开关电容电荷泵可在很宽的频率范围内降低压电致动器的滞后现象。

Switched capacitor charge pump reduces hysteresis of piezoelectric actuators over a large frequency range.

作者信息

Huang Liang, Ma Yu Ting, Feng Zhi Hua, Kong Fan Rang

机构信息

Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230026, China.

出版信息

Rev Sci Instrum. 2010 Sep;81(9):094701. doi: 10.1063/1.3477997.

DOI:10.1063/1.3477997

PMID:20886997

Abstract

Piezoelectric actuators exhibit large hysteresis between the applied voltage and their displacement. A switched capacitor charge pump is proposed to reduce hysteresis and linearize the movement of piezoelectric actuators. By pumping the same amount of charges into the piezoelectric actuator quantitatively, the actuator will be forced to change its length with constant step. Compared with traditional voltage and charge driving, experimental results demonstrated that the piezoelectric stack driven by the charge pump had less hysteresis over a large frequency range, especially at ultralow frequencies. A hysteresis of less than 2.01% was achieved over a frequency range of 0.01-20 Hz using the charge pump driver.

摘要

压电致动器在施加电压与其位移之间表现出较大的滞后现象。提出了一种开关电容电荷泵来减少滞后并使压电致动器的运动线性化。通过定量地向压电致动器泵入相同数量的电荷，致动器将被迫以恒定步长改变其长度。与传统的电压驱动和电荷驱动相比，实验结果表明，由电荷泵驱动的压电叠堆在较宽的频率范围内具有较小的滞后，尤其是在超低频时。使用电荷泵驱动器在0.01 - 20 Hz的频率范围内实现了小于2.01%的滞后。