A Charge Controller for Synchronous Linear Operation of Multiple Piezoelectric Actuators

Tao Jin,Zhiming Xing,Lihua Lei,Yang Peng

doi:10.1109/access.2019.2927411

Abstract

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.

Highlights

Piezoelectric ceramics are electronic components that directly convert voltage into micro-displacement
A similarity-base feedback control scheme reduces the position error to 0.3% of the travel range [20], which uses two piezoelectric actuators. Based on this we propose a multi-piezoelectric charge controller (MPCC) that can be used for synchronous linear operation of multiple actuators
EXPERIMENTAL RESULTS AND DISCUSSION This section covers the design of nonlinear charge controller performance results and the actual situation of the MPCC controlling two piezoelectric actuators

Summary

INTRODUCTION

Piezoelectric ceramics are electronic components that directly convert voltage into micro-displacement. To cope with this challenge, Fleming and Moheimani proposed a charge controller with a grounded configuration [16] and used it in an AFM [17] This method requires a high-performance differential amplifier. A similarity-base feedback control scheme reduces the position error to 0.3% of the travel range [20], which uses two piezoelectric actuators Based on this we propose a multi-piezoelectric charge controller (MPCC) that can be used for synchronous linear operation of multiple actuators. The scheme achieves high linearity open-loop control of a plurality of piezoelectric actuators by the principle of similar control This solution is simpler than the Fleming solution in the ground configuration and does not require a high performance differential amplifier.

TYPICAL PIEZOELECTRIC CHARGE CONTROLLER

EXPERIMENTAL IMPLEMENTATION AND CONTROLLER DESIGN

EXPERIMENTAL RESULTS AND DISCUSSION

CONCLUSION AND FUTURE WORK