A Charge Controller for Synchronous Linear Operation of Multiple Piezoelectric Actuators

The charge controller can greatly improve the hysteresis of the piezoceramic without the sensor. It is widely used in open-loop controlled nano-positioning systems. However, conventional charge controllers are not suitable for synchronous high linear operation of multiple piezoelectric actuators. This paper proposes a novel charge control scheme which can be used for synchronous high linear operation of multiple piezoelectric actuators. The control scheme combines similar control and traditional charge control. We verify the feasibility of this control scheme through experiments. The trajectory deviation between the two piezoelectric actuators reaches 0.79% of the travel range, while their respective trajectory errors do not exceed 1.2%. Because the controller in this paper has a simpler grounding configuration, it can also replace the traditional charge controllers for high linearity operation. The experimental results show that the charge controller achieves 0.65% positioning error of the piezoelectric actuator with grounding configuration. In addition, a T-type resistor network has also been introduced into the charge controller, which enables low-frequency linear operation of piezoelectric actuators with small capacitance.