共查询到19条相似文献,搜索用时 62 毫秒
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介绍了国内外数字化弧焊逆变电源的研究现状;讨论了典型逆变电路模型和软开关技术;概括了功率开关器件IGBT在逆变电源中的应用,以及数字信号处理(DSP)的发展对弧焊电源控制系统的作用;分析了数字化弧焊逆变电源对满足高质量焊接要求的重要意义;总结了数字化弧焊逆变电源以后待解决的几个问题。 相似文献
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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. 相似文献
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A digital control of pulsed gas metal arc welding inverter was proposed. A control system consisting of analogue parts was replaced with a new digital control implemented in a TMS320LF2407A DSP chip. The design and constructional features of the whole digital control were presented. The resources of the DSP chip were efficiently utilized and the circuits are very concise, which can enhance the stability and reliability of welding inverter. Experimental results demonstrate that the developed digital control has the ability to accomplish the excellent pulsed gas metal arc welding process and the merits of the developed digital control are stable welding process, little spatter and perfect weld appearance. 相似文献
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针对降低CO2逆变焊机的开关损耗、输出电压纹波以及数字化控制等问题,分析了一种在直流母线回路增加两只功率开关器件的半桥DC-DC变换器软开关工作机理.基于先进精简指令微处理器(advanced RISC machines,简称ARM)设计具有电流和电压双闭环控制策略的全数字化CO2逆变焊机.在Matlab/Simulink环境下,对新型半桥DC-DC变换器的软开关工作过程进行仿真分析.结果表明,与传统模拟控制的半桥逆变焊机相比,这种ARM控制的新型半桥软开关逆变焊机具有开关损耗低、电压纹波小、编程灵活、稳定性好等优点. 相似文献
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SiC功率器件具备开关速度快、开关损耗低、导通损耗小等优点,有利于进一步提升焊接电源的逆变频率、响应速度,实现电弧能量的精密化控制. 设计了一套脉冲变极性逆变焊接电源,主电路采用双逆变结构,前级高频逆变电路采用SiC模块,后级低频调制逆变电路采用绝缘栅双极型晶体管 IGBT模块;设计了SiC模块驱动电路,实现了快速短路保护及米勒钳位;设计了基于ARM的全数字化控制系统,实现了PWM (pulse width modulation)以及输出电流波形的数字化控制.研制的脉冲变极性焊接电源逆变频率达到100 kHz,额定输出电流为500 A,可实现规整的脉冲变极性波形输出.结果表明,研制的基于SiC模块的脉冲变极性焊接电源能够实现稳定的焊接流程,可通过波形参数的调整有效控制焊接热输入量,获得良好的镁合金焊缝成形. 相似文献
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A digital controlled alternating electromagnetic stirring generator based on dual inverter structure 下载免费PDF全文
A digital controlled alternating electromagnetic stirring generator is proposed in this paper. The main circuit of the generator makes use of dual inverter structure among which the former inverter uses full bridge zero voltage switching topology and the latter inverter uses full bridge inverter circuit. To improve the dynamic response performance, the inverting frequency of the former inverter is as high as 100kHz. The Cortex-M3 kernel based ARM microcontroller LM3S818 is adopted as the cybernetics core of the digital control system to achieve accurate, stable and flexible control of the generator. All the PWM signals for the former and latter inverters are generated by the LM3S818 directly. The constant current characteristic of the former inverter is obtained through current close-loop feedback control, and can ensure the operation safety when the output current waveform is at zero crossing point. Both simulation and experiment results show that the proposed generator is with such advantages as wide soft-switching range, perfect control accuracy and flexible waveform modulation, and can fulfill the requirements of electromagnetic stirring process. 相似文献
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全数字机器人VPPA焊接电源 总被引:2,自引:1,他引:1
为提高铝合金机器人VPPA(变极性等离子弧)焊接过程的稳定性,研制了一台600 A级基于ARM(advanced RISC machines)的全数字机器人VPPA焊接电源.主电路采用双逆变拓扑结构,初级逆变电路采用全桥拓扑,次级逆变电路采用双半桥并联拓扑;以基于Cortex-M4内核的STM32F405RGT6 ARM微处理器为主控芯片,植入FreeRTOS嵌入式实时操作系统,设计了机器人VPPA焊接过程数字化控制系统;采用自适应模糊免疫PID控制算法实现电流闭环控制,获得了稳定的电流输出波形;设计了基于ARM的数字面板,实现了人机交互的数字化.结果表明,研制的机器人VPPA焊接电源动态调节性能优良,焊接过程稳定可靠,焊缝成形良好. 相似文献