A dual-stage low-power converter driving for piezoelectric actuator applied in micro robot

Abstract

In this article, a dual-stage converter driving for a piezoelectric actuator based on flyback circuit was designed and implemented, which could be applied in a micro robot. A low-voltage direct current could be converted to a high-voltage alternating current through flyback circuit and direct current/alternating current circuit in low-power condition. In the direct current/direct current stage, the charging and discharging process was realized to generate a high voltage bias from a low voltage directly supplied by battery. Then, the high voltage was converted into alternating waveform by an energy recovery circuit in direct current/alternating current stage. Experiments were conducted to verify the ability of the proposed converter to drive a 100-V-input piezoelectric bimorph actuator using a prototype 108 mg (excluding printed circuit board mass), 169 (13 Â 13) mm 2 , and 500-mW converter. According to the experimental results, this converter could be used for driving piezoelectric actuator applied in micro robot.

Finite Element Modeling and Test of Piezo Disk with Local Ring Electrodes for Micro Displacement

“…Such actuators can convert electrical energy into mechanical energy under an electric field and produce precision mechanical displacement [1][2][3]. High precision micro-drive and micro-positioning technology are needed in the technical fields of optical engineering [4], microelectronic manufacturing [5], aerospace [6], ultra-precision manufacturing [7], micro-robotics [8,9], medicine and genetic engineering [10,11]. Precision actuators with a piezoelectric component as the core show micro/nano displacement resolution.…”

Hysteresis modelling and compensation for piezoelectric actuator using Jaya-BP neural network

“…Piezoelectric actuators directly convert electrical energy into a displacement with high accuracy, large generating force, and high response speed. These actuators are widely used as a high precision micropositioning stage in numerous applications, such as micro-gripper, 1 fluid control valve, 2 MEMs, 3 microrobotics, 4 etc. Unfortunately, the nonlinear hysteresis of the piezoelectric actuators can greatly degrade the positioning accuracy of micro-positioning systems.…”