The mainstream of the wireless charging technology in the market is mainly through three ways:electromagnetic induction, radio wave, and resonance, and Qi adopts the most mainstream electromagnetic induction technology. Qi is the first organization to promote wireless charging technology, the wireless charging Alliance (Wireless Power Consortium (WPC)), which has two characteristics of convenience and generality. First, products with different brands can be charged with Qi wireless charger as long as they have a Qi logo. Second, it solve the "versatility" of wireless charging. In the near future, mobile phones, cameras, computers and other products can be charged with Qi wireless charger, providing the possibility of large-scale applications of wireless charging.