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Title: Wireless power supply for ambient assisted living
Author: Li, Yi
Awarding Body: University of Southampton
Current Institution: University of Southampton
Date of Award: 2015
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This thesis focuses on the development of the wireless applications for Ambient Assisted Living (AAL) system, the energy harvesting technique for powering the passive sensors in the building environment, and the flexible screen printed coils for Wireless Power Transfer (WPT) system to provide the power for a body-area sensor network in an AAL system. The AAL provides safe environments around assisted peoples and help them maintain independent living. The applications in AAL include the fixed monitor sensor in building environment and the wearable sensor on users body area. For supplying power for the applications of AAL wireless power supply provides the power without cables while offers a more environmentally friendly solution. Compared with energy harvesting technology, WPT is capable of supplying more power without increasing the size of the device. In this work, a solar powered PIR sensor demonstrates that the energy harvesting technique for a passive sensor application for the fixed monitor sensor in building environment, which can work for up to 16 hours without ambient energy input. For the on-body area application, the flexible coils are employed in the WPT system because of the comfort requirement. The coils are printed on 65/35 polyester/cotton textile with a 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, and the flexibility and breathability of textile can be remained. The measured inductances of the printed flexible coils are 3.9 μH for single layer. The design of the printed coil minimises the coil’s parasitic capacitance, which is less than 25 pF, and consequently increase the self-resonant frequency of the printed coil. A 5 V 1.51 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 38% has been measured. It has been compared with the system employed with Qi standard wound copper coils which has the recorded 52% DC-DC efficiency.
Supervisor: Beeby, Stephen Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available