The passive EMI cancellation effects of Y capacitor and CM model of transformers used in switching mode power supplies (SMPS)

Author

Chen, Pingping ; Zhong, Honghao ; Qian, Zhaoming ; Lu, Zhengyu

Author_Institution

Coll. of Electr. Eng., Zhejiang Univ., Hangzhou, China

Volume

2

fYear

2004

fDate

20-25 June 2004

Firstpage

1076

Abstract

Connecting a Y-safety capacitor between the primary return line terminal and the secondary return line terminal is a very common measure in EMI design for an isolated switching mode power supplies (SMPS). Why this Y-safety capacitor can improve EMI performance of SMPS is not so well known. Analysis of the passive EMI cancellation effect of this Y-safety capacitor has been carried out and experimentally evaluated. And an accurate and simple CM (common model) model of transformer has been discussed.

Keywords

capacitors; electromagnetic interference; interference suppression; switched mode power supplies; transformers; EMI design; Y-safety capacitor; passive EMI cancellation effects; return line terminal; switching mode power supplies; transformer model; Capacitors; Diodes; Educational institutions; Electromagnetic interference; MOSFET circuits; Parasitic capacitance; Power measurement; Predictive models; Switched-mode power supply; Transformers;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 2004. PESC 04. 2004 IEEE 35th Annual

ISSN

0275-9306

Print_ISBN

0-7803-8399-0

Type

conf

DOI

10.1109/PESC.2004.1355570

Filename

1355570