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Choke coil and its embedded iron core

A choke coil, iron core technology, applied in the direction of magnetic core/yoke, inductor with magnetic core, transformer/inductor magnetic core, etc., can solve the problem of large area of ​​choke coil, disadvantage of miniaturization, and increase of material cost And other issues

Inactive Publication Date: 2009-02-04
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Utilize the characteristics of high magnetic permeability of the iron core 111 to filter out the common mode noise, and utilize the characteristics of the low magnetic permeability of the iron core 114 to filter out part of the differential mode noise, however, this way of arranging two independent iron cores will The area occupied by the entire choke coil is quite large, which is not conducive to miniaturization
And because an insulating material must be coated between the two independent iron cores to separate them, it not only increases the material cost, but also consumes labor time

Method used

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  • Choke coil and its embedded iron core
  • Choke coil and its embedded iron core
  • Choke coil and its embedded iron core

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Embodiment Construction

[0021] Please refer to Figure 2A , which is a schematic diagram of a choke coil according to a preferred embodiment of the present invention. The choke coil 20 disclosed in the preferred embodiment of the present invention includes an iron core 22 and two sets of winding wires 28. For clarity, an imaginary line L is used as the criterion. The right half of the figure only shows the inside of the iron core 22. And the left half of this figure is still a schematic diagram of the choke coil 20 .

[0022] Please also refer to Figure 2A , Figure 2B ,and Figure 2C , Figure 2B yes Figure 2A A schematic diagram of the interior of the core, while Figure 2C yes Figure 2B Sectional view of the middle iron core along the direction A-A'. The iron core 22 includes a first iron core 22a and a second iron core 22b. The second iron core 22b is embedded in the first iron core 22a, and the two sets of windings 28 are respectively wound around the outside of the first iron core 2...

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Abstract

The choke coil comprises a first iron core of composite magnetic material, a second iron core comprised of ferrite, and two winding wires circled outside of the first core; wherein, burying the second iron core into the first one with different initial magnetic conductivity value (mu), filling a gap on the second core by material same as the first core. This invention can eliminate the common / differential mode noise with less volume and cost.

Description

technical field [0001] The present invention relates to a choke coil, in particular to a choke coil capable of filtering both common-mode noise and differential-mode noise. Background technique [0002] Nowadays, people use electrical appliances very frequently, and the use of electrical appliances will inevitably use power to make the electrical appliances operate normally. However, when electrical appliances use AC power, the operation of power supply, high-frequency transformer or other component parasitic capacitance or stray capacitance may cause noise current to be included in the current supplied by the AC power supply. This is the phenomenon of electromagnetic interference. [0003] Generally speaking, the noise generated by the use of AC power includes differential mode noise (differential modenoise) and common mode noise (common mode noise), and the electromagnetic interference (EMI) filter circuit can be used as the first line of defense against electromagnetic r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F27/24H01F3/10H01F17/06H01F37/00
CPCH01F2017/048H01F3/10H01F1/26H01F17/062H01F2003/106
Inventor 李政鸿眭明山黄逸鸿
Owner DELTA ELECTRONICS INC