A flat magnetic integrated inductor and transformer
Patent Information
- Application Number
- CN202522194527.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-17
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-10-17
AI Technical Summary
[0010]本实用新型的技术方案中,电感器和变压器共用一个磁芯，极大降低电感器和变压器的面积、体积重量；同时，对于电感器和变压器的绕组，采用扁平线圈绕制，且分别绕制于对应磁芯上的变压器绕组骨架和电感器绕组骨架的方案，在降低损耗的同时，又增大了绕组散热面积,极大程度降低损耗和温升。与现有技术相比，本实用新型在在平面面积上，尺寸可优化1/2，体积重量可以优化1/4；同时，电感器绕组和变压器绕组是独立隔离的，保证了电气绝缘性能；且该方案可根据实际设计的需要，简单的进行调整，无论是磁芯还是绕组，加工和装配不复杂，可实现加工的批量化。
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Figure CN224907759U_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to magnetic integration technology, and particularly relates to a high-heat-dissipation magnetically integrated inductor and transformer structure applicable to the field of switching power supplies. Background Art
[0002] With the development of power electronics technology, switching power supplies are also developing in the direction of high density, miniaturization and high efficiency. Under this trend, magnetic components such as inductors and transformers, as indispensable key devices, have become the focus of design optimization. Especially in DC-DC conversion circuits of medium and high-power switching power supplies, statistics show that magnetic components such as transformers and inductors account for about 20%-40% of the weight and volume of the conversion circuit. In actual design, the demand for lightweight transformers and inductors is contradictory and mutually restricted with loss and temperature rise. How to ensure the lightweight of transformers and inductors while reducing their loss and temperature rise has become a difficult problem to be solved in the design of magnetic components for switching power supplies, and is also the main research direction. Summary of the Invention
[0003] In view of the above problems existing in the prior art, the present utility model proposes a flat magnetically integrated inductor and transformer, which can reduce the volume and weight of the inductor and transformer while reducing loss and temperature rise, so as to achieve dual balance and dual optimization of volume, weight, loss and temperature rise.
[0004] The technical solution of the present utility model is as follows: A flat magnetically integrated inductor and transformer, comprising a base plate, a transformer magnetic core, a shared magnetic core, an inductor magnetic core, a transformer winding and an inductor winding, wherein the inductor magnetic core is fixed on the base plate and is attached and connected to one side of the shared magnetic core; the transformer magnetic core is located on the other side of the shared magnetic core and is attached and connected to the shared magnetic core; the transformer winding and the inductor winding are wound by flat coils, the transformer winding is arranged in the area between the transformer magnetic core and the shared magnetic core, and the inductor winding is arranged in the area between the inductor magnetic core and the shared magnetic core; the leading-out ends of the transformer winding and the inductor winding are fixed on the base plate.
[0005] Further, each of the transformer magnetic core, the shared magnetic core and the inductor magnetic core is a flat E-type magnetic core; one side of the column surface of the flat E-type shared magnetic core is attached and connected to the column surface of the flat E-type transformer, forming a "day"-shaped transformer magnetic core; one side of the I-shaped connection surface of the flat E-type shared magnetic core is attached and connected to the column surface of the flat E-type inductor magnetic core, forming a "day"-shaped inductor magnetic core.
[0006] Further, the flat magnetically integrated inductor and transformer further comprise a transformer winding bobbin and an inductor winding bobbin each having a rectangular cross section; the rectangular transformer winding bobbin and the rectangular inductor winding bobbin are respectively fitted over the central post of the "日"-shaped transformer magnetic core and the central post of the "日"-shaped inductor magnetic core, and the transformer winding and the inductor winding are respectively wound around the rectangular transformer winding bobbin and the inductor winding bobbin.
[0007] Further, a U-shaped inductor retaining wall is further arranged between the I-shaped connecting surface of the common magnetic core and the inductor winding, two side edges of the U-shaped inductor retaining wall are parallel to the two side columns of the flat E-shaped common magnetic core, and the connecting portion of the U-shaped structure is perpendicular to the middle column of the flat E-shaped common magnetic core.
[0008] Further, the wire of the transformer winding adopts a film-covered pressed-square Litz wire and is wound by a sandwich winding process; the wire of the inductor winding adopts a film-covered pressed-square Litz wire.
[0009] Further, the transformer magnetic core, the inductor magnetic core and the common magnetic core are all ferrite magnetic cores.
