The USB charger is now an object of the most common thing used, specially on Apple mobile devices. A plug on one side, a USB connector on the other and the voltage drops to 110/220 volts at 5/10 volts required for all mobile devices.
Like most manufacturers, Apple has designed its own USB chargers. From the outside this block of white plastic seems rather insignificant. Inside is another story as was discovered by Ken Shirrif by opening a charger. His section is (very) long and (very) technical, but it appears that the manufacturer of Cupertino has worked particularly object apparently so trivial.
The USB output also has specific resistances connected to the data pins to indicate to the iPhone how much current the charger can supply, through a proprietary Apple protocol. An iPhone displays the message “Charging is not supported with this accessory” if the charger has the wrong resistances here.
The AC adapter / USB Apple had done a very simple voltage conversion, but it does so in surprising ways. The conversion process is described as innovative and complex at once. The details will interest only the most savvy readers of electronics, but it is fascinating that all the apple products have a radical sense of detail.
This analysis also calls for a conclusion very convenient. sold roughly for $30 , Apple USB charger is much more expensive than other equivalent products on the paper. Still, the manufacturer has chosen quality components and a unique design that guarantees the safety of the terminal to load, but also limits interference with components of iOS devices.
A low-end loader and unbranded also handle the battery of your iPhone, but you will not be immune to a problem if the electricity is poor or unstable. Between a shipper to $30 and a mobile device that exceeds $500, the most reasonable choice seems obvious .
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