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segunda-feira, 3 de fevereiro de 2014

High Frequency (MHz) Planar Transformers for Next Generation Switch Mode Power Supplies Radhika Ambatipudi Mid Sweden University Doctoral Thesis 159 - 2013


High Frequency (MHz) Planar Transformers for
Next Generation Switch Mode Power Supplies
Radhika Ambatipudi
Supervisors
Associate Professor Kent Bertilsson
Professor Bengt Oelmann
Department of Electronics Design
Mid Sweden University, SE-851 70 Sundsvall, Sweden

ABSTRACT
Increasing the power density of power electronic converters while reducing or maintaining the same cost, offers a higher potential to meet the current trend in relation to various power electronic applications. High power density converters can be achieved by increasing the switching frequency, due to which the bulkiest parts, such as transformer, inductors and the capacitor's size in the converter circuit can be drastically reduced. In this regard, highly integrated planar magnetics are considered as an effective approach compared to the conventional wire wound transformers in modern switch mode power supplies (SMPS). However, as the operating frequency of the transformers increase from several hundred kHz to MHz, numerous problems arise such as skin and proximity effects due to the induced eddy currents in the windings, leakage inductance and unbalanced magnetic flux distribution. In addition to this, the core losses which are functional dependent on frequency gets elevated as the operating frequency increases. Therefore, this thesis provides an insight towards the problems related to the high frequency magnetics and proposes a solution with regards to different aspects in relation to designing high power density, energy efficient transformers
LINK
http://miun.diva-portal.org/smash/get/diva2:665725/FULLTEXT01.pdf

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