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- Title
Measurement and Analysis of Conducted Electromagnetic Interference inside 3 kW Microwave Source.
- Authors
FENG Qiang; LIAO Cheng; XIONG Xiang-zheng; YE Zhi-hong
- Abstract
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 commonmode (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 phenomenon that interference on neutral line and DM interference show a good concordance in terms of peak value indicates DM interference is in dominant on neutral line. Knowing about these interference distribution is helpful for proposing efficient interference suppression method.
- Subjects
ELECTROMAGNETIC interference; POWER electronics; ELECTRIC lines; MICROWAVE circuits; INTERFERENCE spectrometers
- Publication
Telecommunication Engineering, 2014, Vol 54, Issue 6, p835
- ISSN
1001-893X
- Publication type
Article
- DOI
10.3969/j.issn.1001-893x.2014.06.026