Characterizations of High Frequency Planar Transformer With a Novel Comb-Shaped Shield

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Title Characterizations of High Frequency Planar Transformer With a Novel Comb-Shaped Shield
Author Lu, Junwei; Dawson, Francis
Journal Name IEEE Transactions on Magnetics
Year Published 2011
Place of publication United States
Publisher IEEE
Abstract This paper presents a newly developed comb-shaped Faraday shield for high frequency (HF) planar transformers. High power density and small size planar transformers are widely used in switching mode power supplies (SMPS) as magnetically coupled devices. However, the intra-winding capacitance couples HF noise from the primary winding to the secondary winding. The coupling capacitance can cause serious common mode problems, and thus the design may not be electromagnetically compatible with the surrounding environment. The tradeoff between the leakage inductance and the coupling capacitance becomes problematic for high frequency applications. The coupling capacitance can be reduced either by increasing the separation distance between the primary and the secondary windings or by inserting a conventional Faraday shield. The former may cause the leakage inductance to increase and further increase the insertion losses, whereas the latter would result in a serious demagnetizing problem in a HF planar transformer. These problems can be resolved by using a novel comb-shaped Faraday shield.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1109/TMAG.2011.2157664
Volume 47
Issue Number 10
Page from 4493
Page to 4496
ISSN 0018-9464
Date Accessioned 2012-01-04; 2012-03-09T05:21:15Z
Date Available 2012-03-09T05:21:15Z
Research Centre Centre for Wireless Monitoring and Applications
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Renewable Power and Energy Systems Engineering (excl Solar Cells)
URI http://hdl.handle.net/10072/43481
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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