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Consumer Electronics

Kit Simplifies Design of Multi-Mode Wireless Power-Charging System

26 July 2016

To simplify the task of evaluating enhancement-mode gallium nitride (eGaN)-based power FETs, or eGaN FETs, for multi-mode wireless power-charging systems, Efficient Power Conversion (EPC) has unveiled a complete demonstration kit compatible with the two major wireless power- charging standards. This kit, labeled EPC9121, supports both the AirFuel Alliance Class 2 based on the magnetic resonant technology, and the Wireless Power Consortium Qi (A6) built around inductive coupling technology. In essence, it includes a source or a transmitter board that powers a receiver built using either standard.

Multi-mode transmit coil supports both the AirFuel Class 2 and Qi-A6 wireless power-charging standards. (Image Credit: EPC)   Multi-mode transmit coil supports both the AirFuel Class 2 and Qi-A6 wireless power-charging standards. (Image Credit: EPC)

In the AirFuel resonant mode, the EPC9121 system operates at 6.78 MHz with the amplifier circuit configured for ZVS operation. In this mode, the system can deliver up to 10 W of power into the source coil. Likewise, in Qi (A6) inductive mode, the system operates at 165 kHz with the amplifier circuit configured for hard-switching operation and can deliver up to 5 W of load power into the transmit coil. In short, the kit contains all the passive and active components, including 100 V eGaN FETs and coils, needed to build and evaluate the multi-mode wireless power-charging system.

Precisely, the EPC9121 demonstration kit comprises four components. These include a source (transmitter) board EPC9511, multi-mode source (transmit) coil, AirFuel Class 2 compatible receive coil with rectifier and DC output, and Qi-compatible receive coil with rectifier and DC output. Assembly details, including schematic and other operational and measurement procedures, are provided in the development board’s quick-start guide. Priced at $907.20, the multi-mode demonstration kit is available from Digi-Key.



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