Method for diagnosing radiation noise type by using GTEM chamber

Abstract

The invention relates to a method for diagnosing radiation noise type by using GTEM chamber. The method is implemented by firstly dividing the plane area of the equipment to be tested into a plurality of radiation interference unit areas (nij); secondly moving the electric field probe and the magnetic field probe in the level plane area respectively, measuring the radiation interference unit areas respectively to obtain radiation electric field intensity and radiation magnetic field intensity of each radiation interference unit area; thirdly deducting the radiation electric field intensity and radiation magnetic field intensity of each radiation interference unit area to obtain corresponding near field wave impedance; and finally judging whether the radiation is common mode radiation or differential mode radiation according to the change of the near field wave impedance of each radiation interference unit area. The method can diagnose the type of radiation noise, thus providing design basis for noise suppression measures.

Description

technical field [0001] The invention relates to a method for testing radiation noise, in particular to a method for diagnosing the type of radiation noise using a GTEM cell, and belongs to the technical field of electromagnetic compatibility. Background technique [0002] Modern power electronic products are facing miniaturization and intelligence, and the design of the system is becoming more and more complex. In addition, the parasitic parameters of the system generated by the high-speed switching of the switching elements in the power electronic equipment cause the equipment to suffer from radiated interference more and more seriously, and The requirements for the system's ability to resist electromagnetic interference are getting higher and higher. Therefore, in order to save development time, save development costs, and prepare for the product to pass the inspection of the quality inspection department, it is essential to conduct radiated EMI testing on the product. ...

AI Technical Summary

Problems solved by technology

However, these methods have very high requirements for the environment, and the construction price is also very expensive, which is unaffordable for small and medium-sized enterprises. From an economic point of view, it is necessary to design a cheap and practical multifunctional GTEM cell.

[0004] Radiated noise includes common-mode noise and differential-mode noise. Existing methods for testing radiated noise using GTEM cells cannot diagnose the type of radiated noise, and different noise types have different suppression measures. Therefore, in order to design appropriate noise suppression measures, it is necessary to Carry out radiated noise mechanism diagnosis, including common-mode interference and differential-mode interference

However, existing GTEM chambers are unable to diagnose the radiation mechanism and thus cannot provide a design basis for noise suppression

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