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NewSpace demands low voltage, high current power for performance and longevity - Nov 2022
Matt Renola, Senior Director, Global Business Development – Aerospace & Defense
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Power Electronics Europe News
Demonstration kit prepares for wireless charging

Capable of transmitting up to 33W, the EPC9120, is a complete class 4 wireless power charging kit, from Efficient Power Conversion (EPC). The company says that the superior characteristics of eGaN FETs, such as low output capacitance, low input capacitance, low parasitic inductances, and their small size, make them suitable for increasing efficiency in resonant, AirFuel wireless power transfer systems.

The wireless power charging kit can transmit up to 33W while operating at 6.78MHz (the lowest industrial, scientific, medical (ISM) band). The kit is intended to simplify the evaluation process of using eGaN FETs for efficient wireless power transfer.  The EPC9120 uses the high frequency switching capability of EPC gallium nitride (GaN) transistors to facilitate wireless power systems with full power efficiency between 80 and 90% under various operating conditions.

The EPC9120 wireless power system consists of four boards - the source board (transmitter or power amplifier) EPC9512, the Class 4 AirFuel-compliant source or transmit coil, the Category 4 AirFuel-compliant device coil with rectifier and DC smoothing capacitor, and the Category 3 AirFuel-compliant device coil with rectifier and DC smoothing capacitor.

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. This amplifier board is available separately, as the EPC9512, for evaluation in existing customer systems. The source and device coils are AirFuel-compliant and have been pre-tuned to operate at 6.78MHz. The source coil is class 4 and the device coils are category 3- and category 4-compliant.  

The popularity of highly resonant wireless power transfer is increasing, says the company, particularly for applications targeting portable device charging. End applications are evolving quickly from cell phone charging, to handheld tablets, and laptop computers. 

The EPC9120 wireless power transfer demonstration system is available now; the EPC9512 amplifier board can be purchased separately. Both are available for immediate delivery from distributor, Digi-Key.


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