Eggtronic Engineering S.p.A. has launched a high-performance 30-W wireless charger evaluation board to help speed the prototyping and development of ultra-high-efficiency, low-component-count wireless power transfer applications. It can be used in a variety of applications, including electric bikes, scooters, home appliances, industrial tools, drones and domestic robots.
The eval board is based on a reference design that uses the Eggtronic power integrated controller (EPIC ) IC with a proprietary conversion architecture. It enables engineers to create applications that provide efficiency levels comparable to conventional wired AC/DC power supplies, the company said.
The wireless charger board features a continuous 30-W output power with direct AC input, eliminating the need for external adapters. It supports CC/CV battery charging and achieves overall efficiency exceeding 82% (from the AC input on the transmitter side to the DC output on the receiver side) and above 91% DC-to-DC / coil-to-coil efficiency at 30 W.
(Source: Eggtronic Engineering S.p.A.)
Eggtronic said this performance surpasses existing wireless power solutions and is in line with traditional corded AC/DC adapters, while offering a much lower bill of materials (BOM). In addition, performance can be further improved, exceeding other wireless power solutions and the majority of existing corded AC/DC adapters, according to the company, by using Eggtronic’s options for maximum performance, such as GaN FETs and semi-active input bridge rectifier architectures.
The board is built around Eggtronic’s EPIC IC technology. Incorporated into both the transmitter and receiver sides of the design, the mixed-signal, low-power controller with a 32-bit RISC-V core and a variety of analog and digital peripherals enables multi-mode operation and facilitates the integration of multiple functions, Eggtronic said. It also comes with several advanced safety features, including foreign object detection, over-power protection, over-voltage protection, overcurrent protection, over-temperature protection, short circuit protection and brown-out protection.
This integration reduces the BOM by minimizing the number of ICs needed, simplifying product development and reducing overall costs.
Unique to Eggtronic, the EPIC IC can manage AC/DC conversion on the transmitter side and oversee receiver-side functions such as battery charging. This streamlined architecture enhances efficiency and improves reliability by minimizing energy losses through zero voltage switching-zero current switching (ZVS-ZCS) under various load conditions thanks to proprietary firmware control algorithms, the company said.
The new board is based on a series-resonance wireless power transfer, which can be compatible with the Qi standard. When Qi compatibility is not required and higher power transfer is required, designers can use Eggtronic’s E2WATT proprietary architecture, which integrates AC/DC and DC/AC stages into a single efficient solution, offering 92% efficiency and up to 300 W.
“E2WATT delivers all the benefits of wireless power transmission with performance comparable to top-tier wired AC adapters, while reducing both active and passive component counts by 50%,” Eggtronic said.
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