Optimal parameters and power characteristics of piezoelectric energy harvesters with an RC circuit

摘要: A piezoelectric based energy harvesting scheme is proposed here which places a capacitor before the load in conditioning circuit. It well known that impedance between and source contributes greatly to performance of system. The additional provides flexibility achieving optimal value can be used expand bandwidth theoretical model system derived response system, as function both resistance capacitance, studied. analysis shows dominated by bifurcation occurring electromechanical coupling increases above certain value: below this point, addition an does not increase systems; it, maximum power achieved at all points these two frequencies. Additionally, it has been found capacitance independent resistance. Therefore, necessary chosen, then determined, for providing desired For systems with low coupling, added negative (additional circuit), indicating second should used. high becomes positive range values frequencies extend also demonstrates same harvested any frequency; however, outside must negative.