A piezoelectric energy harvester (PEH) consists of an electromechanical structure and an electric circuit that influence each other. An implicit coupling between a finite element simulation of the electromechanical structure and an electronic circuit simulator, recently introduced by the authors, is applied to the analysis of a PEH. The PEH is equipped with a self-powered electric circuit and the nonlinear and non-ideal behavior of its transistors and diodes and the nonlinear material behavior of the electromechanical structure are considered in the simulations. Harmonic and shock-like base excitations are applied and the behavior of the PEH is carefully analyzed.
A finite element method to simulate energy harvesters, recently introduced by the authors, is applied to investigate the transient charging behavior of a strongly coupled bimorph piezoelectric vibration-based energy harvester for a harmonic and a shock-like triangular pulse excitation. The system simulation method is extended to allow for charging a capacitor and the standard and the synchronized switch harvesting on inductor (SSHI) circuits are considered. The simulation results show that the standard circuit is more efficient for the harmonic excitation, while the SSHI circuit is more efficient for the shock-like triangular excitation. The influence of different capacitors is discussed.
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