How Does Wireless Charging Work?

02-02-2023

Wireless charging works by using electromagnetic induction to transfer energy between two devices. The technology is based on the principle that an electrical current flowing through a wire generates a magnetic field around the wire. When this magnetic field is brought close to another wire, an electrical current is induced in that wire.

In wireless charging, one device, called the charging pad or base, contains a coil that generates an alternating magnetic field. Another device, such as a smartphone or tablet, contains a second coil that acts as the receiver. When the two coils are brought close together, the alternating magnetic field induces an electrical current in the receiver coil, which is then used to charge the device's battery.

The charging pad can be plugged into a power outlet, and the device is placed on top of the pad or in close proximity to it. The charging pad uses a technology called resonant inductive coupling, which allows for the charging to occur over a small air gap between the charging pad and the device.

Some wireless charging systems use a technique called near-field magnetic resonance (NFMR) which allows for charging at a greater distance between the device and the charging pad.

It's worth noting that not all devices are compatible with wireless charging, and some devices require a special case or attachment to enable wireless charging. Additionally, wireless charging is typically slower than wired charging and the charging efficiency can be affected by the distance and alignment between the charging pad and the device.