EPC offers AirFuel transmitter for simultaneous mobile device charging

To simultaneously and wirelessly power or charge mobile devices, from phones to laptops, Efficient Power Conversion (EPC) offers a class 4 transmitter, with a regulated category 5 AirFuel Alliance-compatible wireless power demonstration

kit capable of receiving up to 27W at 19V.

The EPC9129 class 4 wireless power kit can transmit up to 33W while operating at 6.78MHz (the lowest ISM band). The kit is supplied complete with two receivers, each with a regulated output, one capable of 5.0W and a second capable of delivering 27W at 19V.

The purpose of this demonstration kit is to simplify the evaluation process of using eGaN FETs for highly efficient wireless power transfer. The EPC9129 uses the high frequency switching capability of EPC’s GaN transistors to facilitate wireless power systems with full power efficiency between 80 and 90 per cent under various operating conditions, says EPC.

The EPC9129 wireless power system consists of four boards. There is the source board (transmitter or power amplifier) EPC9512 featuring the EPC8010, EPC2038 and EPC2019. This 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. It includes the gate driver(s), oscillator, and feedback controller for the pre-regulator to allow for compliance testing operating to the AirFuel class 4 standard over a wide load range.

There is a class 4 AirFuel-compliant source (transmit) coil and a category 5 AirFuel- compatible receive device, EPC9514 featuring the EPC2016C. Finally, there is the 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 a surface. End applications are varied and evolving quickly from phone charging to powering handheld tablets and laptop computers. Delivering up to 33W, the EPC9129 class 4 wireless power kit supports all of these applications.

The amplifier board is available separately as EPC9512 for evaluation in existing customer systems. The Category 5 EPC9514 and Category 3 EPC9513 (5 V, 5 W) device or receiving boards included in the wireless power demonstration kits are also available separately for engineers who have their own source boards or who want to work with multiple receiving devices simultaneously.