【作者】 林丽红；

【导师】 胡小建；

【作者基本信息】 合肥工业大学 ， 材料加工工程， 2008， 硕士

【摘要】 弧焊逆变电源的外特性形状不仅影响“电源—电弧”系统的稳定性,还关联着焊接工艺参数的稳定,只有为一定形状的电弧静特性选择适当形状的电源外特性,才能既满足系统的稳定条件又能保证焊接工艺参数稳定。本文讨论了三种典型的弧焊逆变电源外特性控制方式——模拟控制式、单片机控制式、DSP控制式,同过比较可知DSP控制技术是是实现数字化逆变焊机的关键。设计了逆变弧焊电源外特性系统的硬件电路,包括电弧电压、电流的反馈采样电路,DSP最小系统。根据手弧焊外特性控制特点对逆变电源采用PI控制策略,建立了控制系统的数字模型,并利用MATLAB的仿真模块对该系统进行仿真,以获得PI控制的最佳控制参数K_p、K_i。在外特性控制系统的软件设计方面,合理选择AD转换通道及转换启动信号,编制PI运算程序,并利用DSP的EPWM模块,得到两路脉宽相同,相位差180°的PWM波形来触发IGBT管导通。在试验方面,设计了基于SEED-DSK28016开发板、PC机、示波器及波形发生器的试验平台,验证了逆变电源外特性控制系统软件的可行性。更多还原

【Abstract】 The external characteristic shape of arc welding inverter not only influce the stability of "Power-Arc" system,but also be related to the steady of welding parameter,and only when we choose the proper external characteristic curve for a certain form of arc static character,that can ensure both the stable condition of system and the steady of welding parameter.This paper discusses three classic external characteristic control modes of arcwelding inverter------analogous control.MCU control,DSP control,and we can drivea conclusion that the DSP control mode is the key element to realize the digitalization of arc welding inverter.The hardware circuit of arc welding inverter control system has been designed,including the feedback and sample circuit of arc power voltage and current,and DSP minimum system.According to the external character control,we accept PI algorithm as the control strategy,and after establishing the system’s controlling model,the simulation of control system has been carried out on Matlab,and the PI’s ideal parameters K_p、K_i have been worked out.The system’s software includes the A/D conversion program,PID calculation , generating program of PWM signal .At last,we design a experiment flatform,which is based on PC,oscilloscope , waveform generator,SEED-DSK28016.The experiment proves the feasibility of control software system of arc welding inverter.更多还原