Nanocrystalline materials also have the advantages of silicon steel
, permalloy and ferrite. which is:
1. High permeability: The initial static permeability μ0 can be as high as 120,000 to 140,000, which is equivalent to permalloy. The magnetic permeability of the iron core of the power transformer is more than 10 times that of the ferrite, which greatly reduces the excitation power and improves the efficiency of the transformer. 2. High magnetic induction: the saturation magnetic induction Bsu003d1.2T, which is twice that of permalloy and 2.5 times that of ferrite. The iron core has a high power density, which can reach 15 kW to 20 kW/kg.u200bu200b
3. Low loss: in the frequency range of 20kHz to 50kHz, it is 1/2 to 1/5 of ferrite, which reduces the temperature rise of the iron core. 4. High Curie temperature: the Curie temperature of nanocrystalline materials reaches 570℃, and the Curie temperature of ferrite is only 180℃～200℃.
Due to the above advantages, the transformer made of nanocrystals is used in the inverter power supply, which has played a great role in improving the reliability of the power supply:
1. Small loss, low temperature rise of transformer, long-term actual use by a large number of users has proved that the temperature rise of nanocrystalline transformer is far lower than that of IGBT tube.u200bu200b
2. The iron core has high magnetic permeability, which reduces the excitation power, reduces the copper loss, and improves the efficiency of the transformer. The primary inductance of the transformer is large, which reduces the impact of the current on the IGBT tube during switching.u200bu200b
3. High magnetic induction and high power density, which can reach 15Kw/kg. The volume of the iron core is reduced. Especially the high-power inverter power supply, the volume reduction increases the space in the chassis, which is beneficial to the heat dissipation of the IGBT tube.u200bu200b
4. The overload capacity of the transformer is strong. Since the working magnetic inductance is selected to be about 40% of the saturation magnetic inductance, when the overload occurs, only the SF heat is generated by the magnetic inductance, and the IGBT tube will not be damaged due to the saturation of the iron core.u200bu200b
5. The Curie temperature of nanocrystalline materials is high. If the temperature reaches above 100℃, the ferrite transformer can no longer work, and the nanocrystalline transformer can work normally.u200bu200b
These advantages of nanocrystalline have been recognized and adopted by more and more power supply manufacturers. A number of domestic manufacturers have adopted nanocrystalline iron cores for many years. More and more manufacturers are starting to use it. At present, it has been widely used in inverter welding machine, communication power supply, electroplating and electrolytic power supply, induction heating power supply, charging power supply and other fields, and there will be a greater increase in the next few years.
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