数字脉冲MIG弧焊电源的设计  

Design of digital control pulsed MIG arc welding power source

作　　者：庞清乐[1,2] 

机构地区：[1]山东工商学院信息与电子工程学院,山东烟台264005 [2]聊城大学计算机学院,山东聊城252059

出　　处：《焊接学报》2010年第8期53-56,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50777040);中国博士后科学基金资助项目(20090461204);山东省博士后创新资助项目(200903066)

摘　　要：针对模拟控制和单片机控制的脉冲MIG弧焊电源控制系统灵活性差、控制精度低和可靠性差等缺点,设计了基于DSC和MCU的数字控制系统,并介绍了系统的硬件电路设计和软件流程.由DSC采用变参数PI控制方法实现电弧电压和焊接电流的闭环控制,PI控制的参数由MCU中的专家系统确定.在MCU上,对嵌入式操作系统μC/OS-Ⅱ的内核进行了裁减和移植,并设计了包括专家系统在内的多个任务.结果表明,基于DSC和MCU的脉冲MIG焊接电源控制系统动态响应快、可靠性高、弧长控制稳定.Aiming at some of deficiencies in the control system with analogous control technology and single-chip control technology, such as poor flexibility, control precision and reliability, a control system based on a digital signal controller (DSC) and micro control unit (MCU) for pulsed metal inert gas (MIG) arc welding power source is designed, and the hardware circuit and software flow chart of the system are presented. In the system, DSC with the variable parameter PI control algorithm controls the arc voltage and welding current, and the parameters of PI controller are determined by an expert system in MCU. The real-time kernel of the μC/OS-Ⅱis reduced and ported in MCU, and multiple tasks including an expert system are designed. The experimental results show that the control system based on DSC and MCU for pulsed MIG arc welding power source has the advantages of quicker response, better reliability and more stable arc length.

关 键 词：脉冲熔化极惰性气体保护焊 数字信号控制器 微控制器 比例积分微分控制 

分 类 号：TG434.5[金属学及工艺—焊接]