变极性钨极氩弧焊电源主电路设计

Research on main circuit of the variable polarity inverter TIG welding supply

设计的变极性钨极氩弧焊电源主电路采用输出功率较大的全桥式双逆变结构,选取绝缘栅极型晶体管IGBT为主控开关功率转换器件。对主电路组成部分涉及的元件进行了选取,并对二次逆变电路的工作过程进行了分析。对一次逆变部分的外特性进行了测试,并对实际焊接过程中的波形进行了测试分析。结果表明:该电源可获得电流频率、占空比、正负半波幅值均可独立调节的变极性波形,能够正常工作,该研究具有一定的实际应用价值。

Full-bridge dual inverter structure was used in the main circuit in this paper.IGBT was chosen as switch component to perform energy transfer and power conversion.Each part of the elements involved in the main circuit was designed and selected.The working process of the second inverter circuit was also analyzed.The outer characteristic of the first inverter circuit was measured,and the welding waveforms were tested and analyzed.The results show that following parameters of the power supply can be adjusted separately including the output current frequency,duty cycle and current amplitude.The power supply worked effectively,and the study on main circuit of the variable polarity inverter TIG welding supply has some degree applied values.