A high frequency planar transformer

Abstract

This utility model discloses a high-frequency planar transformer, including a transformer body, a planar winding, a cover, and a magnetic core. The planar winding is internally arranged in the transformer body and is formed by stacking PCB boards sequentially. A magnetic core is located at the center of the outer surface of the planar winding, and the magnetic core includes a lower base and an upper cover. The planar winding passes between the lower base and the upper cover, and pins are provided on both sides of the bottom of the planar winding, extending to the outside of the transformer body. Side posts are provided on both sides of the top of the lower base, and a center post is located at the center of the top of the lower base. A pre-drilled hole is provided at the center of the planar winding. This utility model, by installing the transformer body, planar winding, and magnetic core, ensures tight contact between the magnetic core and the winding, resulting in low leakage inductance. The upper cover and lower base are fixed with adhesive, leading to more uniform stress distribution and reducing the risk of magnetic core cracking.

Description

Technical Field

[0001] This utility model relates to the field of high-frequency planar transformer technology, specifically a high-frequency planar transformer. Background Technology

[0002] A high-frequency planar transformer is a type of transformer specifically designed for high-frequency power electronics applications. Its core features include high power density, low loss, and excellent high-frequency characteristics achieved through planar windings and a special magnetic core structure.

[0003] The structure of a high-frequency planar transformer mainly consists of a magnetic core and planar windings. The magnetic cores of existing high-frequency planar transformers are mostly integrated structures. Integrated magnetic cores require laser cutting of the air gap, which has low precision and the air gap position is fixed, which may lead to increased leakage inductance. Utility Model Content

[0004] The purpose of this invention is to provide a high-frequency planar transformer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-frequency planar transformer, comprising a transformer body, a planar winding, a cover, and a magnetic core. The planar winding is disposed inside the transformer body and is formed by stacking PCB boards sequentially. A magnetic core is disposed at the center of the outer side of the planar winding, and the magnetic core includes a lower base and an upper cover. The planar winding passes between the lower base and the upper cover, and pins are disposed on both sides of the bottom of the planar winding, extending to the outside of the transformer body. Side pillars are disposed on both sides of the top of the lower base, and a central pillar is disposed at the center of the top of the lower base. A reserved hole is opened at the center of the planar winding, and a cover is disposed on the top of the transformer body.

[0006] Preferably, a support member is provided at each of the four corners of the bottom of the cover, and a fixing clip is provided on one side of each support member via a pivot.

[0007] Preferably, both ends of the transformer body are provided with slots that match the fixing clips, and one side of the fixing clips is connected to the support member by a return spring.

[0008] Preferably, heat dissipation fins are evenly distributed on the outer side of the transformer body, and the heat dissipation fins are all made of copper alloy.

[0009] Preferably, the cross-section of the central column is trapezoidal, and the central column passes through a pre-drilled hole.

[0010] Preferably, positioning posts are uniformly arranged at the bottom of the transformer body, and positioning grooves matching the positioning posts are uniformly opened on the bottom surface of the planar winding.

[0011] Preferably, each of the positioning grooves has a buffer pad embedded inside, and the buffer pads are all made of silicone material.

[0012] Preferably, the side posts are symmetrically distributed about the center post, and the side posts are uniformly coated with flexible ferrite adhesive on the side closest to the planar winding.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This high-frequency planar transformer consists of a transformer body, a planar winding, and a magnetic core. The planar winding is made of stacked PCB boards, and the magnetic core is composed of a lower base and an upper cover. The lower base and the upper cover sandwich the planar winding in the middle. The upper cover and the lower base are fixed with adhesive to form a closed magnetic circuit. The magnetic core and the winding are in close contact, resulting in low leakage inductance. The upper cover and the lower base are fixed with adhesive, resulting in more uniform stress distribution and reducing the risk of magnetic core cracking. Moreover, the magnetic core is in direct contact with the PCB board, and heat can be directly conducted to the outside, resulting in better heat dissipation. A central column is set at the center of the lower base, and a reserved hole is opened at the center of the planar winding. The central column passes through the reserved hole. At the same time, the central column has a trapezoidal structure (narrower at the top and wider at the bottom), which increases the contact area between the planar winding and the magnetic core, so that the magnetic lines of force are concentrated through the center of the winding, reducing magnetic leakage. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a front view cross-sectional structural diagram of the present invention;

[0016] Figure 2 This is a side view of the lower base structure of this utility model;

[0017] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0018] Figure 4 For the present utility model Figure 2 Enlarged structural diagram at point B;

[0019] Figure 5 This is a top view schematic diagram of the planar winding structure of this utility model.

