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An ultra-low-frequency, broadband, multi-stable,frequency up converted and piezoelectricelectromagnetic-triboelectric hybrid energy harvester for powering portable electronics

An ultra-low-frequency, broadband, multi-stable,frequency up...

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第十八届全国非线性振动暨第十五届全国非线性动力学和运动稳定性学术会议（NVND2021）

作者： Chen Wang School of Civil Engineering and Mechanics Yanshan University

In this work, a highly miniaturized, ultra-low-frequency, broadband, multi-stable, frequency up-converted and piezoelectric-electromagnetic-triboelectric hybrid portable energy harvester is presented to harvest biomechanical vibrations efficiently. This harvester is developed by using a novel multi-stability-based frequency up-converted approach, in which two new configurations of magneto-multi-stable oscillators are highly integrated so that the displacement stroke of the low-frequency vibration and the mechanical energy transfer process can overlap almost completely, and consequently,magnify the power output and power density under low-frequency broadband vibrations. Subsequently, by hybridizing two impact-based piezoelectric generators, an electromagnetic generator, a sliding triboelectric nanogenerator and a contact-separation triboelectric nanogenerator in a highly compact arrangement, more electric power can be generated from single mechanical motion, which successfully enhanced the output performance. A prototype was fabricated and tested using both shaker and human motions. Under the shaker testing, the prototype performed a wide bandwidth of 1-11 Hz for tri-stable mode(vertical) and 1-12 Hz for quad-stable mode(horizontal), and generated maximum output powers of 85.65 mW across the optimum resistances, corresponding to a normalized power density of 3.69 m W cm-3 g-2 at 3 Hz under 1 *** human motion testing, the prototype showed good performance in different wearable position of the human body and could power thermohygrometers and 100 commercial light-emitting diodes *** study shows the great potential of the proposed harvester as a sustainable power source for wearable and portable electronics.

关键词： Tri-stable nonlinearity piezoelectric-electromagnetic-triboelectric hybrid Frequency up-conversion blue energy human biomechanical energy

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