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Harvesting Ambient Vibration Energy over a Wide Frequency Range for Self-Powered Electronics
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posted on 2017-01-17, 16:24 authored by Xiaofeng Wang, Simiao Niu, Fang Yi, Yajiang Yin, Chenglong Hao, Keren Dai, Yue Zhang, Zheng You, Zhong Lin WangVibration is one of the most common
energy sources in ambient environment.
Harvesting vibration energy is a promising route to sustainably drive
small electronics. This work introduces an approach to scavenge vibrational
energy over a wide frequency range as an exclusive power source for
continuous operation of electronics. An elastic multiunit triboelectric
nanogenerator (TENG) is rationally designed to efficiently harvest
low-frequency vibration energy, which can provide a maximum instantaneous
output power density of 102 W·m–3 at as low
as 7 Hz and maintain its stable current outputs from 5 to 25 Hz. A
self-charging power unit (SCPU) combining the TENG and a 10 mF supercapacitor
gives a continuous direct current (DC) power delivery of 1.14 mW at
a power management efficiency of 45.6% at 20 Hz. The performance of
the SCPU can be further enhanced by a specially designed power management
circuit, with a continuous DC power of 2 mW and power management efficiency
of 60% at 7 Hz. Electronics such as a thermometer, hygrometer, and
speedometer can be sustainably powered solely by the harvested vibration
energy from a machine or riding bicycle. This approach has potential
applications in self-powered systems for environment monitoring, machine
safety, and transportation.
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power management circuit7 HzWide Frequency RangeTENGHarvesting vibration energypower management efficiencyoutput power densityelectronicmultiunit triboelectric nanogeneratorHarvesting Ambient Vibration Energyvibration energySelf-Powered Electronics Vibrationself-charging power unitscavenge vibrational energyDC10 mF supercapacitorSCPU
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