Abstract
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.
Highlights
Wearable energy harvesting (WEH), which scavenges energy around human body and converts it to electric energy, has been the subject of scientific and technological effort worldwide in the past two decades [1]
Because the power consumption of the wireless sensor node (WSN) is higher than the charging power provided by the Mag-WKEH, VCS decreases during phase (2)
Before VCS decreases to be too low (
Summary
Wearable energy harvesting (WEH), which scavenges energy around human body and converts it to electric energy, has been the subject of scientific and technological effort worldwide in the past two decades [1]. Two circuits are fixed on the top of the Mag-WKEH: one is a rectifying circuit, and the other is a circuit comprising a power management module (PMM), an energy aware interface (EAI) and a wireless sensor node (WSN). The output of the PMM charges a 10 mF storage capacitor CCS and the energy stored in CCS is used to power the WSN under the supervision of the EAI.
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