[0020] In the diagram: 1. Transformer body; 2. Planar winding; 3. Lower base; 4. Upper cover; 5. Cover body; 6. Heat dissipation fins; 7. Pins; 8. Center post; 9. Side post; 10. Reserved hole; 11. Flexible ferrite adhesive; 12. Support component; 13. Return spring; 14. Fixing clip; 15. Slot; 16. Shaft; 17. Positioning slot; 18. Buffer pad; 19. Positioning post; 20. Magnetic core; 21. PCB board. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0022] Please see Figure 1-5 The present invention provides an embodiment of a high-frequency planar transformer, comprising a transformer body 1, a planar winding 2, a cover 5, and a magnetic core 20. The planar winding 2 is disposed inside the transformer body 1 and is made of PCB boards 21 stacked sequentially. A magnetic core 20 is disposed at the center of the outer side of the planar winding 2, and the magnetic core 20 includes a lower base 3 and an upper cover 4. The planar winding 2 passes between the lower base 3 and the upper cover 4.

[0023] The lower base 3 and the upper cover 4 sandwich the planar winding 2 in the middle. The upper cover 4 and the lower base 3 are fixed by adhesive to form a closed magnetic circuit. The magnetic core 20 is in close contact with the planar winding 2, resulting in low leakage inductance. The upper cover 4 and the lower base 3 are fixed by adhesive, resulting in more uniform stress distribution and reducing the risk of cracking of the magnetic core 20. Moreover, the magnetic core 20 is in direct contact with the PCB board 21, and heat can be directly conducted to the outside, resulting in better heat dissipation.

[0024] Side posts 9 are provided on both sides of the top of the lower base 3, and a central post 8 is provided at the center of the top of the lower base 3. A reserved hole 10 is provided at the center of the planar winding 2.

[0025] The cross-section of the central column 8 is trapezoidal, and the central column 8 passes through the reserved hole 10, which increases the contact area between the planar winding 2 and the magnetic core 20, so that the magnetic lines of force are concentrated through the center of the winding and the leakage magnetic field is reduced.

[0026] The side posts 9 are symmetrically distributed about the center post 8, and the side posts 9 are uniformly coated with flexible ferrite glue 11 on the side closest to the planar winding 2 to fill microscopic unevenness, reduce magnetic circuit air gap caused by assembly tolerance, and improve consistency.

[0027] The bottom of the transformer body 1 is uniformly provided with positioning posts 19, and the bottom surface of the planar winding 2 is uniformly provided with positioning grooves 17 that match the positioning posts 19, which restricts the degree of freedom of the planar winding 2 in the horizontal and vertical directions, making the planar winding 2 less likely to be displaced under vibration.

[0028] Each positioning groove 17 has a buffer pad 18 embedded inside, and the buffer pad 18 is made of silicone material, which absorbs the mechanical impact between the planar winding 2 and the positioning post 19 by utilizing its elastic deformation characteristics.

[0029] Pins 7 are provided on both sides of the bottom of the planar winding 2. The pins 7 extend to the outside of the transformer body 1 for electrical connection.

[0030] The transformer body 1 is provided with a cover 5 on the top. Support members 12 are provided at the four corners of the bottom of the cover 5, and a fixing clip 14 is provided on one side of each support member 12 via a rotating shaft 16.

[0031] Both ends of the transformer body 1 have slots 15 that match the fixing clips 14. One side of the fixing clips 14 is connected to the support 12 by a return spring 13.

[0032] The cover 5 is connected to the top of the transformer body 1. When the fixing clip 14 passes through the slot 15, it is engaged in the slot 15 under the elastic action of the return spring 13, thereby making the cover 5 and the transformer body 1 engage and achieving mechanical locking between the cover 5 and the transformer body 1. Assembly can be completed by pressing vertically with one hand without the need for additional tools.

