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How to change the comm capacitor if I want to use a small coil?

Fan Yang22
Intellectual 390 points

Dear TIers:

I want to build a wireless charging circuit used for the wearable devices? Can I change the change the coil to 10mm? How can I change comm capacitor without affecting the communication between Tx and Rx? Because I use Bq40012evm for my transmitter now, how can I solve the coupling issue? Thank you.

Best regards,

Yang Fan

  • 0
    TI__Genius 14890 points
    Yang,
    A 10mm RX coil is not going to couple well with a standard Qi TX coil. Changing the comm caps will not add much improvement. The 10mm coil, in most cases, cannot deliver enough power to get the system working.
    Regards,
    Dick