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超声换能器并联谐振频率的复合式跟踪方法研究
引用本文:刘丽晨,杨明,李世阳,庄晓奇,李奇磊.超声换能器并联谐振频率的复合式跟踪方法研究[J].应用声学,2015,34(1):45-50.
作者姓名:刘丽晨  杨明  李世阳  庄晓奇  李奇磊
作者单位:上海交通大学仪器科学与工程系 上海 200240,上海交通大学仪器科学与工程系 上海 200240,上海交通大学仪器科学与工程系 上海 200240,上海交通大学仪器科学与工程系 上海 200240,上海交通大学仪器科学与工程系 上海 200240
基金项目:(51275287);国家自然科学基金项目(面上项目,重点项目,重大项目)
摘    要:为了使超声换能器适应变化比较剧烈的负载,本文通过分析超声换能器在并联谐振频率附近工作时的频率特性和实际需求特点,利用变压器初级匹配方法得到了更好的频率特性,并对比了换能器空载和带负荷情况下的阻抗特性曲线,提出了复合式自动频率跟踪方法,空载时找到超声换能器最小电流的对应的频率点,加载过程中利用比例积分微分算法实现频率的快速跟踪。并对超声换能器在不同负载时的功率输出进行了实验,结果表明,复合式频率跟踪方法可以稳定地跟踪到超声换能器的并联谐振频率,能实现超声换能器的功率自调节,对提高换能器的工作效率和负荷适应能力具有实际的指导意义和应用价值。

关 键 词:复合式跟踪  并联谐振频率  变压器初级匹配  比例积分微分算法
收稿时间:4/1/2014 12:00:00 AM
修稿时间:2014/12/26 0:00:00

Parallel resonant frequency composite tracking of piezoelectric transducer
Liu Lichen,Yang Ming,Li Shiyang,Zhuang Xiaoqi and Li Qilei.Parallel resonant frequency composite tracking of piezoelectric transducer[J].Applied Acoustics,2015,34(1):45-50.
Authors:Liu Lichen  Yang Ming  Li Shiyang  Zhuang Xiaoqi and Li Qilei
Institution:1. Department of Instrument Science and Engineering,Shanghai Jiaotong University,1. Department of Instrument Science and Engineering,Shanghai Jiaotong University,1. Department of Instrument Science and Engineering,Shanghai Jiaotong University,1. Department of Instrument Science and Engineering,Shanghai Jiaotong University,1. Department of Instrument Science and Engineering,Shanghai Jiaotong University
Abstract:By analyzing the frequency characteristics of ultrasonic welding transducer near its parallel resonant frequency and the practical demand, a primary matching is developed to get a better frequency characteristic. Then, comparisons about the transducer impedance curve between on load and no-load are made. The composite tracking strategy is presented, that is, the frequency is found when the transducer has no load and is tracked with the PID algorithm when it has load. An experiment about the output power of ultrasonic welding transducer under different load is made. The research result shows the tracking method can track the parallel resonance frequency of ultrasonic transducer stably and reflects the characteristics of ultrasonic transducer automatic power adjustment, it has practical significance and application value for ultrasonic transducer to improve the efficiency and adaptability.
Keywords:Composite tracking  Parallel resonance frequency  Transformer primary matching    PID algorithm
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