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Power transmission over 15mm

Hi community,

I'm looking for a solution for Wireless Charging of 5W or 10W, with a distance between coils of about 15mm.

I'm designing both transmitter and Receiver, so no need for standard like WPC, PMA or A4WP, a custom protocol could be used.

15mm gap cannot be reached with Inductive technology like QI or PMA, am I right?

But resonant one, like A4WP, or a custom frequency around few MHz could be used, is that correct?

Is there any TI solution for that system?

Best regards.

Vincent