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Vishay Intertechnology introduces new Rx coil for 5 V wireless charging circuitry

Posted: 16 Jul 2012 ?? ?Print Version ?Bookmark and Share

Keywords:receiving coil? 5 V portable electronics? permanent locating magnets? wireless charging?

Vishay Intertechnology Inc. has developed a new powdered-iron-based, WPC-compliant (Wireless Power Consortium) receiving coil for the wireless charging of 5 V portable electronics.

Offering durable construction and high permeability shielding, the new IWAS-3827EC-50 provides high efficiency greater than 70 percent for Rx applications to 10 W and is 33 percent smaller than the standard 48 mm by 32 mm IWAS-4832FF-50 Rx coil, with dimensions of 38x27mm.

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 percent at 4000 gauss (convert to T).

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

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