CN-119108200-B - Plastic package type magnetic device and preparation method thereof

CN119108200BCN 119108200 BCN119108200 BCN 119108200BCN-119108200-B

Abstract

The application relates to the technical field of magnetic devices and discloses a plastic package type magnetic device and a preparation method thereof, wherein the preparation method of the plastic package type magnetic device comprises the steps of laminating partially laminated coils to form a first winding, and the outer surface of the first winding is provided with a plurality of first thimble positioning areas; the method comprises the steps of forming a first winding, forming a first sealing colloid by adopting an injection molding material to perform primary injection molding on the first winding, wrapping or partially wrapping a region of the first winding except for a first thimble positioning region by the first sealing colloid, forming a second winding by adopting a coil laminated by a lamination part, forming a plurality of second thimble positioning regions on the outer surface of the second winding, performing primary injection molding on the second winding by adopting the injection molding material to form a second sealing colloid, wrapping or partially wrapping the first sealing colloid and wrapping or partially wrapping a region of the second winding except for the second thimble positioning region by the second sealing colloid, and assembling the first winding and the second winding in a containing cavity of a magnetic core main body. The application improves the reliability of the device.

Inventors

CAI JINBO
LEI XIAODONG
ZHANG ZHOU

Assignees

东莞顺络功率器件有限公司

Dates

Publication Date: 20260508
Application Date: 20240927

Claims (9)

1. The preparation method of the plastic package type magnetic device is characterized by comprising the following steps of: Providing a plurality of coils, forming a first winding by laminating the coils, wherein the outer surface of the first winding is provided with a plurality of first thimble positioning areas serving as injection molding positioning points; Carrying out primary injection molding on the first winding by adopting an injection molding material to form a first sealing colloid, wherein the first sealing colloid wraps or partially wraps the area of the first winding except for the first thimble positioning area; The coils partially laminated on the first sealing colloid are pressed to form a second winding, and the outer surface of the second winding is provided with a plurality of second thimble positioning areas serving as injection molding positioning points; Carrying out primary injection molding on the second winding by adopting the injection molding material to form a second sealing colloid, wherein the second sealing colloid wraps or partially wraps the first sealing colloid, and wraps or partially wraps the second winding in a region except for the second thimble positioning region; Performing one-time injection molding on the second sealing colloid at least once by adopting the injection molding material to form a sealing colloid, wherein the sealing colloid wraps the second sealing colloid, the second winding, the first sealing colloid and the first winding; The first winding and the second winding are assembled in the accommodating cavity of the magnetic core main body, and the vertical projection areas of the first thimble positioning area and the second thimble positioning area relative to the magnetic core main body are not in the same position.
2. The method of manufacturing a plastic encapsulated magnetic device as set forth in claim 1, wherein said assembling said first winding and said second winding in said receiving cavity of said core body further comprises: laminating part of the laminated coils on the second sealing colloid to form an extension winding, wherein the outer surface of the laminated extension winding is provided with a plurality of extension thimble positioning areas; and carrying out primary injection molding on the extension winding by adopting the injection molding material to form an extension sealing colloid, wherein the extension sealing colloid wraps or partially wraps the second sealing colloid, and wraps or partially wraps the extension winding except for the area of the extension thimble positioning area.
3. The method of manufacturing a plastic package magnetic device according to claim 1, wherein the accommodating cavity of the magnetic core body is provided with a magnetic pillar, the first winding and the second winding are sleeved and connected on the magnetic pillar, the first winding is provided with a first lead end, the second winding is provided with a second lead end, and the first lead end and the second lead end extend out of the magnetic core body in opposite directions.
4. The method of manufacturing a plastic encapsulated magnetic device as set forth in claim 1, wherein a plurality of said first pin-positioning areas are uniformly arranged on an outer surface of said first winding and a plurality of said second pin-positioning areas are uniformly arranged on an outer surface of said second winding.
5. The method of manufacturing a plastic encapsulated magnetic device of claim 1, wherein a lamination gap is provided between adjacent ones of the first winding and the second winding, the lamination gap being less than or equal to 10% of a thickness of the coil.
6. The method of manufacturing a plastic encapsulated magnetic device as set forth in claim 1, wherein said first encapsulant covers at least 10% of the surface area of said first winding and said second encapsulant covers at least 10% of the surface area of said second winding.
7. The method of manufacturing a plastic encapsulated magnetic device as claimed in claim 1, wherein the thickness of the first encapsulant and/or the second encapsulant is greater than or equal to 0.3mm.
8. The method of manufacturing a plastic encapsulated magnetic device as recited in claim 1, wherein the injection molding material comprises at least one of polyethylene terephthalate, acrylonitrile-butadiene-styrene copolymer, polyamide, or polycarbonate, and the injection molding materials of the first encapsulant and the second encapsulant are different.
9. A plastic-encapsulated magnetic device, applied to the method for manufacturing a plastic-encapsulated magnetic device as set forth in any one of claims 1 to 8, comprising: the magnetic core main body is internally provided with an accommodating cavity; The coils are partially laminated and then pressed to form a first winding, and the outer surface of the first winding is provided with a plurality of first thimble positioning areas; The first sealing colloid wraps or partially wraps the area of the first winding except the first thimble positioning area, the coils partially laminated on the first sealing colloid form a second winding, and the outer surface of the second winding is provided with a plurality of second thimble positioning areas; the second sealing colloid wraps or partially wraps the first sealing colloid and wraps or partially wraps the second winding in a region except the second thimble positioning region; wherein the first winding and the second winding are connected in the accommodating cavity.

