A transformer module and switching power supply
Patent Information
- Application Number
- CN202521866504.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-29
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-08-29
AI Technical Summary
[0003]有鉴如此，本实用新型要解决的技术问题是提供一种变压器模组及开关电源，以解决高频空心变压器抗干扰性能差的问题
[0023]本实用新型的有益效果在于：本发明实施例的变压器模组至少包括两个变压器，两个变压器的一次侧导电绕组位于基板的同一层且绕向相同、电流流向相反，两个变压器的二次侧导电绕组位于基板的同一层且绕向相同、电流流向相反，即通过两个变压器同时工作且电流流入方向相反，实现磁通方向相反，达到磁通抵消的效果，提高了抗外界EMI干扰的能力。
Smart Images
Figure CN224720692U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of transformer manufacturing, and in particular to a transformer module and a switching power supply. Background Technology
[0002] Currently, with the advancement of circuit technology and IC packaging technology, the frequency of switching power supplies can operate at tens of megahertz or higher, prompting switching power supplies to shrink from modular packaging to chip-based packaging, achieving smaller power module sizes. At the same time, the increase in power supply frequency reduces the inductance requirements of transformers, allowing transformers to be directly transformed from traditional magnetic transformer structures into non-magnetic hollow transformer structures. However, hollow transformer structures have the disadvantage of poor EMI immunity. Utility Model Content
[0003] Therefore, the technical problem to be solved by this utility model is to provide a transformer module and a switching power supply to solve the problem of poor anti-interference performance of high-frequency air-core transformers.
[0004] As the first aspect of this utility model, the technical solution of the provided transformer module embodiment is as follows:
[0005] A transformer module, wherein at least:
[0006] substrate;
[0007] The first transformer includes a first primary conductive winding and a first secondary conductive winding, both of which include a helical coil disposed in the substrate.
[0008] The second transformer includes a second primary conductive winding and a second secondary conductive winding, both of which include a helical coil disposed in the substrate.
[0009] There are at least 8 welded structures, with each of the two ends of the conductive winding connected to a welded structure;
[0010] Each conductive winding is a single layer. The first primary conductive winding and the second primary conductive winding are located on the same layer of the substrate and have the same winding direction and opposite current flow direction. The first secondary conductive winding and the second secondary conductive winding are located on the same layer of the substrate and have the same winding direction and opposite current flow direction.
[0011] Furthermore, the first primary-side conductive winding and the first secondary-side conductive winding are disposed in different layers along the thickness direction of the substrate.
[0012] Preferably, the substrate is a PCB substrate or a packaging carrier board.
[0013] Furthermore, the first primary side conductive winding has two or more layers, and each layer containing the first primary side conductive winding is provided with a corresponding second primary side conductive winding.
[0014] And / or the first secondary side conductive winding has two or more layers, and each layer of the first secondary side conductive winding is provided with a corresponding layer of the second secondary side conductive winding.
[0015] Preferably, the first primary conductive winding of each layer is disposed on one side along the thickness direction of the substrate, and the first secondary conductive winding of each layer is disposed on the other side along the thickness direction of the substrate.
[0016] Preferably, at least a portion of the first primary side conductive winding and the first secondary side conductive winding of each layer are alternately disposed in different layers along the thickness direction of the substrate.
[0017] Preferably, the welding structure of the first primary conductive winding and the second primary conductive winding is located on one side of the substrate surface, and the welding structure of the first secondary conductive winding and the second secondary conductive winding is located on the other side of the substrate surface.
[0018] Furthermore, each conductive winding is connected to the welding structure inside the substrate, and the conductive winding is electrically connected to the external circuit through the welding structure by means of wire bonding or ball bonding flip-chip bonding.
[0019] Preferably, each welding structure is a welding pad.
[0020] Preferably, ignoring the area where each conductive winding is connected to the electrical connection structure, the transformer module includes a cross-section of all conductive windings that is symmetrical along the thickness direction of the substrate.
