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Piezoelectric Transducers的能量清除

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  Piezoelectric Transducers的能量清除

  微捕集,或能量清除,依赖于从微小而无处不在的环境能量中提取能量,如光、热、rf或振动。利用压电器件,振动能量可以提供低功率应用,如用于设备或结构监测的难以到达和维护的无线传感器。通过以下几个关键的设计考虑,工程师可以通过压电换能器的视差供电的应用,测量专业/谢维茨,和美迪科技和电源管理器件的线性化技术。

  与其他微采能相比,振动和运动是环境动力的相对可靠来源(图1)。例如,放在电机上,振动驱动的传感器可以在电机运行时准确地获得功率。在实际应用中,压电换能器可能被用来向高效率存储设备充电,而不是直接向应用电路供电。例如,一个典型的微收获可能包括一个专门设计的电池如在平静期或超级电容器如伊顿HB系列装置确保在高峰负荷期间,无线数据传输足够的电力储存电荷Cymbet EnerChip。

  Piezoelectric Transducers的能量清除

  Figure 1: Sources of vibration can serve as significant ambient energy sources. (Courtesy of Texas Instruments.)

  How it works

  Piezoelectric wafers are fabricated from a ceramic such as lead zirconate titanate (PZT) or fluoropolymer film such as polyvinylidene fluoride (PVDF)。 When subjected to mechanical forces that cause them to flex, these devices produce an ACvoltage proportional to the amplitude of the flexing movement. For use as vibration transducers, these materials are typically mounted in cantilevered structures, mounted to a fixed platform at one end and affixed with a tuning mass at the other (Figure 2)。 For example, the Parallax 605-00004, Measurement Specialties 0-1002794-0, and Mide Technology VR001 all are provided in their own variations of this basic cantilevered design.

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