Powdered-iron-based receiver coil designed for 5 V wireless charging

July 13, 2012 // By Jean-Pierre Joosting
Vishay Intertechnology has announced a powdered-iron-based, WPC-compliant (Wireless Power Consortium) receiving coil for the wireless charging of 5 V portable electronics.

Offering a durable construction and high permeability shielding, the IWAS-3827EC-50 provides high efficiency greater than 70% for receiver applications to 10 W and is 33% smaller than the standard 48 mm by 32 mm IWAS-4832FF-50 receiver coil, with dimensions of 38 mm by 27 mm.

For wireless power base stations and receivers, the IWAS-3827EC-50's high-saturation powdered iron is not affected by permanent locating magnets, and the device shields sensitive components or batteries from charging flux. As an alternative to Ferrite-based solutions, which can saturate in the presence of a strong magnetic field, the IWAS-3827EC-50 offers a magnetic saturation of 50% at 4000 gauss.

The RoHS-compliant device features inductance of 10.7 µH at 200 kHz with a ±5% inductance tolerance, DCR of 183 mΩ at + 25 ºC, and Q of 30 typical at 200 kHz. The receiving coil features a lead length of 50 mm and tinned length of 10 mm.