基于变参数PI-ADPLL超声焊接电源的频率跟踪控制  

Frequency tracking control system in inverter ultrasonic welding power supply based on variable arguments PI-ADPLL

作　　者：汪义旺[1] 汪晓东[2] 车保川[3] 

机构地区：[1]苏州市职业大学电子信息工程系,江苏苏州215104 [2]环宇集团有限公司,浙江温州325603 [3]常州市广播电视大学信息与工程系,江苏常州213001

出　　处：《电焊机》2009年第12期89-91,共3页Electric Welding Machine

摘　　要：在超声波焊接过程中,由于焊接负载和振动系统温度等的变化使系统固有频率发生漂移,振幅脱离谐振状态。针对这一缺点,采用数字信号处理DSP技术,研究了一种基于变参数PI与全数字锁相环ADPLL相结合的超声焊接电源频率复合跟踪控制策略,即当频率的误差值大于或等于偏差设定的阀值时,采用变参数PI控制,快速准确地将电源工作频率引入锁相范围;当频率误差值小于偏差设定的阀值时,采用ADPLL控制,使超声焊接电源的工作频率精确跟踪换能器的谐振频率。试验结果表明,基于变参数PI-ADPLL控制的超声焊接电源具有频率跟踪性能好、响应速度快、工作效率高等优点。During the process of ultrasonic welding,the resonant frequency of ultrasonic transducer may drift,to overe.ome those disadvantages in frequency system of conventional inverter ultrasonic welding power supply,bsed on digital signal process （DSP） control technology,a all digital phase-locked loop （ADPLL） technique in cooperated with variable argument Pl controller is put forward in this paper,when system working frequency error is greater than or equal to the preseted threshold,only ratable arguments Pl controller is utilized to pull rapidly the operating frequency into phase locking range.Otherwise the output frequency or phase of the inverter is controlled only by the ADPLL when the error is smaller,which controll of working frequency uhrasonie welding power supply by accurately tracking resonance frequency of the system.The experimental results proved that the developed uhrasonic welding power supply can realize quickly and accurately frequency tracking,also has fast dynamic response and high steady precision.

关 键 词：超声焊接 频率跟踪 变参数PI 全数字锁相环ADPLL 

分 类 号：TG409[金属学及工艺—焊接]