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Choke and electro magnetic interference (EMI) filter circuit

A technology of choke coils and coils, which is applied in the direction of circuits, inductors, electrical components, etc., can solve the problems of adverse effects of the internal layout of the frequency converter, large inductance and capacitance, increased loss and volume, etc., to improve THD, Effects of size reduction and suppression of EMI conduction noise

Active Publication Date: 2014-02-12
ZHEJIANG HOLIP ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a single-stage EMI filter is used, larger inductance and capacitance values ​​are required in many cases, which increases loss and volume
However, when a two-stage EMI filter is used, it will have an adverse effect on the internal layout of the inverter

Method used

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  • Choke and electro magnetic interference (EMI) filter circuit
  • Choke and electro magnetic interference (EMI) filter circuit
  • Choke and electro magnetic interference (EMI) filter circuit

Examples

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Embodiment Construction

[0018] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. It should be understood, however, that these descriptions are exemplary only, and are not intended to limit the scope of the present disclosure. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present disclosure.

[0019] Various structural schematic diagrams according to embodiments of the present disclosure are shown in the accompanying drawings. The figures are not drawn to scale, with certain details exaggerated and possibly omitted for clarity of presentation.

[0020] According to the present disclosure, the choke coil may include multiple coils implemented (or "integrated") on the same magnetic core, so that the size of the choke coil may be reduced. At least one of the plurality of coils can be realized as a nonlinear inductance, so that the inductance valu...

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PUM

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Abstract

The invention discloses a choke and an electro magnetic interference (EMI) filter circuit. According to an example, the choke can comprise a magnetic core and n coils. The magnetic core comprises a first portion and a second portion which are separated from each other, the first portion of the magnetic core comprises m magnetic core branches, and m is an integer and larger than or equal to 2. Each coil is wound on a corresponding magnetic core branch, n is an integer, and m>=n>=2. At least one coil achieves non-linear inductance. For example, the non-linear inductance can be achieved by width change of an air gap between the end faces of the magnetic core branches and the second portion or by filling a magnetic filling material with magnetic conductivity higher than that of the magnetic core in the place between the first portion and the second portion of the magnetic core.

Description

technical field [0001] The present disclosure relates to harmonic distortion and electromagnetic interference (EMI) noise suppression, and more particularly, to a choke coil and an EMI filter circuit including the choke coil. Background technique [0002] In many applications, such as alternating current (AC) frequency converter or motor drive applications, total harmonic distortion (THD) is required to meet the corresponding international (internal) standards. Using an AC or DC choke is an easy and cheap solution. The AC choke can be directly inserted on the AC input side, and the DC choke can be inserted in the DC bus. However, AC choke solutions are generally bulky compared to DC choke solutions. This is because, for multi-phase multi-wire AC input, multiple choke coils are required. For example, for 3-phase 3-wire AC input, 3 choke coils are required, for 3-phase 4-wire AC input, 4 choke coils are required, and so on. [0003] In addition to the inductance value of t...

Claims

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Application Information

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IPC IPC(8): H01F17/04H01F38/02H01F27/30H03H9/46
Inventor 冯阳詹斯·乌尔里克·贾格王鹏黄平
Owner ZHEJIANG HOLIP ELECTRONICS TECH