How does contactless charging work?

Contactless charging, also known as wireless charging, is a method used to charge electronic devices without the need for physical cables or connectors. It uses electromagnetic fields to transfer energy between two objects: a charging pad or base station and the device being charged.

The process involves two primary components: a base station (or charging pad) and a compatible device. The charging pad, which is connected to a power source, contains a coil that generates an alternating electromagnetic field. This field creates an electric current in a receiving coil within the device being charged.

When the device is placed on the charging pad, the alternating electromagnetic field induces a voltage in the receiving coil. This voltage is then converted to direct current (DC) by a rectifier circuit within the device. The DC power is used to charge the device's battery. The process is controlled by a charging protocol that ensures efficient power transfer and prevents overcharging.

Contactless charging is usually based on one of two main wireless charging standards: Qi (pronounced "chee") or AirFuel, also known as the Wireless Power Consortium (WPC) and Power Matters Alliance (PMA) standards, respectively. These standards are used by various manufacturers and are compatible with a broad range of devices, such as smartphones, smartwatches, and even electric vehicles (EVs).

Overall, contactless charging simplifies the charging process by eliminating the need for physical connections, providing convenience and reducing clutter. It allows for easy and seamless charging of electronic devices by simply placing them on a charging pad or surface.