Xiaomi just announced its own remote wireless charging system: Mi Air Charge. In other words, neither cables nor a charging base is necessary, but rather the charging process happens remotely, at a distance of “several meters”, and with a power of 5W, according to the company.
Furthermore, Xiaomi claims that its technology is capable of charging multiple devices at the same time with a power of 5W and that “even physical obstacles do not reduce the effectiveness of the load.” It is true that it is not too high a speed, but it is a small big step forward. The company has not confirmed that it is going to implement this technology on a mobile phone soon, but it has given details of its operation.
Xiaomi explains that the core of this technology is based on spatial positioning and energy transmission. The charging station developed by the brand has five phase interference antennas that “can accurately detect the location of the smartphone.” Once its location has been detected, a series of 144 antennas transmit millimeter waves to the phone through beam formation.
This is useless if the smartphone does not have a receiving system, of course. Therefore Xiaomi has developed a “set of miniaturized antennas” with a beacon antenna and a series of 14 built-in receiving antennas. The former transmits position information “with low power consumption”. The latter convert the millimeter wave signal into electrical energy through a rectifier circuit.
Basically Xiaomi converts millimeter waves into electrical energy. According to Xiaomi, its technology is currently capable of remotely charging several devices at the same time with a power of five watts in a radius of five meters. It is not the fastest loading speed in the world, but it is a most interesting figure for such an incipient technology.
Although Mi Air Charge makes a lot of sense on mobile phones, since it could be able to charge the phone if we leave it on the table, for example, the Chinese company explains that can work with smart watches, bracelets and other wearables. Indeed, Xiaomi envisions a future in which all speakers, desk lamps and other small IoT devices work without cables. However, it should be remembered that for the moment this technology is a promise and not a commercial product, so it is better to wait for the company to launch it, if it ever does.
Motorola also shows its teeth
Xiaomi is not the only manufacturer that has shown its remote wireless charging technology. Motorola has also shared a video on Weibo in which it shows its technology. From what we have been able to see, the system is less complex than Xiaomi.
This consists of a kind of charging device that is placed on the table. To make it work, the mobile has to be in a straight line with respect to the charger, that is, right in front, and at a distance of no more than one meter.
It seems like it can be used with multiple devices at the same time, but Motorola has not disclosed the charging speed. In addition, unlike what Xiaomi promises, for Motorola technology it seems that obstacles are a problem, since when you put your hand between the charging base and the mobile the charging process stops.