Qi is one of the most commonly used standard for wireless charging in the current market. The principle behind Qi is to allow Qi-Enabled devices to work with all Qi chargers. No need for separate chargers, cables, adapters when traveling. Wireless charging, also known as inductive charging, is based on a few simple principles. The technology requires two coils: a transmitter and a receiver. An alternating current is passed through the transmitter coil, generating a magnetic field. This in turn induces a voltage in the receiver coil; this can be used to power a mobile device or charge a battery.