It is easy to know that the Apple Chargers is very useful and necessary for your Iphone. And it uses a fly back switching power supply Justin Tucker Ravens Jersey , like most USB chargers. Simply put, it takes AC input and produces five watts of smooth 5-volt power with a "surprisingly complex and innovative" circuit designed to produce carefully-filtered and smooth power, to prevent any dirty power interference with the touch screen when plugged in. Apple chargers are of exceptionally high quality, says Sherriff, and given the cost of the components, there’s no reason why more chargers shouldn’t be built this way. The important difference between Apple Chargers and others is attention to detail.