The Faraday Shields Loss of Transformers

Zhan Shen, Murat Kaymak, Huai Wang, Jingxin Hu, Long Jin, Frede Blaabjerg, Rik W. De Doncker

    Research output: Contribution to journalArticlepeer-review

    12 Scopus citations


    Faraday shields are widely used in high-frequency transformers to conduct the common-mode (CM) current to the ground. They are normally located in the high magnetomotive force (MMF) region, where severe eddy currents are induced and contribute considerable magnetic field losses. In this article, an analytical procedure is presented for the magnetically-induced loss in Faraday shields. It is originally derived from shields of foil conductors. Then, it is extended to different shields with round and Litz wire, and different configurations, e.g., multilayer shields, interleaved windings, and coaxial transformers. It is verified by the finite element method (FEM) and experimental results in six case studies. Moreover, the criteria to determine the losses of Faraday shields is given and a design procedure is presented to reduce the shield losses at a certain level while keeping the functionality. Finally, a case study is provided to verify the shield design procedure on a 100-kHz transformer.

    Original languageBritish English
    Article number9044420
    Pages (from-to)12194-12206
    Number of pages13
    JournalIEEE Transactions on Power Electronics
    Issue number11
    StatePublished - Nov 2020


    • Common-mode (CM) current
    • eddy current
    • faraday shield
    • isolation transformer
    • winding losses


    Dive into the research topics of 'The Faraday Shields Loss of Transformers'. Together they form a unique fingerprint.

    Cite this