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BQ51013B: Suitable Rx Coil and Resonance Circuit

Russell Corker
Prodigy 20 points
Part Number: BQ51013B

Hello,

I'm using the BQ51013BRHLR wireless charging IC as part of a wireless charging circuit design.

The Datasheet recommends certain Rx coils and their Inductances, (Ls and Ls'), to allow for the resonance circuit to be calculated, to WPC standards.

With the design I have currently the coils size is too big for the board, 50mm diameter. I was wondering if you are able recommend a suitable Rx coil and resonance circuit for this board size requirement.

If you can't that's no problem, I will just have to perform the test a suitable coil to calculate the resonance circuit, I thought I'd ask here before purchasing the items required for the test.

Many thanks for your help.

Datasheet for the product in question: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=26&gotoUrl=https://www.ti.com/lit/gpn/bq51013b

  • 0
    TI__Mastermind 23410 points

    Hi Russel,

    Welcome to E2E!

    A good place to start would be any of the following coils. We've used these for the BQ51013xEVMs. 

    IWAS-4832FF-50 Vishay

    WR-483250-15M2-G

    TDK 760308201 Wyrth

    You can also use the capacitors used in the EVM User Guide schematic as a basis for the resonant circuit portion of the BQ51013B circuit.

  • 0 in reply to Anthony P Pham
    Prodigy 20 points

    Hi Anthony,

    Thank you for the reply, unfortunately the coils above are too big to fit on the back of the board. The PCB in question is 50mm in diameter and has a housing that it needs to sit within, the coil needs to sit comfortably within the 50mm diameter PCB, the coil will sit on the back of the PCB.

    I was wondering if Texas Instruments has experience with a Rx coil, used for wireless charging, with a smaller form factor that could fit within the 50mm diameter PCB and of the resonance circuit needed to accompany the Rx coil. It's no problem if a smaller Rx coil cannot be recommended.

    Thank you for your help, it's much appreciated. If you need any more information, please don't hesitate to ask. 

  • 0 in reply to Russell Corker
    TI__Mastermind 23410 points

    Hi Russell,

    Ah apologies, I wasn't too familiar with the size at first glance. 50mm is quite small. Let me spend some time looking into this, I'll get back to you soon on this.

    Best Regards,

    Anthony Pham

  • 0 in reply to Russell Corker
    TI__Mastermind 23410 points

    Hey Russell,

    Just wanted to get back to you and say I wasn't able to find anything on a small receiver coil of that size but if youd o have the Ls and Ls' measurements, you'll be able to calculate the series and parallel capacitors according to the formulas in the datasheet. 

    I'm able to help if you have a design already and are seeing any abnormal behavior.

    I'll update if I find any information regarding a small coil size. 

    Best Regards,

    Anthony Pham