PFC inductor

Abstract

The invention discloses a PFC inductor, which adopts a brand-new square magnetic core design, and is surrounded by side wings around the winding group, which can form better magnetic shielding. Through the combination of a symmetrical base and a winding skeleton, it can It greatly facilitates the assembly in the production process and improves the production efficiency. The circular shaft winding method is adopted to match the circular main core, which not only makes the winding and installation process simpler, but also reduces the cost of the winding skeleton. volume, and the inner side of the wing part of the present invention is provided with an arc-shaped gap to avoid the winding group, which can further reduce the volume of the base without reducing the winding group, so that the volume of the PFC inductor is smaller. The invention can replace all kinds of annular inductance coils, and its application fields are very wide. Because the invention can form better magnetic shielding, it has high energy efficiency, low loss, and can improve the efficiency of the whole machine, and because of its low loss, the heat dissipation effect it is good.

Description

technical field [0001] The invention relates to the technical field of magnetic components, in particular to a PFC inductor. Background technique [0002] In the current power supply, the phase difference between the current and the voltage will form a harmonic current. The existence of the harmonic current makes the total power consumption (apparent power) much higher than the effective power, resulting in the loss of exchange power and wasting a lot of electric energy. In order to suppress harmonics, computer power supplies need to use PFC (power factor corrector) inductors to improve power factor. Power factor refers to the ratio of effective power divided by total power consumption (apparent power). [0003] A traditional PFC inductor mainly includes a magnetic core made of cold-rolled silicon steel sheets, the magnetic core is UU-shaped, and the lead wires are drawn out after the winding is wound around the magnetic core. The winding of this kind of PFC inductor is exp...

AI Technical Summary

Problems solved by technology

The winding of this kind of PFC inductor is exposed on the magnetic core, so it cannot be well electromagnetic shielded, has high magnetic flux leakage and large loss, and the cold-rolled silicon steel sheet itself has low magnetic permeability, large excitation power and high iron loss. Due to the defects in performance, the power factor of this passive PFC inductor is not high (generally below 0.70), the temperature rise is high (the coil temperature exceeds 120°C at full load), and the volume is large, and these are important bottlenecks hindering the development of power supplies.

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