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LMG1210: What is the maximum distance between a wireless power transmitter and the antenna, and how to handle this with best practices

Ricardo Cervantes
Prodigy 140 points
Part Number: LMG1210


HI,

We are designing a wireless power transmitter, and we need to separate the antenna from the transmitter due to space availability. actually we are using the "LMG1210" with GAN FET to 6.78Mhz mosfet and a tuner circuit.

For which we need to have information or guidance on how we can manage the antenna at a distance, we are talking about 10cm. We have seen designs where the antenna cable is twisted, and they have it at short distances.There is information about this topic or how we can ensure in the design that this works for us.

Thank you so much.

  • 0
    TI__Guru* 76336 points

    Hello

    The Two coil in the photo are designed for Qi transmitters that operate between 100kHz and 200kHz, not sure they have been tested to 6.78MHz.  Larger one is 24uh and smaller one is 6uH, this seems high.  The coils that I have seen for this freq range have been much lower L values and often PCB designs.

    Sorry but TI is not designing wireless power devices to operate at this freq and do not have reference designs to support this distance or freq.

  • 0 in reply to Bill Johns
    Prodigy 140 points

    Thank you very much for the answer, the images are only for reference on the antenna connections.


    I will continue looking for information on antennas at 6.75Mhz and the distance to the driver.