| Summary: | 碩士 === 國立臺灣大學 === 應用力學研究所 === 106 === The thesis investigate the array of piezoelectric energy harvesting under rotational magnetic plucking used for energy harvesting, with an intention to improve the stability of power output and reduce ripples in the output frequency response.The first attempt is to choose the parallel connection of multiple piezoelectric oscillators attached to a single rectifier for overall electrical rectification. However, the result shows the significant power reduction due to serious charge cancellation by the different timing of magnetic plucking.Then, an array of piezoelectric oscillators attached to multiple rectifiers for respective electrical rectification is considered for avoiding phase difference. Through PSPICE circuit simulations and experimental validation, it is found the frequency response of an array with respective electrical rectification is the addition of that of each individual piezoelectric oscillator. Based on this observation, the ripples of power frequency response is expected to be reduced by carefully adjusting the local peak power of one oscillator corresponds to the local valley of power of another oscillator, and vice versa. It is found the experiment exhibits the 40%-50% reduction of ripples by the manipulation of circuit switch within the range of rotational frequency between 8-14 Hz, providing a stable voltage resource.
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