[0021] As a second aspect of this utility model, the technical solution of the provided switching power supply embodiment is as follows:
[0022] A switching power supply, wherein: it includes the transformer module described in any of the first aspects above.
[0023] The beneficial effects of this utility model are as follows: The transformer module of this embodiment includes at least two transformers. The primary conductive windings of the two transformers are located on the same layer of the substrate and have the same winding direction and opposite current flow direction. The secondary conductive windings of the two transformers are located on the same layer of the substrate and have the same winding direction and opposite current flow direction. That is, by having the two transformers work at the same time and have opposite current flow directions, the magnetic flux directions are opposite, achieving the effect of magnetic flux cancellation and improving the ability to resist external EMI interference. Attached Figure Description
[0024] Figure 1This is a schematic diagram of the structure of the first type of transformer module of this utility model;
[0025] Figure 2 for Figure 1 A schematic diagram of the planar structure of one of the layers;
[0026] Figure 3 This is a schematic diagram of the structure of the second type of transformer module of this utility model;
[0027] Figure 4 This is a schematic diagram of the structure of the third type of transformer module of this utility model. Detailed Implementation
[0028] The present invention and its beneficial effects will be further described in detail below with reference to specific embodiments and accompanying drawings. However, the specific embodiments of the present invention are not limited thereto.
[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0030] Unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0031] In this utility model, unless otherwise stated, directional terms such as "up," "down," "left," and "right" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.
[0032] To address the poor anti-interference performance of high-frequency air-core transformers, the transformer module provided by this invention includes at least: a substrate; a first transformer, comprising a first primary conductive winding and a first secondary conductive winding, both of which are helical coils disposed in the substrate; a second transformer, comprising a second primary conductive winding and a second secondary conductive winding, both of which are helical coils disposed in the substrate; at least eight welding structures, with each conductive winding connected to one welding structure at each of its two ends; each conductive winding is a single layer, with the first primary conductive winding and the second primary conductive winding located in the same layer of the substrate and having the same winding direction and opposite current flow direction, and the first secondary conductive winding and the second secondary conductive winding located in the same layer of the substrate and having the same winding direction and opposite current flow direction.
[0033] The above-mentioned transformer module includes at least two transformers. The primary conductive windings of the two transformers are located on the same layer of the substrate and have the same winding direction and opposite current flow direction. The secondary conductive windings of the two transformers are located on the same layer of the substrate and have the same winding direction and opposite current flow direction. That is, by having the two transformers work simultaneously and have opposite current flow directions, the magnetic flux directions are reversed, achieving the effect of magnetic flux cancellation and improving the ability to resist external EMI interference.
[0034] Furthermore, the first primary conductive winding of each layer is arranged on one side along the thickness direction of the substrate, and the first secondary conductive winding of each layer is arranged on the other side along the thickness direction of the substrate. That is, the spiral coil of the same layer is on the same side of the transformer, and there is no voltage withstand requirement between the primary and secondary sides. This structure can maximize the use of the substrate area, thereby miniaturizing the transformer as much as possible and reducing costs.
[0035] Those skilled in the art can choose the substrate as needed, and the present invention does not impose any restrictions. For example, common PCB substrates or packaging carriers can be selected.
[0036] Figure 1 This is a schematic diagram of the structure of the first type of transformer module of this utility model. Figure 2 for Figure 1 Please refer to the schematic diagram of one of the floor plans. Figure 1 and Figure 2 The transformer module 401 includes a substrate, a first transformer 301, a second transformer 302, and spiral coils 201, 202, 203, and 204. Spiral coils 201 and 202 are the primary sides, and spiral coils 203 and 204 are the secondary sides. The primary spiral coil 201 and the secondary spiral coil 203 form the first transformer 301, and the primary spiral coil 202 and the secondary spiral coil 204 form the second transformer 302. The primary spiral coils 201 and 202 are located in the same layer 101 of the PCB substrate or packaging carrier 401 (e.g., ...). Figure 2 As shown), the secondary spiral coil 203 and secondary spiral coil 204 are located in the same layer 102 of another layer on the PCB substrate or package carrier (not shown in the figure), and the primary spiral coil 201 and primary spiral coil 202 have the same spiral winding direction (as shown in the figure). Figure 2 As shown in the diagram, the spiral winding direction of both the primary spiral coil 201 and the primary spiral coil 202 is counterclockwise from the inside out. The advantage of having the primary spiral coil 201 and the primary spiral coil 202 located on the same layer 101 is that having the two primary sides on the same layer can maximize the utilization of the substrate area, thereby miniaturizing the transformer and saving costs.
