Poundland inductive phone charger teardown (with schematic)

I think this is a very common style that is available from many sources. The circuitry is very typical of QI chargers. It pulses the output until it gets a response from a compatible device, and then transfers power inductively to the device being charged. QI devices are notorious for their inefficiency and the need for good alignment for optimal charge transfer. But the huge advantage is the convenience of charging and the lack of wear and damage risk to a traditional charge connector. The control chip is a mystery. I've a sneaky feeling that it's a 16 pin microcontroller with a bit of clever software to deal with the communication and coil driving via a MOSFET H-bridge. It will also be determining the type of power source it's plugged into by measuring USB data line voltage levels. Since the operation involves communication, it's possible that it's a microcontroller with dedicated QI charging functionality, since that would make it easier to implement the comms and adapt it to an evolving standard. The unusual wire coil is Litz wire used for very high frequency applications to minimise the skin effect of current preferentially flowing at the surface of a conductor at high frequencies. It's basically a bundle of thin insulated wires with a very thin sleeve to allow a tightly spaced coil. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.