LLC magnetic element winding integrated structure

Abstract

The utility model discloses an LLC magnetic element winding integrated structure which comprises a resonant inductor middle column, a transformer middle column and a PCB winding, the resonant inductor middle column and the transformer middle column are transversely arranged in parallel, the PCB winding surrounds the resonant inductor middle column and the transformer middle column to be integrated together in a routing mode, and the PCB winding surrounds the resonant inductor middle column and the transformer middle column at the same time. A resonant inductor winding and a transformer primary winding can be integrated, so that winding loss and the size of a magnetic element are reduced, and the purpose of improving power density and efficiency is achieved. According to the magnetic integration mainly based on the PCB winding form, when a certain layer of PCB is provided with the resonant inductor and the transformer primary side winding at the same time, the winding modes of the resonant inductor and the transformer primary side winding are not independently carried out any more and are integrated together, so that the winding length is reduced, and the purposes of reducing winding loss and reducing the magnetic core size are achieved.

Description

Technical Field

[0001] This utility model relates to a winding integration structure, specifically to an LLC magnetic element winding integration structure. Background Technology

[0002] With the development of power electronics technology, the demand for efficiency and power density in switching power supplies is gradually increasing. High-power-density power supply design presents significant challenges in switching frequency, component selection, magnetic component design, and heat dissipation design. LLC topology, due to its superior performance, is widely used in switching power supply design. To reduce the size of magnetic components, its resonant inductor and transformer are typically designed with magnetic integration. How to further reduce the size and losses of magnetic components is an urgent problem to be solved.

[0003] Figure 1 and Figure 2 As shown, the current processing method is:

[0004] 1. The magnetic integration design adopted by LLC resonant inductors and transformers presents the effect of a single magnetic element as a whole. Its structure is usually as follows: the center column design of the resonant inductor and transformer is independent, while the side columns are shared to reduce the overall volume. The winding of the resonant inductor winding and the winding of the transformer winding are carried out around their respective center columns. A certain number of turns are wound according to the required inductance and the air gap of their respective center columns is adjusted.

[0005] 2. One problem with traditional magnetic integration is that the distance between the two central columns needs to be used to wind the resonant inductor and transformer windings. Although the magnetic core is integrated in the design, the winding of the resonant inductor and the transformer winding are relatively independent, and they are only connected at a single point at their endpoints. The distance between the two central columns should meet the current density requirements, so the size design of the magnetic components is subject to certain limitations. Utility Model Content

[0006] To address the issues of large magnetic component size and high winding losses, this invention provides an integrated LLC magnetic component winding structure.

[0007] This utility model provides the following technical solution:

[0008] An LLC magnetic component winding integrated structure includes a resonant inductor center column, a transformer center column, and a PCB winding. The resonant inductor center column and the transformer center column are arranged horizontally and parallel to each other. The PCB winding is integrated around the resonant inductor center column and the transformer center column, and the PCB winding simultaneously surrounds the resonant inductor center column and the transformer center column.

[0009] Furthermore, a common side post is provided on both sides of the central column of the resonant inductor and the central column of the transformer.

[0010] Furthermore, there is an air gap between the resonant inductor column and the transformer column.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The magnetic component winding integrated structure of this utility model includes a resonant inductor center column, a transformer center column, and a PCB winding. The PCB winding simultaneously surrounds both the resonant inductor center column and the transformer center column, enabling the integration of the resonant inductor winding and the transformer primary winding, thereby reducing winding losses and magnetic component volume, and achieving the goal of improving power density and efficiency. This application is mainly based on magnetic integration in the form of PCB winding. When a certain layer of PCB has both resonant inductor and transformer primary windings, the winding methods of the two are no longer independent, but integrated together, thereby reducing the winding length and achieving the goal of reducing winding losses and core volume. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the winding process for a traditional magnetic integration scheme.

[0013] Figure 2 This is a cross-sectional view of a traditional magnetic integration scheme winding (taking single-layer winding as an example).

[0014] Figure 3 This is a schematic diagram of the winding integration structure of this utility model (the distance between the center columns is reduced);

[0015] Figure 4 This is a cross-sectional view of the winding integrated structure of this utility model (taking a single-layer winding as an example).

