2003•Proceedings of the CSEERequires access

RESEARCH ON COMMON-MODE CONDUCTED EMI OF DC POWER SUPPLY WITH A THREE PHASE INVERTER

Junhong Zhang

Abstract

In this paper, common-mode conducted electromagnetic interference (CM EMI) of DC power supply with a 3-phase inverter is researched. Based on the study of CM EMI spreading paths, a new CM EMI frequency-domain equivalent circuit is presented, and a CM EMI source generated by power electronic switches is also studied. By using the measured frequency-domain impedance characteristic of motor and devices in experiment, CM EMI of the DC power supply system with a 3-phase inverter is studied between OHz and 150kHz. The result is agreed with experiment results. Therefore, the CM EMI frequency-domain equivalent circuit and CM EMI source proposed in paper are valid. Besides, some CM EMI characteristics of the system are given.

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Key concepts: EMI, Electromagnetic interference, Inverter, Common-mode signal, Electrical engineering, Conducted electromagnetic interference, Power (physics), Electronic engineering