Measurement and Analysis of Conducted Electromagnetic Interference inside 3 kW Microwave Source

Electromagnetic interference (EMI) inside the microwave source case can couple outside along the power lines to affect other power electronic equipment when it is working. There exists many literatures for research on conducted EMI of the three-phase input power lines, in which the separated common...

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Bibliographic Details
Published in:Dianxun Jishu / Telecommunications Engineering 2014-06, Vol.54 (6), p.835-839
Main Authors: Feng, Qiang, Liao, Cheng, Xiong, Xiang-Zheng, Ye, Zhi-Hong
Format: Article
Language:Chinese
Subjects:
Analyzers
Calibration
Electromagnetic interference
Electronic equipment
Interference
Microwaves
Noise levels
Power lines
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Summary:Electromagnetic interference (EMI) inside the microwave source case can couple outside along the power lines to affect other power electronic equipment when it is working. There exists many literatures for research on conducted EMI of the three-phase input power lines, in which the separated common - mode (CM) current and differential-mode (DM) current between three-phase lines are only considered, but the analysis of conducted EMI on neutral line is absent. In this paper, a current sensor, which is calibrated in a vector network analyzer, is used to measure the conducted EMI of 3 kW magnetron microwave source power lines, then the interference current on phase line and neutral line at 150 kHz ~ 30 MHz is obtained, and the CM and DM current is separated. EMI mode on the neutral line is analyzed by comparing the DM current spectrum with the interference spectrum on the neutral line. The tested data shows that DM interference magnitude is above 10 dB larger than CM interference at 150 kHz ~ 8 MHz, and the pheno
ISSN:1001-893X
DOI:10.3969/j.issn.1001-893x.2014.06.026