringent electromagnetic interference requirements of electronic equipment, ensuring the stability and reliability of the equipment.

[0081] It is worth noting that, Figure 1 The potting layer 300 shown in the diagram is for illustrative purposes only. In reality, the potting layer 300, which is composed of epoxy resin, can penetrate into all the gaps within the first cavity 120.

[0082] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A fully shielded PCB transformer, comprising a housing (100), a transformer body (200) disposed within the housing (100), and a potting layer (300) encapsulating the transformer body (200) within the housing (100), characterized in that, Also includes: An iron shielding layer (400) is provided inside the outer shell (100) to resist electromagnetic interference and prevent magnetic leakage; An iron-based nanocrystalline shielding layer (500) is provided inside the iron shielding layer (400), and the transformer body (200) is disposed inside the iron-based nanocrystalline shielding layer (500) for preventing magnetic leakage; A copper shielding layer (600) is also provided between the primary winding (210) and the secondary winding (220) of the transformer body (200). The copper shielding layer (600) is grounded through a wire for electrostatic shielding.

2. The fully shielded PCB transformer according to claim 1, characterized in that, The outer shell (100) has a cup-shaped structure with a first opening (110) at the bottom and a first cavity (120) inside that communicates with the first opening (110). The iron shielding layer (400) has a cup-shaped structure with a second opening (410) at its bottom and a second cavity (420) inside that communicates with the second opening (410). The iron shielding layer (400) is disposed in the first cavity (120), and the outer sidewall of the iron shielding layer (400) is in contact with the inner sidewall of the outer shell (100).

3. A fully shielded PCB transformer according to claim 2, characterized in that, The iron-based nanocrystalline shielding layer (500) has a cup-shaped structure with a third opening (510) at its bottom and a third cavity (520) inside that communicates with the third opening (510). The iron-based nanocrystalline shielding layer (500) is disposed in the second cavity (420), and the outer sidewall of the iron-based nanocrystalline shielding layer (500) is in contact with the inner sidewall of the iron shielding layer (400).

4. A fully shielded PCB transformer according to claim 3, characterized in that, A mounting post (130) is provided on the top of the inner wall of the outer shell (100) extending toward the first opening (110), and a mounting part (140) is provided on the end of the mounting post (130) near the first opening (110).

5. A fully shielded PCB transformer according to claim 4, characterized in that, The mounting part (140) is a nut, and the mounting post (130) has a first mounting cavity (150) at one end near the first opening (110), and the nut is embedded in the first mounting cavity (150).

6. A fully shielded PCB transformer according to claim 5, characterized in that, The mounting post (130) is further provided with a first receiving cavity (160) that communicates with the first mounting cavity (150), and the first receiving cavity (160) extends along the extension direction of the mounting post (130).

7. A fully shielded PCB transformer according to claim 4, characterized in that, The top of the iron shielding layer (400) is provided with a first through hole (430) for cooperating with the mounting post (130), and the top of the iron-based nanocrystalline shielding layer (500) is provided with a second through hole (530) for cooperating with the mounting post (130).

8. A fully shielded PCB transformer according to claim 1, characterized in that, The iron shielding layer (400) is made of pure iron sheet with a magnetic permeability between 1K and 2K Henry / meter.

9. A fully shielded PCB transformer according to claim 1, characterized in that, The iron-based nanocrystalline shielding layer (500) is made of iron-based nanocrystals and has a magnetic permeability between 10K and 200K Henry / meter.

10. A fully shielded PCB transformer according to claim 1, characterized in that, The potting layer (300) is composed of epoxy resin.

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