Transformer and manufacturing method thereof

Abstract

The transformer comprises a primary side winding and a secondary side winding which are arranged at intervals, an insulating substrate wrapping the primary side winding and the secondary side winding, and a first open hole and a plurality of second open holes which are located in the insulating substrate, the primary side winding and the secondary side winding surround the outer side of the first open hole, and the second open holes are located in the insulating substrate. The plurality of second open pores are arranged around the primary winding and the secondary winding; the middle column is located in the first open hole, and the side column is located in the second open hole; wherein the middle column and the side columns comprise a non-metal magnetic material and a plastic packaging material. Compared with the prior art, the transformer can better concentrate and guide a magnetic field, the magnetic induction intensity is greatly improved, and therefore the efficiency and stability of the transformer are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics, and in particular to a manufacturing method of a transformer and a manufacturing method thereof. Background Art

[0002] Currently, most Bobbin transformers on the market use upper and lower covers as the magnetic core of the transformer. Since the transformer in the prior art only has upper and lower covers, the magnetic induction intensity of the transformer core is low. In order to ensure the performance of the transformer, the thickness of the upper and lower covers needs to be thickened or the area of ​​the upper and lower covers needs to be increased, which undoubtedly increases the volume of the transformer. This is unacceptable for manufacturing small-volume transformers. How to reduce the volume of the transformer while ensuring the performance of the transformer is a technical problem that urgently needs to be solved in this field. Summary of the invention

[0003] In view of this, the purpose of the embodiments of the present invention is to provide a transformer and a manufacturing method thereof, which can effectively solve the technical problem of reducing the volume of the transformer while ensuring the performance of the transformer in the prior art. Compared with the prior art, due to the addition of a middle column and a side column, the magnetic core of the transformer forms a closed magnetic circuit, which can greatly improve the magnetic induction intensity of the transformer. In addition, the magnetic core of the transformer is made of insulating magnetic material, which can ensure the withstand voltage of the transformer. That is to say, while ensuring the performance of the transformer, the solution of the present application can reduce the volume of the transformer.

[0004] In a first aspect, an embodiment of the present invention provides a transformer, comprising a primary winding and a secondary winding spaced apart from each other, and an insulating substrate covering the primary winding and the secondary winding, and also comprising a first opening and a plurality of second openings on the insulating substrate, the primary winding and the secondary winding surrounding the outside of the first opening, and the plurality of second openings surrounding the primary winding and the secondary winding; and also comprising a middle column located in the first opening, and a side column located in the second opening; wherein the middle column and the side column comprise non-metallic magnetic material and plastic packaging material.

[0005] Preferably, the non-metallic magnetic material is an insulating magnetic material.

[0006] Preferably, the insulating magnetic material is nickel-zinc ferrite material.

[0007] Preferably, it further comprises a first cover plate disposed on the first surface of the insulating substrate, wherein the first cover plate comprises an insulating magnetic material.

[0008] Preferably, it further comprises a second cover plate disposed on the second surface of the insulating substrate, wherein the second cover plate comprises an insulating magnetic material; and the first surface and the second surface are arranged opposite to each other.

[0009] Preferably, the material of the insulating substrate includes one or more of glass fiber, epoxy resin and polyimide.

[0010] Preferably, the plastic packaging material is set to be epoxy resin material.

[0011] Preferably, it also includes an external pin, and the external pin is electrically connected to the outlet of the winding.

[0012] Preferably, the organic material is plastic.

[0013] Preferably, the first cover plate and the second cover plate are made of powdered nickel-zinc ferrite by hot pressing.

[0014] Preferably, the first opening and the plurality of second openings pass through the insulating substrate.

[0015] Preferably, the first opening and the plurality of second openings on the insulating substrate are blind holes.

[0016] In the first aspect, an embodiment of the present invention provides a method for manufacturing a transformer, providing an insulating substrate; forming a primary winding and a secondary winding that are spaced apart in the insulating substrate, and making the insulating substrate cover the primary winding and the secondary winding; forming a first opening and a plurality of second openings on the insulating substrate, and making the primary winding and the secondary winding surround the outside of the first opening, and making the plurality of second openings surround the primary winding and the secondary winding; forming a center column in the first opening, and forming side columns in the plurality of second openings; wherein the center column and the side columns include non-metallic magnetic material and plastic packaging material.

