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Resonant frequency difference on Tx and Rx

Vijay Gandhi1
Prodigy 70 points

Hello There,

I see that the 412 EVM(A6) resonant frequency is set at 122kHz.

What are the driving factors to choose 122kHz, where as the RX EVM(13B) has its resonant frequency to be set at 100kHz(also WPC recommendation)?

Also why is resonant frequency of each type of TX is different?(WPC recommends it but why?)

Shouldn't we be achieving more power transfer and better Z at resonance(same resonance freq on Tx and Rx)?

Didn't quite understand this in detail, pls help understand.

Thanks,

Vijay Gandhi M

  • 0
    TI__Guru* 75806 points

    Different WPC coil types will often have different physical dimensions and performance.  The A6 coil is larger than the A1 type and has higher voltage gain.  The larger coil can generate voltages in the RX possibly too high.  If the 100kHz resonant freq is use and operating range of 205kHz to 110kHz voltage generated could damage the RX.  To offset this and reduce the risk of damage to the RX the resonant point is increased and gain is reduced.