Effect of nonlinear external circuit on electrostatic damping force of micro electret generator

A complete electromechanical model of vibration-driven micro electret power generators has been developed, and its characteristics are directly compared with experimental data to verify the model. Nonlinear power management circuit for rectification and impedance conversion is also assumed. It is found that the electrostatic damping force acting on the seismic mass is dependent on the external circuit. From coupling simulation with a mechanical vibration model, it is also found that the circuit parameters should be optimized dependent on the oscillation condition.