Alignment-Free Wireless Charging of Smart Garments with Embroidered Coils

Wireless power transfer (WPT) technologies have been adopted by many products. The capability of charging multiple devices and the design flexibility of charging coils make WPT a good solution for charging smart garments. The use of an embroidered receiver (RX) coil makes the smart garment more brea...

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Autores principales:	Chin-Wei Chang, Patrick Riehl, Jenshan Lin
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	wireless power transfer wireless charging inductive coupling smart garment embroidered coil alignment-free wireless charging Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/b1ea2654a96c412c9e7fa5ed13eee492
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id	oai:doaj.org-article:b1ea2654a96c412c9e7fa5ed13eee492
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spelling	oai:doaj.org-article:b1ea2654a96c412c9e7fa5ed13eee4922021-11-11T19:18:35ZAlignment-Free Wireless Charging of Smart Garments with Embroidered Coils10.3390/s212173721424-8220https://doaj.org/article/b1ea2654a96c412c9e7fa5ed13eee4922021-11-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/7372https://doaj.org/toc/1424-8220Wireless power transfer (WPT) technologies have been adopted by many products. The capability of charging multiple devices and the design flexibility of charging coils make WPT a good solution for charging smart garments. The use of an embroidered receiver (RX) coil makes the smart garment more breathable and comfortable than using a flexible printed circuit board (FPCB). In order to charge smart garments as part of normal daily routines, two types of wireless-charging systems operating at 400 kHz have been designed. The one-to-one hanger system is desired to have a constant charging current despite misalignment so that users do not need to pay much attention when they hang the garment. For the one-to-multiple-drawer system, the power delivery ability must not change with multiple garments. Additionally, the system should be able to charge folded garments in most of the folding scenarios. This paper analyses the two WPT systems for charging smart garments and provides design approaches to meet the abovementioned goals. The wireless-charging hanger is able to charge a smart garment over a coupling variance <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mfrac><mrow><msub><mi>k</mi><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msub></mrow><mrow><msub><mi>k</mi><mrow><mi>m</mi><mi>i</mi><mi>n</mi></mrow></msub></mrow></mfrac><mo>=</mo><mn>2</mn></mrow></semantics></math></inline-formula> with only 21% charging current variation. The wireless-charging drawer is able to charge a smart garment with at least 20 mA under most folding scenarios and three garments with stable power delivery ability.Chin-Wei ChangPatrick RiehlJenshan LinMDPI AGarticlewireless power transferwireless charginginductive couplingsmart garmentembroidered coilalignment-free wireless chargingChemical technologyTP1-1185ENSensors, Vol 21, Iss 7372, p 7372 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	wireless power transfer wireless charging inductive coupling smart garment embroidered coil alignment-free wireless charging Chemical technology TP1-1185
spellingShingle	wireless power transfer wireless charging inductive coupling smart garment embroidered coil alignment-free wireless charging Chemical technology TP1-1185 Chin-Wei Chang Patrick Riehl Jenshan Lin Alignment-Free Wireless Charging of Smart Garments with Embroidered Coils
description	Wireless power transfer (WPT) technologies have been adopted by many products. The capability of charging multiple devices and the design flexibility of charging coils make WPT a good solution for charging smart garments. The use of an embroidered receiver (RX) coil makes the smart garment more breathable and comfortable than using a flexible printed circuit board (FPCB). In order to charge smart garments as part of normal daily routines, two types of wireless-charging systems operating at 400 kHz have been designed. The one-to-one hanger system is desired to have a constant charging current despite misalignment so that users do not need to pay much attention when they hang the garment. For the one-to-multiple-drawer system, the power delivery ability must not change with multiple garments. Additionally, the system should be able to charge folded garments in most of the folding scenarios. This paper analyses the two WPT systems for charging smart garments and provides design approaches to meet the abovementioned goals. The wireless-charging hanger is able to charge a smart garment over a coupling variance <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mfrac><mrow><msub><mi>k</mi><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msub></mrow><mrow><msub><mi>k</mi><mrow><mi>m</mi><mi>i</mi><mi>n</mi></mrow></msub></mrow></mfrac><mo>=</mo><mn>2</mn></mrow></semantics></math></inline-formula> with only 21% charging current variation. The wireless-charging drawer is able to charge a smart garment with at least 20 mA under most folding scenarios and three garments with stable power delivery ability.
format	article
author	Chin-Wei Chang Patrick Riehl Jenshan Lin
author_facet	Chin-Wei Chang Patrick Riehl Jenshan Lin
author_sort	Chin-Wei Chang
title	Alignment-Free Wireless Charging of Smart Garments with Embroidered Coils
title_short	Alignment-Free Wireless Charging of Smart Garments with Embroidered Coils
title_full	Alignment-Free Wireless Charging of Smart Garments with Embroidered Coils
title_fullStr	Alignment-Free Wireless Charging of Smart Garments with Embroidered Coils
title_full_unstemmed	Alignment-Free Wireless Charging of Smart Garments with Embroidered Coils
title_sort	alignment-free wireless charging of smart garments with embroidered coils
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b1ea2654a96c412c9e7fa5ed13eee492
work_keys_str_mv	AT chinweichang alignmentfreewirelesschargingofsmartgarmentswithembroideredcoils AT patrickriehl alignmentfreewirelesschargingofsmartgarmentswithembroideredcoils AT jenshanlin alignmentfreewirelesschargingofsmartgarmentswithembroideredcoils
_version_	1718431605164343296

Alignment-Free Wireless Charging of Smart Garments with Embroidered Coils

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