Copper sheet embedded soft magnetic powder core inductor as well as preparation method and application thereof

Abstract

The invention relates to a copper sheet embedded soft magnetic powder core inductor and a preparation method and application thereof. The copper sheet embedded soft magnetic powder core inductor comprises a copper sheet, the surface of the copper sheet is covered with a soft magnetic material, and the interface of the soft magnetic material and the copper sheet contains an insulating resin material; the copper sheet embedded soft magnetic powder core inductor has the characteristics of high density, high magnetic core permeability, high inductance value, high saturation flux density, small size and less magnetic flux leakage; and the copper sheet embedded soft magnetic powder core inductor replacing ferrite inductor with the same inductance is used in a low-voltage DC / DC converter circuit,the copper sheet embedded soft magnetic powder core inductor can obtain consistent or higher efficiency, and meanwhile, the size of the inductor can be reduced by more than half. The withstand voltage of the copper sheet embedded soft magnetic powder core inductor can reach more than 15V, and the preparation method of the copper sheet embedded soft magnetic powder core inductor is simple, high inproduction efficiency and suitable for large-scale automatic production.

Description

technical field [0001] The invention belongs to the field of electronic technology, and relates to a copper sheet embedded soft magnetic powder core inductor, a preparation method and application thereof. Background technique [0002] In recent years, with the high-speed development of semiconductor devices, the demand for inductors has evolved towards high efficiency, low inductance, miniaturization, and high current. Subsequently, the requirements for soft magnetic materials are low loss, high permeability and high saturation flux density. Currently, common inductors include integrated inductors and ferrite inductors. [0003] Among them, the integrally formed inductor mixes and refines metal magnetic powder and resin, and then integrally molds it with a metal coil to produce an inductor. The disadvantages such as small volume ratio make it difficult to obtain high magnetic permeability compared with ferrite inductors, so that it is difficult to achieve the required indu...

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Problems solved by technology

[0003] Among them, the integrally formed inductor mixes and refines metal magnetic powder and resin, and then integrally molds it with a metal coil to produce an inductor. The disadvantages such as small volume ratio make it difficult to obtain high magnetic permeability compared with ferrite inductors, so that it is difficult to achieve the required inductance. It is necessary to increase the inductance by adding coils, resulting in a larger inductance DCR , larger copper loss

Although the ferrite inductor has high magnetic permeability, but the saturation magnetic flux density is small, it is necessary to open an air gap to prevent saturation, which leads to related problems such as magnetic flux leakage, and is prone to local temperature rise and low loop efficiency during use. adverse phenomenon; in addition, the large volume of ferrite inductors has also become one of the key factors limiting its application

[0004] CN107768069A discloses an inductor and a manufacturing method thereof. The manufacturing method of the inductor includes the following steps: S1, making a magnetic core, pressing granulated magnetic powder into a high-density block, cutting it into a magnetic core structure, and sintering it densely; The magnetic core includes a central column and two leaf pendulums; S2, winding the coil: winding the coil on the central column, after winding, the section of the coil is parallel to the length and height plane of the inductor, and the coil The two lead ends are located on both sides of the center column and are on the same plane; S3, compression molding: fill a layer of the granulated magnetic powder at the bottom of the mold for pre-compression and densification, and then plant the magnetic core wound with the coil in step S2 into the mold; after implantation, fill the mold with the granulated magnetic powder for compression molding; S4, semi-finished product heat treatment; S5, terminal electrode production; the inductance obtained by this scheme has low pressing pressure and low heat treatment temperature. The inductance of the product is low , Small magnetic flux density and large loss

[0005] CN107275045A discloses a method for manufacturing an inductor and a method for preparing its plastic sealing material, wherein the method for preparing the plastic sealing material comprises mixing 60% to 90% by weight of powder and 10% to 40% by weight of epoxy The resin is evenly mixed, and then the mixed material is pressed into a lump material, which is refrigerated at -5~0°C, which is the plastic sealing material of the inductor, and the powder is nickel-zinc ferrite powder, manganese-zinc ferrite powder One or more of powder, sendust powder, sendust powder; the manufacturing method of the inductor, including welding and connecting the magnetic core wound with enamelled copper wire to the lead frame, and then using the aforementioned plastic sealing material Injection molding is carried out to produce an inductor. The inductor obtained by this scheme has the problems of low specific gravity of soft magnetic powder and low molding pressure, resulting in low magnetic flux density and large loss.

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