一种粘滑式直线压电驱动器控制电路设计

Design of Control Circuit for Stick-slip Linear Piezoelectric Actuator

针对粘滑式直线压电驱动器的控制问题,设计并实现了一种粘滑式直线压电驱动器控制电路,主要包括信号输入、增减计数器电路、光耦隔离电路、数模转换电路、差分放大电路、功率放大电路、信号输出。其中输入信号包括方向信号、时钟信号和使能信号;增减计数器电路接收信号输入,在时钟信号的上升沿进行计数,并将计数值生成四位二进制编码信号,经光耦隔离电路输出给数模转换电路;数模转换电路将四位二进制编码信号转换为相应的模拟电压信号,经差分放大电路减少噪声,功率放大电路进行功率放大后输出锯齿波给压电驱动器。为验证该压电驱动器控制电路的开环性能,使用光栅尺测量压电驱动器的运动速度,在不同锯齿波输出频率下进行频率-速度实验,实验证明了所设计的控制电路的有效性。

Aiming at the control problem of stick-slip linear piezoelectric actuator,a control circuit of stick-slip linear piezoelectric actuator was designed and implemented,which mainly included signal input,increase and decrease counter circuit,optocoupler isolation circuit,digital-analog conversion circuit,differential amplifier circuit,power amplifier circuit and signal output.The input signal included direction signal,clock signal and enable signal.The increase and decrease counter circuit received signal input,counted in the rising edge of the clock signal,and generated four binary coded signal,which was output to the digital-analog conversion circuit through the optocoupler isolation circuit.The digital-analog conversion circuit converted the four-bit binary coded signal into the corresponding analog voltage signal,reduced the noise by the differential amplifier circuit,and outputted the sawtooth wave to the piezoelectric driver after power amplification.In order to verify the open-loop performance of the piezoelectric actuator control circuit designed,a grating ruler was used to measure the movement speed of the piezoelectric actuator,and frequency-velocity experiments were carried out at different output frequencies of sawtooth wave,which proved the effectiveness of the control circuit.