Fobelets, K;
Sareen, KS;
Thielemans, K;
(2021)
Magnetic coupling with 3D knitted helical coils.
Sensors and Actuators A: Physical
, 332
(2)
, Article 113213. 10.1016/j.sna.2021.113213.
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Abstract
Continuous power supply for wearable electronics can be facilitated using wireless power transfer (WPT). We use a 3D knitted helical coil as the receiver coil in the wrist or the waist of a garment. This 3D knitted helical coil is a novel approach to integrate coils in garments that maintains full flexibility of the garment. Measurements and simulations of coil-coil coupling give compelling evidence of the feasibility of this approach for wearable WTP. The coupling factor between a closely wound and knitted coil is found to be ~0.25 and ~0.55 for adjacent coils for a knit in the border of a cuff and waist, respectively. Using a simple circuit, we demonstrate a 30% efficiency between a closely wound transmitter coil worn on the wrist and a 3D knitted helical receiver coil integrated in the cuff of a garment at 6 mm distance.
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