【作者】 刘金涛；

【导师】 贾贵玺；

【作者基本信息】 天津大学 ， 电力电子与电力传动， 2005， 硕士

【摘要】 焊接是现代工业生产中不可或缺的加工方法,而弧焊电源是决定焊接质量的关键因素。逆变弧焊电源是近年来发展起来的一种小型、轻量、高效、节能的弧焊电源。模糊控制方法以其适用范围广,控制精度高等特点已广泛应用于生产的各个领域,随着微机技术的发展,将其应用于弧焊电源已经成为可能。本课题以研究出性能优越、经济实用的逆变弧焊电源为目的,将最新的软开关逆变技术和先进的模糊控制方式结合起来应用于弧焊电源的设计之中。本课题研究的主要内容是基于模糊控制的软开关式逆变弧焊电源的设计,在分析了全桥零电压逆变主电路的运行规律的基础上,详细介绍了主电路的设计方案,包括功率器件的选择、保护以及高频变压器的设计等;本课题采用集成化的微机控制,以89C58单片机为核心器件设计了系统的硬件电路,采用移相PWM控制方式实现逆变器的软开关,所采用的闭环反馈和模糊控制实现了电源的恒流输出,为提高控制系统的可靠性及抗干扰性能,本文采取了一系列有效的措施;按照弧焊电源所需实现的功能要求,本文开发了组成系统控制软件的主程序、中断服务程序及其它一些功能程序,并详细介绍了新型逆变弧焊电源的控制核心——模糊控制器的设计过程。在系统软硬件设计完成后,对整个电源进行了功能调试,并进行了外特性和温升测试以及焊接实验验证,实验的结果表明本课题所设计的弧焊电源应用模糊控制方法实现了弧焊电源所需的功能,该逆变弧焊电源的输出具有很高的稳定性和良好的动态性能。更多还原

【Abstract】 Weld is an important method in process, welding power is the key factor whichdetermines the quality of weld. Inverter welding power has developed rapidly becauseof its advantages such as high efficiency, energy saving, small bulk, light weight andmultifunction etc. Fuzzy control has been applied in many fields, with thedevelopment of microcomputer technology, it becomes realiable to use fuzzy controlin welding power. The purpose of this subject is to develop high performance,economical and practical welding power, the newest soft-switch invert technology andadvanced fuzzy control method combined to design welding power.The main content of this subject is to design a full-bridge shift-phase inverterwelding power with fuzzy controller, in the base of analyzing the running principle offull-bridge zero-voltage-switch inverter. The design of main circuit is introduced indetail. This design includes the selection and protection of elements, the designmethod and calculation of high frequency transformer. In this subject, the low costand integrated microcomputer are applied. The hardware circuit of this welding poweris designed based on Philips’s 89C58 single chip computer. In order to realize the softswitch of inverter, the shift-phase PWM control method is adopted. The weldingcurrent closed loop feedback control and fuzzy control systems are applied to gain theconstant welding current external characteristics. Many anti-jamming measures areused to protect the reliability of control system. According to the functions of thewelding power, the software is developed which includes main program, interruptservice routines and some function subprograms. The design of two input and singleoutput fuzzy controller is introduced in detail. The whole system is debugged andtested after completing software and hardware design of the welding power. Theresults make clear that this welding power can export prospective constant currentcharacteristic, and the inverter has excellent dynamic capabilities with fuzzycontroller.更多还原