中文摘要：

提出了一种具有变频功能的压电俘能器，它由多个不同长度的压电双晶片组成．分别讨论了各晶片序列的串联与并联对俘能行为的影响．数值计算结果表明，俘能器的工作频率带得到了明显的拓宽，工作频率带的位置可以通过改变控制开关的开闭状态来改变并联分支个数，从而移动到指定的频率区域上．该俘能器能更加有效地从变频及多频环境振动源中提取能量来给微电子器件供能．

英文摘要：

A novel approach to design broadband piezoelectric harvesters with adjustable operating frequency-band （OFB） was presented, which could effectively absorb the energy from environment vibration source with varying frequency. Multiple piezoelectric bimorphs （PB） with different lengths were integrated into a harvesting system. Effects of two connecting patterns among PB, in series and in parallel, on improving energy harvesting performance were discussed. Compared with traditional energy harvesters, numerical results show that the OFB of the energy harvester is widened; the OFB of the energy harvester can be shifted to the dominant frequency domain of the ambient vibrations by increasing or decreasing the number of PB in parallel.