Electromagnetic interference suppression method and device

Abstract

The invention provides an electromagnetic interference suppression method and device. The electromagnetic interference suppression method comprises the steps that signals from an IC terminal are received, and common mode suppression is carried out on the received signals to at least eliminate or weaken interference signals doped in the received signals; the signals after common mode suppression are coupled to at least acquire a signal with enhanced drive capability, and the signal is sent to a network port side. According to the invention, the signals from the IC terminal are received, and common mode suppression is carried out on the received signals to at least eliminate or weaken the interference signals in advance; the signals after common mode suppression are coupled to at least acquire the signal with enhanced drive capability, and the signal is sent to the network port side; the problem that amplified interference signal is difficultly or hardly eliminated in the prior art is solved; electromagnetic interference is eliminated or suppressed; and the problems of excessive electromagnetic interference and the like are effectively solved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of electrical data processing, and in particular, to a method and device for suppressing electromagnetic interference. Background technique [0002] The network transformer (in short, it can be called data mercury) is a device that is available on consumer-grade PCI network cards, and it can also be called a network isolation transformer. Compared with ordinary transformers, network transformers use different magnetic materials due to the different frequencies used. Ordinary transformers are mainly used for energy transmission, while network transformers are usually used for signal transmission. [0003] Specifically, the network transformer has two main functions. One is to transmit data. It uses coil coupling to filter the differential signal sent by the PHY (Physical Layer) to enhance the signal, and couples it to different levels of connections through conversion. The other end of...

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Problems solved by technology

However, in the process of realizing the present invention, the inventor found that the interference signal is generated by the IC terminal and cannot be eliminated through the coupling transformer, and the driving ability of the interference signal becomes stronger after passing through the coupling transformer, which substantially increases the interference. After the common mode filter, it is difficult or impossible to eliminate the interference, which leads to the phenomenon that the electromagnetic interference (EMI) often exceeds the standard.

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