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Circuit board shielding method and electronic equipment using the method

A technology of electronic equipment and circuit boards, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of high cost and poor workmanship, and achieve the effects of low cost, electromagnetic radiation suppression, and convenient maintenance work

Active Publication Date: 2011-12-14
HISENSE VISUAL TECH CO LTD
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  • Summary
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of high cost and poor manufacturability caused by welding metal shell shields on circuit boards to suppress electromagnetic radiation of circuit boards in existing electronic equipment, the present invention provides a brand new circuit board shielding method, by using shielded wire or metal sheet instead of the existing metal shell shield, the electromagnetic radiation generated by the circuit board has a good local shielding effect

Method used

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  • Circuit board shielding method and electronic equipment using the method
  • Circuit board shielding method and electronic equipment using the method
  • Circuit board shielding method and electronic equipment using the method

Examples

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Embodiment 1

[0021] Embodiment 1. In this embodiment, a TV core board is taken as an example to describe the circuit board shielding method proposed by the present invention in detail.

[0022] figure 1 It is a structural schematic diagram of a TV core board circuit, including various functional chips and module circuits 1 to 10, wherein, when the TV main chip CPU and the double data rate memory DDR are in data communication, due to the communication between the DDR and the CPU The clock frequency of the circuit board is relatively high, generally at 180MHz, so the electromagnetic radiation generated is relatively strong, which will cause serious electromagnetic interference to the entire circuit board. figure 2 It is the corresponding spectrum diagram measured by the complete machine of the TV core board in the 3M method darkroom. In the spectrogram, the point of the cross symbol is the quasi-peak value. In the EMC test of electronic equipment, it is required that it cannot exceed the s...

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Abstract

The invention discloses a circuit board shielding method and electronic equipment using the method. Two well-connected grounds are discharged near the electronic circuit that needs to be shielded on the internal circuit board, and a shielding wire or a metal sheet is connected to the grounds. The shielding wire or the metal sheet is positioned just above the electronic circuit, so that the shielding wire or the metal sheet is used to replace the existing metal shell shield, and the purpose of effectively suppressing the electromagnetic radiation of the circuit board is also achieved in a simple structural form , not only has the obvious advantages of good manufacturability and low cost, but also designs the plug-in structure at both ends of the shielded wire or metal sheet, and then uses the plug-in method to connect and fix the circuit board, which greatly facilitates the future maintenance of electronic equipment Work.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic radiation suppression methods, and in particular relates to a method for shielding electromagnetic radiation on a circuit board and electronic equipment using the method. Background technique [0002] Electromagnetic waves radiated and leaked by electronic equipment not only seriously interfere with the normal operation of other electronic equipment, but also cause equipment dysfunction, transmission errors, and threaten human health and safety, which is very harmful. Therefore, how to reduce the electromagnetic interference (EMI) of electronic equipment has become one of the main issues that manufacturers of electronic equipment must consider. [0003] For the current electronic equipment, most of the electromagnetic radiation is generated by the circuit board inside the electronic equipment. Therefore, in order to make the electronic product meet the EMC (electromagnetic compatibility) t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
Inventor 高金年王松丽黄勇
Owner HISENSE VISUAL TECH CO LTD
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