A planar transformer

Abstract

This invention relates to the field of planar transformer technology, and in particular to a planar transformer, comprising a magnetic core, a winding assembly, the winding assembly including a primary winding and a secondary winding, an input terminal and an output terminal, an insulating partition, and a fixing clip, the fixing clip cooperating with a fixing slot on the magnetic core for fixing the upper and lower magnetic cores together; and a contact assembly disposed within the upper magnetic core, for automatically connecting the input and output terminals to the primary and secondary windings respectively and providing a locking effect. By setting the contact assembly inside the upper magnetic core, and utilizing an elastic column, a bending rod, and a linkage transmission mechanism, the electrical connection between the primary winding and the input terminal, and between the secondary winding and the output terminal, is automatically completed during the assembly of the upper and lower magnetic cores, without the need for additional welding processes. This organically combines the mechanical assembly action and the electrical connection action of the magnetic core, achieving an integrated effect of "assembly equals connection".

Description

Technical Field

[0001] This invention relates to the field of planar transformer technology, and more particularly to a planar transformer. Background Technology

[0002] Planar transformers are high-frequency power transformers that employ flat windings and magnetic core structures. They are widely used in power electronic equipment such as switching power supplies, communication power supplies, and new energy converters. Compared with traditional wound transformers, planar transformers have advantages such as low leakage inductance, low skin effect loss, high power density, and good heat dissipation performance, and have become the mainstream technical solution for high-frequency and high-power applications.

[0003] The China Patent Network published a patent with publication number CN120854124A entitled "A High-Frequency Small Planar Transformer". In this patent, the secondary winding or primary winding is a welded pin. This type of pin is mainly used in mature planar transformer structures. Since there is no need to replace the winding, this type of method is better.

[0004] When used in the laboratory, when researchers need to adjust the specific number of turns of the planar transformer, they need to repeatedly replace the PCB windings with different numbers of turns. The soldering method makes it difficult to replace and adjust the various PCB windings, which is not conducive to the use effect of the planar transformer during the adjustment. Therefore, a planar transformer is needed to facilitate the adjustment and research of the researchers. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the aforementioned problem of inconvenient debugging of planar transformers, this invention is proposed.

[0007] Therefore, the object of this invention is to provide a planar transformer.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a planar transformer, comprising a magnetic core, wherein the magnetic core comprises an upper magnetic core and a lower magnetic core; The winding assembly includes a primary winding and a secondary winding. The primary winding has 4 pieces, and the secondary winding has 8 pieces. The primary windings are connected by cylindrical terminals, and the secondary windings are connected by rectangular windings. The device includes an input terminal and an output terminal, wherein the primary winding is sleeved on the input terminal and the secondary winding is sleeved on the output terminal. Insulating partitions are laid between each winding to prevent short circuits between adjacent winding layers; A fixing buckle is provided, which cooperates with a fixing slot on the magnetic core component to fix the upper magnetic core and the lower magnetic core in a fixed connection. A contact assembly is disposed within the upper magnetic core, which enables the input terminal and the output terminal to automatically connect with the primary winding and the secondary winding respectively, and has a locking effect.

[0009] In a preferred embodiment of the planar transformer of the present invention, the contact assembly includes an elastic post, which is embedded inside the upper magnetic core; A fixed spring is mounted on the embedded end of the elastic column; A bending rod is installed at the embedded end of the elastic column, and the bending rod extends toward the input terminal and the output terminal respectively; An output connector is provided at the extension end of the bent rod facing the output terminal. An input connector is provided at the extension end of the bent rod facing the input terminal.

[0010] In a preferred embodiment of the planar transformer of the present invention, the output terminal connector includes: A vertical plate is disposed inside the output terminal, and the top end of the vertical plate is connected to the bent rod; A first connecting plate is installed on the outer wall of the vertical plate; A movable link, which is connected to the first connecting plate via a pin; A contact plate, wherein the contact plate is disposed within the output terminal and extends beyond the outside of the output terminal; The second connecting plate is installed on the inner wall of the contact plate, and the second connecting plate is movably connected to the movable connecting rod by a pin.

