Amorphous compound magnetic core and preparation method thereof

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...

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