Numerical Investigation of Mechanically and Electrically Switching SSHI in Highly Coupled Piezoelectric Vibration Energy Harvester
Numerical Investigation of Mechanically and Electrically Switching SSHI in Highly Coupled Piezoelectric Vibration Energy Harvester
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DOI：
10.1088/1742-6596/1052/1/012073
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发表时间：
2018-07
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影响因子：
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通讯作者：
K. Sakamoto;H. Asanuma;T. Komatsuzaki;Y. Iwata
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文献类型：
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作者：
K. Sakamoto;H. Asanuma;T. Komatsuzaki;Y. Iwata
为了提高压电振动能量采集器的输出功率，利用电子或机械开关的电感自供电同步开关采集（SSHI）备受关注。然而，对于自供电sshi，这两种开关技术的优缺点尚不清楚。此外，对于高机电耦合系数k的收割机，由于SSHI电压的升高，压电阻尼力的增强可能会减小收割机的位移，从而降低输出功率。采用仿真技术，在考虑压电阻尼力反馈的情况下，对电气开关SSHI （ESS）和机械开关SSHI （MSS）收割机的性能进行了数值研究。数值研究表明，在最大/最小位移处，压电阻尼力的作用减小了每次导通的位移，从而降低了输出功率。相比之下，仅当位移超过间隙距离时开关才打开的MSS获得了更高的输出功率，并且呈现出输出功率持续增加而位移保持不变的有趣现象。因此，对于高k的收割机，MSS可以超过ESS。
In aiming to increase output power for piezoelectric vibration energy harvesters, a self-powered synchronized switch harvesting on inductor (SSHI) using an electrical or mechanical switch has considerable attention. However, the advantages and disadvantages of the two switching technique for the self-powered SSHIs remains unclear. In addition, for a harvester with a high electromechanical coupling coefficient k, the piezoelectric damping force, which enhances by the SSHI’s voltage increase, is likely to reduce the harvester’s displacement and thus lower the output power. We developed simulation technique, and numerically investigated the performance for the electrical switch SSHI (ESS) and for the mechanical switch SSHI (MSS) harvester, considering the feedback of the piezoelectric damping force. The numerical investigation revealed that, for the ESS, the piezoelectric damping force reduces the displacement every switching on at the maximum/minimum displacement, and thus lowers the output power. In contrast, the MSS, in which the switch turns on only when the displacement exceeds the gap distance, achieved a higher output power, and exhibited intriguing phenomena that the output power continues to increase, whereas the displacement is held constant. Therefore, for a harvester with high k, the MSS can outweigh the ESS.