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A novel dual piezoelectric-electromagnetic energy harvester employing up-conversion technology for the capture of ultra-low-frequency human motion

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Listed:
  • Shi, Ge
  • Liang, Xing
  • Xia, Yinshui
  • Jia, Shengyao
  • Hu, Xiangzhan
  • Yuan, Mingzhu
  • Xia, Huakang
  • Wang, Binrui

Abstract

As the realm of smart wearable electronic devices undergoes continuous evolution, tapping into the energy generated by everyday human movement presents a compelling alternative to conventional batteries for powering these devices. However, conventional energy harvesting devices face limitations in capturing energy from ultra-low frequency mechanical excitation. This paper proposes a novel dual piezoelectric-electromagnetic energy harvester (DHEH). The DHEH consists of two PZTs comprising the piezoelectric energy harvesting unit (PEH), arc-shaped driving magnets, and two sets of coils constituting the electromagnetic energy harvesting unit (EMEH). The arc-shaped driving magnet facilitates coupling between two units, serving to generate a relative motion with the coils for energy harvesting and triggering the operation of the two PZTs. The excitation magnets can penetrate the coils completely. Meanwhile, employing two arc-shaped magnets with a repelling orientation can effectively enhance the power generation efficiency of the EMEH. Experimental findings indicate that under an external excitation of 2 Hz and an acceleration of 0.6 g, the optimal load resistance for the Piezoelectric Energy Harvester (PEH) is 80 kΩ, yielding a maximum output power of 0.306 mW. For the EMEH, the best-matched load is 96 Ω, resulting in a maximum output power of 10.65 mW, with a power density of 86.3 μW/cm3. Compared to the non-hybrid solution, adopting a hybrid approach increases the efficiency of the PEH by approximately 23-fold. Furthermore, hand-shaking tests reveal that the fabricated prototype of the DHEH can power common portable electronic devices, demonstrating its significant potential for practical applications.

Suggested Citation

  • Shi, Ge & Liang, Xing & Xia, Yinshui & Jia, Shengyao & Hu, Xiangzhan & Yuan, Mingzhu & Xia, Huakang & Wang, Binrui, 2024. "A novel dual piezoelectric-electromagnetic energy harvester employing up-conversion technology for the capture of ultra-low-frequency human motion," Applied Energy, Elsevier, vol. 368(C).
    • Handle: RePEc:eee:appene:v:368:y:2024:i:c:s0306261924008626
    DOI: 10.1016/j.apenergy.2024.123479
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    References listed on IDEAS

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