Graduate Seminar

When

October 29, 2014    
1:10 pm - 2:00 pm

Where

3043 ECpE Building Addition
Coover Hall, Ames, Iowa, 50011

Event Type

Title: Piezoelectric-based broadband bistable vibration energy harvester and SCE/SSHI-based high power extraction

Speaker: Kanishka Aman Singh

Advisor: Ratnesh Kumar, Professor; Robert Weber, Professor Emeritus

Abstract: This work presents a nonlinear vibration energy harvester, which combines a nonlinear bistable broadband piezoelectric cantilever used to transduce ambient vibration energy, with synchronized capture for efficient harvesting over broadband sources. An accurate model of the bistable transducer, that augments the Butterworth van Dyke model to capture the external magnetic force added as a bias to the external vibrations, is presented. Its validity has been demonstrated through physical implementation and experimental validation against simulation of the mathematical model. For efficient extraction of the transduced energy, nonlinear extraction circuits, namely synchronous charge extraction (SCE) and parallel synchronized switch harvesting on inductor (SSHI), are employed. The switching in these circuits is implemented using a fully self-propelled, low-power electronic breaker circuit, capable of detecting extrema in the waveform to perform switching. Both simulated and experimental power outputs from the bistable harvester have been presented, with the SCE and parallel-SSHI providing average outputs with more than 100 fold increase over the harvested power reported in literature for the same input, and further, even more significant gains are observed for broadband excitations.

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