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Energy harvesting is the act of scavenging small amounts of power from the
ambient energy resources. Such ambient energy can come from various green energy sources
such as solar, thermal, wind, and kinetic energy. These amounts of energy can power up
sensor nodes and therefore reduce the wiring complications or eliminate the need of changing
batteries frequently. Two of the most popular methods for harvesting energy consisted of the
application of piezoelectric and pyroelectric materials in scavenging energy from vibration
and thermal gradients, respectively. This paper presents a hybrid harvesting technique by
piezoelectric and pyroelectric effect, simultaneously. The concept of method and theoretical
analysis is presented in details for parallel and series SSHI (synchronize switch harvesting on
inductor). Numerical results are examined and show better performance compare with
piezogenerators for PZT and PMN-0.25PT elements. In this paper it has been proven that
hybrid energy harvesting energy by pyroelectric and piezoelectric effect, simultaneously,
increases almost 38 % and 53 % more power as it does harvest by just piezoelectric effect.
Followed by mentioned analyses the effect of three important parameters -temperature
amplitude, vibration amplitude, and frequency- are examined. The more effective harvesting
method and material is proposed in the final part of the paper.
Keywords: energy harvesting; piezoelectric; pyroelectric; MEMS; hybrid technique, SSHI |
full paper (pdf, 1696 Kb)