Qi is the Wireless Power Consortium, which is the first standardization organization for Wireless charging technology in the world. Firstly, products of different brands can be charged with Qi wireless charger as long as they have a Qi logo. Secondly, it overcomes the technical bottleneck of wireless charging "generality". In the near future, mobile phones, cameras, computers and other products can be charged with Qi wireless charger, providing the possibility for large-scale application of wireless charger.

Qi is based on electromagnetic induction. The basic principle of inductively coupled power transmission system is shown in the figure on the right. The system consists of transmitter coil L1 and receiver coil L2, which together form an electromagnetic coupling sensor. The alternating current carried by the transmitter coil generates a magnetic field and, through induction, generates a voltage in the receiver coil. This voltage can be used to power mobile devices or charge batteries.