[0017] Preferably, the non-metallic magnetic material is an insulating magnetic material.

[0018] Preferably, the insulating magnetic material is nickel-zinc ferrite material.

[0019] Preferably, the method further comprises forming a first cover plate on the first surface of the insulating substrate, wherein the first cover plate comprises an insulating magnetic material.

[0020] Preferably, the method further includes forming a second cover plate on the second surface of the insulating substrate, wherein the second cover plate includes an insulating magnetic material; and the first surface and the second surface are arranged opposite to each other.

[0021] Preferably, the material of the insulating substrate includes one or more of glass fiber, epoxy resin and polyimide.

[0022] Preferably, the plastic packaging material is set to be epoxy resin material.

[0023] Preferably, the method further comprises forming an external pin, wherein the external pin is electrically connected to the outlets of the primary winding and the secondary winding.

[0024] Preferably, the first opening and the plurality of second openings pass through the insulating substrate.

[0025] Preferably, the first opening and the plurality of second openings on the insulating substrate are blind holes.

[0026] The technical solution of the embodiment of the present invention, compared with the prior art, adds a middle column and a side column. The middle column, the side column and the cover plate described in the present application form a closed magnetic circuit. Compared with the transformer without a middle column or a side column in the prior art, it can better concentrate and guide the magnetic field, greatly improve the magnetic induction intensity, and thus improve the efficiency and stability of the transformer. In addition, the middle column and the side column are made of insulating magnetic materials, which can increase the magnetic induction intensity without affecting the withstand voltage of the transformer. That is to say, while ensuring the withstand voltage of the transformer, the magnetic induction intensity of the transformer is improved, thereby greatly reducing the size of the transformer. Thirdly, the technical solution of the embodiment of the present invention is produced in batches and then cut into independent transformers. During the production process, the windings of multiple transformers can be formed at the same time, saving process steps. Therefore, the technical solution of the embodiment of the present invention can shorten the manufacturing time of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0028] Figure 1a-1e is a structural diagram corresponding to some steps of a method for manufacturing a transformer according to an embodiment of the present invention;

[0029] Figure 2a is a structural diagram of a transformer in one embodiment of the present invention;

[0030] Figure 2b yes Figure 2a Transformer cross-section;

[0031] Figure 3 is a structural diagram of a transformer according to another embodiment of the present invention;

[0032] Figure 4 1 is a structural diagram of a transformer according to another embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the detailed description of the present invention below, some specific details are described in detail. It is possible for a person skilled in the art to fully understand the present invention without the description of these details. In order to avoid confusing the essence of the present invention, known methods, processes, flows, components and circuits are not described in detail.

[0034] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0035] At the same time, it should be understood that in the following description, "circuit" refers to a conductive loop composed of at least one element or subcircuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another element or an element / circuit is said to be "connected between" two nodes, it can be directly coupled or connected to another element or there can be an intermediate element, and the connection between the elements can be physical, logical, or a combination thereof. On the contrary, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there is no intermediate element between the two.

[0036] Unless the context clearly requires, the words "including", "etc." and similar words throughout the application should be interpreted as meaning rather than an exclusive or exhaustive meaning; that is, the meaning of "including but not limited to".

[0037] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0038] The present application provides a method for manufacturing a transformer. Figure 1a-1e FIG. 1 is a structural diagram corresponding to some steps of the method for manufacturing a transformer according to an embodiment of the present invention. Figure 1aAs shown, an insulating substrate 1 is provided, and a winding 2 is formed in the insulating substrate 1, wherein the winding 2 includes a primary winding and a secondary winding arranged at intervals, and the insulating substrate 1 covers the primary winding and the secondary winding; in this embodiment, 4 groups of primary windings and secondary windings in the horizontal direction and 4 groups of primary windings and secondary windings in the vertical direction are taken as examples. In other embodiments, the number of primary windings and secondary windings is not limited, and can be 4 groups in the horizontal direction and 5 groups in the vertical direction, or 5 groups in the horizontal direction and 5 groups in the vertical direction, etc., and can be set according to actual conditions. In this embodiment, the primary winding and the secondary winding are formed by the RDL (Redistrbution Layer) process. In this embodiment, since the 16 groups of windings 2 in the insulating substrate shown in the figure are formed at the same time, it is not necessary to make the 16 groups of windings 2 one by one in sequence, which can greatly shorten the production time of the transformer in terms of time.

