Efficiency Improvement of Vibration Power Generation by Extremum Seeking Control against Vibration Randomness

Abstract

Vibration power generation utilizing environmental vibrations to generate electricity has been attracting attention as a sustainable independent power source for such as wireless sensors placed under vibration. For efficient power generation, the resonant frequency of the vibration power generation device must be automatically adjusted to the environmental vibrations. To achieve it, the author's group proposes a method of installing a variable capacitance in the device and adjusting its capacitance by extremum seeking control. In the case of damped vibration applied, even if the amplitude and frequency of the vibration vary randomly if their distributions can be regarded as stationary and identical, an effective extremum seeking control method and its effectiveness are demonstrated using experiments.