This article is an overview of the elements needed to assemble a wireless power transfer system. The EPC9104 demonstration system from EPC showcases the high frequency, voltage, and power required for efficient wireless power transfer.

EDN Europe
March 2013
http://mag.electronics-eetimes.com/EDNE_MARCH_2013/#/26/

Wireless charging will be a fast-growing segment of the power electronics industry in 2013. Significant developments began accelerating last year. The “Top 10” developments selected by the PowerPulse editors highlight important trends in wireless charging that will continue in 2013 and beyond.

EPC announced a high efficiency wireless power demonstration system utilizing the high frequency switching capability of gallium nitride transistors. eGaN® FETs from EPC are well suited for these systems because of their ability to operate efficiently at high frequency, voltage, and power. This 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 purpose of this demonstration system is to simplify the evaluation process of the wireless power technology. 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.

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January 2, 2013

In this article we show that enhancement mode GaN transistors enable significant efficiency improvements in resonant topologies and demonstrate a practical example of a wireless power transmission system operating in the 6.78 MHz range.

By Alex Lidow PhD, CEO; Michael deRooij PhD, Executive Director of Application Engineering; David Reusch PhD, Director of Application Engineering, EPC Bodo’s Power Systems (www.bodospower.com)

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Superior switching speeds of EPC’s eGaN FETs increases the efficiency of power electronics for highly resonant wireless power transfer.

EL SEGUNDO, Calif.—August 13, 2012 — Efficient Power Conversion Corporation (EPC) today announced a high efficiency wireless power demonstration system utilizing the high frequency switching capability of gallium nitride transistors. eGaN FETs from EPC are an ideal solution for these systems because of their ability to operate efficiently at high frequency, voltage, and power.

Wireless power applications are gaining popularity in many commodity products such as mobile phones chargers. Enhancement mode gallium nitride transistors offer an alternative to MOSFET technology as they can switch fast enough to be ideal for wireless power applications. This article focuses on experimental evaluation of an induction coil wireless energy system using eGaN FETs operating at 6.78 MHz designed to be suitable for multiple 5 W USB based charging loads.

By Johan Strydom, Ph.D., Vice President of Applications, EPC and Johan Strydom, Ph.D., Vice President of Applications, EPC
Power Electronics Technology

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