[0039] A plurality of openings are formed on the insulating substrate 1, wherein a transformer includes a first opening 112 and a plurality of second openings 113, and the primary winding and the secondary winding are surrounded on the outside of the first opening, and the plurality of second openings are surrounded on all sides of the primary winding and the secondary winding; wherein the number of the second openings 113 may be 2, and the two second openings 113 are respectively placed on both sides of the primary winding and the secondary winding; wherein the number of the second openings 113 may also be 4, and the four second openings 113 are respectively placed on the primary winding and the four sides of the secondary winding; or the second openings 113 can be other numbers, the number of the second openings 113 is not limited, and can be set according to actual conditions. As an example, in this embodiment, the number of the second openings 113 is 4, and the 4 second openings 113 are respectively placed on the four sides of the primary winding and the secondary winding. In this embodiment, the shapes of the first opening 112 and the second opening 113 are not limited, and the shapes of the first opening 112 and the second opening 113 can be designed according to actual needs. The shape of the first opening 112 can be made as follows Figure 1a The shape of the second opening 113 can be made as follows: Figure 1a The rectangle shown in . Wherein, the material of the insulating substrate includes one or more of glass fiber, epoxy resin and polyimide.

[0040] A central column 41 is formed in the first opening 112 , and side columns 421 are formed in the plurality of second openings 113 ; wherein the central column 41 and the side columns 421 include non-metallic magnetic materials and plastic packaging materials.

[0041] As an example, Figure 1bAs shown, non-metallic magnetic materials and plastic encapsulation materials are placed in the first opening 112 and the second opening 113, and used as the middle column 41 and side column 421 of the magnetic core 4 of the transformer. In this embodiment, the middle column 41 and the side column 421 are made of plastic encapsulation materials and insulating magnetic materials. Specifically, in this embodiment, a mixture of powdered plastic encapsulation materials and powdered insulating magnetic materials is placed in the first opening 112 and the second opening 113, and then a hot pressing molding process is used to form the powdered plastic encapsulation materials and the powdered insulating magnetic materials into the middle column 41 and the side column 421. Further, the powdered plastic encapsulation includes one or more of epoxy resin, PCV material, PE material, PP material, and may also be other plastic encapsulation materials, which are not limited here. Also, the powdered insulating magnetic material may be a powdered nickel-zinc ferrite material, or may be other insulating magnetic materials, which are not limited here. In the actual production process, nickel-zinc ferrite may be changed to other insulating magnetic materials according to demand.

[0042] In other embodiments, the transformer further includes a first cover plate 3 formed on the first surface of the insulating substrate 1, wherein the first cover plate 3 includes an insulating magnetic material.

[0043] like Figure 1c As shown, a first cover plate 3 is formed on the first surface of the insulating substrate 1. In this embodiment, the first cover plate 3 is made of an insulating magnetic material. Specifically, the insulating magnetic material can be nickel-zinc ferrite, or other insulating magnetic materials, which are not limited here. In other embodiments, the method of forming the first cover plate 3 can be: hot pressing the nickel-zinc ferrite powder core material. In other embodiments, the method of forming the first cover plate 3 can also be: coating a layer of material containing nickel-zinc ferrite on the outside of the insulating plate. The insulating plate can be made of epoxy material or other insulating materials.

[0044] In this embodiment, the middle column 41, the side column 421 and the first cover plate 3 form a closed magnetic circuit. The closed magnetic circuit greatly increases the magnetic induction intensity of the transformer, improves the power density of the transformer, and greatly reduces the volume of the transformer. In addition, the middle column 41 and the side column 421 are made of insulating magnetic materials, which can increase the magnetic induction intensity of the transformer without affecting the withstand voltage of the transformer. In other words, the magnetic induction intensity of the transformer is increased while ensuring the withstand voltage of the transformer, thereby greatly reducing the volume of the transformer.

[0045] like Figure 1d As shown, the multiple transformers in the above steps are divided into several transformers. The specific division method is not limited here. After division, independent transformers are formed, and the side wall or bottom of each transformer exposes two ends of the primary winding and two ends of the secondary winding. Figure 1d In the figure, only two outlets are shown, and the other two outlets are on the opposite sides of the outlets 51 and 52. In other embodiments, the outlet position of the winding can be at the bottom of the transformer, which will not be repeated here.