[0010] In the technical solution of the present utility model, the inductor and the transformer share one magnetic core, which greatly reduces the area, volume and weight of the inductor and the transformer; at the same time, for the windings of the inductor and the transformer, the scheme of adopting flat coil winding and respectively winding the windings on the transformer winding bobbin and the inductor winding bobbin on the corresponding magnetic cores reduces the loss while increasing the heat dissipation area of the windings, and greatly reduces the loss and temperature rise. Compared with the prior art, the size of the present utility model can be optimized by 1 / 2 in the planar area, and the volume and weight can be optimized by 1 / 4; at the same time, the inductor winding and the transformer winding are independently isolated, which ensures the electrical insulation performance; moreover, the scheme can be simply adjusted according to the requirements of actual design, no matter the magnetic core or the winding, the processing and assembly are not complicated, and mass production can be realized. Brief Description of the Drawings
[0011] Figure 1 is a schematic structural diagram of a magnetically integrated inductor and transformer according to an embodiment of the present utility model; Figure 2 is an exploded structural view of a magnetically integrated inductor and transformer according to an embodiment of the present utility model; Figure 3 is a schematic diagram of a winding bobbin in an embodiment of the present utility model; Figure 4 is a schematic structural diagram of a transformer magnetic core and a common magnetic core in an embodiment of the present utility model; Figure 5 is a schematic structural diagram of an inductor magnetic core in an embodiment of the present utility model; Figure 6 is a schematic diagram of an inductor retaining wall in an embodiment of the present utility model; Figure 7 is a schematic diagram of the principle of a magnetically integrated inductor and a transformer according to an embodiment of the present utility model.
[0012] Reference numerals of the drawings: 1. Transformer magnetic core; 2. Transformer winding; 3. Shared magnetic core; 4. Inductor retaining wall; 5. Inductor winding; 6. Inductor magnetic core; 7. Base plate. Detailed Description of the Preferred Embodiments
[0013] To make the purposes, technical solutions and advantages of the present utility model clearer, the present utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model, and are not intended to limit the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.
[0014] As shown in Figure 1 , Figure 2 an embodiment of the magnetically integrated planar inductor and transformer structure of the present utility model includes a transformer magnetic core 1, a transformer winding 2, a shared magnetic core 3, an inductor retaining wall 4, an inductor winding 5, an inductor magnetic core 6 and a base plate 7; the inductor magnetic core 6 and the transformer magnetic core 1 are arranged on two sides of the shared magnetic core 3, the inductor magnetic core 6 is fixed on the base plate 7, the inductor winding 5 is placed in the area between the inductor magnetic core 6 and the shared magnetic core 3, and the transformer winding 2 is placed in the area between the transformer magnetic core 1 and the shared magnetic core 3; the base plate 7 is used for fixing and pin forming, which facilitates assembly in the production process, and the four outlet terminals of the primary and secondary windings of the transformer winding 2 and the two outlet terminals of the inductor winding 5 are all inserted into the base plate 7 for fixing.
[0015] In the above embodiment, the transformer magnetic core 1, the shared magnetic core 3 and the inductor magnetic core 6 are all flat E-shaped magnetic cores; one side of the column surface of the shared magnetic core 3 is attached and connected to the column surface of the transformer magnetic core 1 to form a "day"-shaped transformer magnetic core, forming a closed magnetic circuit; one side of the I-shaped connection surface of the shared magnetic core 3 is attached and connected to the column surface of the inductor magnetic core 6 to form a "day"-shaped inductor magnetic core, forming a closed magnetic circuit.
[0016] Preferably, in the embodiment, there is also provided as shown in Figure 3The transformer winding bobbin and inductor winding bobbin with a rectangular cross-section as shown; the transformer winding bobbin and inductor winding bobbin with a rectangular cross-section are respectively sleeved on the central legs of the above-mentioned "日"-shaped transformer core and "日"-shaped inductor core, and the transformer winding and inductor winding are respectively wound on the corresponding bobbins. The above bobbin design not only ensures the insulation between the windings and the magnetic cores, but also increases the contact area between the windings and the heat-conducting material, which has a significant effect on reducing temperature rise in practical use.
[0017] As shown in Figure 4 , Figure 5 , in another embodiment of the present utility model, the transformer core 1 and the common core 3 are both flat E-shaped cores of the same specification, and the two side legs of the core are 0.3mm higher than the central leg; the inductor core 6 is also a flat E-shaped core, and its two side legs are 2mm higher than the central leg; the common core 3 serves as the common magnetic core for the transformer and the inductor, one side of its leg surface serves as part of the magnetic core for the transformer winding, and one side of its I-shaped connection surface serves as part of the magnetic core for the inductor winding. The leg surface side of the flat E-shaped common core is attached and connected to the leg surface of the flat E-shaped transformer to form a "日"-shaped transformer core; the I-shaped connection surface side of the flat E-shaped common core is attached and connected to the leg surface of the flat E-shaped inductor core to form a "日"-shaped inductor core. In practical applications, the inherent magnetizing inductance of the transformer can be adjusted by adjusting the air gap between the attached core legs of the common core 3 and the transformer core 1; the required inductance of the inductor can be achieved by adjusting the air gap of the core leg between the attached common core 3 and inductor core 6.