[0016] In the diagram: 1. Resonant inductor center column; 2. Transformer center column; 3. PCB winding; 4. Side column; 5. Air gap. Detailed Implementation

[0017] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] This invention utilizes a PCB-based winding integration scheme to integrate the resonant inductor winding and the transformer primary winding in an LLC circuit. To facilitate explanation of this invention and highlight its advantages over traditional magnetic integration schemes, this paper combines... Figures 1 to 4 Let's elaborate.

[0019] Figure 1 This refers to the traditional magnetic integration scheme for winding the resonant inductor and the primary winding of the transformer. Figure 2 for Figure 1 The corresponding cross-sectional view.

[0020] Figure 3 This refers to the winding method of the resonant inductor and the primary winding of the transformer involved in the winding integration scheme. Figure 4 for Figure 3 The corresponding cross-sectional view.

[0021] In traditional magnetic integration schemes, the resonant inductor and the transformer are wound around their respective central columns. After the resonant inductor is wound, it is connected to the primary winding of the transformer. There are both resonant inductor windings and transformer windings running between the two central columns, which restricts the reduction of the core size. Figure 1 The winding method of only one layer is shown. In actual design, there are multiple layers, and the layers need to be connected by vias. This means that the windings of the resonant inductor and the windings of the transformer have their own connection vias.

[0022] This application is as follows Figure 3 As shown, the PCB windings simultaneously surround both the resonant inductor's center column and the transformer's center column, resulting in a simpler and more efficient wiring method.

[0023] This utility model discloses an LLC magnetic component winding integrated structure, including a resonant inductor center post 1, a transformer center post 2, and a PCB winding 3. The resonant inductor center post 1 and the transformer center post 2 are arranged horizontally and parallel to each other. The PCB winding 3 is integrated around the resonant inductor center post 1 and the transformer center post 2, and the PCB winding 3 simultaneously surrounds the resonant inductor center post 1 and the transformer center post 2.

[0024] A common side post 4 is set on both sides of the resonant inductor center post 1 and the transformer center post 2.

[0025] An air gap 5 exists between the resonant inductor's center column 1 and the transformer's center column 2. The main function of the air gap is to prevent magnetic saturation and control the inductance.

[0026] Traditional method: The distance between the two central columns needs to take into account the winding of the resonant inductor and the transformer, so the distance cannot be too small.

[0027] Compared to the traditional method, there is no longer a primary winding between the two center columns (note: there is a transformer secondary winding in other layers), thus greatly reducing the total length of the primary winding and consequently lowering winding losses. Simultaneously, since there is no longer a primary winding between the center columns (see comparison...), Figure 2 and Figure 4The distance between the center columns is designed to meet only the current density of the transformer's secondary winding. Reducing the distance between the center columns decreases the core volume and the overall length of the primary winding, ultimately achieving a reduction in both core volume and winding losses, which is highly beneficial for increasing power density. Furthermore, due to winding integration within the same layer, the number of vias is reduced compared to traditional magnetic integration schemes, saving internal PCB space.

[0028] High power density switching power supplies typically have relatively high switching frequencies, which allows for a reduction in the inductance of transformers or resonant inductors. Therefore, the magnetic components are designed using PCB windings, with a magnetic core containing a certain air gap attached to a multi-layer PCB winding to obtain the required inductance, thereby maximizing the control over the size of the magnetic components.

[0029] Advantages of this utility model:

[0030] 1. Compared with traditional magnetic integration solutions, the parameters are not affected when the power supply is operating normally;

[0031] 2. The winding length is greatly reduced compared to the traditional method, the number of vias is reduced by half, and copper loss is reduced;

[0032] 3. The volume of the magnetic core is further reduced, which is beneficial to improving power density.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An LLC magnetic element winding integration structure, characterized in that: It includes a resonant inductor center column (1), a transformer center column (2) and a PCB winding (3). The resonant inductor center column (1) and the transformer center column (2) are arranged horizontally and parallel to each other. The PCB winding (3) is integrated around the resonant inductor center column (1) and the transformer center column (2). The PCB winding (3) simultaneously surrounds the resonant inductor center column (1) and the transformer center column (2).

2. The LLC magnetic component winding integration structure of claim 1, wherein: The resonant inductor column (1) and the transformer column (2) are provided with a common side column (4) on both sides.

3. The LLC magnetic component winding integration structure of claim 1, wherein: An air gap (5) exists between the resonant inductor column (1) and the transformer column (2).

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