CURRENT CONTROL AMPLIFIER FOR PIEZOELECTRIC ACTUATOR IN PRECISION POSITIONING CONTROL

摘要

Piezoelectric transducers are known to exhibit less hysterisis when driven with current or charge rather than voltage. Despite this advantage, such methods have found little practical application due to the poor low frequency response of present current and charge driver designs. In this paper, a current control piezoelectric amplifier is presented which can reduce hysteresis. Special circuits and a hybrid control algorithm realize the quick and precise positioning. Experimental results demonstrate that the amplifier can be used for dynamic and static applications. Low frequency bandwidths can be achieved.