To fully understand how wireless charging works takes
understanding the concept of an electromagnetic field and
electromagnetic induction. Electromagnetic induction is an
energy transfer system, meaning that it can be stored or used.
Think of a person
making waves with the rope, the other person will receive the
waves as they travel down the rope. This is like electromagnetic
induction: a force sends energy from one point to another. The
base unit (powered by electricity) transmits energy to the
smartphone via electromagnetic fields. The sensors on the
smartphone recover the energy and channel it to the battery for
storage.
Qi is the most popular
wireless charging technology. It is not restricted to a
particular manufacturer. Qi uses electromagnetic induction
charging and magnetic resonance technology.