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Effects of electrical loads containing non-resistive components on piezoelectric energy harvesting

机译：包含非电阻成分的电负载对压电能量收集的影响

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摘要

This study investigates the fundamental effects of electrical loads containing non-resistive components (e.g., rectifiers and capacitors) on piezoelectric energy harvesting performance. Theoretical, numerical and experimental studies have been carried out to investigate three types of electrical loads, namely (I) a rectifier followed by a resistor, (II) a rectifier followed by a regulating capacitor and a resistor, and (III) a simple charging circuit consisting of a rectifier and a capacitor. It is shown that device performance based on pure-resistive loads cannot be generalized to applications involving non-resistive components, i.e., rectifiers and capacitors. Results from cases (I) and (II) show that the rectifier voltage drop leads to a decrease in the power delivered to the load resistance and to an increase in the natural frequency of the device but does not change the optimal resistance corresponding to a driving frequency. The regulating capacitor, however, results in increases in both the optimal load resistance and the natural frequency of the device. Therefore, tuning the natural frequency of a piezoelectric device is possible through an adjustable regulating capacitor with an appropriate rectifier. From case (III), it has been found that a larger storing capacitor, with a low rectifier voltage drop, improves the piezoelectric energy harvesting performance.
机译：这项研究调查了包含非电阻性组件（例如整流器和电容器）的电负载对压电能量收集性能的基本影响。已经进行了理论，数值和实验研究，以研究三种类型的电负载，即（I）整流器后接电阻器（II）整流器后接调节电容器和电阻器，以及（III）简单充电由整流器和电容器组成的电路。结果表明，基于纯电阻负载的设备性能不能推广到涉及非电阻组件（即整流器和电容器）的应用。情况（I）和（II）的结果表明，整流器的电压降会导致传递给负载电阻的功率下降，并导致设备的固有频率增加，但不会改变与驱动相对应的最佳电阻频率。但是，调节电容器会导致最佳负载电阻和设备固有频率的增加。因此，可以通过带有适当整流器的可调调节电容器来调节压电器件的固有频率。从情况（III）发现，较大的存储电容器具有较低的整流器电压降，可改善压电能量收集性能。

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