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Advantages and difficulties of nanocrystalline used in inverter power supply

Advantages and difficulties of nanocrystalline used in inverter power supply


1、 Advantages of nanocrystals

Nanocrystalline Cores (super microcrystalline core) also has the advantages of silicon steel, permalloy and ferrite core. Namely:

High magnetic induction: saturation magnetic induction BS =, twice that of permalloy and times that of ferrite core. The power of transformer core is large and can exceed 15 kW ~ 20kW / kg.

High permeability: original permeability of static data μ 0 can reach 120000 ~ 140000, which is very similar to permalloy. The permeability of the coil of the transformer used to output power is more than 10 times that of the ferrite core, which greatly reduces the output power of the excitation current and improves the high efficiency of the transformer.

Low loss: in the frequency range of 20kHz ~ 50KHz, it is 1 / 2 ~ 1 / 5 of ferrite core to reduce the temperature of transformer core.

High Curie temperature: the Curie temperature of nanocrystalline magnetic ring (ultramicrocrystalline core) is 570 ℃, and the Curie temperature of ferrite core is only 180 ℃ ~ 200 ℃.

Because of the advantages of left and right, the transformer produced by nanocrystalline is used in inverter power supply, which has a great effect on improving the credibility of switching power supply:

Low loss and low transformer temperature. The long-term specific application of many customers has confirmed that the temperature of nanocrystalline transformer is far lower than that of IGBT water pipe.

Nanocrystalline toroidal core for inverter

The transformer core has high permeability, reduces the output power of excitation current, reduces copper loss and improves the high efficiency of the transformer. The primary and intermediate inductors of the transformer are large, which reduces the impact of the current on the IGBT water pipe when the power supply is switched on and off.

In operation, the magnetic induction is high and the power is large, which can exceed 15kw / kg. The volume of transformer core is reduced. It is a high-power inverter power supply. The reduction of volume promotes the expansion of indoor space in the main box, which is beneficial to the heat pipe heat dissipation of IGBT water pipe.

The load working capacity of the transformer is strong, because the magnetic induction is selected around 40% of the magnetic induction in the saturated state. When the load is generated, it is not easy to destroy the IGBT water pipe due to the saturation state of the transformer core only because the magnetic induction is increased.

The Curie temperature of nanocrystalline magnetic ring (ultramicrocrystalline iron core) is high. Assuming that the temperature exceeds about 100 ℃, the ferrite core transformer can no longer work, and the nanocrystalline transformer can completely work normally.

Nanocrystalline core

This advantage of nanocrystalline is understood and selected by more and more switching power supply manufacturers. A number of manufacturers in China have already selected nanocrystalline transformer iron core and used it for many years. More and more manufacturers have just begun to apply or use. At this stage, it has been widely used in inverter welding machine, power supply system, electroplating process, electrolytic power supply, induction heating equipment, charging power supply and other industries, and will be greatly improved in the next two years.

Because of its excellent characteristics, amorphous and nanocrystalline soft magnetic materials fill the shortage of raw materials of silicon steel and ferrite magnetic core in different applications, promote various electronic equipment to a new level, improve high efficiency, and obtain significant practical effects of environmental protection and energy saving. New materials show vigorous vitality.

Nowadays, more and more people know about amorphous magnetic core and nanocrystalline magnetic ring (ultramicrocrystalline iron core). In addition to switching on the transformer, amorphous magnetic core and nanocrystalline magnetic ring (ultramicrocrystalline iron core) can be used as raw materials for transformer iron core of voltage transformer, series reactor, controller, filter and other components. The application scope also involves electrical products, smart meters DC frequency conversion air conditioner, leakage protection circuit breaker, accurate measurement of power transformation engineering of power supply system, power distribution equipment, telemetry and sensing technology, central air conditioning of electric locomotive of railway line system software, inverter power supply of electric locomotive, railway signal sensing technology, etc. are also used in a variety of military and national new science and technology projects such as aviation, airlines and ships.

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