The input impedance of common mode and differential mode noise separators

Author

Kostov, Konstantin S. ; Nee, H.-P. ; Priecinsky, Martin

Author_Institution

Dept. of Electr. Energy Conversion, KTH R. Inst. of Technol., Stockholm, Sweden

fYear

2013

fDate

15-19 Sept. 2013

Firstpage

1688

Lastpage

1695

Abstract

This paper discusses the Δ-networks and other circuits designed to separate the conducted electromagnetic interference (EMI) into its common mode (CM) and differential mode (DM) components. The input impedances of CM/DM separators must be 50 Ω resistive in the measurement frequency band and they must be independent of the values of the noise signals and noise source impedances. The conditions for achieving such input impedances are derived. It is shown that many of the proposed separators, including the Δ-network suggested in the CISPR 16 standard, do not fulfill the input impedance requirement. This leads to unreliable CM and DM measurements, and consequently, to EMI filter oversizing and design by trial-and-error.

Keywords

electromagnetic interference; filtering theory; Δ-networks; CISPR 16 standard; CM measurements; CM-DM separators; DM measurements; EMI filter; common mode input impedance; conducted electromagnetic interference; differential mode components; differential mode noise separators; impedance requirement; noise signals; noise source impedances; Electromagnetic interference; Impedance; Impedance measurement; Noise; Particle separators; Standards; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition (ECCE), 2013 IEEE

Conference_Location

Denver, CO

Type

conf

DOI

10.1109/ECCE.2013.6646910

Filename

6646910