[0011] In a preferred embodiment of the planar transformer described in this invention, the input terminal connector includes: A vertical axis is disposed within the input terminal; A first fixing plate is installed on the outer wall of the vertical shaft; A movable rod, which is connected to the outer wall of the first fixed plate via a pin; An arc-shaped plate is disposed inside the input terminal; The second fixing plate is installed on the inner wall of the arc-shaped plate, and the second fixing plate is movably connected to the movable rod by a pin.

[0012] In a preferred embodiment of the planar transformer of the present invention, during assembly, the upper magnetic core is inverted, and each primary winding, secondary winding, and insulating partition are placed according to the arrangement. The secondary winding is synchronously sleeved on the output terminal, and the primary winding is sleeved on the input terminal. Then, the lower magnetic core is fitted onto the upper magnetic core, and the upper and lower magnetic cores are clamped together by the fixing buckle and the fixing slot.

[0013] In a preferred embodiment of the planar transformer of the present invention, when the fixing buckle connects the upper magnetic core and the lower magnetic core together, the elastic column on the upper magnetic core is passively moved by the contact of the lower magnetic core, the movement of the elastic column drives the bending rod to move, and the movement of the bending rod drives the vertical plate and the vertical shaft to move.

[0014] In a preferred embodiment of the planar transformer of the present invention, when the vertical plate moves, the contact plate is moved by the movable connecting rod, so that the contact plate makes contact with the connection hole of the secondary winding.

[0015] In a preferred embodiment of the planar transformer of the present invention, when the vertical axis moves, the movable rod drives the arc-shaped plate to move, so that the arc-shaped plate makes contact with the connection hole of the primary winding.

[0016] In a preferred embodiment of the planar transformer of the present invention, the contact assembly eliminates the need for soldering between the primary winding and the secondary winding and the input terminal and the output terminal.

[0017] Beneficial effects The technical solution provided by this invention, compared with known prior art: By setting contact components inside the upper magnetic core and utilizing elastic pillars, bending rods, and linkage transmission mechanisms, the electrical connection between the primary winding and the input terminal, and between the secondary winding and the output terminal, is automatically completed during the assembly of the upper and lower magnetic cores without the need for additional welding processes. This design organically combines the mechanical assembly and electrical connection actions of the magnetic core, achieving an integrated effect of "assembly equals connection," which effectively improves the debugging effect of the planar transformer. Until the debugging reaches the determined number of turns winding, at which point the winding specifications and quantity are determined, the determined terminals and windings can be welded, thus increasing the versatility of the planar transformer. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a planar transformer.

[0020] Figure 2 This is a schematic diagram of an inverted upper magnetic core of a planar transformer.

[0021] Figure 3 This is a schematic diagram of the interior of the upper magnetic core of a planar transformer.

[0022] Figure 4 This is a schematic diagram showing the placement of insulating partitions in a planar transformer.

[0023] Figure 5 This is a cross-sectional schematic diagram of the upper magnetic core of a planar transformer.

[0024] Figure 6 for Figure 5 Enlarged view of point A in the image.

[0025] Figure 7 for Figure 5 Enlarged view of point B in the image.

[0026] Figure 8 for Figure 5 Enlarged view of point C in the image.

[0027] Reference numerals: 1. Magnetic core; 11. Upper magnetic core; 12. Lower magnetic core; 2. Winding assembly; 21. Primary winding; 22. Secondary winding; 3. Input terminal; 4. Output terminal; 5. Insulating partition; 6. Fixing buckle; 61. Fixing slot; 7. Contact assembly; 71. Elastic post; 72. Fixing spring; 73. Bending rod; 74. Output end connector; 741. Vertical plate; 742. First connecting plate; 743. Movable connecting rod; 744. Second connecting plate; 745. Contact plate; 75. Input end connector; 751. Vertical shaft; 752. First fixing plate; 753. Movable rod; 754. Second fixing plate; 755. Arc plate. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0031] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0032] Reference Figure 1 - Figure 8 This is one embodiment of the present invention, which provides a planar transformer. The magnetic core 1 includes an upper magnetic core 11 and a lower magnetic core 12. Both the upper magnetic core 11 and the lower magnetic core 12 are made of ferrite material with high magnetic permeability, and have good magnetic properties and mechanical strength. The mating surfaces of the upper magnetic core 11 and the lower magnetic core 12 are precision machined to ensure that the two can fit tightly together to form a complete magnetic circuit.

