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http://dx.doi.org/10.5370/KIEE.2011.60.4.789

Loss Calculation of a High Power DC-DC Converter Considering DC Bias Characteristic of Inductor  

Jo, Young-Chang (LG화학 기술연구원 Battery연구소)
Choi, Ju-Yeop (광운대 전기공학과)
Jung, Seung-Ki (광운대 전기공학과)
Choy, Ick (광운대 제어계측공학과)
Song, Seung-Ho (광운대 전기공학과)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.60, no.4, 2011 , pp. 789-795 More about this Journal
Abstract
It is necessary to accurately predict converter losses for optimized design of a high-power DC-DC converter. The losses of switching devices and inductor among the elements of the converter take significantly greater proportion. The current ripple will be determined by the size of the inductance and this inductance value varies depending on the DC amount of inductor current. As the inductance changes according to load current, the change influences not only the inductor loss itself but also the total converter loss. In this paper, for more accurate design of a bi-directional DC-DC converter for 30kW-class energy storage system, more accurate computational model is proposed considering inductance variation according to the load current change. The inductance changes using variable magnetic cores are verified and converter efficiency is tested through simulations and experiments.
Keywords
DC-DC converter; Loss calculation; Converter efficiency; High-power converter; DC bias characteristic;
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