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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Nonlinear interface between the piezoelectric harvesting structure and the modulating circuit of an energy harvester with a real storage battery
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Nonlinear interface between the piezoelectric harvesting structure and the modulating circuit of an energy harvester with a real storage battery

机译：带有真实蓄电池的能量采集器的压电采集结构和调制电路之间的非线性接口

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摘要

This paper studies the performance of an energy harvester with a piezoelectric bimorph (PB) and a real electrochemical battery (ECB), both are connected as an integrated system through a rectified dc-dc converter (DDC). A vibrating PB can scavenge energy from the operating environment by the electromechanical coupling. A DDC can effectively match the optimal output voltage of the harvesting structure to the battery voltage. To raise the output power density of PB, a synchronized switch harvesting inductor (SSHI) is used in parallel with the harvesting structure to reverse the voltage through charge transfer between the output electrodes at the transition moments from closed-to open-circuit. Voltage reversal results in earlier arrival of rectifier conduction because the output voltage phases of any two adjacent closed-circuit states are just opposite each other. In principle, a PB is with a smaller, flexural stiffness under closed-circuit condition than under open-circuit condition. Thus, the PB subjected to longer closed-circuit condition will be easier to be accelerated. A larger flexural velocity makes the PB to deflect with larger amplitude, which implies that more mechanical energy will be converted into an electric one. Nonlinear interface between the vibrating PB and the modulating circuit is analyzed in detail, and the effects of SSHI and DDC on the charging efficiency of the storage battery are researched numerically. It was found that the introduction of a DDC in the modulating circuit and an SSHI in the harvesting structure can raise the charging efficiency by several times.
机译：本文研究了带有压电双压电晶片（PB）和真正的电化学电池（ECB）的能量采集器的性能，两者均通过整流的DC-DC转换器（DDC）作为集成系统连接。振动的PB可以通过机电耦合从运行环境中清除能量。 DDC可以有效地将采集结构的最佳输出电压与电池电压匹配。为了提高PB的输出功率密度，同步开关收集电感器（SSHI）与收集结构并联使用，以在从闭合到开路的过渡时刻通过输出电极之间的电荷转移来反转电压。电压反转会导致整流器导通的更早到达，因为任何两个相邻闭路状态的输出电压相位都彼此相反。原则上，PB在闭路条件下的挠曲刚度要小于开路条件下的挠曲刚度。因此，经受更长的闭路条件的PB将更容易被加速。较大的弯曲速度使PB偏转的幅度更大，这意味着更多的机械能将转换为电能。详细分析了振动PB与调制电路之间的非线性界面，并数值研究了SSHI和DDC对蓄电池充电效率的影响。已经发现，在调制电路中引入DDC而在采集结构中引入SSHI可以使充电效率提高数倍。

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