摘要
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.
Si C-based power devices have the advantages of fast switching speed,low switching loss,and small conduction loss,which are conducive to further improving the inverter frequency and response speed of the welding power supply,achieving precise control of arc energy.A set of pulsed variable polarity inverter welding power supply is designed.The main circuit adopts a dual inverter structure.The frontstage high-frequency inverter circuit adopts Si C-based power modules,and the latter-stage low-frequency inverter circuit adopts IGBT modules.The Si C-based module driving circuit is designed,and fast short-circuit protection and miller clamp are realized.A full digital control system based on ARM(advanced RISC machines)is designed,and the digital control of PWM and output current waveform is realized.The developed pulsed variable polarity welding power supply has an inverter frequency of 100 kHz and a rated output current of 500 A,which can achieve a regular current output of pulsed variable polarity waveform.The results show that the developed pulsed variable polarity inverter welding power supply can achieve a stable welding process,and can effectively control the welding heat input through the adjustment of waveform parameters to obtain an excellent magnesium alloy weld formation.
作者
饶杰
吴健文
江东航
唐嘉健
王振民
RAO Jie;WU Jianwen;JIANG Donghang;TANG Jiajian;WANG Zhenmin(South China University of Technology,Guangzhou,510640,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2021年第7期21-27,I0002,I0003,共9页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51875212)
广东省科技计划项目(2018A030313192,2019B090919002)
广州市国际合作项目(201807010035,2019070110006)。
关键词
SiC功率器件
脉冲变极性焊接
高频逆变
数字化焊接电源
SiC-based power device
pulsed variable polarity welding
high-frequency inverter circuit
digital welding power supply