[0033] Specifically, the winding assembly 2 includes a primary winding 21 and a secondary winding 22. The primary winding 21 consists of four pieces made of flat copper foil or copper strip, each with a cylindrical terminal. These cylindrical terminals connect the primary windings 21 in series or parallel. The cylindrical terminal design makes the connection between the primary windings 21 more stable and facilitates uniform current distribution. The secondary winding 22 consists of eight pieces with a rectangular winding structure, connected by these rectangular windings. The rectangular winding design helps to improve the winding fill factor and reduce the size of the transformer.

[0034] Furthermore, the input terminal 3 is made of copper with good conductivity. The primary winding 21 is installed on the input terminal 3 by a sleeve connection. The outer diameter of the input terminal 3 matches the inner diameter of the primary winding 21 to ensure a tight connection. The output terminal 4 is also made of copper. The secondary winding 22 is installed on the output terminal 4 by a sleeve connection. The structure of the output terminal 4 is similar to that of the input terminal 3, but its size is designed according to the specifications of the secondary winding 22.

[0035] Furthermore, an insulating partition 5 is laid between each winding. The insulating partition 5 is made of a high-temperature resistant and high-insulation-strength material. The thickness of the insulating partition 5 is determined according to the voltage level between the windings, usually between 0.1mm and 0.5mm. The function of the insulating partition 5 is to prevent short circuits between adjacent winding layers and ensure the electrical safety of the transformer.

[0036] Furthermore, a fixing buckle 6 is disposed on the magnetic core 1 and cooperates with the fixing slot 61 on the magnetic core 1. The fixing buckle 6 is made of elastic material and has a certain elastic deformation capability. When the upper magnetic core 11 and the lower magnetic core 12 are engaged, the fixing buckle 6 is engaged in the fixing slot 61, fixing the upper magnetic core 11 and the lower magnetic core 12 together and preventing relative displacement between them during use.

[0037] Furthermore, the contact component 7 is disposed within the upper magnetic core 11, which is the core innovation of this embodiment. The function of the contact component 7 is to enable the input terminal 3 and the output terminal 4 to automatically connect with the primary winding 21 and the secondary winding 22 respectively during the assembly of the upper magnetic core 11 and the lower magnetic core 12, and to have a locking effect, thereby eliminating the need for welding.

[0038] Furthermore, the contact assembly 7 includes: an elastic post 71: embedded inside the upper magnetic core 11, made of an elastic material (such as spring steel or elastic plastic). The elastic post 71 is capable of axial displacement when subjected to external force and returns to its initial position after the external force is removed. A fixed spring 72: installed at the embedded end of the elastic post 71 to provide elastic restoring force. One end of the fixed spring 72 is connected to the elastic post 71, and the other end abuts against the inner wall of the upper magnetic core 11; a bent rod 73: installed at the embedded end of the elastic post 71, in a bent shape; the bent rod 73 extends towards the input terminal 3 and the output terminal 4 respectively, transmitting the displacement of the elastic post 71 to the input terminal connector 75 and the output terminal connector 74; the output terminal connector 74: located at the extension end of the bent rod 73 towards the output terminal 4, inside the output terminal 4; the input terminal connector 75: located at the extension end of the bent rod 73 towards the input terminal 3, inside the input terminal 3.

