Energy Autonomous Wireless Sensing System Enabled by Energy Generated during Human Walking

[摘要] 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.

[发布机构] College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter; EX4 4QJ, United Kingdom^1

[效力级别] 能源学

[关键词] Energy Harvester;Health monitoring;High energy efficiency;Power conditioning;Real world setting;Three sensors;Wireless sensing;Wireless sensor nodes (WSN)