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Receiver Coil without ferrite

Other Parts Discussed in Thread: BQ500210, BQ51013B

I want to perform some experiments with the Wireless Power evaluation kit  BQ500210 EVM-689 (transmitter module) and the BQ51013B EVM-764 (receiver) module,

but I'm interested in using a receiver coil without the ferrite shielding substrate.

Is it easy to remove the ferrite sheet from the commercial coil/shield components or shall I purchase just coils?

Are there standardised Litz-wire coils for this application?

Thank you in advance.

  • Babis,

    I would not recommend running without the ferrite shields in place.  The ferrite helps contain and focus the magnetic field.  Without the shield, the magnetic field will potentially heat up any metal in its field.  Please see the application note "Designing a Qi-compliant receiver coil for wireless power systems, Part 1" which can be found at www.ti.com/wirelesspower.  Look in the Technical Documents tab and you can use the "Search Technical Documents" section to locate it.

    To directly answer your question, the coils are usually glued or taped to the ferrite shield.  Depending on the coil, separating the coil from the shield could range from easy to difficult.

    Many of the EVM kits use Litz wire coils.

    Regards,

    Dick

  • Thank you Dick.

    Yes, I know about the importance of magnetic shielding.

    Actually my goal is to change the type of shielding under the coil, but it seems I'll have first to try removing the commercial sheet to see how easy it is.

    Regards,

    Babis