摘  要：介绍了基于相移PWM的超声波电机H桥控制电路结构，给出了控制电路的一种低成本实现方法，分析了其组成和工作原理。在此基础上，从电路效率、变压器输出电压谐波、电机端电压幅值控制线性度等方面，分析了相移PWMH桥电路与目前常用的推挽式电路的性能差异。经实验验证，该控制电路工作效果良好。
关键词：超声波电机；控制电路；相移PWM；H桥；实验

Abstract: The ultrasonic motor‘s H-bridge control circuit based on phase-shift PWM technology was introduced in this paper.A low-cost implementary circuit of the phase-shift PWM signal generator was designed and analyzed.The experimental results proved that,the design was correct.On the basis of the new designed circuit,the difference of performances between the phase-shift H-bridge circuit and push-pull circuit was analyzed.
Key Words: Ultrasonic motor；Control circuit；Phase-shift PWM；H bridge;Experiment