[0039] Further detailed structure of the output connector 74: The output connector 74 includes: a vertical plate 741, disposed within the output terminal 4, with its top end connected to a bent rod 73. The vertical plate 741 is made of insulating material and serves as support and guide; a first connecting plate 742, mounted on the outer wall of the vertical plate 741, is made of metal sheet and connected to a movable connecting rod 743 via a pin; the movable connecting rod 743 is connected to the first connecting plate 742 via a pin, forming a hinge structure; the movable connecting rod 743 can convert the linear motion of the vertical plate 741 into the swinging or linear motion of the contact plate 745; the contact plate 745, disposed within the output terminal 4 and extending beyond the output terminal 4, is made of highly conductive copper and its surface can be gold-plated or silver-plated to improve contact reliability; the position of the contact plate 745 is relative to the secondary winding 22. The connection holes correspond to the input terminal 3; the second connecting plate 744 is installed on the inner wall of the contact plate 745 and is movably connected to the movable connecting rod 743 via a pin to form a linkage transmission mechanism; the detailed structure of the input terminal connector 75 includes: a vertical shaft 751, which is disposed inside the input terminal 3 and is made of metal or high-strength plastic for transmitting motion; a first fixed plate 752, which is installed on the outer wall of the vertical shaft 751 and is connected to the movable rod 753 via a pin; the movable rod 753 is connected to the outer wall of the first fixed plate 752 via a pin to form a hinge structure; an arc-shaped plate 755, which is disposed inside the input terminal 3 and is made of elastic conductive material. The shape design of the arc-shaped plate 755 allows it to form good surface contact with the connection hole of the primary winding 21; the second fixed plate 754 is installed on the inner wall of the arc-shaped plate 755 and is movably connected to the movable rod 753 via a pin to form a linkage transmission mechanism.

[0040] The planar transformer in this embodiment is assembled according to the following steps: Step 1: Prepare the upper magnetic core 11; place the upper magnetic core 11 upside down with its open side facing upwards to facilitate the placement of the windings and insulating partitions 5; Step 2: Place the insulating partitions 5 and windings. According to the predetermined arrangement order, place the insulating partitions 5, primary winding 21, and secondary winding 22 in sequence. The specific order is: first place one insulating partition 5, then place the primary winding 21 or secondary winding 22, then place another insulating partition 5, and so on, alternating until all windings are placed; Step 3: Connect the terminals. While placing the windings, simultaneously connect the secondary winding 22 to the output terminal 4, and then connect the primary winding... Group 21 is sleeved on the input terminal 3. When sleeved, ensure that the fit between the winding and the terminal is tight and there is no looseness. Step 4: Fit the lower magnetic core 12. Fit the lower magnetic core 12 on the upper magnetic core 11 so that the mating surfaces of the two are tightly attached. At this time, the end face of the lower magnetic core 12 contacts the elastic post 71 in the upper magnetic core 11 and applies axial pressure to the elastic post 71. Step 5: Clamp and fix. The upper magnetic core 11 and the lower magnetic core 12 are clamped and fixed by the fixing buckle 6 engaging with the fixing slot 61 on the magnetic core 1. After the fixing buckle 6 is inserted into the slot, the upper magnetic core 11 and the lower magnetic core 12 form a stable integral structure.

[0041] Operation process: When the upper magnetic core 11 and the lower magnetic core 12 are connected together by the fixing buckle 6, the end face of the lower magnetic core 12 contacts the elastic post 71 inside the upper magnetic core 11, causing the elastic post 71 to be passively moved inward under axial pressure. The movement of the elastic post 71 drives the bending rod 73 to move synchronously, and the movement of the bending rod 73 simultaneously drives the vertical plate 741 and the vertical shaft 751 to move; Automatic connection of the secondary winding 22: When the vertical plate 741 moves, it drives the contact plate 745 to move through the movable connecting rod 743. Under the drive of the linkage mechanism, the contact plate 745 moves towards the connection hole of the secondary winding 22, and finally contacts and connects with the connection hole of the secondary winding 22, forming a reliable electrical path; Primary winding Automatic connection of 21: When the vertical shaft 751 moves, the movable rod 753 drives the arc plate 755 to move. Driven by the linkage mechanism, the arc plate 755 moves towards the connection hole of the primary winding 21 and finally contacts and connects with the connection hole of the primary winding 21, forming a reliable electrical path. Through the automatic connection mechanism of the contact component 7, the primary winding 21 and the secondary winding 22 no longer need to be welded to the input terminal 3 and the output terminal 4 to complete the electrical connection. At the same time, due to the action of the elastic column 71 and the fixed spring 72, the contact plate 745 and the arc plate 755 maintain continuous contact pressure with the winding connection hole, which has a locking effect and ensures the reliability of the connection. It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A planar transformer, characterized in that: include, The magnetic core component (1) includes an upper magnetic core (11) and a lower magnetic core (12). The winding assembly (2) includes a primary winding (21) and a secondary winding (22). The primary winding (21) has 4 pieces, and the secondary winding (22) has 8 pieces. The primary windings (21) are connected by cylindrical terminals, and the secondary windings (22) are connected by rectangular windings. The input terminal (3) and the output terminal (4) are provided, with the primary winding (21) sleeved on the input terminal (3) and the secondary winding (22) sleeved on the output terminal (4); Insulating partition (5) is laid between each winding to prevent short circuits between adjacent winding layers; A fixing buckle (6) is provided, which cooperates with a fixing slot (61) on the magnetic core (1) to fix the upper magnetic core (11) and the lower magnetic core (12) in a fixed connection. Contact component (7) is disposed in the upper magnetic core (11) to enable the input terminal (3) and output terminal (4) to automatically connect with the primary winding (21) and secondary winding (22) respectively and have a locking effect.

