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RF wireless charging tech reduces sensitivity of wearables

13 Dec 2013  | Julien Happich

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With its ThunderLink circuitry, the company is able to precisely tune the RF frequency in the cavity to create narrow hot spots and focus the RF power onto the receiving antennas of the devices to be recharged. The RF signal picked up by the antennas is then rectified to the appropriate DC currents for charging each of the devices' batteries. The Nest allows multiple devices to charge simultaneously, while constantly monitoring and adjusting the charging process for ultimate compliance with the device's power requirements.

By confining the charging procedure to a box, Humavox claims to achieve a wireless power transfer efficiency of 90 per cent, from the enclosure to the device to be recharged. The company also stays clear of regulations on transmitted RF power in free space, with no limitations on power output, so the Nest could charge anything from tiny hearing aids to smart watches, wearable fitness or health monitoring devices or even more power hungry mobile phones and tablets.

The key benefit again is that the devices can be stored in any order and orientation into the Nest, which itself could take any shape.

The Nest station was intentionally crafted to be a design-free solution, hence it has no predefined industrial design. To illustrate this, Lachman mentioned an interesting automotive application, where difficult to access sensors had to be powered remotely, in the car engine. Humavox was able to use the engine block as the Nest station and tune the transmitted RF power to precisely address the sensor's need, in the 200MHz to 400MHz range.

The company is not planning to sell chips, but will license its technology as IP for others to integrate, alongside other charging technologies. It is already working with OEMs and expects Eterna-enabled products to reach market by 2015.


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