Inductive charging

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Inductive charging, also known as wireless charging or cordless charging, is a type of wireless power transfer. It uses electromagnetic induction to provide electricity to portable devices. Inductive charging is also used in vehicles, power tools, electric toothbrushes, and medical devices. The equipment can be placed over an inductive pad free of any electrical contacts such as a dock or plug. Inductive charging transfers energy through inductive coupling: alternating current passes through an induction coil, generating a fluctuating magnetic field, which creates an induced alternating electric current in a nearby secondary coil. The alternating current can be rectified to a direct current which charges a battery or provides operating power. Greater distances between sender and receiver coils, such as those required for wirelessly charging electric vehicles, can be achieved with resonant inductive coupling. The alternating current of the system can use a resonance frequency tuned with...

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