Low-noise transformer core for inverter power supply

Abstract

The invention discloses a transformer core for an inverter power supply, raw material components comprising C, Si, B, (Nb, Sb, V, Mo, Ta, Cr and W), Cu and the balance Fe are put into a vacuum furnace based on a ratio to be refined, the temperature of liquid steel is 1500DEG C, argon is introduced, sprayed and cast on a high rotating speed copper roller, and water is cooled by differential movement, thus obtaining a low magnetostriction amorphous alloy strip with the length of 20-26 micrometers, the strip is wound into a transformer core and heat treatment is carried out at 530DEG C, the temperature is kept for 2-4 hours, thus crystallizing the alloy and obtaining a nano-crystalline core of a low magnetostriction coefficient lambda s; a direct current magnetic field is applied at the same time of keeping and reducing the temperature during the heat treatment; the position of the nano-crystalline core is changed radically, a compressive stress is applied, the stress is eliminated, and the nano-crystalline core recovers until no adhesion exists between lamellas of the whole core; and two side ends of the nano-crystalline core are respectively coated with an unstressed glue layer, and then the surface of the whole nano-crystalline core is coated with an epoxy resin insulating layer for reducing noise. The transformer core which is ideal at present has good noise reduction effect.

Description

technical field [0001] The invention relates to a low-noise transformer iron core for an inverter power supply, which is mainly used for power iron cores of soft magnetic materials, transformers, inverter power supplies, switching power supplies, pulse power supplies, energy conversion and utilization, and effectively reduces the noise generated by the iron cores. Background technique [0002] At present, the power core of inverter power supply mainly uses ferrite and nanocrystalline iron core. In recent years, with the continuous increase of power, nanocrystalline iron cores have increasingly shown more important advantages and competitiveness. Chinese patents ZL96106793.4 and ZL96244535.5 provide a soft magnetic core for an inverter power supply and a manufacturing method thereof, which are currently the main technologies used. The method is: the amorphous or nanocrystalline soft magnetic thin strip is wound into a laminated form; the end face protection film is coated on...

AI Technical Summary

Problems solved by technology

As a result, the currently used inverter power supply core and switching power supply core often have a lot of noise, and the working magnetic inductance Bm has to be reduced. Even if the Bm is reduced, the noise cannot be avoided, and other components such as coils and circuits The noise generated in the machine is often forced to stop using it because of the unbearable noise

Because the alloy composition used in the iron core of the inverter power supply in the prior art is Fe73.5Cu1Nb3Si13.5B9, the magnetostriction λs=2.1×10-6 of the composition alloy, because the magnetostriction coefficient of the material is not zero, the iron core is It is made of stacked thin sheet magnetic materials, so under the action of high-frequency alternating magnetic field, there will be a certain frequency of dimensional changes, resulting in vibration and large noise

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