Mechanical Energy Harvester With Ultralow Threshold Rectification Based on SSHI Nonlinear Technique

Nonlinear Conversion Enhancement for Efficient Piezoelectric Electrical Generators

“…For example, the rectifier bridge may be replaced by the switching elements (Figure 17(a)), allowing the removal of the diodes. Another approach consists of replacing the switching inductance by a transformer (Figure 17(b)), leading to the concept of SSHI-MR 10 (Garbuio et al, 2009), which also presents the advantage of having a higher optimal load and therefore delivers voltage levels that are compatible with electronic systems when the electromechanical structure delivers low voltage levels. Because of the load decoupling offered by the use of the transformer, the SSHI-MR technique may be combined with the parallel energy harvesting system, leading to the concept of hybrid energy harvesting (Lallart, 2008d;2010d), which allows a decreased sensitivity to load shifts.…”

An Energy Supply System for Wireless Sensor Network Nodes

“…They are based on one of these principles: reducing the power loss in rectifying diodes [12], improving the extracted power by using an adaptive circuit [13,14], adaptive control of the rectified DC voltage [15], or adjusting the natural frequency of piezoelectric energy harvesters [16]. At present, there are three predominant energy harvesting circuits: the passive diode-rectifier circuit [17], the semiactive circuit [18][19][20], and the active circuit [21]. The passive diode-rectifier circuit is the simplest technology, and its efficiency is the lowest.…”

Ferroelectric Materials for Small-Scale Energy Harvesting Devices and Green Energy Products

“…This may be a serious issue when dealing with energy harvesting as energy harvesting interfaces feature discrete components such as diodes or transistors that present voltage gaps due to their semiconductor nature, hence compromising the operations of the microgenerators. In order to counteract this drawbacks, it is possible to replace the inductance of the series SSHI by a transformer in order to divide the threshold voltage of diodes seen by the piezoelectric element (Garbuio et al, 2009), or to use mechanical rectifiers (Nagasawa et al, 2008).…”