Some electromagnetic aspects of coreless PCB transformers

Author

Hui, S. Y Ron ; Tang, S.C. ; Chung, Henry Shu-Hung

Author_Institution

Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China

Volume

15

Issue

4

fYear

2000

fDate

7/1/2000 12:00:00 AM

Firstpage

805

Lastpage

810

Abstract

In this paper, some EMI aspects of using coreless PCB transformers are addressed. Based on the antennas theory, the radiated power of a coreless PCB transformer is estimated and found to be negligible. The electromagnetic field plot of a power electronic circuit using a gate drive circuit isolated by a coreless PCB transformer has been recorded. The major radiated EMI source in the frequency range of 30 MHz to 300 MHz is found to be the copper tracks of the power circuit, where switching transients occur, rather than the coreless PCB transformer. Coreless PCB transformers essentially operate at relatively low frequency (8 MHz in this case) by near-field magnetic coupling. Experimental results have confirmed that the application of coreless PCB transformer in gate drive circuit will not impose any serious EMI problem on the power electronic circuit

Keywords

electromagnetic interference; printed circuits; switching transients; transformer windings; transformers; 30 to 300 MHz; 8 MHz; antennas theory; coreless PCB transformers; electromagnetic aspects; gate drive circuit; near-field magnetic coupling; radiated EMI source; radiated power; switching transients; Antenna theory; Circuits; Copper; Electromagnetic fields; Electromagnetic interference; Electromagnetic radiation; Frequency; Magnetic cores; Power electronics; Transformer cores;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.849052

Filename

849052