With the continuous miniaturization of transformers, the continuous use of soft magnetic materials has led to the continuous change of this trend. Nowadays, the volume and weight of electronic products have been greatly reduced, which has promoted the development of electronic components, including electronic transformers, in the direction of light, thin and small. The production process of electronic transformer is facing a huge change. It is an inevitable trend for electronic transformer to develop in the direction of high frequency, low loss, light weight and small volume. The soft magnetic core, as the core component of electronic transformer, will be the first to bear the brunt of this change, so it will be widely used with high saturation magnetic induction The use of amorphous nanocrystalline soft magnetic alloy with high initial permeability and low high-frequency loss as the core of electronic transformer will greatly promote the miniaturization of electronic transformer and meet the development needs of the electronic industry.
1. At present, with the development of nano science and technology and rapid quenching technology, various new nano materials, such as nanocrystalline powder materials, nano-film materials and nano-particle film materials, are constantly developed. Once industrialized, these new nano materials will greatly promote the development of electronic transformers towards high-frequency, miniaturization and chip.
2. Application of amorphous nanocrystalline alloy materials in electronic transformers
Generally speaking, electronic transformers have the following requirements for their core materials:
(1) High saturation magnetic induction;
(2) Low high-frequency loss as possible;
(3) High initial permeability;
(4) High Curie temperature and good temperature stability;
(5) Good environmental stability and insensitive to stress;
(6) Some applications such as pulse transformer also require high rectangular ratio Br/Bs or low Br. Amorphous nanocrystalline soft magnetic alloy materials can meet the above performance requirements in the range of 50~1000kHz (usually less than several hundred kHz) due to its band thickness and resistivity, which makes the development and application of amorphous nanocrystalline alloys very active in this frequency band. Various kinds of magnetic devices have been developed and widely used in power industry, electronic industry and power electronics, as current transformers, switching power supply | voltage regulators Transformer, reactor, filter and anti-EMI device of inverter power supply and SPC exchange power supply.
At present, there are promotion and application markets in the following aspects:
(1) To replace ultra-thin silicon steel products, we know from the market demand of ultra-thin silicon steel products of Shanghai Steel Research Institute that ultra-thin silicon steel (thickness<0.1mm) was widely used in various electronic components above 400Hz in the 1970s, such as high-frequency transformers, reactors, magnetic shielding, etc. At present, the market demand is large, but the supplier is difficult to meet the market demand. Using amorphous nanocrystalline alloy materials to replace it can not only improve product performance, quality and promote miniaturization, And the price is also profitable.
(2) Due to the limitations of domestic ferrite production equipment and technical conditions, high permeability, high performance and high power ferrite can hardly meet the domestic market demand for high permeability and high power magnetic core devices. If amorphous nanocrystalline materials are used to replace them, it can promote the localization and miniaturization of some electronic equipment.
(3) For electronic products with high working temperature and harsh environment, various magnetic devices for electronic products used in special environments such as oil field drilling and ocean exploration are made of amorphous nanocrystalline alloy materials, which can make the best use of everything and avoid the trouble of material selection.
(4) All kinds of magnetic devices used in military products, such as aerospace, require small and light, good temperature stability, and high magnetic properties. The use of amorphous nanocrystalline alloy materials is far superior to other soft magnetic materials.
(5) The miniaturization of high-frequency, high-current, high-power power transformer, reactor, filter and other devices. At present, most of these devices are made of ferrite or cold-rolled silicon steel, with a working frequency of f=20kHz and a working magnetic induction of B=0.2-0.3T. If the amorphous nanocrystalline alloy core is used, the working frequency will be raised to f=40-50kHz and a working magnetic induction of B=0.5-0.6T, which can greatly reduce the volume and size of the core device.
(6) With the development of the current electric power industry, the magnetic core of high-precision precision instrument transformers, precision current transformers, precision voltage transformers and galvanometers for high-precision measurement need to use high-performance magnetic cores. The traditional silicon steel materials can no longer meet its performance requirements, and can only choose iron-based nanocrystalline alloy and permalloy materials. The cost-effectiveness ratio of the two is self-evident.