基于DSP的斜特性式脉冲CO_2焊数字化电源

以数字信号处理器DSP为主控芯片,设计了一种斜特性式脉冲CO2焊数字化电源.采用新型的斜特性算法在焊接过程中自动调节电源外特性斜率,实现了电弧在大范围内的稳定性.设计方案采用了独立的送丝系统和全桥逆变主电路,选择了燃弧平均电压作为其它焊接参数控制的基准.充分利用了片内软硬件资源,产生一路控制信号并转换成双边沿脉冲输出,计算维弧所需要的外特性斜率,通过电弧电压自动调节,保持电弧稳定.系统硬件结构简单可靠,控制软件可通过仿真器并行接口更新算法.结果表明,该斜特性脉冲电源工作稳定,可靠性高.

DSP based digital pulsed CO2 welding power supply with sloping output characteristics

A digital pulsed CO₂ welding power supply with sloping output characteristics based on digital signal pro-cessing controller was developed.It can automatically regulate the slope of external characteristic curves with predominant slop-ing characteristic algorithm in the welding process,and imple-ment the stability of welding arc in wide field.In this system,the average arc voltage is preset in accordance with the feeding rate of a separate wire feeder,while full-bridge inverted main circuitry can be adopted independently.The digital pulse width modulation signals are generated directly at low hardware ex-pense,and the control strategy is implemented through software.Furthermore,the needed slope rate of output characteristics is calculated with the software,the control signal is created and converted to dual-edge pulse output signal,and the arc voltage is automatically adjusted to maintain a stable arc.The simplified configuration shows high reliability,and the control program can also be updated by means of the upgrade interface for property enhancement.Welding test showed that the pulsed power supply with the sloping output characteristics has high stability and reli-ability.