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Finite Element Analysis of Inductor Core Loss Under DC Bias Conditions

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4 Author(s)
Mingkai Mu ; Center for Power Electron. Syst., Virginia Polytech. & State Univ. (Virginia Tech), Blacksburg, VA, USA ; Feng Zheng ; Qiang Li ; Lee, F.C.

Finite element analysis is a popular way to analyze magnetic core loss in complex core structures. However, accurate calculation of the inductor core loss under dc bias conditions is still a challenge, as magnetic properties such as permeability and core-loss density change when a dc premagnetization is present, especially for saturable cores. This paper proposes a method that can accurately calculate the inductor's loss when it works under dc bias current conditions. The method utilizes an effective and simple material model built by curve-fitting the measurement data. To prove the accuracy of this approach, planar inductors built with low-temperature co-fired ceramic ferrite are simulated, and the calculated core losses are experimentally verified.

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Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 9 )