GaN increases the efficiency of wireless charging

Published:2012/8/14 22:48:00 Author:Ecco From:SeekIC

According to Efficient Power Conversion Corp., wireless charging startup WiTricity Corp. has demonstrated wireless charging using gallium nitride FETs.

Established in 2007, Efficient Power Conversion Corp. is a 2007 gallium nitride power transistor startup. The company said that GaN transistors are superior for the proposed 6.78-MHz carrier frequency for resonant transfer. And the switching speed of EPC’s eGAN FETs increases the efficiency of resonant wireless power transfer compared to silicon MOSFETs.

Many wireless charging products now in the market use traditional magnetic induction coils with operating frequencies between 100-300 kHz, and Class E, F and S amplifier converter topologies. The wireless power demonstration system jointly developed by EPC and WiTricity is a class-D power system operating at 6.78 MHz, and capable of delivering up to 15 W to a load. The system includes all the critical components in a single system that can be easily connected to demonstrate the powering of a device with wireless energy transfer. The system is developed to simplify the evaluation process of the wireless power technology.

The resonant aspect of WiTricity’s technology means it is capable of transferring power at distance enabling a wide range of consumer, medical, industrial and automotive applications.

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