High frequency characteristic analysis of EMI filter in switch mode power supply (SMPS)

Author

Liu, D.H. ; Jiang, J.G.

Author_Institution

Dept. of Electr. Eng., Tsinghua Univ., Beijing, China

Volume

4

fYear

2002

fDate

2002

Firstpage

2039

Lastpage

2043

Abstract

In a switch mode power supply (SMPS), the EMI filter plays an important role in suppressing common mode (CM) and differential mode (DM) conducted emissions. In this paper, the high frequency characteristic of an input filter is analyzed. Its frequency characteristic measured by a network analyzer is compared with simulation results based on models with/without parasitic parameters respectively. The effect of the parasitic parameters of capacitors and CM inductors is analyzed and discussed using the parameter sensitivity analysis, which gives a reference to design the EMI filter and to deal with high frequency problems of filters

Keywords

electromagnetic interference; filters; interference suppression; switched mode power supplies; 1 kW; EMI filter; SMPS; capacitors; common mode conducted emissions suppression; differential mode conducted emissions suppression; frequency characteristic; high frequency characteristic analysis; input filter; network analyzer; parameter sensitivity analysis; parasitic parameters; switch mode power supply; Analytical models; Capacitors; Delta modulation; Electromagnetic interference; Filters; Frequency measurement; Inductors; Sensitivity analysis; Switched-mode power supply; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 2002. pesc 02. 2002 IEEE 33rd Annual

Conference_Location

Cairns, Qld.

Print_ISBN

0-7803-7262-X

Type

conf

DOI

10.1109/PSEC.2002.1023114

Filename

1023114