Method for testing radiation electromagnetic interference noise by using GTEM chamber

Abstract

The invention relates to a method for testing radiation electromagnetic interference noise by using a GTEM chamber. The method is implemented by arranging the equipment to be tested on a turntable of the GTEM chamber, rotating the turntable sequentially along x, y and z dimension to several angles, measuring the x dimension voltage containing radiation electric field information between the core plate and bottom plate of the GTEM chamber when the equipment to be tested rotates to each angle to obtain electric dipole moment and magnetic dipole moment, and the formulae of radiation electric field and radiation magnetic field are obtained via the electric dipole moment and the magnetic dipole moment by using a multi-pole moment model; test distances required by various types of test standards are substituted into the formulae of radiation electric field and radiation magnetic field in step five to obtain the results required by corresponding test standards. In the method, the test data of GTEM chamber are converted into results of various test standards, thus being favorable for judging whether the equipment to be tested can be subject to electromagnetic compatibility test.

Description

technical field [0001] The invention relates to the application of a GTEM cell, in particular to a method for testing radiated electromagnetic interference noise by using the 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. On the other hand, the parasitic parameters of the system generated by the high-speed switching of the switching elements in the power electronic equipment make the equipment suffer from conducted radiation 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 and development costs, it is also necessary for the product to pass the radiated EMI test for the product through the quality inspection department. [0...

AI Technical Summary

Problems solved by technology

However, most of the existing GTEM cells are electromagnetic immunity measurement equipment, which cannot complete the radiated EMI test; for a small number of GTEM cells that can perform radiated EMI tests, since the frequency of the radiated noise of the device under test is between 30MHz and 1GHz, It is impossible to judge whether it is a near-field test, a far-field test or a near-far field transition field test

The noise generated by the device under test has different radiation characteristics in the near field, far field or near field-far field transition field, so the existing GTEM capable of radiated EMI testing cannot convert the test results into standard test results, and cannot Determine whether the device under test has passed the electromagnetic compatibility test

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