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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Efficient charge recovery method for driving piezoelectric actuators with quasi-square waves
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Efficient charge recovery method for driving piezoelectric actuators with quasi-square waves

机译：用准方波驱动压电致动器的高效电荷恢复方法

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摘要

In this paper, an efficient charge recovery method for driving piezoelectric actuators with low frequency square waves in low-power applications such as mobile microrobots is investigated. Efficiency issues related to periodic mechanical work of the actuators and the relationship among the driving electronics efficiency, the piezoelectric coupling factor, and the actuator energy transmission coefficient are discussed. The proposed charge recovery method exploiting the energy transfer between an inductor and a general capacitive load is compared with existing techniques that lead to inherent inefficiencies. A charge recovery method is then applied to piezoelectric actuators, especially to bimorph ones. Unitary efficiency can be obtained theoretically for purely capacitive loads while intrinsic losses such as hysteresis necessarily lower the efficiency. In order to show the validity of the method, a prototype driving electronics consisting of an extended H-bridge is constructed and tested by experiments and simulations. Preliminary results show that 75% of charge (i.e., more than 56% of energy) can be recovered for bending actuators such as bimorphs without any component optimization at low fields.
机译：在本文中，研究了一种有效的电荷恢复方法，用于在低功率应用（如移动微型机器人）中驱动具有低频方波的压电致动器。讨论了与执行器的周期性机械功有关的效率问题，以及驱动电子效率，压电耦合系数和执行器能量传输系数之间的关系。将提出的利用电感器和一般电容性负载之间的能量转移的电荷恢复方法与导致固有效率低下的现有技术进行比较。然后将电荷恢复方法应用于压电致动器，尤其是双压电晶片致动器。理论上，对于纯容性负载，可以得到单位效率，而固有损耗（例如磁滞）必然会降低效率。为了证明该方法的有效性，构建了由扩展H桥组成的原型驱动电子设备，并通过实验和仿真进行了测试。初步结果表明，对于弯曲致动器（如双压电晶片），无需在低场进行任何组件优化，就可以回收75％的电荷（即超过56％的能量）。

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