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Ferrite for Wireless Power Transfer

Discussion in 'General Electronics Discussion' started by Firenze02, Jan 5, 2019.

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  1. Firenze02


    Jan 5, 2019
    I'm working on a wireless power transfer project (operating frequency 100 kHz). As you probably know, ferrite is usually placed under the coil to create a low reluctance way and reduce the leakage flux.

    How the coecive force Hc and the residual magnetic flux Br affect the hysteresis losse?

    For example, in the attached file you can find different ferrite types with different Hc and Br.

    What is the logical reasoning with which I should choose a soft ferrite with high Hc and low Br or viceversa?

    Thank You.

    Attached Files:

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    It is not directly Hc and Br that create the magnetic losses, it is the area enclosed by the hysteresis loop. Apart from Hc and Br that area is also defined by the slope of the B/H curve. You'll want to minimize that area. See e.g. here.
    hevans1944 and Firenze02 like this.
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