Embroidered Textile Coils for Wireless Charging of Smart Garments

In this paper, we report a method of using embroidery to fabricate textile inductor coils for wireless charging of wearable sensor devices on smart garments. Electrical properties of embroidered coils are measured and compared with simulation. A process of making embroidered coils with crossover connections is proposed. An embroidered coil array structure is designed and tested in two wireless charging systems and the results show that it can charge a lithium-ion battery with currents ranging up to 100 mA.