Wireless charging (also known as "Inductive charging") uses a electromagnetic field to transfer energy between two objects. It is done by a charging station which sends energy through inductive coupling to an electronic device, which can use that energy to charge battery or run the device.
Wireless chargers usually use an induction coil to create an alternating electromagnetic field from a charging base.
Second induction coil is present in the portable device which takes the power from the electromagnetic field and converts it back into electric current to charge the battery.
Advantages
· Protected connections – no corrosion when the electronics are all enclosed, away from water or oxygen in the atmosphere.
· Safer for medical implants – for embedded medical devices, allows recharging/powering through the skin rather than having wires penetrate the skin, which would increase the risk of infection.
· Durability – Without the need to constantly plug and unplug the device, there is significantly less wear and tear on the socket of the device and the attaching cable.
· Can be more convenient - no need for cables.
Disadvantage
· Lower efficiency, waste heat – The main disadvantages of inductive charging are its lower efficiency and increased resistive heating in comparison to direct contact. Implementations using lower frequencies or older drive technologies charge more slowly and generate heat within most portable electronics.
· Slower charging – due to the lower efficiency, devices can take longer to charge when supplied power is the same amount.
· More expensive – Inductive charging also requires drive electronics and coils in both device and charger, increasing the complexity and cost of manufacturing.
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