一种可编程的超声电机半桥驱动电路

A programmable ultrasonic motor half-bridge driving circuit

基于超声电机工作的逆压电效应,设计了一种体积小、精度高的超声电机半桥驱动电路。采用FPGA产生两相可调方波信号,将其输入半桥控制模块。利用该模块的LM5106集成芯片产生具有死区时间的四路方波信号用于驱动两个半桥,半桥的两路输出信号通过匹配滤波后驱动超声电机工作。为达到超声电机工作电压幅值要求,采用Boost升压电路为半桥供电。实验结果表明,设计出的电路可产生频率、相位差、占空比可精确调节的两相信号,满足额定工作电压为40~80 V的超声电机的驱动要求。

This paper designs a small, high precision half-bridge driving circuit based on the inverse piezoelectric effect of ultrasonic motor. Two-phase adjustable square-wave signal are generated by a FPGA, which acts as input signal into half-bridge control module. The integrated chip LMS106 in this module outputs four channel square-ware signals possessed with dead time to drive two half-bridges, whose output signal drives ultrasonic motor through the matched filter. To meet the amplitude requirement of ultrasonic motor＇s working voltage, a boost circuit is used as the supply of half-bridge circuit. The results we obtained demonstrate that the whole circuit generates two signals whose frequencies, phase difference and duty ratios are precisely adjustable, that meets the driving requirement of ultrasonic motor whose rated working voltage is 40-80 V.