Module for separating different-mode signal and common-mode signal

Abstract

The invention relates to a module for separating a different-mode signal and a common-mode signal. The module comprises a first transmission-line transformer. The two ends of a first transmission-line transformer primary coil are connected with the firing line output terminal and the null line output terminal of a line impedance stabilizing network respectively, the first transmission-line transformer primary coil is connected between the firing line output terminal and the null line output terminal, a center tap is arranged in the middle of the primary coil, the center tap is grounded through a first resistor, the center cap is connected with a common-mode signal output terminal, the firing line output terminal is further connected with one end of the input end of a second transmission-line transformer, the corresponding output end of the second transmission-line transformer is connected with a different-mode signal output terminal through a second resistor, the null line output terminal is further connected with the other end of the input end of the second transmission-line transformer, and the corresponding output end the second transmission-line transformer is grounded. The module has the advantages of being simple in circuit structure, good in common-mode rejection ratio and different-mode rejection ratio, precise in test effect, small in size, light in weight and the like.

Description

technical field [0001] The invention relates to the technical field of electromagnetic compatibility detection, in particular to a module for separating differential mode signals and common mode signals. Background technique [0002] In the existing technology, according to the propagation path of the conducted interference emitted by the equipment under test, it can be decomposed into two components of common mode and differential mode, such as figure 1 As shown: LISN is the line impedance stabilization network 12 (also known as artificial power supply network), which is a necessary equipment for testing conducted emissions. It provides a test environment of approximately 50Ω for test equipment (spectrum analyzer, receiver) Isolate the useless radio frequency signal from the power grid and avoid the power grid directly burning the test instrument, (GB6113-85), the right side is used to connect with the electromagnetic interference source 15 to be tested. [0003] According...

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Therefore, the authenticity of the performance data disclosed by Emcis remains to be examined

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