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Energous wireless charging technology enables mobile charging within 4.7 meters
Wireless charging technology has taken another major leap forward. Energous, a startup in the field, has introduced a new method that differs from traditional magnetic resonance systems. Instead of using electromagnetic fields, their technology sends radio waves to charge devices, and claims to support charging even when the device is moving within a 15-foot (4.7-meter) range.
According to ExtremeTech, Energous' system can deliver up to 10 watts of power over that distance and has the capability to track the location of the device in real time. The company plans to launch its products in the U.S. in January 2015, and will be showcasing them at the Consumer Electronics Show (CES) alongside various partners.
Currently, most wireless charging solutions rely on magnetic resonance technology, such as Rezence, developed by WiTricity—a company spun off from MIT. This method uses resonant frequencies between the charging pad and the device to transfer energy efficiently through the air.
However, Energous' approach is different. It reportedly uses an array of small antennas to send radio waves to Bluetooth-recognized devices. Although the company hasn’t revealed all the details, ExtremeTech suggests that beamforming technology may be involved, allowing precise targeting of electromagnetic signals to the device.
The Energous transmitter, called EnergyRouter, can charge two sets of devices simultaneously and follow them as they move within the 4.7-meter range. It has an efficiency of about 20%, which is relatively low compared to other methods, but still promising for certain applications.
To use this technology, devices must have an antenna cover installed. These covers will be showcased alongside EnergyRouters at CES 2015. Looking ahead, Energous plans to integrate the charging technology directly into devices, starting with receiver and transmitter chips.
While companies like WiTricity have already gained support from big names like Intel and Qualcomm, Energous is taking a different path by avoiding magnetic resonance. Critics argue that magnetic resonance has limitations due to physical constraints, making it less ideal for widespread adoption. Beamforming, on the other hand, offers more flexibility and could enable wireless charging for most devices in a given space.
Whether Energous or Rezence becomes the dominant standard remains to be seen. However, one thing is clear: wireless charging is getting closer to becoming a seamless part of daily life. Soon, users will be able to charge their phones anywhere, and the technology could also power smart homes and large sensor networks.