2. The planar transformer as described in claim 1, characterized in that: The contact assembly (7) includes an elastic post (71) which is embedded inside the upper magnetic core (11); A fixed spring (72) is installed at the embedded end of the elastic column (71); A bending rod (73) is installed at the embedded end of the elastic column (71), and the bending rod (73) extends toward the input terminal (3) and the output terminal (4) respectively. Output connector (74), the output connector (74) is provided at the extension end of the bent rod (73) on the side facing the output terminal (4); An input connector (75) is provided at the extension end of the bent rod (73) on the side facing the input terminal (3).

3. The planar transformer as described in claim 2, characterized in that: The output connector (74) includes: A vertical plate (741) is disposed inside the output terminal (4), and the top end of the vertical plate (741) is connected to the bent rod (73); A first connecting plate (742) is installed on the outer wall of the vertical plate (741); Movable link (743), which is connected to the first connecting plate (742) by a pin; A contact plate (745) is disposed within the output terminal (4) and extends out of the output terminal (4); The second connecting plate (744) is installed on the inner wall of the contact plate (745), and the second connecting plate (744) is movably connected to the movable connecting rod (743) by a pin.

4. The planar transformer as described in claim 3, characterized in that: The input connector (75) includes: A vertical shaft (751) is disposed within the input terminal (3); A first fixing plate (752) is installed on the outer wall of the vertical shaft (751); Movable rod (753), which is connected to the outer wall of the first fixed plate (752) by a pin; An arc-shaped plate (755) is disposed inside the input terminal (3); The second fixing plate (754) is installed on the inner wall of the arc plate (755), and the second fixing plate (754) is movably connected to the movable rod (753) by a pin.

5. The planar transformer as described in claim 4, characterized in that: During assembly, the upper magnetic core (11) is inverted, and each primary winding (21), secondary winding (22) and insulating partition (5) are placed according to the arrangement. The secondary winding (22) is simultaneously sleeved on the output terminal (4), and the primary winding (21) is sleeved on the input terminal (3). Then, the lower magnetic core (12) is fitted on the upper magnetic core (11), and the upper magnetic core (11) and lower magnetic core (12) are clamped by the fixing buckle (6) and the fixing slot (61).

6. The planar transformer as described in claim 5, characterized in that: When the fixing buckle (6) connects the upper magnetic core (11) and the lower magnetic core (12) together, the elastic column (71) on the upper magnetic core (11) is passively moved by the contact of the lower magnetic core (12). The movement of the elastic column (71) drives the bending rod (73) to move, and the movement of the bending rod (73) drives the vertical plate (741) and the vertical shaft (751) to move.

7. The planar transformer as described in claim 6, characterized in that: When the vertical plate (741) moves, the movable connecting rod (743) drives the contact plate (745) to move, so that the contact plate (745) makes contact with the connection hole of the secondary winding (22).

8. The planar transformer as described in claim 7, characterized in that: When the vertical shaft (751) moves, the movable rod (753) drives the arc plate (755) to move, so that the arc plate (755) contacts and connects with the connection hole of the primary winding (21).

9. The planar transformer as described in claim 8, characterized in that: The contact assembly (7) eliminates the need for soldering between the primary winding (21) and the secondary winding (22) and the input terminal (3) and the output terminal (4).

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