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GTEM cell radiation EMI (electro-magnetic interference) test method based on radiation source characteristic

A test method and radiation source technology, applied in the field of radiated EMI testing of GTEM cells, can solve the problems of no noise source classification and low accuracy, and achieve the effect of improving the accuracy of test results

Inactive Publication Date: 2013-04-17
NANJING NORMAL UNIVERSITY
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Problems solved by technology

[0004] Technical problem to be solved by the present invention: Aiming at the problems of low accuracy and no noise source classification when using the GTEM cell for radiated EMI testing, the present invention provides a range-mean measurement method based on the common mode radiation model And the variance measurement method based on the differential mode radiation model

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  • GTEM cell radiation EMI (electro-magnetic interference) test method based on radiation source characteristic
  • GTEM cell radiation EMI (electro-magnetic interference) test method based on radiation source characteristic
  • GTEM cell radiation EMI (electro-magnetic interference) test method based on radiation source characteristic

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Embodiment Construction

[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] In the application of the GTEM cell to measure electromagnetic interference noise, it is necessary to convert the data measured by the GTEM cell into an equivalent open field or anechoic chamber test field strength value. The research on the GTEM cell as a radiated EMI test device mainly includes: total power method, Wilson and Lee, these three correlation algorithms. Among them, the Wilson algorithm is developed on the basis of the total power algorithm. For an electrically small-sized radiator, the components of the radiation field strength in the three directions of x, y, and z can be calculated using the electric dipole moment and magnetic dipole moment to describe. Taking the x direction as an example, the radiation electric field component of the measured object in the far field can be expressed as:

[0016] ...

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Abstract

The invention discloses a GTEM cell radiation EMI (electro-magnetic interference) test method based on the radiation source characteristic. The method comprises the following steps of: 1) according to the near field wave impedance theory, judging the radiation source type of equipment to be tested, i.e. judging whether the radiation source is based on common-mode radiation or differential-mode radiation; 2) if the radiation source type of equipment to be tested is based on the common-mode radiation characteristic, processing a GTEM result with an extreme difference-averaging method; and if the radiation source type of tested equipment is based on the differential-mode radiation characteristic, processing the GTEM result with a variance method. By aiming at a test experiment used for the radiation emission for a GTEM cell, the GTEM cell radiation EMI test method based on the radiation source characteristic has the characteristic that the test result accuracy obtained when the GTEM cell is used for the radiation EMI test can be greatly improved, and an effective reference is provided for the GTEM-based radiation EMI measurement.

Description

technical field [0001] The present invention relates to a GTEM cell radiation EMI test method based on the characteristics of radiation sources. Specifically, it proposes different GTEM test methods for different radiation source types in view of the poor accuracy of the EMI test using the GTEM cell at present. It provides an effective reference for the use of GTEM for radiated EMI testing, and belongs to the field of electromagnetic compatibility technology. Background technique [0002] Modern electronic products are developing toward miniaturization and intelligence. The frequency of switching devices is getting higher and higher, and the design is more complex, which makes the equipment suffer from radiation electromagnetic interference. The requirements for the anti-interference ability of the system are getting higher and higher. Therefore, in order to save product development costs and time, it is essential to conduct radiated electromagnetic interference noise test r...

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Application Information

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IPC IPC(8): G01R31/00
Inventor 赵阳张宇环刘勇窦爱玉夏欢陈旸颜伟周荣锦
Owner NANJING NORMAL UNIVERSITY
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