Multi-Device Wireless Charging Development Environment

October 27, 2017 by Paul Shepard

Würth Elektronik eiSos  announced its collaboration with Semtech Corporation by integrating its transmission coil, WE-WPCC, with Semtech’s LinkCharge® LP (low power) platform, an innovative wireless charging solution that concurrently charges multiple, low-power devices using a single transmitter.

The WE-WPCC series transmission coil excels with its NiZn ferrite shielding to protect sensitive electronics and concentrate the magnetic field. The coil is specially designed for resonant inductive coupling and allows several receivers to be used at the same time.

Semtech’s LinkCharge LP (TSWITX-5V-2RX-EVM), featuring Würth’s transmission coil, provides positioning and spatial freedom that allows for charging of multiple devices.

The platform delivers one-Watt of output power to charging devices and specifically targets low-power applications including hearing aids, activity trackers, smart headphones, smart jewelry and clothing, low power industrial, portable medical equipment, and LED fixtures.

TSWITX-5V-2RX-EVM Evaluation Module schematic (click on schematic to enlarge)

The TSWITX-5V-2RX-EVM Evaluation Module is a ready-to-use demonstration platform allowing testing of approximately 1 watt of wireless power transmission. The system operates at a 1MHz frequency.

The transmitter when coupled with its compatible receiver modules, the Semtech TSWIRX-5V2-EVM, will form a complete wireless power transmission system. TSWITX-5V-2RX-EVM can take 2 TSWIRX-5V2-EVMs at once. Both RX can output up to 100mA max at the same time.

Those who wish to develop their own board, or integrate this functionality into an existing system can use the EVM as a starting point for their design, as it demonstrates a working model from which to proceed. All documentation for the EVM is provided to make the process as efficient as possible.

The key technologies in the EVM are the Semtech TS80002 and TS61005 high efficiency integrated circuits. The TS80002 controls the system and implements the wireless power transfer protocols, while the TS61005 is the MOSFET driver that powers the transmitter antenna.

The windings of the WE-WPCC coil consist of high frequency stranded wire with high permeability shielding. The coil also scores a far lower resistance and higher Q factor than all those comparable products previously on the market. WE-WPCC 760 308 102 308 for resonance solutions is available from stock, with a design kit and free sample service likewise.

“The Semtech LinkCharge LP wireless charger represents exemplary use of our high-grade coils and we are pleased about this important reference,” explains Jörg Hantschel, Business Development Manager Wireless Power at Würth Elektronik eiSos. “The coil used in LinkCharge LP is also suitable beyond the Qi standards, which primarily focus on consumer electronics.”

"Semtech's LinkCharge LP platform was designed to enhance the overall user experience by allowing people to charge multiple devices at once without the hassle of cables," said Ruwanga Dassanayake, Power Management Product Line Manager for Semtech's Power and High-Reliability Products Group. "Würth Elektronik's WE-WPCC transmission coil is a key component of LinkCharge LP and makes it possible for our solution to give our customers a unique experience.”