An Enhanced Ultrasonic Frequency Closed-Loop Control System for Biological Decomposition

被引:0
|
作者
Shi, E. [1 ]
Hu, C. [1 ]
Xu, Y. S. [1 ]
机构
[1] Soochow Univ, Coll Phys Optoelect & Energy, Suzhou, Peoples R China
关键词
frequency tracking; DDS; PI control; biological decomposition;
D O I
暂无
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
Frequency automatic tracking is a main characteristic of ultrasonic power system, especially in the field of biological decomposition. In this paper, after analysing characteristics of multiple peaks of transducer, a reliable power control and frequency tracking strategy is introduced. It is based on an accurate and fast strategy of frequency tracking; by taking samples of the error of phase difference with small resistance method, two control strategies of DDS (Direct Digital Synthesizer) and PI (proportional-integral) adjustment associate with each other to reduce the error. Then the transducer array keeps an effective working state, the whole system realizes low distortion, variable resonance frequencies and adjustable amplitude. The system improves power factor and meets the needs for dealing with different kinds of biological samples.
引用
收藏
页码:47 / 51
页数:5
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