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Open AccessArticle

Textile-Based Flexible Coils for Wireless Inductive Power Transmission

Electronics and Computer Science, University of Southampton, Southampton SO17 1BJ, UK
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Appl. Sci. 2018, 8(6), 912; https://doi.org/10.3390/app8060912
Received: 5 February 2018 / Revised: 25 May 2018 / Accepted: 25 May 2018 / Published: 1 June 2018
(This article belongs to the Section Energy)
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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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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