A Study of Parallel- and Series-SSHI Interfaces in Piezoelectric Energy Harvesting
Date Issued
2010
Date
2010
Author(s)
Shiu, Shr-Ming
Abstract
With the great advances in the integrated circuits, the power demand of mobile communication devices has been reduced significantly. Therefore, different forms of energy available in environment can be transformed into useful electric energy via suitable medium, and the notion of energy harvesting for producing enough power is not far fetched. The present thesis investigates the effect of the synchronized switch harvesting on inductor (SSHI) interface on power optimization in vibration-based piezoelectric energy harvesting systems. The results are also compared to those achieved based on the standard electronic interface. They show that SSHI techniques can not only boost harvested power, but also enhance the bandwidth of a power generator with medium electromechanical coupling.
Besides, it is also found that the effective electromechanical coupling of a Parallel-SSHI system increases significantly due to the elimination of parasitic piezoelectric capacitance. Different from the parallel SSHI technique operated at around the short circuit resonance, Series-SSHI is effectively operated at the open circuit resonance by releasing transient energy to electric load. As a result, the electrical response of an ideal Series-SSHI system is in conjugate with that of an ideal Parallel-SSHI system. Finally, our numerous experimental results reveal that the consideration of inevitable diode loss favors the Parallel-SSHI technique, since the frequency-insensitive feature is much more pronounced in Parallel-SSHI systems than in Series-SSHI systems.
Subjects
Piezoelectric Energy Harvesting
SSHI Interface
Wideband Effect
Type
thesis
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