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New magnetic composite based on ferromagnetic nano-particles embedded in a polymeric material can potentially offer significant electromagnetic advantages over the polymer used to protect the ferrite in Wireless Power Transfer systems. Since the nano-particles and the strands of the litz wire are very small, brute force simulation by Finite Element Method is not possible. In this work, a method to overcome these limitations is proposed based on the use of homogenization techniques that will allow replacing both the Litz and the magnetic compound material by homogenous equivalent materials that will behave, in a macroscopic sense, as the actual material.

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The thermal management of magnetic components for power electronics is crucial to ensure their reliability. However, conventional thermal models for magnetic components are known to have either poor accuracy or excessive complexity. Contrary to these models, the use of Thermal Resistance Matrices is proposed in this paper instead, which combine both accuracy and simplicity. They are usually used to characterize semiconductor devices, but not for magnetic components. The guidelines to apply Thermal Resistance Matrices for magnetic components are discussed in detail. The accuracy of this model is validated by 3D FEA simulations and experimental results, showing an absolute error lower than 5 ∘C and a relative error between −6.4% and 3.9%, which is outstanding compared to the carried-out literature review.

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