基于ARM的全数字多功能方波逆变焊机

研制了一种基于ARM(advanced RISC machines)全数字多功能方波逆变焊机,主电路采用双逆变结构,前级逆变电路选用全桥拓扑,后级逆变电路采用双半桥并联结构;以基于Cortex-M3内核的LM3S8971 ARM微处理器为核心,设计了焊接过程数字化控制系统;通过电流闭环控制和数字PID调节,实现前级逆变电路的恒流特性输出,同时对后级逆变电路进行数字化低频调制,获得多种电流波形输出;设计了基于ARM+CPLD双芯结构的数字化面板,实现了人机交互的数字化.结果表明,研制的多功能逆变焊机动态性能好、控制灵活、操作便利、设计合理可行.

Full digital multi-function square wave welding inverter based on ARM

A full digital multi-function square wave welding inverter based on ARM was developed. To achieve the efficient energy transformation,double inverter structure was adopted in the main circuit,while full-bridge inverter circuit topology was used in the primary inverter circuit,and the secondary inverter was with double parallel half-bridge inverter circuit structure. The LM3S8971 ARM microprocessor with Cortex-M3 kernel was used as the cybernetic core for the full-digital control system. Through the current closed-loop feedback control and digital PID regulation,the constant current output characteristic of the primary inverter circuit was obtained,while a variety of output current waveforms could be extracted through digital low frequency modulation for the secondary inverter circuit. A digital control panel with double-core structure based on ARM and CPLD was designed to realize the digitization of human-machine interaction. Both performance test and actual welding process test indicate that the developed welding inverter was with such advantages as perfect dynamic performance,flexible control,convenient operation, and reasonable and feasible design.