HomeIndustry news Transmitter Coil Offers High Efficiency for Qi Wireless Charging Pads

Transmitter Coil Offers High Efficiency for Qi Wireless Charging Pads

October 11, 2014 By admin Comments are Off , , , ,

Vishay Intertechnology, Inc. today announced a new powdered-iron-based, WPC-compliant (Wireless Power Consortium) wireless charging transmitter coil for Qi wireless charging pads. Offering a durable construction and high permeability shielding, the new Vishay Dale IWTX-4646BE-50 provides high efficiency greater than 70% at a 19 V input voltage when tested using WPC-compliant transmitter and receiver chipsets and a Vishay Dale IWAS-4832FF-50 receiver coil with 2.7 mm spacing.

Designed for use in conjunction with Vishay’s WPC-compliant wireless receiver coils, the IWTX-4646BE-50’s high-saturation powdered iron is not affected by permanent locating magnets. As an alternative to larger ferrite-based solutions — which can saturate in the presence of a strong magnetic field — the IWTX-4646BE-50 offers a magnetic saturation of 50 % at 4,000 gauss.

The RoHS-compliant device features inductance of 24 µH at 200 kHz with a ± 5% inductance tolerance, DCR of 71 mΩ (± 10%) at + 25 degrees C, and Q of 185 typical at 200 kHz. The transmitter coil features a lead length of 40 mm and tinned length of 5 mm, heat rated current of 6 A, saturation current of 20 A, and self-resonant frequency of 7 MHz. AEC-Q200 certification for use in automotive applications is pending, and expected to be complete in Q1 2015.

Related: Wafer-Level Testing of Power Semiconductors

Samples and production quantities of the IWTX-4646BE-50 Tx coil are available now, with lead times of 14 weeks for large orders. Pricing for U.S. delivery only is $2.50 per piece in 10,000-piece quantities.

source: http://www.powerpulse.net/story.php?storyID=30872

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