The other day I decided to get one of these USB wall adapters from a reputable brand (
Leviton T5632) and take a look inside its guts before installing it.
I was glad to see the quality and the build were very reasonable for its price (US$24.00 in the local store).
Faceplate
Another shot of the faceplate
Back cover with vents
Faceplate removed with the ground terminal
Ground terminal removed
Removed the back cover
Another angle with the view of the main board
Main board with the suppressing capacitor between primary and secondary. Shown are the beefy diodes, the suppressor capacitor, the MOSFET (FDD5N50?), the poly fuse and the tiny SOT flyback controller (UCC28700). I am not crazy about the solder joints that connect to the USB connector daughtercard (close to C2)
Input MOV, poly fuse and common mode choke
Filter inductor, main cap (Capxon, but at least it is 105C), flyback transformer and DC filter caps (not sure about their brand)
Another view with filter caps, flyback transformer, main cap and inductor filter
Detail about the press wire contact
Wire terminals and the PCB edge of the low-voltage USB. I did not disassembly the unit entirely, but it can be seen some SOT devices that are probably the voltage regulator.
Detail of the USB connector and the insulation between the AC and DC sides
Another shot at the insulation between the AC and DC sides