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Wireless charging ref design operates in lowest ISM band

Wireless charging ref design operates in lowest ISM band

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By Rich Pell



The EPC9129 kit comes complete with two receivers, each with a regulated output − one capable of 5 W capable and a second capable of delivering 27W at 19V. 

The design uses the high frequency switching capability of EPC gallium nitride transistors with full power efficiency between 80% and 90% under various operating conditions. This can charge mobile phones and notebook PCs simultaneously.

The EPC9129 wireless power system consists of four boards covering the different options for source and receiver functions.

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, and uses the EPC8010, EPC2038 and EPC2019 devices. 

The Category 5 EPC9514 (19 V, 27 W) and Category 3 EPC9513 (5 V, 5 W) receiving boards included in the wireless power demonstration kits are also available separately for designers that have their own source boards or who want to work with multiple receiving devices simultaneously. The efficiency of these first-generation systems is about 87% from input to the transmitter to the output of the receiver (end-to-end), and with future improvements in architecture and GaN IC technology this can reach into the 95% range says the company.

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 EPC9129 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 The EPC9513 and EPC9514 receive boards can also be purchased separately and are priced at $168.75 each.

All the boards are available from Digi-Key. 

 

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