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Coil current

Coil current

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Benjamin Izquierdo
Posted by Benjamin Izquierdo
on Feb 16 2012 04:30 AM
Prodigy135 points

Hello,

Would it be possible to know the approximate current that circulates through the transmitting coil terminals? We want to do some tests and this information would be really helpful to choose the components. The scenario would be that of a maximum 5W power delivery at the receiver's output.

Thanks for any help you can provide.

Benjamin

Transmitting coil current
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  • Bill Johns
    Posted by Bill Johns
    on Feb 20 2012 15:06 PM
    Verified Answer
    Verified by Anonymous
    Genius12540 points

    The converter is a resonate converter topology with large circulating current between the coil and capacitors. Phase of the voltage and current come into play also.  Analysis of this is not straight forward.

    Also typical system efficiency is 70%, to deliver 5W out the input power will increase to 7W.  But efficiency can decrease below this point though misalignment of receiver coil to transmitter coil.  This will make the load hard to predict.

    Our recommendation for current rating of the MOSFETS,coil, capacitors and related traces is 2A.  Increasing beyond that point will reduce losses and improve efficiency.

     

    B/R

    Bill

    Best Regards,

    Bill Johns,  Applications Engineer

    bqTESLA Wireless Power Products

    Texas Instruments Inc

    Dallas, Texas

    bqTESLA
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  • Benjamin Izquierdo
    Posted by Benjamin Izquierdo
    on Feb 21 2012 01:15 AM
    Prodigy135 points

    Thanks for your answer Bill,

    We will work under those assumptions and take into account your advice on traces resistance.

    Benjamin

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  • jessie he
    Posted by jessie he
    on Jul 30 2012 00:22 AM
    Prodigy10 points

     

    Hi Bill,

    I'm quite interested in that when there is a misalignment of receiver coil to transmitter coil, what happens for the frequency? Is it higher or lower than that of well aligned?

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