Design And Development Of A Wearable Thermoelectric Generator Armband To Power Up Low Power Electronic Devices

Tan, Dion Piu Sern (2017) Design And Development Of A Wearable Thermoelectric Generator Armband To Power Up Low Power Electronic Devices. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Over the past decades,more and more research efforts have been made to harvesting ambient environmental energy owing to the rapid-growing worldwide energy consumptions. Nowadays,wearables such as wireless body networks are battery-powered,and the battery itself has a limited lifeline.In medical area,Wireless Body Area Sensor Network (WBASN) is used to monitor a patient’s health conditions.Not having sufficient portable power electricity to keep these devices powered up is a huge problem these days.Also,increasing battery usage also contributes to the growing of worldwide energy usage. Thermoelectric generators (TEGs) provide a very special opportunity for the society to overcome world energy consumption issue by providing clean and renewable energy to human.The purpose of this study is to design a wearable thermoelectric generator armband for powering low power wireless sensor (pulse sensor).Besides that,A signal conditioning circuit is designed to boost input signals from TEGs and an algorithm is designed for the pulse sensor to detect heart rate before transmitting the data wirelessly via Bluetooth to a designed Graphical User Interface.Six TEGs are used to build the prototype, with a mixture of parallel and series thermal configurations.LTC3108 and CE8301 boost converters are used to construct the signal conditioning circuit.A 0.5 F supercapacitor is used to store harvested energy.The algorithm developed for pulse sensor is by finding successive moments of instantaneous heart beat and measure the Inter Beat Interval by following the predictable pattern of photoplethysmogram wave.The automatic (AT) commands are used in Bluetooth modules for wireless transmission.In the end,the final prototype can power up the pulse sensor after about 6-hour period when it is worn on human arm.The pulse sensor reads accurate data and successfully transmitting it to base station. The prototype extends battery life up to 44 %.

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