浙江工商大学信息与电子工程学院（萨塞克斯人工智能学院）
浙江省教育厅一般科研项目资助(no. Y202352692)
School of Information and Electronic Engineering, Zhejiang Gongshang University (Sussex College of Artificial Intelligence)
Project Supported by Scientific Research Fund of Zhejiang Provincial Education Department (no. Y202352692).
驱动电路性能对微型压电超声波电机的稳定和高精度运行至关重要。针对1mm微型柱状压电超声波电机的低压驱动和高速运转要求，设计了一款基于数字信号处理器（Digital Signal Processing，DSP）28335芯片的逆变升压-推挽式驱动电路，该电路以DSP 28335芯片为核心产生四路脉冲宽度调制（Pulse Width Modulation，PWM）波，并驱动4个MOSFET开关管两两交替导通，通过变压器进行逆变升压和功率放大，再经过LC匹配电路后得到两相幅值相同、相位相差90°的正弦波，以驱动1mm超声波电动机旋转。针对驱动电路的硬件和软件设计流程作了详细分析和参数设计，仿真和实验结果表明，该驱动电路输出电压可调范围0-100V，频率可调范围15kHz-50kHz。压电超声波电机空载转速随电压的增大呈线性增大关系，在驱动频率和电压分别为22kHz和50V作用下，达到480rpm，满足1mm柱状压电超声波电机的驱动要求。
The performance of driving circuit is very important for the stable and high precision operation of micro piezoelectric ultrasonic motor. Aiming at the low voltage drive and high speed operation requirements of 1mm micro cylindrical piezoelectric ultrasonic motor, a transformer inverter booster push-pull drive circuit based on Digital Signal Processing (DSP) 28335 chip is designed. The circuit uses DSP 28335 chip as the core to generate four Pulse Width Modulation (PWM) waves. After the PWM wave drives the four MOSFET switch tubes in pairwise alternating conduction, the inverter voltage boost and power amplification are carried out through the transformer, and then the sinusoidal wave with the same amplitude and 90° phase difference is obtained after the LC matching circuit filtering to drive the 1mm ultrasonic motor to rotate. The detailed analysis and parameter design of the hardware and software of the drive circuit are made. The simulation and experiment results show that the output voltage of the drive circuit based on DSP 28335 chip can be adjusted in the range of 0-100V, and the frequency can be adjusted in the range of 15kHz-50kHz. The no-load speed of the piezoelectric ultrasonic motor increases linearly with the increase of the excitation voltage, and reaches 480rpm under the action of 22kHz and 50V respectively, which meets the driving requirements of 1mm cylindrical piezoelectric ultrasonic motor.
