NOKIA Providing your phone "a wireless charging pillow"



Nokia recently announced its latest smartphone  Lumia 920, which has wireless charging feature.
As the name implies, wireless charging is a cordless battery refill. No more cables need to be connected from the power source to the smartphone.
To recharge the battery, Lumia 920 users simply put the smartphone on a bearing charger . And the charger is of course still connected by cable to power source.
Nokia has collaborated with Fatboy to provide pads dock.

As the new Lumia 820 and Lumia 920 support Qi wireless charging, Nokia brings three new wireless charing accessories, the Fatboy Wireless Charging Pillow (DT-901), Wireless Charging Plate (DT-910) and the Wireless Charging Stand (DT-900). All of them support Qi wireless charging technology, meaning you can simply place your Lumia phone on them to start recharging.





Qi Technology :

The name "Qi" comes from the "qi" concept of energy flow from Chinese medicine, and is pronounced "chee." Qi works by generating an electromagnetic field between a charger and a device through magnetic induction. Qi chargers have a built-in transmitting coil that communicates with Qi devices using a specific electromagnetic frequency, so any Qi device will work with any Qi charger.



Under the Qi specification, "low power" for wireless transfer means a draw of 0 to 5 W. Systems that fall within the scope of this standard are those that use inductive coupling between two planar coils to transfer power from the power transmitter to the power receiver. The distance between the two coils is typically 5 mm. Regulation of the output voltage is provided by a digital control loop where the power receiver communicates with the power transmitter and requests more or less power. Communication is unidirectional from the power receiver to the power transmitter via backscatter modulation. In backscatter modulation, the power-receiver coil is loaded, changing the current draw at the power transmitter. These current changes are monitored and demodulated into the information required for the two devices to work together.

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