Literature has shown that the bandwidth of a piezoelectric energy harvesting (PEH) system can be effectively broadened by introducing nonlinear mechanical dynamics. However, when connected to a practical PEH interface circuit for ac-to-dc conversion, the bandwidth improvement will be impaired because of the electrically induced damping effect. On the other hand, there is another bandwidth broadening solution, in which the resonant frequency is tunable to some extent by carrying out the phase-variable synchronized switch (PVSS) control in practical interface circuits. This Letter reports a synergistic design by combining these two mechanisms toward a dual-effect broadband PEH solution. The theoretical model of this nonlinear and electromechanically coupled system is derived. The experimental result shows that, by introducing the PVSS control to a PEH system, which is composed of a monostable piezoelectric cantilever beam and a practical synchronized switch interface circuit, its bandwidth can be broadened by 18.7%. This dual-effect solution incorporates two bandwidth broadening mechanisms toward practical broadband PEH systems.

中文翻译：

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宽带压电能量收集的双效解决方案

文献表明，通过引入非线性机械动力学，可以有效拓宽压电能量收集 (PEH) 系统的带宽。然而，当连接到实际的 PEH 接口电路以进行 AC-DC 转换时，由于电感应阻尼效应，带宽改善将受到损害。另一方面，还有另一种带宽加宽的解决方案，通过在实际接口电路中进行相位可变同步开关（PVSS）控制，可以在一定程度上调整谐振频率。这封信报告了通过将这两种机制结合起来实现双效宽带 PEH 解决方案的协同设计。推导出了这种非线性机电耦合系统的理论模型。实验结果表明，通过将 PVSS 控制引入到由单稳态压电悬臂梁和实用的同步开关接口电路组成的 PEH 系统中，其带宽可以扩大 18.7%。这种双效解决方案结合了两种带宽扩展机制，以实现实用的宽带 PEH 系统。