A scalable piezoelectric impulse-excited energy harvester for human body excitation

摘要: Harvesting energy from low-frequency and non-harmonic excitations typical of human motion presents specific challenges. While resonant devices do have an advantage in environments where the excitation frequency is constant, while they can make use entire proof mass travel range case amplitudes that are smaller than internal displacement limit, not suitable for body applications since frequencies random tend to be larger device size. In this paper a piezoelectric, impulse-excited approach presented. A cylindrical actuates array piezoelectric bi-morph beams through magnetic attraction. After initial these transducers left vibrate at their natural frequency. This increases operational as well electromechanical coupling. The principle impulse discussed centimetre-scale functional model introduced concept. obtained data show influence varying frequency, acceleration mass. Finally, commercially available integrated circuit voltage regulation tested. At 2 Hz 2.7 m s−2 maximal power output 2.1 mW was achieved.