Amorphous magnetic core vertical winding inductor

Abstract

The invention belongs to the field of inductors, and particularly relates to an amorphous magnetic core vertical winding inductor. The amorphous magnetic core vertical winding inductor comprises an annular amorphous magnetic core and a flat coil, wherein the annular amorphous magnetic core is uniformly and vertically wound with the flat coil; the annular amorphous magnetic core comprises a protection box and an iron-based amorphous magnetic powder core arranged in the protection box; spaces between opposite sides of the iron-based amorphous magnetic powder core and the protection box are filled with organic resin; the annular amorphous magnetic core is constructed by combining at least two magnetic core segments; the magnetic core segments can also be bound together through a metal steel belt; and non-magnetic gaps are formed between adjacent magnetic core segments. Through adoption of the amorphous magnetic core vertical winding inductor provided by the invention, relatively large noise generated by the amorphous magnetic powder core during working under large current can be lowered effectively; meanwhile, the heat-dissipation effect of the inductor and the EMC (Electro Magnetic Compatibility) effect of a circuit can be improved; and automatic winding of the inductor is realized.

Description

technical field [0001] The invention relates to the field of inductors, in particular to an amorphous magnetic core vertical winding inductor. Background technique [0002] Fe-Si-B amorphous magnetic powder core is a preferred magnetic core material for inductors in switching power supplies and inverter power supplies because of its excellent soft magnetic properties such as low high-frequency loss and good anti-DC superposition characteristics, but the current market The amorphous magnetic powder cores used in the world are generally prepared by crushing Fe-Si-B amorphous strips, because the soft magnetic properties of Fe-Si-B amorphous alloys are very sensitive to stress, which leads to the impact of amorphous magnetic powder cores on coatings. Resin requirements are very high. In most cases, the core loss of the coated amorphous magnetic powder core is generally increased by about 20% compared with the uncoated amorphous magnetic powder core, and even higher than 30% in s...

AI Technical Summary

Problems solved by technology

[0002] Fe-Si-B amorphous magnetic powder core is a preferred magnetic core material for inductors in switching power supplies and inverter power supplies because of its excellent soft magnetic properties such as low high-frequency loss and good anti-DC superposition characteristics, but the current market The amorphous magnetic powder cores used in the world are generally prepared by crushing Fe-Si-B amorphous strips, because the soft magnetic properties of Fe-Si-B amorphous alloys are very sensitive to stress, which leads to the impact of amorphous magnetic powder cores on coatings. Resin requirements are very high. In most cases, the core loss of the coated amorphous magnetic powder core is generally increased by about 20% compared with the uncoated amorphous magnetic powder core, and even higher than 30% in some extreme cases. , poor product consistency

In addition, in the process of preparing the inductor, due to the large number of winding turns, it will also generate stress on the coated amorphous magnetic powder core, thereby further increasing the core loss

And because the strength of the Fe-Si-B amorphous magnetic powder core is poor, a large number of defective products will be produced during the chamfering coating process, and the yield rate is low

In addition, the Fe-Si-B amorphous alloy has a large saturation magnetostriction coefficient, which causes the Fe-Si-B amorphous magnetic powder core to generate a lot of noise in some high-current applications, which affects the operation of the entire system. stability

[0003] At the same time, in order to effectively reduce the electromagnetic interference caused by the leakage magnetic field in the closed magnetic circuit of the high-frequency inductance and the eddy current loss caused by the leakage magnetic field of the winding, the existing magnetic powder core winding process generally uses round wires to be evenly and densely wound. Inductance requirements, the number of winding turns is between tens of turns and hundreds of turns. In addition, in order to obtain high inductance under high current, it is necessary to adopt the method of parallel connection of multiple round wires and multi-layer winding, so that it must Manual winding increases the difficulty of winding and high processing costs

And the use of multi-layer winding will inevitably increase the parasitic stray capacitance of the winding, which will bring a large peak to the current waveform and aggravate the electromagnetic interference

The dense stacking of round copper wires makes the total contact area between the conductor and the external air smaller, and surrounds the magnetic core, affecting the cooling effect of the inductor

Moreover, it is difficult to realize automatic winding for products with a high occupation rate of the inner hole of the magnetic ring, which affects the consistency of the product

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