Energy autonomous wireless sensing system enabled by energy generated during human walking
Journal of Physics: Conference Series
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Recently, there has been a huge amount of work devoted to wearable energy harvesting (WEH) in a bid to establish energy autonomous wireless sensing systems for a range of health monitoring applications. However, limited work has been performed to implement and test such systems in real-world settings. This paper reports the development and real-world characterisation of a magnetically plucked wearable knee-joint energy harvester (Mag-WKEH) powered wireless sensing system, which integrates our latest research progresses in WEH, power conditioning and wireless sensing to achieve high energy efficiency. Experimental results demonstrate that with walking speeds of 3~7 km/h, the Mag-WKEH generates average power of 1.9~4.5 mW with unnoticeable impact on the wearer and is able to power the wireless sensor node (WSN) with three sensors to work at duty cycles of 6.6%~13%. In each active period of 2 s, the WSN is able to measure and transmit 482 readings to the base station
The authors gratefully acknowledge the financial support from the EPSRC through project EP/K017950/2.
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PowerMEMS 2016,December 6 – 9, 2016. The 16th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, Paris, France
Vol 773 (2016), Conference 1, article 012050