Power Loss Calculation of High Frequency Transformers

Journal of Electrical Engineering & Technology, Vol. 1, No. 3, pp. 338~342, 2006
Geun-Soo Choi*, Shin-Yong Yoon*, Soo-Hyun Baek** and Kim Yong**
Abstract – This paper analyzed the power loss of transformers considering the magnetic component.
For this, each winding strategy and the effect of air gap between the ferrite core have been an
important variable for optimal parameter calculation. Inductors are very well known design rules to
devise, but the performance of the flyback converter as a function of transformer winding strategy has
not been fully developed. The transformer analysis tool used was PExpert. The influence of the
insulator thickness, effect of the air gap, how the window height and variation of the capacitive value
effects the coil and insulator materials are some of parameters that have been analyzed in this work.
The parameter analysis is calculated to a high frequency of 48[kHz]. Therefore, the final goal of this
paper was to calculate and adjust the parameters according to the method of winding array and air gap
minimizing the power loss.

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GE estuda criação de centro de pesquisas e desenvolvimento no Brasil

A General Eletric (GE) planeja criar um centro de pesquisa e desenvolvimento no Brasil. A unidade seria a primeira da empresa na América Latina, que já conta com quatro centros ao redor do mundo: Estados Unidos, Alemanha, Índia e China. Segundo a Agência Brasil, o presidente da empresa no Brasil, João Geraldo Ferreira, pretende definir ainda no primeiro trimestre de 2010 a localidade onde a empresa implantará seu centro de pesquisa tecnológica, que deverá estar pronta até o final do ano.
Em comunciado da GE, o presidente e Chief Executive Officer (CEO) global da companhia, Jeff Immelt, diz que "o Brasil é a escolha lógica para a instalação?. Na avaliação do executivo, um laboratório de pesquisa industrial ajudará a companhia a formar parcerias mais fortes com nossos clientes.

Optimization of Powder Core Inductors of Buck-Boost Converters for Hybrid Electric Vehicles

Suwon, Korea
Gwang-Bo Choi
R&D Center
Changsung Corporation
Incheon, Korea

JNEX-Core®, amorphous and ferrite cores are compared for the
inductor of buck-boost converter for Hybrid Electric Vehicles
(HEVs). The core losses are analyzed at the condition of 10kHz
sine wave excitations. Permeability fluctuations vs. temperature
and magnetizing force will be analyzed and discussed. Under the
specifications of buck-boost converter for 20kW THS-II, the
power inductor will be designed with Mega-Flux®, JNEX-Core®
and the informative simulation results will be provided with
respect of dc bias characteristics, core and copper losses.
Keywords- HEVs; Buck-Boost Inductor; High power density;
Low core loss; Thermal stability; Leakage flux

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