Active EMI filter for switching noise of high frequency inverters

Author

Takahashi, Isao ; Ogata, Akihiro ; Kanazawa, Hidetoshi ; Hiruma, Atsuyuki

Author_Institution

Nagaoka Univ. of Technol., Niigata, Japan

Volume

1

fYear

1997

fDate

3-6 Aug 1997

Firstpage

331

Abstract

In high frequency inverter fed AC motor systems, high frequency leakage current generated by high dv/dt at switching times flows to the ground wire through the stray capacitor between motor windings and core. This paper proposes an active EMI filter to compensate common mode current using high frequency transistors as active elements and a high frequency common mode CT. It works just as a power active filter in the harmonic compensation in the power system. The leakage current is actively suppressed to under 1/50 of the uncompensated circuit. The proposed method is also effective to decrease the EMI more than 40 dBμV

Keywords

AC motor drives; active filters; compensation; electromagnetic interference; interference suppression; invertors; leakage currents; power filters; power system harmonics; switching circuits; active EMI filter; common mode current compensation; ground wire; harmonic compensation; high frequency common mode current transformer; high frequency inverter fed AC motor systems; high frequency inverters; high frequency leakage current; high frequency transistors; leakage current suppression; motor core; motor windings; power active filter; room air conditioner; stray capacitor; switching; switching noise; AC generators; AC motors; Active filters; Active noise reduction; Electromagnetic interference; Frequency; Inverters; Leakage current; Power harmonic filters; Power system harmonics;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Conversion Conference - Nagaoka 1997., Proceedings of the

Conference_Location

Nagaoka

Print_ISBN

0-7803-3823-5

Type

conf

DOI

10.1109/PCCON.1997.645634

Filename

645634