The wireless charging technology features coils designed for high humidity and optimized for industrial and consumer devices, ensuring durability and efficient power transfer.
Vishay Intertechnology, Inc. has launched new wireless charging transmitter (Tx) and receiver (Rx) coils made from powdered iron, designed for high humidity up to 90% RH. Suitable for industrial, medical, and consumer electronics applications up to 30 W, the Vishay Dale models IWAS3222CZEB190JR1, IWTX4646DCEB240JR1, IWTX47R0DAEB6R3JR1, and IWTX47R0EBEB240JR1 operate at temperatures up to +105 °C and offer a smaller footprint than previous generations and competing products.
These devices resist moisture effectively thanks to a shield coating that protects against environmental factors. The powdered iron in these coils prevents the inductance drop-offs and temperature sensitivity typical of ferrite-based solutions. At the same time, the shield material enhances inductance, controls flux leakage, and directs flux efficiently.
With a copper winding, the Rx coil delivers an inductance of 19.6 μH, a Q of 28.5 at 200 kHz, and a DCR of 357 mΩ. The Tx coils models offer inductance ranging from 6.3 μH to 24 μH, DCR as low as 40 mΩ, and Q up to 200. They support heat rating currents up to 7 A and saturation currents up to 22 A, ensuring stable inductance and consistent performance.
For durability, the Tx coils use litz wire to prevent scratching and wire deformation, improve insulation, and minimize electrical losses. The IWTX4646DCEB240JR1 and IWTX47R0EBEB240JR1 coils use an alpha winding technique for a compact, low-profile design.
These coils are intended for various applications, including handheld tools, medical instruments, drones, smartphones, tablets, gaming controllers, and wearables. They are RoHS-compliant, halogen-free, and adhere to Vishay’s Green standards. They are available in various shapes, including rectangular, square, and round.
