Model and simulation on common mode radiation of a flyback power supply

Author

He, Junping ; Gao, Yuan ; Ji, Kejian

Author_Institution

Shenzhen Grad. Sch., Shenzhen Univ. Town, Shenzhen, China

fYear

2012

fDate

21-24 May 2012

Firstpage

117

Lastpage

120

Abstract

It´s well known a switched-mode power supply is easily to produce strong electromagnetic radiation emission and fails in EMC test for its RFI exceeding limits between 30MHz-200MHz. Based on asymmetry line antenna theory, a novel far field common mode radiation model, including an equivalent driving source, radiation structure and some key influence factors, is identified and built up for a small flyback power supply. Radiation characteristics of this model are predicted by using Ansoft HFSS and its effectiveness is verified by experiment. In the end, the radiation role of some key factors, such as the length of output cable, CM impedance of AC grid, layout of cable and reflected ground, are studied using simulation in detail.

Keywords

antenna theory; electromagnetic waves; power cables; power engineering computing; power grids; radiofrequency interference; switched mode power supplies; AC grid; Ansoft HFSS; CM impedance; EMC test; RFI exceeding limits; asymmetry line antenna theory; cable layout; cable length; common mode radiation; electromagnetic radiation emission; far field common mode radiation model; flyback power supply; frequency 30 MHz to 200 MHz; radiation structure; switched-mode power supply; Analytical models; Electromagnetic compatibility; Heating; Impedance; Layout; Radio frequency; Switched-mode power supply;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility (APEMC), 2012 Asia-Pacific Symposium on

Conference_Location

Singapore

Print_ISBN

978-1-4577-1557-0

Electronic_ISBN

978-1-4577-1558-7

Type

conf

DOI

10.1109/APEMC.2012.6237800

Filename

6237800