So I recently discovered that my phone, a Nexus 5, has Qi wireless charging capabilities. I was wondering if it is possible to make my own charging coil with 24/26awg wire that would look something like this (but without the driver circuit).
Then, I would use a micro controller/build my own circuit to drive it at the correct frequency with a DC to AC converter. I was wondering if this would work, how precisely I would have to make the coil, and if I am missing something about Qi charging completely. I ask this because there are very few internet resources on homemade Qi coils.
Best Answer
The Qi wireless charging protocol involves a complicated communication handshake from receiver (target device) to transmitter in order to enable charging. It is not trivial and requires strict timing. You 100% could make your own coil and driving circuit but it would be an endeavor for the sake of bragging to do it. The standard is open but you need to be a member of the wireless power consortium to get full access. See http://www.low-powerdesign.com/article_TI-Qi.html for some details.