[0033] The transformer body 1 has heat dissipation fins 6 evenly distributed on its outer side, and the heat dissipation fins 6 are all made of copper alloy. The heat dissipation fins 6 increase the total heat dissipation area of ​​the transformer body 1, and together with the natural convection or forced air cooling system, the heat dissipation efficiency is improved.

[0034] Working Principle: In this embodiment, the planar winding 2 inside the transformer body 1 is made of stacked PCB boards 21. The magnetic core 20 consists of a lower base 3 and an upper cover 4. The lower base 3 and the upper cover 4 sandwich the planar winding 2 in the middle. The upper cover 4 and the lower base 3 are fixed together by adhesive to form a closed magnetic circuit. The magnetic core 20 has a tight contact with the planar winding 2, resulting in low leakage inductance. The upper cover 4 and the lower base 3 are fixed together by adhesive, resulting in more uniform stress distribution and reducing the risk of cracking of the magnetic core 20. Moreover, the magnetic core 20 is in direct contact with the PCB board 21, and heat can be directly conducted to the outside, resulting in good heat dissipation. A middle... The center post 8 has a reserved hole 10 at the center of the planar winding 2. The center post 8 passes through the reserved hole 10. At the same time, the center post 8 has a trapezoidal structure (narrower at the top and wider at the bottom), which increases the contact area between the planar winding 2 and the magnetic core 20, so that the magnetic lines of force are concentrated through the center of the winding and the leakage magnetic field is reduced. Then the cover 5 is connected to the top of the transformer body 1. When the fixing clip 14 passes through the slot 15, it is locked into the slot 15 under the elastic action of the return spring 13, so that the cover 5 is locked to the transformer body 1, realizing the mechanical locking of the cover 5 and the transformer body 1. Assembly can be completed by pressing vertically with one hand without additional tools.

[0035] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0038] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-frequency planar transformer, characterized in that, The transformer body (1) includes a planar winding (2), a cover (5) and a magnetic core (20). The planar winding (2) is arranged inside the transformer body (1) and is made of PCB boards (21) stacked in sequence. A magnetic core (20) is arranged at the center of the outside of the planar winding (2). The magnetic core (20) includes a lower base (3) and an upper cover (4). The planar winding (2) passes between the lower base (3) and the upper cover (4). Pins (7) are arranged on both sides of the bottom of the planar winding (2). The pins (7) extend to the outside of the transformer body (1). Side pillars (9) are arranged on both sides of the top of the lower base (3). A center pillar (8) is arranged at the center of the top of the lower base (3). A reserved hole (10) is opened at the center of the planar winding (2). A cover (5) is arranged on the top of the transformer body (1).

2. A high-frequency planar transformer according to claim 1, characterized in that: Support members (12) are provided at the four corners of the bottom of the cover (5), and a fixing clip (14) is provided on one side of each support member (12) via a pivot (16).

3. A high-frequency planar transformer according to claim 2, characterized in that: Both ends of the transformer body (1) are provided with slots (15) that match the fixing clips (14). One side of the fixing clips (14) is connected to the support (12) by a reset spring (13).

4. A high-frequency planar transformer according to claim 1, characterized in that: The transformer body (1) has heat dissipation fins (6) evenly distributed on its outer side, and the heat dissipation fins (6) are all made of copper alloy.

5. A high-frequency planar transformer according to claim 1, characterized in that: The cross-section of the central column (8) is trapezoidal, and the central column (8) passes through the reserved hole (10).

6. A high-frequency planar transformer according to claim 1, characterized in that: The bottom of the transformer body (1) is uniformly provided with positioning posts (19), and the bottom surface of the planar winding (2) is uniformly provided with positioning grooves (17) that match the positioning posts (19).

7. A high-frequency planar transformer according to claim 6, characterized in that: Each of the positioning grooves (17) has a buffer pad (18) embedded inside, and the buffer pads (18) are all made of silicone material.

8. A high-frequency planar transformer according to claim 1, characterized in that: The side posts (9) are symmetrically distributed about the center post (8), and the side posts (9) are uniformly coated with flexible ferrite glue (11) on the side closest to the planar winding (2).

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