Wireless power transfer

XXI century is the age of portable electronic devices. Smartphones, laptops and tablets have become an important part of human life. The processing power of the devices is continuously growing but mobility and autonomy requirements remain the same. The technology of wireless power transfer to charge mobile devices becomes very important.

Now the first versions of wireless charging terminals are available for customers. The terminals operational principle is based on the inductive coupling between the coils of the transmitter and receiver. However, the power transfer systems based on this method have several technical limitations.

First, an accurate mutual positioning is required to implement a reliable connection of the charging device with the charging terminal. Second, the efficiency of wireless power transfer systems is limited by Q-factor of the metal coils. In addition the efficiency is very sensitive to the distance between the receiver and transmitter. Third, these systems generally allow charging only one device. Therefore there is a need for convenient, safe and effective systems of charging mobile handheld devices, which can be achieved by using the magnetic resonance coupling.

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