[0046] The technical solution of the embodiment of the present invention is to batch produce transformers and then divide them into independent transformers. During the production process, the windings of multiple transformers can be formed at the same time, saving process steps. Therefore, the technical solution of the embodiment of the present invention can shorten the manufacturing time of the transformer.

[0047] In other embodiments, Figure 1e As shown, it also includes forming external pins 6 at the edge of the divided transformer; wherein the external pins 6 are electrically connected to the outlet of the winding 2. Two external pins 6 are electrically connected to the two outlets of the primary winding of the transformer, and the other two external pins 6 are electrically connected to the two outlets of the secondary winding of the transformer. The transformer winding can be outlet at the bottom or at the side, and there is no restriction on the outlet position of the transformer winding.

[0048] In other embodiments, a second cover plate 7 is formed on the second surface of the insulating substrate 1, wherein the second cover plate 7 includes an insulating magnetic material; the first surface and the second surface are arranged opposite to each other. Specifically, the insulating magnetic material can be nickel-zinc ferrite, or other insulating magnetic materials, which are not limited here. In other embodiments, the method of forming the second cover plate 7 can be: hot pressing the nickel-zinc ferrite powder core material. In other embodiments, the method of forming the second cover plate 7 can also be: coating a layer of material containing nickel-zinc ferrite on the outside of the insulating plate, and the insulating plate can be made of epoxy material or other insulating materials. That is to say, the second cover plate 7 is covered at the bottom of the substrate 1. In this embodiment, the middle column 41, the side column 421, the first cover plate 3 and the second cover plate 7 form a closed magnetic circuit. The closed magnetic circuit greatly increases the magnetic induction intensity of the transformer, improves the power density, and greatly reduces the volume of the transformer.

[0049] In other embodiments, the second cover plate 7 is the same as the first cover plate 3; the same here means that the shape and size of the second cover plate 7 are the same as the first cover plate 3, and the material is also the same as the first cover plate 3. Therefore, the first cover plate 3 and the second cover plate 7 can be mass-produced without changing the size, and there is no situation of reverse or wrong installation during the assembly of the transformer, which can greatly save the production time of the transformer.

[0050] In other embodiments, the first opening 112 and the plurality of second openings 113 pass through the insulating substrate. That is, the middle column 41 and the side column 421 formed in the first opening 112 and the plurality of second openings 113 can contact the first cover plate 3 and the second cover plate 7 respectively, that is, the middle column 41, the side column 421 and the first cover plate 3 and the second cover plate 7 form a closed magnetic circuit, and the closed magnetic circuit greatly increases the magnetic induction intensity of the transformer, improves the power density, and greatly reduces the volume of the transformer.

[0051] In other embodiments, the first opening 112 and the plurality of second openings 113 are blind holes on the insulating substrate. That is, the middle column 41 and the side column 421 formed in the first opening 112 and the plurality of second openings 113 can contact with one of the first cover plate 3 or the second cover plate 7, that is, the middle column 41, the side column 421 and the first cover plate 3 or the second cover plate 7 form a closed magnetic circuit. Compared with the transformer in the prior art, which has no middle column but only the first cover plate 3 or the second cover plate 7, the closed magnetic circuit greatly increases the magnetic induction intensity of the transformer, improves the power density, and greatly reduces the volume of the transformer.

[0052] In a second aspect, the present application further provides a transformer, specifically, Figure 2a The structure diagram of the transformer of one embodiment of the present application is shown. Figure 2b yes Figure 2a Transformer cross-section diagram, such as Figure 2a and 2b As shown, the transformer of the present application is manufactured by adopting the manufacturing method of the transformer of the first aspect.

[0053] like Figure 2a As shown, for the sake of convenience, the first cover plate 3 and the magnetic core part are hidden in this figure, and only the winding 2, the winding end 51, the winding end 52, the insulating substrate 1 and the external pin 6 are shown. Specifically, the transformer includes: a primary winding and a secondary winding arranged at intervals from each other, and an insulating substrate 1 covering the primary winding and the secondary winding, and also includes a first opening and a plurality of second openings located on the insulating substrate 1, the primary winding and the secondary winding surround the outside of the first opening, and the plurality of second openings surround the primary winding and the secondary winding; and also includes a middle column located in the first opening, and a side column located in the second opening; wherein the middle column and the side column include non-metallic magnetic material and plastic packaging material.

