stwlc38, stwbc86

[lighthouse0625]

Hi I am working on a project using stwlc38 and stwbc86.

They charge well, but the charging distance is an issue.

I need it to be able to charge at a distance of around 2.5T, but when I go beyond 2T it won't charge.

So, I put a Tx coil like the one I used on a ready-made Tx module and tested it, and it charges up to 2.5T.

What should I improve to increase the charging distance?
Rx, Tx, Coil, or any method, please let me know if you have any suggestions. Thanks!

The product used is the 5W product

 

[willzhou]

Hi 

For increase the charging distance, you need to change TX/RX coils

please check this AN or google "how to increase coils coupling coefficient"

https://www.st.com/resource/en/application_note/an5961-wireless-power-transfer-coil-design-stmicroelectronics.pdf

Also you can set TX input voltage larger, for example 9V.