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Ferrite material, small high-current laminated chip broadband magnetic bead and its preparation method

A ferrite material and ferrite technology, applied in the field of inductance, can solve the problems of small frequency range, long production cycle, and low current resistance of magnetic beads, and achieve the ability to suppress electromagnetic interference, improve production efficiency, and reduce parasitic capacitance. Effect

Active Publication Date: 2015-08-26
SHENZHEN ZHENHUA FU ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcomings of the existing ferrite material made of magnetic beads with small frequency range and low current resistance, and provide a ferrite material
[0006] Another object of the present invention is to provide a manufacturing method of a small-scale high-current laminated broadband magnetic bead, which overcomes the shortcomings of long production cycle and low efficiency in the manufacture of laminated broadband magnetic beads in the prior art
[0007] Another object of the present invention is to provide a small high-current laminated chip broadband magnetic bead, which overcomes the shortcomings of the magnetic bead in the prior art, such as small frequency range and low current resistance

Method used

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  • Ferrite material, small high-current laminated chip broadband magnetic bead and its preparation method
  • Ferrite material, small high-current laminated chip broadband magnetic bead and its preparation method
  • Ferrite material, small high-current laminated chip broadband magnetic bead and its preparation method

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preparation example Construction

[0034] S01. Preparation of ferrite slurry: mix the ferrite material of the above formula with solvent, binder and plasticizer by ball milling to prepare ferrite slurry; wherein, the ferrite material, solvent, binder The weight ratio of agent and plasticizer is (55~59): (34~38): (4~6): (1~3);

[0035] S02. Preparation of material tape by dry method: apply the ferrite slurry prepared in step S01 on the surface of PET release film by scraper molding method, and dry to obtain a ferrite film material tape;

[0036] S03. Cutting and perforating the ferrite material sheet: cutting the ferrite film material strip prepared in step S02 into multiple ferrite material sheets, and opening a lead-out hole and connection on each piece of the ferrite material sheet Holes, and in two adjacent ferrite sheets, according to the lamination design structure sequence of the ferrite diaphragm of the magnetic bead, the lead-out hole on one ferrite sheet corresponds to the connection hole position of t...

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Abstract

The invention discloses a ferrite material, small large-current laminated-chip wideband magnetic beads, and a preparation method thereof. The ferrite main materials comprise: 49-55mol% of Fe2O3, 25-35mol% of ZnO, 4-8mol% of CuO, 8-15mol% of NiO, 0.1-0.6mol% of Co3O4, 1-3mol% of Bi2O3, and 0.5-1.5mol% of Nb2O5. The magnetic bead preparation method comprises the steps of ferrite slurry preparation, material band dry preparation, cutting, ferrite material sheet punching, ferrite material sheet printing, ferrite material sheet lamination, cutting and forming, and the like. With the ferrite material, magnetic saturation degree is improved, and direct current resistance is reduced, such that larger current can be withstood. According to the magnetic bead preparation method, production period is shortened, and production efficiency is improved. The volume of the magnetic beads is small. The magnetic beads have good electromagnetic interference inhibition capacity from 100MHz to higher than 1GHz.

Description

technical field [0001] The invention belongs to the technical field of inductance, and in particular relates to a ferrite material, a small-sized high-current lamination-type broadband magnetic bead and a preparation method thereof. Background technique [0002] Magnetic beads are electronic components used to suppress high-frequency noise and spike interference on signal lines and power lines, and to absorb static pulses. With the development of high-speed digital circuits, the clock frequency is getting higher and higher, and it is required to expand the frequency range of electromagnetic interference to a wide frequency band, up to 1GHz or more. The pulse shape of the high-speed digital signal is steeper, so that the fundamental frequency increases. Therefore, chip ferrite beads that are required to be loaded into high-speed digital circuits must meet the following requirements: keep low impedance |Z| in the frequency band below 100MHz, so as not to cause distortion of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26H01F1/34H01F37/00
Inventor 沈奇杰李建辉樊应县刘季超明建华
Owner SHENZHEN ZHENHUA FU ELECTRONICS
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