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EPC Introduces Wireless Charging Demo Kit

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GaN-fet-based AirFuel class 4 wireless power charging kit can transmit up to 33W at 6.78MHz

Efficient Power Conversion Corporation (EPC) has announced the availability of a complete class 4 wireless power charging kit, the EPC9120. The system can transmit up to 33 W while operating at 6.78 MHz (the lowest ISM band).

The purpose of this demonstration kit is to simplify the evaluation process of using eGaN FETs for highly efficient wireless power transfer. The EPC9120 uses the high frequency switching capability of EPC GaN transistors to facilitate wireless power systems with full power efficiency between 80 percent and 90 percent under various operating conditions.


The EPC9120 wireless power system consists of four boards: Source Board (Transmitter or Power Amplifier); EPC9512 Class 4 Air Fuel compliant Source Coil (Transmit Coil); Category 4 AirFuel compliant Device Coil with rectifier and DC smoothing capacitor; and Category 3 AirFuel compliant Device Coil with rectifier and DC smoothing capacitor.

The popularity of highly resonant wireless power transfer is increasing rapidly, particularly for applications targeting portable device charging. The end applications are varied and evolving quickly from cell phone charging, to handheld tablets, and laptop computers. Delivering up to 33 W supports all of these applications.

Source (Amplifier) Board

The source board is a Zero Voltage Switching (ZVS), Class-D amplifier configured in an optional half-bridge topology (for single-ended configuration) or default full-bridge topology (for differential configuration), and includes the gate driver(s), oscillator, and feedback controller for the pre-regulator. This allows for compliance testing operating to the AirFuel class 4 standard over a wide load range. This amplifier board is available separately as EPC9512 for evaluation in existing customer systems.

Source (Transmit) and Device (Receiving) Coils

The source coil, as well as the device coil, are AirFuel compliant and have been pre-tuned to operate at 6.78 MHz. The source coil is class 4 and the device coils are category 3 and category 4 compliant.

The EPC9120 wireless power transfer demonstration systems are priced at $907.20 each. The EPC9512 amplifier board can also be purchased separately and is priced at $390.00 each.



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