Improving Power Output for Vibration-Based Energy Scavengers
IEEE Pervasive Computing
A MEMS-based piezoelectric power generator array for vibration energy harvesting
Microelectronics Journal
Non-resonant electromagnetic wideband energy harvesting mechanism for low frequency vibrations
Microsystem Technologies
A study of low level vibrations as a power source for wireless sensor nodes
Computer Communications
Increasing the bandwidth of the width-split piezoelectric energy harvester
Microelectronics Journal
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A low-frequency piezoelectric energy harvester based on impact vibration assembled with a compliant driving beam and two rigid generating beams is presented. The ambient low frequency is up-converted to high resonant frequency by the periodic impact between the driving beam and the generating beams. The advantages of the harvester are: restricting the large displacement of the compliant driving beam, improving power density and being especially suitable for a compact MEMS approach. The 1.53mW average power of the macroscale impact vibration harvester is achieved at 20.1Hz under 0.4g acceleration. The power density is 93.2@mW/cm^3, which is 6.8 times that of conventional counterpart (13.6@mW/cm^3). The measured results demonstrate the potential of the device applied to portable and implantable electronics benefited from the MEMS batch-fabrication technology.