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An electrostatic in-plane overlap varying energy harvester is modeled andsimulated using a circuit simulator. Both linear and nonlinear models areinvestigated. The nonlinear model includes mechanical stoppers at thedisplacement extremes. Large amplitude excitation signals, both narrow and wideband, are used to emulate environmental vibrations. Nonlinear behavior issignificant at large displacement due to the impact on mechanical stoppers. Fora sinusoidal excitation the mechanical stoppers cause the output power toflatten and weakly decrease. For a wide band excitation, the output power firstincreases linearly with the power spectral density of the input signal, thengrows slower than linearly.

Simulation of an Electrostatic Energy Harvester at Large Amplitude Narrow and Wide Band Vibrations