【作者】 徐韶华； 熊显名；

【Author】 Xu Shaohua Xiong Xianming(School of Electronic Engineering Guilin University of Electronic Technology Guilin 541004 China)

【机构】 桂林电子科技大学电子工程学院；

【摘要】 在功率超声设备中,换能器的谐振频率在工作过程中通常会发生改变。为了解决换能器的频率漂移问题,获得最佳的电声效率,本文介绍了一种基于DDS(Direct Digital Synthesize)的频率自动跟踪超声波发生器的研制。本设计通过控制超声换能器工作电流的实时反馈,及时控制DDS的输出频率,使超声换能器时刻工作在高工作效率点上。本文详细说明了DDS信号的产生电路、功率放大电路、匹配电路、以及电流反馈电路和单片机控制电路的设计,并且给出了相应的程序流程图。目前,该设备已投入到工业应用中。更多还原

【Abstract】 In the power ultrasonic equipment,transducer’s resonant frequency has often been changed in the working process.In order to solve the problem of frequency drift in the transducer,and to obtain the best electroacoustic efficiency,this paper introduces the development of an ultrasonic generator with frequency auto-tracing based on DDS(Direct Digital Synthesize).This design can control the output frequency of DDS real-timely by controlling the feedback of ultrasonic transducer’s working current,so that the ultrasonic transducer can work at the high-efficiency point at all times.This article details the DDS signal generation circuit,the power amplification circuit,the matching circuit,as well as the current feedback controlling circuit and the MCU controlling circuit,and gives the corresponding process flow chart.At present,the device has been put into industrial application.更多还原