Energy scavenging for wireless sensor networks

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Power processing circuits for electromagnetic, electrostatic and piezoelectric inertial energy scavengers (2007, neutral): “Roundy ( Roundy et al. 2003 ) and Ottman et al (2002) have both shown that piezoelectric generators can achieve higher power densities when driving resistive loads than when they are connected to a simple power supply consisting of a bridge rectifier and smoothing capacitor.”
A new S-shaped MEMS PZT cantilever for energy harvesting from low frequency vibrations below 30 Hz (2012, background): “Roundy et al. (2003b) studied some commonly available vibration sources and found that environmental sources have relatively low level of vibration (normally \1g of acceleration) as well as low frequency of vibration (normally \200 Hz).”
Nonlinear Behavior of an Electrostatic Energy Harvester Under Wide- and Narrowband Excitation (2010, background): “gap overlap type [20] also made by several other groups [19], [21], [22].”
Advances in energy harvesting using low profile piezoelectric transducers (2007, methodology): “They used the transformer based equivalent circuit for the analysis and arrived at the following expression have for the off-resonance and resonance conditions [ 7 , 9]:”
Piezoelectric Energy Harvesting Solutions: A Review (2020, background): “For applications that do not need outside sources, instead of piezoelectric transducers, electromagnetic devices can also be used [17].”