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What is Wireless Charging and how it works


Wireless Charging in Smart Phones – Transmission of an electrical current from a base charger to a smart phone without physical contact

How wireless charging work ?

Wireless Charging is based on the principle of magnetic resonance or inductive power transfer (IPT) – the process whereby electricity is transferred between two objects through coils.

Energy is sent through an Inductive Coupling  to an electrical device, which can then use that energy to charge batteries or run the device.

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 electric current to charge the battery. The two induction coils in proximity combine to form an Electrical Transformer.

Resonant Wireless Charging

Greater distances between sender and receiver coils can be achieved when the inductive charging system uses Resonant Inductive Coupling.

Resonant inductive coupling or electrodynamic induction is the near field wireless transmission of Electrical Energy  between two magnetically coupled coils that are part of resonant circuits tuned to same frequency. This process occurs in a resonant transformer, an electrical component which consists of two high Q coils wound on the same core with capacitors connected across the windings to make two coupled LC Circuits.


  • Protected connections – No Corrosion, when the electronics are all enclosed, away from water or oxygen in the atmosphere.
  • 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.
  • Less E waste
  • Non radiative energy transfer
  • Reduced cost – No cost for connective parts




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Rakesh Bhatia

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