yes, the main board which located in the USB plug can identify the signal.
First, the electromagnetic signal will establish a handshake with the mobile phone signal.
The motherboard can identify the current mainstream mobile phone models
Then, according to the specific adjustment of the mobile...
Check my art
DIY a wireless charger into a book
how it looks like after finish
here is the video:
DIY a wireless charger into a book
the brand is Soopus-X if you ask