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A Low Power Consumption, High DC Bias Core and Its Application

A high DC bias, low power consumption technology, applied in magnetic core manufacturing, inductor/transformer/magnet manufacturing, preventing/reducing unwanted electrical/magnetic effects, etc. Increase energy consumption and other problems, achieve low power consumption, eliminate hysteresis loss and residual loss, and reduce eddy current loss

Active Publication Date: 2022-06-14
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional magnetic core uses ferromagnetic material, which produces hysteresis loss, eddy current loss and residual loss under the alternating magnetic field, which reduces the efficiency of the device and increases the energy consumption
At the same time, when traditional devices work in a DC bias state, the ferromagnetic core is rapidly saturated by magnetization, and the performance deteriorates rapidly, resulting in component failure

Method used

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  • A Low Power Consumption, High DC Bias Core and Its Application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of the present embodiment of a low-power, high DC bias core, comprising the following steps:

[0024] (1) The synthesis of manganese-zinc ferrite nanoparticles by high-temperature pyrolysis method, with a particle diameter of 20 nanometers;

[0025] (2) Ethyl orthosilicate hydrolysis method was used to uniformly coat the surface of manganese zinc ferrite nanoparticles with a layer of silicon oxide, with a thickness of 5 nanometers;

[0026] (3) Using the discharge plasma sintering method, the above-mentioned manganese zinc ferrite nanoparticles coated with silica are rapidly sintered at 600 °C to ensure that the particle size is not long, and the core is obtained after consolidation. as Figure 1 As shown, the bright part of the figure is a non-magnetic insulating matrix (i.e., silicon oxide), and the dark part is a manganese-zinc ferrite nanoparticle.

[0027] Among them, the volume fraction of manganese-zinc ferrite nanoparticles in the core is 75%. ...

Embodiment 2

[0031] The preparation method of the present embodiment of a low-power, high DC bias core, comprising the following steps:

[0032] (1) Iron-nickel nanoparticles are synthesized by DC arc plasma method, and the particle diameter is 8 nanometers;

[0033] (2) The butyl titanate hydrolysis method is used to uniformly coat the surface of the iron-nickel nanoparticles with a layer of titanium oxide, with a thickness of 2 nanometers;

[0034] (3) The hot pressing sintering method is adopted to hot press sinter the above-mentioned iron-nickel nanoparticles coated with titanium oxide at 800 °C to ensure that the particle size is not long, and the core is obtained after consolidation.

[0035] Among them, the volume fraction of manganese-zinc ferrite nanoparticles in the core is 65%.

[0036] After testing, the resistivity of the consolidated core material is 0.8×10 4 μΩ·cm, permeability of 200, DC bias performance of 80% (100mT), loss at 500KHz, 150mT is 220KW / m 3 , below 300KW / m at 1MHz...

Embodiment 3

[0039] The preparation method of the present embodiment of a low-power, high DC bias core, comprising the following steps:

[0040] (1) The iron nanoparticles are synthesized by thermal reduction method, and the particle diameter is 6 nanometers;

[0041] (2) Disperse iron nanoparticles in liquid phenolic resin;

[0042] (3) Heating up to 300 ° C, the phenolic resin solidifies, the iron nanoparticles are uniformly coated by the phenolic resin, and the nanoparticles are not large in size, and the core is obtained after consolidation.

[0043] Among them, the volume fraction of iron nanoparticles in the magnetic core is 50%.

[0044] After testing, the resistivity of the consolidated core material is 3×10 5 μΩ·cm, permeability of 70, DC bias performance of 63% (100mT), loss at 500KHz, 150mT is 340KW / m 3 , below 430KW / m at 1MHz, 10mT 3 , at 3MHz, 50mT below 255KW / m 3 , at 10MHz, 5mT below 43KW / m 3 。

[0045] The core of the present embodiment can achieve low power consumption and high ...

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Abstract

The invention belongs to the technical field of electronic components, and in particular relates to an ultra-low power consumption, high DC bias magnetic core, which comprises a non-magnetic insulating matrix and magnetic nanoparticles dispersed in the non-magnetic insulating matrix. The ultra-low power consumption and high DC bias magnetic core of the present invention is formed by dispersing magnetic nanoparticles in a nonmagnetic insulating matrix; the nonmagnetic insulating matrix can effectively prevent electron conduction and significantly reduce eddy current loss; at the same time, superparamagnetic nanoparticles It has a linear magnetization curve and has excellent resistance to DC bias.

Description

Technical field [0001] The present invention belongs to the field of electronic component technology, specifically relates to a low-power, high DC bias core and preparation method thereof, application. Background [0002] The core is the core material of electronic components such as transformers, inductors, transformers, filters, etc., and is the key material of electronic equipment such as power supplies, which is extremely important to the electronics industry. When the above electronic components are operated, an alternating magnetic field is generated in the core, which creates a constantly changing magnetic field line. The traditional core uses ferromagnetic materials, which produce hysteresis loss, eddy current loss and residual loss under the alternating magnetic field, which reduces the efficiency of the device and increases the energy consumption. At the same time, when the traditional device works in the DC bias state, the ferromagnetic core is rapidly saturated by mag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F27/255H01F27/34H01F41/02
CPCH01F27/255H01F27/34H01F41/0246H01F41/0206H01F2027/348
Inventor 白国华李忠张雪峰严密
Owner HANGZHOU DIANZI UNIV
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