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Appl. Sci. 2018, 8(6), 912;

Textile-Based Flexible Coils for Wireless Inductive Power Transmission

Electronics and Computer Science, University of Southampton, Southampton SO17 1BJ, UK
Author to whom correspondence should be addressed.
Received: 5 February 2018 / Revised: 25 May 2018 / Accepted: 25 May 2018 / Published: 1 June 2018
(This article belongs to the Section Energy)
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Wireless inductive power transmission systems can potentially supply wearable devices. Power cables or batteries can be eliminated by implementing a wireless power transfer system, making the wearable devices less obtrusive to users. However, rigid coils can cause discomfort to users in wearable applications. The novel screen-printed flexible coils on textiles reported here are intended to be a low-cost and comfortable solution when integrated into clothing. A constant-width circular-spiral flat coil has been designed to minimize the detrimental effect of the low conductivity of the screen-printed flexible conductors on the efficiency of the wireless power transfer system. The coils are printed on 65/35 polyester/cotton textile with a screen-printed Fabink-UV-IF1 interface layer coating. The interface layer provides a relatively flat and smooth surface to prevent the permeation of the conductive paste into the textile and allows the printing of finer-profile coils. A 5 V 1.2 W DC output has been achieved by a wireless power transfer system using the printed flexible coils with Qi standard circuitry; a DC-DC efficiency of 37% has been measured. View Full-Text
Keywords: inductive power transmission; coil design; smart textile; screen printing; resonant coupling inductive power transmission; coil design; smart textile; screen printing; resonant coupling

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Li, Y.; Grabham, N.; Torah, R.; Tudor, J.; Beeby, S. Textile-Based Flexible Coils for Wireless Inductive Power Transmission. Appl. Sci. 2018, 8, 912.

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