[0054] In other embodiments, Figure 2a and 2bAs shown, the transformer includes a winding 2 arranged in an insulating substrate 1, wherein the winding 2 includes a primary winding and a secondary winding arranged at intervals from each other, and also includes a middle column of a magnetic core arranged inside the winding 2 and side columns of a magnetic core arranged around the winding 2; Figure 2b As shown, for the sake of convenience, the magnetic core part is not shown in this figure, and the transformer also includes a first cover plate 3 covering the first surface of the insulating substrate 1 and a second cover plate 7 covering the second surface, and external pins 6 arranged around the transformer, wherein the external pins are electrically connected to the outlets of the primary winding and the secondary winding respectively. In this embodiment, only the primary winding 21, the secondary winding 22, the first cover plate 3, the substrate 1, the external pins 6 and the second cover plate 7 are shown. In this embodiment, the winding is made by RDL electroplating process, and the winding is made of copper material. In other embodiments, the winding can also be other metals such as gold and silver, and the material of the winding is not limited here. The insulating substrate 1 is made of one or more of glass fiber, epoxy resin and polyimide; the middle column and the side column are made of a plastic encapsulation material and an insulating magnetic material; in the present embodiment, specifically, a mixture of powdered plastic encapsulation material and powdered insulating magnetic material can be placed in the first opening 112 and the second opening 113, and then, a hot pressing molding process is used to form the powdered plastic encapsulation material and the powdered insulating magnetic material into a middle column and a side column. In other embodiments, other processes can also be used to mix organic materials and insulating magnetic materials to form the middle column and the side column, which is not limited here. The first cover plate 3 is made of an insulating magnetic material; the insulating magnetic material can be nickel-zinc ferrite or other insulating magnetic materials, which is not limited here.

[0055] In this embodiment, the middle column, the side columns, the first cover plate 3 and the second cover plate 7 form a closed magnetic circuit. The closed magnetic circuit greatly increases the magnetic induction intensity of the transformer, improves the power density of the transformer, and greatly reduces the size of the transformer.

[0056] Figure 3 FIG. 1 shows a structural diagram of a transformer according to another embodiment of the present application. Figure 3 As shown, in this embodiment, the side column can be as follows Figure 1bThe four side columns shown in the figure surround the winding 2. In other embodiments, the number of side columns can also be two, which are respectively arranged on both sides of the transformer winding 2. In other embodiments, the first opening and the plurality of second openings are blind holes on the insulating substrate. The depth of the blind hole is greater than the height of the winding in the depth direction of the blind hole. That is to say, the middle column and the side column formed in the first opening and the plurality of second openings can also extend to the bottom of the insulating substrate 1. In other words, the middle column and the side column extend to the bottom of the insulating substrate 1 and form an integral magnetic component with the first cover plate 3. This can improve the magnetic induction intensity of the transformer. The transformer also includes an external pin 6, which is arranged on the side surface and the bottom surface of the transformer. The external pin 6 is electrically connected to the outlet of the primary winding and the secondary winding of the transformer respectively. In this embodiment, the coils of the primary winding and the secondary winding are laminated coils. In other embodiments, the coils of the primary winding and the secondary winding of the transformer can also be coils of other forms, and the form of the coil is not limited here.

[0057] Figure 4 FIG. 1 shows a structural diagram of a transformer according to another embodiment of the present application. Figure 4 As shown, in this embodiment, the first opening and the second opening pass through the insulating substrate, that is, the middle column and the side column formed by the first opening and the second opening can be directly overlapped on the first cover plate 3 and the second cover plate 7, and the middle column, the side column and the first cover plate 3 and the second cover plate 7 form a closed magnetic circuit. Due to the closed magnetic circuit, the magnetic induction intensity of the transformer is greatly increased, the power density is improved, and the volume of the transformer is greatly reduced.

