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Method for suppressing electromagnetic interference and making choke device on circuit board

An electromagnetic interference and choke technology, which is applied in the field of electromagnetic interference prevention, can solve the problems that the magnetic core occupies the motherboard area, cannot effectively suppress EMI noise, and the source of electronic system interference is far away, so as to achieve effective EMI and effective prevention and control. , cheap effect

Inactive Publication Date: 2007-08-15
MITAC COMP (SHUN DE) LTD +1
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Problems solved by technology

Therefore, in order to prevent the magnetic core from occupying too much motherboard area, most of the inductors made of magnetic cores can only be placed outside the motherboard of the electronic system and can only be connected to wires (such as power supply Wire)
[0005] In addition, since the inductor formed by the magnetic core is placed outside the motherboard of the electronic system, it is too far away from the main interference source of the electronic system, so EMI noise cannot be effectively suppressed

Method used

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  • Method for suppressing electromagnetic interference and making choke device on circuit board
  • Method for suppressing electromagnetic interference and making choke device on circuit board
  • Method for suppressing electromagnetic interference and making choke device on circuit board

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Embodiment Construction

[0024] Generally, EMI noise can be divided into conduction type (Conduction EMI) and radiation type (Radiation EMI) according to the type.

[0025] Due to the presence of various high-speed switching actions and high-speed pulse signals (such as timing clock) in the electronic system, the voltage and current in the electronic system will be disturbed corresponding to the high-speed switching. Such disturbances will affect and pollute the power supply connected to the electronic system through conduction, and further cause other electronic devices connected to the power supply to be disturbed, which is the so-called conducted EMI.

[0026] Similarly, due to the high-speed switching of the current in the electronic system, it will have the effect equivalent to the antenna, which will radiate interference signals and affect the operation of itself or other electronic devices. This is the so-called radiated EMI.

[0027] Figure 4 is a schematic circuit block diagram of a notebook ...

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Abstract

The invention is a method of replacing magnet core with magnet bead to make choker on a circuit motherboard and simultaneously being able to inhibit electromagnetic interference (EMI) of electronic system, including the main steps: firstly, selecting signal path to form choker on the circuit motherboard; then arranging at least a pair of magnet beads on the top and bottom surfaces of the circuit motherboard, respectively, and surrounding the signal path by them.

Description

technical field [0001] The present invention relates to a kind of prevention of electromagnetic interference (EMI), especially relates to a kind of method that uses magnetic bead component (Bead) to replace magnetic core (Core) to make choke (Choke) on circuit board and apply above-mentioned choke A method of suppressing electromagnetic interference of an electronic system by a current controller. Background technique [0002] Due to the advancement of semiconductor integrated circuit technology, electronic devices are also developing towards higher clock frequencies. However, with the high-speed operation of the circuit, the noise interference and even the misoperation will become more and more serious. In addition, all countries in the world require imported electronic products to comply with their EMC directives (EMC INSTRUCTION), otherwise they cannot be imported and sold. These all show the necessity of reducing the noise of electronic systems. [0003] In order to re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00H04B15/00H01F17/04
Inventor 庄国铭郑裕强
Owner MITAC COMP (SHUN DE) LTD
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