Advantages and problems of nanocrystalline magnetic ring

Advantages and problems of nanocrystalline magnetic ring (ultramicrite core, amorphous core) applied in inverter power supply

The working frequency of high frequency inverter power supply in 20 kHz ~ 50 kHz, as the heart's main power supply transformer, the traditional ferrite core material, though a very low loss at high frequency, but the magnetic properties of low frequency (below 100 kHz) is not very good, and because of its low saturation induction value (Bs), the volume and weight of the iron core is still large, in addition, ferrite of low Curie temperature, thermal stability, temperature is a little higher results in the decrease of Bs value, easy to saturation, working condition is not stable, not suitable for high frequency power.Nanocrystalline magnetic ring (nanocrystalline iron core) has excellent comprehensive magnetic properties, especially for high frequency and high power inverter power supply.

Nanocrystalline magnetic ring (nanocrystalline iron core) has the advantages of silicon steel, permalloy and ferrite at the same time.That is:

High magnetic sensitivity: saturated magnetic sensitivity Bs = 1.2t, which is twice that of permalloy and 2.5 times that of ferrite.The power density of iron core is large, which can reach 15 kW ~ 20kW/kg.

High permeability: static initial permeability 0 can be up to 120,000 ~ 140,000, equivalent to permalloy.The magnetic permeability of power transformer core is more than 10 times that of ferrite, which greatly reduces the excitation power and improves the transformer efficiency.

Low loss: in the frequency range of 20kHz ~ 50kHz, the ferrite is 1/2 ~ 1/5, reducing the core temperature rise.

High Curie temperature: nanocrystalline copper (superfine crystal core) of Curie temperature of 570 ℃, ferrite the Curie temperature of 180 ℃ ~ 200 ℃.

Due to the above advantages, the nanocrystalline transformer is applied in the inverter power supply, which plays a great role in improving the reliability of power supply:

Small loss, low temperature rise of the transformer, the long-term practical use of a large number of users proved that the temperature rise of the nanocrystalline transformer is much lower than the IGBT pipe temperature rise.

The magnetic permeability of iron core is high, the excitation power is reduced, the copper loss is reduced, and the transformer efficiency is improved.The primary inductance of the transformer is large, which reduces the impact of current on the IGBT tube when switching.

High working magnetic inductance, high power density, up to 15Kw/kg.Reduced core volume.Especially for high power inverter, the reduction of volume makes the space in the case larger, which is conducive to the heat dissipation of IGBT pipe.

The transformer has a strong overload capacity. Because the working magnetic sensitivity is about 40% of the saturation magnetic sensitivity, when the overload occurs, it only generates heat due to the increase of magnetic sensitivity, and will not damage the IGBT pipe due to the saturation of the iron core.

Nanocrystalline copper (superfine crystal core) high Curie temperature, assuming that the temperature is above 100 ℃, the ferrite transformer has been unable to work, nanocrystalline transformer can work normally.

Nanocrystalline these advantages, are more and more power supply manufacturers know and use, a number of domestic manufacturers, has used nanocrystalline iron core, and applied for many years.More and more manufacturers began to use or try.At present, it has been widely used in inverter welding machine, communication power supply, electroplating power supply, induction heating power supply, charging power supply and other fields.

Almost all the nanocrystalline transformers used are made by the whole machine manufacturer itself. Due to the different design of inverter circuit, the different understanding of nanocrystalline magnetic ring (ultrafine crystal core) and the different mastering degree of transformer manufacturing technology, the level of transformer manufactured is also different.Manufacturing high frequency transformer becomes the important link in the production.Accordingly, a few manufacturer put forward, whether specialization produces high-frequency transformer, the requirement that complete machine manufacturer buys transformer directly.

In the original transformer with frequency range from 20kHz to 50kHz, ferrite is generally used as transformer core. The core is mostly of type U or type EI, while a few of them use type O core. It is difficult to reduce the leakage inductance of the transformer structurally with type U or type EI core.

Due to the advantages of nanocrystalline magnetic ring (nanocrystalline iron core), it provides ideal material for miniaturization and high efficiency of high frequency transformer.New materials have promoted the birth of a new structure of high-frequency transformers.

This patented, named "the beatles" transformer after others improved after referred to as the "H" type transformer, also patented, make full use of these two kinds of transformer nanocrystalline copper (superfine crystal core) of high permeability, high magnetic induction intensity, low loss, and circular iron core of the magnetic properties of magnetic flux leakage is small, the characteristics of innovation in terms of the primary and secondary structure of the transformer.The metal protection box of the iron core is used as the secondary coil of the transformer, which is suitable for large current output. The primary coil is evenly wound on the secondary with little leakage inductance.Transformer fixed support and confluence output combined as one, conducive to heat dissipation.

The advantages of this transformer are:

1.Large power: 10 kW ~ 20kW, power density can reach 15 kW ~ 20kW/kg

2.Leakage sense small, general level less than 5 H, the best less than 2 H

3.High efficiency, over 99%

4.It is small in size and light in weight. The weight of the 15kw transformer is 3kg and the volume is 160x150x95mm

5.Beautiful appearance.

Due to the structure and processing of this kind of transformer, the price is relatively high. At present, it is only used in electroplating and electrolytic power supply for a certain number of applications.For the price competition industry promotion is also difficult.To this end, and launched a "Ω" type transformer.

"Ω" type transformer its structure is the same as the ordinary ring transformer, but the coiling method is improved, which reduces the leakage inductance and distributed capacitance.Leakage inductance can generally be less than 10 H.The transformer is about 40 per cent cheaper than a beetle or an h-type transformer.Excellent price performance attracted many manufacturers.

The productization of nanocrystalline transformer reasonably USES the performance of nanocrystalline soft magnetic material;It is conducive to the productization and standardization of high-frequency power transformer.Is advantageous to the transformer efficiency, the level enhancement;Good for inverter welding, electroplating, electrolysis and other equipment

Improve production efficiency.Several manufacturers are now able to produce this kind of transformer.

There are already some machine production began to adopt "Ω" type transformer, realizing integrated production, this is a "more, faster, better, the province".

Amorphous and nanocrystalline soft magnetic materials make up for the deficiency of silicon steel and ferrite materials in different applications due to their excellent characteristics, and improve various electronic products to a new level, improve the efficiency and achieve obvious energy saving effect.The new material shows a vigorous vitality.

Now, more and more people realize the magnetic core of amorphous and nanocrystalline copper (superfine crystal core), in addition to the transformer, magnetic core of amorphous and nanocrystalline copper (superfine crystal core) can also be as transformer, reactor, sensor, filter device, such as core materials, application scope also involves in our daily life appliances, smart meters, dc frequency conversion air conditioning, electric leakage protection switch, etc., transmission measurement of power system, power distribution, remote sensing, etc., railway locomotive air conditioning, electric locomotive of the inverter power supply, railway signal sensor, etc.,It is also used in many military industry and national high-tech projects such as aerospace, aviation and navigation, etc.

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