[0058] Compared with the prior art, a center column and side columns are added. In the present application, the center column, side columns and cover plates form a closed magnetic circuit. Compared with the transformer without a center column or side columns in the prior art, the magnetic field can be better concentrated and guided, and the magnetic induction intensity is greatly improved, thereby improving the efficiency and stability of the transformer. In addition, the center column and side columns are made of insulating magnetic materials, which can increase the magnetic induction intensity without affecting the withstand voltage of the transformer. That is to say, the magnetic induction intensity of the transformer is improved while ensuring the withstand voltage of the transformer, thereby greatly reducing the size of the transformer.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be within the protection scope of the present invention.

Claims

1. A transformer, characterized in that: It includes a primary winding and a secondary winding which are spaced apart from each other. and an insulating substrate covering the primary winding and the secondary winding, It also includes a first opening and a plurality of second openings located on the insulating substrate, the primary winding and the secondary winding are surrounded on the outside of the first opening, and the plurality of second openings are surrounded on all sides of the primary winding and the secondary winding; and Also includes a center column located in the first opening, and The side columns are located in the second opening; wherein the middle column and the side columns include non-metallic magnetic materials and plastic packaging materials.

2. The transformer according to claim 1, characterized in that: The non-metallic magnetic material is an insulating magnetic material.

3. The transformer according to claim 2, characterized in that: The insulating magnetic material is nickel-zinc ferrite material.

4. The transformer according to claim 1, characterized in that: The invention also includes a first cover plate disposed on the first surface of the insulating substrate, wherein the first cover plate includes an insulating magnetic material.

5. The transformer according to claim 4, characterized in that: It also includes a second cover plate placed on the second surface of the insulating substrate, wherein the second cover plate includes an insulating magnetic material; the first surface and the second surface are arranged opposite to each other.

6. The transformer according to claim 1, characterized in that: The material of the insulating substrate includes one or more of glass fiber, epoxy resin and polyimide.

7. The transformer according to claim 1, characterized in that: The plastic packaging material is set to be epoxy resin material.

8. The transformer according to claim 1, characterized in that: It also includes an external pin, which is electrically connected to the outlet of the winding.

9. The transformer according to claim 6, characterized in that: The organic material is plastic.

10. The transformer according to claim 5, characterized in that: The first cover plate and the second cover plate are made of powdered nickel-zinc ferrite by hot pressing.

11. The transformer according to claim 1, characterized in that: The first opening and the plurality of second openings pass through the insulating substrate.

12. The transformer according to claim 1, characterized in that: The first opening and the plurality of second openings are blind holes on the insulating substrate.

13. A method for manufacturing a transformer, characterized in that: providing an insulating substrate; Forming a primary winding and a secondary winding that are spaced apart in the insulating substrate, and making the insulating substrate cover the primary winding and the secondary winding; A first opening and a plurality of second openings are formed on the insulating substrate, and the primary winding and the secondary winding are surrounded outside the first opening, and the plurality of second openings are surrounded around the primary winding and the secondary winding; forming a center column in the first opening, and forming side columns in the plurality of second openings; Wherein, the middle column and the side columns include non-metallic magnetic materials and plastic packaging materials.

14. The method for manufacturing a transformer according to claim 13, characterized in that: The non-metallic magnetic material is an insulating magnetic material.

15. The method for manufacturing a transformer according to claim 14, characterized in that: The insulating magnetic material is nickel-zinc ferrite material.

16. The method for manufacturing a transformer according to claim 13, characterized in that: The method also includes forming a first cover plate on the first surface of the insulating substrate, wherein the first cover plate includes an insulating magnetic material.

17. The method for manufacturing a transformer according to claim 16, characterized in that: The invention also includes forming a second cover plate on the second surface of the insulating substrate, wherein the second cover plate includes an insulating magnetic material; and the first surface and the second surface are arranged opposite to each other.

18. The method for manufacturing a transformer according to claim 13, characterized in that: The material of the insulating substrate includes one or more of glass fiber, epoxy resin and polyimide.

19. The method for manufacturing a transformer according to claim 13, characterized in that: The plastic packaging material is set to be epoxy resin material.

20. The method for manufacturing a transformer according to claim 13, characterized in that: It also includes forming external pins, which are electrically connected to the outlets of the primary winding and the secondary winding.

21. The method for manufacturing a transformer according to claim 13, characterized in that: The first opening and the plurality of second openings pass through the insulating substrate.

22. The method for manufacturing a transformer according to claim 13, characterized in that: The first opening and the plurality of second openings are blind holes on the insulating substrate.

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