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Amorphous compound magnetic core and preparation method thereof

A technology of amorphous alloy and magnetic core, which is applied in the field of amorphous composite magnetic core and its preparation, can solve the problems of low transient impedance, easy damage of switching devices, low magnetic permeability, etc., and achieve the solution of transient current distortion, The effect of improving the power factor of the power supply and increasing the initial magnetic permeability

Inactive Publication Date: 2017-05-10
JIANGXI AITE MAGNETS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are mainly two types of problems in the application process of switching power supplies: 1. The efficiency cannot be balanced under different loads: the electrical equipment will not run at full load with rated power for 24 hours, and it will be in standby state for part of the time, while the active PFC design The main design will be made for more than 50% load, resulting in low efficiency of the power supply at light load
2. The active PFC in the intermittent working mode or the alternating large current on the inductive load will cause the switching device to be easily damaged, the switching loss will increase, the reactive power consumption will increase, and the efficiency of the whole machine will be reduced.
The magnetic core in the prior art is made of various soft magnetic alloy powders, so it has countless small air gaps evenly distributed, which determines that it has a strong anti-saturation ability, that is, it can not be saturated under high current. However, due to the distributed air gap, the magnetic permeability is low, generally not more than 200, and the transient impedance is low

Method used

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Examples

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preparation example Construction

[0028] The present invention also provides a preparation method of the amorphous composite magnetic core according to the above technical solution, comprising the following steps:

[0029] (1) mixing the magnetic amorphous alloy powder with the insulating coating agent to obtain a mixed material;

[0030] (2) molding the mixture obtained in the step (1) and the ferrite core, so that the mixture is coated on the surface of the ferrite core to obtain a blank;

[0031] (3) preheating the green body obtained in the step (2) to obtain an amorphous composite magnetic core precursor;

[0032] (4) annealing the amorphous composite magnetic core precursor obtained in the step (3) to obtain an amorphous composite magnetic core.

[0033] In the present invention, the magnetic amorphous alloy powder is mixed with an insulating coating agent to obtain a mixed material. In the present invention, the mixing temperature is preferably 15-130°C, more preferably 25-100°C, and most preferably 5...

Embodiment 1

[0044] Mixing 1K101 magnetic amorphous alloy powder with a weight of 150 mesh and a weight of 27.65g, 1g phosphoric acid, 1g sodium silicate and 0.35g kaolin at room temperature for 5min at a change rate of 5-60r / min to obtain a mixture;

[0045] Put 20g of the mixed material into the mold of OD33.02mm×ID19.9mm×HT15mm, then put 3g of nickel-zinc ferrite powder core with the size of OD30mm×ID25mm×HT3mm into the mold, and finally put the remaining 10g of the mixed material into the mold. into the mold, the pressure reaches 21t / cm 2 After holding for 10s, the blank is obtained by unmolding;

[0046] Under the condition of vacuum degree of 0.08Pa, the green body is preheated at 200℃ for 50min to obtain an amorphous composite magnetic core precursor;

[0047] Under the same vacuum conditions, the amorphous composite magnetic core was obtained at a constant temperature of 420° C. for 60 minutes, followed by cooling in the furnace.

Embodiment 2

[0049] Mixing 250 mesh 1K101 magnetic amorphous alloy powder with a weight of 29.56 g, 0.22 g of ethyl orthosilicate and 0.22 g of zinc stearate at a rate of change of 5-60 r / min at 80°C for 10 min to obtain a mixed material;

[0050] Put 20g of the mixed material into a mold of OD33.02mm×ID19.9mm×HT15mm, then put 3g of manganese-zinc ferrite cores with a size of OD30mm×ID25mm×HT3mm into the mold, and finally put the remaining 10g of mixed material into the mold. into the mold, pressurized 18t / cm 2 Hold for 15s, unmold to obtain a green body;

[0051] Preheating at 250°C for 30min in a nitrogen gas flow rate of 5L / min to obtain an amorphous composite magnetic core precursor;

[0052] In the same atmosphere, the amorphous composite magnetic core was obtained by annealing at 390°C for 80min.

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Abstract

The invention provides an amorphous compound magnetic core and a preparation method thereof. The amorphous compound magnetic core provided by the invention is obtained by pressing and thermally treating raw materials containing the following mass content: 80-99% of magnetic amorphous alloy powder, 0.5-8% of insulation coating agent and the rest of ferrite core; the magnetic amorphous alloy powder coated with the insulation coating agent on the surface is coated on the surface of the ferrite core; the current distortion is reduced by use of the excessive current unsaturation ability of the magnetic amorphous powder and by coordinating with the high permeability of the ferrite core, the transient current distortion problem of the low-impedance large-switching current is solved, and the transient loss of the large current is lowered, the effect of instant on-off soft landing of the large current is realized, the electric equipment is protected, and the power factor of a power supply is improved. An experimental result shows that the amorphous compound magnetic core provided by the invention provides the initial permeability, the permeability of the amorphous compound magnetic core achieves 10,000 when the magnetic field intensity is 0.2(Oe), and the permeability is basically initial permeability of the ferrite core.

Description

technical field [0001] The invention relates to the technical field of electronic components, in particular to an amorphous composite magnetic core and a preparation method thereof. Background technique [0002] The 21st century is the era of informatization. The rapid development of informatization has made people more and more dependent on electronic equipment and products, and these electronic equipment and products are inseparable from power supply. Compared with linear power supplies, switching power supplies have advantages in efficiency, volume and weight, especially high-frequency switching power supplies are becoming lighter, smaller, more efficient and more reliable, which makes high-frequency switching power supplies the most widely used. Power supply, its application areas range from household lighting, air conditioners, TVs, computer power supplies, etc. to office printers and copiers. With the increasing shortage of energy at home and abroad, the problem of en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/24H01F27/255H01F1/09H01F1/33H01F41/02
CPCH01F27/24H01F1/09H01F1/33H01F27/255H01F41/0246
Inventor 毛圣华张勉团皮金斌
Owner JIANGXI AITE MAGNETS
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