Consideration of Impedance Matching Techniques for Efficient Piezoelectric Energy Harvesting

Enhanced vibration energy harvesting using dual-mass systems

“…Hence, researchers have been seeking ways to improve the energy harvesting rate by both mechanical and electrical approaches. Since the electrical and mechanical systems are coupled by the transducers, the energy extracted from the mechanical system can be optimized or controlled by the energy harvesting circuit, as seen in [9,10] and many references therein. Static force magnification or motion magnification mechanisms such as level and gears [11,12] are also used to increase the power.…”

Energy harvesting with a cymbal type piezoelectric transducer from low frequency compression

“…Various potential piezoelectric materials and structures have been tested for energy harvesting applications because the target specifications and environmental conditions strongly dictate feasible material and design options [8][9][10][11][12][13][14]. One very challenging area is energy harvesting directly from human body, thus enabling charging of portable electronics.…”

“…More recently, energy harvester designs and models of the Cymbal transducers have also been introduced. Studies have shown their feasibility for energy harvesting because of their high reliability and small deviation in long term usage [11,[26][27][28]. In this article we present a Cymbal type energy harvester component aimed for mounting in a shoe insole.…”

Analyses of impedance matching for piezoelectric energy harvester with a resistive circuit

“…To study the maximum output power at different excitation frequency, we use two resistances, the matched resistance and the optimal resistance. The resistance of output circuit matched to the internal capacitive impedance of the piezoelectric materials is denoted as the matched resistance [12] ( R L = 1 / a)C 0 ), where C 0 =W 33 bL/ h . The resistance of output circuit to yield maximum output power is denoted as the optimal resistance [8] .…”