[0037] Specifically, the primary spiral coil 201 and the secondary spiral coil 203 are located on different layers of the substrate and have an up-down symmetrical structure. The primary spiral coil 202 and the secondary spiral coil 204 are located on different layers of the PCB substrate or the packaging carrier 401 and have an up-down symmetrical structure.
[0038] Furthermore, the current flows in opposite directions in the primary helical coil 201 and the primary helical coil 202, such as... Figure 2 As shown, the current flow direction of the primary helical coil 201 is counterclockwise from the inside to the outside, while the current flow direction of the primary helical coil 202 is clockwise from the outside to the inside. The advantage of having opposite current flows in the same layer of coils is that when the two transformers work simultaneously, the magnetic flux directions can be opposite, thereby achieving magnetic flux cancellation and improving the transformer module's ability to resist external EMI interference.
[0039] Specifically, please see Figure 1 The substrate has four soldering structures on the top layer. The primary spiral coil 201 is connected to the top layer soldering structure 501 (through a through-hole), and the primary spiral coil 202 is connected to the top layer soldering structure 502 (through a trace and a through-hole). Figure 1 (As shown in the middle), the secondary spiral coil 203 is connected to the top-layer welding structure 503 (through wiring and through-holes). Figure 1 (As shown in the middle), the secondary spiral coil 204 is connected to the top welding structure 504 (through a through hole).
[0040] In specific implementation, the method of electrical connection between the spiral coils 201, 202, 203, and 204 and the external circuit can be selected by those skilled in the art as needed, and the present invention does not impose any restrictions. For example, the electrical connection with the external circuit can be achieved by using wire bonding or flip-chip bonding of the top-layer pads 501, 502, 503, and 504. The welding structure can be selected by those skilled in the art as needed, and the present invention does not impose any restrictions. For example, common pads can be selected.
[0041] Specifically, please see Figure 2 Ignoring the areas where each conductive winding is connected to the electrical connection structure (e.g., the area where the primary spiral coil 201 is connected to the top welding structure 501 through the left through hole, and the area where the secondary spiral coil 204 is connected to the top welding structure 504 through the right through hole), the cross-section of the transformer module, including all conductive windings, is symmetrical along the thickness direction of the substrate.
[0042] As a specific embodiment, the first primary side conductive winding has two or more layers, and each layer containing the first primary side conductive winding is provided with a corresponding layer of the second primary side conductive winding; and / or the first secondary side conductive winding has two or more layers, and each layer containing the first secondary side conductive winding is provided with a corresponding layer of the second secondary side conductive winding.
[0043] Furthermore, the first primary conductive winding of each layer is disposed on one side along the substrate thickness direction, and the first secondary conductive winding of each layer is disposed on the other side along the substrate thickness direction. Figure 3 For a specific schematic diagram of this structure, please refer to Figure 3 , Figure 3 and Figure 1 The transformer module 401 provided is different from the one provided. Figure 3 The provided transformer module 402 has spiral coils 201 and 202 occupying two layers of the substrate; spiral coils 203 and 204 occupy two layers of the substrate. Spiral coils 201 and 202 are the primary windings of the transformer module 402, and spiral coils 203 and 204 are the secondary windings of the transformer module. Figure 3 and Figure 1 The transformer module 401 provided has the same spiral coils on the same layer with the same winding direction and opposite current flow direction.
