Power coils' pot core shape reduces outward radiation

2nd July 2014
Staff Reporter

Three transmitter coils and one receiver coil has been added to Würth Elektronik's Wireless Power Coil program. The ferrite pot core shape has major advantages, including, tightly bundling the magnetic field, increasing the possible coil distance and reducing outward radiation. The round shape also significantly reduces the mounting space required. The round transmitter coils 760 308 100 110 (A10) and 760 308 100 111 (A11) comply with the Qi standard of the WPC.

In order to offer a transmitter solution for the market of small receivers (sensors, wearables, hearing aids, etc.), 760 308 101 103 was developed. This compact transmitter coil transfers up to 5W and it also complies with the WPC Qi standard. With a diameter of 30mm, its area is
only around a third the size of coil 760 308 100 111, for example.

Today there are two inductive wireless power standards: the Qi standard of the WPC and the PMA standard of the Power Matters Alliance. Würth Elektronik offers a dual standard receiver coil – 760 308 102 210 – for this purpose. The advantage of this coil, with litz wire and
ferrite fortification in the center, is devices which use this solution can be charged on charging stations of both standards. For small receiver coils, smaller transmitter coils are also necessary, as the area ratio between transmitter and receiver coil significantly affects the efficiency of energy transmission.

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