为了解决换能器在工作过程中谐振频率漂移的问题,对换能器的等效电路模型以及匹配网络进行了研究,分析了换能器谐振点的特性,提出了一种基于双路电流信号的谐振频率跟踪的控制方法.该方法通过采样两路电流信号的有效值以及相位,计算出系统状态,并通过变步长控制对电源输出电压频率进行调整.利用示波器检测系统的追踪效果,实验结果表明,基于该方法设计的超声波电源能够在负载动态变化时快速对频率跟踪,且跟踪精度达到1 Hz.
Research and Design of Ultrasonic Power Supply for Frequency Tracking
In order to solve the problem of resonant frequency drift during the operation of the transducer,the circuit model and matching network of the transducer are studied,and the characteristics of the resonant point of the transducer are analyzed.A control method based on dual current signals for resonant frequency tracking is proposed.This method calculates the system state by sampling the effective value and phase of two current signals,and adjusts the output voltage frequency of the power supply through variable step control.By using an oscilloscope to detect the tracking effect of the system,the experimental results show that the ultra-sonic power supply designed based on this method can quickly track frequency when the load changes dynamically,and the tracking accuracy reaches 1 Hz.
ultrasonic power supplyfrequency trackingvariable step size control
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