Abstract
Synchronized-switching techniques have significantly enhanced the harvested energy from semipassive and active surrounding ambient mechanical vibration harvesters. They have allowed a large improvement of vibration-control efficiency using piezoelectric devices. Unfortunately, for such techniques, dielectric limitations appear as soon as the piezoceramic operates under external solicitation of higher amplitudes and frequencies. Under extreme conditions, active materials exhibit nonlinear behavior related to dielectric hysteresis that significantly reduces their performance. In this work, we focus on this nonlinear behavior and its consequences in terms of system efficiency. We apply a realistic model including accurate material laws. In such models, a constant piezoelectric coupling d 31 is not suitable as a coefficient anymore and it should be replaced by a function depending on the polarization level through the active material. The response of more realistic systems including hysteresis was taken into account and compared with the basic model, where a constant d 31 was considered.
Highlights
Energy harvesting is under intensive study to build an alternative way to power small electronics, portable devices, and/or to recharge batteries
When the voltage of the piezoelectric elements reaches an extremum, the switch connects the piezoelectric elements to the inductive circuit, which leads to an inversion of this voltage
For the purpose of energy harvesting, this method is modified to Synchronized Switch Harvesting on Inductor (SSHI) [15,16]
Summary
Energy harvesting is under intensive study to build an alternative way to power small electronics, portable devices, and/or to recharge batteries. An electronic switch and an inductance, L, connected in series or in parallel to the piezoelectric transducer (Figure 1). When the voltage of the piezoelectric elements reaches an extremum, the switch connects the piezoelectric elements to the inductive circuit, which leads to an inversion of this voltage. For the purpose of energy harvesting, this method is modified to Synchronized Switch Harvesting on Inductor (SSHI) [15,16]. This technique carries out a nonlinear procedure of voltage processing at the piezoelectric transducer [17,18,19,20]. In the passive technique case, piezoelectric transducers are directly connected to an electrical dissipative shunt
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