What is Qi Wireless Charging?
Qi, pronounced “chee”, comes from the Chinese symbol meaning energy flow.
The short explanation is that it uses magnetism to transmit energy. The current coming from the wall power outlet moves through the wire in the wireless charger, creating a magnetic field. The magnetic field creates a current in the coil inside the device. This coil is connected to the battery and the current charges the battery. Wireless charging is more accurately described as “inductive charging” because it uses magnetic induction.
The idea behind Qi is simple: all devices with the Qi logo will work with all Qi chargers. That’s it. No need for separate chargers, no need for cables, and no need for adapters when traveling. Qi is a global standard – this means that your device can be charged wirelessly wherever you go!
The Qi standard also incorporates a limited communication protocol in addition to power transfer. With this, the receiving device can tell the charger how much power it requires, and when it is fully charged. With this control information, the charger can adapt its output to suit any device and shut itself down when the receiving device is fully charged.
The real trick to performing a wireless power transfer is known as inductive coupling. Whereby an electrical current is applied to a wire coil, and the resulting magnetic field is passed through an adjacent secondary coil, in which a current is then induced. If that secondary coil is then connected to a battery charging circuit, we have an – albeit crude – wireless charging device.
Qi is the proven leader in wireless charging. Qi has unrivaled reach, delivers the best user experience, and is moving the fastest to bring new wireless charging innovations to market.