[0018] Preferably, in some embodiments, between the I-shaped connection surface of the flat E-shaped common core 3 and the inductor winding 5, there is further provided an inductor baffle wall 4 with a U-shaped structure as shown in Figure 6 , the two side edges of the inductor baffle wall 4 are parallel to the two side legs of the flat E-shaped common core 3, and the connecting portion of the inductor baffle wall 4 is perpendicular to the central leg of the flat E-shaped common core 3. Generally, the core leg air gap of the inductor is relatively large. To avoid high winding loss caused by the eddy current effect around the air gap, a baffle wall is added at the position of the core leg air gap, so as to keep the winding away from the air gap and reduce winding loss and temperature rise. The inductor baffle wall 4 is independent of the winding, and its thickness can be appropriately adjusted according to the size of the air gap, with simple operation.
[0019] The schematic diagram of the winding circuit principle of the inductor and the transformer in the embodiment is as shown in Figure 7 , the transformer adopts a sandwich winding process, and the wire adopts film-coated square-compacted Litz wire, which can reduce eddy current loss and high-frequency loss; the inductor adopts film-coated square-compacted Litz wire, which can also reduce eddy current loss and high-frequency loss; the transformer winding and the inductor winding are isolated from each other, which fully ensures the insulation performance and reliability of the product.
[0020] Preferably, in the embodiments of this utility model, based on the functional characteristics of the transformer and the inductor, the transformer core 1, the common core 3 and the inductor core 6 are all selected as ferrite cores, so that the magnetic components have high permeability and low loss.
[0021] In the assembly process of the flat magnetic integrated inductor and transformer of this utility model, the transformer winding is assembled first. After the common magnetic core is installed, the inductor retaining wall and the inductor winding are assembled in sequence. Finally, the positioning plate is installed. The assembly process is simple, easy to understand and highly efficient.
[0022] The technical solution of this utility model significantly reduces the area and volume of the flat magnetic integrated inductor and transformer, while also greatly reducing their weight. When used in switching power supplies, the flat magnetic integrated inductor and transformer employing this novel technical solution effectively reduces losses and suppresses temperature rise, thereby improving the product's high efficiency and ensuring its high reliability and safety.
[0023] It should be noted that the above-described figures and specific embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention.
Claims
1. A flat magnetic integrated inductor and transformer, characterized in that, comprising: a base plate, a transformer core, a common magnetic core, an inductor core, a transformer winding and an inductor winding, wherein the inductor core is fixed to the base plate and is attached and connected to one side of the common magnetic core; the transformer core is located on the other side of the common magnetic core and is attached and connected to the common magnetic core; the transformer winding and the inductor winding are wound by flat coils, the transformer winding is arranged in the area between the transformer core and the common magnetic core, and the inductor winding is arranged in the area between the inductor core and the common magnetic core; the leading-out terminals of the transformer winding and the inductor winding are fixed to the base plate.
2. The flat magnetic integrated inductor and transformer according to claim 1, characterized in that: The transformer core, the common magnetic core and the inductor core are all flat E-shaped magnetic cores; one side of the column surface of the flat E-shaped common magnetic core is attached and connected to the column surface of the flat E-shaped transformer, forming a "日"-shaped transformer magnetic core; one side of the I-shaped connection surface of the flat E-shaped common magnetic core is attached and connected to the column surface of the flat E-shaped inductor core, forming a "日"-shaped inductor magnetic core.
3. The flat magnetic integrated inductor and transformer according to claim 2, characterized in that: The device further comprises a transformer winding bobbin and an inductor winding bobbin each with a rectangular cross section; the rectangular transformer winding bobbin and the rectangular inductor winding bobbin are respectively sleeved on the central column of the "日"-shaped transformer magnetic core and the central column of the "日"-shaped inductor magnetic core, and the transformer winding and the inductor winding are respectively wound around the rectangular transformer winding bobbin and the inductor winding bobbin.
4. The flat magnetic integrated inductor and transformer according to claim 2, characterized in that: The device further comprises an inductor retaining wall of U-shaped structure, which is arranged between the I-shaped connection surface of the flat E-shaped common magnetic core and the inductor winding, two side edges of the U-shaped inductor retaining wall are parallel to the two side columns of the flat E-shaped common magnetic core, and the connecting part of the U-shaped structure is perpendicular to the middle column of the flat E-shaped common magnetic core.
5. The flat magnetic integrated inductor and transformer according to claim 1, characterized in that: The transformer core, the inductor core and the common magnetic core are all ferrite magnetic cores.