Description

Plastic package type magnetic device and preparation method thereof Technical Field The application relates to the technical field of magnetic devices, in particular to a plastic package type magnetic device and a preparation method thereof. Background The magnetic device is a key electronic component for realizing energy conversion, transmission and storage by utilizing an electromagnetic induction principle, is widely applied to the fields of power management, signal processing, electromagnetic compatibility and the like, comprises a transformer, an inductor and the like, can comprise a magnetic core, a coil, a framework, a terminal, a package and the like on a specific structure, is a magnetic device in related technology, and is required to be changed along with the development of the electronic industry, the application voltage of a product is higher and higher, a transformer product is taken as an example, the insulation of the product mainly depends on insulation of a wire insulation layer and an adhesive tape, so that the insulation capability of the product is insufficient, and the temperature of the product is increased, the partial discharge is serious, the reliability of the device is influenced and the situation needs to be changed under the high-voltage and high-frequency environment. Disclosure of Invention In view of the above, the present application provides a plastic package magnetic device and a method for manufacturing the same, so as to solve the above-mentioned technical problems. To achieve the above object, according to a first aspect, the following technical solution is adopted: A preparation method of a plastic package type magnetic device comprises the following steps: Providing a plurality of coils, forming a first winding by laminating the coils partially, wherein the outer surface of the first winding is provided with a plurality of first thimble positioning areas; Carrying out primary injection molding on the first winding by adopting an injection molding material to form a first sealing colloid, wherein the first sealing colloid wraps or partially wraps the area of the first winding except for the first thimble positioning area; the coils partially laminated on the first sealing colloid are pressed to form a second winding, and the outer surface of the second winding is provided with a plurality of second thimble positioning areas; Carrying out primary injection molding on the second winding by adopting the injection molding material to form a second sealing colloid, wherein the second sealing colloid wraps or partially wraps the first sealing colloid, and wraps or partially wraps the second winding in a region except for the second thimble positioning region; the first winding and the second winding are assembled in the accommodating cavity of the magnetic core main body. The application is further arranged such that before said assembling of said first winding and said second winding in the receiving cavity of the core body, it further comprises: And carrying out one-time injection molding on the second sealing colloid at least once by adopting the injection molding material to form a sealing colloid, wherein the sealing colloid wraps the second sealing colloid, the second winding, the first sealing colloid and the first winding. The application is further arranged such that before said assembling of said first winding and said second winding in the receiving cavity of the core body, it further comprises: laminating part of the laminated coils on the second sealing colloid to form an extension winding, wherein the outer surface of the laminated extension winding is provided with a plurality of extension thimble positioning areas; and carrying out primary injection molding on the extension winding by adopting the injection molding material to form an extension sealing colloid, wherein the extension sealing colloid wraps or partially wraps the second sealing colloid, and wraps or partially wraps the extension winding except for the area of the extension thimble positioning area. The application is further characterized in that the accommodating cavity of the magnetic core main body is provided with a magnetic column, the first winding and the second winding are sleeved and connected on the magnetic column, the first winding is provided with a first lead end, the second winding is provided with a second lead end, and the first lead end and the second lead end extend out of the magnetic core main body in opposite directions. The application further provides that the plurality of first thimble positioning areas are uniformly arranged on the outer surface of the first winding, and the plurality of second thimble positioning areas are uniformly arranged on the outer surface of the second winding, wherein the vertical projection areas of the first thimble positioning areas and the second thimble positioning areas relative to the magnetic core main body are not in the same position