[0044] Furthermore, at least a portion of the primary conductive winding and the secondary conductive winding of each layer are alternately disposed in different layers along the thickness direction of the substrate. Figure 4 For a specific schematic diagram of this structure, please refer to Figure 4 , Figure 4 and Figure 1 The transformer module 401 provided is different from the one provided. Figure 4 The provided transformer module 403 has spiral coils 201 and 202 occupying two layers of the PCB substrate or packaging carrier; spiral coils 203 and 204 occupy two layers of the PCB substrate or packaging carrier. If spiral coils 201 and 202 are the primary windings of the transformer module 403, then spiral coils 203 and 204 are the secondary windings of the transformer module 403; if spiral coils 201 and 202 are the secondary windings of the transformer module 403, then spiral coils 203 and 204 are the primary windings of the transformer module 403, and spiral coils 203 and 204 are located between spiral coils 201 and 202. This structure, where one primary winding sandwiches another, can further improve the coupling of the transformer, thereby further improving the performance of the transformer. Similarly, the spiral coils on the same layer have the same winding direction and opposite current flow directions.
[0045] This utility model also provides a switching power supply, including any of the above-mentioned transformer modules.
[0046] The above are merely preferred embodiments of the present utility model. It should be noted that the above preferred embodiments should not be regarded as limitations on the present utility model. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of the present utility model. These improvements and modifications should also be regarded as the protection scope of the present utility model. Here, the embodiments will not be repeated. The protection scope of the present utility model should be determined by the scope defined in the claims.
Claims
1. A transformer module, characterized in that, At least including: substrate; The first transformer includes a first primary conductive winding and a first secondary conductive winding, both of which include a helical coil disposed in the substrate. The second transformer includes a second primary conductive winding and a second secondary conductive winding, both of which include a helical coil disposed in the substrate. There are at least 8 welded structures, with each of the two ends of the conductive winding connected to a welded structure; Each conductive winding is a single layer. The first primary conductive winding and the second primary conductive winding are located on the same layer of the substrate and have the same winding direction and opposite current flow direction. The first secondary conductive winding and the second secondary conductive winding are located on the same layer of the substrate and have the same winding direction and opposite current flow direction.
2. The transformer module according to claim 1, characterized in that: The first primary side conductive winding and the first secondary side conductive winding are disposed in different layers along the thickness direction of the substrate.
3. The transformer module according to claim 1, characterized in that: The substrate is a PCB substrate or a packaging carrier board.
4. The transformer module according to claim 1, characterized in that: The first primary side conductive winding has two or more layers, and each layer containing the first primary side conductive winding is provided with a corresponding layer of the second primary side conductive winding. And / or the first secondary side conductive winding has two or more layers, and each layer of the first secondary side conductive winding is provided with a corresponding layer of the second secondary side conductive winding.
5. The transformer module according to claim 4, characterized in that: The first primary conductive winding of each layer is disposed on one side along the thickness direction of the substrate, and the first secondary conductive winding of each layer is disposed on the other side along the thickness direction of the substrate.
6. The transformer module according to claim 4, characterized in that: At least a portion of the first primary side conductive winding and the first secondary side conductive winding of each layer are alternately disposed in different layers along the thickness direction of the substrate.
7. The transformer module according to claim 1, characterized in that: The welding structure of the first primary conductive winding and the second primary conductive winding is located on one side of the substrate surface, and the welding structure of the first secondary conductive winding and the second secondary conductive winding is located on the other side of the substrate surface.
8. The transformer module according to claim 1, characterized in that: Each conductive winding is connected to the welding structure inside the substrate, and the conductive winding is electrically connected to the external circuit through the welding structure by means of wire bonding or ball bonding flip-chip.
9. The transformer module according to claim 1, characterized in that: Each welded structure consists of a solder pad.
10. The transformer module according to any one of claims 1 to 9, characterized in that: Ignoring the areas where each conductive winding is connected to the electrical connection structure, the transformer module has a cross-section that is symmetrical about left and right along the thickness direction of the substrate, including all conductive windings.
11. A switching power supply, characterized in that: Includes the transformer module as described in any one of claims 1 to 10.