Title :
Evaluation of the shielding effects on printed-circuit-board transformers using ferrite plates
Author :
Tang, S.C. ; Hui, S.Y.R. ; Chung, H.
Author_Institution :
Dept. of Electron. Eng., City Polytech. of Hong Kong, Kowloon, China
fDate :
6/23/1905 12:00:00 AM
Abstract :
This paper presents an effective shielding technique and a simple structure for printed-circuit-board (PCB) transformers. Performance of PCB transformers using the proposed shielding technique is evaluated using thin ferrite plates and copper sheets. Without affecting the transformer energy efficiency, the shielding method under investigation can achieve 28 dB shielding effectiveness (SE), which is much higher than the SE (about 4 dB) obtained by shielding the transformer windings with only two ferrite plates. The proposed PCB transformer structure is very simple and has high energy efficiency (>90%) for Megahertz operation
Keywords :
electromagnetic shielding; ferrites; printed circuits; transformer windings; transformers; 28 dB shielding effectiveness; PCB transformers; copper sheets; high energy efficiency; magnetic field analysis; printed-circuit-board transformers; shielding technique; thin ferrite plates; transformer energy efficiency; transformer windings; Conducting materials; Copper; Dielectrics and electrical insulation; Energy efficiency; Ferrites; Magnetic cores; Magnetic shielding; Power transformer insulation; Thermal conductivity; Windings;
Conference_Titel :
Power Electronics Specialists Conference, 2001. PESC. 2001 IEEE 32nd Annual
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-7067-8
DOI :
10.1109/PESC.2001.954402
