Implementation of Intermediate Passive Loop Coils to Extend the Range of Qi Wireless Charging

Wireless power transfer (WPT) based system such as Qi charging technology can not operate with a separation between transmitter and receiver coils. In this paper, a novel passive wireless loop made with magnetic wire is proposed to extend the range between the transmitter and receiver coil. One end of the proposed loop coil is placed on the Qi transmitter while the other end is placed on the Qi receiver. Experimental results are presented for coils with different number of turns and diameter, where Qi transmitter and receiver were separated by a distance of 10 inches. The proposed setup was able to reasonably provide similar performance as the traditional setup of coil nositions. while increasing the range of Oi charging.