Abstract
In this paper, based on the principles of general operational amplifiers, a high-voltage operational amplifier is developed. Considering the influences of piezoelectric stack actuators on the circuit, a novel structure using the high-voltage operational amplifier as a noninverting amplifier is proposed. Because of the simple circuit principles and the voltage feedback control structure, the proposed power amplifier has the advantages of low noise and small size, and it can be realized by discrete electric elements easily. In the application of precision positioning, a power amplifier using the proposed circuit principles for driving piezoelectric stack actuators is designed, simulated, and tested. The simulated results show that the proposed power amplifier could conform to the theory of the circuit. The experimental results show that the designed power amplifier conforms to the simulation, the bandwidth of the power amplifier is about 57 kHz, and the ripple of the power amplifier is less than 2 mV. Furthermore, the output of the proposed power amplifier maintains the same type of wave within in a large range of frequency, while the input is the sinusoidal or square wave, and the resolution of the mechanism which the power amplifier is applied in is about 4.5 nm. By selecting the critical electronic elements and using feedback control, the proposed circuit structure is able to realize a low-cost and high-performance power amplifier to drive piezoelectric stack actuators flexibly, which is the novel work of the paper.
Highlights
Piezoelectric stack actuators have been widely used in robotics, scanning probe microscopies, industrial precision positioning systems, and biomedical engineering because of their small size, high displacement resolution, and lack of electromagnetic interference [1,2,3,4,5,6,7,8]
Because voltage amplifiers have the advantages of simple structure and high bandwidth, they have been widely adopted for commercial power amplifiers [13,15]
When applying the high-voltage operational amplifier to form a power amplifier, it is general to use feedback control, so that the magnification of power amplifiers is determined by the feedback network and and the the value value of of the the magnification magnification is is constant constant during during the the designed designed frequency frequency range
Summary
Piezoelectric stack actuators have been widely used in robotics, scanning probe microscopies, industrial precision positioning systems, and biomedical engineering because of their small size, high displacement resolution, and lack of electromagnetic interference [1,2,3,4,5,6,7,8] In these applications, power amplifiers are important subsystems, and low-noise and high-voltage power amplifiers are needed to achieve the performance of piezoelectric stack actuators. Because voltage amplifiers have the advantages of simple structure and high bandwidth, they have been widely adopted for commercial power amplifiers [13,15] Many such voltage amplifiers have been proposed by References [16,17,18,19,20,21,22,23], and the power amplifier can be used to estimate the force and displacement of the piezoelectric stack actuator [24].
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