In the field of mobile phones, Palm launched the Touchstone wireless charger in 2009. Since then, we have found a series of wireless charging back cover + charging pads. However, there is one common problem with mainstream products on the market---you can only charge a device while it is extremely harsh to locate the device.
In addition, it’s hard to form a universal standard because of competition. According to market research by IHS company ,the wireless charging market has reached 216 million US dollars in 2013, and it will reach 815 million USD in 2018. Many manufacturers want to establish their own standards, so as to enjoy greater share of this potential market.