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NXQ1TXH5 Transmitter Design Support

Question asked by Deniz Sinoplu on Mar 30, 2020
Latest reply on Mar 31, 2020 by G.w. Sun

Hi NXP Community,

 

I am trying to develop a Wireless Charging Transmitter and designing a charging dock by using NXQ1TXH5 One chip solution. I followed the application note shared on product page as much as possible. I am using WE760308101103 receiver and WE760308101111E transmitter coils in my design. When I put two bare coils on top of each other when powered, wireless charging is active and power transfer level is quite good (actually receiver end pcb is getting quite warm in short time). But when there is a Plexiglas material with 2mm thickness in between coils, transmitter circuit is not able to detect the receiver coil and no power transfer is occuring. AS far as I know with Qi WPC v1.2 A11 standard should be fine with even higher distance, but this problem confused me. I am sharing my transmitter sketch and BOM in attachment. Can somebody give me an opinion where the problem would be causing from ? Thanks.

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