新型超声发生器中锁相环的研究

Study on phase locking ring in new ultrasonic generator

目的通过锁相环技术,对换能器产生的谐振频率进行跟踪,以便使换能器可以在谐振状态下正常、稳定的工作。方法基于相位差的跟踪方法,使采样电压与采样电流经过相位检测电路的检测、比对、整形,使采样信号的相位同位,相位差为零。结果本文设计的检测电路利用示波器实时监测,电压、电流信号同相位,实现频率自动跟踪功能。结论整个系统设计简单、性能稳定,可以应用于低频超声设备的频率自动跟踪系统中。

Objective Track the resonance frequency of the transducer by using the technique of phase lock loop to make the transducer work normally and stably in the resonant state. Methods Based on the tracking method of phase difference,the sampling voltage and sampling current are measured,compared,and shaped by the phase detection circuit to assure the phase of the sampling signal in the same position,and the phase difference to be zero. Results The detection circuit designed in this work uses the oscilloscope to detect the voltage current signal in real time,and the voltage current signal is in the same phase to realize the frequency automatic tracking function. Conclusion The system design is simple and stable,and can be applied to the frequency automatic tracking system of low frequency ultrasonic equipment.