Superior characteristics of eGaN® FETs and integrated circuits, such as low output capacitance, low input capacitance, low parasitic inductances, and small size make them ideal for increasing efficiency in highly resonant, AirFuel™ wireless power transfer systems.
EL SEGUNDO, Calif.— May 2018 — Efficient Power Conversion Corporation (EPC) today announces the availability of a complete class 4 wireless power kit, the EPC9129. The system can transmit up to 33 W while operating at 6.78 MHz (the lowest ISM band). The kit comes complete with two receivers, each with a regulated output − one capable of 5 W capable and a second capable of delivering 27 W at 19 V.
The purpose of this demonstration kit is to simplify the evaluation process of using eGaN FETs for highly efficient wireless power transfer. The EPC9129 utilizes the high frequency switching capability of EPC gallium-nitride transistors to facilitate wireless power systems with full power efficiency between 80% and 90% under various operating conditions.
The EPC9129 wireless power system consists of four boards:
- Source Board (Transmitter or Power Amplifier) EPC9512 featuring the EPC8010, EPC2038 and EPC2019
- Class 4 Air Fuel compliant Source Coil (Transmit Coil)
- Category 5 AirFuel compatible Receive Device EPC9514 featuring the EPC2016C
- Category 3 AirFuel compatible Receive Device EPC9513 featuring the EPC2019
The popularity of highly resonant wireless power transfer is increasing rapidly, particularly for applications targeting large power transmitting surface areas, with the capability to place receiving devices anywhere on the surface, and the ability to simultaneously power (or charge) multiple devices placed on the surface. The end applications are varied and evolving quickly from cell phone charging to powering handheld tablets and laptop computers. Delivering up to 33 W supports all of these applications.
Source (Amplifier) Board
The source board is a highly efficient 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.
The amplifier board is available separately as EPC9512 for evaluation in existing customer systems.
Device (Receiving) Boards
The Category 5 EPC9514 (19 V, 27 W) and C