AC enters the charger
AC power enters the charger through a removable AC plug. A big advantage of switching power supplies is they can be designed to run on a wide range of input voltages. By simply swapping the plug, the charger can be used in any region of the world, from European 240 volts at 50 Hertz to North American 120 volts at 60 Hz. The filter capacitors and inductors in the input stage prevent interference from exiting the charger through the power lines. The bridge rectifier contains four diodes, which convert the AC power into DC