Annular inductor and winding method thereof

Abstract

The invention discloses an annular inductor and a winding method thereof. The annular inductor comprises: an annular magnetic core provided with a first winding area and a second winding area which are symmetrically distributed; and a winding wire comprising a first section wound on the first winding area and a second section wound on the second winding area. At least two layers of winding wires are wound in the first winding area and the second winding area respectively; and a first set gap is reserved between different layers of windings on the first winding area and the second winding area, the wiring directions of every two adjacent layers of windings are opposite, and a second set gap is reserved between coils of the windings on the same layer. The distributed capacitance between the layers can be effectively reduced based on the first set gap, the distributed capacitance between the adjacent coils on the same layer can be effectively reduced based on the second set gap, the winding wire is bent into the first section and the second section to be wound respectively, and the overall parasitic capacitance of the winding wire can be effectively reduced. The EMI noise of the annular inductor is effectively suppressed, and a shielding cover outside the annular inductor can be omitted.

Description

technical field [0001] The present application relates to the field of inductors, in particular to a ring-shaped inductor and a winding method thereof. Background technique [0002] An inductor (Inductor) is a component that can convert electrical energy into magnetic energy and store it. It is generally composed of a skeleton, windings, shields, packaging materials, and magnetic cores. Winding refers to a group of coils with specified functions, which is the basic component of inductors. The winding can be divided into single-layer and multi-layer, and the single-layer winding has two forms: dense winding (the wires are next to each other when winding) and inter-winding (there is a certain distance between each wire when winding); There are many kinds of multilayer windings, such as layered flat winding, random winding, and honeycomb winding. The winding method has a great influence on the impedance of the inductor, the reduction of distributed capacitance and the reducti...

AI Technical Summary

Problems solved by technology

[0003] In the related technology, there are two main methods of inductance winding. The first one is to wind the wire from the beginning to the end, and the winding is flat and dense. The second is to wind the wire back and forth tightly. The anti-electromagnetic interference performance of the inductance is poor, and a wire is wound from the beginning to the end, and the work efficiency is low

In addition, the PFC (Power Factor Correction, power factor correction) inductor passes a high-frequency large current in the circuit, the greater the di / dt, the easier it is to generate EMI (Electromagnetic Interference, electromagnetic interference) noise, and the IGBT (Insulated Gate BipolarTransistor, insulated gate bipolar transistor) high-voltage side, there is a high-frequency high voltage, the larger the dv / dt, the easier it is to generate EMI problems

These interferences radiate through the space of the PFC inductor and cannot be filtered out by the EMI filter. If the shield is added, it will cause the problem of temperature rise of the PFC inductor

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