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 0.4 g
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 /cm3, which is 6.8 times that of conventional counterpart
(13.6 mW/cm3).The measured results demonstrate the potential of the device applied to portable and implantable electronics benefited from the MEMS batch-fabrication technology.