scholarly journals Alignment-Free Wireless Charging of Smart Garments with Embroidered Coils

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7372
Author(s):  
Chin-Wei Chang ◽  
Patrick Riehl ◽  
Jenshan Lin
Keyword(s):  
Printed Circuit Board ◽  
Power Delivery ◽  
Circuit Board ◽  
Wireless Charging ◽  
Design Flexibility ◽  
Flexible Printed Circuit ◽  
Charging Current ◽  
Multiple Devices ◽  
Smart Garments ◽  
The One

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 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.

Wireless charging with textiles through harvesting and storing energy from body movement

2018 ◽  
Vol 89 (3) ◽  
pp. 347-353 ◽  
Author(s):  
Min Joo Jeong ◽  
Kunho Park ◽  
Jong Jin Baek ◽  
Se Woong Kim ◽  
Youn Tae Kim
Keyword(s):  
Resonant Frequency ◽  
Printed Circuit Board ◽  
Body Movement ◽  
Human Movement ◽  
Transmission Efficiency ◽  
Circuit Board ◽  
Wireless Charging ◽  
Current Converter ◽  
Flexible Printed Circuit ◽  
Conductive Yarn

This paper presents a wireless charging method based on textiles through harvesting and storing energy from human movement. The proposed method uses resonant coils made of a conductive yarn and a flexible printed circuit board. The conductive yarn consists of polyurethane-coated copper and polyester filaments. The transmission characteristics of the resonant coils, which were worn on the arm of a human body, were evaluated using simulation and measurement tools. It was determined that the change in the resonant frequency of the conductive-yarn resonant coils can be obtained from the coil length, stitch intervals, and fabric thickness using equations. The measured resonant frequencies of the sending and receiving coils were designed to achieve a resonant frequency of 13.56 MHz when the coils are worn. The resonant coils were worn on the arm of a subject, who moved at various speeds, and the transmission efficiency was measured using an alternating current–direct current converter. The measurement results showed a maximum transmission efficiency of 55.1%, even though the resonant coils were worn around the arm and not the leg, and an average transmission efficiency of 52.1% when the subject was moving at a speed of 6 km/h.

scholarly journals Flexible Printed Circuit Board as Novel Electrodes for Acoustofluidic Devices

2020 ◽  
pp. 1-6
Author(s):  
Chao Sun ◽  
Roman Mikhaylov ◽  
Yongqing Fu ◽  
Fangda Wu ◽  
Hanlin Wang ◽  
...  
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Printed Circuit ◽  
Flexible Printed Circuit

Optimized Positional Compensation Parameters for Exposure Machine for Flexible Printed Circuit Board

2015 ◽  
Vol 11 (6) ◽  
pp. 1366-1377 ◽  
Author(s):  
Jinn-Tsong Tsai ◽  
Chorng-Tyan Lin ◽  
Cheng-Chung Chang ◽  
Jyh-Horng Chou
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Printed Circuit ◽  
Flexible Printed Circuit

Hybrid Fabrication of LED Matrix Display on Multilayer Flexible Printed Circuit Board

2021 ◽  
Author(s):  
Thanh Huy Phung ◽  
Jaehyeong Jeong ◽  
Anton Nailevich Gafurov ◽  
Inyoung Kim ◽  
Sung Yong Kim ◽  
...  
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Printed Circuit ◽  
Flexible Printed Circuit ◽  
Led Matrix

Superconducting Multilayer High-Density Flexible Printed Circuit Board for Very High Thermal Resistance Interconnections

2018 ◽  
Vol 193 (3-4) ◽  
pp. 578-584 ◽  
Author(s):  
Xavier de la Broïse ◽  
Alain Le Coguie ◽  
Jean-Luc Sauvageot ◽  
Claude Pigot ◽  
Xavier Coppolani ◽  
...  
Keyword(s):  
Thermal Resistance ◽  
Printed Circuit Board ◽  
High Density ◽  
Circuit Board ◽  
Printed Circuit ◽  
Flexible Printed Circuit ◽  
High Thermal Resistance ◽  
Very High

scholarly journals A Diffusor/Nozzle Pump Based on a Magnetically Actuated Flexible PCB Diaphragm

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1077
Author(s):  
Marcus A. Hintermüller ◽  
Bernhard Jakoby
Keyword(s):  
Printed Circuit Board ◽  
Microfluidic Channel ◽  
Circuit Board ◽  
Fabrication Method ◽  
Flexible Membrane ◽  
Printed Circuit ◽  
Magnetically Actuated ◽  
Lorentz Forces ◽  
Out Of Plane ◽  
Flexible Printed Circuit

We present a valveless microfluidic pump utilizing an oscillating membrane made from a flexible printed circuit board. The microfluidic channel is fabricated by a 3D printing process and features diffuser/nozzle structures to obtain a directed flow; the flexible membrane is bonded to the channel. The membrane is actuated via Lorentz forces to accomplish out-of-plane motions and push the fluid through the channel. A permanent magnet provides the static magnetic field required for the actuation. The simple fabrication method can potentially be used for inexpensive mass fabrication for disposable devices.

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