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Conductive common-mode/differential-mode noise separation method

A technique of differential mode noise, separation method, applied in the direction of noise figure or signal-to-noise ratio measurement, etc.

Inactive Publication Date: 2014-05-28
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a conductive common mode / differential mode noise separation method, which can effectively solve the noise extraction and common mode / differential mode noise separation problems on the single-phase system power line

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  • Conductive common-mode/differential-mode noise separation method
  • Conductive common-mode/differential-mode noise separation method
  • Conductive common-mode/differential-mode noise separation method

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Embodiment Construction

[0050] Below in conjunction with accompanying drawing, the present invention is further described: the present invention's measurement step is as follows:

[0051] 1. Prepare to access the measurement environment and connect the measurement equipment:

[0052] The device prepared in this embodiment includes: a commercial switching power supply 3, a current probe 5 (produced by Beijing Daze Company, model ZN23101), a current probe calibration device 6 (produced by Beijing Daze Company, model ZN23302), and a linear impedance stabilization network 1 (produced by Beijing Daze Company, model ZN3770A), one spectrum analyzer 4 (produced by American Agilent Company, model N9000A), one set of vector network analyzer 2 (produced by American Agilent Company, model E5071C), standard calibration parts ( American Agilent Company, model 85032E), a set of coaxial cables with a characteristic impedance of 50Ω, and a computer.

[0053] The linear impedance stabilization network 1 is used to is...

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Abstract

The invention discloses a conductive common-mode / differential-mode noise separation method, belonging to the technical field of conductive electromagnetic compatibility noise measurement. Radiofrequency current probe measurement and software separation calculation are combined, and the method is suitable for conductive interference measurement on a single phase line. The method comprises the following measuring steps: I, directly measuring a phase line, center line and common-mode conducted interference spectrum by using a radiofrequency current probe, connecting the output end of the current probe to a spectrometer through a coaxial line, and driving the spectrometer to work in a peak detection mode; II, calibrating interference spectrum data obtained in the step I, and measuring the transmission admittance of the current probe and the coaxial line used in the step I by using a vector network analyzer; III, putting the corrected data IL, IN and ICM into a formula to obtain a differential-mode current spectrum IDM so as to obtain the interference voltage in a differential mode and a common mode. By adopting a test method, the conducted interference spectrum on each line can be measured rapidly, and separation of common-mode and differential-mode interference is realized. The method is mainly applied to online measurement of electromagnetic compatibility noise.

Description

technical field [0001] The invention belongs to the technical field of conductive electromagnetic compatibility noise measurement. technical background [0002] The widespread use of power electronics has brought increasingly serious electromagnetic interference problems. Conducted electromagnetic interference noise is divided into two modes: common mode noise and differential mode noise. In a single-phase system, the differential mode noise exists between the phase line and the neutral line, and the common mode noise refers to the interference voltage of the phase line or the neutral line to the ground. Before the product leaves the factory, it is necessary to measure the interference generated during its operation, and design reasonable and effective suppression methods according to the standard restrictions and interference data. For the different characteristics of common-mode noise and differential-mode noise, designers need to come up with different suppression metho...

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Application Information

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IPC IPC(8): G01R29/26
Inventor 熊祥正廖成冯强冯菊叶志红周大瑜唐丽娟
Owner SOUTHWEST JIAOTONG UNIV
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