Practically everyone owning a mobile knows that it is important to recharge the battery of the mobile every now and then. Many a times, you may have in fact been jolted from sleep because of the beeping of a weak mobile phone battery. Charging mobile phones may prove to be a hassle to many people with the cables that have to be carried wherever you go, and having to remember to charge the mobile on time.
Forget plugging your charger to a socket. Scientists at the Massachusetts Institute of Technology (MIT) have developed remote charging using magnetic induction between two devices that resonate with one another. Objects that resonate on the same frequency send energy from each other, a phenomenon called “strong coupling.”
Inductive charging uses the electromagnetic field to transfer energy between two objects. A charging station sends energy through inductive coupling to an electrical device, which stores the energy in the batteries. Because there is a small gap between the two coils, inductive charging is one kind of short-distance wireless energy transfer.
The other kind of charging, direct wired contact (also known as conductive charging or direct coupling) requires direct electrical contact between the batteries and the charger. Conductive charging is achieved by connecting a device to a power source with plug-in wires, such as a docking station, or by moving batteries from a device to charger.
Induction chargers typically use an induction coil to create an alternating electromagnetic field from within a charging base station, and a second induction coil in the portable device takes power from the electromagnetic field and converts it back into electrical current to charge the battery. The two induction coils in proximity combine to form an electrical transformer.
Greater distances can be achieved when the inductive charging system uses resonant inductive coupling.
Source:Wikipedia
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