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

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

Applied Energy, 2024, vol. 368, issue C, No S0306261924008626

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.

Keywords: Piezoelectric-electromagnetic hybrid; Ultra-low-frequency vibration; Energy harvesting; Wearable devices (search for similar items in EconPapers)
Date: 2024
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Citations: View citations in EconPapers (1)

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DOI: 10.1016/j.apenergy.2024.123479

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