压电马达需高压交流信号进行驱动，传统的驱动电路通过电感与马达构成谐振升压电路产生高压。分析指出了传统电路缺点在于谐振电路的输出信号不均衡且不稳定，而且需逐个微调马达对应的匹配电感。基于短时工作、轻载荷的应用环境，针对上述缺点提出了多级升压方案。新的方案减轻了谐振升压电路的压力。电感主要作用转变为调节电路功率因数。因此两相输出信号变得平稳、均衡，且无需微调电感，调试过程得以精简，利于批量生产。试验数据表明电路可输出±260 V的交流信号，驱动 Ф11 mm行波压电马达正常工作，转速约 600 RPM。

Ultrasonic Motor(abbr.USM) is driven by high voltage AC signal from driving circuit. The traditional driving circuit generates high voltage output signals by resonance between inductor and USM. Analysis points out that defects of traditional driving circuit are the unstability of output signal and low efficiency during preliminary test. An improved driving method named multilevel stepping-up is presented toward these problems. The stepping-up pressure of LC circuit is released. The working condition of LC resonant circuit is improved and the main function of inductor changes from resonating to adjusting the power factor. It is no need to adjust inductor during test and the efficiency is improved. Experiment result shows that the voltage of the output signal of the improved method can be as high as ±260 Vpp，and Ф11 mm motor runs well at about 600 RPM by the driving of the improved circuit.