Industrial Electronics

Video: The promise of wireless charging approaches

23 February 2021

Multinational electronics company Xiaomi announced the development of a new power transmission system that can charge a cellphone from across a room without any wires or charging pads. Mi Air Charge Technology reportedly delivers 5 W power to multiple devices within a radius of several meters, potentially enabling users to ditch the wires and cables currently needed to reboot personal electronics.

The charging base is composed of an array of 144 antennas that utilize beamforming to send millimeter-wide Source: XiaomiSource: Xiaomiwaves directly to a cellphone or other device. Beamforming creates wireless signals that are directed to a specific device to achieve a faster, more reliable and more direct connection. Traditional wireless signals disperse waves to reach multiple devices over a wide area.

Devices such as smartphones capture the waves and convert them into power. Beacon antennas on the devices to be charged emit low-power signals allowing the charging station to pinpoint their location. A 14-antenna receiving array captures and and converts the millimeter wave signal emitted by the charging pile into electric energy through a rectifier circuit, enabling multiple devices to be charged simultaneously.

As the company is still fine-tuning the system, the wireless charging system is not yet available to consumers.

To contact the author of this article, email shimmelstein@globalspec.com


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