A Method for Reducing the Average Value of Network Port Conducted Interference
A technology of conducted interference and average value, applied in the field of server electromagnetic compatibility testing, can solve the problems of unintended signal electromagnetic interference, reduce the average value of network port conducted interference, etc., to achieve the effect of ensuring integrity
Active Publication Date: 2017-10-13
LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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Problems solved by technology
[0008] In order to avoid the problem of electromagnetic interference caused by the above-mentioned unintended signals, the present invention proposes a method for reducing the average value of the conducted interference of the network port
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[0021] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0022] as attached image 3 The schematic diagram of the interference principle of the high-speed signal reference ground division method in the IO area of the present invention is shown in the diagram, in which the direction of the noise conduction route is marked with a dotted line. In this method to reduce the average value of the conducted interference of the network port, the external cable and the working signal line are isolated by a 1:1 transformer, so as to avoid the noise of the working signal line at the input end and the external cable at the output end from being transmitted to the other party through the signal line; the external line The cable and the working signal line are respectively connected to capacitor B and capacitor C. Capacitor C is connected to the reference ground plane through the pin pin of the input terminal, capacitor B is connected ...
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The invention particularly relates to a method for reducing the average value of network port conduction interference. The method of reducing the average value of the conducted interference of the network port is to adopt the pin pin of the output end to be suspended in the air in the principle of the network port; the connection between the connector shell and the chassis shell is strengthened in the mechanism; in the layout design, the output signal reference ground hole anti ‑pad size. This method of reducing the average value of the conducted interference of the network port breaks the traditional practice of dividing the high-speed signal reference ground in the IO area. Using the structure of the connector, in the case of high-speed signals, the cut signal reference ground is still used to prevent "unintended The method of spreading the "signal" interference source to the IO area reduces the average value of the network port conduction interference test; cleverly uses the layout to isolate the signal reference ground plane, while cutting off the interference signal diffusion, it ensures the integrity of the normal signal reference ground Sex; ensure that after cutting, the output signal reference ground plane has enough ground plane to discharge external interference.
Description
technical field [0001] The invention relates to the technical field of server electromagnetic compatibility testing, in particular to a method for reducing the average value of network port conduction interference in the conduction test. Background technique [0002] Electromagnetic Interference (EMI) is a serious and growing form of environmental pollution. Its effects range from an annoying crackle of broadcast reception to the breakdown of safety-critical control systems, which can lead to fatal accidents, major economic losses and major national security incidents. Conducted interference is an important part of electromagnetic interference, which is used to measure the interference transmitted by electronic products and systems from power ports and signal ports to the power grid or signal network. Currently, for the server, the signal port mainly refers to the network port. [0003] The source of electromagnetic interference can be divided into two types: "intentional ...
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IPC IPC(8): G01R31/00
Inventor 党杰
Owner LANGCHAO ELECTRONIC INFORMATION IND CO LTD