EPC's EPC9121 is a high-efficiency, power demonstration system, capable of operating to multiple wireless power standards. It is compatible with the Qi standard of the Wireless Power Consortium (WPC), the Power Matters Alliance (PMA) standard (now merged with AirFuel™ Alliance), and AirFuel (formerly A4WP) wireless power standards. In AirFuel resonant mode, hence referred to as AirFuel 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. In Qi/PMA 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 device. The purpose of the EPC9121 is to simplify the evaluation process of both resonant and inductive wireless power technologies using eGaN FETs and eGaN ICs.

The amplifier is configured for single-ended operation and includes the gate driver(s), oscillators, and feedback controller for the pre-regulator, which ensures operation for wireless power control based on the AirFuel standard. This configuration allows for testing compliant to the AirFuel Class 2 standard over a load range as high as ±35j Ω. The pre-regulator features the 100 V rated 65 mΩ EPC2036 as the main switching device for a SEPIC converter.

The EPC9121 is provided with two receive device units: The first is tuned to and compatible with the AirFuel Category 3 specification and the second is an inductive mode unit compatible with the 5 W Qi receiver standard. Each of the device units includes a high frequency Schottky diode based full bridge rectifier and output filter to deliver a filtered unregulated DC voltage. The device board comes equipped with two LED’s, one green to indicate the power is being received with an output voltage equal or greater than 4 V and a second red LED that indicates an overvoltage condition where the output voltage exceeds 36 V.