Electronic device, filtering module and method for reducing common mode noise

Abstract

The invention discloses an electronic device, a filtering module and a method for reducing common mode noise, wherein the filtering module comprises a circuit board, a connector, a filtering ring and a plurality of coils, the connector and the filtering ring are both arranged on the circuit board; and the plurality of coils are wound on the filtering ring and electrically connected with the connector.

Description

technical field [0001] The present invention relates to a filter module, in particular to a filter module for filtering common mode noise. Background technique [0002] Electromagnetic interference (Electromagnetic Interference, EMI) is a physical phenomenon that is pervasive in daily life. Generally speaking, noises that cause electromagnetic interference can be classified into differential mode noise and common mode noise. At present, all electronic devices that need to use flexible cables (Flat Printed Cable, FPC; Flat Flexible Cable, FFC) to connect electronic components have the problem of common mode noise. If the common mode noise is too large, it will make the electronic device fail the EMI test. [0003] see figure 1 , figure 1 It is a schematic diagram of using a filter loop (core) 10 to filter common mode noise for the background art. like figure 1 As shown, a general electronic device (not shown in the figure) has a mainboard 12, and a connector 14 and a ch...

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Problems solved by technology

[0004] However, when installing the filter ring 10 on the flexible flat cable 18, a space needs to be reserved during assembly, and the assembly procedure is relatively complicated.

If the flexible flat wire 18 required by the electronic device is larger, the filter ring 10 is also larger, not only the internal volume of the electronic device needs to be increased, but the flexible flat wire 18 is easy to be lost due to the heavy weight of the filter ring 10. Connector 14 comes off

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